Showing papers on "Bell mouth published in 2018"

Jet fan apparatus for tunnel ventilation

Abstract: The present invention relates to a jet fan apparatus for performing ventilation at the inside of a tunnel, comprising: a main body (10) having an impeller (15) capable of performing rotation and reverse rotation; a first noise portion (20) connected to one side of the main body (10), and having a first bell mouth (25) at an end portion thereof; and a second noise portion (30) connected to the other side of the main body (10), and having a second bell mouth (35) at an end portion thereof. Accordingly, a discharge wind speed related to the jet fan implementing discharge and prevention of pollutants at the inside of a tunnel or the like can be raised above a regulation speed such that the present invention is able to correspond to changes of usage environments and to a tendency of developing high quality devices.

Drop-proof plugged pipe connecting structure

Abstract: The invention relates to a drop-proof plugged pipe connecting structure. Both ends of the pipe body of a pipe fitting are provided with a bell mouth and a socket, and the inner wall of the bell mouthis provided with two sliding chutes in the axis direction of the pipe fitting; the inner wall of the bell mouth in the middle position of the sliding chutes are provided with a limit slot radially, and each sliding chute is divided into two parts by the limit slot; the limit slot penetrates the sliding chutes, and the outer wall of the socket is provided with two stop blocks matched with the sliding chutes; and the stop blocks can be clamped in the limit slot. According to the drop-proof plugged pipe connecting structure, when the pipe fittings are connected, the socket of one pipe fitting tobe connected is aligned to the bell mouth of the other pipe fitting to be connected, and the stop blocks on the socket are aligned to the sliding chutes on the bell mouth, and slid into the sliding chutes for connection; when the stop blocks reach the position of the limit slot, the two pipe fittings are rotated relatively, so that the stop blocks on the socket are clamped in the limit slot on thebell mouth, and then the connection of the two pipe fittings can be finished; and the connected pipe fittings have good drop-proof performance by virtue of the limit slot and the stop blocks.

Device to correct flow non-uniformity within a combustion system

Abstract: A combustor can include: a combustion chamber; a cap covering the combustion chamber; a first swirler inlet cup passing through the cap and having a first length and a first bell mouth; a second swirler inlet cup passing through the cap and having a second length and a second bell mouth; and a third swirler inlet cup passing through the cap and having a third length and a third bell mouth, wherein the first length is different from the third length, and wherein the first bell mouth is different from the third bell mouth. The first, second, and third swirler inlet cups can have different diameters, respectively.

Outdoor equipment of air conditioner

Abstract: PROBLEM TO BE SOLVED: To solve a problem that newly providing a fan for improving heat radiation performance of a heat sink in outdoor equipment of an air conditioner leads to problems of a space for installing the fan and cost increase of the product.SOLUTION: Outdoor equipment of an air conditioner has: a compressor which compresses a refrigerant to discharge the refrigerant; a heat exchanger which is connected with the compressor and conducts heat exchange with the compressed refrigerant; a blower which takes air from the outside into the inside and discharges the air to the outside or the upper side through the heat exchanger; a shroud having a bell mouth shape; and an electric component unit having a control board and an electric component casing having a heat sink which releases heat of electric components mounted on the circuit board. When viewed from above, the heat sink is disposed between an outer periphery of a portion where an opening area of the bell mouth shape of the shroud is wide and an inner periphery of a portion where the opening area is narrow.SELECTED DRAWING: Figure 2

Mould blows air impact head

Abstract: The utility model provides a mould blows air impact head, it relates to a machining equipment technical field. It contains upper punch, well drift, ring recess, low punch, bell mouth, through -hole, the upper punch below is provided with well drift, and well drift below is provided with the ring recess, and ring recess below is provided with the low punch, and the low punch lower extreme is provided with the bell mouth, and the through -hole runs through upper punch, well drift, ring recess, low punch, and the through -hole is connected with the bell mouth. After the technical solution is adopted, the utility model discloses beneficial effect does: simple structure, convenient operation, easy maintenance, practicality are strong, and use value is high, can increase the size in hole according to the size of diameter, has increased a bell mouth and has been used for store up existing gas volume, and the assurance has sufficient gas to part product and waste material.

