Compressor and air conditioning unit

Abstract

The invention provides a compressor and an air conditioning unit. The compressor comprises a motor cavity, a rotating shaft, a motor, a compression unit, a bearing, an oil supply channel, an oil return cavity, a sealing piece and an air supply channel. The rotating shaft penetrates through the motor cavity. The motor is installed on the rotating shaft and located in the motor cavity. The compression unit is in driving connection with the rotating shaft and configured to compress the gaseous working medium. The rotating shaft is rotatably supported on the bearing. The oil supply channel is configured to supply oil to the bearing. The return oil chamber is configured to receive return oil from the bearing. The sealing element sleeves the periphery of the rotating shaft and is positioned between the bearing and the motor along the axial direction of the rotating shaft, and two axial ends of the sealing element are respectively positioned in the motor cavity and the oil return cavity to separate the motor cavity from the oil return cavity. The air supply channel is configured to introduce a gaseous working medium with the pressure larger than that of the oil return cavity between the sealing piece and the rotating shaft so as to form air seal between the sealing piece and the rotating shaft.

Description

Technical Field

[0001] The present application relates to the technical field of air conditioning, and in particular to a compressor and an air conditioning unit. Background Art

[0002] If the end of the compressor motor is not sealed properly, the lubricating oil used to lubricate or support the bearing will enter the motor cavity and accumulate at the bottom of the motor cavity, resulting in less oil return and insufficient oil supply, causing the compressor to be damaged due to lack of oil. Especially for negative pressure refrigerant centrifuges, due to the low internal system pressure difference, it is more likely to have insufficient sealing effect on the motor end.

[0003] The above statements are only used to provide background information related to the present application and do not necessarily constitute prior art. Summary of the invention

[0004] The purpose of the present application is to provide a compressor and an air conditioning unit, aiming to solve the problem of insufficient sealing effect at the end of the motor of the compressor.

[0005] A first aspect of the present application provides a compressor, comprising:

[0006] Motor cavity;

[0007] A rotating shaft passes through the motor cavity;

[0008] A motor, mounted on the rotating shaft and located in the motor cavity;

[0009] A compression unit, drivingly connected to the rotating shaft and configured to compress a gaseous working medium;

[0010] a bearing, on which the rotating shaft is rotatably supported;

[0011] an oil supply passage configured to supply oil to the bearing;

[0012] an oil return chamber configured to receive return oil from the bearing;

[0013] A seal, which is sleeved on the outer circumference of the rotating shaft and is located between the bearing and the motor along the axial direction of the rotating shaft, and the axial ends of the seal are respectively located in the motor cavity and the oil return cavity to separate the motor cavity and the oil return cavity; and

[0014] The air supply channel is configured to pass the gaseous working medium with a pressure greater than the oil return chamber pressure of the oil return chamber into between the sealing member and the rotating shaft to form an air seal between the sealing member and the rotating shaft.

[0015] In the compressor of some embodiments, along the axial direction of the rotating shaft, the outlet of the air supply passage is located in the middle of the sealing member.

[0016] In some embodiments of the compressor, the compressor further includes a bearing support and a motor housing for mounting the bearing, and the air supply channel includes:

[0017] A motor housing channel section is arranged in the motor housing;

[0018] a bearing support channel section disposed in the bearing support; and

[0019] The sealing member channel section is arranged in the sealing member.

[0020] In the compressor of some embodiments, the air supply channel includes a large diameter section and a small diameter section whose aperture is smaller than that of the large diameter section, which are sequentially arranged along the flow direction of the gaseous working medium, and the outlet of the small diameter section is the outlet of the air supply channel.

[0021] In the compressor of some embodiments, the aperture of the small diameter section is 1 / 3 to 2 / 3 of the aperture of the large diameter section.

[0022] In the compressor of some embodiments, the aperture of the small diameter section is 1 / 2 of the aperture of the large diameter section.

[0023] In some embodiments of the compressor, the compressor further includes a regulating valve configured to adjust the flow rate of the gaseous working medium in the gas supply passage.

[0024] In some embodiments of the compressor, the compressor further includes a detection device, wherein the detection device is configured to detect a state parameter of a substance in the compressor, and the regulating valve is configured to adjust the flow rate of the gaseous working medium in the air supply channel according to the state parameter.

[0025] In the compressor of some embodiments, the detection device comprises:

[0026] A first pressure sensor is configured to detect the motor cavity pressure, wherein the state parameter includes the motor cavity pressure; and / or

[0027] A second pressure sensor is configured to detect the oil return chamber pressure, wherein the state parameter includes the oil return chamber pressure; and / or

[0028] a temperature sensor configured to detect the oil temperature of the oil in the oil return chamber, wherein the state parameter includes the oil temperature; and / or

[0029] The liquid level sensor is configured to detect the oil level of the oil in the oil return chamber, and the state parameter includes the oil level.

