Compressor and air conditioning unit

Abstract

The utility model 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, in particular to a compressor and an air conditioning unit. BACKGROUND

[0002] If the end of the motor of the compressor is not sealed well, the lubricating oil used for lubricating or bearing the bearing will enter the inside of the motor cavity and accumulate at the bottom of the motor cavity, thereby causing insufficient oil return and insufficient oil supply, resulting in damage of the compressor due to lack of oil. Especially for negative pressure refrigerant centrifugal machines, the problem of insufficient sealing effect of the end of the motor is more likely to exist due to low internal system pressure difference.

[0003] The above statements are only used to provide background technical information related to the present application, and do not necessarily constitute the prior art. CONTENT OF THE UTILITY MODEL

[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 of the end of the motor of the compressor.

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

[0006] a motor cavity;

[0007] a rotating shaft passing through the motor cavity;

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

[0009] a compression unit drivingly connected with 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 channel configured to supply oil to the bearing;

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

[0013] a sealing element sleeved on the outer periphery of the rotating shaft and located between the bearing and the motor along the axial direction of the rotating shaft, both axial ends of the sealing element being located in the motor cavity and the oil return cavity respectively to separate the motor cavity and the oil return cavity; and

[0014] a gas supply channel configured to supply the gaseous working medium with a pressure greater than the oil cavity pressure of the oil return cavity between the sealing element and the rotating shaft to form a gas seal between the sealing element and the rotating shaft.

[0015] In some embodiments of the compressor, along the axial direction of the rotating shaft, the outlet of the gas supply channel is located in the middle part of the sealing element.

[0016] In some embodiments of the compressor, the compressor further comprises a bearing support and a motor housing for mounting the bearing, the gas supply passage comprises, in sequence along the flow direction of the gaseous working medium:

[0017] a motor housing passage section arranged in the motor housing;

[0018] a bearing support passage section arranged in the bearing support; and

[0019] a seal passage section arranged in the seal.

[0020] In some embodiments of the compressor, the gas supply passage comprises, in sequence along the flow direction of the gaseous working medium, a large-diameter section and a small-diameter section with a bore smaller than that of the large-diameter section, and an outlet of the small-diameter section is an outlet of the gas supply passage.

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

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

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

[0024] In some embodiments of the compressor, the compressor further comprises a detection device configured to detect a state parameter of a substance in the compressor, and the regulating valve is configured to regulate the flow rate of the gaseous working medium in the gas supply passage according to the state parameter.

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

[0026] a first pressure sensor configured to detect the motor cavity pressure, and the state parameter comprises the motor cavity pressure; and / or

[0027] a second pressure sensor configured to detect the oil return cavity pressure, and the state parameter comprises the oil return cavity pressure; and / or

[0028] a temperature sensor configured to detect an oil temperature of the oil in the oil return cavity, and the state parameter comprises the oil temperature; and / or

[0029] a liquid level sensor configured to detect an oil liquid level of the oil in the oil return cavity, and the state parameter comprises the oil liquid level.

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

[0031] the regulating valve is configured to decrease the opening degree when the difference between the motor cavity pressure and the oil return cavity pressure is greater than or equal to a first preset pressure difference, and to increase the opening degree when the difference between the motor cavity pressure and the oil return cavity pressure 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

[0032] the regulating valve is configured to decrease the opening degree when the motor cavity pressure is greater than or equal to a preset pressure; and / or

[0033] the regulating valve is configured to decrease the opening degree 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 degree when the oil level is greater than or equal to a first preset level, and to decrease the opening degree when the oil level is less than or equal to a second preset level, the second preset level being less than the first preset level.

[0035] In some embodiments of the compressor, the compressor further comprises a control device connected to the detection device and the regulating valve, the control device being configured to control the regulating valve to act according to the state parameters detected by the detection device to adjust the flow of the gaseous working medium in the gas supply passage.

