Air suspension compressor

Abstract

The present invention relates to the field of compressor technology, and specifically provides an air suspension compressor, which aims to solve the problem of poor reliability of air suspension compressors. To this end, the air suspension compressor of the present invention includes: a casing, which is provided with an exhaust port and a working chamber formed inside; a main shaft is rotatably arranged in the working chamber, and the interior is hollow to form an air supply chamber, and an air supply hole and a radial suspension hole group are provided on the main shaft along its own axial direction; an impeller assembly is arranged on the main shaft, including a first impeller and a second impeller arranged coaxially; an exhaust pipe is provided in the working chamber, and the two ends are respectively connected to the exhaust port and the second air outlet of the second impeller; the air supply assembly includes an air supply impeller and a diversion branch, the air supply impeller guides part of the gas in the exhaust pipe to the diversion branch, and provides high-pressure supply gas to the air supply chamber through the air supply hole, and the air supply gas is ejected through the radial suspension hole group. The present application can improve the stability of the air film and enhance the operational reliability of the air suspension compressor.

Description

Technical Field

[0001] The present invention relates to the technical field of compressors, and in particular provides an air suspension compressor. Background Art

[0002] Currently, centrifugal compressors are the core components of large refrigeration and air-conditioning units. They achieve gas compression by generating centrifugal force through the high-speed rotation of the impeller. Among them, the air suspension bearings used in oil-free centrifugal compressors are mainly divided into dynamic pressure air suspension bearings and static pressure air suspension bearings. Dynamic pressure air suspension bearings rely on the high-speed rotation of the shaft neck to drive the gas into the converging wedge space to generate a high-pressure air film to provide bearing capacity for the shaft neck. However, the gas viscosity is low, and extremely high speeds are required to provide sufficient bearing capacity, which limits its application in medium and small centrifugal compressors. Static pressure air suspension bearings provide bearing capacity by introducing high-pressure gas into a small gap to generate a pressure air film. The external high-pressure gas is squeezed in the extremely small gap, resulting in a pressure difference between the upper and lower sides of the shaft neck, which puts the shaft neck in a suspended state. It has the advantages of no friction, low power consumption, and no takeoff speed requirements, making it more suitable for small and medium-sized centrifugal compressors.

[0003] In prior art air-levitated compressors, the main shaft support of a statically air-levitated system requires a continuous external air supply. However, this arrangement requires a large number of components for the air supply system, which not only takes up a large amount of space but also renders the air supply system inoperable if any component fails, resulting in poor reliability and stability. To address the issues of large space requirements and poor stability associated with the air supply system, a related art solution proposes an air-levitated compressor in which a stator and rotor are disposed within a mounting cavity within a motor housing, with two impellers disposed at either end of the rotor. An air bearing assembly is also disposed within the mounting cavity, with a gap between the rotor and the stator. The air-levitated compressor also includes an air outlet mechanism having a ventilation cavity within which two impellers are disposed. The air outlet mechanism generates gas within the ventilation cavity at a higher pressure than that within the mounting cavity. Consequently, some gas leaks through the mounting gap between the two impellers into the mounting cavity and into the gap between the air bearing assembly and the rotor, forming a refrigerant gas layer as the rotor rotates, thereby achieving the air bearing function. However, since the amount of gas leakage is unstable, the stability of the resulting air film cannot be guaranteed. Summary of the Invention

[0004] The present invention aims to solve the above technical problem, that is, to solve the problem of poor stability of air suspension compressors.

[0005] The present invention provides an air suspension compressor, comprising: a casing, a working chamber is formed inside, and an exhaust port is provided on the casing; a main shaft is rotatably arranged in the working chamber, the main shaft is arranged to be hollow inside to form an air supply chamber, and an air supply hole and a radial suspension hole group are provided on the main shaft along its own axial direction; an impeller assembly is arranged on the main shaft, the impeller assembly includes at least a first impeller and a second impeller arranged coaxially, the first impeller and the second impeller are configured to compress a gas-phase refrigerant to form a high-pressure gas; an exhaust pipe is at least partially arranged on the working chamber In the working cavity, the two ends of the exhaust pipe are respectively connected with the exhaust port and the air outlet of the second impeller; the air supply component at least includes an air supply impeller and a branch pipe arranged on the main shaft, the two ends of the branch pipe are respectively connected with the exhaust pipe and the air supply impeller, and the air supply impeller is configured to be able to divert part of the high-pressure gas of the exhaust pipe to the branch pipe when rotating, and provide high-pressure supply gas to the air supply cavity through the air supply hole, so that the supply gas is ejected through the radial suspension hole group to form an air film around the main shaft.

[0006] When the above technical solution is adopted, the first and second impellers can compress the gaseous refrigerant entering the casing as the main shaft rotates to form a high-pressure gaseous refrigerant, which is then discharged from the casing through the exhaust duct. By arranging an air supply impeller on the main shaft that is coaxial with the first and second impellers, a portion of the high-pressure gas in the exhaust duct can be diverted to the air supply impeller and compressed again. Furthermore, high-pressure gas is delivered to the air supply cavity through the air supply holes provided on the main shaft. After the high-pressure gas is stabilized in the air supply cavity, it is ejected through the radial suspension hole group to form an air film around the main shaft, thereby providing support for the main shaft. In this way, the air supply cavity formed by the hollow main shaft realizes the function of an external air supply tank. After the high-pressure gas enters the air supply cavity and is stabilized, it is ejected through the radial suspension hole group to form a stable air film layer around the main shaft. The air film has better stability, thereby improving the reliability of the air suspension compressor.