[0030] In the compressor of some embodiments, during the operation of the compressor, the regulating valve is configured to be in an open state, and wherein,

[0031] The regulating valve is configured to reduce the opening when the difference between the motor chamber pressure and the oil return chamber pressure is greater than or equal to a first preset pressure difference, and increase the opening when it is less than or equal to a second preset pressure difference, and the second preset pressure difference is less than the first preset pressure difference; and / or

[0032] The regulating valve is configured to reduce its opening when the motor chamber pressure is greater than or equal to a preset pressure; and / or

[0033] The regulating valve is configured to reduce its opening when the oil temperature is greater than or equal to a first preset temperature; and / or

[0034] The regulating valve is configured to increase the opening when the oil level is greater than or equal to a first preset level, and to decrease the opening when the oil level is less than or equal to a second preset level, wherein the second preset level is lower than the first preset level.

[0035] In some embodiments of the compressor, the compressor also includes a control device connected to the detection device and the regulating valve signal, and the control device is configured to control the action of the regulating valve according to the state parameter detected by the detection device to adjust the flow rate of the gaseous working medium in the air supply channel.

[0036] A second aspect of the present application provides an air-conditioning unit, comprising the compressor described in the first aspect of the present application.

[0037] In some embodiments of the air-conditioning unit, the refrigerant circulation loop of the air-conditioning unit includes a compressor, a condenser, a throttling device and an evaporator connected by a refrigerant pipeline, and is characterized in that the gaseous working medium is a negative pressure refrigerant, and the air supply channel of the compressor receives the high-temperature and high-pressure refrigerant gas in the refrigerant pipeline from the refrigerant circulation loop to form an air seal between the seal and the rotating shaft.

[0038] Based on the compressor provided by the present application, since an oil supply channel is provided, the air supply channel is configured to pass the gaseous working medium whose pressure is greater than the oil return chamber pressure of the oil return chamber into between the seal and the rotating shaft so as to form an air seal between the seal and the rotating shaft, which is beneficial to increase the air seal pressure, prevent lubricating oil from entering the motor cavity, improve the oil return efficiency, and reduce the risk of compressor shaft seizure damage.

[0039] The air conditioning unit provided by the present application has the advantages of the compressor of the present application.

[0040] Other features and advantages of the present application will become apparent from the following detailed description of exemplary embodiments of the present application with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0042] Figure 1 This is a schematic diagram of the cross-sectional structure of a compressor according to an embodiment of the present application at one angle.

[0043] Figure 2 It is a schematic diagram of the partial cross-sectional structure of the compressor of the embodiment from another angle.

[0044] Figure 3 This is a schematic diagram of the control principle of the regulating valve according to an embodiment of the present application.

[0045] Figures 1 to 3 In the figure, each reference numeral represents:

[0046] 1. Front bearing support;

[0047] 2. Front bearing;

[0048] 3. Front seal;

[0049] 4. Motor;

[0050] 5. Motor housing;

[0051] 6. Rear seal;

[0052] 7. Rear bearing;

[0053] 8. Rear bearing support;

[0054] 9. Fuel tank;

[0055] 10. Rotating shaft;

[0056] 11. Oil supply channel;

[0057] 12. Oil supply pipe;

[0058] 13. Oil return pipe;

[0059] 14. air supply channel; 141. motor housing channel section; 142. bearing support channel section; 143. sealing channel section;

[0060] 15. Regulating valve;

[0061] 16. Air supply pipe;

[0062] 20. Detection device; 201. First pressure sensor; 202. Second pressure sensor; 203. Temperature sensor; 204. Liquid level sensor;

[0063] 30. Control device;

[0064] C1, motor cavity;

[0065] C2, oil return chamber. DETAILED DESCRIPTION

[0066] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means intended to limit the present application and its application or use. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0067] Unless otherwise specifically stated, the relative arrangement, numerical expressions and numerical values ​​of the parts and steps set forth in these embodiments do not limit the scope of the present application. Meanwhile, it should be understood that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to actual proportional relationships. The technology, methods and equipment known to those of ordinary skill in the relevant art may not be discussed in detail, but in appropriate cases, the technology, methods and equipment should be considered as a part of the specification. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters represent similar items in the following drawings, and therefore, once a certain item is defined in an accompanying drawing, it does not need to be further discussed in subsequent drawings.

[0068] In the description of the present application, it should be understood that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of the present application.

[0069] In the description of the present application, it should be understood that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction, and therefore cannot be understood as limiting the scope of protection of the present application; the directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.

[0070] In addition, the technical features involved in the different embodiments of the present application described below can be combined with each other as long as they do not conflict with each other.

