Compressor and air conditioning unit

Abstract

The utility model provides a compressor and an air conditioning unit. The compressor comprises a shell; the driving mechanism is arranged in the shell body; two groups of compression assemblies; and a sealing structure. According to the compressor and the air conditioning unit provided by the utility model, the sealing structure is arranged between the compression assembly and the driving mechanism, and the refrigerant of the compression assembly is prevented from being migrated by utilizing the sealing structure, so that the displacement of each compression assembly is ensured, and the compression efficiency is ensured; meanwhile, the refrigerant cannot flow to the driving mechanism in a leakage migration mode, so that the situation that the refrigerant used for cooling the driving mechanism flows along with the migrated refrigerant is avoided, and the problem that high-temperature and high-pressure refrigerant of the compression assembly impacts the driving mechanism to cause demagnetization of magnetic steel in the driving mechanism can also be avoided; therefore, the working reliability of the driving mechanism is guaranteed, the risk of heating demagnetization of the driving mechanism is reduced, the service life of the driving mechanism is prolonged, and the purpose of improving the reliability and the working efficiency of the compressor is achieved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of compression equipment, especially a compressor and air conditioning unit. BACKGROUND

[0002] Compared with screw compressor and scroll compressor, centrifugal compressor can provide higher pressure ratio gas source, and its working principle is to rely on motor to drive impeller high speed rotation and produce centrifugal force to enhance refrigerant gas speed, then through expansion chamber to complete the conversion of kinetic energy to pressure energy.

[0003] In order to solve the above technical problem, the prior art exists simultaneously driving two compression components to run by using one motor, and the two compression components are distributed on the two sides of the motor, thereby realizing the technical means that two multistage compression components work simultaneously, however, when the compressor works, the pressure of the two compression components cannot always remain the same, at this time, the pressure difference of the two compression components is easy to cause the migration of refrigerant, the migrated refrigerant not only causes the working efficiency of the compression component to reduce, but also affects the working reliability of the motor because of flowing through the motor, finally causes the problems of poor reliability and poor working efficiency of the compressor. SUMMARY

[0004] In order to solve the technical problem that the two compression components in the prior art exist pressure difference and affect working reliability, a compressor and air conditioning unit are provided, which avoids the migration of refrigerant due to the effect of pressure difference by using sealing structure to ensure reliability and working efficiency.

[0005] A compressor comprises:

[0006] A housing;

[0007] A driving mechanism arranged in the housing;

[0008] Two groups of compression components, both groups of compression components are arranged in the housing, and the driving mechanism is arranged between the two groups of compression components, both groups of compression components are connected to the driving mechanism;

[0009] A sealing structure is arranged between each compression component and the driving mechanism.

[0010] The sealing structure comprises a partition plate arranged between the compression assembly and the driving mechanism, and an outer edge of the partition plate is in sealing cooperation with an inner wall of the shell, and a middle part of the partition plate is provided with a through hole for the driving shaft of the driving mechanism to pass through, and a dynamic sealing cooperation is formed between the through hole and the driving shaft.

[0011] The number of the partition plates is at least two, all the partition plates are arranged side by side along the axis direction of the driving shaft, and the partition plates, the compression assembly, adjacent two partition plates and the driving mechanism form isolated cavities.

[0012] The shell is provided with a backflow flow channel, one end of the backflow flow channel is in communication with the isolated cavities, and the other end of the backflow flow channel is in communication with the air inlet of at least one compression assembly.

[0013] The two groups of compression assemblies comprise a first compression assembly and a second compression assembly, the isolated cavity between the first compression assembly and the driving mechanism is a first isolated cavity, the isolated cavity between the second compression assembly and the driving mechanism is a second isolated cavity, the backflow flow channel comprises a first backflow flow channel and a second backflow flow channel, a first end of the first backflow flow channel is in communication with the first isolated cavity, a second end of the first backflow flow channel is in communication with the air inlet of the first compression assembly through a first branch, a second end of the first backflow flow channel is in communication with the air inlet of the second compression assembly through a second branch, a first end of the second backflow flow channel is in communication with the second isolated cavity, a second end of the first backflow flow channel is in communication with the air inlet of the first compression assembly through a third branch, and a second end of the first backflow flow channel is in communication with the air inlet of the second compression assembly through a fourth branch.

