Centrifugal machine and air conditioning system

Abstract

The utility model discloses a centrifugal machine and an air conditioning system. The centrifugal machine comprises a shell, a bearing protection part, a volute and an impeller, wherein a first cavity is formed in the shell; the bearing protection part is arranged on the shell and forms a bearing cavity communicated with the first cavity, and a bearing used for supporting the pivotal shaft is arranged in the bearing cavity; the volute is arranged on the shell, and a second cavity is defined between the volute and the shell. The impeller is connected with the pivot shaft and is rotatably arranged on the volute; a first channel for communicating the second cavity with the bearing cavity is formed between the impeller and the shell; a second channel communicated with the bearing cavity is formed in the shell. According to the centrifugal machine, the second channel is arranged on the shell to introduce low-temperature and high-pressure gas to be opposite to high-temperature and high-pressure gas in the first channel, the gas leakage loss of the first channel is reduced, the efficiency of the centrifugal machine is improved, meanwhile, the low-temperature gas enters the motor cavity to cool and dissipate heat of electrical components, and the service life of the centrifugal machine is prolonged. The service life of the centrifuge is prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of centrifuges, in particular to a centrifuge and an air conditioning system. Background Art

[0002] Centrifuges are widely used in the industrial field, mainly in high-speed rotating machines such as centrifugal refrigeration compressors, air compressors, and blowers. The common feature of these machines is that the impeller rotates at high speed to centrifugally compress the gas. While the impeller is compressing, the gap between the rotor and the stator will cause the gas in the impeller compressor to leak along the rotor and the stator, resulting in leakage losses and reduced compressor efficiency. At the same time, the gas compressed by structures such as traditional air compressors has a very high temperature. The leakage of gas into the motor cavity will cause the temperature of the electrical components in the motor cavity to be too high, which will reduce the life of the electrical components or even cause direct failure. Utility Model Content

[0003] The utility model aims to solve at least one of the technical problems existing in the prior art. To this end, one purpose of the utility model is to provide a centrifuge. According to the centrifuge of the utility model, by setting a second channel on the shell to introduce low-temperature high-pressure gas to counteract the high-temperature high-pressure gas in the first channel, the gas leakage loss in the first channel is reduced, the efficiency of the centrifuge is improved, and at the same time, it can also prevent high-temperature gas from entering the motor cavity and damaging the electrical components in the motor cavity, and cool the electrical components to dissipate heat, thereby improving the service life of the centrifuge.

[0004] The utility model also provides an air conditioning system comprising the centrifuge.

[0005] According to the utility model, a centrifuge includes a casing, a bearing protection part, a volute and an impeller, wherein a first cavity is formed in the casing; the bearing protection part is arranged on the casing and forms a bearing cavity connected with the first cavity, and a bearing for supporting a pivot shaft is arranged in the bearing cavity; the volute is arranged on the casing and defines a second cavity between the volute and the casing; the impeller is connected to the pivot shaft and rotatably arranged on the volute, and a first channel connecting the second cavity with the bearing cavity is formed between the impeller and the casing; wherein a second channel connected with the bearing cavity is formed on the casing, and the second channel is suitable for connecting with the outlet of a cooling device to input low-temperature gas into the bearing cavity.

[0006] According to the centrifuge of the utility model, a first cavity is defined in the casing for assembling the structural components of the centrifuge, a volute is provided in the first cavity, the volute can define a second cavity in the first cavity, the second cavity can be used to assemble the impeller of the centrifuge, the impeller is connected to the pivot shaft so as to rotate in the second cavity to realize the function of compressing gas in the centrifuge. When the impeller is assembled in the volute, the high-pressure gas generated by the impeller's rotation and compression can flow in the first cavity formed by the volute and can flow into other structures outside the centrifuge through the volute. After the impeller is assembled, a first channel connecting the second cavity and the bearing cavity will be formed between the impeller and the casing. The first channel here can be understood as the gap generated between the impeller and the casing when the impeller is assembled. The gas leakage of the centrifuge in the background technology can be understood as the gas compressed by the impeller entering the bearing cavity and the motor cavity and other areas through the first channel. Therefore, the centrifuge can be provided with a second channel connected to the bearing cavity on the casing. The second channel can introduce external high-pressure gas into the bearing cavity and offset the high-pressure gas flowing toward the bearing cavity in the first channel to prevent the high-pressure gas generated by the impeller from entering the bearing cavity through the first channel, thereby reducing the gas leakage loss of the centrifuge and improving the efficiency of the centrifuge. At the same time, it can also prevent high-temperature gas from entering the motor cavity and damaging the electrical components in the motor cavity, thereby improving the safety of the electrical components in the motor cavity.

