A pump assembly and compressor with drainage structure

Abstract

The present invention relates to the technical field of compressors, and discloses a pump assembly and a compressor with a drainage structure, wherein the upper end surface of the base is downwardly formed with a first groove and a first through hole for the circulation of refrigeration oil, and the first groove is connected to the first through hole. The pump assembly includes an upper support and an oil shield, and the middle part of the baffle is upwardly formed with a first cover body for being sleeved on the outer periphery of the sleeve, and the lower surface of the baffle is connected to the upper end surface of the base and covers the first groove and the first through hole, and the first cover body is formed by a first connecting surface and a second connecting surface, the first connecting surface is tightly attached to the sleeve, and there is a gap between the second connecting surface and the sleeve, and the gap is connected to the first groove; the present invention has the following technical effects: preventing a large amount of refrigeration oil from being atomized and discharged from the compressor, thereby improving the energy efficiency of the refrigeration system and the reliability of the compressor.

Description

Technical Field

[0001] The present invention belongs to the technical field of compressors, and in particular relates to a pump assembly with a drainage structure and a compressor. Background Art

[0002] Usually, a rotary compressor is composed of a pump assembly, a motor assembly, a casing assembly, refrigeration oil, a filter bottle and other components. Among them, the pump assembly is composed of an upper support, a cylinder, a rotating shaft, spiral vanes, a ring and a silencer. When the compressor is working, the refrigeration oil is sucked in from the lower part of the rotating shaft, flows into the pump through the oil hole of the rotating shaft, and finally flows out from the gap between the upper support and the rotating shaft, passes through the outer periphery of the shaft sleeve of the upper support, and flows to the refrigerant exhaust port. After combining with the gaseous refrigerant discharged from the exhaust port, it is atomized to form a mixture. After the mixture passes through the refrigerant channel of the motor assembly, part of the refrigeration oil is discharged from the compressor along with the refrigerant.

[0003] However, a large amount of refrigeration oil is discharged from the compressor along with the refrigerant and reaches the condenser, seriously affecting its heat exchange efficiency and reducing the energy efficiency of the entire machine. At the same time, insufficient refrigeration oil causes the pump to be unable to be lubricated, and in severe cases, it causes the pump to get stuck and damage the compressor. Summary of the Invention

[0004] In order to address the deficiencies of the prior art, the present invention provides a pump assembly and a compressor with a drainage structure, which prevents a large amount of refrigeration oil from being atomized and discharged from the compressor, thereby improving the energy efficiency of the refrigeration system and the reliability of the compressor.

[0005] The technical objectives to be achieved by the present invention are achieved through the following technical solutions:

[0006] The present invention provides a pump assembly with a drainage structure, the pump assembly comprising an upper support and an oil shield;

[0007] The upper support includes a base, a shaft sleeve for the rotation shaft to pass through is formed upward in the middle of the base, and a first groove and a first through hole for the circulation of refrigeration oil are formed downward on the upper end surface of the base, and the first groove is connected to the first through hole;

[0008] The oil shield includes a baffle, a first cover body is formed upwardly in the middle of the baffle for being sleeved on the outer periphery of the shaft sleeve, the lower surface of the baffle is connected to the upper end surface of the base and covers the first groove and the first through hole;

[0009] The first cover body is formed by enclosing a first connecting surface and a second connecting surface. The first connecting surface is in close contact with the shaft sleeve. There is a gap between the second connecting surface and the shaft sleeve, and the gap is connected to the first groove.

[0010] In some implementations, the upper end of the first cover body is higher than the upper end of the sleeve, so as to better shield the refrigeration oil flowing out between the rotating shaft and the sleeve, so that the refrigeration oil flowing out through the upper end of the sleeve will not overflow to the outside of the first cover body, reducing the amount of refrigeration oil atomization, thereby reducing the oil discharge amount.

[0011] In some implementations, a second groove is formed on the upper end surface of the sleeve relative to the second connecting surface for drawing out the refrigeration oil between the rotating shaft and the sleeve, so that the refrigeration oil flows into the second groove and enters the gap between the second connecting surface and the first cover body from the second groove, thereby having a better drainage effect on the refrigeration oil.

[0012] In some implementations, a drainage slope is formed between the lower end of the outer surface of the sleeve and the first groove, so that the refrigeration oil can be drained into the first groove through the drainage slope, thereby achieving a better drainage effect.