[0014] The first branch is provided with a first on-off mechanism, the second branch is provided with a second on-off mechanism, the working states of the first on-off mechanism and the second on-off mechanism are opposite, the third branch is provided with a third on-off mechanism, the fourth branch is provided with a fourth on-off mechanism, and the working states of the third on-off mechanism and the fourth on-off mechanism are opposite.

[0015] The compressor further comprises a control device capable of acquiring the pressure values in the first isolated cavity and the second isolated cavity, and the first on-off mechanism, the second on-off mechanism, the third on-off mechanism and the fourth on-off mechanism are electrically connected with the control device.

[0016] In all the isolation cavities between the compression assemblies and the driving mechanism, all the isolation cavities comprise a primary isolation cavity and at least one secondary isolation cavity, and the primary isolation cavity is located at the side of all the secondary isolation cavities close to the compression assemblies, and the backflow flow channel communicates with any one of the secondary isolation cavities.

[0017] The compressor further comprises a static pressure bearing located between the compression assemblies and the driving mechanism, and a driving shaft of the driving mechanism is arranged on the shell through the static pressure bearing, and the static pressure bearing constitutes the sealing structure.

[0018] The compression assemblies comprise at least two compression structures, all the compression structures are arranged side by side on the driving shaft, and all the compression structures are sequentially communicated, and the driving shaft between adjacent two compression structures is arranged on the shell through a dynamic pressure bearing.

[0019] The compression structure comprises an impeller connected to the driving shaft.

[0020] An air conditioning unit comprising the above compressor.

[0021] The compressor and the air conditioning unit provided by the utility model, by setting the sealing structure between the compression assemblies and the driving mechanism, the sealing structure is used for limiting the migration of the refrigerant of the compression assemblies, so that the exhaust capacity of each compression assembly is ensured and the compression efficiency is ensured, meanwhile, the refrigerant cannot flow to the driving mechanism through the migration of the leakage, the refrigerant used for cooling the driving mechanism cannot flow along the migrated refrigerant, the problem that the high-temperature and high-pressure refrigerant of the compression assemblies impacts the driving mechanism and causes the demagnetization of the magnetic steel in the driving mechanism is avoided, the working reliability of the driving mechanism is ensured, the risk of the heating demagnetization of the driving mechanism is reduced, and the service life of the driving mechanism is prolonged, so that the purpose of improving the reliability and the working efficiency of the compressor is achieved. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 The structure schematic view of the compressor provided by the utility model embodiment;

[0023] In the drawings:

[0024] 1, shell; 2, driving mechanism; 3, compression assembly; 4, partition plate; 31, first compression assembly; 32, second compression assembly; 51, first backflow flow channel; 52, second backflow flow channel; 61, first on-off mechanism; 62, second on-off mechanism; 63, third on-off mechanism; 64, fourth on-off mechanism; 41, primary isolation cavity; 42, secondary isolation cavity; 7, static pressure bearing. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical scheme and advantages of the utility model clearer and more apparent, the utility model will be further described in detail below in combination with the drawings and examples. It should be understood that the specific examples described herein are only used to explain the utility model and are not used to limit the utility model.

[0026] In order to make the person skilled in the art better understand the utility model scheme, the technical scheme in the utility model example will be described clearly and completely below in combination with the drawings in the utility model example. Obviously, the described examples are only a part of the examples of the utility model, rather than all the examples. Based on the examples in the utility model, all other examples obtained by the person skilled in the art without creative labor should belong to the protection scope of the utility model.

