Compressors for optimizing interior space

Abstract

The present disclosure relates to a compressor, comprising: a housing (2); a motor stator (3) and a motor rotor (8), both of which are arranged in the housing (2); and a first gas bearing, which is arranged in the housing (2) and supports the motor rotor (8); the compressor further comprises: a gas supply channel, which is arranged in the housing (2) and is used to connect an external gas source and supply working gas provided by the external gas source to the first gas bearing; and an exhaust device, whose air intake is located in the housing (2) and is used to discharge the working gas that flows out of the gap between the first gas bearing and the motor rotor (8) and flows to the first side of the motor stator (3) through the gap between the motor stator (3) and the motor rotor (8) to the outside of the housing (2); wherein the first side of the motor stator (3) is the side of the motor stator (3) that is axially away from the first gas bearing. The embodiment of the present disclosure can optimize the internal space of the compressor.

Description

Technical Field

[0001] The present disclosure relates to a compressor for optimizing an inner space. Background Art

[0002] A centrifugal compressor is a compressor that uses high-speed impeller rotation to generate centrifugal force to compress gas. At present, centrifugal compressors mainly use oil-lubricated bearings and electromagnetic bearings to support the rotor. Among them, oil-lubricated bearings require an additional oil supply system, which makes the structure of the centrifugal compressor complex. In addition, friction between the oil and the rotor will cause energy loss. In addition, the lubricating oil may leak into the refrigerant, causing refrigerant contamination. Electromagnetic bearings have high control requirements and poor resistance to system impact. In addition, an additional power-off protection system is required.

[0003] The static gas bearing is an oil-free bearing that uses gas pressure to support the rotor. This type of bearing has a simple structure, low friction between the gas and the rotor, and does not require a complex control system. The static gas bearing uses external gas supply, and its gas pressure is easy to adjust. It can continuously supply gas during the start-stop phase of the compressor, avoiding the contact friction between the rotor and the bearing caused by insufficient gas supply during the start-stop phase, and improving system stability. Summary of the invention

[0004] The inventors have found that it is difficult for the compressor of the related art to accurately pass the external gas into the gas bearing with little loss, and it is often necessary to set up an additional gas collection device, which occupies the internal space of the compressor.

[0005] In view of this, an embodiment of the present disclosure provides a compressor capable of optimizing the internal space of the compressor.

[0006] In one aspect of the present disclosure, a compressor is provided, comprising:

[0007] case;

[0008] A motor stator and a motor rotor are both disposed in the housing; and

[0009] a first gas bearing, disposed in the housing and supporting the motor rotor;

[0010] Characterized in that the compressor also includes:

[0011] a gas supply passage, disposed in the housing, for connecting to an external gas source and supplying working gas provided by the external gas source to the first gas bearing; and

[0012] an exhaust device, whose air intake port is located in the housing, and is used to discharge the working gas that flows out of the gap between the first gas bearing and the motor rotor and flows to the first side of the motor stator through the gap between the motor stator and the motor rotor to the outside of the housing;

[0013] The first side of the motor stator is a side of the motor stator that is axially away from the first gas bearing.

[0014] In some embodiments, a cooling gas flow channel is provided between the housing and the motor stator, and an outlet of the cooling gas flow channel is located on the second side of the motor stator, so that the cooling gas flowing out of the outlet of the cooling gas flow channel can be mixed with the working gas flowing out of the gap between the first gas bearing and the motor rotor on the second side of the motor stator, and then flow to the first side of the motor stator through the gap between the motor stator and the motor rotor;

[0015] The second side of the motor stator is a side of the motor stator that is axially close to the first gas bearing.

[0016] In some embodiments, the first gas bearing comprises: a first thrust gas bearing supporting the motor rotor in the axial direction and a first radial gas bearing supporting the motor rotor in the radial direction;

[0017] The air supply channel comprises:

[0018] a first gas supply passage, disposed in the housing and used to connect to an external gas source and supply the working gas provided by the external gas source to the first radial gas bearing;

[0019] The second gas supply passage is arranged in the shell and is used to connect to an external gas source and supply the working gas provided by the external gas source to the first thrust gas bearing.

[0020] In some embodiments, the first air supply channel and the second air supply channel are separated from each other in the housing.