[0013] In some implementations, the first groove is an annular groove, and there are multiple first through holes, all of which are connected to the annular groove to perform multi-porous drainage of the refrigeration oil. At the same time, the layout area of ​​the annular groove also plays a heat insulation role.

[0014] In some implementations, a third groove is formed downwardly on the upper end surface of the base, and a second through hole for passing the refrigerant is formed at the bottom of the third groove;

[0015] The baffle is formed with a third through hole at a position corresponding to the third groove, so that the refrigerant can enter the silencer cover through the third through hole to perform a silencing effect.

[0016] In some implementations, the first groove and the third groove are located on opposite sides of the sleeve, so that the refrigeration oil flowing through the first groove plays a heat insulating role, avoids the transfer of high-temperature exhaust gas, reduces the suction specific volume, and thus improves the performance of the compressor.

[0017] In some implementations, the pump assembly further includes a silencer cover and a cylinder body, wherein the silencer cover is connected to the upper surface of the baffle, and the cylinder body is connected to the lower end surface of the base;

[0018] A fourth through hole is formed on the cylinder body at a position corresponding to the first through hole, and the fourth through hole is connected to the first through hole to drain the refrigeration oil to the bottom of the compressor.

[0019] In some implementations, the soundproof cover includes a panel, and a second cover body is formed upwardly from a middle portion of the panel;

[0020] The lower surface of the panel is sealed to the upper surface of the baffle, and the second cover is arranged above the third through hole to silence the refrigerant gas discharged through the third through hole.

[0021] The present invention also provides a compressor comprising a housing and a pump assembly as described above, wherein the pump assembly is installed in the housing. The pump assembly used has a drainage structure, which effectively improves the energy efficiency and operational reliability of its refrigeration system.

[0022] In summary, the present invention has at least the following benefits:

[0023] 1. The present invention provides a pump assembly with a drainage structure. By setting an oil shield, the refrigeration oil flows out from between the rotating shaft and the sleeve, and then flows back to the bottom of the compressor through the gap, the first groove and the first through hole that are connected in sequence, avoiding flowing to the refrigerant exhaust port, reducing the amount of refrigeration oil atomization, and thus reducing the oil discharge amount; and the refrigeration oil flows through the first groove and is located on the upper end surface of the base, which plays a heat insulating role, avoids the transmission of high-temperature exhaust gas, reduces the suction specific volume, and thus improves the performance of the compressor.

[0024] 2. The present invention provides a compressor that, after applying a pump assembly with a drainage structure, can improve the energy efficiency and operational reliability of its refrigeration system. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 Schematic diagram of the structure of the pump assembly according to embodiment 1 of the present invention;

[0026] Figure 2 An exploded view of the pump assembly according to Example 1 of the present invention;

[0027] Figure 3 Schematic diagram of the structure of the upper support of Example 1 of the present invention;

[0028] Figure 4 This is a schematic structural diagram of the oil shield according to Example 1 of the present invention;

[0029] Figure 5 A top view of the pump assembly according to embodiment 1 of the present invention;

[0030] Figure 6 for Figure 5 Cross-sectional view in the AA direction;

[0031] Figure 7 Schematic diagram of the structure of the pump assembly according to embodiment 2 of the present invention;

[0032] Figure 8 Schematic diagram of the structure of the upper support of Example 2 of the present invention;

[0033] Figure 9This is a schematic structural diagram of an oil shield according to embodiment 2 of the present invention;

[0034] Figure 10 This is a schematic structural diagram of a cylinder body according to embodiment 2 of the present invention;

[0035] Figure 11 This is a schematic structural diagram of a soundproof cover according to embodiment 2 of the present invention;

[0036] Figure 12 Schematic diagram of a compressor according to embodiment 3 of the present invention;

[0037] 100. Pump assembly;

[0038] 200, upper support; 210, base; 220, sleeve; 230, first groove; 240, first through hole; 250, second groove; 260, drainage slope; 270, third groove; 280, second through hole;

[0039] 300, oil shield; 310, baffle; 320, first shield; 321, first connecting surface; 322, second connecting surface; 330, third through hole;

[0040] 400, gap;

[0041] 500, muffler cover; 510, panel; 520, second cover;

[0042] 600, cylinder body; 610, fourth through hole;

[0043] 700. Compressor. DETAILED DESCRIPTION

[0044] To make the purpose, technical solutions and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. The described embodiments are only part of the embodiments of the present invention, not all of the embodiments.

