Scroll compressor

Abstract

The utility model provides a scroll compressor, it includes motor, compression mechanism, bearing seat and drive shaft. Compression mechanism is arranged below the axial direction of motor, the compression mechanism is structured as including fixed scroll and movable scroll, the movable scroll is engaged with fixed scroll below the axial direction of fixed scroll to define the compression cavity between movable scroll and fixed scroll. Bearing seat is suitable for axially supporting movable scroll and is arranged below the axial direction of compression mechanism. The upper shaft end of drive shaft is coupled to motor to make drive shaft can rotate under the drive of motor, drive shaft passes fixed scroll, movable scroll and bearing seat in turn from top to bottom in the axial direction. The scroll compressor with above-mentioned configuration has simple structure, lower cost and optimized gas circuit design, improves exhaust efficiency.

Description

Technical Field

[0001] This utility model relates to a compressor, and more particularly to a through-shaft scroll compressor with improvements in the layout of its internal components. Background Technology

[0002] This section provides background information related to the present invention, which does not necessarily constitute prior art.

[0003] Compressors (such as scroll compressors) can be used in, for example, refrigeration systems, air conditioning systems, and heat pump systems. Figure 1 A longitudinal cross-sectional view of a scroll compressor 100 in the prior art is shown as an example. The scroll compressor 100 includes a housing 1, and further includes a motor 2, a bearing housing 5, a moving scroll 3, a fixed scroll 4, an oil sump 7, and a drive shaft 6 arranged within the housing 1. The moving scroll 3 and the fixed scroll 4 constitute a compression mechanism. The drive shaft 6 passes through the bearing housing 5, the moving scroll 3, and the fixed scroll 4 sequentially from top to bottom in the axial direction L.

[0004] Figure 1 The blue arrows indicate the flow path of the fluid flowing from the compressor inlet into the compression mechanism, while the red arrows indicate the flow path of the fluid discharged from the exhaust port of the fixed vortex 4 after compression by the compression mechanism. Figure 1 As can be seen from the existing technology, the fixed scroll compressor 4 discharges compressed fluid downwards (i.e., towards the oil sump 7). To prevent the compressed fluid from contacting the lubricating oil in the oil sump 7, an oil isolation cover 10 needs to be added above the oil sump 7 to control oil circulation. In addition, after the compressed fluid comes into contact with the oil isolation cover 10, its flow path will turn and flow upwards. It can only be discharged from the compressor after passing through the bearing housing 5 and the motor 2 in sequence. The compressed fluid has a long travel path and a turning part before leaving the scroll compressor, which is not conducive to the high-efficiency exhaust of the scroll compressor.

[0005] Furthermore, in the prior art, due to assembly requirements, the first bearing 81, located between the drive shaft 6 and the fixed scroll 4, is typically designed with a small diameter, and is positioned closer to the drive bearing 82 located between the drive shaft 6 and the moving scroll 3. In this case, the first bearing 81 presents a significant reliability risk.

[0006] Furthermore, to ensure the stable operation of the scroll compressor, existing scroll compressors typically include, for example... Figure 1 The first balance block 91 and the second balance block 92 are arranged on both sides of the motor's axial direction. However, this arrangement requires balance blocks with large mass / size and large centrifugal force. When the compressor speed is high, the centrifugal force of the upper and lower balance blocks can easily cause the rotor shaft to bend and deform, which reduces the air gap of the motor, thereby affecting performance and also bringing risks of noise and reliability.

[0007] The above issues need to be resolved. Utility Model Content

[0008] This invention aims to solve at least one of the problems in the prior art described above. Specifically, the first technical problem this invention aims to solve is to reduce the number of parts in the scroll compressor, lower equipment costs, and further optimize the compressed gas discharge path to achieve efficient exhaust and good control of oil circulation in the scroll compressor. The second technical problem this invention aims to solve is to optimize bearing load to improve the operational reliability of the scroll compressor. The third technical problem this invention aims to solve is to reduce the influence of the centrifugal force of the balancing assembly on the rotor shaft, thereby further improving the reliability of the scroll compressor and reducing noise.

[0009] This invention provides a scroll compressor, comprising a motor, a compression mechanism, a bearing housing, and a drive shaft. The motor is designed to power the scroll compressor. The compression mechanism is arranged axially below the motor and is configured to include a stationary scroll and a moving scroll. The moving scroll engages with the stationary scroll axially below the stationary scroll to define a compression chamber between the moving scroll and the stationary scroll. The bearing housing is adapted to axially support the moving scroll and is arranged axially below the compression mechanism. The upper end of the drive shaft is connected to the motor so that the drive shaft can rotate under the drive of the motor. The drive shaft passes axially from top to bottom through the stationary scroll, the moving scroll, and the bearing housing.

