CN205047437U - Compressor - Google Patents

Abstract

The purpose of the utility model is to provide a compressor, which mainly solves the technical problem that the driving shaft of the existing compressor needs to be provided with a proprietary thrust structure, which leads to complex structure and inconvenient assembly. The compressor includes a compression mechanism, a displacement rotor pump for supplying oil to a lubricating oil circulation circuit of the compressor, and a drive shaft for driving the compression mechanism and the displacement rotor pump. The displacement rotor pump has a shaft for receiving the rotor The opening of the accommodating cavity is provided with a sealing cover, and the end face of the drive shaft away from the compression mechanism is directly supported on the sealing cover and pressed against the sealing cover to seal the accommodating cavity. The thrusting effect on the drive shaft is achieved through the sealing cover plate, which does not require a separate thrust structure, which simplifies the structure of the compressor. The sealing cover plate is pressed against the accommodating cavity under the action of the driving shaft, thereby realizing the sealing of the accommodating cavity, and the driving shaft The gravity of the shafting is relatively small, and the sealing cover will not be deformed, so as to ensure the axial clearance between the sealing cover and the rotor.

Description

a compressor

technical field

The utility model relates to the field of compressors, in particular to a compressor lubricated by a volumetric rotor pump.

Background technique

In the existing scroll compressor, the upper end of the drive shaft passes through the bearing through hole of the upper bracket to support the rotating part of the moving plate, the lower end of the drive shaft passes through the bearing through hole of the lower bracket, the upper and lower brackets are welded on the shell, and the upper and lower brackets pass through Sliding or rolling bearings are arranged in the hole to constrain the radial displacement of the drive shaft and support the drive shaft for rotational movement. The drive shaft is equipped with a motor rotor and main and auxiliary balance weights, which constitute the shaft assembly of the compressor. In order to overcome the gravity of the shaft assembly, it is necessary to design an axial thrust limit structure to support the shaft and prevent the shaft from falling , the existing technical means are all to design the thrust limit support structure on the upper bracket or the lower bracket of the compressor. The thrust structure fixed on the upper or lower bracket through bolt connection, on the one hand, additional design of the thrust structure is required to increase the manufacturing cost of the compressor; The integrated thrust structure of the upper (lower) bracket requires additional processing of this type of thrust support surface structure on the bracket, which increases the processing cost of the upper and lower brackets. Therefore, the existing drive shaft axial thrust structures all have the problems of inconvenient assembly and high production cost.

On the other hand, in the existing variable frequency scroll compressors, in order to ensure that the friction pairs inside the compressor have a good lubricating effect under various working conditions, more and more positive displacement gear oil pumps are used to supply oil to the compressor. Generally, a positive displacement gear oil pump is composed of internal and external gears, a base, and an oil pump sealing cover. In order to ensure the oil pumping efficiency of the gear oil pump, the gear oil pump needs to have good axial sealing. Therefore, the oil pump sealing cover needs to be cold pressed or riveted. The advanced technology is fastened on the base of the oil pump, so as to realize the axial seal of the gear oil pump. The cold pressing and riveting process of oil pump sealing cover plate is the core technology of oil pump manufacturers, which undoubtedly increases the purchase cost of gear oil pumps and the production cost of compressors.

Utility model content

In view of this, the utility model provides a compressor with a simple structure, which can realize the thrust effect on the drive shaft and the axial sealing effect of the displacement rotor pump.

For this purpose, the utility model adopts the following technical solutions:

A compressor comprising a compression mechanism, a displacement rotor pump for supplying oil to a lubricating oil circulation circuit of the compressor, and a drive shaft for driving the compression mechanism and the displacement rotor pump, the displacement The type rotor pump has an accommodating cavity for accommodating the rotor, the opening of the accommodating cavity is provided with a sealing cover plate, and the end face of the end of the drive shaft away from the compression mechanism is directly supported on the sealing cover plate and is in contact with the sealing cover plate. The sealing cover plate is compressed to seal the accommodating cavity.

Preferably, a wear-resistant layer is provided on the end surface of the sealing cover plate abutting against the end surface of the drive shaft.

Preferably, the wear-resistant layer is formed by quenching, nitriding or carburizing on the end surface of the sealing cover plate.

