Pump assembly with drainage structure and compressor

Abstract

The invention relates to the technical field of compressors, and discloses a pump assembly with a drainage structure and a compressor, a first groove and a first through hole which are used for circulation of refrigerating machine oil are formed downwards in the upper end face of a base, the first groove is communicated with the first through hole, and the pump assembly comprises an upper support and an oil blocking cover. The middle of the baffle is upwards provided with a first cover body used for being arranged on the periphery of the shaft sleeve in a sleeving mode, the lower surface of the baffle is connected with the upper end face of the base and covers the first groove and the first through hole, the first cover body is defined by a first connecting face and a second connecting face, the first connecting face is tightly attached to the shaft sleeve, and the second connecting face is tightly attached to the shaft sleeve. A gap is formed between the second connecting surface and the shaft sleeve and is communicated with the first groove; the method has the following technical effects that a large amount of atomized refrigerating machine oil is prevented from being discharged out of the compressor, and the energy efficiency of a refrigerating system and the reliability of the compressor are improved.

Description

Technical Field

[0001] The 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 housing assembly, refrigeration oil, a filter bottle and other components. Among them, the pump assembly is composed of an upper support, a cylinder body, a shaft, spiral vanes, a ring and a silencer cover. 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 and the shaft, passes through the outer periphery of the shaft sleeve of the upper support, flows to the refrigerant exhaust port, combines with the gaseous refrigerant discharged from the exhaust port, and 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, which seriously affects its heat exchange efficiency and reduces the energy efficiency of the entire machine. At the same time, insufficient refrigeration oil causes the pump to be unable to be lubricated. 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 achieves the purpose of 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.

[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 comprises a base, a sleeve for the rotating shaft to pass through is formed upwardly in the middle of the base, a first groove and a first through hole for the circulation of refrigeration oil are formed downwardly on the upper end surface of the base, and the first groove is connected to the first through hole;

[0008] The oil shield comprises a shield plate, a first shield body for sleeved on the outer periphery of the shaft sleeve is formed upwardly in the middle of the shield plate, the lower surface of the shield plate 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 from 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, thereby reducing the atomization amount of the refrigeration oil and thus reducing the oil discharge amount.

[0011] In some implementations, a second groove for drawing out the refrigeration oil between the rotating shaft and the sleeve is formed on the upper end surface of the sleeve relative to the second connecting surface, 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 playing a better drainage role for 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 as to facilitate the refrigeration oil to 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 the passage of 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 silencer effect.

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

[0017] In some implementations, the pump assembly further includes a muffler cover and a cylinder body, wherein the muffler 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 realize the drainage of 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 the middle portion of the panel;

[0020] The lower surface of the panel is sealed and connected to the upper surface of the baffle, and the second cover body 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 in any one of the above items, wherein the pump assembly is installed in the housing, and the applied pump assembly 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. An oil shield is provided to allow the refrigeration oil to flow out from between the rotating shaft and the sleeve, and then flow 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 atomization amount of the refrigeration oil, 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 which, 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 is a schematic structural diagram of a pump assembly according to Embodiment 1 of the present invention;

[0026] Figure 2 is an exploded view of a pump assembly according to Embodiment 1 of the present invention;

[0027] Figure 3 It is a schematic structural diagram of an upper support according to Embodiment 1 of the present invention;

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

[0029] Figure 5 is a top view of a 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 is a schematic structural diagram of a pump assembly according to Embodiment 2 of the present invention;

[0032] Figure 8 It is a schematic structural diagram of an upper support according to Embodiment 2 of the present invention;

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

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

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

[0036] Fig.12 is a 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 connection surface; 322, second connection surface; 330, third through hole;

[0040] 400, gap;

[0041] 500, soundproof cover; 510, panel; 520, second cover body;

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

[0043] 700. Compressor. DETAILED DESCRIPTION

[0044] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. The described embodiments are only part of the embodiments of the present invention, not all of them.

[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 claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0046] Embodiment 1:

[0047] See also Figure 1-Figure 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, a sleeve 220 for the 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 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 plate 310 , a first cover body 320 for being sleeved on the outer periphery of the shaft sleeve 220 is formed upwardly in the middle of the baffle plate 310 , and the lower surface of the baffle plate 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 known 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 connection surface 321 and the second connection surface 322 are both curved surfaces, and two opposite sides of the first connection surface 321 are respectively connected to two opposite sides of the second connection surface 322 to enclose and form a 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 being concentric with the center of the sleeve 220, 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 being non-concentric with the center of the sleeve 220.

