Fully enclosed compressor

Abstract

The present invention provides a fully enclosed compressor, comprising a closed outer shell, a rotating main shaft is installed in the closed outer shell, the rotating main shaft comprises a first shaft section for fitting a motor assembly and a second shaft section for fitting a pump assembly, the first shaft section and the second shaft section are connected to form the rotating main shaft through a flexible coupling. The fully enclosed compressor provided by the present invention divides the rotating main shaft into a first shaft section and a second shaft section that can be assembled, improves the rigidity of each shaft section and thus reduces the flexible deformation of the rotating main shaft, effectively preventing possible collision between the rotor and the stator.

Description

Technical Field

[0001] The invention belongs to the technical field of compressors, and in particular relates to a fully enclosed compressor. Background Art

[0002] The traditional fully enclosed rotary compressor adopts a direct-connected drive structure, that is, one end of the pump body main shaft cooperates with the motor rotor assembly, and the other end cooperates with the pump body. The motor directly drives the main shaft to rotate, thereby completing the suction, compression and exhaust processes of the compressor pump body. The advantage of adopting this structure is that the compressor has a compact structure, a small number of parts and a small size. Therefore, the direct-connected drive structure has become a conventional solution for small fully enclosed rotary compressors. However, with the increase of displacement and the increase of speed, the stacking height and weight of the motor rotor increase, the centrifugal force increases, the main shaft deflection of the cantilever structure increases, and the rotor end and the inner diameter of the stator will scratch and collide, affecting the reliability and noise of the compressor. In addition, the pump body and the shell of the traditional solution are connected by welding points. Welding deformation easily leads to poor coaxiality of the motor stator and rotor and causes consistency fluctuation problems during mass production, which makes the noise have consistency fluctuation problems. Based on the above-mentioned deficiencies in the prior art, the present invention is proposed. Summary of the invention

[0003] Therefore, the technical problem to be solved by the present invention is to provide a fully enclosed compressor, which divides the rotating main shaft into a first shaft section and a second shaft section that can be assembled, thereby improving the stiffness of each shaft section and thereby reducing the flexible deformation of the rotating main shaft, and effectively preventing possible collision between the rotor and the stator.

[0004] In order to solve the above problems, the present invention provides a fully enclosed compressor, including a closed outer shell, in which a rotating main shaft is installed, the rotating main shaft includes a first shaft section for fitting a motor assembly and a second shaft section for fitting a pump body assembly, the first shaft section and the second shaft section are connected to form the rotating main shaft by a flexible coupling.

[0005] Preferably, the flexible coupling comprises an elastic coupling or a cross slide.

[0006] Preferably, the cross slider includes a slider body, and the end surfaces on opposite sides of the slider body are respectively provided with a first boss and a first groove, in the axial projection of the slider body, the first boss and the first groove form a cross, a second groove matching the first boss is constructed at the end head of the first shaft section, and a second boss matching the first groove is constructed at the end head of the second shaft section; or, a second boss matching the first groove is constructed at the end head of the first shaft section, and a second groove matching the first boss is constructed at the end head of the second shaft section.

[0007] Preferably, a first oil passage is constructed on the first boss, the first oil passage extends along the axial direction of the slider body and penetrates the first groove, and the first shaft section and the second shaft section both have a main oil delivery channel extending along their axial direction, and the main oil delivery channel penetrates through the first oil passage.

[0008] Preferably, the first oil channel has a first branch oil channel extending on both sides of the width of the first boss and / or the first groove, and the first branch oil channel is on the first boss and / or the first groove; and / or the main oil delivery channel on the second boss has a second branch oil channel extending on both sides of the width of the second boss.

[0009] Preferably, the axial height of the first boss is h1, the radial width of the first boss is b1, the axial depth of the first groove is h2, the radial width of the first groove is b2, 1mm≤h1≤15mm, and / or, 1mm≤b1≤15mm, and / or, 1mm≤h2≤15mm, and / or, 1mm≤b2≤15mm.

[0010] Preferably, when the cross slider is assembled with the first shaft segment and / or the second shaft segment, the single-sided clearance between the first boss and the second groove is L1, the single-sided clearance between the first groove and the second boss is L2, 0<L1≤100μm, and / or, 0<L2≤100μm.

[0011] Preferably, the fully enclosed compressor further comprises a supporting flange, wherein the supporting flange is connected to the inner wall of the enclosed outer shell, and the first shaft segment and / or the second shaft segment are pivotally connected to the supporting flange.