Preferably, the end of the drive shaft away from the compression mechanism is rotatably arranged in the support seat through the auxiliary bearing, and a gap space is formed between the support seat, the drive shaft and the auxiliary bearing, and the sealing cover plate One side seals the opening of the accommodating cavity, and the other side is opposite to the end surface of the drive shaft and the gap space;

A groove structure is provided on the surface of the sealing cover plate opposite to the gap space at least at a position corresponding to the gap space.

Preferably, the positive displacement rotor pump further includes a base fixed on the support seat and an oil pump cylinder fixedly arranged in the base, the base and the oil pump cylinder form the accommodating chamber with one end open. cavity, the sealing cover seals the opening of the accommodating cavity;

There is clearance fit between the outer periphery of the sealing cover plate and the base.

Preferably, the groove structure extends to the outer edge of the sealing cover;

A connection through hole is provided on the base, one end of the connection through hole communicates with the groove structure, and the other end communicates with the oil pool at the bottom of the compressor.

Preferably, a position-limiting structure that restricts the rotation of the sealing cover is provided between the base and the sealing cover.

Preferably, the drive shaft is provided with an eccentric shaft that is eccentric to the axis of the drive shaft, and the eccentric shaft is connected to the rotor for driving the rotor to orbit around the drive shaft while The eccentric shaft rotates around the center;

An installation through hole is opened in the middle of the sealing cover plate, and the eccentric shaft and the rotor pass through the installation through hole and are rotatably arranged on the sealing cover plate.

Preferably, the groove structure includes a plurality of radial grooves arranged along the circumferential direction of the sealing cover plate, one end of the radial groove extends to the installation through hole, and the other end extends to the sealing outer edge of the cover.

Preferably, the groove structure further includes at least one annular groove, and the annular groove communicates with the plurality of radial grooves.

Preferably, the end surface of the drive shaft presses the sealing cover plate and the base, and there is a gap between the sealing cover plate and the opposite end surfaces of the cylinder block of the oil pump and the rotor.

Preferably, the drive shaft is provided with a main oil hole extending along its axial direction, and an auxiliary bearing oil hole is also provided, one end of the auxiliary bearing oil hole is connected to the main oil hole, and the other end is connected to the auxiliary bearing place.

Preferably, the positive displacement rotor pump is a gear pump.

The beneficial effects of the utility model are:

The compressor provided by the utility model directly supports the end face of the driving shaft on the sealing cover plate. Firstly, the sealing cover plate realizes the thrust effect on the driving shaft to prevent the drive shaft from moving. Compressor structure, in addition, the sealing cover plate is pressed against the housing cavity under the action of the drive shaft, so as to realize the sealing of the housing cavity. The plate is deformed to ensure the axial clearance between the sealing cover plate and the rotor.

Description of drawings

Through the following description of the embodiments of the utility model with reference to the accompanying drawings, the above-mentioned and other purposes, features and advantages of the utility model will be more clear, in the accompanying drawings:

Fig. 1 is a sectional view of a compressor provided by a specific embodiment of the present invention;

Fig. 2 is a sectional view of the gear pump of the compressor provided by the specific embodiment of the present invention;

Fig. 3 is a partial enlarged view of place C in Fig. 2;

Fig. 4 is a top view of the compressor gear pump provided by the specific embodiment of the present invention;

Fig. 5 is an exploded view of the compressor gear pump provided by the specific embodiment of the present invention;

Fig. 6 is a top view of a sealing cover plate provided by a specific embodiment of the present invention;

Fig. 7 is a sectional view along A-A in Fig. 6;

Fig. 8 is a top view of another form of sealing cover provided by the specific embodiment of the present invention;

Fig. 9 is a cross-sectional view along B-B in Fig. 8 .

In the figure, 1. shell; 2. upper cover; 3. lower cover; 4. drive shaft; 41. main oil hole; 42. auxiliary bearing oil hole; 5. upper support seat; 6. lower support seat; 7. Moving scroll; 8. Static scroll; 9. First eccentric shaft; 10. Second eccentric shaft; 11. Sliding bearing; 12. Oldham slip ring; 13. Main balance weight; 14. Secondary balance weight; 15. Motor ; 151, motor rotor; 16, housing cavity; 17, sealing cover; 171, wear-resistant layer; 172, groove structure; 1721, radial groove; 1722; annular groove; 173, protrusion; 174, installation Through hole; 18, gear rotor; 19, auxiliary bearing; 20, oil pool; 21, clearance space; 22, base; 221, groove; 222, oil suction through hole; 223, oil discharge groove; Oil pump filter screen; 24, bolts; 25, oil pump cylinder; 26, main bearing.

detailed description

The utility model is described below based on examples, but the utility model is not limited to these examples. In the following detailed description of the present utility model, some specific details are described in detail. Those skilled in the art can fully understand the present invention without the description of these detailed parts. In order to avoid obscuring the essence of the present invention, well-known methods, procedures, procedures, and components are not described in detail.