[0010] By employing a scroll compressor with the above configuration, it is unnecessary to install an oil isolation shroud above the oil sump as in existing technologies. This simplifies the structure of the scroll compressor and reduces costs while ensuring proper oil circulation. Furthermore, this scroll compressor, through optimized gas path design, shortens the discharge path of the compressed fluid, and eliminates bends in the flow path, significantly improving the discharge efficiency of the compressed gas.

[0011] Preferably, the scroll compressor further includes an oil sump arranged axially below the bearing housing, with the lower end of the drive shaft extending into the oil sump.

[0012] Preferably, the drive shaft includes an eccentric journal, which engages with the moving vortex to drive the moving vortex to move. The stationary vortex includes a stationary vortex end plate, a first bearing is arranged between the stationary vortex end plate and the drive shaft, a second bearing is arranged between the moving vortex and the eccentric journal, and a third bearing is arranged between the bearing housing and the drive shaft.

[0013] Preferably, the radial dimension of the first bearing is greater than the radial dimension of the third bearing.

[0014] Preferably, the first bearing and the second bearing have a first axial distance, the second bearing and the third bearing have a second axial distance, and the first axial distance is smaller than the second axial distance.

[0015] This design allows the larger first bearing to bear a greater bearing load, while the smaller third bearing bears a smaller bearing load. By more rationally distributing the bearing load, the reliability risks of each bearing, especially the third bearing, can be effectively reduced.

[0016] Preferably, the scroll compressor is configured to further include an upper balance block and a lower balance block, the upper balance block being arranged axially above the compression mechanism and the lower balance block being arranged axially below the compression mechanism.

[0017] Preferably, the upper balance block is arranged axially above the motor and fixedly attached to the motor rotor, and the lower balance block is arranged axially below the bearing housing and fixedly sleeved on the drive shaft.

[0018] Preferably, the upper balance block is arranged between the motor and the fixed vortex and is fixedly attached to the rotor of the motor, and the lower balance block is arranged axially below the bearing housing and is fixedly sleeved on the drive shaft.

[0019] By arranging the balance blocks as described above, and since the balance blocks are located on both sides of the compression mechanism along the axial direction, the mass and size of the upper and lower balance blocks can be effectively reduced, thereby lowering the cost of the scroll compressor. On the other hand, this design reduces the centrifugal force exerted by the balance blocks on the rotor, etc., which can reduce the radial bending deformation of the rotor shaft at high speeds, thereby reducing the impact on the motor air gap, improving the noise level of the scroll compressor, and increasing its reliability.

[0020] Preferably, the scroll compressor has a housing, and the motor, the compression mechanism, the bearing housing, the drive shaft, and the oil sump are housed within the housing.

[0021] Preferably, the scroll compressor includes a single compression mechanism.

[0022] According to this invention, the through-shaft scroll compressor employs a single compression mechanism and provides a (main) bearing housing suitable for providing axial support to the compression mechanism. This allows the compression mechanism (especially the moving scroll) to obtain more stable and reliable axial support, thereby ensuring the reliable movement of the moving scroll. Attached Figure Description

[0023] The foregoing and other features and characteristics of this application will become clearer from the following detailed description with reference to the accompanying drawings, which are merely illustrative and not necessarily drawn to scale. The same reference numerals are used to indicate the same parts in different drawings, in which:

[0024] Figure 1 A longitudinal cross-sectional view of a prior art scroll compressor is shown.

[0025] Figure 2 A longitudinal cross-sectional view of a first embodiment of a scroll compressor according to the present invention is shown.

[0026] Figure 3 It shows Figure 2 Enlarged view of the area within the dashed box.

[0027] Figure 4 A longitudinal cross-sectional view of a second embodiment of the scroll compressor according to the present invention is shown.

[0028] List of reference numerals

[0029] 100. Scroll compressor; 1. Housing; 11. Shell; 12. Top cover; 13. Bottom cover; 2. Motor; 21. Rotor; 22. Stator; CM. Compression mechanism; 3. Moving scroll; 31. Moving scroll end plate; 32. Moving scroll; 33. Drive connection; 4. Fixed scroll; 41. Fixed scroll end plate; 42. Fixed scroll; 5. Bearing housing; 6. Drive shaft; 61. Upper shaft end of drive shaft; 62. Lower shaft end of drive shaft; 63. Eccentric journal; 7. Oil sump; 8. Bearing assembly; 81. First bearing; 82. Second bearing; 83. Third bearing; L. Axial; R. Radial; 9. Balancing assembly; 91. Upper balancing block; 92. Lower balancing block; 10. Oil isolation cover; M. Filter screen. Detailed Implementation

[0030] Now we will combine Figures 2 to 4 The preferred embodiments of this utility model will be described in detail below. The following description is exemplary in nature and is not intended to limit the utility model or its application or use.