[0036] The second aspect of the present application provides an air conditioning unit comprising the compressor of 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 comprises a compressor, a condenser, a throttling device and an evaporator connected by refrigerant pipelines, characterized in that the gaseous working medium is negative pressure refrigerant, and the gas supply passage of the compressor receives high temperature and high pressure refrigerant gas in the refrigerant pipelines from the refrigerant circulation loop for forming a gas seal between the sealing member and the shaft.

[0038] Based on the compressor provided by the present application, since the oil supply passage is provided, the gas supply passage is configured to introduce the gaseous working medium with a pressure greater than the oil return cavity pressure of the oil return cavity between the sealing member and the shaft for forming a gas seal between the sealing member and the shaft, which is beneficial to improve the gas seal pressure, prevent the lubricating oil from entering the motor cavity, improve the oil return efficiency and reduce the risk of shaft seizure damage of the compressor.

[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 thereof, taken in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF DRAWINGS

[0041] The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiments of the application and together with the description serve to explain the application. In the drawings:

[0042] Figure 1 A schematic view of a cross-sectional structure of the compressor from one angle according to an embodiment of the application.

[0043] Figure 2 A schematic view of a partial cross-sectional structure of the compressor from another angle according to an embodiment of the application.

[0044] Figure 3 A schematic view of a control principle of the regulating valve according to an embodiment of the application.

[0045] Figures 1 to 3 In the drawings, the reference numerals respectively represent:

[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. oil tank;

[0055] 10. rotating shaft;

[0056] 11. oil supply passage;

[0057] 12. oil supply pipe;

[0058] 13. oil return pipe;

[0059] 14. gas supply passage; 141. motor housing passage section; 142. bearing support passage section; 143. seal passage section;

[0060] 15. regulating valve;

[0061] 16. gas 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 cavity. DETAILED DESCRIPTION

[0066] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. The following description of at least one exemplary embodiment is merely illustrative in nature and not intended to be limiting on the application or its application or uses. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work are within the scope of protection of the present application.

[0067] Unless otherwise specifically stated, the relative arrangements of parts and steps, numerical expressions, and numerical values set forth in the various examples herein are not meant to limit the scope of the present application. Also, it is to be understood that the drawings are not necessarily to scale and that examples can have different conventional dimensions than those shown in the drawings. Technical, methods, and apparatus known to those of ordinary skill in the relevant art can not be discussed in detail, but should be considered as part of the description. In all examples shown and discussed herein, any specific value should be interpreted as merely an example, and not as a limitation. Thus, other examples of the exemplary embodiments can have different values. It should be noted that like reference numerals and letters refer to like items in the following drawings, and thus, once an item is defined in one drawing, it need not be discussed further in subsequent drawings.

[0068] In the description of the present application, it should be understood that the use of the words "first", "second", and the like, to describe various components, is merely intended to differentiate one component from another, and does not imply a special order or sequence of the components, unless otherwise specifically stated. Therefore, the above words should not be interpreted as limiting the scope of the present application.

[0069] In the description of the present application, it should be understood that the orientation words such as "front, back, up, down, left, right", "horizontal, vertical, perpendicular, horizontal", and "top, bottom" and the like indicate the orientation or positional relationship shown in the drawings, and are only used for the convenience of describing the present application and simplifying the description. Without the opposite statement, these orientation words do not indicate and imply that the indicated device or element must have a particular orientation or be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the scope of the present application; the orientation words "inner, outer" refer to the inner and outer of the contour of the parts themselves.

[0070] In addition, the technical features involved in the different embodiments of the application described below can be combined with each other as long as there is no conflict.

[0071] As shown in Figures 1 to 2 , the embodiment of the application provides a compressor. The compressor comprises a motor cavity C1, a rotating shaft 10, a motor 4, a compression unit (not shown), a bearing, an oil supply channel 11, an oil return cavity C2, a sealing element and a gas supply channel 14. The rotating shaft 10 passes through the motor cavity C1. The motor 4 is mounted on the rotating shaft 10 and located in the motor cavity C1. The compression unit is drivingly connected with 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 channel 11 is configured to supply oil to the bearing. The oil return cavity C2 is configured to receive oil returned from the bearing. The sealing element is sleeved on the outer periphery of the rotating shaft 10 and located between the bearing and the motor 4 in the axial direction of the rotating shaft 10. The axial ends of the sealing element are located in the motor cavity C1 and the oil return cavity C2 respectively to separate the motor cavity C1 and the oil return cavity C2. The gas supply channel 14 is configured to supply the gaseous working medium with a pressure greater than the oil return cavity pressure of the oil return cavity C2 to the space between the sealing element and the rotating shaft 10 to form an air seal between the sealing element 3 and the rotating shaft 10.