[0021] In some embodiments, an air inlet of the first air supply channel on the housing and an air inlet of the second air supply channel on the housing are located in opposite directions of the housing.

[0022] In some embodiments, the compressor further comprises: a second gas bearing disposed in the housing and supporting the motor rotor;

[0023] The air supply channel also includes:

[0024] The third gas supply channel is arranged in the shell, and is used to connect to an external gas source and supply the working gas provided by the external gas source to the second gas bearing.

[0025] In some embodiments, the third air supply channel is communicated with the first air supply channel and shares the same air inlet on the shell.

[0026] In some embodiments, the compressor further comprises:

[0027] The first-stage impeller and the second-stage impeller are fixedly connected to two ends of the motor rotor respectively;

[0028] A second gas bearing is disposed adjacent to the secondary impeller and supports the motor rotor in a radial direction; and

[0029] A bearing seat, disposed in the housing and supporting the second gas bearing;

[0030] Among them, the gas supply channel is also connected to the second gas bearing, and is used to supply the working gas provided by the external gas source to the second gas bearing. The bearing seat has a bearing mounting hole for supporting the second gas bearing, and a vent hole group is provided between the bearing mounting hole and the surface of the bearing seat close to the motor stator, which is used to guide the working gas flowing out of the gap between the second gas bearing and the motor rotor to flow to the side of the bearing seat close to the motor stator.

[0031] In some embodiments, the compressor further comprises: an axial sealing mechanism, disposed between the motor rotor and the bearing seat, for forming a sealing effect on one side of the second gas bearing in the axial direction.

[0032] In some embodiments, the axial sealing mechanism includes: a comb tooth seal, which is sleeved on the motor rotor and fixedly connected to the bearing seat, and a ventilation groove group is provided on the flange of the comb tooth seal close to the second gas bearing side, and the ventilation groove group is at least partially connected to the ventilation hole group.

[0033] In some embodiments, the ventilation hole group includes at least one ventilation hole distributed along the circumference of the bearing seat, and the ventilation groove group includes at least one ventilation groove distributed along the circumference of the comb tooth seal, the number of the ventilation holes is the same as the number of the ventilation grooves, and each ventilation groove is aligned with each ventilation hole, respectively.

[0034] In some embodiments, the compressor is a centrifugal compressor.

[0035] In some embodiments, the first gas bearing is a hydrostatic gas bearing.

[0036] In some embodiments, the second gas bearing is a hydrostatic gas bearing.

[0037] Therefore, according to an embodiment of the present disclosure, a supply flow passage is provided in the shell to supply working gas outside the shell to the first gas bearing, and the working gas flowing out from the gap between the first gas bearing and the motor rotor and flowing to the other side of the motor stator through the gap between the motor stator and the motor rotor is discharged to the outside of the shell, so that the external working gas can be accurately supplied to the first gas bearing and absorbed by the exhaust device after passing through the gap between the motor stator and the motor rotor, thereby eliminating the need to provide an additional gas collection device, thereby optimizing the internal space of the compressor. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] The accompanying drawings, which constitute a part of the specification, illustrate embodiments of the present disclosure and, together with the description, serve to explain the principles of the present disclosure.

[0039] The present disclosure may be more clearly understood from the following detailed description with reference to the accompanying drawings, in which:

[0040] Figure 1 is a cross-sectional schematic diagram of some embodiments of the compressor according to the present disclosure;

[0041] Figure 2 is a schematic structural diagram of a bearing seat according to some embodiments of the compressor disclosed herein;

[0042] Figure 3 yes Figure 2 Schematic diagram of the AA section;

[0043] Figure 4 is a schematic structural diagram of a comb seal according to some embodiments of the compressor disclosed herein;

[0044] Figure 5 yes Figure 4 Schematic diagram of the BB section.

[0045] It should be understood that the size of each part shown in the accompanying drawings is not drawn according to the actual proportional relationship. In addition, the same or similar reference numerals represent the same or similar components. DETAILED DESCRIPTION

[0046] Various exemplary embodiments of the present disclosure will now be described in detail with reference to the accompanying drawings. The description of the exemplary embodiments is merely illustrative and is in no way intended to limit the present disclosure and its application or use. The present disclosure can be implemented in many different forms and is not limited to the embodiments described herein. These embodiments are provided to make the present disclosure thorough and complete and to fully express the scope of the present disclosure to those skilled in the art. It should be noted that unless otherwise specifically stated, the relative arrangement of the components and steps described in these embodiments should be interpreted as being merely exemplary and not as a limitation.