[0007] In an optional embodiment of the above-mentioned air-suspended compressor, the air supply component also includes: a thrust plate, which is arranged on the main shaft and located between the first impeller and the second impeller, and the thrust plate is arranged to be hollow inside to form a ventilation cavity, and the ventilation cavity is connected to the air supply cavity; wherein, a plurality of axial suspension holes are provided on the two oppositely arranged disk surfaces of the thrust plate, and the axial suspension holes are arranged to allow the supply gas to be ejected to form an air film around the thrust plate.

[0008] By cooperating with the thrust plate and the axial suspension hole arranged on the disk surface of the thrust plate, an air film support is formed around the thrust plate and around the main shaft, which can always ensure the axial stability of the main shaft and avoid axial movement, thereby improving the stability of the air suspension compressor.

[0009] In an optional embodiment of the above-mentioned air-suspended compressor, the air supply component also includes: an air supply diffuser, arranged at the air outlet of the air supply impeller, and configured to increase the static pressure of the gas flowing through the air supply impeller; and an air supply pipe, connected between the air supply diffuser and the air supply hole.

[0010] By setting up the air supply diffuser, the static pressure of the high-pressure gas that has been compressed again after passing through the air supply impeller can be increased. The high-pressure gas after the static pressure is increased enters the air supply cavity through the air supply pipe and the air supply hole. After the pressure is expanded and stabilized in the air supply cavity, these gases are ejected through the radial suspension hole group and the axial suspension hole to form a stable air film around the main shaft.

[0011] In an optional embodiment of the above-mentioned air-suspended compressor, an air flow channel surrounding the main shaft and the thrust plate is formed inside the casing, and the air film is distributed in the air flow channel; the air supply component also includes: a return air pipe, the return air pipe includes a plurality of air inlet ends arranged in parallel, the air inlet ends are all connected to the air flow channel, and the exhaust end of the return air pipe is connected to the condensation inlet of the condenser.

[0012] By setting up the return air pipe, the decompressed gas can be discharged to maintain the balance of air film pressure around the main shaft and thrust plate, thereby ensuring stable rotation of the main shaft; at the same time, it can also take away the heat generated by the rotation of the main shaft.

[0013] In an optional embodiment of the above-mentioned air suspension compressor, it further includes: a first sealing member, which is arranged at the air supply inlet of the air supply impeller; and a second sealing member, which is arranged on the main shaft and located at the connection between the main shaft and the air supply pipe.

[0014] The first and second seals prevent leakage of high-pressure gas within the air supply assembly, maintaining the pressure and dynamic balance of the air film and thus ensuring the stability of the air film. Furthermore, the first seal prevents external dust, moisture, or oil mist from entering the air supply cavity or mixing with the air film, thus preventing contamination of the air film.

[0015] In an optional embodiment of the above-mentioned air suspension compressor, the radial suspension hole group includes multiple groups of radial suspension sub-hole groups arranged at intervals along the axial direction of the main shaft; each group of the radial suspension sub-hole group includes multiple radial suspension holes arranged at intervals along the circumferential direction of the main shaft.

[0016] Such an arrangement can form a uniform and stable air film around the main shaft to maintain the balance of the main shaft, thereby ensuring the stable operation of the air suspension compressor.

[0017] In an optional embodiment of the above-mentioned air suspension compressor, it also includes: a rotor winding, which is fixedly arranged on the main shaft and located between the first impeller and the second impeller; wherein, at least two groups of radial suspension hole groups are provided on the main shaft, and the two groups of radial suspension hole groups are respectively located at both ends of the rotor winding; and a stator winding, which is fixedly arranged in the working chamber.

[0018] The rotation of the main shaft can be achieved through the cooperation of the rotor winding and the stator winding; further, the air-floating support of the main shaft can be guaranteed by cooperating with the radial suspension hole group; by providing radial suspension hole groups at both ends of the rotor winding on the main shaft, the stability and uniformity of the air film in the axial direction can be guaranteed.

[0019] In an optional embodiment of the above-mentioned air-suspended compressor, the impeller assembly also includes: an air inlet channel, formed in the casing and connected between the air inlet of the first impeller and the air inlet of the casing; a first volute, formed in the working chamber, including a first volute air inlet and a first volute air outlet, the first volute air inlet is connected to the first air outlet of the first impeller; a first diffuser, arranged between the first volute air inlet and the first air outlet of the first impeller, and is configured to increase the static pressure of the gas flowing through the first impeller.

[0020] The first diffuser can convert the dynamic pressure of the high-pressure gas flowing out of the first air outlet of the first impeller into static pressure; the first volute is used to collect the gas compressed by the first impeller, optimize the airflow path, and reduce turbulence and energy loss.

[0021] In an optional embodiment of the above-mentioned air-suspended compressor, the impeller assembly also includes: a connecting pipeline, connected between the first volute air outlet and the second air inlet of the second impeller; a second volute, formed in the working chamber, including a second volute air inlet and a second volute air outlet, the second volute air inlet is connected to the second air outlet of the second impeller, and the second volute air outlet is connected to the exhaust duct; a second diffuser, arranged between the second volute air inlet and the second air outlet of the second impeller, and is configured to increase the static pressure of the gas flowing through the second impeller.

