Rolling rotor type compressor

Abstract

The invention provides a rolling rotor type compressor. The rolling rotor type compressor comprises a shell, an upper shell cover, a lower shell cover, a pump body, a stator assembly and an annular magnet. A cavity is defined by the shell, the upper shell cover and the lower shell cover, and the stator assembly and the annular magnet are both arranged in the cavity. The pump body comprises an upper cylinder cover, an air cylinder, a lower cylinder cover, a crankshaft, a piston and blades, the crankshaft comprises a long shaft, a short shaft and an eccentric part, and an upper thrust surface is arranged on the upper end face of the eccentric part; the upper cylinder cover is fixed to the upper end face of the air cylinder and attached to the upper thrust face of the crankshaft, and the upper cylinder cover can slide relative to the upper thrust face of the crankshaft. The long shaft is fixedly connected with the upper shell cover, and the short shaft is fixedly connected with the lower shell cover; the stator is fixed on the inner wall of the shell; the annular magnet is fixed to the outer wall of the air cylinder in a surrounding mode, and on the plane perpendicular to the crankshaft, the projection of the pump body is located in the projection of the annular magnet. The motor and the pump body are not arranged up and down any more, so that the axial height of the rolling rotor type compressor can be obviously reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of compressors, and particularly to a rolling rotor compressor. Background Art

[0002] In fields such as portable refrigeration, such as air-conditioning clothing, mobile refrigerators, etc., there are high requirements for the height, weight, performance, vibration and noise of the compressor. It is desired that the compressor has a short height, light weight, high performance, and low vibration and noise.

[0003] The existing rolling rotor single-cylinder compressor includes a motor, a pump body, a housing, and upper and lower housing covers; the motor includes a stator assembly and a rotor assembly (the rotor assembly is mainly composed of a rotor core, a magnet, and a balance weight); the pump body mainly includes an upper cylinder head, a cylinder, a lower cylinder head, a crankshaft, a piston, and a vane; the pump body is located below the motor, and the operation of the motor drives the pump body to work to compress the refrigerant.

[0004] For the above-mentioned existing rolling rotor single-cylinder compressor, the vibration has no advantage over the reciprocating piston compressor. It is necessary to develop a double-cylinder compressor to meet the vibration requirements. However, the double-cylinder structure will inevitably cause an increase in the height of the pump body, the overall height of the compressor, and the weight.

[0005] JP01121587A provides a rolling rotor compressor, which is provided with a motor composed of a stator and a rotor in a housing, a crankshaft fixed to the housing, a cylinder portion accommodated inside the rotor and having a compression chamber formed eccentrically, side plates that airtightly seal both side surfaces of the cylinder portion and rotatably hold the rotor with respect to the crankshaft, etc. Although this technical solution can solve the height problem of the rolling rotor compressor, due to the self-gravity of the pump body and the rotor and the upper and lower exhaust pressure differences borne by the two, the upper thrust surface of the crankshaft will bear a large downward resultant force, resulting in relatively large wear and relatively large noise. At the same time, since the rotor is fixed by the side plates (i.e., cylinder heads) on both sides of the pump body and the cylinder is also sealed by the side plates on both sides, when assembling with the pump body, in order to ensure the airtightness of both side surfaces of the cylinder, the processing technology requirements for the rotor are relatively high. Slight deviation will cause leakage on both side surfaces of the cylinder, affecting the compression work of the pump body. And the rotor needs to be assembled with the pump body at the same time and cannot be separated, so the assembly procedure is complex and the requirements are high.

[0006] Therefore, it is urgent to develop a rolling rotor compressor to meet the requirements of being short in height, light in weight, high in performance, low in vibration and noise, and convenient in assembly in fields such as portable refrigeration. Summary of the Invention

[0007] The present invention provides a rolling rotor compressor to solve the technical problems of relatively high axial height and complex assembly of the existing rolling rotor compressor.

