An external-rotor rotary compressor

Abstract

The present invention discloses an external rotor rotary compressor composed of a housing, a stator, a rotor, a cover plate, and a slider. In the chamber formed by the housing and the cover plate, the rotor and stator of the motor are arranged, wherein the motor is an external rotor type motor. By integrating the rotor with the piston of the compressor, the integration of the motor and the compressor is achieved, significantly reducing the volume and weight of the compressor. In addition, since the motor stator coil part is isolated from the compressed gas of the compressor, the combination points of the static and moving parts are reduced, avoiding the corrosion of the coil by the refrigeration gas and the pollution of the refrigeration gas by the motor lubricating oil, and improving the reliability and performance of the external rotor rotary compressor. Moreover, the present invention also has the characteristics of simple structure and easy processing.

Description

Technical Field

[0001] The present invention relates to the field of compressors, and more particularly to an external rotor rotary compressor. Background Art

[0002] Rotary compressors are new types of compressors. In these compressors, the motor does not need to convert the rotary motion of the rotor into the reciprocating motion of the piston. Instead, it directly drives the rotary piston to perform rotary motion to complete the compression of the refrigerant vapor. Its main advantages are as follows: Since the piston performs rotary motion, the compression work is smooth, stable, and balanced. It has the advantages of high compression efficiency, few components, small volume, light weight, good balance performance, low noise, complete protection measures, and low power consumption. In particular, the combination of an external rotor motor and a rotary compressor further compacts the structure of the rotary compressor and further improves the mechanical efficiency. For example, during the manufacture of refrigerators, since the refrigerator system has strict requirements for the design dimensions of the compressor, especially to ensure that its height meets the system design requirements. The working environment of the refrigerator compressor is indoors, so higher requirements are imposed on vibration and noise. At the same time, it also needs to be able to meet the changing refrigeration requirements of the refrigerator. By adopting an external rotor motor, the overall height of the vertical rotary compressor can be effectively reduced to meet the design requirements of the refrigerator system.

[0003] However, the designs of existing external rotor rotary compressors all adopt the method of segmental combination of the motor and the compressor. Due to the segmented arrangement of the power part and the compression part in this type of compressor, the volume and weight of the compressor increase, making its body relatively bulky when applied to household appliances such as refrigerators and air conditioners. It also occupies the limited space of the appliance. Summary of the Invention

[0004] Aiming at the technical defects existing in the existing external rotor rotary compressor, the purpose of the present invention is to provide a new design of an external rotor rotary compressor to solve the technical problems existing in the prior art and ensure the performance of the external rotor rotary compressor.

[0005] The present invention is achieved in the following manner: An external rotor rotary compressor is composed of a housing, a stator, a rotor, end covers, and a slider. End covers are provided at both ends of the housing, and the housing has a chamber inside. The stator is fixed in the chamber, and the stator is fixed at the axis of the end cover. A stator coil is wound on the stator. The rotor is rotatably sleeved outside the stator, and a magnet is embedded on the inner side of the rotor facing the stator. The end covers seal the stator and the rotor inside the housing. It is characterized in that: The axis of the rotor is eccentrically designed, and its long axis end is tangent to the inner wall of the housing chamber. A slider groove is provided on the circumferential wall of the housing, and a slider is arranged therein. The slider can move radially in the slider groove. One end of the slider is connected to the bottom of the slider groove through a return spring, and the other end is tangent to the circumferential wall of the external rotor. The slider spring is enclosed in the slider groove by a slider groove cover; Rotor side wings are further provided at both ends of the rotor. The rotor side wings are fixedly installed on both sides of the rotor and are coaxial with the housing. The outer edge of the rotor side wings is in clearance fit with the inner wall of the housing.

[0006] Furthermore: The axis of the stator is a hollow shaft, and the wiring of the coil winding on the stator is led out of the housing through the hollow shaft.

[0007] Furthermore: A semi-circular cavity is further provided on the rotor.

[0008] Furthermore: A semi-circular cavity having the same shape as the rotor is further provided on the rotor side wings.

[0009] In the external rotor rotary compressor of the present invention, by integrating the rotor and the piston of the compressor, the integration of the motor and the compressor is achieved, and the volume and weight of the compressor are significantly reduced. In addition, since the motor stator coil part is isolated from the compressed gas of the compressor, the corrosion of the coil by the refrigeration gas and the pollution of the refrigeration gas by the motor lubricating oil are avoided, and the reliability and performance of the external rotor rotary compressor are improved.