[0022] The connecting pipeline can smoothly guide the airflow out of the first volute to the second impeller; the dynamic pressure of the high-pressure gas flowing out of the second air outlet of the second impeller can be converted into static pressure through the second diffuser, and the airflow can be smoothly guided to the exhaust pipe and the diversion branch through the second volute.

[0023] In an optional embodiment of the above-mentioned air suspension compressor, it also includes: a third seal, which is arranged at the air inlet of the first impeller and the air inlet of the second impeller; a fourth seal, which is arranged at the connection between the first impeller and the main shaft, and / or, is arranged at the connection between the second impeller and the main shaft.

[0024] By providing the third sealing member and the fourth sealing member, leakage of high-pressure gas in the impeller assembly can be avoided, thereby avoiding affecting the formation of the gas film. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The preferred embodiments of the present invention are described below with reference to the accompanying drawings, in which:

[0026] Figure 1 is a cross-sectional schematic diagram of an air suspension compressor provided by the present invention;

[0027] Figure 2 yes Figure 1 A magnified schematic diagram of part A;

[0028] Figure 3 yes Figure 1 An enlarged schematic diagram of part B;

[0029] Figure 4 It is a cross-sectional schematic diagram of a partial structure of an air suspension compressor provided by the present invention.

[0030] Description of reference numerals:

[0031] 100, housing; 101, air flow channel; 102, air intake channel; 110, exhaust port; 120, air inlet;

[0032] 200, main shaft; 201, air supply cavity; 210, air supply hole; 220, radial suspension hole group; 221, radial suspension hole;

[0033] 310, first impeller; 311, first air inlet; 312, first air outlet; 320, second impeller; 321, second air inlet; 322, second air outlet; 330, exhaust duct; 340, thrust plate; 341, ventilation cavity; 342, axial suspension hole; 350, first volute; 351, first volute air inlet; 352, first volute air outlet; 360, first diffuser; 370, connecting pipeline; 380, second volute; 381, second volute air inlet; 382, ​​second volute air outlet; 390, second diffuser;

[0034] 410, air supply impeller; 411, air supply inlet; 420, branch pipe; 430, air supply diffuser; 440, air supply pipe; 450, air return pipe; 451, air intake end; 452, exhaust end;

[0035] 510, rotor winding; 520, stator winding;

[0036] 610, first sealing member; 620, second sealing member; 630, third sealing member; 640, fourth sealing member. DETAILED DESCRIPTION

[0037] The preferred embodiments of the present application are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are merely used to explain the technical principles of the present application and are not intended to limit the scope of protection of the present application. In the following technical description, for the sake of convenience of explanation, a full understanding of the disclosed embodiments is provided through a plurality of details. However, one or more embodiments can still be implemented without these details. In other cases, to simplify the drawings, well-known structures and devices may be simplified for display.

[0038] It should be noted that, in the description of this application, terms such as "center," "upper," "lower," "vertical," "inner," and "outer" indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings. This is merely for ease of description and does not indicate or imply that the device or element must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, it should not be understood as limiting this application. In addition, the terms "first," "second," "third," and "fourth" are used for descriptive purposes only and should not be understood as indicating or implying relative importance.

[0039] Furthermore, it should be noted that, in the description of this application, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to direct connections, indirect connections through an intermediate medium, or internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on the specific circumstances.

[0040] The present invention provides an air suspension compressor, combined with Figures 1 to 4 As shown, it includes a casing 100, a main shaft 200, an impeller assembly and an air supply assembly.

[0041] A working chamber is formed inside the housing 100 , and an exhaust port 110 is provided on the housing 100 .

[0042] The main shaft 200 is rotatably disposed in the working chamber. The main shaft 200 is configured to be hollow inside to form an air supply chamber 201 . An air supply hole 210 and a radial suspension hole group 220 are provided on the main shaft 200 along its axial direction.

[0043] The impeller assembly is arranged on the main shaft 200, and the impeller assembly includes at least a first impeller 310 and a second impeller 320 arranged coaxially. The first impeller 310 and the second impeller 320 are configured to compress the gas-phase refrigerant to form a high-pressure gas. The impeller assembly has an exhaust pipe 330 connected to the exhaust port 110.

[0044] The exhaust pipe 330 is at least partially disposed in the working chamber, and both ends of the exhaust pipe 330 are respectively connected to the exhaust port 110 and the second air outlet 322 of the second impeller 320 .

[0045] The air supply component includes at least an air supply impeller 410 and a diversion branch 420 arranged on the main shaft 200. The two ends of the diversion branch 420 are respectively connected to the exhaust pipe 330 and the air supply impeller 410. The air supply impeller 410 is configured to be able to divert part of the high-pressure gas in the exhaust pipe 330 to the diversion branch 420 when rotating, and provide high-pressure air supply gas to the air supply cavity 201 through the air supply hole 210. The air supply gas is ejected through the radial suspension hole group 220 to form an air film around the main shaft 200.

