CN108194360B

CN108194360B - Compressor and air conditioning unit

Info

Publication number: CN108194360B
Application number: CN201810179517.XA
Authority: CN
Inventors: 曹聪; 张天翼; 毕雨时; 李日华; 孟强军; 黄孜远; 张贺龙; 许云功; 张宝鸽; 刘志华; 侯芙蓉
Original assignee: Gree Electric Appliances Inc of Zhuhai
Current assignee: Gree Electric Appliances Inc of Zhuhai
Priority date: 2018-03-05
Filing date: 2018-03-05
Publication date: 2023-08-25
Anticipated expiration: 2038-03-05
Also published as: CN108194360A

Abstract

The application discloses a compressor and an air conditioning unit. The compressor includes: a first compression unit; a second compression unit; the driving unit is coaxially and drivingly connected with the first compression unit and the second compression unit and is positioned between the first compression unit and the second compression unit; and the transition unit comprises a transition unit main body and a bearing, wherein the transition unit main body is connected between the first compression unit and the driving unit and is provided with a bearing chamber, the bearing is arranged in the bearing chamber, and a driving shaft of the driving unit is supported on the bearing. The air conditioning unit comprises the compressor. Based on the compressor and the air conditioning unit provided by the application, the stability of the output shaft of the driving unit and the rotating shaft of the whole compressor can be improved, and the deflection is reduced, so that the multistage compressor can lighten the vibration, and the stable operation of the multistage compressor is easy to realize.

Description

Compressor and air conditioning unit

Technical Field

The application relates to the technical field of compressors, in particular to a compressor and an air conditioning unit.

Background

In the prior art, two-stage compression units of some multi-stage compressors, such as single-machine two-stage screw compressors, are respectively arranged at two sides of a motor, wherein an input shaft of a high-pressure stage male rotor is integrally formed with a driving shaft of the motor, the rotor of the motor is transmitted with the driving shaft through a key connection, and the driving shaft of the motor extending out of a motor part is connected with the input shaft of a low-pressure stage male rotor.

In the process of realizing the application, the inventor finds that the compressor has the problems of large vibration and difficult smooth running.

Disclosure of Invention

The application aims to provide a compressor and an air conditioning unit, and aims to solve the problems that two-stage compression units of a multistage compressor are large in vibration and difficult to stably run when being respectively arranged on two sides of a motor.

A first aspect of the present application provides a compressor comprising: a first compression unit; a second compression unit; the driving unit is coaxially and drivingly connected with the first compression unit and the second compression unit and is positioned between the first compression unit and the second compression unit; and the transition unit comprises a transition unit main body and a bearing, wherein the transition unit main body is connected between the first compression unit and the driving unit and is provided with a bearing chamber, the bearing is arranged in the bearing chamber, and a driving shaft of the driving unit is supported on the bearing.

In some embodiments, the operating pressure of the second compression unit is greater than the operating pressure of the first compression unit.

In some embodiments, the transition unit body comprises: the transition unit shell is respectively connected with the driving unit shell of the driving unit and the first unit shell of the first compression unit; a connection structure; and a bearing support structure connected within the transition unit housing by the connection structure and having the bearing chamber.

In some embodiments, the drive shaft of the drive unit is coaxially connected to the input shaft of the first compression unit by a coupling, and the bearing support structure further comprises a coupling chamber, the coupling being at least partially located within the coupling chamber.

In some embodiments, the drive unit comprises an electric motor, and the bearing support structure is located at least partially within a stator of the electric motor.

In some embodiments, the bearing support structure comprises a central barrel coaxial with the drive shaft, the central barrel being connected within the transition unit housing by the connection structure and having the bearing chamber, the central barrel further having a coupling chamber, the coupling being located at least partially within the coupling chamber.

In some embodiments, the cross-sectional dimension of one end of the unit is smaller than the cross-sectional dimension of the end of the circular table toward the first compression unit, the bearing chamber is a cylindrical space located at one end of the center tube near the driving unit, and the coupling chamber is a circular truncated cone-shaped space located at one end of the center tube near the first compression unit and having a cross-sectional dimension that becomes larger from the side of the cylindrical space to the side away from the cylindrical space.

