Showing papers on "Bimetal published in 1997"

Die shape optimal design in bimetal extrusion by the finite element method

Abstract: A new approach to die shape optimal design in bimetal extrusion of rods is presented. In this approach, the design problem is formulated as a constrained optimization problem incorporated with the finite element model, and optimization of the die shape is conducted on the basis of the design sensitivities. The approach is applied to the determination of the optimal die shapes for several combinations of the core and sleeve materials.

Thermal protector with bimetal plate

Abstract: A thermal protector having a fixed plate with a fixed contact point at one end, a movable plate having a movable contact point at a position corresponding to the fixed contact point. A bimetal plate which bends when a temperature exceeds a specified level deforms movable plate so as separate the contacts. There are first and second terminals connecting the fixed and movable plates with an external circuit and a heating element connected to the first and second terminals to maintain an open-circuited state. The heating element is flexible and is arranged so as to be deformed following the deformation of the bimetal plate and to always physically contact always with the bimetal plate.

Battery charger for battery packs

Abstract: A protection arrangement for a battery charger of the type used to charge battery packs used for electromotive tools. A self-holding protector is arranged in the neighborhood of an inserting hole of the battery charger for receiving a storage battery pack 50 to be charged. This self-holding protector element includes two elements electrically connected in parallel. One of these two elements is a bimetal which opens when it heats or flows too much current. The other of the two elements is a positive characteristic thermistor (PCT) which generates heat when a current flows through it. When a battery pack being charged becomes over-charged and heats, the bimetal element of the protector opens, and charging current stops flowing. When the bimetal element opens, electric current flows through the PCT. This current causes the PCT to heat and maintain the bimetal element in its open condition. When the battery pack being charged short-circuits, and a large current flows through it, the bimetal element opens and charging current is interrupted in the same way.

Foil type gas bearing

Abstract: PURPOSE: To control tension of a foil by fixing a foil applied with an initial tension while supporting at the opposite ends of an arcuate bimetal and providing the foil with a strain gauge for measuring the tension being applied to the rotary shaft thereby varying the set value of a variable power supply for heater automatically. CONSTITUTION: Tension of a foil 1 is measured by means of a strain gauge 3 and a measurement is delivered through an amplifier 4 to an automatic controller 5. When the measurement has abnormal value, current from a variable power supply 6 is increased and a planar bimetal 8 is heated by means of a heater 7 thus bending the bimetal 8 to project outward. Consequently, arcuate bimetal 9 secured to the planar bimetal 8 and the foil 1 are retracted in the radial direction thus controlling the tension within a correct range. Furthermore, a rotating machine is provided with a vibrometer 10 in order to determine the magnitude of vibration. When the vibration deviates from a set range, a heater 11 is heated through the automatic controller 5 to decrease the radius of curvature of arcuate bimetal 9 and to increase the lap angle θ thus controlling the tension of foil 1 and the lap angle θ constantly within a correct range.

Thermostat switch with a bimetal switch device

Abstract: The switch has a bimetal switch mechanism (12) which is arranged in a housing (11) with a first housing part (14) of insulating material and a second housing part (17). The bimetal switch mechanism is connected to a first electrode (16) coming out from the first housing part (14). The first electrode (16) cooperates with a second electrode (19) which is provided on the inside of the other housing part (17). The bimetal switch mechanism has a spring part (23) which works against a bimetal plate (29). The spring part carries a movable contact (28) which cooperates with the second electrode. A holder extension (25) is provided on the side of the spring part (23). The first electrode (16) is fastened to the holder extension (25).

Wire for silver-tin oxide or indium oxide electric contact and producing method thereof

Abstract: An Ag-SnO-In2O3 wire material used for electric contact contains such components (Wt%) as Sn (3-9), In (1.5-6), Ni (0.1-0.5), Zn (0.1-0.5)and Ag (the rest), and is made up through smelting Ag ingot, Sn, Ni, Zn and In, casting ingots, crushihng, high-temp high-pressure oxidation, crushing, press shaping, high-temp extruding to obtain strips or bands, and hot drawing. Said wire material has good machining preformance and can be used to make compound bimetal rivet to replace Agcdo contact in high-power relay. The Agcdo contact can pollute environment

Radiant heating element for a cooking area

Abstract: In a radiant heating body for a cooking location, in particular in the case of a glass ceramic plate (4), an insulating bottom (2) with an insulating annular rim portion (3) is provided in a pot member (1). A heating element (6) is arranged in an air space (5) above the insulating bottom (2). A safety temperature limiter is provided on the pot member (1). In order to achieve a low degree of switching hysteresis and to avoid an expansion bar regulator, the safety temperature limiter is in the form of a bimetal switch component (8) having a housing (9) which is fixed to the pot member (1) and in which a bimetal element (11) is disposed at the side: towards the air space (5). Provided at the annular rim portion (3) is an opening (20, 24) through which the bimetal element (11) is thermally coupled directly or indirectly to the air space (5).