[0071] like Figure 1 to Figure 2 As shown, an embodiment of the present application provides a compressor. The compressor includes a motor cavity C1, a rotating shaft 10, a motor 4, a compression unit (not shown), a bearing, an oil supply passage 11, an oil return chamber C2, a seal and an air supply passage 14. The rotating shaft 10 passes through the motor cavity C1. The motor 4 is mounted on the rotating shaft 10 and is located in the motor cavity C1. The compression unit is drivingly connected to the rotating shaft 10 and is configured to compress a gaseous working medium. The rotating shaft 10 is rotatably supported on the bearing. The oil supply passage 11 is configured to supply oil to the bearing. The oil return chamber C2 is configured to receive return oil from the bearing. The seal is sleeved on the outer periphery of the rotating shaft 10 and is located between the bearing and the motor 4 along the axial direction of the rotating shaft 10. The axial ends of the seal are respectively located in the motor cavity C1 and the oil return chamber C2 to separate the motor cavity C1 and the oil return chamber C2. The air supply channel 14 is configured to pass a gaseous medium having a pressure greater than the oil return chamber pressure of the oil return chamber C2 into between the seal 3 and the rotating shaft 10 to form an air seal between the seal 3 and the rotating shaft 10 .

[0072] In the compressor of the embodiment of the present application, since an oil supply channel 14 is provided, the air supply channel 14 is configured to pass a gaseous working medium with a pressure greater than the oil return chamber pressure of the oil return chamber C2 into between the seal and the rotating shaft 10 so as to form an air seal between the seal 3 and the rotating shaft 10, which is beneficial to increase the air seal pressure, prevent the lubricating oil from entering the motor cavity, improve the oil return efficiency, and reduce the risk of compressor shaft seizure damage.

[0073] like Figure 2 As shown, in some embodiments of the compressor, along the axial direction of the rotating shaft 10, the outlet of the air supply passage 14 is located in the middle of the sealing member.

[0074] The outlet of the air supply channel 14 is located in the middle of the seal, which is conducive to the gaseous working medium flowing out of the outlet of the air supply channel 14 to flow to both axial ends of the seal at the same time, thereby facilitating better gas sealing.

[0075] like Figure 1 and Figure 2 As shown, in some embodiments of the compressor, the compressor further includes a bearing support for mounting the bearing and a motor housing 5. The air supply channel 14 includes: a motor housing channel section 141, which is arranged in the motor housing 5; a bearing support channel section 142, which is arranged in the bearing support; and a sealing member channel section 143, which is arranged in the sealing member.

[0076] The air supply channel 14 includes a motor housing channel section 141, a bearing support channel section 142, and a sealing channel section 143 arranged in the bearing support, which is beneficial for the air supply channel of the gaseous working fluid for gas sealing to pass through the existing components of the compressor, thereby simplifying the compressor structure.

[0077] like Figure 2 As shown, in some embodiments of the compressor, the air supply channel 14 includes a large diameter section and a small diameter section whose aperture is smaller than that of the large diameter section, which are arranged in sequence along the flow direction of the gaseous working medium, and the outlet of the small diameter section is the outlet of the air supply channel 14.

[0078] The air supply channel 14 includes a large diameter section and a small diameter section. When the gaseous medium for air sealing flows from the large diameter section to the small diameter section, the flow rate of the gaseous medium increases due to the sudden change in aperture, and the pressure is further increased, so that the air sealing effect is better, which is more conducive to preventing the lubricating oil from entering the motor cavity C1.

[0079] like Figure 2 As shown, in some embodiments of the compressor, the aperture of the small diameter section is 1 / 3 to 2 / 3 of the aperture of the large diameter section.

[0080] The aperture of the small diameter section is 1 / 3 to 2 / 3 of the aperture of the large diameter section, which can produce the effect of accelerating and pressurizing the gaseous working medium and also enable the gaseous working medium to smoothly enter the small diameter section.

[0081] like Figure 2 As shown, in some embodiments of the compressor, the aperture of the small diameter section is 1 / 2 of the aperture of the large diameter section.

[0082] The aperture of the small diameter section is 1 / 2 of the aperture of the large diameter section, which can achieve a better balance between speed-up and pressure-increasing of the gaseous working medium and smooth flow, and is conducive to using standard drill bits to process the small diameter section and the large diameter section respectively.

[0083] like Figure 2 and Figure 3 As shown, in some embodiments of the compressor, the compressor further includes a regulating valve 15 , and the regulating valve 15 is configured to adjust the flow rate of the gaseous working medium in the air supply channel 14 .

[0084] The regulating valve 15 is provided to adjust the flow rate of the gaseous working medium in the air supply passage 14 according to the operating requirements of the compressor, and is conducive to achieving a more effective seal between the seal and the rotating shaft 10 by adjusting the flow rate of the gaseous working medium for airtightness, while minimizing the impact of the introduction of gaseous working medium into the air supply passage 14 on the energy efficiency of the compressor, thereby comprehensively improving the operating reliability of the compressor.

[0085] like Figure 3As shown, in some embodiments of the compressor, the compressor also includes a detection device 20, which is configured to detect state parameters of the substance in the compressor, and the regulating valve 15 is configured to adjust the flow rate of the gaseous working medium in the air supply channel 14 according to the state parameters.

[0086] Setting up a detection device is beneficial to timely monitoring the state parameters of the material in the compressor, and the regulating valve 15 adjusts the flow rate of the gaseous working fluid for air sealing in the air supply channel 14 according to the state parameters, which is beneficial to automatically achieve a more effective seal between the seal and the rotating shaft 10 according to the operating conditions of the compressor, while minimizing the impact of the introduction of gaseous working fluid into the air supply channel 14 on the compressor.