[0046] Optionally, the air-suspension compressor is connected to the condenser, throttling component, and evaporator via a refrigerant delivery pipeline, and together they constitute the core components of the air conditioning or refrigeration equipment. A working chamber is formed within the housing 100, and the housing 100 is provided with an exhaust port 110 and an air inlet 120. Low-temperature, low-pressure gas-phase refrigerant flows into the housing 100 through the air inlet 120. The low-temperature, low-pressure gas-phase refrigerant is converted into high-temperature, high-pressure gas-phase refrigerant under the action of the impeller assembly, and the high-temperature, high-pressure gas-phase refrigerant flows out of the air-suspension compressor through the exhaust port 110.

[0047] Furthermore, when the air conditioner or refrigeration equipment is in the cooling state, the high-temperature and high-pressure gas-phase refrigerant discharged from the exhaust port 110 enters the condenser, condenses into a liquid-phase refrigerant in the condenser and releases a large amount of heat to form a high-pressure liquid-phase refrigerant. The high-pressure liquid-phase refrigerant discharged from the condenser is throttled and depressurized by a throttling component, and part of the liquid-phase refrigerant is vaporized. The low-pressure refrigerant mixed with gas and liquid phases enters the evaporator, absorbs heat in the evaporator to form a low-temperature and low-pressure gas-phase refrigerant. The low-temperature and low-pressure gas-phase refrigerant circulates to the air suspension compressor.

[0048] Among them, the impeller assembly includes at least a first impeller 310 and a second impeller 320 arranged on the main shaft 200. Driven by the main shaft 200, the first impeller 310 rotates at a high speed, and uses centrifugal force to throw the gas-phase refrigerant from the center of the first impeller 310 to the edge, so as to achieve preliminary compression of the gas-phase refrigerant and increase the kinetic energy. Further, the refrigerant after preliminary compression enters the second impeller 320, and the second impeller 320 rotates at a high speed, and uses centrifugal force to throw the gas-phase refrigerant from the center of the second impeller 320 to the edge, so as to achieve re-compression of the gas-phase refrigerant and increase the kinetic energy. Further, the high-temperature and high-pressure gas-phase refrigerant formed flows out of the casing 100 through the exhaust port 110. Specifically, the air film is formed between the first impeller 310 and the second impeller 320, and is located on the back side of the first impeller 310 and the back side of the second impeller 320. Furthermore, the front of the first impeller 310's first impeller disk is provided with first blades and faces the air inlet 120, while the back of the first impeller disk faces the second impeller 320. The back of the second impeller 320's second impeller disk faces the first impeller 310, and the front of the second impeller disk is arranged opposite to its back, and is provided with second blades. The back of the first impeller disk is the back side of the first impeller 310, and the back of the second impeller disk is the back side of the second impeller 320.

[0049] Furthermore, the impeller assembly includes an exhaust pipe 330 connected to the exhaust port 110. The high-temperature, high-pressure gaseous refrigerant compressed by the second impeller 320 flows toward the exhaust port 110 through the exhaust pipe 330. By providing a branch pipe 420 on the exhaust pipe 330, a portion of the gaseous refrigerant flowing toward the exhaust port 110 can flow into the branch pipe 420.

[0050] Among them, the main shaft 200 is also provided with an air supply impeller 410. The air supply impeller 410 is coaxially arranged with the first impeller 310, the second impeller 320 and the main shaft 200. The air supply impeller 410, the first impeller 310 and the second impeller 320 rotate synchronously with the main shaft 200, and can guide part of the gas-phase refrigerant flowing to the exhaust port 110 to the branch pipe 420. Furthermore, the air supply impeller 410 can further compress the gas-phase refrigerant in the branch pipe 420, and drive this part of the refrigerant to flow into the air supply cavity 201 through the air supply hole 210 to form an air supply gas. The high-pressure air supply gas flowing into the air supply cavity 201 is stabilized in the air supply cavity 201, and is ejected through the radial suspension hole group 220 to form an air film around the main shaft 200.

[0051] Optionally, the exhaust duct 330 is at least partially disposed within the working chamber. Preferably, the exhaust duct 330 is entirely disposed within the working chamber to reduce occupied space and the structural complexity of the duct. Alternatively, the exhaust duct 330 is partially disposed within the working chamber and partially extends to the exterior of the housing 100.

[0052] Alternatively, the exhaust duct 330 may be a channel formed in the working chamber for air flow.

[0053] Optionally, the ends of the branch pipe 420 are respectively connected to the exhaust duct 330 and the air supply impeller 410. Preferably, the branch pipe 420 is entirely disposed within the working chamber. Alternatively, the branch pipe 420 is partially disposed within the working chamber and partially extends outside the housing 100 to communicate with the exhaust duct 330.

[0054] Alternatively, the branch pipe 420 may be a channel for air flow formed in the working chamber.

[0055] The air supply impeller 410 is disposed at one end where the second impeller 320 is located, so as to reduce space occupation and improve the compactness of the structure.

[0056] The air film can support the main shaft 200 and eliminate mechanical friction and wear when the main shaft 200 rotates, avoiding the performance degradation and life shortening problems of traditional mechanical bearings caused by lubricating oil contamination and wear particles, and can simplify the structure and reduce energy consumption and maintenance costs.

[0057] In this solution, the main shaft 200 is hollow to form an air supply cavity 201, and an air supply hole 210 and a radial suspension hole group 220 are provided on the main shaft 200 to connect to the air supply cavity 201. By cooperating with the air supply impeller 410 and the built-in branch pipe 420, air can be directly taken from the exhaust pipe 330 of the air suspension compressor, without the need for an external air supply tank, and without the need to set up structural components such as pumps and heating devices that cooperate with the air supply tank. This can improve the structural compactness of the air suspension compressor, reduce the number of components, and reduce the failure rate of the air suspension compressor. It has high integration and better stability. At the same time, such an arrangement can ensure that the air supply component has sufficient high-pressure gas, without having to worry about traditional air supply component problems such as refrigerant migration and liquid level control.