[0045] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention as claimed, but rather merely represents selected embodiments of the present invention. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without creative effort are also within the scope of protection of the present invention.

[0046] Example 1:

[0047] See Figures 1-6 , a pump assembly with a drainage structure, the pump assembly 100 includes an upper support 200 and an oil shield 300.

[0048] See also Figure 1-Figure 3 The upper support 200 includes a base 210, and a sleeve 220 for the rotating shaft to pass through is formed upward in the middle of the base 210. A first groove 230 and a first through hole 240 for the circulation of refrigeration oil are formed downward on the upper end surface of the base 210. The first groove 230 is connected to the first through hole 240, and the first through hole 240 passes through the lower end surface of the base 210 so that the refrigeration oil can flow out through the first through hole 240.

[0049] Combined with the background technology content, it can be understood that when the compressor is working, the refrigeration oil is sucked in from the lower part of the shaft, flows into the pump through the oil hole of the shaft, and finally flows out from the gap between the upper support 200 and the shaft, through the outer periphery of the sleeve 220 of the upper support 200, and flows to the refrigerant exhaust port. In this embodiment, a first groove 230 and a first through hole 240 for the circulation of refrigeration oil are formed downward on the upper end surface of the base 210 to prevent the refrigeration oil from flowing to the refrigerant exhaust port, but instead flow to the bottom of the compressor through the first groove 230 and the first through hole 240.

[0050] See also Figure 4-Figure 6 The oil shield 300 includes a baffle 310, and a first cover body 320 is formed upward in the middle of the baffle 310 for being sleeved on the outer periphery of the sleeve 220. The lower surface of the baffle 310 is connected to the upper end surface of the base 210 and covers the first groove 230 and the first through hole 240.

[0051] It can be seen that the sleeve 220 is a hollow structure with two openings arranged opposite to each other, and the first cover body 320 is sleeved on the outer periphery of the sleeve 220, that is, the structure of the first cover body 320 is the same as that of the sleeve 220, and the first cover body 320 is also a hollow structure with two openings arranged opposite to each other. More specifically, the first cover body 320 is formed by enclosing a first connecting surface 321 and a second connecting surface 322, and the first connecting surface 321 is close to the sleeve 220, and there is a gap 400 between the second connecting surface 322 and the sleeve 220, and the gap 400 is connected to the first groove 230.

[0052] The first connecting surface 321 and the second connecting surface 322 are both curved surfaces. Two opposite sides of the first connecting surface 321 are respectively connected to two opposite sides of the second connecting surface 322 to enclose and form the first cover body 320 with a hollow structure.

[0053] In one example, the sleeve 220 is a hollow cylindrical structure, and the first connecting surface 321 and the second connecting surface 322 are semicircular surfaces with different radii, wherein the first connecting surface 321 is close to the sleeve 220, which is equivalent to the center of the first connecting surface 321 and the center of the sleeve 220 being concentric, and there is a gap 400 between the second connecting surface 322 and the sleeve 220, which is equivalent to the center of the second connecting surface 322 and the center of the sleeve 220 being non-concentric.

[0054] The first cover body 320 of the oil shield 300 is designed to have a non-concentric relationship with the sleeve 220, that is, there is an eccentric structure. During the operation of the compressor, the refrigeration oil is sucked from the lower part of the shaft, flows into the pump through the oil hole of the shaft, and finally flows out from the gap between the upper support 200 and the shaft. The first connecting surface 321 is close to the sleeve 220, making it difficult for the refrigeration oil to pass between the first connecting surface 321 and the sleeve 220. The second connecting surface 322 is designed as an eccentric structure. There is a gap 400 between the second connecting surface 322 and the sleeve 220. The refrigeration oil enters the first groove 230 through the gap 400, then flows through the first through hole 240, and finally flows to the bottom of the compressor to realize circulation, thereby avoiding a large amount of refrigeration oil from being discharged from the compressor after being atomized, thereby improving the energy efficiency of the refrigeration system and the reliability of the compressor.

[0055] In specific applications, the first connecting surface 321 corresponds to the exhaust side of the compressor cylinder, and the second connecting surface 322 corresponds to the intake side of the compressor cylinder to prevent the refrigeration oil from flowing through the exhaust side, that is, to prevent the refrigeration oil from combining with the gaseous refrigerant and atomizing to form a mixture and being discharged from the compressor, ensuring that the refrigeration oil passes through the intake side, while also playing a heat insulating role.