[0010] Moreover, the present invention also has the characteristics of simple structure and easy processing.

[0011] The following further describes the present invention in detail with reference to the accompanying drawings. Description of the Drawings

[0012] Figure 1 、Schematic diagram of the external structure of the present invention;

[0013] Figure 2 、Schematic cross-sectional structure diagram of the first embodiment of the present invention;

[0014] Figure 3 、Schematic structure diagram of the stator in the embodiment of the present invention;

[0015] Figure 4, Structural sectional view of the radial plane of the second embodiment of the present invention;

[0016] Figure 5 , Schematic diagram of the outer rotor structure in the second embodiment of the present invention;

[0017] Figure 6 , Schematic diagram of the rotor side wing plate structure in the second embodiment of the present invention.

[0018] In the figure: 1, housing; 2, end cover; 3, stator shaft cap; 4, socket; 5, intake pipe; 6, exhaust pipe; 7, slider groove cover; 8, outer rotor; 9, stator; 10, stator shaft; 11, wire; 12, slider; 13, slider spring; 14, wire hole; 15, rotor side wing plate; 16, permanent magnet; 17, semi-circular cavity a; 18, semi-circular cavity b. Detailed implementation manner

[0019] Embodiment 1: As Figure 1 , 2 shown, an outer rotor 8 rotary compressor is composed of components such as a housing 1, a stator 9, a rotor, a cover plate, a slider 12, etc. Among them, the housing 1 is cylindrical, and cover plates are provided at both ends of the housing 1. A chamber is formed inside the housing 1, and the motor and compressor components included in the rotary compressor are all arranged in the chamber. An intake pipe 5 and an exhaust pipe 6 are provided on the side wall of the cylindrical housing 1. A slider 12 groove is provided in the middle of the two pipes, and a slider 12 is installed inside. The slider 12 is in clearance fit with the slider 12 groove, so that the slider 12 can slide in the slider 12 groove. The lengths of the slider 12 and the slider 12 groove are equal to the thickness of the outer rotor 8.

[0020] The slider 12 is a rectangular cuboid, its transverse end is embedded in the slider 12 groove, one end of the slider 12 is connected to the bottom of the slider 12 groove through a slider spring 13, and the other end is tangent to the circumferential wall of the outer rotor 8. It is kept in a state of always being tangent to the outer circumferential wall of the outer rotor 8 by the force of the slider spring 13.

[0021] A slider groove cover 7 is provided at the outer end of the slider 12 groove, and thus the slider spring 13 is enclosed in the slider 12 groove by the slider groove cover 7.

[0022] The motor is an outer rotor type motor, that is, the cooperation mode between the stator 9 of the motor and the rotor is opposite to that of a conventional motor. The central axis is the stator 9, and the outer ring is the rotor, forming a so-called outer rotor 8.

[0023] The outer rotor 8 is made of steel and has the shape as Figure 5 shown. The central circle of the outer rotor 8 is eccentrically arranged, and the maximum distance end between the outer circle of the outer rotor 8 and the central circle is tangent to the inner circle of the housing.

[0024] A permanent magnet 16 is provided on the inner wall of the axis circle of the outer rotor 8. The number of the permanent magnets 16 provided is the same as that in the conventional motor setting method, so it will not be elaborated here.

[0025] The stator 9 of the motor is formed by stamping silicon steel sheets as Figure 3 shown. After the silicon steel sheets are formed into an iron core, coils are wound around the iron core, and the wiring between the windings is completed according to the conventional motor technology.

[0026] The stator shaft 10 is a hollow shaft, and a wire hole 14 is provided at the end of the shaft. After the wire 11 on the stator winding passes through the wire hole 14, it is led out of the housing 1 through the axis of the stator shaft 10 and connected to the socket 4 provided on the stator shaft cap 3.