The following describes the embodiment of the compressor of the present invention with reference to FIGS. 1 to 8 .

As shown in FIG. 1 , the compressor includes a casing 1 with upper and lower ends open, and an upper cover 2 and a lower cover 3 closing the upper and lower ends of the casing 1 . The "up" and "down" mentioned in this article refer to the positional relationship of the compressor during normal operation. The casing 1 is provided with a compression mechanism, a positive displacement rotor pump for supplying oil to the lubricating oil circulation circuit of the compressor, and a drive shaft 4 for driving the compression mechanism and the positive displacement rotary pump. The lubricating oil in the oil pool 20 at the bottom of the compressor is delivered to each friction pair of the compressor by a positive displacement rotor pump for lubrication. In this embodiment, the positive displacement rotor pump is a gear pump, of course, other pumps that change the volume of the rotor accommodation cavity through the rotation of the rotor to realize oil suction and oil discharge are also available.

The compression mechanism is similar to an existing compressor. As shown in FIG. 1 , an upper support seat 5 and a lower support seat 6 are respectively provided on the upper part and the lower part of the housing 1 . The middle part of the housing 1 is provided with a motor 15, the motor rotor 151 is pierced with a drive shaft 4, the upper part of the drive shaft 4 is rotatably set on the upper support base 5 via the main bearing 26, and the lower part is rotatably set on the lower support base 6 via the auxiliary bearing 19 superior. The movable scroll 7 and the fixed scroll 8 are installed opposite to each other on the upper support seat 5 with a phase angle difference of 180 degrees, thereby meshing to form a plurality of compression chambers that are isolated from each other and whose volume changes continuously. The lower end and the upper end of the drive shaft 4 are respectively provided with The first eccentric shaft 9 and the second eccentric shaft 10 of the drive shaft 4 are eccentric, and the second eccentric shaft 10 is fixedly connected with the movable scroll 7 through the sliding bearing 11, and an anti-moving mechanism is arranged between the movable scroll 7 and the upper support seat 5 Oldham slip ring 12 for volute 7 rotation. The drive shaft 4 is also provided with a main balance weight 13 and an auxiliary balance weight 14 , which together with the motor rotor 151 form the shaft system of the compressor.

The working process of the compression mechanism is that the motor 15 drives the motor rotor 151 to drive the drive shaft 4 to rotate. Under the drive of the drive shaft 4 and the restriction of the Oldham slip ring 12, the movable scroll 7 surrounds the center of the fixed scroll 8 with the radius of the base circle. Plane circular motion without rotation. The refrigerant enters the scroll compressor through the suction pipe of the casing 1, and the pump body composed of the movable scroll 7 and the fixed scroll 8 is freely sucked and compressed in the casing 1, and the high-pressure gas compressed by the pump body is released from the The exhaust pipe of the upper cover 2 discharges.

At the same time, driven by the drive shaft 4, the gear pump transports the lubricating oil in the oil pool 20 at the bottom of the compressor to each friction pair of the compressor for lubrication.

The gear pump has an accommodating cavity 16 for accommodating the gear rotor 18. A sealing cover 17 is provided at the opening of the accommodating cavity 16. The lower end surface of the driving shaft 4 is directly supported on the sealing cover 17. First, through the sealing cover 17 The thrust effect is realized on the drive shaft 4, without a separate thrust structure, which greatly simplifies the structure of the compressor. In addition, the drive shaft 4 is pressed against the sealing cover plate 17 to seal the opening of the accommodation chamber 16. Compared with the cold pressure , the gravity of the drive shaft 4 axis system is small, and will not deform the sealing cover plate 17, so as to ensure the axial clearance between the sealing cover plate 17 and the gear rotor.

