Compressor

Abstract

The invention discloses a compressor. A compressor including a filter through which the lubricant separated from the compressed refrigerant passes; and a lubricant circuit connected to the filter, the lubricant circuit comprising: a first channel connected to an outlet of the filter; a second passage connected to an outlet of the filter to divert from the first passage, the second passage leading to a low pressure region of a compression chamber, the first passage and the second passage passing through a static scroll; the third channel penetrates through the middle disc, one end of the third channel is connected with the first channel, and the other end of the third channel leads to a back pressure chamber; the back pressure chamber is further connected with the compression chamber through a throttling channel. According to the invention, sufficient back pressure and a good lubricating effect are provided.

Description

Technical Field

[0001] The present application relates to a compressor in which a refrigerant is pressurized. Background Art

[0002] A movable scroll and a fixed scroll are provided in a scroll compressor. The movable scroll is driven by an eccentric shaft to revolve relative to the fixed fixed scroll without rotating, thereby forming a compression chamber for compressing the fluid between the movable scroll and the fixed scroll. The movable scroll has a back pressure chamber on the side opposite to the fixed scroll. The pressure of the compression chamber applies a compression thrust to the movable scroll, and the pressure of the back pressure chamber applies a back pressure thrust to the movable scroll. During the operation of the compressor, the pressure of the compression chamber and the pressure of the back pressure chamber are respectively dynamically changed. When there is a difference in the size of the compression thrust and the back pressure thrust, thrust imbalance occurs. For example, when the compression thrust is greater than the back pressure thrust, the end of the movable scroll will be out of contact with the fixed scroll and leak the compressed fluid. The working efficiency of the compressor is reduced. For another example, when the compression thrust is less than the back pressure thrust, the movable scroll will be pushed by the back pressure thrust so that the end of the movable scroll is close to the fixed scroll. When the compression thrust is much less than the back pressure thrust, the friction between the movable scroll and the fixed scroll is too large. The efficiency of the compressor will also be reduced.

[0003] The lubrication system of the compressor provides lubricant to the rotating parts to reduce the friction and loss of the machine. A part of the lubricant participates in the compression process along with the refrigerant, and then is separated and recycled, so as to circulate in the lubrication system to participate in the next compression process. A separator is set in the compressor. Depending on the working efficiency of the separator, most of the lubricant is separated from the compressed refrigerant through the separator. A small amount of lubricant and refrigerant leave the compressor and flow into the refrigeration circuit. Summary of the invention

[0004] One aspect of the present application is to provide a compressor in which a lubricant provides back pressure.

[0005] The compressor comprises a shell having a receiving chamber; a fixed scroll fixed in the receiving chamber, the fixed scroll having a fixed scroll wall and a discharge port through which the refrigerant passes; an intermediate disk fixed in the receiving chamber and relative to the fixed scroll; a movable scroll located between the fixed scroll and the intermediate disk, the movable scroll having a movable scroll wall, the side surface of the movable scroll wall meshing with the side surface of the fixed scroll wall, a compression chamber in which the refrigerant is pressurized is formed between the movable scroll wall and the fixed scroll wall, and the compression chamber is connected to the discharge port; a back pressure chamber located between the movable scroll and the intermediate disk; a filter, the filter passes through the compressed refrigerant The compressor further comprises a lubricant circuit connected to the filter, the lubricant circuit comprising: a first channel, the first channel being connected to the outlet of the filter; a second channel, the second channel being connected to the outlet of the filter to divert flow from the first channel, the second channel leading to the low-pressure area of ​​the compression chamber, the first channel and the second channel passing through the fixed vortex disk; a third channel, the third channel passing through the intermediate disk, one end of the third channel being connected to the first channel, and the other end leading to the back-pressure chamber; and the back-pressure chamber is also connected to the compression chamber via a throttling channel.

[0006] In an embodiment of the compressor, the lubricant circuit further includes a fourth channel connected to the first channel and the third channel for regulating the flow of the lubricant, and the fourth channel is disposed on an end surface of the intermediate disk facing the fixed scroll disk.