[0047] The words "first", "second" and similar words used in this disclosure do not indicate any order, quantity or importance, but are only used to distinguish different parts. The words "include" or "comprise" and similar words mean that the elements before the word include the elements listed after the word, and do not exclude the possibility of including other elements. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0048] In the present disclosure, when a specific device is described as being located between a first device and a second device, there may or may not be an intermediate device between the specific device and the first device or the second device. When a specific device is described as being connected to other devices, the specific device may be directly connected to the other device without an intermediate device, or may not be directly connected to the other device but have an intermediate device.

[0049] All terms (including technical terms or scientific terms) used in the present disclosure have the same meanings as those understood by ordinary technicians in the field to which the present disclosure belongs, unless otherwise specifically defined. It should also be understood that terms defined in general dictionaries, such as general dictionaries, should be interpreted as having meanings consistent with their meanings in the context of the relevant technology, and should not be interpreted in an idealized or extremely formal sense, unless explicitly defined herein.

[0050] Technologies, methods, and equipment known to ordinary technicians in the relevant art may not be discussed in detail, but where appropriate, the technologies, methods, and equipment should be considered as part of the specification.

[0051] like Figure 1 , which is a cross-sectional schematic diagram of some embodiments of the compressor according to the present disclosure. Figure 1In some embodiments, the compressor includes: a housing 2, a motor stator 3, a motor rotor 8 and a first gas bearing. The compressor may be a centrifugal compressor. In other embodiments, the compressor may also be other types of compressors, such as a screw compressor or a vane compressor. The motor stator 3 and the motor rotor 8 are both arranged in the housing 2. A gap is formed between the motor stator 3 and the motor rotor 8. At least one impeller may be included in the housing 2. At least one impeller is fixedly connected to the motor rotor 8 and can rotate with the rotation of the motor rotor 8. The first gas bearing is arranged in the housing 2 and supports the motor rotor 8. The first gas bearing is preferably a static pressure gas bearing.

[0052] In some embodiments, the compressor further comprises a gas supply passage. The gas supply passage is disposed in the housing 2 and is used to connect to an external gas source and supply the working gas provided by the external gas source to the first gas bearing. The external gas source can enter the first gas bearing accurately and with less loss through the gas supply passage.

[0053] refer to Figure 1 In some embodiments, the first gas bearing may include: first thrust gas bearings 12, 14 and a first radial gas bearing 11. The first thrust gas bearings 12 and 14 are respectively located on the right and left sides of the thrust plate 18 fixedly connected to the motor rotor, and can support the motor rotor 8 in the axial direction. The first radial gas bearing 11 is sleeved on the motor rotor 8 and supports the motor rotor 8 in the radial direction.

[0054] For the first gas bearing, the gas supply channel may include: a first gas supply channel 10 and a second gas supply channel 16. The first gas supply channel 10 is disposed in the housing 2 and is used to connect to an external gas source and supply the working gas provided by the external gas source to the first radial gas bearing 11. Figure 1 In the embodiment, the first gas supply channel 10 can be opened inside the shell wall of the shell 2, and can include multiple sub-channels in the horizontal and vertical directions. These linear sub-channels can further reduce the pressure loss of the gas along the way. The end of the first gas supply channel 10 can be directly aligned with the outer ring of the first radial gas bearing 11, so that the working gas from the external gas source can be accurately and less lost into the first radial gas bearing 11. The working gas introduced into the first radial gas bearing 11 can penetrate into the gap between the first radial gas bearing 11 and the motor rotor 8 through the porous material of the bearing, forming a static pressure gas support effect.