Preferably, a wear-resistant layer 171 is provided on the end surface of the sealing cover plate 17 abutting against the end surface of the drive shaft 4 , and the lower end surface of the drive shaft 4 abuts against the wear-resistant layer 171 . The wear-resistant layer 171 can be obtained by performing surface treatment processes such as quenching, nitriding or carburizing on the end surface of the sealing cover plate 17, and the wear-resistant layer 171 with self-lubricating properties can also be obtained by surface coating.

Specifically, the gear pump is installed on the lower end surface of the lower support base 6 . As shown in FIGS. 2 to 5 , the lower end of the drive shaft 4 is rotatably arranged in the lower support seat 6 via the auxiliary bearing 19 . The drive shaft 4 is provided with a main oil hole 41 extending in its axial direction, and an auxiliary bearing oil hole 42 , one end of the auxiliary bearing oil hole 42 is connected to the main oil hole 41 , and the other end leads to the auxiliary bearing 19 . The drive shaft 4 rotates under the drive of the motor rotor 151, drives the gear pump to pump the lubricating oil in the oil sump 20 at the bottom of the compressor into the main oil hole 41, and then enters the auxiliary bearing 19 through the auxiliary bearing oil hole 42 for lubrication. A gap space 21 is formed between the drive shaft 4 , the lower support base 6 and the auxiliary bearing 19 . The lower end surface of the sealing cover plate 17 seals the opening of the accommodating chamber 16 , and the upper end surface is opposite to the end surface of the driving shaft 4 and the gap space 21 . A groove structure 172 is provided at least at a position corresponding to the gap space 21 on the surface of the sealing cover plate 17 opposite to the gap space 21 . The lubricating oil in the gap space 21 can form a uniform lubricating oil layer on the end surface of the wear-resistant layer 171 through the groove structure 172 , reducing the wear of the wear-resistant layer 171 .

The gear pump includes a base 22 arranged at the bottom of the lower support base 6 , and the base 22 is fixed on the lower support base 6 . Preferably, the base 22 is covered with an oil pump filter 23 , and the oil pump filter 23 and the base 22 are fixed on the lower support base 6 by bolts 24 . The base 22 is provided with a hollow oil pump cylinder 25 , and the base 22 and the oil pump cylinder 25 enclose an accommodating cavity 16 with an upper end opening, and the opening of the accommodating cavity 16 is closed by a sealing cover 17 . The middle part of the sealing cover plate 17 is provided with an installation through hole 174, the first eccentric shaft 9 and the gear rotor 18 are rotatably arranged on the sealing cover plate 17 through the installation through hole 174, and the gear rotor 18 extends into the sealing cover plate 17 to accommodate cavity 16. The inner peripheral wall of the housing chamber 16 is provided with an internal gear, and the first eccentric shaft 9 drives the gear rotor 18 to orbit around the driving shaft 4. At the same time, the gear rotor 18 is centered on the first eccentric shaft 9 under the meshing action with the internal gear. Rotate to complete the oil suction and oil discharge process.

The outer circumference of the sealing cover plate 17 and the base 22 are in clearance fit and the sealing cover plate 17 is pressed against the base 22 by the end face of the drive shaft 4. There is a gap between the sealing cover plate 17 and the opposite end faces of the oil pump cylinder 25 and the gear rotor 18 , to ensure that the gear rotor 18 rotates smoothly. For the existing assembly process, if the gear pump sealing cover plate 17 is assembled on the base 22 by cold pressing, the cold pressing pressure is taken as the core parameter. If the pressure is not enough, the axial gap between the sealing cover plate 17 and the gear rotor 18 becomes smaller. If the pressure is too large, the sealing cover 17 will exert too much pressure on the base 22, causing the base 22 to deform, and the sealing cover 17 may come into contact with the gear rotor 18, causing the gear pump to jam. In addition, in the cold pressing process of the sealing cover 17, it is necessary to ensure a good parallelism between the sealing cover 17 and the mounting surface of the base 22. If the sealing cover 17 is inclined, the sealing cover will The lower end of the plate 17 may be in contact with the upper end surface of the gear rotor 18, which may also cause the gear pump to be stuck. For the riveting process, it is also necessary to control the riveting pressure, and the gear pump with the characteristics of the utility model, on the one hand, by moving the thrust structure of the compressor shaft system to the gear pump, the processing of components for the additional design of the thrust structure is reduced and assembly cost; at the same time, the downward thrust of the shafting is converted into the axial sealing force between the sealing cover 17 and the base 22, reducing the additional assembly process of the sealing cover 17. As shown in Figure 4, the wear-resistant layer 171 of the sealing cover 17 bears the downward thrust from the gravity of the shafting, and the sealing cover 17 is tightly attached to the base 22 under the action of the downward thrust of the shafting, The axial limit of the shaft system is realized by the base 22, and at the same time, the designed axial gap (oil film seal thickness) is maintained between the lower end surface of the sealing cover plate 17 and the upper end surface of the gear rotor 18 to ensure a good axial sealing effect. Compared with the cold pressing pressure, the gravity of the drive shaft shafting is smaller, which will not deform the base 22 and will not affect the matching accuracy of the installation positions of the gear rotor 18 and the oil pump cylinder 26 .