[0087] like Figure 3 As shown, in some embodiments of the compressor, the detection device 20 includes: a first pressure sensor 201, configured to detect the motor cavity pressure, and the state parameters include the motor cavity pressure; and / or a second pressure sensor 202, configured to detect the return oil cavity pressure, and the state parameters include the return oil cavity pressure; and / or a temperature sensor 203, configured to detect the oil temperature of the oil in the return oil cavity, and the state parameters include the oil temperature; and / or a liquid level sensor 204, configured to detect the oil level of the oil in the return oil cavity, and the state parameters include the oil level.

[0088] The detection device includes a first pressure sensor 201 and / or a second pressure sensor 202 and / or a temperature sensor 203 and / or a liquid level sensor 204, which is beneficial to timely monitoring the motor cavity pressure and / or the return oil cavity pressure and / or the oil temperature of the oil in the return oil cavity and / or the oil level of the oil in the return oil cavity, and the regulating valve 15 adjusts the flow rate of the gaseous working fluid for air sealing in the air supply channel 14 according to the motor cavity pressure and / or the return oil cavity pressure and / or the oil temperature of the oil in the return oil cavity and / or the oil level of the oil in the return oil cavity, which is beneficial to automatically achieve a more effective seal between the seal and the rotating shaft 10 according to the state parameters of each substance in the compressor, and minimize the impact of the introduction of gaseous working fluid into the air supply channel 14 on the compressor.

[0089] In some embodiments of the compressor, during the operation of the compressor, the regulating valve 15 is configured to be in an open state, and wherein the regulating valve 15 is configured to reduce the opening when the difference between the motor cavity pressure and the return oil cavity pressure is greater than or equal to a first preset pressure difference, and to open or increase the opening when it is less than or equal to a second preset pressure difference, and the second preset pressure difference is less than the first preset pressure difference; and / or the regulating valve 15 is configured to reduce the opening when the motor cavity pressure is greater than or equal to a preset pressure; and / or the regulating valve 15 is configured to reduce the opening when the oil temperature is greater than or equal to a preset temperature; and / or the regulating valve 15 is configured to increase the opening when the oil level is greater than or equal to the first preset level, and to reduce the opening when the oil level is less than or equal to the second preset level, and the second preset level is less than the first preset level.

[0090] The various configurations of the above regulating valve 15 are all conducive to automatically achieving a more effective seal between the seal and the rotating shaft 10 according to the state parameters of each substance in the compressor, while minimizing the impact of the introduction of gaseous working fluid into the air supply channel 14 on the compressor. The control condition of the compressor's regulating valve can be any one, any several, or all of the control conditions involved in the various configurations. When there are multiple control conditions at the same time, the priority can be set according to the importance of different control conditions or the degree of influence on the compressor. When there is a conflict between different control conditions, the control condition with a high priority level will be controlled first. For example, among the above multiple control conditions, if they exist at the same time, the control condition related to the difference between the motor cavity pressure and the return oil cavity pressure can be used as the optimal control condition, followed by the control condition related to the motor cavity pressure, and then the control condition related to the oil temperature, and the control condition related to the oil level has the lowest priority.

[0091] The regulating valve 15 is configured to reduce the opening when the difference between the motor cavity pressure and the oil return cavity pressure is greater than or equal to the first preset pressure difference, and increase the opening when it is less than or equal to the second preset pressure difference, which is beneficial to keep the difference between the motor cavity pressure and the oil return cavity pressure within a certain range, thereby preventing the lubricating oil from entering the interior of the motor cavity C1 due to the difference between the motor cavity pressure and the oil return cavity pressure being too small, and also preventing the bearing from having poor oil supply due to the difference between the motor cavity pressure and the oil return cavity pressure being too large, thereby maintaining a reasonable flow rate of the gaseous working medium for air sealing, and minimizing the impact of the introduction of gaseous working medium into the air supply channel 14 on the energy efficiency of the compressor.

[0092] The regulating valve 15 is configured to reduce its opening when the motor cavity pressure is greater than or equal to a preset pressure, which helps to prevent the shaft 10 from shifting or vibrating more during movement due to excessive motor cavity pressure, and prevent excessive motor cavity pressure from hindering the oil inlet and return of the bearing, thereby preventing the lubricating oil from entering the interior of the motor cavity C1 while minimizing the impact on the axial force and oil return efficiency of the compressor operation.

[0093] Since the gaseous working fluid for the air seal needs to meet a certain pressure to better achieve the airtight effect of the shaft end of the motor, and the high-pressure gaseous working fluid often has a higher temperature, the regulating valve 15 is configured to reduce the opening when the oil temperature is greater than or equal to the preset temperature, which is conducive to achieving a more effective seal between the seal and the rotating shaft 10 while reducing the impact of the heat carried by the gaseous working fluid for the air seal on the bearing temperature.