Temperature-controlling switch

Abstract: The utility model relates to an electric appliance switch which is controlled by the water temperature variation, particularly a temperature-controlling switch of an automotive radiator fan. The utility model comprises a case body, a bimetal piece 4, a dynamic piece 11 and a fixed seat 6 of a fixed piece 10, wherein, the bimetal piece 4 is arranged in the case body; the dynamic piece 11 is in driving connection with the bimetal piece; the fixed piece 10 is matched with the dynamic piece; a screw thread connecting structure and an adhesion positioning structure are arranged between the fixed seat and the case body; after the distance between a screw thread regulating dynamic piece and the bimetal piece reach the requirement, the screw thread regulating dynamic piece and the bimetal piece can be adhered and sealed. The temperature-controlling switch has stable control indexes and high using reliability.

Gas cooking stove

Abstract: PROBLEM TO BE SOLVED: To prevent a fire to be caused in cooling of Tempra or the like by connecting a bimetal switch, a thermocouple, and a safety valve in series with an electrical wire for constituting an electrically closed circuit, and at the same time by connecting one of the two poles of the bimetal switch and the other respectively to the electric wire directly and to the electric wire via a temperature fuse, for constituting the electrically closed circuit. SOLUTION: A temperature sensor uses a bimetal switch 7 where a heat- sensitive part is used universally, is inserted into a sensor body 8, and securely fixes the bimetal switch 7 by a fixing means 9. The bimetal switch 7, a thermocouple, and a safety valve being provided in a gas channel are connected in series by an electric wire 10 for constituting an electrically closed circuit, and at the same time one of the both poles 15 of the bimetal switch 7 and the other are connected to the electric wire 10 directly and to the electric wire 10 via a temperature fuse 21, respectively, for constituting the electrically closed circuit, thus preventing a fire to be caused in cooling of Tempra or the like without using a dry cell.

Molded electric apparatus

Abstract: PURPOSE: To obtain a molded electric apparatus in which highly accurate protective operation can be realized through a thermal protector by enhancing workability of assembling work. CONSTITUTION: The molded electric apparatus is provided with a thermal protector S comprising a bimetal contact encased in a tubular bottomed resin case. The thermal protector S is molded integrally while abutting the resin case against a coil 3 and the molding material touches the surface of resin case tightly.

Temperature sensor of oil-immersed transformer

Abstract: PURPOSE: To provide a temperature sensor capable of easily measuring the temperature of the outer side wall of an oil-immersed transformer CONSTITUTION: This temperature sensor of an oil-immersed transformer accommodates a plurality of bimetal system temperature sensor main bodies 1a, 1b, 1c in a cabinet 2 which detect different temperatures, and is equipped with a change-over switch which individually leads out each of the contact points of the bimetal system temperature sensors 1a, 1b, 1c and makes selective use in the outside possible The cabinet 2 is detachably installed on the outside wall of the oil-immersed transformer Thereby installation in the narrow space between radiation ribs is easily enabled, and exchange is facilitated

Abnormal temperature rising prevention device for fixing device

Abstract: PROBLEM TO BE SOLVED: To forcedly interrupt energizing of a heating roll when the temperature of the heating roll arranged in a fixing device rises to an abnormal temperature. SOLUTION: The heating roll 10 arranged in the fixing device is rotated in the direction of the arrow R, and a heating lamp 12 is disposed at the inside of the roll 10. The heating lamp 12 is connected to a controller 30 through circuits L1 and L2 , and is electrically heated. A bimetal 40 is attached on the outer peripheral surface of the heating roll 10 by a fixing part 42 and a switch 50 is provided opposed to the bimetal 40. When the temperature of the heating roll 10 rises to an abnormal temperature set, the bimetal 40 is thermally deformed and pushes the lever 52 of the switch 50, so that a contact 54 is opened and the circuit L2 for the heating lamp is opened.

Drive preventing device or radiator fan in noise measurement experiment

Abstract: PROBLEM TO BE SOLVED: To correctly and stably carry out the noise measuring experiment without troublesome works in a vehicle equipped with a radiator fan device having a fan clutch. SOLUTION: A drive preventing device is provided with a temperature sensor 6 to detect the atmospheric temperature, a temperature indicating monitor 7 to indicate the temperature detected by the temperature sensor 6, and a bimetal cooling device comprising a water tank 8, a nozzle 9 arranged opposite to the bimetal 3, a hose 10 to feed the water in the water tank 8 to the nozzle 9, and an electric water pump 11. In carrying out the indoor and outdoor noise measuring experiments, when the temperature indicated in the temperature indicating monitor 7 approaches the connection temperature of a fan clutch 5 of the bimetal 3, an operation switch 14 is turned ON, the electric water pump 11 is operated, the water in the water tank 8 is sprayed from the nozzle 9 to the bimetal 3 through the hose 10, the bimetal 3 is cooled therewith so that the temperature is dropped below the connection temperature of the fan clutch 5, and the disconnected condition of the radiator fan 2 from a rotary drive shaft 4 is kept to prevent the drive of the radiator fan 2.

Formation and Effects of Heat Treatment for Electroless CoFeB Films Deposited on Substrates of Amorphous NiSiB Alloy Ribbons.