[0031] Certain directional terms used in the description of the accompanying drawings below will be understood to have normal meaning and refer to those directions involved in the normal observation of the drawings, but not necessarily the orientation of the device in actual use. For example, "axial" and "radial" refer to the direction aligned with the axis of the drive shaft and the direction radiating outward from the axis of the drive shaft, respectively (these two directions can be referenced). Figure 1 The directions indicated by "L" and "R" are used to indicate directions, while "up" and "down" indicate directions. Figure 2 The top and bottom angles when viewed from different perspectives.

[0032] Figure 2 A longitudinal cross-sectional view of a first embodiment of the scroll compressor 100 according to the present invention is shown. Figure 2 As shown, the scroll compressor 100 includes a housing 11, a top cover 12 disposed at the upper shaft end of the housing 11, and a bottom cover 13 disposed at the lower shaft end of the housing 11. The housing 11, the top cover 12, and the bottom cover 13 together form the outer shell 1 of the scroll compressor 100 and define a sealed internal space within the outer shell 1. In this application, the scroll compressor 100 may be a variable speed scroll compressor.

[0033] The scroll compressor 100 is configured to also include a motor 2, a compression mechanism CM, a bearing housing 5, and an oil sump 7 arranged from top to bottom along the axial direction L within the internal space of the housing 1. These components will be described in detail below.

[0034] Motor 2 is provided to power the scroll compressor 100 to perform compression. Motor 2 is configured to include a rotor 21 and a stator 22. When motor 2 is arranged in the internal space of housing 1, stator 22 can be fixedly attached to the inner peripheral wall of housing 11, and rotor 21 can be arranged radially inside stator 22 and perform rotational motion relative to stator 22.

[0035] The compression mechanism CM includes a moving scroll 3 and a fixed scroll 4. The moving scroll 3 engages with the fixed scroll 4 from axial downward to define a compression cavity between the moving scroll 3 and the fixed scroll 4. Specifically, the fixed scroll 4 includes a fixed scroll end plate 41 and a fixed scroll 42 extending downward from the fixed scroll end plate 41 along the axial direction L. The moving scroll 3 includes a moving scroll end plate 31 and a moving scroll 32 extending upward from the moving scroll end plate 31 along the axial direction L. The moving scroll 3 also includes a drive coupling portion 33 for cooperating with the drive shaft described below. The moving scroll 32 engages with the fixed scroll 42 from axial downward. The specific meshing method and working principle of the moving scroll 3 and the fixed scroll 4 are well known to those skilled in the art and will not be described in detail herein.

[0036] The bearing housing 5 is arranged axially below the moving scroll 3. The bearing housing 5 supports the drive shaft, which will be described in detail below, and also provides a certain thrust resistance to the compression mechanism CM, especially axially supporting the moving scroll 3. Furthermore, when a cross slip ring is used, the moving scroll 3 can move relative to the stationary scroll 4 by means of the cross slip ring, and the bearing housing 5 can be used to attach the cross slip ring.

[0037] An oil sump 7 is located at the axial bottom of the interior space of the housing 1. A lubricant, such as lubricating oil, can be stored in the oil sump 7 for lubricating the various components of the scroll compressor 100. The scroll compressor 100 also includes a filter screen M disposed in the oil sump 7, which is capable of filtering oil flowing into the interior of the filter screen M from the outside.

[0038] The scroll compressor 100 also includes a drive shaft 6, through which the motor 2 transmits driving force to the compression mechanism CM. The upper end 61 of the drive shaft 6 is fixedly connected (e.g., by interference fit) to the rotor 21 so that the drive shaft 6 can rotate about its own axis of rotation under the drive of the rotor 21. The lower end 62 of the drive shaft 6 extends into the oil sump 7, particularly into the filter screen M, and a guide pipe for guiding lubricating oil can be provided at the lower end 62 of the drive shaft 6. In the illustrated embodiment, the lower end 62 for oil suction is constructed as an additional component separate from the body of the drive shaft 6, which is attached to the body of the drive shaft 6.