Further, in order to prevent the sealing cover 17 from rotating, a limiting structure is provided between the base 22 and the sealing cover 17 to limit the rotation of the sealing cover 17 . For example, a protrusion 173 protrudes radially outward on the outer periphery of the sealing cover 17 , and a groove 221 is provided at a corresponding position of the base 22 , and the protrusion 173 cooperates with the groove 221 to realize the position limitation of the sealing cover 17 .

The base 22 is provided with an oil suction through hole 222 extending in the axial direction. The oil suction through hole 222 forms an oil suction passage of the gear pump, through which the lubricating oil in the oil pool 20 is sucked into the oil suction chamber of the gear pump. An oil discharge groove 223 is arranged on the upper surface of the base 22, and the oil discharge groove 223 can communicate with the accommodating chamber 16 and the main oil hole 41, so that when the gear pump drains oil, lubricating oil enters the main oil hole 41 through the oil discharge groove 223.

The base 22 is provided with connecting through holes 224, in this embodiment, there are three evenly distributed along the circumferential direction. One end of the connecting through holes 224 communicates with the groove structure 172, and the other end communicates with the oil pool 20 at the bottom of the compressor. The lubricating oil is discharged in time through the connection through hole 224, and a cyclic oil supply and oil discharge cycle is formed at the auxiliary bearing 19 and the sealing cover plate 17 to prevent the lubricating oil from being accumulated in the gap between the lower support seat 6 and the auxiliary bearing 19. The lubrication effect at the upper end surface of the auxiliary bearing 19 and the sealing cover plate 17.

As shown in Figures 6 and 7, the groove structure 172 can be a plurality of radial grooves 1721 arranged in the circumferential direction on the upper end surface of the sealing cover plate 17, the radial grooves 1721 are fan-shaped, and one end extends to the installation through hole 224 , and the other end extends to the outer edge of the sealing cover 17 .

Further, the groove structure 172 can also be shown in FIG. 8 and FIG. 9 , at least one annular groove 1722 is provided on the basis of the original radial groove, and the annular groove 1722 is connected to the radial groove. The radial groove 1721 is not limited to the elongated shape shown in the figure, and may also be in other shapes.

Additionally, those of ordinary skill in the art will appreciate that the drawings provided herein are for illustrative purposes and are not necessarily drawn to scale.

At the same time, it should be understood that example embodiments are provided so that this disclosure will be thorough, and will fully convey the scope to those skilled in the art. Numerous specific details are given, such as examples of specific components, devices and methods, to provide a thorough understanding of the present disclosure. It will be apparent to those skilled in the art that specific details need not be employed, that example embodiments may be embodied in many different forms and that neither should be construed to limit the scope of the disclosure. In some example embodiments, well-known device structures and well-known technologies are not described in detail.

When an element or layer is referred to as being "on," "bonded to," "connected to," or "coupled to" another element or layer, it can be directly on the other element or layer. or layer, be directly bonded, connected or coupled to another element or layer, or intervening elements or layers may be present. In contrast, when an element is referred to as being "directly on," "directly engaged to," "directly connected to," or "directly coupled to" another element or layer When , there may be no intervening elements or layers. Other words used to describe the relationship between elements should be interpreted in a like fashion (eg, "between" versus "directly between," "adjacent" versus "directly adjacent," etc.). As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

Although the terms first, second, third, etc. may be used herein to describe various elements, components, regions, layers and/or sections, these elements, components, regions, layers and/or sections should not be referred to by these Terminology restrictions. These terms may be only used to distinguish one element, component, region, layer or section from another element, region, layer or section. Terms such as "first," "second," and other numerical terms when used herein do not imply a sequence or order unless clearly indicated by the context. Thus, a first element, component, region, layer or section discussed below could be termed a second element, component, region, layer or section without departing from the teachings of example embodiments. In addition, in the description of the present utility model, unless otherwise specified, "plurality" means two or more.