[0008] To solve the above technical problems, the present invention provides a rolling rotor compressor, comprising a housing, an upper housing cover, a lower housing cover, a pump body, a stator assembly and an annular magnet;

[0009] The housing, the upper housing cover and the lower housing cover enclose a cavity, and both the stator assembly and the annular magnet are arranged in the cavity;

[0010] The pump body includes an upper cylinder head, a cylinder, a lower cylinder head, a crankshaft, a piston and a vane. The crankshaft includes a long shaft, a short shaft and an eccentric portion, and an upper thrust surface is arranged on the upper end surface of the eccentric portion; the upper cylinder head is fixed on the upper end surface of the cylinder and is in contact with the upper thrust surface of the crankshaft, and the upper cylinder head is slidable relative to the upper thrust surface of the crankshaft; the lower cylinder head is fixed on the lower end surface of the cylinder; the piston is sleeved on the eccentric portion; the long shaft is fixedly connected with the upper housing cover, and the short shaft is fixedly connected with the lower housing cover; a spring hole and a vane groove that communicate with each other are arranged in the cylinder, a spring is installed in the spring hole, and the vane is installed in the vane groove; one end of the vane is connected with the spring, and the other end is in contact with the outer wall of the piston;

[0011] The stator assembly is fixed on the inner wall of the housing and is arranged around the outside of the annular magnet; the annular magnet is fixedly arranged around the outer wall of the cylinder, and in a plane perpendicular to the crankshaft, the projection of the pump body is located inside the projection of the annular magnet.

[0012] Preferably, the axial magnetic center of the annular magnet is lower than the axial magnetic center of the stator assembly.

[0013] Preferably, the height difference between the axial magnetic center of the annular magnet and the axial magnetic center of the stator assembly is 1 mm to 3 mm.

[0014] Preferably, a lower thrust surface for fitting with the upper end surface of the lower cylinder head is arranged on the lower end surface of the eccentric portion.

[0015] Preferably, the cylinder is provided with a suction cavity, and a suction passage is arranged inside the crankshaft; one end of the suction passage penetrates through the upper end surface of the long shaft, and the other end communicates with the suction cavity.

[0016] Preferably, the annular magnet is fixedly arranged around the outer wall of the cylinder by glue.

[0017] Preferably, the lower cylinder head is provided with an exhaust passage.

[0018] Preferably, the rolling rotor compressor further includes an exhaust pipe, and the exhaust pipe is installed on the upper housing cover and communicates with the cavity.

[0019] Preferably, the rolling rotor compressor further includes a lower muffler, which is installed on the lower cylinder head.

[0020] Preferably, the lower muffler is installed on the lower cylinder head by bolts.

[0021] In the rolling rotor compressor provided by the present invention, an annular magnet is fixedly surrounded on the outer wall of the cylinder, and a stator assembly is surrounded outside the annular magnet, that is, the motor is arranged outside the pump body (here the motor is composed of the stator assembly and the annular magnet). Therefore, the motor and the pump body are no longer arranged vertically as in the prior art, which can significantly reduce the axial height of the rolling rotor compressor. The annular magnet and the pump body (excluding the crankshaft) form a rotating assembly. When the compressor is powered on and running, the crankshaft is rigidly connected to the upper shell cover and the lower shell cover, and the crankshaft remains stationary (the piston can slide and rotate on the eccentric part of the crankshaft). The stator assembly generates a magnetic field, and the rotating assembly rotates around the crankshaft under the action of the magnetic field, thereby completing the compression of the refrigerant.

[0022] In addition, in a plane perpendicular to the crankshaft, the projection of the pump body is located inside the projection of the annular magnet. The annular magnet does not need to be fixed between the upper cylinder head and the lower cylinder head. In this way, it can be ensured that the whole pump body is located inside the annular magnet, and the components of the annular magnet and the pump body will not interfere with each other. Therefore, the sealing performance of both end faces of the cylinder will not be affected during assembly. Therefore, it is not necessary to assemble the rotor while assembling the pump body, but the pump body can be assembled first and then assembled with the annular magnet, which reduces the requirements for the processing technology and simplifies the assembly procedure. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 is a schematic structural diagram of a rolling rotor compressor provided by an embodiment of the present invention.