[0012] Preferably, the motor assembly and / or the pump body assembly is fixedly connected to the supporting flange.

[0013] Preferably, the support flange is located in the area between the motor assembly and the pump body assembly, the motor assembly includes a stator, and the stator is fixedly connected to the support flange via a first connecting member; and / or the pump body assembly includes a first flange, and the first flange is fixedly connected to the support flange via a second connecting member.

[0014] Preferably, a first connecting column is constructed on the end face of the support flange facing the motor assembly, and the first connecting member can be detachably connected to the first connecting column; and / or a second connecting column is constructed on the end face of the support flange facing the pump body assembly, and the second connecting member can be detachably connected to the second connecting column.

[0015] Preferably, an axial hole is further configured on the supporting flange, and the first shaft segment and / or the second shaft segment can be pivotally connected in the axial hole via a bearing.

[0016] Preferably, the compressor is a vane compressor.

[0017] The present invention provides a fully enclosed compressor, which improves the structure of the entire main shaft commonly used in the fully enclosed compressor into a structure in which the first shaft section and the second shaft section are connected as a whole through a flexible coupling in the present application, so that the axial length of the rotating main shaft is shortened, which improves the rigidity of the rotating main shaft, and effectively avoids the occurrence of excessive flexible deformation of the rotating main shaft due to excessive length. This can undoubtedly avoid the occurrence of possible collision and scratches between the rotor and the stator, and can also effectively reduce the noise caused by the uneven air gap between the stator and the rotor; at the same time, the bending mode frequency of the shaft system (rotating main shaft) can be increased, avoiding the main excitation frequency, and thus reducing the bending mode resonance noise of the shaft system; in addition, the first shaft section and the second shaft section are connected by the flexible coupling, which can fully utilize the position compensation function of the flexible coupling to ensure compensation for the deviation in coaxiality between the two without affecting the coaxiality of the first shaft section and the stator. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 A schematic diagram of the internal structure of a compressor according to an embodiment of the present invention;

[0019] Figure 2 for Figure 1 Assembly drawing of the motor assembly, rotating spindle and pump assembly;

[0020] Figure 3 for Figure 2 Schematic diagram of the decomposition structure;

[0021] Figure 4 It is a schematic diagram of the three-dimensional structure of a cross slide in a compressor according to an embodiment of the present invention;

[0022] Figure 5 for Figure 4 A front view of

[0023] Figure 6 for Figure 4 Left view of

[0024] Figure 7 It is a schematic diagram of the assembly between the first shaft section, the second shaft section and the cross slide in the compressor of the embodiment of the present invention;

[0025] Figure 8 It is a schematic structural diagram of a support flange in a compressor according to an embodiment of the present invention.

[0026] The reference numerals are:

[0027] 1. Closed outer shell; 2. Rotating main shaft; 21. First shaft section; 211. Second groove; 22. Second shaft section; 221. Second boss; 23. Main oil delivery channel; 231. Second branch oil channel; 3. Flexible coupling; 31. Cross slider; 311. Slider body; 312. First boss; 313. First groove; 314. First oil channel; 315. First branch oil channel; 4. Support flange; 41. First connecting column; 42. Second connecting column; 43. Shaft hole; 44. Circulation hole; 5. Bearing; 100. Motor assembly; 101. First connecting piece; 102. Stator; 200. Pump assembly; 201. Second connecting piece; 202. First flange. DETAILED DESCRIPTION

[0028] See also Figures 1 to 8 As shown, according to an embodiment of the present invention, a fully enclosed compressor is provided, including a closed outer shell 1, in which a rotating main shaft 2 is installed, and the rotating main shaft 2 includes a first shaft segment 21 for fitting a motor assembly 100 and a second shaft segment 22 for fitting a pump body assembly 200, and the first shaft segment 21 and the second shaft segment 22 are connected to form the rotating main shaft 2 via a flexible coupling 3. It can be understood that the motor assembly 100 includes a stator 102 and a rotor (not labeled in the figure), and the rotor is fitted on the first shaft segment 21. The pump body assembly 200 includes a first flange 202 and a second flange (not labeled in the figure) and a cylinder (not labeled in the figure) arranged correspondingly thereto, and the second shaft segment 22 is fitted with corresponding compression actuators, such as rollers and vanes. These are structures already available in the prior art and are not particularly limited by the present invention. In this technical solution, the structure of the entire main shaft commonly used in a fully enclosed compressor is improved to the structure in this application in which the first shaft section 21 and the second shaft section 22 are connected as a whole through a flexible coupling 3, so that the axial length of the rotating main shaft 2 is shortened, which improves the rigidity of the rotating main shaft 2, and effectively avoids the occurrence of excessive flexible deformation of the rotating main shaft 2 due to its excessive length. This can undoubtedly avoid the possible collision and scratching between the rotor and the stator 102, and can also effectively reduce the noise caused by the uneven air gap between the stator and the rotor; at the same time, the bending mode frequency of the shaft system (rotating main shaft 2) can be increased, avoiding the main excitation frequency, and thus reducing the bending mode resonance noise of the shaft system; in addition, the first shaft section 21 and the second shaft section 22 are connected by the flexible coupling 3, which can make full use of the position compensation effect of the flexible coupling 3 to ensure compensation for the deviation in coaxiality between the two without affecting the coaxiality of the first shaft section 21 and the stator 102.