In some embodiments, the transition unit further comprises a bearing seal plate mounted on an end face of the bearing support structure near one end of the drive unit and sealing the bearing in the bearing chamber, the bearing seal plate comprising a shaft bore in clearance fit with the drive shaft.

In some embodiments, the transition unit has an oil supply passage that supplies oil to the bearing, and the oil supply passage includes an end surface oil passage provided to the bearing seal plate toward one end surface of the bearing.

In some embodiments, the connection structure includes a plurality of connection ribs connected between the transition unit housing and the bearing support structure, the plurality of connection ribs being distributed along a circumferential direction of the transition unit housing.

In some embodiments, the connection structure further includes an extension rib connected to an end wall of the bearing support structure near one end of the first compression unit and extending to one side of the first compression unit, and a reinforcement rib connected between the extension rib and the transition unit housing.

In some embodiments, the transition unit has an oil supply passage supplying oil to the bearing, the oil supply passage including a first oil supply passage section provided inside at least a part of the connection rib.

In some embodiments, the cross-sectional dimension of the connecting rib provided with the first oil supply passage segment is greater than the cross-sectional dimension of the connecting rib not provided with the first oil supply passage segment.

In some embodiments, an extension rib is connected to an end wall of the bearing support structure near one end of the first compression unit and extends to one side of the first compression unit, and the reinforcement rib is connected between the extension rib and the transition unit housing, the extension rib extending from the connection rib provided with the first oil supply passage section.

In some embodiments, a perforation is provided in the extension rib, which is coaxially communicated with the first oil supply passage section in the corresponding connection rib, and a plug is provided at the end of the perforation.

In some embodiments, the transition unit housing has a cooling fluid inlet.

In some embodiments, the transition unit comprises an oil supply duct for supplying oil to the bearing, the oil supply duct comprising a second oil supply duct section arranged inside the bearing support structure.

In some embodiments, the transition unit includes an oil passage including: an oil supply passage for supplying oil to the bearing; and/or a connection oil passage for connecting the oil supply passage of the first compression unit and the oil supply passage of the driving unit.

In some embodiments, the transition unit includes a throttle member disposed within the oil supply passage.

In some embodiments, the transition unit housing has a thickened housing wall having a thickness greater than a thickness of a remaining portion of the transition unit housing, and the connecting oil passage is disposed within the thickened housing wall.

In some embodiments, the first compression unit is a first screw compression unit; and/or the second compression unit is a second screw compression unit, and an input shaft of the second compression unit is integrally formed with or connected with a driving shaft of the driving unit in a rotation-stopping way.

A second aspect of the present application provides an air conditioning unit comprising a compressor according to any one of the first aspect of the present application.

Based on the compressor and the air conditioning unit provided by the application, the transition unit main body of the compressor is connected between the first compression unit and the driving unit, the bearing is supported in the bearing chamber of the transition unit main body, and the output shaft of the driving unit is supported on the bearing, so that a supporting structure is added on the driving shaft between the driving unit and the first compression unit, the stability of the output shaft of the driving unit and the rotating shaft of the whole compressor can be improved, the deflection is reduced, the multistage compressor can lighten the vibration, and the stable operation of the multistage compressor is easy to realize.

Other features of the present application and its advantages will become apparent from the following detailed description of exemplary embodiments of the application, which proceeds with reference to the accompanying drawings.

Drawings

The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain the application and do not constitute a limitation on the application. In the drawings:

fig. 1 is a schematic cross-sectional structure of a compressor according to an embodiment of the present application.

Fig. 2 is a schematic partial structure of fig. 1.

Fig. 3 is a perspective view illustrating a transition unit body of the transition unit of the compressor of the embodiment shown in fig. 1.

Fig. 4 is a schematic cross-sectional structural view of the transition unit body shown in fig. 3.