[0007] The fourth channel can further adjust the pressure of the lubricant flow entering the back pressure chamber, and it serves as a connecting channel between the first channel and the third channel, so that the positions of the latter two on the fixed vortex plate and the intermediate plate are not restricted.

[0008] In an embodiment of the compressor, the first channel, the second channel, and the third channel are configured as straight channels; and the fourth channel is configured as an arc-shaped channel.

[0009] In one embodiment of the compressor, the static volute has a first surface away from the main shaft axis of the compressor and facing the side of the movable volute, and a first opening is provided on the first surface, the first opening is connected to the second channel, the first opening is closed when the movable volute approaches the first surface, and is opened when the movable volute leaves the first surface. The opening and closing of the first opening during the compression process provides a changing pressure for the first channel.

[0010] In one embodiment of the compressor, the static scroll wall has a second surface facing the movable scroll and forming a part of the compression chamber, and a second opening is arranged on the second surface, and the second opening is connected to the second channel, so that moderate pressure control of the back pressure chamber can be obtained.

[0011] In an embodiment of the compressor, the static scroll wall has a third surface facing the intermediate disk and in contact with the intermediate disk, a third opening is provided on the third surface, and the third opening is communicated with the first passage.

[0012] In one embodiment of the compressor, the first channel and the second channel extend in opposite directions at the outlet of the filter, and the first channel further includes a first branch along the main shaft axis of the compressor and a second branch intersecting the first branch, wherein the second branch leads to the outer surface of the fixed scroll and a plug is arranged therein to separate the first channel and the second channel from the outside of the fixed scroll.

[0013] In one embodiment of the compressor, the diameter of the second passage is sized such that a greater amount of lubricant flowing through the outlet of the filter flows toward the first passage than the second passage.

[0014] In one embodiment of the compressor, the filter is accommodated in a receiving cavity extending along the axis of the main shaft of the compressor and away from the axis.

[0015] In one embodiment of the compressor, the back pressure chamber is defined by the movable scroll, the intermediate disk, and an anti-rotation pad between the movable scroll and the intermediate disk; the compressor has a main shaft and an eccentric shaft, the main shaft is installed on the intermediate disk side of the back pressure chamber through a first bearing, and the eccentric shaft is installed on the movable scroll side of the back pressure chamber through a bushing and a second bearing.

[0016] The back pressure chamber is pressurized by the lubricant, and the parts to be lubricated in the back pressure chamber are fully lubricated at the same time. The storage chamber receives the lubricant from the compressed refrigerant, providing sufficient pressure for the back pressure chamber and the pressure is stable. The stable back pressure can improve the tilt risk of the movable scroll, thereby improving the NVH performance and service life. The filter also prevents impurities in the lubricant from entering the back pressure chamber, ensuring a good lubrication effect.

[0017] The filtered lubricant is divided into the first channel and the second channel. On the one hand, by designing the diameter size of the second channel, a certain amount of lubricant flows into the back pressure chamber from the first channel without limiting the diameter of the first channel. On the other hand, the second channel also avoids excessive pressure in the first channel, and there is no need to set a pressure reducing valve.

[0018] Other aspects and features of the present application will become apparent from the following detailed description with reference to the accompanying drawings. It should be understood, however, that the drawings are designed for illustrative purposes only and are not intended to limit the scope of the present application, as reference should be made to the appended claims. It should also be understood that the drawings are intended only to conceptually illustrate the structures and processes described herein and, unless otherwise indicated, are not necessarily drawn to scale. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The present application will be more fully understood by referring to the following detailed description of specific embodiments in conjunction with the accompanying drawings, in which the same reference numerals in the drawings always refer to the same elements in the drawings.