[0027] It should be noted that the terms "first", "second" and the like in the description of the utility model and claims and the above-mentioned drawings are used to distinguish similar objects, and do not have to be used to describe a specific order or sequence. It should be understood that the terms used in this way can be interchanged under appropriate circumstances, so that the embodiments of the utility model described herein. In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion, for example, a process, method, system, product or device including a series of steps or units does not have to be limited to the clearly listed steps or units, but can include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0028] It should be noted that in the description of the utility model, the terms "up", "down", "left", "right", "in", "out" and the like indicate the direction or positional relationship of the terms shown in the drawings, which is only for the convenience of description, and does not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation, so it cannot be understood as a limitation on the utility model. In addition, the terms "first", "second" are only for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0029] In addition, it should also be noted that in the description of the utility model, unless otherwise specified and limited, the terms "mounting", "setting", "connection" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be directly connected, or indirectly connected through an intermediate medium, or it can be the communication between two elements. For the person skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0030] There is a technical means in the prior art that utilizes one motor to simultaneously drive two compression assemblies to operate, and the two compression assemblies are distributed on both sides of the motor, so that the two multi-stage compression assemblies work simultaneously. However, when the compressor is working, the pressures of the two compression assemblies cannot always remain the same, and at this time, the pressure difference of the two compression assemblies is easy to cause the migration of refrigerant. The migrated refrigerant not only causes the working efficiency of the compression assembly to decrease, but also affects the cooling reliability of the motor due to flowing through the motor, ultimately causing the problems of poor reliability and poor working efficiency of the compressor.

[0031] Therefore, the present application provides a compressor as shown in Figure 1 The compressor comprises a shell 1, a driving mechanism 2 arranged in the shell 1, two groups of compression assemblies 3, both of which are arranged in the shell 1, and the driving mechanism 2 is arranged between the two groups of compression assemblies 3, and both of the two groups of compression assemblies 3 are connected to the driving mechanism 2, and a sealing structure is arranged between each compression assembly 3 and the driving mechanism 2. By arranging the sealing structure between the compression assembly 3 and the driving mechanism 2, the sealing structure is used to limit the migration of the refrigerant of the compression assembly 3, so as to ensure the exhaust capacity of each compression assembly 3 and ensure the compression efficiency. At the same time, the refrigerant cannot flow to the driving mechanism 2 through the leakage migration mode, avoiding the refrigerant used to cool the driving mechanism 2 from flowing with the migrated refrigerant, so as to ensure the cooling effect of the driving mechanism 2, reduce the risk of heat generation and demagnetization of the driving mechanism 2, and prolong the service life of the driving mechanism 2, thereby achieving the purpose of improving the reliability and working efficiency of the compressor.

[0032] As an implementation manner, the sealing structure comprises a partition plate 4 arranged between the compression assembly 3 and the driving mechanism 2, and the outer edge of the partition plate 4 is in sealing cooperation with the inner wall of the shell 1, and the middle part of the partition plate 4 is provided with a through hole for the driving shaft of the driving mechanism 2 to pass through, and the through hole and the driving shaft form a dynamic sealing cooperation. The partition plate 4 is used to separate the compression assembly 3 and the driving mechanism 2. Even if there is refrigerant leakage to the driving mechanism 2, the refrigerant cannot continue to flow to the driving mechanism 2 due to the presence of the partition plate 4, thereby avoiding the migration of the refrigerant, ensuring the exhaust capacity of each compression assembly 3 and ensuring the compression efficiency, prolonging the service life of the driving mechanism 2, and achieving the purpose of improving the reliability and working efficiency of the compressor.

[0033] Further, the number of the partitions 4 is at least two, all the partitions 4 are arranged in parallel along the axis direction of the driving shaft, and the partitions 4, the compression assemblies 3, the adjacent two partitions 4, and the partitions 4 and the driving mechanism 2 form isolation chambers, the multi-stage isolation is performed by using the plurality of partitions 4, the sealing effect of the sealing structure is improved, and the refrigerant can be gathered and stored in the isolation chamber to have a certain pressure in the isolation chamber, the migration of the refrigerant is further inhibited, and the reliability and working efficiency of the compressor are improved.