[0058] Optionally, a plurality of air supply holes 210 are provided at intervals around the circumference of the main shaft 200 .

[0059] Optionally, the plurality of air supply holes 210 are arranged at equal intervals.

[0060] Alternatively, the intervals between two adjacent air supply holes 210 are not equal.

[0061] Optionally, the diameter of the air supply hole 210 ranges from 5 mm to 25 mm.

[0062] When the above-mentioned technical solution is adopted, the first impeller 310 and the second impeller 320 can compress the gas-phase refrigerant entering the casing 100 as the main shaft 200 rotates to form a high-pressure gas-phase refrigerant, and the gas-phase refrigerant is discharged from the casing 100 through the exhaust pipe 330. By arranging an air supply impeller coaxially with the first impeller and the second impeller on the main shaft, part of the high-pressure gas in the exhaust pipe can be diverted to the air supply impeller 410, and this part of the high-pressure gas can be compressed again. Furthermore, high-pressure gas is transported to the air supply cavity 201 through the air supply hole 210 provided on the main shaft 200. After the high-pressure gas is stabilized in the air supply cavity 201, it is ejected through the radial suspension hole group 220 to form an air film around the main shaft 200, thereby forming support for the main shaft 200. In this way, the air supply cavity 201 formed by the internal hollow main shaft 200 realizes the function of an external air supply tank. After the high-pressure gas enters the air supply cavity for pressure stabilization, the high-pressure gas is ejected through the radial suspension hole group 220 to form a stable air film layer around the main shaft 200. The stability of the air film is better, thereby improving the reliability of the air suspension compressor.

[0063] In the aforementioned optional embodiment of the air-suspended compressor, the air supply assembly further includes a thrust plate 340. The thrust plate 340 is integrally formed with the main shaft 200 and positioned between the first impeller 310 and the second impeller 320. The thrust plate 340 is hollowed out to form a vent cavity 341, which communicates with the air supply cavity 201. The thrust plate 340 has a plurality of axial suspension holes 342 formed on its two opposing surfaces. These holes are configured to allow the supply gas to be ejected, thereby forming an air film around the thrust plate 340.

[0064] Optionally, the thrust disk 340 is arranged on the main shaft 200, and includes two oppositely arranged disk surfaces arranged along the axial direction of the main shaft 200. Since the thrust disk 340 has a ventilation cavity 341 connected to the air supply cavity 201, the supply gas entering the air supply cavity 201 can enter the ventilation cavity 341. The stabilized supply gas is ejected through the axial suspension hole 342 on the disk surface of the thrust disk 340, forming an air film around the thrust disk 340. In this way, the axial force of the main shaft 200 during rotation can be balanced, and the interaction between the disk surface of the thrust disk 340 and the air film formed around it can generate a reaction force in the opposite direction of the axial force, limit the movement in the axial direction, and ensure that the main shaft 200 is always suspended in the set position, thereby achieving the balance of the main shaft 200.

[0065] Optionally, the axial suspension holes 342 are arranged at intervals along the radial direction of the disk surface of the thrust disk 340 and are arranged around the circumference of the thrust disk 340 to form a sufficient air film around the thrust disk 340 .

[0066] Optionally, the distances between adjacent axial suspension holes 342 are equal, so as to form a uniform and stable air film.

[0067] Alternatively, the distances between adjacent axial suspension holes 342 are unequal. Specifically, the axial suspension holes 342 are arranged at unequal intervals in the radial direction of the thrust disk 340 ; and / or the axial suspension holes 342 are arranged at unequal intervals in the circumferential direction of the thrust disk 340 .

[0068] Optionally, the diameter of the axial suspension hole 342 ranges from 1 mm to 10 mm.

[0069] Alternatively, the thrust plate 340 is sleeved on the main shaft 200. Specifically, the thrust plate 340 is fixedly connected to the main shaft 200 by welding or the like.

[0070] By cooperating with the thrust disk 340 and the axial suspension hole 342 provided on the disk surface of the thrust disk 340, an air film support is formed around the thrust disk 340 and around the main shaft 200, which can always ensure the axial stability of the main shaft 200 and avoid axial movement, thereby improving the stability of the air suspension compressor.

[0071] In the aforementioned optional embodiment of the air-suspended compressor, the air supply assembly further includes an air supply diffuser 430 and an air supply pipe 440. The air supply diffuser 430 is disposed at the air outlet of the air supply impeller 410 and is configured to increase the static pressure of the gas flowing through the air supply impeller 410. The air supply pipe 440 communicates between the air supply diffuser 430 and the air supply hole 210.

[0072] Optionally, the air supply diffuser 430 is a vaneless diffuser that converts the kinetic energy of the gaseous refrigerant discharged from the air supply impeller 410 into static pressure energy and optimizes the airflow path to reduce energy loss. Specifically, the air supply diffuser 430 is a vaneless diffuser that reduces airflow velocity and increases airflow pressure through a diffuser-type flow path.