[0007] According to an embodiment of the present invention, a first flow blocking member is formed in the first channel.

[0008] According to one embodiment of the utility model, a first wall facing the shell is formed on the impeller, a second wall opposite to the first wall is formed on the shell, and the first channel is formed between the first wall and the second wall; wherein a protruding first baffle is formed on at least one of the first wall and the second wall.

[0009] According to one embodiment of the utility model, a first sealing tooth is formed on the first wall, and a second sealing tooth is formed on the second wall. The first sealing tooth and the second sealing tooth are respectively constructed as a plurality of teeth staggered in the extension direction of the first channel, and the first sealing tooth and the second sealing tooth are constructed as the first flow blocking member.

[0010] According to an embodiment of the utility model, the centrifuge further comprises: a thrust portion, which is arranged on a side of the bearing protection portion away from the impeller, a third channel is formed between the thrust portion and the bearing protection portion, and a second flow blocking member is formed in the third channel.

[0011] According to an embodiment of the utility model, the bearing protection portion is formed with a third wall, the thrust portion is formed with a fourth wall directly opposite to the third wall, and at least one of the third wall and the fourth wall is formed with a protruding second baffle.

[0012] According to an embodiment of the present utility model, a heat-insulating cavity is formed on the shell, and the heat-insulating cavity is located on a side of the second passage close to the volute.

[0013] According to one embodiment of the utility model, the shell includes a shell body, a diffuser and a sealing portion, a first cavity is formed in the shell body, and the bearing protection portion is connected to the shell body; the diffuser is arranged in the shell body and the volute is arranged on the other side of the diffuser, a first radial channel and the insulation cavity are formed in the diffuser, and a connecting hole for the pivot shaft to pass through is formed on the diffuser; the sealing portion is arranged in the connecting hole and the sealing portion is sleeved on the outer periphery of the pivot shaft, a second radial channel connected to the first radial channel is formed on the sealing portion, and the first radial channel and the second radial channel are configured as the second channel, and the first channel is formed between the sealing portion and the impeller.

[0014] According to an embodiment of the utility model, a first positioning portion is formed on the diffuser, and a second positioning portion is formed on the sealing portion, and the first positioning portion cooperates with the second positioning portion to be suitable for positioning the first radial channel and the second radial channel.

[0015] In summary, the centrifuge is provided with a shell body as the outer shell of the entire centrifuge and a first cavity is defined in the shell body for assembling structural components such as the pivot shaft of the centrifuge. A diffuser is provided on the shell body, and a connecting hole for supporting the pivot shaft is formed in the center of the diffuser, and a sealing part sleeved on the outer periphery of the pivot shaft is accommodated in the connecting hole. A volute is provided on one side of the sealing part, and an impeller connected to the pivot shaft and a second cavity for accommodating the high-temperature and high-pressure gas generated by the operation of the impeller are rotatably arranged in the volute; a thrust part sleeved on the outer periphery of the pivot shaft is provided on the other side of the sealing part. Such a setting method improves the compactness of the structure of the centrifuge, can reduce the volume of the centrifuge, and facilitates the assembly of the centrifuge. A first channel connected to the second cavity is formed between the impeller and the sealing part; a third channel connected to the second channel and the motor cavity is formed between the sealing part and the thrust part; a second channel connected to the intercooler and respectively connected to the first channel and the third channel is formed between the sealing part and the diffuser. Among them, a first baffle is arranged in the first channel, and a second baffle is arranged in the third channel. The first baffle and the second baffle can reduce the gas leakage loss of the centrifuge. The second channel can introduce the low-temperature and high-pressure gas in the intercooler and offset it with the high-temperature and high-pressure gas leaking in the first channel. After the low-temperature and high-pressure gas enters the centrifuge through the second channel, due to the obstruction of the second baffle 6, the low-temperature and high-pressure gas will not directly enter the motor cavity through the third channel, but will remain in the bearing cavity. At this time, the pressure in the bearing cavity is close to the pressure of the high-pressure gas leaking in the first channel. Therefore, the air pressure between the second cavity and the bearing cavity is balanced, and the high-temperature and high-pressure gas in the second cavity is difficult to leak through the first channel, which further reduces the gas leakage of the centrifuge while preventing the high-temperature gas from entering the motor cavity, thereby improving the efficiency and service life of the centrifuge.