[0024] Figure 2 is Figure 1 a schematic structural diagram after rotating a certain angle.

[0025] Figure 3 is Figure 2 a schematic cross-sectional view of the rotating assembly and the eccentric part of the crankshaft in taken along a radial direction parallel to the cylinder and from the middle position of the cylinder.

[0026] [The reference numerals are explained as follows]:

[0027] Housing - 1, upper shell cover - 2, lower shell cover - 3, stator assembly - 4, annular magnet - 5, upper cylinder head - 6, cylinder - 7, lower cylinder head - 8, crankshaft - 9, piston - 10, vane - 11, spring - 12, exhaust pipe - 13, lower muffler - 14, suction chamber - 15, compression chamber - 16;

[0028] Long shaft - 91, short shaft - 92, eccentric part - 93, suction passage - 94;

[0029] Axial magnetic center of the stator assembly - 41, axial magnetic center of the ring magnet - 51;

[0030] Upper thrust surface - 931, lower thrust surface - 932. Detailed implementation mode

[0031] To make the objectives, advantages and features of the present invention clearer, the following further describes in detail a rolling rotor compressor proposed by the present invention with reference to the accompanying drawings. It should be noted that the drawings are all in a very simplified form and use non-precise scales, only for conveniently and clearly assisting in explaining the objectives of the embodiments of the present invention.

[0032] In the description of the present invention, the qualifier terms such as "first", "second", etc. are added for convenient description and reference, and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with qualifier terms such as "first", "second", etc. may explicitly or implicitly include one or more of such features.

[0033] As Figures 1-3 shown, this embodiment provides a rolling rotor compressor, including a housing 1, an upper housing cover 2, a lower housing cover 3, a pump body, a stator assembly 4 and a ring magnet 5; the housing 1, the upper housing cover 2 and the lower housing cover 3 enclose to form a cavity, and both the stator assembly 4 and the ring magnet 5 are arranged in the cavity; the pump body includes an upper cylinder head 6, a cylinder 7, a lower cylinder head 8, a crankshaft 9, a piston 10 and a vane 11, the crankshaft 9 includes a long shaft 91, a short shaft 92 and an eccentric part 93, and an upper thrust surface 931 is arranged on the upper end surface of the eccentric part 93; the upper cylinder head 6 is fixed on the upper end surface of the cylinder 7 and is in contact with the upper thrust surface 931 of the crankshaft 9, and the upper cylinder head 6 is slidable relative to the upper thrust surface 931 of the crankshaft 9; the lower cylinder head 8 is fixed on the lower end surface of the cylinder 7; the piston 10 is sleeved on the eccentric part 93; the long shaft 91 is fixedly connected with the upper housing cover 2, and the short shaft 92 is fixedly connected with the lower housing cover 3; a spring hole and a vane groove that communicate with each other are arranged in the cylinder 7, a spring 12 is installed in the spring hole, and the vane 11 is installed in the vane groove; one end of the vane 11 is connected with the spring 12, and the other end is in contact with the outer wall of the piston 10; the stator assembly 4 is fixed on the inner wall of the housing 1 and is arranged around the outside of the ring magnet 5; the ring magnet 5 is fixedly arranged around the outer wall of the cylinder 7, and in a plane perpendicular to the crankshaft 9, the projection of the pump body is located inside the projection of the ring magnet 5.