[0072] In the compressor of the embodiment of the application, the oil supply channel 14 is configured to supply the gaseous working medium with a pressure greater than the oil return cavity pressure of the oil return cavity C2 to the space between the sealing element and the rotating shaft 10 to form an air seal between the sealing element 3 and the rotating shaft 10, which is conducive to improving the air seal pressure, preventing the lubricating oil from entering the inside of the motor cavity, improving the oil return efficiency and reducing the risk of shaft seizure damage of the compressor.

[0073] As shown in Figure 2 , in some embodiments of the compressor, in the axial direction of the rotating shaft 10, the outlet of the gas supply channel 14 is located in the middle of the sealing element.

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

[0075] As shown in Figure 1 and Figure 2 , in some embodiments of the compressor, the compressor further comprises a bearing support for mounting the bearing and a motor housing 5. The gas supply channel 14 comprises, in sequence along the flow direction of the gaseous working medium: a motor housing channel segment 141 arranged in the motor housing 5; a bearing support channel segment 142 arranged in the bearing support; and a sealing element channel segment 143 arranged in the sealing element.

[0076] The gas supply channel 14 comprises a motor housing channel segment 141, a bearing support channel segment 142, a sealing channel segment 143 arranged in the bearing support, and a channel segment 144 arranged in the sealing member, so that the gas supply channel of the gaseous working medium in the compressor is passed through the existing components of the compressor, thereby simplifying the structure of the compressor.

[0077] As shown in the compressor of some embodiments, Figure 2 the gas supply channel 14 comprises a large-diameter segment and a small-diameter segment with a smaller diameter than the large-diameter segment arranged in sequence along the flow direction of the gaseous working medium, and the outlet of the small-diameter segment is the outlet of the gas supply channel 14.

[0078] The gas supply channel 14 comprises a large-diameter segment and a small-diameter segment, and when the gaseous working medium for the gas seal flows from the large-diameter segment to the small-diameter segment, the flow rate of the gaseous working medium increases due to the sudden change in the diameter, the pressure is further increased, and the gas sealing effect is better, thereby more effectively preventing the lubricating oil from entering the motor cavity C1.

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

[0080] Making the diameter of the small-diameter segment 1 / 3 to 2 / 3 of the diameter of the large-diameter segment can not only achieve the effect of increasing the speed and pressure of the gaseous working medium, but also enable the gaseous working medium to smoothly enter the small-diameter segment.

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

[0082] The diameter of the small-diameter segment is 1 / 2 of the diameter of the large-diameter segment, which can better balance the speed and pressure of the gaseous working medium and the smooth flow of the gaseous working medium, and is conducive to the use of standard drill bits for the small-diameter segment and the large-diameter segment.

[0083] As shown in the compressor of some embodiments, Figure 2 and Figure 3 the compressor further comprises an adjusting valve 15 configured to adjust the flow rate of the gaseous working medium in the gas supply channel 14.

[0084] The adjusting valve 15 is arranged to adjust the flow rate of the gaseous working medium in the gas supply channel 14 according to the operating conditions of the compressor, so as to minimize the impact of the introduction of the gaseous working medium into the gas supply channel 14 on the energy efficiency of the compressor while achieving more effective sealing between the sealing member and the shaft 10, thereby improving the operating reliability of the compressor.