[0020] Figure 1 A schematic diagram showing a partial appearance of a compressor involved in the present application;

[0021] Figure 2 A partial cross-sectional view showing a compressor according to an embodiment of the present application;

[0022] Figure 3 A partial cross-sectional view showing another embodiment of a compressor according to the present application;

[0023] Figure 4 Show Figure 3 A top view of the intermediate disk in the embodiment involved;

[0024] Figure 5 Show Figure 3 Another cross-sectional view of a portion of a compressor according to an embodiment of the present invention;

[0025] Figure 6 A schematic diagram showing an embodiment of a second channel of a compressor involved in the present application;

[0026] Figure 7 Show Figure 6 A state of the second channel in the embodiment involved;

[0027] Figure 8 Show Figure 6 Another state of the second channel in the embodiment involved;

[0028] Fig. 9 A schematic diagram showing another embodiment of the second passage of the compressor involved in the present application; and

[0029] Fig.10 A schematic diagram showing yet another embodiment of the first channel and the second channel of the compressor involved in the present application. DETAILED DESCRIPTION

[0030] In order to help those skilled in the art to accurately understand the subject matter for which protection is sought in the present application, the specific implementation of the present application is described in detail below in conjunction with the accompanying drawings.

[0031] Figure 1-2 It is a cross-sectional schematic diagram of an embodiment of the compressor involved in the present application. The compressor includes a shell 10. The shell 10 defines a receiving chamber. The compressor further includes a fixed scroll 12, an intermediate disk 26, a main shaft 28 and a movable scroll 32. The fixed scroll 12 and the intermediate disk 26 are respectively fixed in the receiving chamber and are opposite to each other. The fixed scroll 12 has an integral fixed base plate 14 and a fixed scroll wall 16. The fixed scroll wall 16 extends from a position close to the axis X" of the fixed scroll around the axis in a direction away from the axis X". A discharge port 18 is provided at the center of the fixed base plate 14. The movable scroll 32 is installed between the fixed scroll 12 and the intermediate disk 26. The movable scroll 32 has an integral movable base plate 34 and a movable scroll wall 36. The movable scroll wall 36 extends from a position close to the axis X' of the movable scroll around the axis in a direction away from the axis X'. The axis X' of the movable scroll is offset from the axis X" of the fixed scroll.

[0032] The movable volute 36 has an end face 38 and two side faces 40. The side faces 40 of the movable volute 36 are substantially parallel to the axial direction. The side faces of the movable volute 36 mesh with the side faces of the stationary volute 16, and the end faces 38 of the movable volute 36 are in sliding contact with the stationary base plate 14. A compression chamber 44 is formed between the movable scroll 36 and the stationary scroll 12, and the compression chamber 44 is connected to the discharge port 18. A back pressure chamber 46 is formed between the intermediate disk 26 and the movable scroll 32. A suction chamber is provided in the housing 10. The suction chamber is connected to the space outside the movable scroll 32 and the stationary scroll 12. When the motor shaft of the compressor rotates around the axis X, the movable scroll 32 eccentrically arranged on the main shaft 28 is driven to rotate relative to the fixed scroll 12, and the refrigerant fluid is sucked from the periphery of the movable scroll 32 and the fixed scroll 12 into the compression chamber 44 between the movable scroll 32 and the fixed scroll 12. As the compressor rotates, the compression chamber 44 moves from the periphery to the center and the volume gradually decreases. The refrigerant in the compression chamber 44 is gradually pressurized, and finally the high-pressure refrigerant fluid is discharged from the discharge port 18 at the center of the movable scroll 32 and the fixed scroll 12. This cycle is repeated to achieve continuous vortex compression. It can be seen that the pressure of the refrigerant in the compression chamber 44 is dynamically variable, and the pressure of the refrigerant in the compression chamber 44 usually increases gradually from the periphery to the center.

[0033] The compression chamber 44 and the back pressure chamber 46 provide opposite thrusts to the movable scroll 32. Figure 2As shown, the refrigerant in the compression chamber 44 applies pressure to the movable scroll 32 from top to bottom, and the fluid in the back pressure chamber 46 applies pressure to the movable scroll 32 from bottom to top. The movable scroll 32 contacts the fixed scroll 12 under the back pressure to prevent refrigerant leakage. When the pressure in the compression chamber 44 is too large to cause the movable scroll 32 to move downward away from the fixed scroll 12, the back pressure can push the movable scroll 32 back until the pressure on both sides of the movable scroll 32 reaches equilibrium.