Wire drawing annealing is with weathering wire passing device

Abstract: The utility model discloses a wire drawing annealing is with weathering wire passing device, its characterized in that: including the diaphragm, be equipped with line hole, fresh air inlet and wire guide mechanism on the diaphragm, wire guide mechanism install in it is downthehole to cross the line, it includes hole, lower hole and bell mouth to cross the line hole, the diameter of going up the hole is greater than the diameter in lower hole, go up the aperture the bell mouth with the hole links to each other down, the tip of fresh air inlet with the bottom inner edge department in hole is linked together down, wire guide mechanism includes hollow structure's wire column, wire column install in go up downtheholely, wire column's bottom is equipped with the cone, the top of cone is insertedand is located go up downtheholely, the bottom of cone is inserted and is located in the bell mouth, the bottom of cone with be equipped with vertical distance between the bottom of bell mouth, the outer fringe face of cone with be equipped with the clearance between the inner edge face of bell mouth The utility model provides high product weather the quality

Heat source unit and refrigeration cycle device

Abstract: This heat source unit is provided with an axial flow fan and a bell mouth surrounding the outer periphery of the axial flow fan. The bell mouth comprises a cylindrical straight pipe section, a suction section which is upstream of the straight pipe section and tapered expanding toward the upstream side, and a blowout section which is downstream of the straight pipe section and tapered expanding toward the downstream side. The suction section has at least one angle-reduction section that satisfies the formula θ0 > θi > 0 when the suction section of the bell mouth is viewed in a cross section taken in a direction parallel to the flow of air, where θ0 is the angle formed by "line L1, which is parallel to the axial direction of the axial flow fan at the position of the outer peripheral edge of the suction section where the diameter is largest," and "line L2, which is perpendicular to the axial direction of the axial flow fan in the connecting area between the suction section and the straight pipe section," and θi is the angle formed by "line L2" and "line L3, which connects the intersection P between line L1 and line L2 and a position of the outer peripheral edge of the suction section where the diameter is smaller than the largest diameter but larger than the smallest diameter."

Can blast proof metallic glass transformer

Abstract: The utility model discloses a can blast proof metallic glass transformer, tapered plug are arranged in the locating hole and its tip lies in one side that the bell mouth is close to to the tapered plug main aspects, and the tip diameter of tapered plug is greater than the miniport diameter of bell mouth, and the bottom plate is fixed on the big terminal surface of tapered plug Spring one end is fixed on the bottom plate, and the other end is fixed on locating hole port face, and the spring makes the axis of tapered plug and the dead in line of bell mouth The spine that is located under the main pressure release hole is fixed at the bottom plate, and rupture membrane is fixed to be set up in order to seal main pressure release hole in main pressure release hole When the spring was in thebiggest decrement, rupture membrane was punctureed to the spine During pressure lifting in the oil tank, pressure in the oil tank is through bell mouth, locating hole, inferior pressure release holepressure release outwards When pressure in the oil tank sharply rose, rupture membrane was punctureed to the spine, and most pressure in the oil tank is through bell mouth, locating hole, main pressure release hole pressure release fast outwards

Double suction type centrifugal fan

Abstract: PROBLEM TO BE SOLVED: To improve fan efficiency in a double suction type centrifugal fan in which a bell mouth is attached to each impeller.SOLUTION: A double suction type centrifugal fan includes: a first impeller (40) connected to a rotary shaft (33); a second impeller (50) which is formed with a second suction port (54) opening at an opposite side of an electric motor (31) and is connected to a position of the rotary shaft (33) that is spaced apart from the electric motor (31) further than the first impeller (40); a first bell mouth (60) connected to a first suction port (44) of the first impeller (40); and a second bell mouth (70) connected to the second suction port (54) of the second impeller (50). An axial length L2 of the second bell mouth (70) is larger than an axial length L1 of the first bell mouth (60).SELECTED DRAWING: Figure 6

Novel manometer damping structure

Abstract: The utility model relates to an attached device field of protection manometer, concretely relates to a to novel manometer damping structure. Including the damping tube, set up porose fender in the damping tube, the through -hole that the hole kept off is the bell mouth, the left hole diameter of bell mouth is less than the hole diameter on bell mouth right side, the right side that the hole kept off is provided with the baffle, on the plate washer threaded connection have with the pin of damping tube with the axle center, the left end of pin is the conical end that corresponds with the bell mouth, be provided with on the pin on conical end right side and keep off the ring, it is provided with two stoppers of calling according to the axial direction wire pair of pin to keep off the ring onthe terminal surface that the hole kept off, distance between two stoppers is greater than the internal diameter that the hole kept off, closing cap and damping tube right -hand member sealing connection, be provided with the manometer with the damping tube intercommunication on the damping tube between hole fender and the baffle. The utility model discloses, the damping is effectual, and it is easy to process moreover, install, and simple structure is with low costs.