[0029] The flexible coupling 3 may, for example, include an elastic coupling or a cross slider 31. Preferably, the flexible coupling 3 adopts a cross slider 31. Specifically, the cross slider 31 includes a slider body 311. The end faces of the slider body 311 on opposite sides are respectively provided with a first boss 312 and a first groove 313. In the axial projection of the slider body 311, the first boss 312 and the first groove 313 form a cross (the cross here can be a standard 90° vertical, and of course the corresponding angle can also be designed to be less than or greater than 90°). A second groove 211 matching the first boss 312 is constructed at the end head of the first shaft segment 21, and a second boss 221 matching the first groove 313 is constructed at the end head of the second shaft segment 22; or, a second boss 221 matching the first groove 313 is constructed at the end head of the first shaft segment 21, and a second groove 211 matching the first boss 312 is constructed at the end head of the second shaft segment 22. The cross-shaped first boss 312 and the first groove 313 are matched with the end parts of the corresponding first shaft segment 21 and the second shaft segment 22 to fully compensate for the coaxiality deviation between the first shaft segment 21 and the second shaft segment 22. The structure is simple and the corresponding cost is low.

[0030] In terms of specific processing and manufacturing, preferably, the axial height of the first boss 312 is h1, the radial width of the first boss 312 is b1, the axial depth of the first groove 313 is h2, the radial width of the first groove 313 is b2, 1mm≤h1≤15mm, and / or, 1mm≤b1≤15mm, and / or, 1mm≤h2≤15mm, and / or, 1mm≤b2≤15mm. In order to ensure the convenience of assembly between the cross slider 31 and the first shaft segment 21 and the second shaft segment 22, preferably, when the cross slider 31 is assembled with the first shaft segment 21 and / or the second shaft segment 22, the single-side clearance between the first boss 312 and the second groove 211 is L1, and the single-side clearance between the first groove 313 and the second boss 221 is L2, 0<L1≤100μm, and / or, 0<L2≤100μm.

[0031] In order to utilize the rotational power of the rotating main shaft 2 to draw the lubricating oil in the oil pool below and lubricate the parts matched with the rotating main shaft 2, preferably, the first boss 312 is constructed with a first oil passage 314, the first oil passage 314 extends along the axial direction of the slider body 311 and is connected with the first groove 313, the first shaft section 21 and the second shaft section 22 both have an oil delivery main channel 23 extending along the axial direction thereof, the oil delivery main channel 23 is connected with the first oil passage 314, preferably, the first oil passage 314 has a first first branch oil passage 315 extending toward both sides of the width of the first boss 312 and / or the first groove 313, and the first branch oil passage 315 is located on the first boss 312 and / or the first groove 313; and / or, the oil delivery main channel 23 on the second boss 221 has a second branch oil passage 231 extending toward both sides of the width of the second boss 221. This technical solution is adopted. The wear of the mating surfaces between the cross slider 31 and the first shaft segment 21 and the second shaft segment 22 can be reduced, and at the same time, the lubricating oil drawn from the second shaft segment 22 can continue to flow upward to the first shaft segment 21 via the cross slider 31 .