[0034] The fluid in the back pressure chamber 46 uses a lubricant, such as oil. The back pressure chamber 46 is arranged on the lubricant circuit. A storage chamber 48 for the lubricant is arranged in the housing 10, and the storage chamber 48 is connected to a separator 50. Figure 2 The storage chamber 48 and the separator 50 are shown in a simplified manner. The compressed refrigerant entering the discharge port 18 is then introduced into the separator 50, such as a cyclone separator. The lubricant carried in the refrigerant is thrown out under the high-speed operation of the separator 50. After passing through the separator 50, the refrigerant leaves the compressor and enters the refrigeration circuit. The separated lubricant is collected by the storage chamber 48. The storage chamber 48 is further connected to the filter 52. The fixed scroll 12 is provided with a receiving chamber 20 extending in the axial direction and arranged on one side of the fixed scroll 12 away from the axis, and the filter 52 of a can-shaped structure is inserted therein. A first channel 62 is provided at the bottom of the receiving chamber 20, that is, at the outlet 54 of the filter. A second channel 64 is also provided at the outlet 54 of the filter to divert the lubricant passing through. The second channel 64 leads to the low-pressure area of ​​the compression chamber 44. Both the first channel 62 and the second channel 64 pass through the fixed scroll 12. A portion of the lubricant passes through the first channel 62. The other portion of the lubricant flows into the compression chamber 44 via the second channel 64. A third channel 66 is provided in the intermediate disk 26, one end of the third channel 66 is connected to the first channel 64 to receive the lubricant, and the other end is connected to the back pressure chamber 46, so that the lubricant flows into the back pressure chamber 46. The back pressure chamber 46 is also connected to a throttling channel (not shown in the figure) to return the lubricant to the compression chamber 44. Whether the lubricant passes through the first channel 62, the third channel 66, the throttling channel in sequence, or the lubricant passes through the second channel 64, it eventually returns to the compression chamber 44, and then is pressurized together with the refrigerant, and is introduced into the separator 50 again at the discharge port 18.

[0035] The back pressure chamber 46 is defined by a cavity surrounded by the movable scroll 32, the intermediate disk 26, and the anti-rotation pad 72 between the movable scroll and the intermediate disk 26. The main shaft 28 passes through the back pressure chamber 46, and the main shaft 28 is installed at the intermediate disk side of the back pressure chamber 46 through the first bearing 74. The main shaft 28 is also provided with an eccentric shaft 30, and the eccentric shaft 30 is installed at the movable scroll side of the back pressure chamber 46 through the bushing 76 and the second bearing 78. The axis of the eccentric shaft 30 is aligned with the axis X' of the movable scroll. The main shaft 28 rotates to drive the movable scroll 32 to rotate. The anti-rotation pad 72, also known as the wear-resistant pad, is sandwiched between the movable scroll 32 and the intermediate disk 26, and can prevent the orbital revolution of the movable scroll 32. The lubricant provided by the back pressure chamber 44 is applied to the first bearing 74, the eccentric shaft 30, the second bearing 78 and other parts that need lubrication. Since the lubricant has been filtered to remove impurities and foreign matter, it is friendly to these lubricated parts to obtain a good lubrication effect.

[0036] In the lubricant circuit, the first passage 62 , the second passage 64 and the third passage 66 are all configured as straight passages to facilitate processing, save pipeline length and avoid excessive pressure drop.

[0037] In addition, the diameter of the second channel 64 can be designed to obtain the desired diversion effect. The second channel 64 is designed to increase the flow rate of the lubricant flowing into the first channel 62 to ensure that most of the lubricant is diverted to the flow path that supplies pressure to the back pressure chamber 46. When the second channel 64 is dimensioned, there is no need to further design the first channel 62 and the third channel 66, and the diameters of the latter two can be as large as possible.