Fig. 5 is a schematic view showing the flow of oil in the oil passage of the transition unit of the compressor of the embodiment shown in fig. 1.

Detailed Description

The following description of the embodiments of the present application will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present application, but not all embodiments. The following description of at least one exemplary embodiment is merely exemplary in nature and is in no way intended to limit the application, its application, or uses. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.

The relative arrangement of the components and steps, numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present application unless it is specifically stated otherwise. Meanwhile, it should be understood that the sizes of the respective parts shown in the drawings are not drawn in actual scale for convenience of description. Techniques, methods, and apparatus known to one of ordinary skill in the relevant art may not be discussed in detail, but should be considered part of the specification where appropriate. In all examples shown and discussed herein, any specific values should be construed as merely illustrative, and not a limitation. Thus, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further discussion thereof is necessary in subsequent figures.

In the description of the present application, it should be understood that the terms "first," "second," and the like are used for defining the components, and are merely for convenience in distinguishing the corresponding components, and the terms are not meant to have any special meaning unless otherwise indicated, so that the scope of the present application is not to be construed as being limited.

In the description of the present application, it should be understood that the azimuth or positional relationships indicated by the azimuth terms such as "front, rear, upper, lower, left, right", "lateral, vertical, horizontal", and "top, bottom", etc., are generally based on the azimuth or positional relationships shown in the drawings, merely to facilitate description of the present application and simplify the description, and these azimuth terms do not indicate and imply that the apparatus or elements referred to must have a specific azimuth or be constructed and operated in a specific azimuth, and thus should not be construed as limiting the scope of protection of the present application; the orientation word "inner and outer" refers to inner and outer relative to the contour of the respective component itself.

When the problems that the two-stage compression units of the multistage compressor are large in vibration and difficult to stably run when being respectively arranged at two sides of the motor are studied in depth, the inventor finds that the cantilever distance of the driving shaft is too long to cause large deflection of the driving shaft due to the fact that the driving shaft of the motor extending out of the motor part is connected with the input shaft of the low-pressure stage male rotor, and the problems that the multistage compressor is easy to vibrate and difficult to stably run are caused.

In order to solve the technical problems, on the basis of the analysis, the embodiment of the application provides a compressor. Further, an air conditioning unit comprising the compressor is also provided.

As shown in fig. 1 to 5, the compressor includes a first compression unit 100, a second compression unit 200, a driving unit 300, and a transition unit 400. The driving unit 300 is coaxially and drivingly connected with the first compression unit 100 and the second compression unit 200 and is located between the first compression unit 100 and the second compression unit 200. The transition unit 400 includes a transition unit body 410 and a bearing 420, the transition unit body 410 being connected between the first compression unit 100 and the driving unit 300 and having a bearing chamber 414A, the bearing 420 being disposed in the bearing chamber 414A, and the driving shaft 331 of the driving unit 300 being supported on the bearing 420.

Since the transition unit body 410 is connected between the first compression unit 100 and the driving unit 300, the bearing 420 is supported in the bearing chamber 414A of the transition unit body 410, and the driving shaft 331 of the driving unit 300 is supported on the bearing 420, thereby adding a supporting structure to the driving shaft 331 between the driving unit 300 and the first compression unit 100, the stability of the output shaft 331 of the driving unit 300 and the rotation shaft of the whole compressor can be improved, the deflection can be reduced, and the multistage compressor can reduce vibration, thereby facilitating the smooth operation of the multistage compressor.

Embodiments of the present application will be described in detail below with reference to fig. 1 to 5 by taking a single-stage two-stage screw compressor as an example.

As shown in fig. 1, the compressor of this embodiment includes a first compression unit 100, a second compression unit 200, a driving unit 300, a transition unit 400, and a coupling 500.

The first compression unit 100 is a first screw compression unit as a low pressure stage. As shown in fig. 1, the first compression unit 100 mainly includes a first compression unit body 110 and a first compression unit shaft support structure 120. In fig. 1, the first compression unit shaft support structure 120 is located at the left side of the first compression unit body 110.