[0032] Furthermore, in terms of the support and fixation of the motor assembly 100, the pump assembly 200, the first shaft segment 21 and the second shaft segment 22, the forms can be various, for example, each component can be individually fixedly connected to the inner wall of the closed outer shell 1 (shrunk or welded, etc.), or some of the components can be fixedly connected to the inside of the closed outer shell 1, and the remaining components can be connected to the fixed components. Preferably, the fully enclosed compressor also includes a support flange 4, which is connected to the inner wall of the closed outer shell 1, and the first shaft segment 21 And / or the second shaft section 22 is pivotally connected to the support flange 4, and the motor assembly 100 and / or the pump body assembly 200 is fixedly connected to the support flange 4. In this way, the support flange 4 becomes a common mounting platform carrier for various components in the compressor. At this time, too many components are prevented from being directly connected to the inner wall of the closed outer shell 1. On the one hand, this reduces the requirements for the processing accuracy of the closed outer shell 1, and can also greatly prevent the shape and position errors of the closed outer shell 1 from having an adverse effect on the coaxiality of the rotor and stator in the motor assembly. For example, when the support flange 4 is connected to the closed outer shell 1 by welding, since the mounting carrier (reference) of the motor assembly 100 is no longer the existing closed outer shell 1, the deformation caused by welding has little effect on the coaxiality of the stator and rotor in the motor assembly 100.

[0033] Specifically, the support flange 4 is located in the area between the motor assembly 100 and the pump body assembly 200, so that the loads of the rotating main shaft 2 at both ends of the axial direction can be relatively balanced. More importantly, the support flange 4 at this time can also shield the exhaust of the pump body assembly 200 to a certain extent, so that the discharged high-speed refrigerant airflow will not directly impact the rotor, which can significantly reduce the eddy current noise caused by the refrigerant discharged from the pump body assembly 200 being cut by the rotor rotation. The motor assembly 100 includes a stator 102, and the stator 102 is fixedly connected to the support flange 4 through a first connecting member 101; and / or, the pump body assembly 200 includes a first flange 202, and the first flange 202 is fixedly connected to the support flange 4 through a second connecting member 201. More specifically, a first connecting column 41 (with a corresponding screw hole) is constructed on the end face of the support flange 4 facing the motor assembly 100, and the first connecting member 101 (such as a long screw or a long bolt) can be detachably connected to the first connecting column 41; and / or, a second connecting column 42 (with a corresponding screw hole) is constructed on the end face of the support flange 4 facing the pump body assembly 200, and the second connecting member 201 (such as a long screw or a long bolt) can be detachably connected to the second connecting column 42. The first connecting column 41 and the second connecting column 42 protrude from the main body of the support flange 4, which can make the connection between the motor assembly 100 and the pump body assembly 200 and the support flange 4 more reliable and stable.

[0034] The support flange 4 can also be arranged at an end of the first shaft section 21 away from the second shaft section 22, so as to more effectively constrain its free end, thereby better ensuring the coaxiality of the stator and rotor, and solving the noise consistency problem caused by coaxiality differences during mass production. Of course, a plurality of support flanges 4 can be arranged at intervals in the axial direction of the rotating main shaft 2.

[0035] The main body of the support flange 4 is also configured with an axial hole 43, and the first shaft section 21 and / or the second shaft section 22 can be pivotally connected to the axial hole 43 through a bearing 5 (which can be a rolling bearing or a sliding bearing) to limit the rotation of the rotating main shaft 2. Furthermore, the main body of the support flange 4 is also configured with a plurality of flow holes 44 for discharging the refrigerant airflow. The plurality of flow holes 44 are preferably arranged at the peripheral position of the edge of the support flange 4 to avoid the area facing the rotor, thereby more effectively preventing the direct contact between the high-speed exhaust airflow of the pump body assembly 200 and the rotor, and further reducing the eddy current noise generated thereby.

[0036] Preferably, the compressor is a vane compressor.

[0037] The specific assembly of the compressor using the above technical solution can be carried out in the following steps:

[0038] (1) Assemble the first shaft section 21 and the rotor; (2) Assemble the second shaft section 22 and the pump body assembly; (3) Install one or two rolling bearings (bearing 5) into the shaft hole 43 (with a bearing seat inside) of the support flange 4; (4) Install the pre-installed first shaft section 21 and the rotor into the rolling bearing; (5) Fix the pre-installed second shaft section 22 and the pump body assembly to the support flange 4 through the second connecting member 201, and install the flexible coupling 3 between the first shaft section 21 and the second shaft section 22; (6) Fix the stator 102 to the support flange 4 through the first connecting member 101; (7) Fix the support flange 4 to the inner wall of the closed outer shell 1 by shrink fitting or spot welding.

[0039] It is easy for those skilled in the art to understand that, under the premise of no conflict, the above-mentioned advantageous methods can be freely combined and superimposed.