[0038] Figure 3-5 Another embodiment of the lubricant circuit of the compressor involved in the present application is shown. In this embodiment, all the features and Figure 1-2 The embodiment of the present invention is the same as that of the present invention, except that a fourth channel 68 is added between the first channel 62 and the third channel 66. The lubricant passing through the first channel 62 then passes through the fourth channel 68 and enters the third channel 66. The fourth channel 68 is arranged on the end surface 27 of the intermediate disk 26 facing the fixed scroll disk 12 and extends around the axis. In this embodiment, the fourth channel 68 is connected between the first channel 62 and the third channel 66 as a connector. Therefore, the first channel 62 and the third channel 66 can be staggered. Designing the width, i.e., the diameter and depth of the fourth channel 68 can further adjust the flow rate of the lubricant flowing into the back pressure chamber 46. Figure 4 Also shown is a throttle hole 70 connected to the back pressure chamber 46. The lubricant in the back pressure chamber 46 returns to the compression chamber 44 via the throttle hole 70.

[0039] Figure 6An embodiment of the second channel of the lubricant circuit of the compressor involved in the present application is shown. The fixed scroll 12 has a first surface 82 away from the main shaft axis and facing the side of the movable scroll 32, the first surface 82 is substantially along the axial direction and further has a first opening 83 to connect with the second channel 64. During the rotation of the movable scroll 32, the first opening 83 has an open state and a closed state. Figure 7 The first opening 83 is shown in an open state, where the movable scroll wall 36 leaves the first surface 82 . Figure 8 The first opening 83 is shown in a closed state, when the movable volute 32 contacts the first surface 82. The first opening 83 provides the first passage 62 with a variable lubricant flow pressure. When the first opening 83 is closed, the lubricant passing through the filter enters the first passage 62, so the supply pressure is sufficient.

[0040] Fig. 9 Another embodiment of the second passage of the lubricant circuit of the compressor involved in the present application is shown. The fixed scroll wall 12 has a second surface 84 facing the end surface of the movable scroll 32, the second surface 84 substantially intersects the axis, and constitutes a part of the compression chamber 44. The second surface 84 further has a second opening 85 to connect with the second passage 64.

[0041] exist Figure 6 and Fig. 9 In the embodiment of the present invention, the fixed scroll 12 also has a third surface 86 facing the end surface 27 of the intermediate disk 26. The third surface 86 is the end surface of the fixed scroll 12 and contacts the intermediate disk 26. The third surface 86 has a third opening 87 to connect with the first channel 62. The first channel 62 extends obliquely from the outlet 54 of the filter to the third opening 87.

[0042] Fig.10 FIG. 2 shows another embodiment of the first channel and the second channel of the lubricant circuit of the compressor involved in the present application. The first channel 62 and the second channel 64 extend in opposite directions at the outlet 54 of the filter. The second channel 64 leads to the first surface 82 and is arranged in the same manner as the aforementioned Figure 7-8 The lubricant is transported in a manner similar to the embodiment shown in FIG. The first channel 62 is further divided into a first branch 79 along the axial direction and a second branch 80 intersecting the first branch 79. The lubricant flows into the first branch 79 through the diversion and enters the intermediate disk. The second branch 80 leads to the outer surface 21 of the fixed scroll 12, and a plug 22 is provided therein to isolate the first channel 62 and the second channel 64 from the outside of the fixed scroll 12. This embodiment provides the convenience of processing multiple channels in the fixed scroll 12.

[0043] Although specific embodiments of the present application have been shown and described in detail to illustrate the principles of the present application, it should be understood that the present application can be implemented in other ways without departing from such principles.