Improved generation metallic glass transformer

Abstract: The utility model discloses an improved generation metallic glass transformer, tapered plug are arranged in the locating hole and its tip is located one side that the bell mouth is close to to the tapered plug main aspects, and the tip diameter of tapered plug is greater than the miniport diameter of bell mouth. It is first, two baffles respectively with mainly, the diameter phase -match in inferior pressure release hole, it is first, two baffles articulate main, on the inferior pressure release hole on the lateral wall of port, it is first, two dogs are fixed first, the owner of two baffles below, so that first on the lateral wall in inferior pressure release hole, two baffles are in perpendicularly main, the position of inferior pressure release hole axis, first spring both ends are fixed respectively on the lateral wall in the lower terminal surface of first baffle and main pressure release hole, the limiting plate is fixed on oil tank outer on the tank wall face so that the secondbaffle can be faced time pressure release hole foreign side and be less than 90 degrees to the pivoted angle aslope. This technical scheme can maintain the stability of oil tank internal pressure, canprevent the oil tank explosion, can prevent that the dust is in explosion -proof dustproof subassembly gets into the oil tank.

Blower device for vehicle air conditioning

Abstract: To prevent water from leaking to the outside even if the water accumulates in a lower layer air passage.SOLUTION: A motor 65 is attached to a bottom wall part 8a of a casing 8. In the casing 8, a lower layer scroll part 14 which houses a fan 50 for lower layer ventilation is provided so as to be spaced apart from the bottom wall part 8a in an upward direction. Further, a lower layer bell mouth formation member 60 forming a lower layer bell mouth port 61a communicating with the interior of the lower layer scroll part 14 is provided. The lower layer bell mouth formation member 60 is provided with a motor cover part 62 which covers the motor 65 from above.SELECTED DRAWING: Figure 8

Folding unmanned aerial vehicle VTOL frame

Abstract: The utility model relates to a folding unmanned aerial vehicle VTOL frame, connecting rod including the pipe structure, the both ends of connecting rod are fixed with the motor cabinet of installing the motor, vertical setting of motor and top are connected with the rotor, its characterized in that, the both ends of connecting rod still are equipped with and are located the inboard three -way pipethat just is the elasticity material of motor cabinet, vertical setting of three -way pipe and below are connected with the lower extreme and set up the landing leg that fills up the foot, the upperend of landing leg is provided with the upper end for the kicking block of conical column, the surface of connecting rod is equipped with two and lies in inside and the perpendicular bell mouth that sets up of circumference of three -way pipe, the conical column of kicking block stretches into in the bell mouth, the landing leg can extend by drop -down messenger's standpipe, and then makes the kicking block break away from vertical bell mouth then stretch into horizontal bell mouth, and the landing leg can rotate 90 degrees to be folded, and then conveniently carries at same horizontal plane,the flat packing box of can packing into with the connecting rod.

Face identification device convenient to installation

Abstract: The utility model discloses a face identification device convenient to installation, including shell, cassette and bottom plate, open at shell one side outer wall top has the bell mouth, and the bellmouth is located the intermediate position of shell length direction, the toper outer wall of bell mouth bonds and has the reflector, shell one side outer wall has the display screen through the boltfastening, and the display screen is located the bell mouth under, shell one side outer wall has two pivoted light filling boards through the bolt fastening, and two light filling boards are located the display screen both sides respectively. The utility model discloses make installation that the display screen can be convenient to the draw -in groove of cassette in, needn't reach this effect through the structure of complicacy, improved the convenience of device for the device can optionally be installed on the wall or be subaerial, and the arbitrary rotation of arbitrary flexible and the hinge of telescopic link makes installing at bottom surface or wall top that the device can set one's mind at rest, does not worry that it produces to shoot the not good situation of effect.

Efficient wind scooper

Abstract: The invention relates to an efficient wind scooper. The efficient wind scooper comprises an air guiding box and an air guiding ring, wherein an air collector in the shape of a bell mouth is added at the air inlet end of the wind scooper; and the diameter of the air collector at the air inlet end is large, then, the air collector is gradually decreased and is shrunk to the air guiding ring throughsmooth transition, and the bell mouth is formed. According to the efficient wind scooper, the air collector in the shape of a bell mouth is added at the air inlet end, so that cooling air flow is increased, and heat dissipation capability is high; and compared with ordinary ring type wind scoopers, the wind scooper with the air collector has the advantage that a flow field of cooling air at an inlet section of the wind scooper is much smoother, so that the wind scooper with the air collector is beneficial to reduction of airflow noise.