[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, so that 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, and 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 achieve 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 body, and the second connecting surface 322 corresponds to the intake side of the compressor cylinder body to prevent the refrigeration oil from flowing through the exhaust side, that is, to prevent the refrigeration oil from atomizing and forming a mixture after combining with the gaseous refrigerant 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 from 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 for leading out the refrigeration oil between the rotating shaft and the sleeve 220 is formed on the upper end surface of the sleeve 220 at a position relative to the second connecting surface 322, so that the refrigeration oil converges into the second groove 250 and enters into 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 relatively low height portion, namely, the second groove 250 portion, and then flows to the bottom of the compressor 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 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 due to 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, so as to prevent 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 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, thereby achieving better heat insulation.

[0063] For example, there are three first through holes 240, which are circumferentially spaced apart 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, which can be adjusted according to actual needs. Similarly, the shape of the first groove 230 is not limited, and can be trapezoidal, semicircular or elliptical, etc.

[0064] The present embodiment provides a pump assembly with a drainage structure, which is provided with an oil shield 300, so that after the refrigeration oil flows out between the rotating shaft and the sleeve 220, it flows back to the bottom of the compressor through the gap 400, the first groove 230 and the first through hole 240 which are connected in sequence, avoiding flowing to the refrigerant exhaust port, reducing the atomization amount of the refrigeration oil, 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 high-temperature exhaust gas transmission, reduces the suction specific volume, and thus improves the compressor performance.

[0065] Embodiment 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, see Figure 7-Figure 11 .

[0067] See also Figure 8and Fig. 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] In combination with the content of Example 1, it can be known 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, wherein there is a gap 400 between the second connecting surface 322 and the sleeve 220, the gap 400 is connected to the first groove 230, and the first groove 230 is connected to the first through hole 240. Since the first cover 320 is set on the outer periphery of the sleeve 220, and the baffle 310 is set 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 on the baffle 310 at a position corresponding to the third groove 270, which is used to cooperate with the second through hole 280 to enable the refrigerant to 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 exhaust gas transmission, reduces the suction specific volume, and thus improves the compressor performance.

[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 applications, 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, the first groove 230 and the third groove 270 are respectively arranged on opposite sides of the sleeve 220 in this embodiment, 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, 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 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 transfer of high exhaust temperature, reduce the intake specific volume, and thus improve the compressor performance.

[0072] See also Figure 7 , Fig.10 and Fig.11 In some embodiments, the pump assembly further includes a silencer cover 500 and a cylinder body 600, the silencer cover 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 realize 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 upwardly 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 body 520 form a silencer chamber, which has a silencer effect on the refrigerant gas discharged through the third through hole 330 .

[0075] Embodiment 3:

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

[0077] A compressor 700 includes a shell (not shown in the figure) and a pump assembly 100 in any of the above embodiments, wherein the pump assembly is installed in the shell. The pump assembly has a drainage structure formed by a gap 400, a first groove 230 and a first through hole 240, and 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 the pump assembly can reduce the oil discharge amount and the suction specific volume, thereby effectively improving the energy efficiency and operational reliability of the refrigeration system.

[0078] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0079] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, or the positions or positional relationships in which the product of the invention is usually placed when in use. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0080] In addition, the terms "horizontal", "vertical", "overhanging" and the like do not mean that the components are required to be absolutely horizontal or overhanging, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0081] In the present invention, unless otherwise clearly specified and 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 not being in direct contact but being in contact through another feature between them. Moreover, a first feature being above, above, and above a 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 a 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 is described in conjunction with the above specific embodiments, it is obvious that those skilled in the art can make many substitutions, modifications and changes according to the above content. Therefore, all such substitutions, improvements and changes are included in 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) comprises a base (210), a shaft 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), and the first groove (230) is connected to the first through hole (240); The oil shield (300) comprises a shield (310), a first shield body (320) for sleeved on the outer periphery of the shaft sleeve (220) is formed upwardly in the middle of the shield (310), and the lower surface of the shield (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 body (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); and the gap (400) is connected to the first groove (230).

2. The pump assembly with drainage structure according to claim 1, characterized in that: The upper end of the first cover body (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 guiding 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 opposite 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 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), and the plurality of first through holes (240) are all connected to 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 at a position of the baffle (310) 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 two opposite sides of the shaft sleeve (220).

8. The pump assembly with drainage structure according to any one of claims 1 to 7, characterized in that: 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), 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).

9. The pump assembly with drainage structure according to claim 8, characterized in that: 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), and the second cover body (520) is disposed 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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