Claims

1. A compressor, Its characteristics are include: A housing (10), wherein the housing (10) has a receiving cavity; A stationary vortex (12) fixed in the receiving chamber, wherein the stationary vortex (12) has a stationary vortex wall (16) and a discharge port (18) through which refrigerant passes; An intermediate disk (26) fixed in the receiving chamber and opposite to the static scroll disk (12); a movable scroll (32) located between the fixed scroll (12) and the intermediate disk (26), the movable scroll (32) having a movable scroll wall (36), the side surface of the movable scroll wall (36) meshing with the side surface of the fixed scroll wall (16), a compression chamber (44) in which the refrigerant is pressurized is formed between the movable scroll wall (36) and the fixed scroll wall (16), and the compression chamber (44) is connected to the discharge port (18); a back pressure chamber (46) located between the movable scroll (32) and the intermediate disk (26); a filter (52) for passing a lubricant separated from a compressed refrigerant; as well as A lubricant circuit connected to the filter (52), the lubricant circuit comprising: a first channel (62), the first channel (62) being connected to an outlet (54) of the filter; a second passage (64), the second passage (64) being connected to the outlet (54) of the filter to branch off from the first passage (62), the second passage (64) leading to a low-pressure area of ​​the compression chamber (44), the first passage (62) and the second passage (64) passing through the fixed scroll (12); a third channel (66), the third channel (66) passing through the intermediate disk (26), one end of the third channel (66) being connected to the first channel (62) and the other end of the third channel (66) leading to the back pressure chamber (46); and The back pressure chamber (46) is also connected to the compression chamber (44) via a throttling passage.

2. The compressor according to claim 1, Its characteristics are: The lubricant circuit further includes a fourth channel (68) connected to the first channel (62) and the third channel (66) for regulating the flow rate of the lubricant, and the fourth channel (68) is arranged on the end surface (27) of the intermediate disk (26) facing the fixed scroll (12).

3. The compressor according to claim 2, Its characteristics are: The first channel (62), the second channel (64), and the third channel (66) are configured as straight channels; and the fourth channel (68) is configured as an arc-shaped channel.

4. The compressor according to claim 1, Its characteristics are: The static volute (12) has a first surface (82) which is away from the main shaft axis of the compressor and faces the side of the movable volute (32), and a first opening (83) is provided on the first surface (82). The first opening (83) is connected to the second channel (64), and the first opening (83) is closed when the movable volute (36) approaches the first surface (82), and is opened when the movable volute (36) leaves the first surface (82).

5. The compressor according to claim 1, Its characteristics are: The fixed scroll wall (16) has a second surface (84) facing the movable scroll (32) and forming a part of the compression chamber (44), and a second opening (85) is provided on the second surface (84), and the second opening (85) is connected to the second passage (64).

6. The compressor according to claim 1, Its characteristics are: The static scroll wall (16) has a third surface (86) facing the intermediate disk (26) and in contact with the intermediate disk (26), and a third opening (87) is provided on the third surface (86), and the third opening (87) is connected to the first passage (62).

7. The compressor according to claim 1, Its characteristics are: The first channel (62) and the second channel (64) extend in opposite directions at the outlet (54) of the filter, and the first channel (62) further includes a first branch (79) along the main shaft axis of the compressor and a second branch (80) intersecting the first branch (79), wherein the second branch (80) leads to the outer surface (21) of the fixed scroll (12), and a plug (22) is arranged therein to separate the first channel (62) and the second channel (64) from the outside of the fixed scroll (12).

8. The compressor according to claim 1, Its characteristics are: The diameter of the second passage (64) is sized so that the flow rate of lubricant passing through the outlet (54) of the filter flows more toward the first passage (62) than the second passage (64).

9. The compressor according to claim 1, Its characteristics are: The filter (52) is accommodated in a receiving chamber (20) extending along the axis of the main shaft of the compressor and away from the axis.

10. The compressor according to claim 1, Its characteristics are: The back pressure chamber (46) is defined by the movable scroll (32), the intermediate disk (26), and an anti-rotation pad (72) between the movable scroll (32) and the intermediate disk (26); the compressor has a main shaft (28) and an eccentric shaft (30), the main shaft (28) is installed on the intermediate disk side of the back pressure chamber (44) through a first bearing (74), and the eccentric shaft (30) is installed on the movable scroll side of the back pressure chamber (44) through a bushing (76) and a second bearing (78).

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