The invention discloses a permanent magnet type air pump, relates to low-pressure air compression equipment and belongs to a double-cylinder or double-membrane single-phase alternating-current full wave air pump. Driving power of the permanent magnet type air pump is produced through combined action of a magnetic field of a permanent magnet and an electromagnetic field. The two sides of a driving shaft 6 of the permanent magnet type air pump are provided with two permanent magnets 10 correspondingly, the middle of the driving shaft 6 is provided with a coil 4 and a hollow iron core 5 which are fixed to a pump body 3, and the driving shaft 6 can freely move in the hollow iron core 5 in the axial direction. When the coil 4 is connected to a single-phase alternating-current power source, an alternating magnetic pole is produced on the side, facing the permanent magnet, of the iron core 5, and the sides, facing the iron core 5, of magnetic poles of the two magnets on the driving shaft are the same in polarity (N pole or S pole). Due to the fact that the driving shaft 6 does straight reciprocating motion under the effect of attraction and repulsion of the electromagnetic field and the permanent magnet field, two pistons or membranes are driven to achieve air pump suction and compression stroke. Due to the fact that only attraction of the electromagnetic field is used as driving force of the electromagnetic type air pump, the permanent magnet type air pump has the good energy saving effect.

Permanent magnet type air pump

The invention provides a linear motor and a stroke calculating method thereof. The stroke calculating method of the linear motor comprises that an applied voltage of the linear motor, a current of a coil and an inductance of the coil are obtained; the present magnetic-core temperature of the coil is obtained, and a correction motor coefficient and a correction resistance of the coil are determinedaccording to the present magnetic-core temperature; and the stroke X of the linear motor is calculated according to the formula that X=1/alpha sum(U-RI-L*dI/dt)dt in which U represents the applied voltage of the linear motor, I represents the current of the coil, L represents the inductance of the coil, alpha represents the correction motor coefficient of the linear motor, and R represents the correction resistance of the coil. According to schemes of the invention, the present magnetic-core temperature of the coil is obtained by software function development, complex sensors or other structures are not arranged additionally, the cost of the linear motor is reduced effectively, the motor coefficient and the magnetic-core resistance are corrected timely according to the present magnetic-core temperature of the coil, and the stroke calculating accuracy and the working reliability of the linear motor are improved.

Linear motor and stock calculating method thereof

The invention provides a stroke estimation method and device for a linear compressor. The linear compressor comprises a linear motor. The linear motor comprises a coil used for driving a rotor to movelinearly. The stroke estimation method for the linear compressor comprises the following steps that the counter electromotive force of the coil is obtained when the rotor moves to the reversed maximum stroke position from the forward maximum stroke position, and a characteristic value of the counter electromotive force is generated; and when it is determined that the characteristic value is smaller than a preset value, the power of the linear motor is increased, otherwise, the power of the linear motor is decreased, and thus, the stroke of the linear compressor can be accurately controlled.

Stroke estimation method and device for linear compressor

The embodiment of the invention discloses a method for acquiring static impedance of a motor. The method comprises the following steps: acquiring target voltage and target current of a target frame, and calculating target impedance of the target frame according to the target voltage and the target current; when the target frame is not the initial frame, calculating the real-time static impedance of the motor in the target frame according to the target impedance and the bias resistance, and obtaining the bias resistance according to the static resistance of the motor and the initial impedance of the motor. The invention also discloses a motor monitoring system, equipment and a medium. According to the invention, the accuracy of the obtained real-time static impedance can be effectively improved.

Method for obtaining static impedance of motor, motor monitoring system, equipment and medium

A stroke estimation method for a linear compressor. The linear compressor comprises a linear motor. The linear motor comprises a coil used for driving a rotor (3) to move linearly. The method comprises the following steps: obtaining counter electromotive force of a coil when the rotor (3) moves to the reversed maximum stroke position from the forward maximum stroke position, and generating a characteristic value of the counter electromotive force; and when the characteristic value is determined to be smaller than a preset value, increasing the power of the linear motor, otherwise, reducing the power of the linear motor, so that the stroke of the linear compressor can be accurately controlled. A stroke estimation apparatus for a linear compressor, a linear compressor having the stroke estimation apparatus, and a refrigerator having the linear compressor.

Stroke estimation method and apparatus for linear compressor

The invention discloses an anti-collision travel control method of a reciprocating type compressor, the reciprocating type compressor and a refrigerator. The anti-collision travel control method of the reciprocating type compressor comprises the following steps that (1) the counter electromotive force sensed by a coil is collected; (2) zero-cross detection is conducted on the counter electromotiveforce; and (3) secondary derivation is conducted on a counter electromotive force curve, a secondary derivation value is obtained, and when it is judged that a piston operates to an upper stop point,the absolute value of the current secondary derivation value is compared with a threshold value t1. According to the anti-collision travel control method of the reciprocating type compressor, the cost and space of installing a displacement sensor and other detection devices at present are saved; the position of the compressor is judged through software according to the high-low level generated bya zero cross circuit, and it is avoided that the piston collides with an exhaust valve plate.