[0034] A rolling rotor compressor provided in this embodiment has an annular magnet 5 fixedly surrounded on the outer wall of a cylinder 7, and a stator assembly 4 is disposed around the annular magnet 5, that is, the motor is arranged outside the pump body (here the motor consists of the stator assembly 4 and the annular magnet 5). Therefore, the motor and the pump body are no longer arranged vertically as in the prior art, which can significantly reduce the axial height of the rolling rotor compressor. The annular magnet 5 and the pump body (excluding the crankshaft 9) form a rotating assembly. When the compressor is powered on and operates, since the crankshaft 9 is rigidly connected to the upper housing cover 2 and the lower housing cover 3, the crankshaft 9 remains stationary (the piston 10 can slide and rotate on the eccentric part 93 of the crankshaft 9). The stator assembly 4 generates a magnetic field, and the rotating assembly rotates around the crankshaft 9 under the action of the magnetic field, thereby completing the compression of the refrigerant. In addition, in a plane perpendicular to the crankshaft 9, the projection of the pump body is located inside the projection of the annular magnet 5. The annular magnet 5 does not need to be fixed between the upper cylinder head 6 and the lower cylinder head 8. In this way, it can be ensured that the entire pump body is located inside the annular magnet 5, and the components of the annular magnet 5 and the pump body will not interfere with each other. Therefore, the sealing performance of the two end faces of the cylinder 7 will not be affected during assembly. Thus, it is not necessary to assemble the rotor while assembling the pump body, but the pump body can be assembled first and then assembled with the annular magnet 5, which reduces the requirements for the processing technology and simplifies the assembly procedure.

[0035] Preferably, as Figure 1 shown, the axial magnetic center 51 of the annular magnet 5 ( Figure 1 the black dot position indicated by 51 in Figure 1 ) is lower than the axial magnetic center 41 of the stator assembly 4 ( the black dot position indicated by 41 in Figure 1 ). When the axial magnetic center of the annular magnet 5 is lower than the axial magnetic center of the stator assembly, the distance from the upper end face of the annular magnet 5 to the upper end face of the stator assembly 4 is greater than the distance from the lower end face of the annular magnet 5 to the lower end face of the stator assembly 4. In this way, the annular magnet 5 can be subjected to an upward axial magnetic force FΦ from the stator assembly 4, thereby reducing the pressure exerted by the rotating assembly on the upper thrust surface 931 of the crankshaft 9 and reducing the noise caused by friction and wear.

[0036] Assume that Fm is the gravity of the rotating assembly, Fu is the axial downward refrigerant pressure on the upper surface of the rotating assembly (including the upper surface of the upper cylinder head 6, the upper surface of the fixing bolts for fixing the upper cylinder head 6, the upper surface of the annular magnet 5, etc.). The refrigerant flow path is successively the suction passage 94 in the crankshaft 9 - the suction chamber 15 in the cylinder 7 - the compression chamber 16 in the cylinder 7 - the exhaust port on the cylinder 7 - the exhaust port on the lower cylinder head 8 - the exhaust passage on the lower cylinder head 8 - the exhaust passage on the cylinder 7 - the exhaust passage on the upper cylinder head 6 - the cavity - the exhaust pipe 13. Fd is the axial upward refrigerant pressure on the lower surface of the rotating assembly (including the lower surface of the fixing bolts for fixing the lower cylinder head 8, the lower surface of the annular magnet 5, and the lower surface of the lower cylinder head 8, etc.). The force on the upper thrust surface 931 of the crankshaft 9 is (Fm + Fu) - (FΦ + Fd). When (Fm + Fu) > (FΦ + Fd), the upper thrust surface 931 of the crankshaft 9 is subjected to an axial downward pressure at this time. When (Fm + Fu) = (FΦ + Fd), neither the upper thrust surface 931 nor the lower thrust surface 932 of the crankshaft 9 is subjected to force, and the rotating assembly reaches the magnetic levitation state. At this time, there is no frictional loss in the axial direction. When (Fm + Fu) < (FΦ + Fd), the lower thrust surface 932 of the crankshaft 9 is subjected to an axial upward pressure at this time.