Abstract: A bimetal, composed of an amorphous alloy ribbon with an electroless metallic film deposited on it, was investigated as a candidate for perpendicular magnetic recording materials. Electroless CoFeB films (the positive saturation magnetostriction (λs>0)) were formed on non-ferromagnetic amorphous NiSiB ribbons, and the characteristics of the bimetals were obtained. Perpendicular magnetization of the film layer was enhanced by heat treatment, during which compressive stresses may be induced into the layer by crystallization of the ribbon.

Bimetallic strip current temp. overheat protector

Abstract: The utility model relates to a bimetallic strip current temp overheat protector, belonging to the electrician technical field The bimetallic strip current temp overheat protector which is composed of a casing, a contact head, a contact piece, a bimetal piece, an insulating member, etc is mainly characterized in that the contact head is connected and fixed with one end of the bimetal piece, and the other end of the bimetal piece is connected and fixed with a supporting piece which is arranged in the insulating member; a technology hole which is used for connecting and fixing the bimetal piece and the supporting piece is arranged on the contact or the supporting piece The utility model has the advantage of relatively good current overload and temperature control protecting performance, and the utility model can be used for operating and protecting motors and electrical apparatus

Bimetal type thermometer

Abstract: PROBLEM TO BE SOLVED: To obtain a bimetal type thermometer which can be dismounted from a tank or the like in operating state of facility by constructing a temperature- sensitive tube provided with a fixing part at the base independently of a temperature indicating part integrally equiped with a rotary shaft and a helical bimetal and mounting them removably. SOLUTION: A temperature-sensitive tube 2 provided with a fixing part 6 at the base thereof is constructed independently of a temperature indicating part integrally equiped with a rotary shaft 5 and a helical bimetal 3 and they are mounted removably. The temperature-sensitive tube 2 is inserted into a tank 20 through a fixing hole 21 thereof and an externally threaded screw 19 is screwed airtightly into an internally threaded fixing screw 22. When it is required to remove a temperature indicating part 1, the bimetal 3, the rotary shaft 5, etc., for the purpose of repair or replacement, a nut with external thread 12 attached to the joint 10 is turned to be detached from the female screw of a temperature-sensitive tube 2 while keeping the temperature sensitive tube 2 attached to the tank 20. When the temperature-sensitive tube 2 is separate from the temperature indicating part 1 and the rotary shaft 5 is drawn out from the temperature-sensitive tube 2, they can be dismounted integrally.

Thermal protector and manufacture thereof

Abstract: PURPOSE: To provide a thermal protector eliminating an erroneous operation due to a strain even when it is integrally molded in a molded electric equipment CONSTITUTION: The thermal protector S is formed by sealing a bimetal 53 contact in a cylindrical resin case 50 with a bottom in such a manner that the case 50 is molded by resin material having a high thermal deformation temperature under a predetermined pressure

Stepless automatic temp. controller for electric blanket

Abstract: The utility model belongs to a stepless automatic temperature controlling device which is mainly used for the temperature control of an electric blanket. The utility model is characterized in that a bimetallic strip is made by combining and packing two metal strips with different expansion coefficient in a heat insulation layer, and an A strip with small expansion coefficient is positioned on the upper part of the B strip which is positioned on the lower part of the A strip; one end of the bimetal strip is connected with a moving contact through an insulating strip and the other end of the bimetal strip is fixed on an isolating pad; the outer part of the heat insulation layer is wound with an electric heating wire whose one end is connected with the moving contact through the insulating strip, and the other end of the electric heating wire is connected with the conducting wire of the electric blanket. The utility model has the advantages of simple structure, high safety and no affection of unstable voltage.

Device for suspending the shadow mask of a cathode ray display tube comprising a bimetal, and bimetal

Abstract: Device (8) for suspending the shadow mask (1) of a cathode ray display tube, of the type comprising a thermostatic bimetal (10) whose deflection between 60° C. and 130° C. is less than the deflection between 20° C. and 60° C. Bimetal whose deflection between 60° C. and 130° C. is less than its deflection between 20° C. and 60° C.

Investigation of the initiation of corrosion cracks in the cladding layer of a bimetal

Abstract: We describe a specially-designed installation for the corrosion testing of bimetals, study the effect of the state of the surface of the cladding layer of a bimetal on the initiation of corrosion cracks, investigate the influence of the disclocation structure on the processes of pitting and crack initiation, analyze distinctive features of the process of propagation of corrosion cracks in the cladding layer along the interface of the metals, and suggest a method for the protection of two-layer structures against corrosion cracking by polishing and etching with aqua regia.

Suspension device for a shadow maskof a display cathode ray tube using a bimetal

Abstract: A suspension device (8) for a CRT shadow mask (1) consists of a thermostatic bimetallic strip (10) exhibiting a deflection at 60-130 degrees C which is less than (preferably less than 0.8, especially less than 0.65 times) that at 20-60 degrees C. Also claimed is a bimetallic strip exhibiting a deflection at 60-130 degrees C which is less than that at 20-60 degrees C and which preferably consists of an austenitic stainless steel and an Fe-Ni alloy containing 27-32 wt.% Ni.