High-pressure dilute phase small material amount feeding apparatus and control method

Abstract: The invention discloses a high-pressure dilute phase small material amount feeding apparatus and a control method. The length of an air supply pipe extending into the bell mouth of the lifting sectionis adjusted by controlling the height of the lifting section, thereby adjusting the flow area of the feeding. The fluidized powder enters the lifting pipe through the bell mouth, and the feeding amount into the lifting pipe is controlled by adjusting the flow area between the air supply pipe and the bell mouth. The high-pressure gas enters the lifting pipe through the air supply pipe to ensure the stability of the conveyance, thereby realizing the dilute phase small material amount feeding of the high-pressure feeding and discharging type sending tank. According to the high-pressure dilute phase small material amount feeding apparatus, the feeding apparatus is simple in structure, safe and reliable, the feeding mass flow rate can be accurately and rapidly adjusted, and the material conveying discontinuity is effectively avoided. The high-pressure dilute phase small material amount feeding apparatus and control method can be widely applied to the fields of energy, chemical engineering,medicine, mining, food processing or the like.

Shock attenuation numerical control lathe

Abstract: The utility model provides a shock attenuation numerical control lathe, processingequipment, drive arrangement above includes the lathe bed and locates the lathe bed, the lathe bed bottom covers thereis the one deck rubber pad, the rubber pad bottom is equipped with a plurality of evenly distributed's bell mouth, install in the bell mouth rather than assorted conical part, be equipped with a plurality ofly in the rubber pad and the corresponding shock absorption space in bell mouth position, shock absorption space link up with the bell mouth mutually, install in the shock absorption space rather than the assorted gasbag, gasbag central point puts and is equipped with a through -hole, one end port that the through -hole is relative with the bell mouth be equipped with with conical part assorted guiding hole, the through -hole internal fixation has a spring, in the conical part head penetrated the spring, the conical part outer wall contacted with the spring. The utility model disclosesa shock attenuation numerical control lathe can be in when operation, carries out the buffering shock attenuation in the at utmost to the shaking force that transmits to the lathe bed on, avoids processingequipment to receive the influence, guarantees processingquality.

Centrifugal fan and ventilation fan

Abstract: A centrifugal fan includes: an impeller driven by a drive motor to rotate; a scroll casing including an inlet-port face having an opening and a wall portion having positions at which distances from an axis line that is a rotation center of the impeller differ from each other, and changing an air flow in a centrifugal direction generated by rotation of the impeller into an air flow in one direction; an air admitting portion including a bell mouth portion having a large-diameter side end placed on an inlet-air-flow upstream side of the inlet-port face; and a protruding portion extending from the air admitting portion in a direction orthogonal to the axis line, which is the rotation center of the impeller, and in a direction away from the rotation center and surrounding part of the bell mouth portion.

Improved cutting knife for plastic drainage plate

Abstract: The invention discloses an improved cutting knife for a plastic drainage plate, which is mainly used for cutting the plastic drainage plate in the field of hydraulic engineering, and is simple in structure and convenient to construct. The improved cutting knife consists of a circular truncated cone ring, an annular knife, a rope ring and a rope; the working principle is that the annular knife is screwed on the circular truncated cone ring, a bell mouth B is caused to be aligned with a bell mouth A, then the bell opening A of the circular truncated cone ring of the cutting knife is aligned withthe side surface of the plastic drainage plate, the side surface of the plastic drainage plate is pushed into the annular knife, after the plastic drainage plate enters the annular knife, the springof a fixing pin is bounced back, an arc stop lever closes the bell mouth B, then the annular knife is further rotated to stagger the bell mouth B from the bell mouth A, in this way, the side surface of the plastic drainage plate is staggered from the bell opening A of the circular truncated cone ring, a worker places the cutting knife down, the cutting knife is sunk to the sea bottom along the plastic drainage plate, the worker pulls the rope in an oblique upward manner, and the rope drives the circular truncated cone ring and the annular knife to cut off the plastic drainage plate on the seabottom.