[0034] The housing 1 is provided with a backflow flow channel, one end of the backflow flow channel is communicated with the isolation chamber, and the other end of the backflow flow channel is communicated with the gas inlet of at least one compression assembly 3. The refrigerant in the isolation chamber is stored, in order to avoid the refrigerant from being accumulated in the isolation chamber to affect the amount of circulating refrigerant, the backflow flow channel is used to guide the refrigerant in the isolation chamber to the gas inlet of the compression assembly 3, so that the refrigerant participates in the circulation again, and the working efficiency of the compressor is ensured.

[0035] Specifically, the two groups of compression assemblies 3 include a first compression assembly 31 and a second compression assembly 32, the isolation chamber between the first compression assembly 31 and the driving mechanism 2 is a first isolation chamber, the isolation chamber between the second compression assembly 32 and the driving mechanism 2 is a second isolation chamber, the backflow flow channel includes a first backflow flow channel 51 and a second backflow flow channel 52, a first end of the first backflow flow channel 51 is communicated with the first isolation chamber, a second end of the first backflow flow channel 51 is communicated with the gas inlet of the first compression assembly 31 through a first branch, the second end of the first backflow flow channel 51 is communicated with the gas inlet of the second compression assembly 32 through a second branch, a first end of the second backflow flow channel 52 is communicated with the second isolation chamber, the second end of the first backflow flow channel 51 is communicated with the gas inlet of the first compression assembly 31 through a third branch, and the second end of the first backflow flow channel 51 is communicated with the gas inlet of the second compression assembly 32 through a fourth branch. The backflow direction of the refrigerant in the first isolation chamber is controlled by using the first branch and the second branch, when the first branch is communicated, the refrigerant leaked from the first compression assembly 31 can flow back to the first compression assembly 31, the compression efficiency of the first compression assembly 31 is improved, and since the refrigerant in the first isolation chamber is the refrigerant migrated from the first compression assembly 31 to the second compression assembly 32, it indicates that the pressure value of the first compression assembly 31 is greater than that of the second compression assembly 32 at this time, in order to balance the exhaust pressure of the first compression assembly 31 and the second compression assembly 32, the refrigerant that can be migrated is guided to the second compression assembly 32 by using the second branch, the refrigerant is prevented from flowing through the driving mechanism 2, the working reliability of the driving mechanism 2 is ensured, and the working reliability of the compressor is further ensured.

[0036] The first branch is provided with a first on-off mechanism 61, the second branch is provided with a second on-off mechanism 62, the working states of the first on-off mechanism 61 and the second on-off mechanism 62 are opposite, that is, the refrigerant in the first isolation cavity can only be delivered to one compression assembly 3 at the same time, avoiding the influence of the working reliability of the compressor caused by the communication of the two compression assemblies 3 through the first isolation cavity. The third branch is provided with a third on-off mechanism 63, the fourth branch is provided with a fourth on-off mechanism 64, the working states of the third on-off mechanism 63 and the fourth on-off mechanism 64 are opposite, that is, the refrigerant in the second isolation cavity can only be delivered to one compression assembly 3 at the same time, avoiding the influence of the working reliability of the compressor caused by the communication of the two compression assemblies 3 through the second isolation cavity.