[0085] As shown in the compressor of some embodiments, Figure 3As shown, in some embodiments of the compressor, the compressor further 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 medium 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, and minimizes the impact of the introduction of gaseous working medium 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 conducive to timely monitoring of 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 conducive to automatically achieving more effective sealing between the seal and the rotating shaft 10 according to the state parameters of each substance in the compressor, and minimizing the impact of introducing 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 regulating valve 15 are all conducive to automatically achieving more effective sealing between the sealing member and the rotating shaft 10 according to the state parameters of the substances in the compressor while minimizing the impact of introducing the gaseous working medium into the gas supply passage 14 on the compressor. The regulating conditions of the regulating valve of the compressor can be any one or any combination or all of the regulating conditions involved in the various configurations. When there are multiple regulating conditions, priorities can be set according to the importance of different control conditions or the degree of impact on the compressor, and when different regulating conditions conflict, the regulating condition with the highest priority is regulated first. For example, among the above multiple regulating conditions, if they exist at the same time, the regulating condition related to the difference between the motor cavity pressure and the oil return cavity pressure can be taken as the optimal regulating condition, the regulating condition related to the motor cavity pressure is the second, the regulating condition related to the oil temperature is the third, and the regulating condition related to the oil level is the lowest in priority.

[0091] The regulating valve 15 is configured to decrease 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 to increase the opening when the difference is less than or equal to the second preset pressure difference, which is conducive to keeping 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 preventing the bearings from being starved of oil due to the difference between the motor cavity pressure and the oil return cavity pressure being too large, thereby helping to maintain a reasonable flow of gaseous working medium for air sealing and minimizing the impact of introducing the gaseous working medium into the gas supply passage 14 on the efficiency of the compressor.

[0092] The regulating valve 15 is configured to decrease the opening when the motor cavity pressure is greater than or equal to the preset pressure, which is conducive to preventing adverse effects such as the rotating shaft 10 deviating or vibrating excessively during movement due to excessive motor cavity pressure, and preventing the motor cavity pressure from being too high to hinder oil supply and return to the bearings, 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.

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

[0094] The regulating valve 15 is configured to increase its opening when the oil level is greater than or equal to a first preset level, and decrease its opening when the oil level is less than or equal to a second preset level. This facilitates achieving a more effective seal between the seal and the rotating shaft 10 while maintaining the oil level at an appropriate height by regulating the flow rate of the gaseous working medium for the gas seal. For example, when the oil level in the oil return chamber C2 is higher than the first preset level, the regulating valve 15 increases its opening, which increases the pressure in the oil return chamber C2, increases the oil temperature, decreases the viscosity of the lubricating oil, improves the oil return efficiency, and reduces the oil level. When the oil level in the oil return chamber C2 is lower than the second preset level, the regulating valve 15 decreases its opening, which decreases the pressure in the oil return chamber C2, decreases the oil temperature, increases the viscosity of the lubricating oil, slows the oil return, and increases the oil level.

[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 action 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] The control device 30 may be implemented as a general-purpose 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] An embodiment of the present application also provides an air-conditioning unit, comprising the compressor of an 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 comprises a compressor, a condenser, a throttling device and an evaporator connected by refrigerant pipelines, characterized in that the gaseous working medium is negative pressure refrigerant, and the compressor is provided with a gas supply passage 14 for receiving high temperature and high pressure refrigerant gas in the refrigerant pipeline from the refrigerant circulation loop for forming a gas seal between the sealing member 3 and the rotating shaft 10. The high temperature and high pressure refrigerant gas can be, for example, refrigerant gas in the refrigerant pipeline between the compressor outlet and the condenser, refrigerant gas in the condenser, etc.

[0101] When the gaseous working medium is negative pressure refrigerant, the pressure difference between the inlet and outlet of the compressor is smaller, and the sealing effect of the end of the motor is poorer. Introducing high temperature and high pressure refrigerant gas for forming a gas seal between the sealing member 3 and the rotating shaft 10 can more significantly improve the problem of lubricating oil entering the inside of the motor cavity, improve the oil return efficiency, and reduce the risk of shaft seizure damage of the compressor.