[0055] The second gas supply channel 16 is arranged in the housing 2, and is used to connect an external gas source and supply the working gas provided by the external gas source to the first thrust gas bearings 12 and 14. A part of the second gas supply channel 16 can be opened inside the shell wall of the housing 2, and its end is aligned with the right end face of the first thrust gas bearing 12, while the other part can be opened inside the diffuser 13 arranged closely to the first thrust gas bearing 14, and its end is aligned with the left end face of the first thrust gas bearing 14, so that the working gas from the external gas source can be accurately and less lost into the first thrust gas bearings 12 and 14. The second gas supply channel 16 may include a plurality of sub-channels in the horizontal and vertical directions, and these linear sub-channels can further reduce the pressure loss of the gas along the way. The working gas introduced into the first thrust gas bearings 12 and 14 can penetrate into the gaps between the first thrust gas bearings 12 and 14 and the thrust disc 18 through the porous material of the bearings, forming a static pressure gas support effect.

[0056] Considering that the gas pressures required for thrust gas bearings and radial gas bearings may be different, in some embodiments, the first gas supply channel 10 and the second gas supply channel 16 are separated from each other in the shell 2. In other words, the first gas supply channel 10 and the second gas supply channel 16 are independent of each other and are not directly connected in the internal flow channel of the shell. For example, the air inlet 9 of the first gas supply channel 10 on the outside of the shell and the air inlet 1 of the second gas supply channel 16 on the outside of the shell are respectively arranged at different parts of the shell 2, and the first gas supply channel 10 is not directly connected to the second gas supply channel 16. In this way, the air inlet 9 can be connected to an external gas source of different pressures with the air inlet 1, thereby meeting the working gas supply of the gas bearing that is more in line with the working conditions, and making the structure of the gas supply channel simpler.

[0057] In order to facilitate the connection between the external air source and the air inlet and reduce the interference problem when connecting external pipelines, it is preferred to arrange the air inlet 9 of the first air supply duct 10 on the shell 2 and the air inlet 1 of the second air supply duct 16 on the shell 2 in opposite directions of the shell 2, for example, below and above the shell 2.

[0058] In some embodiments, the compressor further comprises an exhaust device. Figure 1 The arrows indicate the direction of the air flow, and the air intake port of the exhaust device is located in the housing 2, which can flow out from the gap between the first gas bearing and the motor rotor 8, and flow through the gap between the motor stator 3 and the motor rotor 8 to the first side of the motor stator 3 (i.e., the side of the motor stator 3 away from the first gas bearing in the axial direction, corresponding to Figure 1The working gas in the area B) is discharged to the outside of the housing 2. In this way, the working gas input from the outside to the compressor can be discharged from the compressor to the outside more easily to ensure the stability of the gas supply without setting a special device for collecting the working gas, thereby optimizing the internal space of the compressor. In addition, the flow of the working gas in the gap between the stator and the rotor can also achieve the cooling effect of the motor stator and the motor rotor.

[0059] exist Figure 1 In the embodiment, a cooling gas flow channel 15 may be provided between the housing 2 and the motor stator 3. The outlet of the cooling gas flow channel 15 is located on the second side of the motor stator 3 (i.e., the side of the motor stator 3 close to the first gas bearing in the axial direction). In this way, the cooling gas entering the cooling gas flow channel 15 may flow out from the outlet of the cooling gas flow channel 15 and be combined with the working gas flowing out from the gap between the first gas bearing and the motor rotor 8 on the second side of the motor stator (corresponding to the side of the first gas bearing). Figure 1 The mixed gas medium then flows to the first side of the motor stator 3 (corresponding to the first side of the motor stator 3) through the gap between the motor stator 3 and the motor rotor 8. Figure 1 Area B).

[0060] After the cooling gas is mixed with the working gas, it can cool the motor stator 3 and the motor rotor 8 when passing between the motor stator 3 and the motor rotor 8, and can also be absorbed by the exhaust device and discharged to the outside of the shell, so that the gas circulation inside and outside the compressor is smoother, ensuring the stability of the internal operation of the compressor. The cooling gas and the working gas can be the same medium or different media. Preferably, the cooling gas and the working gas are both refrigerants compressed by the compressor.

[0061] refer to Figure 1 In some embodiments, the compressor includes two-stage impellers, which are fixedly connected to both ends of the motor rotor 8, respectively. The first thrust gas bearings 12, 14 and the first radial gas bearing 11 in the first gas bearing are both arranged on the motor rotor 8 on the side close to the secondary impeller 20 relative to the primary impeller 19. The compressor also includes a second gas bearing 6, which supports the motor rotor 8 at a position on the side of the secondary impeller 20 close to the first impeller 19. The second gas bearing is preferably a static pressure gas bearing.