[0037] The compressor further comprises a control device, the control device can acquire the pressure values in the first isolation cavity and the second isolation cavity, and the first on-off mechanism 61, the second on-off mechanism 62, the third on-off mechanism 63 and the fourth on-off mechanism 64 are all electrically connected with the control device. By judging the pressure values in the first isolation cavity and the second isolation cavity, calculating the real-time pressure ratio, then comparing the real-time pressure ratio with the preset pressure ratio, and controlling the first on-off mechanism 61, the second on-off mechanism 62, the third on-off mechanism 63 and the fourth on-off mechanism 64 according to the comparison result, the migrated refrigerant generated by the two compression assemblies 3 is controlled to flow back to the flow path of the refrigerant circulation, and finally the exhaust pressures of the two compression assemblies 3 are made as same as possible, so as to ensure the working effect of the compressor.

[0038] For example, the preset pressure ratio is 5%, when it is detected that the real-time pressure ratio is less than 5%, it indicates that the exhaust pressures of the two compression assemblies 3 are relatively small at this time, which will not affect the final exhaust pressure of the compressor, then the first on-off mechanism 61 and the fourth on-off mechanism 64 are controlled to be opened, at this time, the refrigerant in the first isolation cavity flows back to the first compression assembly 31, and the refrigerant in the second isolation cavity flows back to the second compression assembly 32, at this time, the compression processes of the first compression assembly 31 and the second compression assembly 32 are separately ensured to work normally. When it is detected that the real-time pressure ratio is greater than or equal to 5%, it indicates that the exhaust pressures of the two compression assemblies 3 are relatively large at this time, the exhaust mixture of the two compression assemblies 3 will cause the pulsation of the exhaust pressure of the compressor, therefore, the second on-off mechanism 62 and the third on-off mechanism 63 are controlled to be opened, at this time, the refrigerant in the first isolation cavity flows back to the second compression assembly 32, and the refrigerant in the second isolation cavity flows back to the first compression assembly 31, so as to use the migrated refrigerant to correspondingly compensate the two compression assemblies 3, thereby balancing the exhaust pressures of the two compression assemblies 3, and finally ensuring the stability of the exhaust pressure of the compressor.

[0039] In all the isolation cavities between the compression assembly 3 and the driving mechanism 2, all the isolation cavities include a first-level isolation cavity 41 and at least one second-level isolation cavity 42, and the first-level isolation cavity 41 is located on the side of all the second-level isolation cavities 42 close to the compression assembly 3, and the backflow flow channel communicates with any one of the second-level isolation cavities 42. That is, the isolation cavity formed by the partition plate 4 close to the compression assembly 3 and the compression assembly 3 is the first-level isolation cavity 41, and the isolation cavities between the partition plates 4 and the isolation cavities formed by the partition plate 4 and the driving mechanism 2 are the second-level isolation cavities 42. Since the compression assembly 3 compresses the refrigerant during operation and needs to send a certain amount of lubricating oil for lubrication, part of the lubricating oil will exist in the first-level isolation cavity 41. When the part of the lubricating oil backflows to the suction port of the compression assembly 3, it will affect the working reliability and efficiency of the compression assembly 3. However, due to the isolation effect of the partition plate 4, the amount of lubricating oil in the second-level isolation cavity 42 is small, so backflowing the refrigerant from the second-level isolation cavity 42 can effectively reduce the amount of backflowing lubricating oil, thereby ensuring the working reliability of the compression assembly 3.

[0040] Moreover, since one driving mechanism 2 needs to drive two groups of compression assemblies 3 to operate and work at the same time, the heat generation of the driving mechanism 2 is very high. The partition plates 4 located on both sides of the driving mechanism 2 can isolate the driving mechanism 2, avoid the high-temperature and high-pressure refrigerant of the compression assembly 3 from affecting the reliability of the driving mechanism 2, and avoid the refrigerant used to cool the driving mechanism 2 from flowing to the compression assembly 3, so that the driving mechanism 2 can be fully cooled, the risk of heat generation demagnetization of the driving mechanism 2 is reduced, and the service life of the driving mechanism 2 is prolonged, thereby achieving the purpose of improving the reliability and working efficiency of the compressor. Preferably, the driving mechanism 2 is a motor, and the partition plates 4 located on both sides of the motor can isolate the motor, avoid the high-temperature and high-pressure refrigerant of the compression assembly 3 from impacting the internal magnetic steel of the motor to avoid demagnetization of the magnetic steel, and avoid the refrigerant used to cool the motor from flowing to the compression assembly 3, so that the motor can be fully cooled, the risk of heat generation demagnetization of the motor is reduced, and the service life of the motor is prolonged.