Anti-collision travel control method of reciprocating type compressor, reciprocating type compressor and refrigerator

The invention discloses a compressor and refrigeration equipment and belongs to the technical field of compressors The compressor comprises a compressor body The compressor body is internally provided with a cylinder, a piston mechanism arranged in the cylinder and an oil storage part The oil storage part is used for storing lubricating fluid The inner wall of the cylinder is provided with anoil storage groove An elastic deformation oil suction valve plate is arranged in the first oil storage groove The compressor body is further provided with an oil suction pipe The oil suction end ofthe oil suction pipe communicates with the oil storage part The oil discharge end of the oil suction pipe communicates with the first oil storage groove The oil suction pipe is controlled to communicate or be blocked through elastic deformation of the oil suction valve plate According to the compressor provided by the invention, the inner wall of the cylinder is provided with the oil storage groove and the oil suction pipe communicating with the oil storage groove so that the compressor can automatically extract the lubricating fluid to lubricate the piston mechanism through negative pressure generated by reciprocating motion of the compressor during operation and can automatically implement automatic oil supply operation without an extra oil pump device, the internal structure of thecompressor is simplified, and the operation stability of the compressor is improved

Compressor and refrigeration equipment

The invention discloses a compressor and a refrigerating device and belongs to the technical field of compressors. The compressor comprises a compressor body. An air cylinder, a piston mechanism arranged in the air cylinder and an oil storage part are arranged in the compressor body. The piston mechanism comprises a piston head and a piston rod. The oil storage part is used for storing lubricatingfluid. A first oil storage groove is formed in the outer wall of the piston rod. The compressor body is further provided with an oil suction pipeline. The oil suction end of the oil suction pipelinecommunicates with the oil storage part. The oil discharging end of the oil suction pipeline communicates with the inner wall of the air cylinder. When the piston mechanism conducts reciprocating compression motion in the axial direction of the air cylinder, the oil discharging end of the oil suction pipeline and the first oil storage groove can be switched between a communication state and a separation state. By means of the compressor, due to the oil storage groove of the piston mechanism and the oil suction pipeline communicating with the oil storage groove, the compressor can utilize negative pressure generated during the reciprocating motion of the compressor to automatically extract the lubricating liquid to lubricate the piston mechanism during running, the internal structure of thecompressor is simplified, and running stability of the compressor is improved.

Compressor and refrigerating device

The invention discloses a refrigerator comprising a refrigerator body and a door body arranged on the refrigerator body in an open-close mode, and a sterilization method thereof. The refrigerator further comprises a control module, an ice making module and a sterilization module. The control module can adjust the working state of the refrigerator; the ice making module is used for freezing liquid water into ice cakes to be stored and comprises an ice outlet which communicates with the outside space and can allow the ice cakes and/or ice water to flow out; and the sterilization module is arranged close to the ice outlet and can sterilize and disinfect the ice outlet. The sterilization module sterilizes and disinfects the ice outlet so that bacteria and insects which are attached to the ice outlet can be killed, and moisture at the ice outlet can be dried while the sterilization and insect killing effects are achieved; and the ice outlet is kept in a dry environment for a long term, breeding of the bacteria and the insects is restrained, and the residual moisture can be also prevented from absorbing impurities and harmful substances in air, so that it is beneficial for human health.

Refrigerator and sterilization method thereof

The invention provides a linear compressor and a position detection method The linear compressor comprises a shell, a piston and an air cylinder, wherein the piston and the air cylinder are arranged in the shell The piston is arranged in the air cylinder in a sliding manner An exhaust valve and an air cylinder cover are arranged on the air cylinder The linear compressor further comprises a position detection assembly The position detection assembly comprises a detection magnetic body and detection coils The detection magnetic body is fixed to the exhaust valve The detection coils are arranged on the air cylinder cover The detection magnetic body and the detection coils are arranged oppositely In the reciprocating motion process of the piston, the distances of the piston close to the exhaust valve are different, impacting force of different degrees is generated to the exhaust valve, and therefore the opening degrees of the exhaust valve are different; the distance between the detection magnetic body and the detection coils is changed, and therefore induced electromotive force values generated by the detection coils are different; and according to the induced electromotive force values generated by the detection coils, displacement of the piston can be calculated, position detection accuracy of the linear compressor is improved, and use reliability is improved

Wu Yuangang

Papers

Anti-collision travel control method of reciprocating type compressor, reciprocating type compressor and refrigerator

Compressor and refrigeration equipment

Compressor and refrigerating device

Refrigerator and sterilization method thereof

Linear compressor and position detection method