[0062] In order to install the second gas bearing 6, the second gas bearing 6 can be supported by a bearing seat 5 arranged in the housing 2. The gas supply channel may also include: a third gas supply channel 17 arranged in the housing 2. The third gas supply channel 17 is used to connect to an external gas source and supply the working gas provided by the external gas source to the second gas bearing 6.

[0063] Considering that the working conditions of the first radial gas bearing and the second gas bearing 6, which are also radial gas bearings, are relatively similar, the third gas supply channel 17 and the second gas supply channel 16 can be interconnected and share the same air inlet on the shell 2 to simplify the gas supply channel.

[0064] refer to Figure 1-Figure 3 In some embodiments, the gas supply channel 10 may be in communication with the second gas bearing 6 (directly, or via a channel 53 provided on the bearing seat 5) to supply the working gas provided by the external gas source to the second gas bearing 6. The bearing seat 5 has a bearing mounting hole 52 for supporting the second gas bearing 6, and a vent group is provided between the bearing mounting hole 52 and the surface of the bearing seat 5 on the side close to the motor stator 3. The vent group may include at least one vent 51 distributed along the circumference of the bearing seat 5. The vent group can guide the working gas flowing out of the gap between the second gas bearing 6 and the motor rotor 8 to flow to the area B of the bearing seat 5 on the side close to the motor stator 3. The working gas entering the area B can be absorbed by the exhaust device and discharged out of the housing.

[0065] refer to Figure 1 In some embodiments, the compressor further comprises: an axial sealing mechanism, which is arranged between the motor rotor 8 and the bearing seat 5, and is used to form a sealing effect on one side of the second gas bearing 6 in the axial direction. Figure 4-Figure 5 In some embodiments, the axial sealing mechanism includes: a comb-tooth seal 7. The comb-tooth seal 7 is sleeved on the motor rotor 8 and fixedly connected to the bearing seat 5. A venting groove group is provided on the flange 74 of the comb-tooth seal 7 on the side close to the second gas bearing 6, and the venting groove group is at least partially connected to the vent hole group. The comb-tooth seal 7 is also provided with comb teeth 71 arranged along the axial direction and an assembly hole 72 for assembly with the bearing seat 5.

[0066] The ventilation groove group may include at least one ventilation groove group distributed along the circumference of the comb tooth seal 7. In order to allow the working gas flowing out from the gap between the second gas bearing 6 and the motor rotor 8 to be discharged smoothly, it is preferred that the number of ventilation holes 51 is the same as the number of ventilation grooves 71, for example, both are 5 (or both are 3 or 7, etc.), and each ventilation groove 71 is aligned with each ventilation hole 51 respectively.

[0067] So far, various embodiments of the present disclosure have been described in detail. In order to avoid obscuring the concept of the present disclosure, some details known in the art are not described. Based on the above description, those skilled in the art can fully understand how to implement the technical solution disclosed here.

[0068] Although some specific embodiments of the present disclosure have been described in detail by way of examples, it should be understood by those skilled in the art that the above examples are for illustration only and are not intended to limit the scope of the present disclosure. It should be understood by those skilled in the art that the above embodiments may be modified or some technical features may be replaced by equivalents without departing from the scope and spirit of the present disclosure. The scope of the present disclosure is defined by the appended claims.

Claims

1. A compressor, comprising: Housing (2); The motor stator (3) and the motor rotor (8) are both arranged in the housing (2); and A first gas bearing, disposed in the housing (2) and supporting the motor rotor (8); Characterized in that the compressor also includes: a gas supply passage, arranged in the housing (2), for connecting to an external gas source and supplying working gas provided by the external gas source to the first gas bearing; and an exhaust device, the air intake of which is located in the housing (2), and is used to discharge the working gas that flows out of the gap between the first gas bearing and the motor rotor (8) and flows to the first side of the motor stator (3) through the gap between the motor stator (3) and the motor rotor (8) to the outside of the housing (2); The first side of the motor stator (3) is a side of the motor stator (3) that is axially away from the first gas bearing; the first gas bearing comprises: a first thrust gas bearing (12, 14) that supports the motor rotor (8) in the axial direction and a first radial gas bearing (11) that supports the motor rotor (8) in the radial direction; the gas supply channel comprises: a first gas supply channel (10) that is arranged in the housing (2) and is used to connect to an external gas source and supply the working gas provided by the external gas source to the first radial gas bearing (11); and a second gas supply channel (16) that is arranged in the housing (2) and is used to connect to an external gas source and supply the working gas provided by the external gas source to the first thrust gas bearing (12, 14).