[0041] The compression assembly 3 includes at least two compression structures, all the compression structures are arranged side by side on the driving shaft, and all the compression structures are sequentially communicated, and the driving shaft between adjacent two compression structures is arranged on the housing 1 through a dynamic pressure bearing. Since the compression assembly 3 needs to be compressed in multiple stages, the size of the compression assembly 3 in the axial direction of the driving shaft is arranged with multiple compression structures for sequential compression, which will increase the degree of the driving shaft. In order to ensure the reliability of the driving shaft, the driving shaft needs to be supported. Therefore, a dynamic pressure bearing is arranged between the compression structures for support. The dynamic pressure bearing can form a reliable gas film for support as the rotating speed of the driving shaft increases, and does not need to be supplied with external gas, thereby also achieving reliable support of the driving shaft and ensuring the bearing capacity of the driving shaft.

[0042] The compression structure comprises an impeller connected to the drive shaft, and the impeller is driven to rotate by the drive shaft, and a compression flow channel for the rotation of the impeller is formed on the shell 1, and the rotation of the impeller can force the refrigerant to flow and compress, thereby achieving the compression purpose of the compression structure.

[0043] The compressor further comprises a static pressure bearing 7 located between the compression assembly 3 and the drive mechanism 2, and the drive shaft of the drive mechanism 2 is arranged on the shell 1 through the static pressure bearing 7, and the static pressure bearing 7 constitutes the sealing structure. The static pressure bearing 7 can obtain high-pressure refrigerant from the outside to support the drive shaft, and the high-pressure refrigerant can inhibit the leakage and migration of the refrigerant in the compression assembly 3, thereby achieving the purpose of improving the reliability and working efficiency of the compressor.

[0044] The compression assembly 3 comprises at least two compression structures, all of which are arranged side by side on the drive shaft, and all of which are sequentially communicated, and the drive shaft between adjacent two compression structures is arranged on the shell 1 through a dynamic pressure bearing. Since the compression assembly 3 needs to be compressed in multiple stages, the size of the compression assembly 3 in the axial direction of the drive shaft is arranged with multiple compression structures for sequential compression, which can increase the disturbance of the drive shaft. In order to ensure the reliability of the drive shaft, the drive shaft needs to be supported, and therefore a dynamic pressure bearing is arranged between the compression structures for support. The dynamic pressure bearing can form a reliable gas film for support as the rotational speed of the drive shaft increases, and does not need to be supplied with external gas, thereby also achieving reliable support of the drive shaft and ensuring the carrying capacity of the drive shaft.

[0045] The compression structure comprises an impeller connected to the drive shaft, and the impeller is driven to rotate by the drive shaft, and a compression flow channel for the rotation of the impeller is formed on the shell 1, and the rotation of the impeller can force the refrigerant to flow and compress, thereby achieving the compression purpose of the compression structure.

[0046] An air conditioning unit comprising the above-mentioned compressor.

[0047] The above-mentioned embodiments only express several embodiments of the present application, and the description is relatively specific and detailed, but it cannot be understood as a limitation on the scope of the present application. It should be noted that for ordinary skilled persons in the art, without departing from the concept of the present application, a number of modifications and improvements can be made, which all belong to the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the appended claims.

Claims

1. A compressor characterized by: The utility model provides a kind of compressor, including: Shell (1); Driving mechanism (2), the driving mechanism (2) is arranged in the shell (1); Two groups of compression components (3), two groups of the compression component (3) are arranged in the shell (1), and the driving mechanism (2) is arranged between two groups of the compression component (3), and two groups of the compression component (3) are connected on the driving mechanism (2); Sealing structure, sealing structure is provided between each the compression component (3) and the driving mechanism (2).