[0037] Preferably, as Figure 1 shown, the height difference between the axial magnetic center 51 of the annular magnet 5 and the axial magnetic center 41 of the stator assembly 4 is 1 mm to 3 mm. Through experimental verification, if the height difference between the axial magnetic center 51 of the annular magnet 5 and the axial magnetic center 41 of the stator assembly 4 is less than 1 mm, the magnetic force FΦ received by the annular magnet 5 is too small to affect the axial downward pressure on the upper thrust surface 931 of the crankshaft 9. If the height difference between the axial magnetic center 51 of the annular magnet 5 and the axial magnetic center 41 of the stator assembly 4 is greater than 3 mm, the magnetic force FΦ received by the annular magnet 5 is too large, which will increase the axial upward pressure on the lower thrust surface 932 of the crankshaft 9. Only when the magnetic force FΦ received by the annular magnet 5 is appropriate can the force on the upper thrust surface 931 or the lower thrust surface 932 of the crankshaft 9 be reduced.

[0038] Preferably, as Figure 1 shown, the lower thrust surface 932 for fitting with the upper end surface of the lower cylinder head 8 is provided on the lower end surface of the eccentric part 93. The provision of the lower thrust surface 932 can improve the stability of the rotating assembly and prevent the rotating assembly from moving upward. Since the rotating assembly can move up and down relative to the upper thrust surface 931 and the lower thrust surface 932 of the crankshaft 9, at the same moment, at most only one thrust surface of the upper thrust surface 931 and the lower thrust surface 932 of the crankshaft 9 is subjected to pressure.

[0039] Preferably, as Figure 1As shown, the cylinder 7 is provided with a suction chamber 15, and a suction passage 94 is arranged inside the crankshaft 9; one end of the suction passage 94 penetrates through the upper end surface of the long shaft 91, and the other end communicates with the suction chamber 15. The refrigerant can enter the cylinder 7 through the suction passage 94 for compression, and the compressed refrigerant is discharged into the cavity and then discharged from the housing 1 through the exhaust pipe 13.

[0040] Preferably, as Figure 1 and Figure 3 shown, the annular magnet 5 is fixedly surrounded on the outer wall of the cylinder 7 by glue. The glue can firmly and quickly fix the annular magnet 5 on the outer wall of the cylinder 7, with simple process and convenient assembly. In other embodiments, the annular magnet 5 can be fixed on the outer wall of the cylinder 7 by interference fit or welding.

[0041] Preferably, as Figure 1 shown, the lower cylinder head 8 is also provided with an exhaust passage, and the compressed refrigerant is discharged from the pump body through the exhaust passage of the lower cylinder head 8. In this way, the exhaust passage located in the lower cylinder head 8 can avoid interfering with the suction passage 94 located in the upper part of the pump body. Preferably, as Figure 1 shown, the scroll compressor provided in this embodiment further includes an exhaust pipe 13, and the exhaust pipe 13 is installed on the upper housing cover 2 and communicates with the cavity. The compressed refrigerant in the cavity can be discharged from the housing 1 through the exhaust pipe 13.

[0042] Preferably, as Figure 1 shown, the scroll compressor provided in this embodiment further includes a lower muffler 14, and the lower muffler 14 is installed on the lower cylinder head 8. After the compressed refrigerant is discharged from the lower cylinder head 8, the noise can be reduced through the blockage of the lower muffler 14.

[0043] Preferably, as Figure 1 shown, the lower muffler 14 is installed on the lower cylinder head 8 by bolts, which is convenient for installing the lower muffler 14.

[0044] In summary, a rolling piston compressor provided by the present invention has a ring magnet 5 fixedly surrounded on the outer wall of a cylinder 7, and a stator assembly 4 is arranged around the ring magnet 5, that is, the motor is arranged outside the pump body (here the motor is composed of the stator assembly 4 and the ring magnet 5). Therefore, the motor and the pump body are no longer arranged vertically as in the prior art, which can significantly reduce the axial height of the rolling piston compressor. The ring magnet 5 and the pump body (excluding the crankshaft 9) form a rotating assembly. When the compressor is powered on and running, since the crankshaft 9 is rigidly connected to the upper housing cover 2 and the lower housing cover 3, the crankshaft 9 remains stationary (the piston 10 can slide and rotate on the eccentric part 93 of the crankshaft 9). The stator assembly 4 generates a magnetic field, and the rotating assembly rotates around the crankshaft 9 under the action of the magnetic field, thereby completing the compression of the refrigerant. In addition, in a plane perpendicular to the crankshaft 9, the projection of the pump body is located inside the projection of the ring magnet 5. The ring magnet 5 does not need to be fixed between the upper cylinder head 6 and the lower cylinder head 8. In this way, it can be ensured that the whole pump body is located inside the ring magnet 5, and the ring magnet 5 and each component of the pump body will not interfere with each other. Therefore, the sealing performance of both end faces of the cylinder 7 will not be affected during assembly. Thus, it is not necessary to assemble the rotor while assembling the pump body, but the pump body can be assembled first and then assembled with the ring magnet 5, which reduces the requirements for the processing technology and simplifies the assembly procedure.