2. The compressor according to claim 1, characterized in that A cooling gas flow channel (15) is provided between the housing (2) and the motor stator (3), and an outlet of the cooling gas flow channel (15) is located on the second side of the motor stator (3), so that the cooling gas flowing out of the outlet of the cooling gas flow channel (15) can be mixed with the working gas flowing out of the gap between the first gas bearing and the motor rotor (8) on the second side of the motor stator (3), and then flow to the first side of the motor stator (3) through the gap between the motor stator (3) and the motor rotor (8); The second side of the motor stator (3) is a side of the motor stator (3) that is axially close to the first gas bearing.

3. The compressor according to claim 1, characterized in that The first air supply channel (10) and the second air supply channel (16) are arranged in a manner separated from each other in the shell (2).

4. The compressor according to claim 3, characterized in that An air inlet of the first air supply channel (10) on the shell (2) and an air inlet of the second air supply channel (16) on the shell (2) are located in opposite directions of the shell (2).

5. The compressor according to claim 1, characterized in that Also includes: A second gas bearing (6) is arranged in the housing and supports the motor rotor (8); The air supply channel also includes: A third gas supply channel (17) is arranged in the housing (2) and is used to connect to an external gas source and supply the working gas provided by the external gas source to the second gas bearing (6).

6. The compressor according to claim 5, characterized in that The third air supply channel (17) and the first air supply channel (10) are in communication with each other and share the same air inlet on the shell (2).

7. The compressor according to claim 1, characterized in that Also includes: A first-stage impeller (19) and a second-stage impeller (20) are respectively fixedly connected to two ends of the motor rotor; A second gas bearing (6) is arranged at a position adjacent to the secondary impeller (20) and supports the motor rotor (8) in a radial direction; and A bearing seat (5) is arranged in the housing (2) and supports the second gas bearing (6); The gas supply channel is also connected to the second gas bearing (6) for supplying the working gas provided by the external gas source to the second gas bearing (6); the bearing seat (5) has a bearing mounting hole (52) for supporting the second gas bearing (6); a vent hole group is provided between the bearing mounting hole (52) and a surface of the bearing seat (5) on a side close to the motor stator (3) for guiding the working gas flowing out of the gap between the second gas bearing (6) and the motor rotor (8) to flow to the side of the bearing seat (5) close to the motor stator (3).

8. The compressor according to claim 7, characterized in that Also includes: An axial sealing mechanism is arranged between the motor rotor (8) and the bearing seat (5) and is used to form a sealing effect on one side of the second gas bearing (6) in the axial direction.

9. The compressor according to claim 8, characterized in that The axial sealing mechanism comprises: a comb-tooth seal (7), the comb-tooth seal (7) being sleeved on the motor rotor (8) and fixedly connected to the bearing seat (5), a venting groove group being provided on a flange (74) on a side of the comb-tooth seal (7) close to the second gas bearing (6), the venting groove group being at least partially connected to the vent hole group.

10. The compressor according to claim 9, characterized in that The ventilation hole group comprises at least one ventilation hole (51) distributed along the circumference of the bearing seat (5), and the ventilation groove group comprises at least one ventilation groove (71) distributed along the circumference of the comb tooth seal (7), the number of the ventilation holes (51) is the same as the number of the ventilation grooves (71), and each ventilation groove (71) is aligned with each ventilation hole (51).

11. The compressor according to claim 1, characterized in that The compressor is a centrifugal compressor.

12. The compressor according to claim 1, characterized in that The first gas bearing is a static pressure gas bearing.

13. The compressor according to claim 7, characterized in that The second gas bearing is a static pressure gas bearing.

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