[0094] The regulating valve 15 is configured to increase the opening when the oil level is greater than or equal to the first preset level, and reduce the opening when the oil level is less than or equal to the second preset level, which is conducive to achieving a more effective seal between the seal and the rotating shaft 10, while maintaining the oil level at a suitable height by adjusting the flow rate of the gaseous working medium for the gas seal. For example, when the oil level of the oil in the oil return chamber C2 is higher than the first preset level, the regulating valve 15 increases the opening, the pressure of the oil return chamber C2 increases, the oil temperature increases, the viscosity of the lubricating oil decreases, and the oil return efficiency is improved, and the oil level decreases; when the oil level of the oil in the oil return chamber C2 is lower than the second preset level, the regulating valve 15 decreases the opening, the pressure of the oil return chamber C2 decreases, the oil temperature decreases, the viscosity of the lubricating oil increases, the oil return becomes slower, and the oil level increases.

[0095] like Figure 3 As shown, in some embodiments of the compressor, the compressor also includes a control device 30, which is signal-connected to the detection device 20 and the regulating valve 15. The control device 30 is configured to control the action of the regulating valve 15 according to the state parameters detected by the detection device 20 to adjust the flow rate of the gaseous working medium in the air supply channel 14.

[0096] The compressor also includes a control device 30, which receives the state parameters detected by the detection device 20 and controls the operation of the regulating valve 15 according to the state parameters, so as to automatically, quickly and accurately adjust the flow of the gaseous working medium in the air supply channel 14 as expected, thereby better achieving the gas sealing effect and improving the oil return efficiency.

[0097] Among them, the control device 30 can be implemented as a general processor, a programmable logic controller (PLC), a digital signal processor (DSP), an application specific integrated circuit (ASIC), a field programmable gate array (FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components or any appropriate combination thereof for performing the functions described in the present disclosure.

[0098] The embodiment of the present application also provides an air-conditioning unit, including the compressor of the embodiment of the present application.

[0099] The air conditioning unit provided by the present application has the advantages of the compressor of the present application.

[0100] In some embodiments of the air conditioning unit, the refrigerant circulation loop of the air conditioning unit includes a compressor, a condenser, a throttling device and an evaporator connected by a refrigerant pipeline, characterized in that the gaseous working medium is a negative pressure refrigerant, and the air supply channel 14 of the compressor receives the high-temperature and high-pressure refrigerant gas in the refrigerant pipeline from the refrigerant circulation loop to form an air seal between the seal 3 and the rotating shaft 10. The high-temperature and high-pressure refrigerant gas is, for example, the refrigerant gas in the refrigerant pipeline between the compressor outlet and the condenser, and can also be the refrigerant gas in the condenser, etc.

[0101] When the gaseous working fluid is a negative pressure refrigerant, the inlet and outlet pressure difference of the compressor is smaller, and the sealing effect of the end of the motor is worse. The introduction of high-temperature and high-pressure refrigerant gas to form an air seal between the seal 3 and the rotating shaft 10 can more significantly improve the problem of lubricating oil entering the motor cavity, improve the oil return efficiency, and reduce the risk of compressor shaft seizure damage.

[0102] The following combination Figures 1 to 3 The compressor of the present application will be described in detail.

[0103] like Figure 1 The compressor of the embodiment of the present application is a negative pressure refrigerant compressor. The compressor includes two bearings, two bearing supports, two seals, a motor 4, a motor housing 5, an oil tank 9, a rotating shaft 10, an oil supply channel 11, an oil supply pipe 12, an oil return pipe 13, an air supply channel 14, a regulating valve 15, an air supply pipe 16, a detection device 20, a control device 30, a motor cavity C1, an oil return cavity C2 and two compression units. The compression unit is a centrifugal impeller.

[0104] The two bearings are respectively a front bearing 2 located at the left end of the motor 4 and a rear bearing 7 located at the right end of the motor 4. The two bearing supports are respectively a front bearing support 1 located at the left end of the motor 4 and a rear bearing support 8 located at the right end of the motor 4. The two seals are respectively a front seal 3 located at the left end of the motor 4 and a rear seal 6 located at the right end of the motor 4.

[0105] Two bearings, two bearing supports, two seals and the motor housing 5 constitute at least part of the cavity wall of the motor cavity C1. The oil return cavity C2 is located at both ends and the bottom of the motor cavity C1. The oil return cavity C2 is isolated from the motor cavity C1.

[0106] The rotating shaft 10 passes through the motor cavity C1. The motor 4 is mounted on the rotating shaft 10 and is located in the motor cavity C1. Two centrifugal impellers are respectively connected to the left and right ends of the rotating shaft 10 and are configured to compress the negative pressure refrigerant as a gaseous working medium. The two ends of the rotating shaft 10 are rotatably supported on two bearings.