Blower device, outdoor unit for air-conditioner, and refrigeration cycle device

Abstract: The blower device (10) comprises an impeller (11) and a bell mouth (12). The bell mouth (12) has a suction edge (121) and is disposed so as to surround the impeller (11). The diameter of the bell mouth (12) increases toward the suction edge (121). The suction edge (121) has first regions (121a) and second regions (121b) having a shorter radial distance from the rotation axis of the impeller (11) to the suction edge (121) than the first regions (121a). Multiple convex parts (P1) and multiple concave parts (P2) are formed in the second regions (121b).

Impeller for ventilation ducts

Abstract: FIELD: ventilation.SUBSTANCE: invention relates to an impeller for ventilation ducts formed by a centrifugal blower having a scroll housing (1) equipped with side air intake holes (2) and a bell mouth (3) for air outlet in a perpendicular direction, lines (4) connected to the side holes (2) extend into the common hole 5 for direct connection to the ventilation duct portion (6).EFFECT: improved indoor air quality.3 cl, 4 dwg

Pipe material connecting tool

Abstract: PROBLEM TO BE SOLVED: To provide a pipe material connecting tool capable of easily connecting and fixing a plurality of types of independent ring type corrugated pipe material to a through hole while maintaining high waterproofnessSOLUTION: A pipe material connecting tool 1 connects and fixes an independent ring type corrugated pipe material 3 to a through hole 61 formed in a wall 60 The pipe material connecting tool 1 includes a socket 10, a rotary lock body 30, and a bell mouth 40 The socket 10 is attached to the outer periphery of the corrugated pipe material 3, such that the movement in the direction of the axis O is restricted by the engagement of an engagement piece 19 When an insertion portion 42 of the bell mouth 40 is inserted into the pipe of the corrugated pipe material 3 from the distal end side, detachment of the bell mouth 40 from the corrugated pipe material 3 is regulated by the engagement of an engagement claw 44 When the rotary lock body 30 is screwed onto the outer periphery of the socket 10, the wall 60 around the through hole 61 is pinched by the rotary lock body 30 and a flange portion 46 of the bell mouth 40 As a result, the corrugated pipe material 3 is connected and fixed to the through hole 61SELECTED DRAWING: Figure 8

Blower and blowing system including the same

Abstract: The present invention relates to a blower and a blower system having the same. The blower according to one embodiment comprises: a bell mouth configured to suck ambient air through the front; an impeller inserted into the rear surface of the bell mouth to discharge the outside air sucked in the bell mouth to the outside; and a motor mounted on a central shaft of the impeller to transmit rotational force to the impeller. The motor is inserted into the rear surface of the impeller, one end of the motor is disposed in the impeller, and the other end of the motor is exposed to the outside from the rear surface of the impeller.

Rotary gliding arc plasma fuel oil splitting decomposition head of aero-engine combustor

Abstract: The invention provides a rotary gliding arc plasma fuel oil splitting decomposition head of an aero-engine combustor. The two end surfaces of a swirler are correspondingly connected with the front endand the rear end of an anode venturi-tube; a bell mouth mouting seat is matched with a supporting surface of the head of a combustor combustion liner of an engine; an outer layer bell mouth is mounted in a mounting groove of a bell mouth mouting seat and a cathode inner layer bell mouth is attached to the inner surface of the bell mouth mouting seat; the anode venturi-tube is located in the combustor combustion liner of the aero-engine; one end of a cable is mounted on the anode venturi-tube and the other end of the cable is connected with a power supply. The splitting decomposition head is capable of improving the uniformity that fuel is mixed with air and producing active particles capable of accelerating the combustion chemical reaction, so that the problems of low combustion efficiency, flameout caused by poor oil resources, ignition at high altitude and uneven temperature field of a combustor outlet port of the aero-engine under special conditions can be solved, and the splittingdecomposition head has the characteristics of being capable of splitting the fuel oil efficiently and producing a large amount of active particles, simple in structure and strong in versatility.

Centrifugal blower, air-conditioning device, and method for manufacturing centrifugal blower

Abstract: The centrifugal blower is provided with a turbo fan and a bell mouth. The bell mouth includes a flange section extending in an orthogonal direction to a rotational axis direction of the turbo fan and a cylindrical section extending from the flange section in the rotational axis direction, and the bell mouth further has a plurality of wall parts each formed so as to be connected to the flange part and the outer peripheral surface of the cylindrical part and stand upright. The plurality of wall parts includes a plurality of wall part groups, each comprising two or more wall parts extending in parallel with each other in an outward direction from the cylindrical section.