[0073] By setting the air supply diffuser 430, the static pressure of the high-pressure gas that is compressed again after passing through the air supply impeller 410 can be increased. The high-pressure gas after the static pressure is increased enters the air supply cavity 201 through the air supply pipe 440 and the air supply hole 210. After the pressure is expanded and stabilized in the air supply cavity 201, these gases are ejected through the radial suspension hole group 220 and the axial suspension hole 342, thereby forming a stable air film around the main shaft 200.

[0074] In the aforementioned alternative embodiment of the air suspension compressor, an air flow channel 101 is formed within the housing 100, surrounding the main shaft 200 and the thrust plate 340. An air film is distributed within the air flow channel. The air supply assembly also includes an air return pipe 450. The air return pipe 450 includes a plurality of air inlet ports 451 arranged in parallel, each of which is connected to the air flow channel 101. The air discharge port 452 of the air return pipe 450 is connected to the condenser inlet of the condenser.

[0075] Specifically, the arrangement of airflow channel 101 ensures a relatively uniform distribution of the air film, thereby ensuring the rotation of main shaft 200. That is, during operation of the air suspension compressor, the high-pressure gas in the air film is directed through the return air pipe to the condenser inlet of the condenser, thereby forming a continuous airflow circulation around main shaft 200 and, further, a continuous sealing layer around main shaft 200. This dynamic airflow circulation of the air film also removes heat generated by the rotation of main shaft 200.

[0076] Optionally, the air return pipe 450 includes a plurality of air inlet ends 451 arranged in parallel, and the plurality of air inlet ends 451 correspond to different positions of the main shaft 200 and are arranged to avoid the radial suspension hole group 220 .

[0077] By setting up the return air pipe 450, the decompressed gas can be discharged to maintain the balance of the air film pressure around the main shaft 200 and the thrust plate 340, thereby ensuring the stable rotation of the main shaft 200; at the same time, it can also take away the heat generated by the rotation of the main shaft 200.

[0078] Optionally, the exhaust end 452 of the return air pipe 450 is connected to the condensation inlet of the condenser to allow this part of the gas-phase refrigerant to circulate further.

[0079] Alternatively, the exhaust end 452 of the air return pipe 450 is connected to the air inlet 120 of the housing 100 .

[0080] In an alternative embodiment of the air suspension compressor, a first seal 610 and a second seal 620 are further included. The first seal 610 is disposed at the air supply inlet 411 of the air supply impeller 410. The second seal 620 is disposed on the main shaft 200 and located at the connection between the main shaft 200 and the air supply pipe 440.

[0081] Optionally, the first seal 610 and / or the second seal 620 are configured as labyrinth seals. Labyrinth seals form a "maze" through tooth-shaped, groove-shaped, or hole-shaped structures, causing the gas-phase refrigerant to undergo multiple throttling, expansion, and deflection when passing through, thereby reducing the leakage rate.

[0082] Alternatively, the first seal 610 is not provided.

[0083] Alternatively, the second seal 620 is not provided.

[0084] The provision of first seal 610 and second seal 620 prevents leakage of high-pressure gas within the air supply assembly, maintaining the pressure and dynamic balance of the air film, thereby ensuring the stability of the air film. Furthermore, the provision of first seal 610 prevents external dust, moisture, or oil mist from entering the air supply cavity 201 or mixing with the air film, thereby preventing clogging of the air supply holes 210 and / or contamination of the air film, thereby preventing damage to the stability and uniformity of the air film and ensuring the load-bearing capacity of the air film.

[0085] In an optional embodiment of the above-mentioned air suspension compressor, the radial suspension hole group 220 includes multiple radial suspension sub-hole groups arranged at intervals along the axial direction of the main shaft; each radial suspension sub-hole group includes multiple radial suspension holes 221 arranged at intervals along the circumferential direction of the main shaft.

[0086] Optionally, the diameter of the radial suspension hole 221 ranges from 1 mm to 10 mm.

[0087] By setting up a plurality of radial suspension holes 221 arranged at circumferential intervals along the main shaft 200, and forming a plurality of radial suspension sub-hole groups arranged at axial intervals along the main shaft 200, the radial suspension hole group 220 composed of the plurality of radial suspension sub-hole groups can continuously transport an air film to the surrounding area of ​​the main shaft 200 to quickly form an air film and maintain the stability of the rotation of the main shaft 200.

[0088] With such an arrangement, a uniform and stable air film can be formed around the main shaft 200 to maintain the balance of the main shaft 200 , thereby ensuring the stability of the operation of the air suspension compressor.

[0089] In the optional embodiment of the aforementioned air suspension compressor, a rotor winding 510 and a stator winding 520 are further included. The rotor winding 510 is fixedly mounted on the main shaft 200 and located between the first impeller 310 and the second impeller 320. The main shaft 200 is provided with at least two sets of radial suspension holes 220, one at each end of the rotor winding 510. The stator winding 520 is fixedly mounted in the working chamber.

[0090] Optionally, the rotor winding 510 drives the main shaft 200 and the thrust plate 340 to rotate together.

[0091] By cooperating with the rotor winding 510 and the stator winding 520, the rotation of the main shaft 200 can be achieved; further, by cooperating with the radial suspension hole group 220, the air-floating support of the main shaft 200 can be guaranteed; by providing radial suspension hole groups 220 at both ends of the rotor winding 510 on the main shaft 200, the stability and uniformity of the air film in the axial direction can be guaranteed.