The first compression unit body 110 includes a first male rotor 111, a first female rotor 112, and a first compression casing 113. The first male rotor 111 and the first female rotor 112 are both located within the first compression casing 113 and intermesh.

In fig. 1, the first compression unit shaft support structure 120 is located at the left end of the first compression unit body 110, and includes a first shaft support structure housing 123, a first male rotor support bearing 121 and a first female rotor support bearing 122 disposed within the first shaft support structure housing 123. A first male rotor rotating shaft 1111 (corresponding to the shaft-in shaft of the first compression unit) of the first male rotor 111 is supported on the first male rotor support bearing 121. The first female rotor rotating shaft 1121 of the first female rotor 112 is supported on the first female rotor support bearing 122. The first shaft support structure housing 123 is connected with the first compression housing 113 by a flange to constitute a first unit housing.

Two sets of support bearings for supporting the first male rotor 111 and the first female rotor 112, respectively, are provided at the right end inside the first compression casing 113.

The second compression unit 200 is a second screw compression unit as a high-pressure stage having a higher operating pressure than the first screw compression unit. As shown in fig. 1, the second compression unit 200 mainly includes a second compression unit body 210 and a second compression unit shaft support structure 220. In fig. 1, the second compression unit shaft support structure 220 is located at the left side of the second compression unit body 210.

The second compression unit body 210 includes a second male rotor 211, a second female rotor 212, and a second compression housing 213. The second male rotor 211 and the second female rotor 212 are both located within the second compression housing 213 and intermesh.

In fig. 1, the second compression unit shaft support structure 220 is located at the left end of the second compression unit body 210, and includes a second shaft support structure housing 223, and a second male rotor support bearing 221 and a second female rotor support bearing 222 disposed within the second shaft support structure housing 223. A second male rotor rotational shaft 2111 of the second male rotor 211 (corresponding to an input shaft of the second compression unit) is supported on a second male rotor support bearing 221. The second female rotor rotational shaft 2111 of the second female rotor 212 is supported on the second female rotor support bearing 222. The second bearing housing 223 is provided as an integral structure with the second compression housing 213, forming a second unit housing.

The driving unit 300 is coaxially and drivingly connected with the first compression unit 100 and the second compression unit 200 and is located between the first compression unit 100 and the second compression unit 200.

The driving unit 300 may be a motor. As shown in fig. 1, the driving unit 300 includes a driving unit housing 310, a stator 320, and a rotor 330. The rotor 330 rotates in synchronization with the driving shaft 331. In this embodiment, the rotor 330 is keyed to the drive shaft 331. The right end of the driving shaft 331 is connected to the input shaft of the first compression unit 100 (i.e., the first male rotor rotating shaft 1111 in this embodiment) through the coupling 500. The left end of the driving shaft 331 is integrally formed with the input shaft (i.e., the second male rotor rotating shaft 2111 in the present embodiment) of the second compression unit 200.

Two sets of support bearings respectively supporting the second male rotor 211 and the second female rotor 212 are provided at the inner left end of the driving unit housing 310.

As shown in fig. 1 and 2, in some embodiments, the transition unit 400 includes a transition unit body 410, a bearing 420, a throttle member 430, and a bearing seal plate 440.

As shown in fig. 1 to 5, the transition unit body 410 mainly includes a transition unit housing 411, a first flange 412, a second flange 413, a bearing support structure, and a connection structure 415.

The transition unit housing 411 is connected to the first unit housing of the first compression unit 100 and the driving unit housing 310 of the driving unit 300, respectively. As shown in fig. 1, the left end of the transition unit housing 411 is detachably connected to the driving unit housing 310 through a first flange 412, and the right end of the transition unit housing 411 is detachably connected to the first shaft support housing 123 through a second flange 413.

The bearing support structure is connected to the transitional unit housing 411 by a connection structure 415 and has a bearing chamber 414A, a bearing 420 is disposed in the bearing chamber 414A, and a drive shaft 331 of the drive unit 300 is supported on the bearing 420.