[0039] The scroll compressor according to this application is constructed as a so-called through-shaft scroll compressor. Specifically, the section of the drive shaft 6 located between the upper shaft end 61 and the lower shaft end 62 passes sequentially from top to bottom in the axial direction L through the aforementioned fixed scroll 4, moving scroll 3, and bearing housing 5. In this document, "through" means passing through, that is, extending from one end of the component and extending from the opposite end of the component. The drive shaft 6 has an eccentric journal 63 that engages with the moving scroll 3 (especially the drive coupling 33 of the moving scroll 3) to drive the movement of the moving scroll 3. When the drive shaft 6 rotates, the moving scroll 3 can rotate relative to the fixed scroll 4 under the drive of the eccentric journal 63 to perform the operation of compressing the working fluid between the moving scroll 3 and the fixed scroll 4.

[0040] Figure 2 The flow path of the fluid flowing from the intake port into the compression mechanism CM is still shown by blue arrows, and the flow path of the fluid discharged from the exhaust port of the fixed vortex 4 after being compressed by the compression mechanism CM is shown by red arrows. Figure 2 As can be clearly seen above, because the fixed scroll 4, moving scroll 3, and bearing housing 5 are designed to be arranged from top to bottom along the axial direction L, as detailed above, the exhaust port of the fixed scroll 4 is arranged to face upwards, i.e., exhausting upwards. In this case, the fluid flowing out of the exhaust port of the fixed scroll 4 will no longer flow directly towards the oil sump 7; the exhaust channel is separated from the oil sump 7. At the same time, the bearing housing 5 can also, to some extent, serve the function of the oil isolation cover 10 in the prior art. Therefore, the scroll compressor disclosed in this application does not need to arrange the oil isolation cover 10 above the oil sump 7 as in the prior art. This simplifies the structure of the scroll compressor and reduces costs.

[0041] Furthermore, the compressed fluid exiting the compression mechanism CM passes through the motor 2 after exiting upwards from the exhaust port of the fixed scroll compressor 4, and is then discharged from the scroll compressor 100. By optimizing the gas path design, the discharge path of the compressed fluid is shortened, and there are no longer any bends in the flow path, which greatly improves the discharge efficiency of the compressed gas.

[0042] See further Figure 3To prevent wear on the fixed scroll 4, moving scroll 3, and bearing housing 5 that may occur during the rotation of the drive shaft 6, this application provides a bearing assembly 8. The bearing assembly 8 includes a first bearing 81 arranged radially R between the fixed scroll 4 and the drive shaft 6, a second bearing 82 (also referred to herein as the drive bearing 82) arranged between the moving scroll 3 and the eccentric journal 63, and a third bearing 83 arranged between the bearing housing 5 and the drive shaft 6. In this application, the axial distance between the first bearing 81 and the second bearing 82 is referred to as the first axial distance, and the axial distance between the second bearing 82 and the third bearing 83 is referred to as the second axial distance. In this document, the axial distance between the two components refers to the axial interval between the lower axial end of the upper component and the upper axial end of the lower component.

[0043] In a preferred embodiment, the radial dimension of the first bearing 81 is designed to be larger than the radial dimension of the third bearing 83. Furthermore, the first axial spacing is designed to be smaller than the second axial spacing.

[0044] Those skilled in the art know that during compressor operation, bearings closer to the drive bearing 82 will bear greater bearing loads, while bearings farther from the drive bearing 82 will bear smaller bearing loads. In this paper, the first bearing 81, closer to the drive bearing 82, is designed to be larger, while the third bearing 83, farther from the drive bearing 82, is designed to be smaller. This allows the larger first bearing 81 to bear a greater bearing load, and the smaller third bearing 83 to bear a smaller bearing load. By more rationally distributing the bearing loads, the reliability risks of each bearing, especially the third bearing 83, can be effectively reduced.

[0045] See back Figure 2 The scroll compressor 100 also includes a balancing assembly 9. The balancing assembly 9 is configured to include an upper balancing block 91 and a lower balancing block 92. In order to solve the problems existing in the prior art mentioned above, in this application, the upper balancing block 91 is arranged axially above the compression mechanism CM, and the lower balancing block 92 is arranged axially below the compression mechanism CM.

[0046] In such Figure 2 In the first embodiment shown, the upper balance block 91 is arranged axially above the motor 2. In this case, the upper balance block 91 can be fixedly attached (e.g., by means of rivet or screw connection) to the rotor 21 of the motor 2. The lower balance block 92 is arranged axially below the bearing housing 5 and fixedly sleeved on the drive shaft 6.