2. The compressor of claim 1, wherein: The sealing structure includes partition (4), the partition (4) is arranged between the compression component (3) and the driving mechanism (2), and the outer edge of the partition (4) is sealed with the inner wall of the shell (1), the middle part of the partition (4) is provided with the through hole for the driving shaft of driving mechanism (2) to pass through, and the through hole is formed with dynamic sealing cooperation between the driving shaft.

3. The compressor of claim 2, wherein: The number of the partition (4) is at least two, all the partition (4) is arranged in parallel along the axis direction of the driving shaft, and the partition (4) is between the compression component (3), between two adjacent partition (4) and between the partition (4) and the driving mechanism (2) forms isolated cavity.

4. The compressor of claim 3, wherein: The shell (1) is provided with backflow flow channel, one end of the backflow flow channel is communicated with the isolated cavity, and the other end of the backflow flow channel is communicated with the air inlet of at least one compression component (3).

5. The compressor of claim 4, wherein: Two groups of the compression component (3) include first compression component (31) and second compression component (32), the isolated cavity between the first compression component (31) and the driving mechanism (2) is first isolated cavity, the isolated cavity between the second compression component (32) and the driving mechanism (2) is second isolated cavity, the backflow flow channel includes first backflow flow channel (51) and second backflow flow channel (52), the first end of the first backflow flow channel (51) is communicated with the first isolated cavity, the second end of the first backflow flow channel (51) is communicated with the air inlet of the first compression component (31) by first branch, the second end of the first backflow flow channel (51) is communicated with the air inlet of the second compression component (32) by second branch, the first end of the second backflow flow channel (52) is communicated with the second isolated cavity, the second end of the first backflow flow channel (51) is communicated with the air inlet of the first compression component (31) by third branch, and the second end of the first backflow flow channel (51) is communicated with the air inlet of the second compression component (32) by fourth branch.

6. The compressor of claim 5, wherein: The first branch is provided with first on-off mechanism (61), the second branch is provided with second on-off mechanism (62), the working state of first on-off mechanism (61) and second on-off mechanism (62) is opposite, the third branch is provided with third on-off mechanism (63), the fourth branch is provided with fourth on-off mechanism (64), and the working state of third on-off mechanism (63) and fourth on-off mechanism (64) is opposite.

7. The compressor of claim 6, wherein: The compressor further comprises a control device capable of acquiring the pressure values in the first and second isolated cavities, and the first, second, third and fourth on-off mechanisms are electrically connected to the control device.

8. The compressor of claim 4, wherein: In all the isolated cavities between the compression assemblies (3) and the driving mechanism (2), all the isolated cavities comprise a primary isolated cavity (41) and at least one secondary isolated cavity (42), and the primary isolated cavity (41) is located on the side of all the secondary isolated cavities (42) close to the compression assemblies (3), and the backflow channel communicates with any one of the secondary isolated cavities (42).

9. The compressor of claim 1, wherein: The compressor further comprises a hydrostatic bearing (7) located between the compression assemblies (3) and the driving mechanism (2), and the driving shaft of the driving mechanism (2) is arranged on the shell (1) through the hydrostatic bearing (7), and the hydrostatic bearing (7) constitutes the sealing structure.

10. The compressor of claim 9, wherein: The compression assemblies (3) comprise at least two compression structures, all the compression structures are arranged side by side on the driving shaft, and all the compression structures are sequentially communicated, and the driving shaft between adjacent two compression structures is arranged on the shell (1) through a dynamic pressure bearing.

11. The compressor of claim 10, wherein: The compression structure comprises an impeller connected to the driving shaft.

12. An air conditioning unit characterized by: The compressor comprises any one of claims 1 to 11. The compressor comprises any one of claims 1 to 11.

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