In some embodiments, the bearing support structure is located at least partially inside the stator 320 of the motor. The arrangement can utilize the internal space of the compressor as much as possible, and is beneficial to reducing the axial size of the compressor.

The drive shaft 331 of the drive unit 300 is coaxially connected to the input shaft 1111 of the first compression unit 100 via a coupling 500, the bearing carrier structure further comprising a coupling chamber 414B, the coupling 500 being at least partially located within the coupling chamber 414B.

As shown in fig. 1-5, in some embodiments, the bearing support structure includes a central barrel 414 coaxial with the drive shaft 331. The central barrel 414 is connected to the interior of the transition unit housing 411 by a connection structure 415.

The center tube 414 has both the bearing chamber 414A and the coupling chamber 414B described above. The coupling 500 is at least partially located within the coupling chamber 414B. The arrangement can utilize the internal space of the compressor as much as possible, and is beneficial to reducing the axial size of the compressor.

As shown in fig. 1 to 5, the outer peripheral surface of the center cylinder 414 forms a circular table. The cross-sectional dimension of the end of the circular table facing the driving unit 300 is smaller than the cross-sectional dimension of the end of the circular table facing the first compression unit 100. The bearing chamber 414A is a cylindrical space located at one end of the central cylinder 414 near the drive unit 300. The coupling chamber 414B is a truncated cone-shaped space having a larger cross-sectional area from the cylindrical space side to the side away from the cylindrical space side, which is located at one end of the center tube 414 near the first compression unit 100.

The inclination angle of the circular table surface with respect to the axial direction may be determined according to the coil angle of the stator 320 of the motor, and it is required to ensure that the circular table surface does not interfere with the coil, and it is also required that a cutter can easily process an inclined oil passage 416D described later. The dimensions of the frustoconical space and the length of the central bore 414 are related to the length of the envelope coupling 500 and the dimensions of the structure, such as the outer diameter, of the coupling 500.

The above arrangement of the center cylinder 414 enables the transition unit 400 to fully utilize the end space of the stator 320 and the outer space of the coupling 500 to provide corresponding structures without additionally occupying excessive compressor space, which is advantageous in reducing the overall size of the compressor. Through the setting of toper central section of thick bamboo 414, can effectively utilize the inner space, still do benefit to the oil feed oil circuit that sets up to bearing 420 lubrication and guarantee that the bearing 420 oil feed is unobstructed, simplify the compressor structure simultaneously, reduce cost.

As shown in fig. 1, 2 and 5, the transition unit 400 further includes a bearing seal plate 440. A bearing seal plate 440 is mounted to an end face of the bearing support structure near one end of the drive unit 300 to seal the bearing 420 within the bearing housing 414A. The bearing seal plate 440 includes a shaft bore that is clearance fit with the drive shaft 331.

As shown in fig. 1, the bearing support structure is fixedly connected to the transition unit housing 411 by a connection structure 415. In some embodiments, the connection structure 415 includes a plurality of connection ribs 415A connected between the transition unit housing 411 and the bearing support structure. The plurality of connection ribs 415A are distributed along the circumferential direction of the transition unit casing 411. In the embodiment shown in fig. 1, the connection structure 415 includes four connection ribs 415A uniformly distributed along the circumferential direction of the transition unit casing 411.

In some embodiments, the connection structure 415 may also include an extension rib 415B and a reinforcement rib 415C. The extension rib 415B is connected to an end wall of the bearing carrier structure located near one end of the first compression unit 100 and extends to one side of the first compression unit 100. The reinforcing rib 415C is connected between the extension rib 415B and the transition unit housing 411. The embodiment shown in fig. 1 includes an elongated rib 415B and corresponding stiffening ribs 415C. The provision of the extension rib 415B and the reinforcement rib 415C may increase the local strength of the bearing support structure.

As shown in fig. 1 to 5, the transition unit 400 includes an oil passage. The oil duct includes: an oil supply passage for supplying oil to the bearing 420; and/or a connection oil passage 416B for connecting the oil supply passage of the first compression unit 100 and the oil supply passage of the driving unit 300. In the embodiment shown in fig. 1, the oil gallery also includes a main oil gallery 414A.