[0092] Alternatively, two sets of radial suspension holes 220 are provided at each end of the rotor winding 510 on the main shaft 200. Alternatively, multiple sets of radial suspension holes 220 are provided on the left side of the rotor winding 510 on the main shaft 200, and multiple sets of radial suspension holes 220 are provided on the right side of the rotor winding 510 on the main shaft 200.

[0093] In the aforementioned optional embodiment of the air-suspended compressor, the impeller assembly further includes an air inlet passage 102, a first volute 350, and a first diffuser 360. The air inlet passage 102 is formed in the housing 100 and communicates between the first air inlet 311 of the first impeller 310 and the air inlet 120 of the housing 100. The first volute 350 is formed in the working chamber and includes a first volute air inlet 351 and a first volute air outlet 352. The first volute air inlet 351 communicates with the first air outlet 312 of the first impeller 310. The first diffuser 360 is disposed between the first volute air inlet 351 and the first air outlet 312 of the first impeller 310 and is configured to increase the static pressure of the gas flowing through the first impeller 310.

[0094] Optionally, after compression by the first impeller 310 and static pressure conversion by the first diffuser 360 , the refrigerant pressure is significantly increased, thereby facilitating subsequent compression to provide high-pressure gas and reduce load.

[0095] The first diffuser 360 can convert the dynamic pressure of the high-pressure gas flowing out of the first air outlet 312 of the first impeller 310 into static pressure, and can also guide the gas-phase refrigerant to transition smoothly, reduce turbulence and flow separation, and reduce energy loss; further, the first volute 350 is used to collect the gas compressed by the first impeller 310, optimize the airflow path, and reduce turbulence and energy loss.

[0096] Optionally, the first diffuser 360 is a vaneless diffuser, which reduces the airflow velocity and increases the pressure through a diffusion-type flow passage.

[0097] In the aforementioned optional embodiment of the air-suspended compressor, the impeller assembly further includes a connecting pipe 370, a second volute 380, and a second diffuser 390. The connecting pipe 370 connects between the first volute outlet 352 and the second air inlet 321 of the second impeller 320. The second volute 380 is formed within the working chamber and includes a second volute inlet 381 and a second volute outlet 382. The second volute inlet 381 connects to the second air outlet 322 of the second impeller 320, which in turn connects to the exhaust duct 330. The second diffuser 390 is disposed between the second volute inlet 381 and the second air outlet 322 of the second impeller 320 and is configured to increase the static pressure of the gas flowing through the second impeller 320.

[0098] The connecting pipe 370 smoothly guides the airflow flowing out of the first volute 350 to the second impeller 320; the dynamic pressure of the high-pressure gas flowing out of the second air outlet 322 of the second impeller 320 can be converted into static pressure through the second diffuser 390, and the airflow can be smoothly guided to the exhaust pipe 330 and the diversion branch 420 through the second volute 380.

[0099] Optionally, the second diffuser 390 is a vaneless diffuser, which reduces the airflow velocity and increases the pressure through a diffusion-type flow passage.

[0100] In this solution, the first impeller 310 performs a single-stage compression of the gas-phase refrigerant, while the second impeller 320 performs a two-stage compression of the gas-phase refrigerant. This two-stage compression by the first and second impellers 310 and 320, along with the static pressure conversion by the first and second diffusers 360 and 390, reduces the compression power consumption of the air-suspension compressor and improves compression efficiency.

[0101] In the optional embodiment of the air suspension compressor described above, a third seal 630 and a fourth seal 640 are further included. The third seal 630 is disposed at the first air inlet 311 of the first impeller 310 and the second air inlet 321 of the second impeller 320. The fourth seal 640 is disposed at the connection between the first blade disk of the first impeller 310 and the main shaft 200, and / or at the connection between the second blade disk of the second impeller 320 and the main shaft 200.

[0102] By providing the third seal 630 and the fourth seal 640 , leakage of high-pressure gas in the impeller assembly can be avoided, which not only avoids gas cross-flow but also avoids affecting the formation of the gas film, thereby ensuring the stability of the gas film.

[0103] Optionally, the third seal 630 and / or the fourth seal 640 are configured as labyrinth seals.

[0104] Alternatively, the third seal 630 is not provided.

[0105] Alternatively, the fourth seal 640 is not provided.

[0106] It should be noted that the above preferred embodiments are only used to illustrate the principles of this application and are not intended to limit the scope of protection of this application. Without departing from the principles of this application, those skilled in the art may adjust the above settings so that this application can be applied to more specific application scenarios.

[0107] Those skilled in the art will appreciate that, although some embodiments herein include certain features included in the embodiments but not others, combinations of features from different embodiments are intended to be within the scope of this application and to form different embodiments. For example, in the claims of this application, any of the claimed embodiments may be used in any combination.

[0108] The technical solutions of the present invention have been described so far in conjunction with the preferred embodiments shown in the accompanying drawings. However, it will be readily understood by those skilled in the art that the scope of protection of the present invention is clearly not limited to these specific embodiments. Without departing from the principles of the present invention, those skilled in the art may make equivalent modifications or substitutions to the relevant technical features, and the technical solutions after such modifications or substitutions will fall within the scope of protection of the present invention.