[0056] See also Figure 5 and 6 In some embodiments, the upper end of the first cover body 320 is higher than the upper end of the sleeve 220, so as to better shield the refrigeration oil flowing out between the rotating shaft and the sleeve 220, so that the refrigeration oil flowing out through the upper end of the sleeve 220 will not overflow to the outside of the first cover body 320, thereby reducing the amount of refrigeration oil atomization and thus reducing the oil discharge amount.

[0057] See also Figure 3 Furthermore, a second groove 250 is formed on the upper end surface of the sleeve 220 at a position relative to the second connecting surface 322 for leading out the refrigeration oil between the rotating shaft and the sleeve 220, so that the refrigeration oil converges into the second groove 250 and enters the gap 400 between the second connecting surface 322 and the sleeve 220 from the second groove 250, thereby having a better drainage effect on the refrigeration oil.

[0058] Specifically, a step structure is formed on the upper end surface of the sleeve 220, and there is a height difference. After the refrigeration oil flows out through the upper end of the rotating shaft, it converges to a part with a relatively low height, that is, the second groove 250 part. After passing through the second groove 250, the gap 400 between the second connecting surface 322 and the sleeve 220, the first groove 230 and the first through hole 240, it flows to the bottom of the compressor to achieve circulation.

[0059] Furthermore, a drainage slope 260 is formed between the lower end of the outer surface of the sleeve 220 and the first groove 230, so as to facilitate the refrigeration oil to be drained into the first groove 230 through the drainage slope 260, thereby achieving a better drainage effect.

[0060] After the refrigeration oil flows out from the upper end of the sleeve 220, it will flow downward along the outer surface of the sleeve 220 under the action of its own gravity. When it flows to the lower end of the outer surface of the sleeve 220, it will be drained into the first groove 230 under the action of the drainage slope 260, thereby preventing the refrigeration oil from overflowing circumferentially along the outer surface of the sleeve 220.

[0061] In some embodiments, the first groove 230 is an annular groove, and there are multiple first through holes 240. The multiple first through holes 240 are all connected to the annular groove to perform multi-porous drainage of the refrigeration oil. At the same time, the layout area of ​​the annular groove also plays a heat insulation role.

[0062] Specifically, the first groove 230 is distributed in a ring-shaped state, which conforms to the regional shape between the lower edge of the sleeve 220 and the outer edge of the base 210. It also has regularity, which is convenient for processing. It can also cooperate with the connection distribution of multiple first through holes 240, so that the refrigeration oil flowing through the first groove 230 flows from different first through holes 240 to the bottom of the compressor, achieving better thermal insulation effect.

[0063] For example, there are three first through holes 240, and the three first through holes 240 are circumferentially spaced along the edge of the base 210 and are all connected to the first groove 230. It should be noted that in this embodiment, there are no specific restrictions on the number, distribution position and size of the first through holes 240, and they can be adjusted according to actual needs. Similarly, the shape of the first groove 230 is not limited, and it can be trapezoidal, semicircular or elliptical, etc.

[0064] This embodiment provides a pump assembly with a drainage structure. By setting an oil shield 300, the refrigeration oil flows out from between the rotating shaft and the sleeve 220, and then flows back to the bottom of the compressor through the gap 400, the first groove 230 and the first through hole 240 that are connected in sequence, avoiding flowing to the refrigerant exhaust port, reducing the amount of refrigeration oil atomization, and thus reducing the oil discharge amount; and the refrigeration oil flows through the first groove 230 and is located on the upper end surface of the base 210, which plays a heat insulating role, avoids the transfer of high-temperature exhaust gas, reduces the suction specific volume, and thus improves the performance of the compressor.

[0065] Example 2:

[0066] The difference between this embodiment and embodiment 1 is that this embodiment further optimizes the structure of the pump assembly of the present invention. Figure 7-11 .

[0067] See also Figure 8and Figure 9 In this embodiment, a third groove 270 is formed downward on the upper end surface of the base 210, and a second through hole 280 for the passage of refrigerant is formed at the bottom of the third groove 270; a third through hole 330 is formed at the position of the baffle 310 corresponding to the third groove 270, so that the refrigerant can enter the silencer 500 through the third through hole 330 to perform a silencing effect.