[0107] The oil supply channel 11 is connected to the oil tank 9 through the oil supply pipe 12, and is used to transport the oil in the oil tank 9 to the two bearings respectively. The return oil chamber C2 is configured to receive the return oil from the bearing. The return oil pipe 13 is connected to the return oil chamber C2. The lubricating oil in the oil tank 9 is pumped into the high-position oil tank (not shown) of the motor housing 5 through an oil pump (not shown), and then flows to the bearing through the oil supply channel 11 processed inside the motor housing 5 and the bearing support. When the lubricating oil flows through the bearing, it can provide a certain oil film thickness to suspend the rotating shaft 10 to prevent dry grinding between the rotating shaft 10 and the bearing and cause shaft damage, and can also take away the heat generated by the rotation of the rotating shaft 10 to reduce the bearing temperature. The lubricating oil after flowing through the bearing will eventually be deposited at the bottom of the return oil chamber C2, and flow back to the oil tank 9 from the oil outlet through the return oil pipe by gravity.

[0108] Two seals are respectively mounted on the outer periphery of both ends of the rotating shaft 10, and are located between the corresponding bearing at one end and the motor 4 along the axial direction of the rotating shaft 10. The axial ends of each seal are respectively located in the motor cavity C1 and the oil return cavity C2 to separate the motor cavity C1 and the oil return cavity C2.

[0109] In the compressor of this embodiment, an air supply channel 14 is provided at each of the left and right ends of the motor 4, and the air supply channels at both ends can share the regulating valve 15 and the air supply pipe 16, or they can be provided with regulating valves and air supply pipes separately.

[0110] In the following description, only the air supply channel 14 at the left end of the motor 4 is used as an example to illustrate the supply of the working gas for gas sealing. The relevant description of the air supply channel at the right end of the motor 4 can refer to the air supply channel 14 at the left end, and no repeated description is made here.

[0111] The air supply passage 14 is configured to pass a high-temperature and high-pressure negative pressure refrigerant having a pressure greater than the oil return chamber pressure of the oil return chamber C2 between the front seal 3 and the rotating shaft 10 to form an air seal between the seal 3 and the rotating shaft 10. In this embodiment, the high-temperature and high-pressure negative pressure refrigerant is taken from the compressor outlet through the air supply pipe 16.

[0112] Along the axial direction of the rotating shaft 10, the outlet of the air supply channel 14 is located in the middle of the seal. The air supply channel 14 includes a motor housing channel section 141, a bearing support channel section 142 and a sealing channel section 143 which are sequentially arranged along the flow direction of the gaseous working medium. The motor housing channel section 141 is arranged in the motor housing 5; the bearing support channel section 142 is arranged in the front bearing support 1; and the sealing channel section 143 is arranged in the front seal 3. The air supply channel 14 is divided into a large diameter section and a small diameter section whose aperture is smaller than that of the large diameter section which are sequentially arranged along the flow direction of the gaseous working medium, and the outlet of the small diameter section is the outlet of the air supply channel 14. In this embodiment, the aperture of the small diameter section is 1 / 2 of the aperture of the large diameter section. As shown in FIG. Figure 2As shown, the motor housing channel section 141 and the bearing support channel section 142 are large-diameter sections, the upstream portion of the seal channel section 143 is a large-diameter section, and the downstream portion is a small-diameter section.

[0113] The regulating valve 15 is disposed on the gas supply pipe 16 and is configured to regulate the flow rate of the gaseous working medium in the gas supply channel 14 .

[0114] The detection device 20 is configured to detect the state parameters of the substance in the compressor, and the regulating valve 15 is configured to adjust the flow rate of the gaseous working medium in the air supply channel 14 according to the state parameters.

[0115] like Figure 3 As shown, the detection device 20 includes a first pressure sensor 201, a second pressure sensor 202, a temperature sensor 203 and a liquid level sensor 204. The first pressure sensor 201 is configured to detect the motor cavity pressure. The second pressure sensor 202 is configured to detect the oil return cavity pressure. The temperature sensor 203 is configured to detect the oil temperature of the oil in the oil return cavity. The liquid level sensor 204 is configured to detect the oil level of the oil in the oil return cavity. The state parameters include the motor cavity pressure, the oil return cavity pressure, the oil temperature and the oil level.

[0116] like Figure 3 As shown, the control device 30 is connected with the first pressure sensor 201, the second pressure sensor 202, the temperature sensor 203 and the liquid level sensor 204 of the detection device 20 and the regulating valve 15 signal to obtain the motor cavity pressure, the return oil cavity pressure, the oil temperature and the oil level, and controls the operation of the regulating valve 15 according to the motor cavity pressure, the return oil cavity pressure, the oil temperature and the oil level.

[0117] The regulating valve 15 needs to be opened just before the compressor is turned on. When the compressor is just turned on, the oil supply channel 11 supplies oil to the bearing, generating an oil film to suspend the rotating shaft 10. The pressure in the motor cavity C1 is relatively low, and the pressure in the oil return cavity C2 is greater than the pressure in the motor cavity C1. The amount of lubricating oil entering the motor cavity C1 is reduced by the sealing effect of the seal. Once the compression is started, the motor cavity pressure of the motor cavity C1 increases, and at the same time, the air supply channel 14 introduces a gaseous working medium with a pressure greater than the oil return cavity pressure of the oil return cavity C2 between the seal and the rotating shaft 10 to form an air seal between the seal 3 and the rotating shaft 10, thereby reducing the amount of lubricating oil entering the motor cavity C1.