The above descriptions are only preferred embodiments of the present utility model, and are not intended to limit the present utility model. For those skilled in the art, the present utility model may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model shall be included in the protection scope of the present utility model.

Claims (13)

1. A compressor comprising a compression mechanism, a displacement rotor pump for supplying oil to a lubricating oil circulation circuit of the compressor, and a drive shaft (4) for driving the compression mechanism and the displacement rotor pump ), the positive displacement rotor pump has a housing chamber (16) for housing the rotor, the opening of the housing chamber (16) is provided with a sealing cover (17), characterized in that: the drive shaft (4 ) is directly supported on the sealing cover plate (17) and pressed against the sealing cover plate (17) to seal the accommodating cavity (16). 2. The compressor according to claim 1, characterized in that a wear-resistant layer (171) is provided on the end surface of the sealing cover plate (17) abutting against the end surface of the drive shaft (4). 3. The compressor according to claim 2, characterized in that the wear-resistant layer (171) is formed by quenching, nitriding or carburizing on the end surface of the sealing cover plate (17). 4. The compressor according to any one of claims 1 to 3, characterized in that: the end of the drive shaft (4) away from the compression mechanism is rotatably set in the support seat (6) via a secondary bearing (19) , a gap space (21) is formed between the support seat (6), the drive shaft (4) and the auxiliary bearing (19), and one side of the sealing cover (17) seals the accommodating chamber (16 ) opening seal, and the other side is set opposite to the end face of the drive shaft (4) and the gap space (21); A groove structure (172) is provided at least at a position corresponding to the gap space (21) on the surface of the sealing cover plate (17) opposite to the gap space (21). 5. The compressor according to claim 4, characterized in that: the positive displacement rotor pump further comprises a base (22) fixed on the support seat (6) and fixedly arranged in the base (22) The oil pump cylinder (25), the base (22) and the oil pump cylinder (25) enclose the accommodating cavity (16) with one end open, and the sealing cover (17) seals the accommodating cavity ( 16) said opening sealing; There is clearance fit between the outer periphery of the sealing cover (17) and the base (22). 6. The compressor according to claim 5, characterized in that: the groove structure (172) extends to the outer edge of the sealing cover plate (17); The base (22) is provided with a connection through hole (224), one end of the connection through hole (224) communicates with the groove structure (172), and the other end communicates with the oil pool (20) at the bottom of the compressor connected. 7. The compressor according to claim 5, characterized in that a position limiting structure is provided between the base (22) and the sealing cover (17) to limit the rotation of the sealing cover (17). 8. The compressor according to claim 6, characterized in that: the drive shaft (4) is provided with an eccentric shaft (9) eccentric to the axis of the drive shaft (4), and the eccentric shaft (9) ) is connected with the rotor (18), and is used to drive the rotor (18) to orbit around the drive shaft (4) while rotating around the eccentric shaft (9); The middle part of the sealing cover plate (17) is provided with an installation through hole (174), and the eccentric shaft (9) and the rotor (18) are rotatably arranged on the said installation through hole (174). On the sealing cover (17). 9. The compressor according to claim 8, characterized in that: the groove structure (172) comprises a plurality of radial grooves (1721) arranged along the circumferential direction of the sealing cover plate (17), the One end of the radial groove (1721) extends to the installation through hole (174), and the other end extends to the outer edge of the sealing cover (17). 10. The compressor according to claim 9, characterized in that: the groove structure further comprises at least one annular groove (1722), and the annular groove (1722) communicates with the plurality of radial grooves ( 1721). 11. The compressor according to claim 5, characterized in that there is a gap between the sealing cover plate (17) and the opposite end faces of the oil pump cylinder (25) and the rotor (18). 12. The compressor according to claim 4, characterized in that: the drive shaft (4) is provided with a main oil hole (41) extending along its axial direction, and a secondary bearing oil hole (42), One end of the auxiliary bearing oil hole (42) is connected to the main oil hole (41), and the other end leads to the auxiliary bearing (19). 13. The compressor according to any one of claims 1 to 3, characterized in that the positive displacement rotor pump is a gear pump.