[0027] The rotor side wing plate 15 is a disc cover plate with a shaft hole. The outer diameter of the disc is the same as the inner diameter of the cylinder of the housing 1, and they are in clearance fit. During installation, the discs of the two rotor side wing plates 15 are clamped and fixed together with the outer rotor 8. In this way, the circumferences of the rotor side wing plate 15 and the outer rotor 8 form a rotating cylinder of the compressor. The rotor side wing plate 15 and the outer rotor 8 rotate simultaneously. With the cooperation of the slider, the volume change of the rotating cylinder is realized, thereby realizing the compression process of the gas.

[0028] After the clearance fit between the rotor side wing plate 15 and the inner wall of the housing 1, it is sealed by the lubricating oil fed into the cylinder body.

[0029] The stator shaft 10 is fixedly connected to the cover plates 2 at both ends of the housing 1 by interference fit or welding, so that the housing 1 fixes and supports the stator.

[0030] The rotor side wing plate 15 is a disc cover plate with a shaft hole. The outer diameter of the disc is the same as the inner diameter of the cylinder of the pump body 1, and they are in clearance fit. During installation, the discs of the two rotor side wing plates 15 are clamped and fixed together with the outer rotor 8. In this way, the circumferences of the rotor side wing plate 15 and the outer rotor 8 form a rotating cylinder of the compressor. The rotor side wing plate 15 and the outer rotor 8 rotate simultaneously. With the cooperation of the slider 12, the volume change of the rotating cylinder is realized, thereby realizing the compression process of the gas.

[0031] When this rotary compressor is actually used, the intake pipe is connected to the outlet of the refrigerant liquid storage tank, and a one-way check valve is installed on the outlet pipe 6. During operation, the outer rotor 8 rotates, generating a vacuum on the side of the intake pipe 5 of the compressor pump body 1. The refrigerant liquid is sucked into the low-pressure area in the pump body through the intake pipe. As the outer rotor 8 rotates, the volume of the low-pressure area space in the pump body gradually increases, while the volume of the high-pressure area space gradually decreases. The gas is compressed and output as high-pressure gas through the outlet pipe 6. The one-way valve on the outlet pipe 6 prevents the backflow of the high-pressure gas.

[0032] Embodiment 2: As Figure 4An outer-rotor rotary compressor as shown has the same main body implementation as that of Embodiment 1. To solve the problem of weight asymmetry of the outer rotor 8, the outer rotor 8 is machined into the shape as shown in Figure 5 , that is, a semi-circular cavity 17a is punched out on the disk of the outer rotor 8 to achieve weight balance of the asymmetric outer rotor 8. To improve the heat dissipation effect of the motor, semi-circular cavities 17b of the same shape as on the rotor plane are formed on the rotor side wing plates 15, and heat dissipation holes are added on the end face of the end cover 2, thus forming a heat dissipation channel in the compressor from the stator 9 to the end cover 2, enabling the temperature inside the machine to be led out of the machine body through this heat dissipation channel.

Claims

1. An external rotor rotary compressor, which is composed of a housing, a stator, a rotor, end covers, and sliders. End covers are provided at both ends of the housing, and the housing has a chamber inside. The stator is fixed in the chamber, and the stator is fixed at the axis of the end cover. A stator coil is wound on the stator. The rotor is rotatably sleeved outside the stator, and magnets are embedded on the inner side of the rotor facing the stator. The end covers seal the stator and the rotor in the housing. It is characterized in that: The axis of the rotor is eccentrically designed, and its long axis end is tangent to the inner wall of the housing cavity. A slider groove is provided on the circumferential wall of the housing, and a slider is arranged therein. The slider can move radially in the slider groove. One end of the slider is connected to the bottom of the slider groove through a return spring, and the other end is tangent to the circumferential wall of the outer rotor. The return spring is enclosed in the slider groove by a slider groove cover; both ends of the rotor are also provided with rotor side wing discs. The rotor side wing discs are fixedly installed on both sides of the rotor and are coaxial with the housing. The outer edge of the rotor side wing disc is in clearance fit with the inner wall of the housing; The axis of the stator is a hollow shaft, and a wire hole is provided on the hollow shaft. After the coil winding wire on the stator passes through the wire hole, it is led out of the housing through the hollow shaft and connected to a socket on a stator shaft cap arranged outside the housing; On the axial plane of the rotor, a semi-circular cavity is also provided; On the plane of the rotor side wing disc, a semi-circular cavity having the same shape as that on the axial plane of the rotor is also provided.

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