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

[0103] As Figure 1 , the compressor of the embodiments of the present application is a negative pressure refrigerant compressor. The compressor comprises two bearings, two bearing supports, two sealing members, a motor 4, a motor housing 5, an oil tank 9, a rotating shaft 10, an oil supply passage 11, an oil supply pipe 12, an oil return pipe 13, a gas supply passage 14, a regulating valve 15, a gas 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 units are centrifugal impellers.

[0104] The two bearings are 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 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 sealing members are a front sealing member 3 located at the left end of the motor 4 and a rear sealing member 6 located at the right end of the motor 4.

[0105] The two bearings, the two bearing supports, the two sealing members 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 located in the motor cavity C1. The two centrifugal impellers are drivingly connected to the left and right ends of the rotating shaft 10 and are configured to compress negative pressure refrigerant as gaseous working medium. The two ends of the rotating shaft 10 are rotatably supported on the two bearings.

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

[0108] The two seals are respectively sleeved on the outer periphery of the two ends of the rotating shaft 10 and are located between the corresponding end bearing 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 the embodiment, the left and right ends of the motor 4 are respectively provided with a gas supply passage 14, and the two end gas supply passages can share an adjusting valve 15 and a gas supply pipe 16, or can be respectively provided with an adjusting valve and a gas supply pipe.

[0110] In the following description, only the gas supply passage 14 at the left end of the motor 4 is taken as an example to illustrate the supply of the working gas for the gas seal, and the relevant description of the gas supply passage at the right end of the motor 4 can be referred to the gas supply passage 14 at the left end, which will not be described repeatedly here.

[0111] The gas supply passage 14 is configured to introduce high-temperature and high-pressure negative-pressure refrigerant with a pressure greater than the oil return cavity pressure of the oil return cavity C2 between the front seal 3 and the rotating shaft 10, so as to form a gas seal between the seal 3 and the rotating shaft 10. In the embodiment, the high-temperature and high-pressure negative-pressure refrigerant is taken from the compressor outlet through the gas supply pipe 16.

[0112] In the axial direction of the rotating shaft 10, the outlet of the gas supply passage 14 is located in the middle of the seal. The gas supply passage 14 includes a motor housing passage section 141, a bearing support passage section 142 and a seal passage section 143 arranged in sequence along the flow direction of the gaseous working medium. The motor housing passage section 141 is arranged in the motor housing 5; the bearing support passage section 142 is arranged in the front bearing support 1; and the seal passage section 143 is arranged in the front seal 3. Among them, the gas supply passage 14 is divided into a large-diameter section and a small-diameter section with a smaller hole diameter than the large-diameter section along the flow direction of the gaseous working medium, and the outlet of the small-diameter section is the outlet of the gas supply passage 14. In the embodiment, the hole diameter of the small-diameter section is 1 / 2 of the hole diameter of the large-diameter section. For example, Figure 2As shown, the motor housing passage segment 141 and the bearing support passage segment 142 are large-diameter segments, and the upstream portion of the seal passage segment 143 is a large-diameter segment and the downstream portion is a small-diameter segment.

[0113] The regulating valve 15 is arranged on the gas supply pipe 16. It is configured to regulate the flow of the gaseous working medium in the gas supply passage 14.

[0114] The detection device 20 is configured to detect a state parameter of the substance in the compressor, and the regulating valve 15 is configured to regulate the flow of the gaseous working medium in the gas supply passage 14 according to the state parameter.

[0115] As shown, Figure 3 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 parameter includes the motor cavity pressure, the oil return cavity pressure, the oil temperature, and the oil level.

[0116] As shown, Figure 3 The control device 30 is signal 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, obtains the motor cavity pressure, the oil return cavity pressure, the oil temperature, and the oil level, and controls the action of the regulating valve 15 according to the motor cavity pressure, the oil return cavity pressure, the oil temperature, and the oil level.