[0068] Combined with the content of Example 1, it can be seen that the lower surface of the baffle 310 is connected to the upper end surface of the base 210 and covers the first groove 230 and the first through hole 240. There is a gap 400 between the second connecting surface 322 and the sleeve 220, and the gap 400 is connected to the first groove 230. The first groove 230 is connected to the first through hole 240. Since the first cover 320 is provided on the outer periphery of the sleeve 220, and the baffle 310 is provided to cover the first groove 230 and the first through hole 240, that is, through the joint action of the first cover body 320 and the baffle 310, the refrigeration oil flowing out through the upper end of the sleeve 220 can only be drained to the bottom of the compressor by the drainage structure formed by the gap 400, the first groove 230 and the first through hole 240, and here, a third through hole 330 is formed at a position corresponding to the third groove 270 on the baffle 310, which is used to cooperate with the second through hole 280 so that the refrigerant can be discharged smoothly without interfering with the drainage structure.

[0069] Furthermore, the first groove 230 and the third groove 270 are respectively located on opposite sides of the sleeve 220, so that the refrigeration oil flowing through the first groove 230 plays a heat insulating role, avoids the high temperature transfer of exhaust gas, reduces the suction specific volume, and thus improves the performance of the compressor.

[0070] The first groove 230 is used to drain the refrigeration oil, and the bottom of the third groove 270 is formed with a second through hole 280 for the refrigerant to pass through, that is, the third groove 270 is used to cooperate with the discharge of the refrigerant. In actual application, in order to prevent the refrigeration oil flowing through the first groove 230 and the refrigerant passing through the third groove 270 from interfering with each other, this embodiment arranges the first groove 230 and the third groove 270 on opposite sides of the sleeve 220 respectively, and the sleeve 220 can play a better separation role for the first groove 230 and the third groove 270.

[0071] More specifically, in combination with the conventional compressor structure, a second through hole 280 for the passage of refrigerant is formed at the bottom of the third groove 270, that is, the third groove 270 usually corresponds to the exhaust side of the compressor cylinder body. It can be understood that the side opposite to the exhaust side is the intake side of the compressor cylinder body, that is, the first groove 230 is located on the intake side of the compressor cylinder body. Since the exhaust side of the compressor cylinder body is the low-temperature side and the intake side is the high-temperature side, the refrigerant on the high-temperature side will be quickly transferred to the refrigerant on the low-temperature side, resulting in overheating of the intake air. In this embodiment, the first groove 230 is arranged on the intake side, that is, the high-temperature side, which can play a certain heat insulating role, avoid the high-temperature transfer of exhaust gas, reduce the intake specific volume, and thus improve the performance of the compressor.

[0072] See also Figure 7 、 Figure 10 and Figure 11 In some embodiments, the pump assembly further includes a silencer 500 and a cylinder body 600, the silencer 500 is connected to the upper surface of the baffle 310, and the cylinder body 600 is connected to the lower end surface of the base 210; a fourth through hole 610 is formed on the cylinder body 600 at a position corresponding to the first through hole 240, and the fourth through hole 610 is connected to the first through hole 240 to achieve the drainage of the refrigeration oil to the bottom of the compressor.

[0073] Furthermore, the silencer cover 500 includes a panel 510, and a second cover body 520 is formed upward in the middle of the panel 510; the lower surface of the panel 510 is sealed and connected to the upper surface of the baffle 310, and the second cover body 520 is arranged above the third through hole 330 to silence the refrigerant gas discharged through the third through hole 330.

[0074] The upper surface of the baffle 310 and the inner side of the second cover 520 form a silencer chamber, which has a silencing effect on the refrigerant gas discharged through the third through hole 330 .

[0075] Example 3:

[0076] This embodiment provides a compressor based on the above embodiment 1. Figure 12 .

[0077] A compressor 700 includes a housing (not shown) and a pump assembly 100 in any of the above embodiments. The pump assembly is installed in the housing. The pump assembly has a drainage structure formed by a gap 400, a first groove 230 and a first through hole 240, which is used to drain the refrigeration oil flowing out of the upper end of the sleeve 220 to the bottom of the compressor. The application of this pump assembly can reduce the oil discharge volume and the suction specific volume, effectively improving the energy efficiency and operational reliability of its refrigeration system.