Vehicle air-conditioner blowing apparatus

Abstract: A motor 65 is attached to the bottom wall 8a of a casing 8. In the casing 8, a lower layer scroll part 14 for housing a lower layer blowing fan 50 is provided separate and upward from the bottom wall 8a. A lower layer bell mouth forming member 60 for forming a lower layer bell mouth 61a connected to the inside of the lower layer scroll part 14 is provided. In the lower layer bell mouth forming member 60, a motor cover 62 for covering the motor 65 from above is provided.

One-way tuyere for granary

Abstract: The invention discloses a one-way tuyere for a granary, and belongs to the technical field of granary tuyeres The one-way tuyere comprises a top plate and a hollow cylinder, a limiting ring is arranged on the inner wall of the hollow cylinder, a baffle is matched with the interior of the limiting ring, a small fan is installed inside the hollow cylinder, a guiding barrel column is fixed to the shell of the small fan, and an elastic member is fitted between the guiding barrel column and the baffle; a bell mouth is formed in one end of the hollow cylinder, the top plate is connected to the bellmouth through supporting columns, and the top plate comprises a first plate layer, a second plate layer and a semi-elliptical ball According to the one-way tuyere, the baffle is installed in the device and connected to the small fan installed in the hollow cylinder through a small spring, and the baffle is limited by the limiting ring, so that the air can only flow from inside to outside in onedirection

Air purifier and air conditioner

Abstract: Provided is an air purifier comprising: a housing; a blower provided within the housing; a bell mouth disposed on the suction side of the blower and having a bend which is bent axially from the peripheral edge of an air inlet; a front surface panel removably mounted to the front surface of the housing; a suction opening provided in at least one side surface section of both side surface sections of the front surface panel; and a filter which is mounted facing the suction opening and through which indoor air sucked in from the suction opening by the drive of the blower flows. The filter is mounted closer to the suction opening side than the start point of the bend of the bell mouth at a position away from the suction opening by 30 mm or more, and the filter is formed such that, when the filter is viewed from the side surface section side of the front surface panel, the filter has a greater width than the suction opening.

Noise-reduction bricks having bell mouth

Abstract: Noise-reduction bricks having a bell mouth, each brick comprising a brick body (1). One bottom surface of the brick body (1) is concave inward to form a bell shape; the thin end of a bell mouth (2) is connected to a sound absorption cavity (3); sound absorption cotton (4) is placed in the sound absorption cavity (3); and a reflection cover (5) is arranged at the bell mouth (2). Each brick is an independent noise-reduction unit, and the bricks are combined by means of bricklaying to build sound-absorbing wall surfaces or sound-absorbing buildings. The noise-reduction bricks having a bell mouth have a simple structure and good sound absorption and noise reduction effects.

Three-layer composite polypropylene high-temperature silence water drainage pipe bell-and-spigot type connecting technology

Abstract: The invention relates to the technical field of water drainage pipes, in particular to a three-layer composite polypropylene high-temperature silence water drainage pipe bell-and-spigot type connecting technology. S1, installing preparation is made; S2, water drainage pipe prefabricated machining is conducted, a hand saw or a cutter or a pipe cutting machine is adopted for cutting a water drainagepipe according to the needed length, a wood rasp or a manual grinding wheel is adopted for conducting chamfering grinding on a spigot of the water drainage pipe, the chamfering angle ranges from 15 degrees to 30 degrees, the thickness of a groove is about 1/2-2/3 of the thickness of the pipe wall, scraps are thoroughly removed after the slope is finished, and abrasive paper is used for grinding for smoothness; S3, dry cloth is used for wiping the inner side of a bell mouth and the outer side of the spigot cleanly, cleanliness is kept, and dust sand and water stains do not exist; S4, whether the bell mouth and the spigot are clean or not is checked; S5, a depth line is drawn on the spigot part, after a brush is used for brushing a lubricating agent with the width being 30 mm, the spigot isvertically inserted into an inner cavity of the bell mouth, and seaming, calking and fixing are conducted; and S6, installation is finished, and checking and accepting are conducted. According to thethree-layer composite polypropylene high-temperature silence water drainage pipe bell-and-spigot type connecting technology, bell-and-spigot type rubber ring seal flexible connection is adopted, mounting and dismounting are convenient, the water sealing performance is good, and the installing cost is reduced.