[0117] The regulating valve 15 needs to be opened before the compressor is started. When the compressor is started, the oil supply passage 11 supplies oil to the bearing, generates an oil film to suspend the shaft 10, the motor cavity C1 pressure is low, the oil return cavity C2 pressure is greater than the motor cavity C1 pressure, and 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 C1 pressure rises, and the gas supply passage 14 introduces a gaseous working medium with a pressure greater than the oil return cavity C2 pressure between the seal and the shaft 10 to form a gas seal between the seal 3 and the shaft 10, so that the amount of lubricating oil entering the motor cavity C1 is reduced.

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

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

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

[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 medium is 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 in which the compressor is located. Taking the settings of the first preset pressure difference, the second preset pressure difference, and the preset pressure as an example, the first preset pressure difference, the second preset pressure difference, and the preset pressure are related to the pressure at which the lubricating oil enters the bearing, the performance of the working medium compressed by the compressor, and the vibration conditions during the operation of the compressor. Taking the setting of the preset temperature as an example, for the compressor, the oil supply temperature of the lubricating oil delivered by the oil supply channel 11 is generally 40℃ to 45℃, the bearing temperature during normal operation of the air conditioning unit is 60℃ to 75℃, and the temperature of the oil return cavity C2 is similar to the bearing temperature. Therefore, the preset temperature can be set to 75℃, and when the oil temperature is greater than or equal to 75℃, it represents that the oil temperature exceeds the normal level, and by reducing the opening degree of the regulating valve 15, the flow of the gaseous working medium for sealing can be reduced, thereby reducing the influence of the gaseous working medium temperature on the bearing temperature, otherwise there is no need to change the opening degree of the regulating valve 15 for controlling the oil temperature. Taking the first preset level and the second preset level as an example, the first preset level and the second preset 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 regulation conditions, the priority order is: the regulation condition related to the difference between the motor cavity pressure and the oil return cavity pressure is the optimal regulation condition, the regulation condition related to the motor cavity pressure is the second, the regulation condition related to the oil temperature is the third, and the regulation condition related to the oil level is the lowest.

[0123] The embodiment is aimed at the problem that the pressure difference of the negative pressure refrigerant compressor system is low, the gas seal effect of the motor 5 is poor, the lubricating oil may enter the inside of the motor cavity C1, accumulate at the bottom of the motor cavity C1, and easily lead to insufficient oil return, insufficient oil supply, and possible oil-starved shaft seizure damage of the compressor. The embodiment proposes a way of introducing high-temperature and high-pressure refrigerant gas between the sealing element and the shaft 10 to improve the gas seal pressure, which is beneficial to prevent the lubricating oil from entering the inside of the motor cavity C1 and at the same time increase the pressure of the oil return cavity C2 to improve the oil return efficiency.

[0124] The application sets the adjusting valve 15 to regulate the flow of high-temperature and high-pressure refrigerant gas entering the gas supply channel 14, which is beneficial to ensure the improvement of the gas seal pressure at the end of the motor 4, to speed up the oil return, to reduce the risk of compressor shaft seizure damage, and to reduce the impact on the compressor efficiency, thereby comprehensively improving the operation reliability of the negative pressure refrigerant compressor.

[0125] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the application and not to limit them; although the application has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the specific embodiments of the application can be modified or some technical features can be replaced by equivalent ones, which should be covered in the technical solution range claimed by the 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) is mounted on the rotating shaft (10) and is 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 seal, sleeved on the outer periphery of the rotating shaft (10), and located between the bearing and the motor (4) along the axial direction of the rotating shaft (10), with the axial ends of the seal 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); 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) 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 air supply channel (14) includes the following components arranged in sequence along the flow direction of the gaseous working medium: A motor housing channel section (141) is disposed in the motor housing (5); A bearing support channel section (142) disposed within 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 having a smaller aperture 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 includes a regulating valve (15), which is configured to regulate the flow of the gaseous working medium in the gas supply channel (14).

8. The compressor according to claim 7, characterized in that It also includes a detection device (20), which is configured to detect a state parameter of a 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 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, the state parameter including 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 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 less than the first preset level.

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

12. An air conditioning unit, characterized in that: The compressor comprises 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 through a refrigerant pipeline. The gaseous working medium is a negative pressure refrigerant. The air supply channel (14) of the compressor receives 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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