[0118] In order to prevent lubricating oil from entering the motor cavity C1 and improve the oil return efficiency, the regulating valve 15 is set to be normally open during the operation of the compressor.

[0119] During the operation of the compressor, the regulating valve 15 is configured to be in an open state, and wherein the regulating valve 15 is configured to reduce the opening when the difference between the motor cavity pressure and the return oil cavity pressure is greater than or equal to a first preset pressure difference, and to open or increase the opening when it is less than or equal to a second preset pressure difference, and the second preset pressure difference is less than the first preset pressure difference; and / or the regulating valve 15 is configured to reduce the opening when the motor cavity pressure is greater than or equal to a preset pressure; and / or the regulating valve 15 is configured to reduce the opening when the oil temperature is greater than or equal to a preset temperature; and / or the regulating valve 15 is configured to increase the opening when the oil level is greater than or equal to the first preset level, and to reduce the opening when the oil level is less than or equal to the second preset level, and the second preset level is less than the first preset level.

[0120] The above preset parameters such as the first preset pressure difference, the second preset pressure difference, the preset pressure, the preset temperature, the first preset liquid level, the second preset liquid level, etc. can be set according to the structural parameters and operating parameters of the compressor and the unit in which it is located (for example, the air-conditioning unit in which the compressor is located), so that the regulating valve 15 adjusts the opening according to the preset parameters, which can reduce or avoid the lubricating oil from entering the motor cavity C1 without affecting the bearing lubrication, the compressor performance, etc.

[0121] For example, when the compressor is used in an air-conditioning unit, the structural parameters of the air-conditioning unit are different, the operating conditions and operating parameters are different, and the above preset parameters are also different. Taking the preset pressure as an example, when the working fluid is a negative pressure refrigerant, the preset pressure can be set to be 20kPa~40kPa higher than the evaporation pressure of the negative pressure refrigerant. The evaporation pressure refers to the pressure of the negative pressure refrigerant in the evaporator of the air-conditioning unit where the compressor is located. Taking the setting of the first preset pressure difference and the second preset pressure difference and the preset pressure as an example, the first preset pressure difference and the second preset pressure difference and the preset pressure are related to the pressure of the lubricating oil entering the bearing, the performance of the working fluid compressed by the compressor, and the vibration conditions that occur when the compressor is running. Taking the setting of the preset temperature as an example, for a compressor, the oil supply temperature of the lubricating oil delivered by the oil supply channel 11 is generally between 40°C and 45°C, and the bearing temperature of the air-conditioning unit is between 60°C and 75°C during normal operation. The temperature of the oil return chamber C2 is close to the bearing temperature, so the preset temperature can be set to 75°C. When the oil temperature is greater than or equal to 75°C, it means that the oil temperature exceeds the normal height. By reducing the opening of the regulating valve 15, the flow rate of the gaseous working medium for sealing can be reduced, thereby reducing the influence of the temperature of the gaseous working medium on the bearing temperature. Otherwise, there is no need to change the opening of the regulating valve 15 to control the oil temperature. Taking the first preset liquid level and the second preset liquid level as an example, the first preset liquid level and the second preset liquid level are related to the size of the air-conditioning unit, the amount of oil required, and the size of the oil tank.

[0122] Among the above four control conditions, the priority order is: the control condition related to the difference between the motor cavity pressure and the return oil cavity pressure is the optimal control condition, followed by the control condition related to the motor cavity pressure, then the control condition related to the oil temperature, and the control condition related to the oil level has the lowest priority.

[0123] In view of the low pressure difference of the negative pressure refrigerant compressor system and the poor air sealing effect at both ends of the motor 5, the lubricating oil may enter the motor cavity C1 and accumulate at the bottom of the motor cavity C1, which may easily lead to a small amount of oil return and insufficient oil supply, which may cause the compressor to be damaged due to lack of oil and shaft seizure. The present embodiment proposes a method of introducing high-temperature and high-pressure refrigerant gas between the seal and the rotating shaft 10 to increase the air sealing pressure, which is beneficial to prevent the lubricating oil from entering the motor cavity C1, and at the same time increase the pressure of the oil return cavity C2, thereby improving the oil return efficiency.

[0124] The present application sets a regulating valve 15 to regulate the flow rate of high-temperature and high-pressure refrigerant gas entering the air supply channel 14, which is beneficial to ensuring the improvement of the gas sealing pressure at the end of the motor 4, accelerating oil return, reducing the risk of compressor shaft damage, and reducing the impact on the energy efficiency of the compressor, thereby comprehensively improving the operating reliability of the negative pressure refrigerant compressor.

[0125] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present application and not to limit it. Although the present application has been described in detail with reference to the preferred embodiments, ordinary technicians in the relevant field should understand that the specific implementation methods of the present application can still be modified or some technical features can be replaced by equivalents, which should all be included in the scope of the technical solution requested for protection in this application.