Claims

1. An air suspension compressor, characterized in that: include: A housing (100) is formed with a working chamber therein, and an exhaust port (110) is provided on the housing (100); A main shaft (200) is rotatably disposed in the working chamber, the main shaft (200) is configured to be hollow inside to form an air supply chamber (201), and the main shaft (200) is provided with an air supply hole (210) and a radial suspension hole group (220) along its own axial direction; An impeller assembly is arranged on the main shaft (200), the impeller assembly comprising at least a first impeller (310) and a second impeller (320) arranged coaxially, the first impeller (310) and the second impeller (320) being configured to compress a gas-phase refrigerant to form a high-pressure gas; an exhaust duct (330) at least partially disposed in the working chamber, with both ends of the exhaust duct (330) respectively communicating with the exhaust port (110) and the second air outlet (322) of the second impeller (320); An air supply assembly at least comprises an air supply impeller (410) and a branch pipe (420) arranged on the main shaft (200), wherein both ends of the branch pipe (420) are respectively connected to the exhaust pipe (330) and the air supply impeller (410), and the air supply impeller (410) is configured to guide part of the high-pressure gas in the exhaust pipe (330) to the branch pipe (420) when rotating, and to provide high-pressure supply gas to the air supply cavity (201) through the air supply hole (210), so that the supply gas is ejected through the radial suspension hole group (220) to form an air film around the main shaft (200); An air flow channel (101) surrounding the main shaft (200) is formed inside the housing (100), and the air film is distributed in the air flow channel (101); The air supply assembly further comprises: an air return pipe (450), the air return pipe (450) comprising a plurality of air inlet ends (451) arranged in parallel, the air inlet ends (451) all being connected to the air flow channel (101), and an air discharge end (452) of the air return pipe (450) being connected to a condensation inlet of a condenser.

2. The air suspension compressor according to claim 1, characterized in that: The air supply assembly further comprises: A thrust plate (340) is provided on the main shaft (200) and is located between the first impeller (310) and the second impeller (320); the thrust plate (340) is provided with a hollow interior to form a ventilation cavity (341); the ventilation cavity (341) is connected to the air supply cavity (201); Wherein, a plurality of axial suspension holes (342) are provided on two oppositely arranged disk surfaces of the thrust disk (340), and the axial suspension holes (342) are configured to allow the supply gas to be ejected to form an air film around the thrust disk (340).

3. The air suspension compressor according to claim 2, characterized in that: The air supply assembly further comprises: an air supply diffuser (430), arranged at the air outlet of the air supply impeller (410), and configured to increase the static pressure of the gas flowing through the air supply impeller (410); An air supply pipe (440) is connected between the air supply diffuser (430) and the air supply hole (210).

4. The air suspension compressor according to claim 3, characterized in that: An air flow channel (101) surrounding the thrust disk (340) is also formed inside the housing (100).

5. The air suspension compressor according to claim 3, characterized in that: Also includes: A first sealing member (610) is provided at the air supply inlet (411) of the air supply impeller (410); A second sealing member (620) is provided on the main shaft (200) and is located at the connection between the main shaft (200) and the air supply pipe (440).

6. The air suspension compressor according to claim 1, characterized in that: The radial suspension hole group (220) comprises a plurality of radial suspension sub-hole groups arranged at intervals along the axial direction of the main axis (200); Each group of radial suspension sub-holes comprises a plurality of radial suspension holes (221) arranged at intervals along the circumference of the main axis (200).

7. The air suspension compressor according to claim 6, characterized in that: Also includes: The rotor winding (510) is fixedly arranged on the main shaft (200) and is located between the first impeller (310) and the second impeller (320); wherein at least two groups of radial suspension hole groups (220) are provided on the main shaft (200), and the two groups of radial suspension hole groups (220) are respectively located at two ends of the rotor winding (510); The stator winding (520) is fixedly arranged in the working chamber.

8. The air suspension compressor according to any one of claims 1 to 7, characterized in that: The impeller assembly further comprises: an air inlet channel (102) formed in the housing (100) and communicating between the first air inlet (311) of the first impeller (310) and the air inlet (120) of the housing (100); a first volute (350) formed in the working chamber, comprising a first volute air inlet (351) and a first volute air outlet (352), wherein the first volute air inlet (351) is in communication with the first air outlet (312) of the first impeller (310); The first diffuser (360) is arranged between the first volute air inlet (351) and the first air outlet (312) of the first impeller (310), and is configured to increase the static pressure of the gas flowing through the first impeller (310).

9. The air suspension compressor according to claim 8, characterized in that: The impeller assembly further comprises: a connecting pipe (370) communicating between the first volute air outlet (352) and the second air inlet (321) of the second impeller (320); a second volute (380) formed in the working chamber, comprising a second volute air inlet (381) and a second volute air outlet (382), wherein the second volute air inlet (381) is in communication with the second air outlet (322) of the second impeller (320), and the second volute air outlet (382) is in communication with the exhaust duct (330); The second diffuser (390) is arranged between the second volute air inlet (381) and the second air outlet (322) of the second impeller (320), and is configured to increase the static pressure of the gas flowing through the second impeller (320).

10. The air suspension compressor according to claim 9, characterized in that: Also includes: a third sealing member (630), provided at the first air inlet (311) of the first impeller (310) and the second air inlet (321) of the second impeller (320); A fourth seal (640) is provided at a connection between a first blade disk of the first impeller (310) and the main shaft (200), and / or at a connection between a second blade disk of the second impeller (320) and the main shaft (200).

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