In some embodiments, the transition unit 400 includes a throttle part 430, and the throttle part 430 is disposed in the oil supply passage.

In some embodiments, the oil passage of the transition unit 400 is mainly disposed in the transition unit body 410, with the oil supply passage portion disposed in the bearing seal plate 440.

As shown in fig. 1 to 5, the oil passage 406 in the transition unit body 410 includes a main oil passage 416A extending in the radial direction provided in the transition unit housing 411, a connecting oil passage 416B extending in the axial direction provided in the transition unit housing 411, and an oil supply passage. The oil supply passage includes a first oil supply flow passage section 416C provided in the connection rib 415A, a second oil supply flow passage section provided in the wall of the center tube 414, and an end surface flow passage section 441 provided on the end surface of the bearing seal plate 440 facing one end of the bearing 420. In some embodiments, the first oil supply flow passage segment 416C extends in a radial direction of the transition unit 400. In some embodiments, the second oil supply flow path segment includes an angled flow path segment 416D and an axial flow path segment 416E at an end of the center barrel 414 proximate the drive unit 300. The axial flow path segment 416E communicates with the end flow path segment 441 of the bearing seal plate 440.

In some embodiments, at least some of the plurality of connection ribs 415A are provided with a first oil feed channel segment 416C inside the connection ribs 415A. As shown in fig. 1 to 5, a first oil supply flow path section 416C is provided in one of the connection ribs 415A.

In some embodiments, to provide space for the first oil supply passage segment 416C and to avoid reducing the strength of the connection rib 415A due to the provision of the first oil supply passage segment 416C, the cross-sectional dimension of the connection rib 415A provided with the first oil supply passage segment 416C may be larger than the cross-sectional dimension of the connection rib 415A not provided with the first oil supply passage segment 416C.

In some embodiments, the extension rib 415B may be extended from the connection rib 415A provided with the first oil supply passage segment 416C to increase the supporting strength of the connection rib 415A corresponding to the extension rib 415B, which can reduce vibration during machining of the connection rib 415A and the first oil supply passage segment 416C provided in the center barrel 414 with a cutter, facilitate machining, and reduce costs.

In some embodiments, perforations are provided in the extension rib 415B that coaxially communicate with the oil supply channels in the corresponding connection rib 415A. A plug 417 is provided at the end of the perforation to seal. This arrangement facilitates machining of the inclined oil passage 416D.

As shown in fig. 1-5, in some embodiments, the transition unit housing 411 has a thickened housing wall with a thickness greater than the thickness of the remaining portion of the transition unit housing 411, and the connecting oil passage 416B is provided in the thickened housing wall. This arrangement provides more space for the arrangement of the connecting oil passage 416B on the one hand, and avoids the strength of the transitional unit housing 411 from being reduced by the arrangement of the connecting oil passage 416B on the other hand.

The oil path arrangement in the transition unit 400 makes full use of the structures such as the transition unit housing 411, the central cylinder 414, the connection structure 415 and the like of the transition unit body 410, does not need to additionally increase an oil pipe, can maximally utilize the internal space of the compressor, simplifies the structure of the transition unit, does not excessively increase the weight due to the arrangement of the oil path, and can reduce the cost.

Referring to fig. 1 to 5 (each arrow direction in fig. 5 represents the oil flow direction). The oil enters the main oil passage 416A and branches into a left and a right connecting oil passages 416B and an oil supply passage. The left and right connecting oil passages 416B are respectively communicated with the oil supply passage of the driving unit 300 and the oil supply passage of the first compression unit 100. A throttle member 430 is disposed within the first flow path segment 416C for regulating the amount of oil reaching the bearing 420. The throttling member 430 may be a throttle plug. The oil entering the oil supply passage sequentially flows through the first flow passage section 416C and the throttling part 430, the inclined flow passage section 416D, the axial flow passage section 416E and the end face flow passage section 441 arranged therein, then enters the bearing 420 to lubricate the bearing 420, and the oil after lubrication of the bearing 420 flows out through a gap between the driving shaft 331 and the bearing sealing plate 440 and enters the second compression unit 200 along with the exhaust gas of the first compression unit 100.