[0040] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention shall be included in the protection scope of the present invention. The above are only preferred embodiments of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and variations can be made without departing from the technical principles of the present invention, and these improvements and variations should also be regarded as the protection scope of the present invention.

Claims

1. A fully enclosed compressor, characterized in that: The fully enclosed compressor comprises a closed outer shell (1), wherein a rotating main shaft (2) is arranged inside the closed outer shell (1), wherein the rotating main shaft (2) comprises a first shaft section (21) for fitting a motor assembly (100) and a second shaft section (22) for fitting a pump assembly (200), wherein the first shaft section (21) and the second shaft section (22) are connected to form the rotating main shaft (2) via a flexible coupling (3); the fully enclosed compressor further comprises a supporting flange (4), wherein the supporting flange (4) is connected to the inner wall of the closed outer shell (1), the first shaft section (21) and / or the second shaft section (22) are pivotally connected to the supporting flange (4), and the motor assembly (100) and / or the pump assembly (200) are fixedly connected to the supporting flange (4).

2. The fully enclosed compressor according to claim 1, characterized in that: The flexible coupling (3) comprises an elastic coupling or a cross slide (31).

3. The fully enclosed compressor according to claim 2, characterized in that: The cross slider (31) comprises a slider body (311), and end surfaces on opposite sides of the slider body (311) are respectively provided with a first boss (312) and a first groove (313); in the axial projection of the slider body (311), the first boss (312) and the first groove (313) form a cross; a second groove (211) matching the first boss (312) is constructed on the end of the first shaft section (21), and a second boss (221) matching the first groove (313) is constructed on the end of the second shaft section (22); or a second boss (221) matching the first groove (313) is constructed on the end of the first shaft section (21), and a second groove (211) matching the first boss (312) is constructed on the end of the second shaft section (22).

4. The fully enclosed compressor according to claim 3, characterized in that: A first oil passage (314) is formed on the first boss (312). The first oil passage (314) extends along the axial direction of the slider body (311) and is connected to the first groove (313). The first shaft section (21) and the second shaft section (22) both have a main oil passage (23) extending along their axial direction. The main oil passage (23) is connected to the first oil passage (314).

5. The fully enclosed compressor according to claim 4, characterized in that: The first oil passage (314) has a first branch oil passage (315) extending towards both sides of the width of the first boss (312) and / or the first groove (313), and the first branch oil passage (315) is located on the first boss (312) and / or the first groove (313); and / or the main oil delivery channel (23) on the second boss (221) has a second branch oil passage (231) extending towards both sides of the width of the second boss (221).

6. The fully enclosed compressor according to claim 4, characterized in that: The axial height of the first boss (312) is h1, the radial width of the first boss (312) is b1, the axial depth of the first groove (313) is h2, and the radial width of the first groove (313) is b2, 1mm≤h1≤15mm, and / or, 1mm≤b1≤15mm, and / or, 1mm≤h2≤15mm, and / or, 1mm≤b2≤15mm.

7. The fully enclosed compressor according to claim 3, characterized in that: When the cross slide (31) is assembled with the first shaft segment (21) and / or the second shaft segment (22), the single-side clearance between the first boss (312) and the second groove (211) is L1, and the single-side clearance between the first groove (313) and the second boss (221) is L2, 0<L1≤100μm, and / or, 0<L2≤100μm.

8. The fully enclosed compressor according to claim 1, characterized in that: The support flange (4) is located in a region between the motor assembly (100) and the pump body assembly (200); the motor assembly (100) comprises a stator (102), and the stator (102) is fixedly connected to the support flange (4) via a first connecting member (101); and / or the pump body assembly (200) comprises a first flange (202), and the first flange (202) is fixedly connected to the support flange (4) via a second connecting member (201).

9. The fully enclosed compressor according to claim 8, characterized in that: A first connecting column (41) is constructed on an end face of the support flange (4) facing the motor assembly (100), and the first connecting member (101) can be detachably connected to the first connecting column (41); and / or a second connecting column (42) is constructed on an end face of the support flange (4) facing the pump body assembly (200), and the second connecting member (201) can be detachably connected to the second connecting column (42).

10. The fully enclosed compressor according to claim 1, characterized in that: The support flange (4) is also provided with an axial hole (43), and the first shaft section (21) and / or the second shaft section (22) can be pivotally connected in the axial hole (43) via a bearing (5).

11. The fully enclosed compressor according to claim 1, characterized in that: The compressor is a vane compressor.

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