[0047] Figure 4 A longitudinal cross-sectional view of a second embodiment of a scroll compressor 100 according to this application is shown. In addition to the balancing assembly 9, Figure 4 The configuration of the other components shown is similar to Figure 2They are basically the same.

[0048] Specifically, in Figure 4 In this configuration, the upper balance block 91 is positioned below the motor 2, specifically at an axial location between the motor 2 and the fixed worm gear 4, and is simultaneously fixedly attached (e.g., by means of rivet or screw connection) to the rotor 21 of the motor 2. Figure 2 As shown, the lower balance block 92 is also arranged axially below the bearing housing 5 and fixedly sleeved on the drive shaft 6.

[0049] By arranging the upper balance block 91 and the lower balance block 92 on both sides of the axial direction of the compression mechanism CM, the axial distance between the upper balance block 91 and the lower balance block 92 is increased compared with the prior art. On the one hand, this can effectively reduce the mass and size of the upper balance block 91 and the lower balance block 92, thereby reducing the cost of the scroll compressor 100. On the other hand, this design can reduce the centrifugal force exerted by the balance blocks 91 and 92 on the rotor 21, which can reduce the radial bending deformation of the rotor shaft at high speed, thereby reducing the impact on the motor air gap (especially the gap between the rotor 21 and the stator 22), improving the noise of the scroll compressor 100 and increasing its reliability.

[0050] in addition, Figure 4 The second embodiment shown is similar to Figure 2 Compared to the first embodiment shown, since the upper balance block 91 is arranged closer to the first bearing 81, the radial bending deformation of the rotor shaft at high speed can be further reduced, thereby further reducing the impact on the motor air gap.

[0051] Additionally, although not shown in the accompanying drawings, those skilled in the art will understand that, in this document, a portion of the motor 2 and the drive shaft 6 may also be located outside the housing 1 of the scroll compressor 100.

[0052] The preferred embodiments of the present invention have been described above with reference to specific examples. It is understood that the above description is exemplary and not restrictive, and various modifications and variations can be conceived by those skilled in the art without departing from the scope of the present invention. These modifications and variations are also included within the scope of protection of this application.

Claims

1. A scroll compressor characterized by, include: A motor, which is designed to power the scroll compressor; A compression mechanism is arranged axially below the motor and is configured to include a moving scroll and a stationary scroll, the moving scroll engaging the stationary scroll axially below the stationary scroll to define a compression chamber between the moving scroll and the stationary scroll. A bearing housing adapted to axially support the moving scroll and arranged axially below the compression mechanism; as well as A drive shaft, the upper end of which is connected to the motor so that the drive shaft can rotate under the drive of the motor, the drive shaft passing through the fixed volute, the moving volute and the bearing housing in the axial direction from top to bottom.

2. The scroll compressor of claim 1, wherein The scroll compressor also includes an oil sump arranged axially below the bearing housing, with the lower end of the drive shaft extending into the oil sump.

3. The scroll compressor of claim 1, wherein The drive shaft includes an eccentric journal, which engages with the moving vortex to drive the moving vortex to move. The stationary vortex includes a stationary vortex end plate. A first bearing is arranged between the stationary vortex end plate and the drive shaft. A second bearing is arranged between the moving vortex and the eccentric journal. A third bearing is arranged between the bearing housing and the drive shaft.

4. The scroll compressor of claim 3, wherein The radial dimension of the first bearing is greater than that of the third bearing.

5. The scroll compressor of claim 4, wherein, The first bearing and the second bearing have a first axial distance, and the second bearing and the third bearing have a second axial distance, wherein the first axial distance is less than the second axial distance.

6. The scroll compressor according to any one of claims 1 to 5, wherein The scroll compressor is configured to further include an upper balance block and a lower balance block, the upper balance block being arranged axially above the compression mechanism and the lower balance block being arranged axially below the compression mechanism.

7. The scroll compressor of claim 6, wherein The upper balance block is arranged axially above the motor and fixedly attached to the motor rotor, while the lower balance block is arranged axially below the bearing housing and fixedly sleeved on the drive shaft.

8. The scroll compressor according to claim 6, characterized in that, The upper balance block is arranged between the motor and the fixed vortex and is fixedly attached to the rotor of the motor, while the lower balance block is arranged axially below the bearing housing and is fixedly sleeved on the drive shaft.

9. The scroll compressor according to claim 2, characterized in that, The scroll compressor has a housing, within which the motor, the compression mechanism, the bearing housing, the drive shaft, and the oil sump are housed.

10. The scroll compressor according to any one of claims 1 to 5, characterized in that, The scroll compressor includes a single compression mechanism.

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