To prevent foreign matter from entering the oil path before the transition unit 400 is not connected to the oil supply line, a blind flange 418 may be provided for blocking.

In addition, as shown in fig. 3, a cooling fluid inlet 4111 may also be provided on the transition unit housing 411. The working medium (e.g., refrigerant) compressed by the liquid compressor may be introduced from the cooling fluid inlet 4111, and after entering the transitional unit housing 411, the liquid working medium may be mixed with the medium-pressure gas working medium compressed by the first compression unit 100, and the mixed fluid may cool the motor when flowing through the motor, and then enter the second compression unit 200 for further compression.

In the compressor of the above embodiment, when the transition unit 400 is actually assembled, the outer ring of the radial bearing 420 and the bearing sealing plate 440 are pre-assembled on the transition unit body 410, the motor is pre-assembled with the first compression unit 200, the inner ring of the radial bearing 420 is pre-assembled on the driving shaft 331, and assembled together with the second compression unit 200 and the driving unit 300, the throttling part 430 may be pre-assembled in the oil path of the transition unit 400, or assembled after the transition unit 400 is assembled with the first compression unit 100 and the driving unit 300.

The air conditioning unit provided by the embodiment comprises the compressor. The air conditioning unit has the corresponding advantages of the compressor.

Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present application and not for limiting the same; while the application has been described in detail with reference to the preferred embodiments, those skilled in the art will appreciate that: modifications may be made to the specific embodiments of the present application or equivalents may be substituted for part of the technical features thereof; without departing from the spirit of the application, it is intended to cover the scope of the application as claimed.

Claims

1. A compressor, comprising:

a first compression unit (100);

a second compression unit (200);

a driving unit (300) coaxially and drivingly connected with the first compression unit (100) and the second compression unit (200) and positioned between the first compression unit (100) and the second compression unit (200); and

a transition unit (400) comprising a transition unit body (410) and a bearing (420), the transition unit body (410) being connected between the first compression unit (100) and the drive unit (300) and having a bearing chamber (414A), the bearing (420) being arranged in the bearing chamber (414A), a drive shaft (331) of the drive unit (300) being supported on the bearing (420);

wherein the transition unit body (410) comprises:

a transition unit housing (411) connected to the drive unit housing (310) of the drive unit (300) and the first unit housing of the first compression unit (100), respectively;

-a connection structure (415); and

a bearing carrier structure connected by the connection structure (415) within the transition unit housing (411) and having the bearing chamber (414A).

2. The compressor according to claim 1, characterized in that the operating pressure of the second compression unit (200) is greater than the operating pressure of the first compression unit (100).

3. The compressor according to claim 1, characterized in that the drive shaft (331) of the drive unit (300) is coaxially connected with the input shaft (1111) of the first compression unit (100) by means of a coupling (500), the bearing carrier structure further comprising a coupling chamber (414B), the coupling (500) being at least partially located within the coupling chamber (414B).

4. The compressor of claim 1, wherein the drive unit (300) comprises an electric motor, and the bearing support structure is located at least partially within a stator (320) of the electric motor.

5. The compressor of claim 1, wherein the bearing support structure comprises a central cylinder (414) coaxial with the drive shaft (331), the central cylinder (414) being connected by the connection structure (415) within the transition unit housing (411) and having the bearing chamber (414A), the central cylinder (414) further having a coupling chamber (414B), the coupling (500) being located at least partially within the coupling chamber (414B).

6. The compressor according to claim 5, wherein the outer peripheral surface of the center cylinder (414) includes a circular table surface, a cross-sectional dimension of an end of the circular table surface facing the driving unit (300) is smaller than a cross-sectional dimension of an end of the circular table surface facing the first compression unit (100), the bearing chamber (414A) is a cylindrical space located at an end of the center cylinder (414) near the driving unit (300), and the coupling chamber (414B) is a circular table-shaped space located at an end of the center cylinder (414) near the first compression unit (100) and having a cross-sectional dimension that becomes larger from the cylindrical space side to a side away from the cylindrical space.