[0078] In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," "connect," "fixed," etc. should be understood broadly. For example, they may refer to fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0079] In the description of the present invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer" and the like indicate positions or locations based on the positions shown in the accompanying drawings, or the positions or locations in which the inventive product is typically placed when in use. These terms are intended solely to facilitate the description of the present invention and to simplify the description, and are not intended to indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on the present invention. Furthermore, the terms "first," "second," and "third," etc., are used solely to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0080] Furthermore, terms such as "horizontal," "vertical," and "overhanging" do not necessarily imply that a component must be absolutely horizontal or overhanging, but rather that it can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but rather that it can be slightly tilted.

[0081] In the present invention, unless otherwise expressly specified or limited, a first feature being above or below a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Furthermore, a first feature being above, above, and above the second feature includes the first feature being directly above and obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being below, below, and below the second feature includes the first feature being directly below and obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0082] Although the present invention has been described with reference to the above specific embodiments, it will be apparent to those skilled in the art that many substitutions, modifications, and variations can be made based on the above. Therefore, all such substitutions, modifications, and variations are intended to be encompassed within the spirit and scope of the appended claims.

Claims

1. A pump assembly with a drainage structure, characterized in that: The pump assembly (100) comprises an upper support (200) and an oil shield (300); The upper support (200) includes a base (210), a shaft sleeve (220) for the shaft to pass through is formed upwardly in the middle of the base (210), and a first groove (230) and a first through hole (240) for the circulation of refrigeration oil are formed downwardly on the upper end surface of the base (210), and the first groove (230) is connected to the first through hole (240); The oil shield (300) comprises a baffle (310), a first shield body (320) for sleeved around the outer periphery of the shaft sleeve (220) is formed upwardly at the middle portion of the baffle (310), and a lower surface of the baffle (310) is connected to the upper end surface of the base (210) and covers the first groove (230) and the first through hole (240); The first cover (320) is formed by enclosing a first connecting surface (321) and a second connecting surface (322); the first connecting surface (321) is in close contact with the shaft sleeve (220); a gap (400) exists between the second connecting surface (322) and the shaft sleeve (220); the gap (400) is connected to the first groove (230); The first connecting surface (321) corresponds to the exhaust side, and the second connecting surface (322) corresponds to the intake side; The pump assembly further comprises a silencer cover (500) and a cylinder body (600), wherein the silencer cover (500) is connected to the upper surface of the baffle (310); The muffler cover (500) comprises a panel (510), and a second cover body (520) is formed upwardly in the middle of the panel (510); The lower surface of the panel (510) is sealed to the upper surface of the baffle (310).

2. The pump assembly with drainage structure according to claim 1, characterized in that: The upper end of the first cover (320) is higher than the upper end of the shaft sleeve (220).

3. The pump assembly with drainage structure according to claim 1, characterized in that: A second groove (250) for drawing out refrigeration oil between the rotating shaft and the shaft sleeve (220) is formed on the upper end surface of the shaft sleeve (220) at a position relative to the second connecting surface (322).

4. The pump assembly with drainage structure according to claim 1, characterized in that: A drainage slope (260) is formed between the lower end of the outer surface of the shaft sleeve (220) and the first groove (230).

5. The pump assembly with drainage structure according to claim 1, characterized in that: The first groove (230) is an annular groove, and there are a plurality of first through holes (240), all of which are in communication with the annular groove.

6. The pump assembly with drainage structure according to claim 1, characterized in that: A third groove (270) is formed downwardly on the upper end surface of the base (210), and a second through hole (280) for the passage of refrigerant is formed at the bottom of the third groove (270); A third through hole (330) is formed on the baffle (310) at a position corresponding to the third groove (270).

7. The pump assembly with drainage structure according to claim 6, characterized in that: The first groove (230) and the third groove (270) are respectively located on opposite sides of the shaft sleeve (220).

8. The pump assembly with drainage structure according to claim 6 or 7, characterized in that: The cylinder (600) is connected to the lower end surface of the base (210); A fourth through hole (610) is formed on the cylinder body (600) at a position corresponding to the first through hole (240), and the fourth through hole (610) is connected to the first through hole (240).

9. The pump assembly with drainage structure according to claim 8, characterized in that: The second cover body (520) is arranged above the third through hole (330).

10. A compressor, characterized in that: A pump assembly (100) comprising a housing and any one of claims 1 to 9; The pump assembly (100) is installed in the housing.

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