Claims

1. A compressor, characterized in that: include: Motor cavity (C1); A rotating shaft (10) passes through the motor cavity (C1); A motor (4) mounted on the rotating shaft (10) and located in the motor cavity (C1); A compression unit, drivingly connected to the rotating shaft (10), configured to compress a gaseous working medium; A bearing, on which the rotating shaft (10) is rotatably supported; An oil supply channel (11) configured to supply oil to the bearing; an oil return chamber (C2) configured to receive return oil from the bearing; a sealing member, which is sleeved on the outer circumference of the rotating shaft (10) and is located between the bearing and the motor (4) along the axial direction of the rotating shaft (10), with the axial ends of the sealing member being respectively located at the motor cavity (C1) and the oil return cavity (C2) to separate the motor cavity (C1) and the oil return cavity (C2); and The air supply channel (14) is configured to pass the gaseous working medium having a pressure greater than the oil return chamber pressure of the oil return chamber (C2) between the sealing member and the rotating shaft (10) so as to form an air seal between the sealing member (3) and the rotating shaft (10).

2. The compressor according to claim 1, characterized in that Along the axial direction of the rotating shaft (10), the outlet of the air supply channel (14) is located in the middle of the sealing component.

3. The compressor according to claim 1, characterized in that It also includes a bearing support and a motor housing (5) for mounting the bearing, and the gas supply channel (14) includes: A motor housing channel section (141), arranged in the motor housing (5); A bearing support channel section (142) is disposed in the bearing support; and The sealing member channel section (143) is arranged in the sealing member.

4. The compressor according to claim 1, characterized in that The gas supply channel (14) comprises a large diameter section and a small diameter section whose aperture is smaller than that of the large diameter section, which are sequentially arranged along the flow direction of the gaseous working medium; the outlet of the small diameter section is the outlet of the gas supply channel (14).

5. The compressor according to claim 4, characterized in that The aperture of the small diameter section is 1 / 3 to 2 / 3 of the aperture of the large diameter section.

6. The compressor according to claim 5, characterized in that The aperture of the small diameter section is 1 / 2 of the aperture of the large diameter section.

7. The compressor according to any one of claims 1 to 6, characterized in that It also comprises a regulating valve (15), wherein the regulating valve (15) is configured to regulate the flow rate of the gaseous working medium in the gas supply channel (14).

8. The compressor according to claim 7, characterized in that It also comprises a detection device (20), the detection device (20) being configured to detect a state parameter of a substance in the compressor, and the regulating valve (15) being configured to adjust the flow rate of the gaseous working medium in the air supply channel (14) according to the state parameter.

9. The compressor according to claim 8, characterized in that The detection device (20) comprises: A first pressure sensor (201) is configured to detect the motor cavity pressure, wherein the state parameter includes the motor cavity pressure; and / or A second pressure sensor (202) is configured to detect the oil return chamber pressure, wherein the state parameter includes the oil return chamber pressure; and / or a temperature sensor (203) configured to detect the oil temperature of the oil in the oil return chamber, the state parameter including the oil temperature; and / or The liquid level sensor (204) is configured to detect the oil level of the oil in the oil return chamber, and the state parameter includes the oil level.

10. The compressor according to claim 9, characterized in that During the operation of the compressor, the regulating valve (15) is configured to be in an open state, and wherein: The regulating valve (15) is configured to reduce the opening when the difference between the motor chamber pressure and the oil return chamber pressure is greater than or equal to a first preset pressure difference, and increase the opening when it is less than or equal to a second preset pressure difference, the second preset pressure difference being less than the first preset pressure difference; and / or The regulating valve (15) is configured to reduce its opening when the pressure in the motor chamber is greater than or equal to a preset pressure; and / or The regulating valve (15) is configured to reduce its opening degree when the oil temperature is greater than or equal to a preset temperature; and / or The regulating valve (15) is configured to increase the opening when the oil level is greater than or equal to a first preset level, and to decrease the opening when the oil level is less than or equal to a second preset level, wherein the second preset level is lower than the first preset level.

11. The compressor according to claim 8, characterized in that It also comprises a control device (30) connected to the detection device (20) and the regulating valve (15) by signals, the control device (30) being configured to control the operation of the regulating valve (15) according to the state parameter detected by the detection device (20) so as to adjust the flow rate of the gaseous working medium in the gas supply channel (14).

12. An air conditioning unit, characterized in that: A compressor comprising the compressor according to any one of claims 1 to 11.

13. The air conditioning unit according to claim 12, characterized in that: The refrigerant circulation circuit of the air-conditioning unit includes a compressor, a condenser, a throttling device and an evaporator connected by a refrigerant pipeline, and is characterized in that the gaseous working medium is a negative pressure refrigerant, and the air supply channel (14) of the compressor receives the high-temperature and high-pressure refrigerant gas in the refrigerant pipeline from the refrigerant circulation circuit to form an air seal between the sealing member (3) and the rotating shaft (10).

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