7. The compressor of claim 1, wherein the transition unit (400) further comprises a bearing seal plate (440), the bearing seal plate (440) being mounted on an end face of the bearing support structure near an end of the drive unit (300) and sealing the bearing (420) within the bearing chamber (414A), the bearing seal plate (440) comprising a shaft bore in clearance fit with the drive shaft (331).

8. The compressor of claim 7, wherein the transition unit (400) has an oil supply passage that supplies oil to the bearing (420), the oil supply passage including an end surface oil passage (441) provided to the bearing seal plate (440) toward one side end surface of the bearing (420).

9. The compressor of claim 1, wherein the connection structure (415) comprises a plurality of connection ribs (415A) connected between the transition unit housing (411) and the bearing support structure, the plurality of connection ribs (415A) being distributed along a circumferential direction of the transition unit housing (411).

10. The compressor of claim 9, wherein the connection structure (415) further comprises an extension rib (415B) and a reinforcement rib (415C), the extension rib (415B) being connected to an end wall of the bearing support structure located near one end of the first compression unit (100) and extending to one side of the first compression unit (100), the reinforcement rib (415C) being connected between the extension rib (415B) and the transition unit housing (411).

11. The compressor of claim 10, wherein the transition unit (400) has an oil supply passage supplying oil to the bearing (420), the oil supply passage including a first oil supply passage segment (416C) provided inside at least a portion of the connection rib (415A).

12. The compressor of claim 11, wherein a cross-sectional dimension of the connection rib (415A) provided with the first oil supply passage segment (416C) is larger than a cross-sectional dimension of the connection rib (415A) not provided with the first oil supply passage segment (416C).

13. The compressor of claim 11, wherein the connection structure (415) further comprises an extension rib (415B) and a reinforcement rib (415C), the extension rib (415B) being connected to an end wall of the bearing support structure located near one end of the first compression unit (100) and extending to one side of the first compression unit (100), the reinforcement rib (415C) being connected between the extension rib (415B) and the transition unit housing (411), the extension rib (415B) extending from the connection rib (415A) provided with the first oil supply channel section (416C).

14. The compressor of claim 11, wherein a perforation is provided in the extension rib (415B) coaxially communicating with the first oil supply passage section (416C) in the corresponding connection rib (415A), the perforation being provided with a plug (417) at the end.

15. The compressor of claim 1, wherein the transition unit housing (411) has a cooling fluid inlet (4111).

16. The compressor of claim 1, wherein the transition unit (400) comprises an oil supply duct for supplying oil to the bearing (420), the oil supply duct comprising a second oil supply duct section (416 d,416 e) arranged inside the bearing carrier structure.

17. The compressor of claim 1, wherein the transition unit (400) comprises an oil passage comprising:

an oil supply passage for supplying oil to the bearing (420); and/or the number of the groups of groups,

and a connection oil passage (416B) for connecting the oil supply passage of the first compression unit (100) and the oil supply passage of the driving unit (300).

18. The compressor of claim 17, wherein the transition unit (400) includes a throttling member (430), the throttling member (430) being disposed within the oil supply passage.

19. The compressor of claim 17, wherein the transition unit housing (411) has a thickened shell wall having a thickness greater than a thickness of a remaining portion of the transition unit housing (411), the connection oil passage (416B) being disposed within the thickened shell wall.

20. The compressor according to any one of claims 1 to 19, wherein,

the first compression unit (100) is a first screw compression unit; and/or the number of the groups of groups,

the second compression unit (200) is a second screw compression unit, and an input shaft of the second compression unit (200) is integrally formed with or connected with a driving shaft (331) of the driving unit (300) in a rotation-stopping manner.

21. An air conditioning unit comprising a compressor, wherein the compressor is a compressor according to any one of claims 1 to 20.