[0045] The above description is only a description of the preferred embodiments of the present invention, and does not limit the scope of the present invention in any way. Any changes and modifications made by those of ordinary skill in the art according to the above disclosure belong to the protection scope of the present invention.

Claims

1. A rolling rotor compressor, characterized in that, It includes a housing, an upper shell cover, a lower shell cover, a pump body, a stator assembly and an annular magnet; The housing, the upper shell cover and the lower shell cover enclose to form a cavity, and both the stator assembly and the annular magnet are arranged in the cavity; The pump body includes an upper cylinder head, a cylinder, a lower cylinder head, a crankshaft, a piston and a vane. The crankshaft includes a long shaft, a short shaft and an eccentric part, and an upper thrust surface is arranged on the upper end surface of the eccentric part; the upper cylinder head is fixed on the upper end surface of the cylinder and is in contact with the upper thrust surface of the crankshaft, and the upper cylinder head is slidable relative to the upper thrust surface of the crankshaft; the lower cylinder head is fixed on the lower end surface of the cylinder; the piston is sleeved on the eccentric part; the long shaft is fixedly connected with the upper shell cover, and the short shaft is fixedly connected with the lower shell cover; a spring hole and a vane groove which are communicated with each other are arranged in the cylinder, a spring is installed in the spring hole, and the vane is installed in the vane groove; one end of the vane is connected with the spring, and the other end is in contact with the outer wall of the piston; The stator assembly is fixed on the inner wall of the housing and is arranged around the outside of the annular magnet; the annular magnet is fixedly arranged around the outer wall of the cylinder, and in a plane perpendicular to the crankshaft, the projection of the pump body is located inside the projection of the annular magnet.

2. The rolling rotor type compressor according to claim 1, wherein The axial magnetic center of the annular magnet is lower than the axial magnetic center of the stator assembly.

3. The rolling rotor type compressor according to claim 2, wherein The height difference between the axial magnetic center of the annular magnet and the axial magnetic center of the stator assembly is 1 mm to 3 mm.

4. A rolling rotor type compressor according to claim 1, characterized in that, A lower thrust surface for fitting with the upper end surface of the lower cylinder head is arranged on the lower end surface of the eccentric part.

5. The rolling rotor type compressor according to claim 1, characterized in that, The cylinder is provided with a suction cavity, and a suction passage is arranged inside the crankshaft; one end of the suction passage penetrates through the upper end surface of the long shaft, and the other end is communicated with the suction cavity.

6. The rolling rotor type compressor according to claim 1, characterized in that, The annular magnet is fixedly arranged around the outer wall of the cylinder through glue.

7. A rolling rotor type compressor according to claim 1, characterized in that, The lower cylinder head is provided with an exhaust passage.

8. The rolling rotor type compressor according to claim 1, characterized in that, The rolling rotor compressor further includes an exhaust pipe, and the exhaust pipe is installed on the upper shell cover and is communicated with the cavity.

9. The rolling rotor type compressor according to claim 7, characterized in that, The rolling rotor compressor further includes a lower muffler, and the lower muffler is installed on the lower cylinder head.

10. A rolling rotor compressor according to claim 9, characterized in that, The lower muffler is installed on the lower cylinder head through bolts.

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