[0016] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0018] Figure 1 is a structural diagram of a centrifuge according to an embodiment of the utility model;

[0019] Figure 2 It is a partial enlarged view according to an embodiment of the utility model;

[0020] Figure 3 It is a schematic diagram of the gas flow direction of the second channel according to an embodiment of the utility model.

[0021] Reference numerals:

[0022] Centrifuge 1;

[0023] The housing 11, the housing body 111, the diffuser 112, the first radial passage 1121, the heat insulating cavity 1122, the sealing portion 113, the second radial passage 1131, and the second wall 1132;

[0024] The bearing protection portion 12 and the third wall 121;

[0025] volute 13;

[0026] Impeller 14, first wall 141;

[0027] A first channel 151, a second channel 152, and a third channel 153;

[0028] A first spoiler 161, a first sealing tooth 1611, a second sealing tooth 1612, and a second spoiler 162;

[0029] The thrust portion 17 , the fourth wall 171 , and the pivot shaft 101 . DETAILED DESCRIPTION

[0030] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0031] Centrifuges are widely used in the industrial field, mainly in centrifugal refrigeration compressors, air compressors, blowers and other high-speed rotating machinery. The common feature of these is that the impeller rotates at high speed to centrifugally compress the gas. While the impeller is compressing, due to the gap between the rotor and the stator, the gas in the impeller compressor will leak along the rotor and the stator, causing leakage losses and reducing the efficiency of the compressor.

[0032] Reference below Figure 1-Figure 3 A centrifuge according to an embodiment of the present invention is described.

[0033] According to the utility model, the centrifuge 1 includes a housing 11, a bearing protection portion 12, a volute 13 and an impeller 14, wherein a first cavity is formed in the housing 11; the bearing protection portion 12 is arranged on the housing 11 and is formed with a bearing cavity communicated with the first cavity, and a bearing for supporting a pivot shaft 101 is arranged in the bearing cavity; the volute 13 is arranged on the housing 11 and defines a second cavity between the volute 13 and the housing 11; the impeller 14 is connected to the pivot shaft 101 and is rotatably arranged on the volute 13, and a first channel 151 is formed between the impeller 14 and the housing 11 to communicate the second cavity with the bearing cavity; wherein a second channel 152 communicated with the bearing cavity is formed on the housing 11, and the second channel 152 is suitable for communicating with the outlet of the cooling device to input low-temperature gas into the bearing cavity.

[0034] According to the centrifuge 1 of the utility model, a housing 11 is provided, and a first cavity for accommodating various components of the centrifuge 1 is formed inside the housing 11. For example, the bearing protection part 12 of the centrifuge 1 can be arranged in the first cavity. The bearing protection part 12 is a structure for protecting the bearing of the centrifuge 1. A bearing cavity for accommodating the bearing is formed inside the bearing protection part 12. The bearing can be sleeved on the outer periphery of the pivot shaft 101 of the centrifuge 1 and used to support the rotation of the pivot shaft 101. The setting of the bearing protection part 12 can prevent the bearing from being directly affected by the external environment, such as dust, moisture or other pollutants, thereby extending the service life of the bearing. By integrating the bearing protection part 12 into the housing 11 and setting a connection relationship with the volute 13, the impeller 14 and other components, a compact design of the structure of the centrifuge 1 is achieved, which helps to reduce the volume of the centrifuge 1 and facilitates the installation and use of the centrifuge 1.

[0035] A volute 13 is also provided in the first cavity, and the volute 13 can define a second cavity in the first cavity, and the second cavity can be used to assemble the impeller 14 of the centrifuge 1, and the impeller 14 is connected to the pivot shaft 101 so as to rotate in the second cavity to realize the function of compressing gas in the centrifuge 1. When the impeller 14 is assembled in the volute 13, the high-pressure gas generated by the rotation and compression of the impeller 14 can flow in the first cavity formed by the volute 13 and can flow into other structures outside the centrifuge 1 through the volute 13. After the impeller 14 is assembled, a first channel 151 connecting the second cavity with the bearing cavity is formed between the impeller 14 and the housing 11. The first channel 151 here can be understood as a gap generated between the impeller 14 and the housing 11 when the impeller 14 is assembled. The gas leakage of the centrifuge 1 in the background technology can be understood as the gas compressed by the impeller 14 entering the bearing cavity and the motor cavity and other areas through the first channel 151. Therefore, the centrifuge 1 can be provided with a second channel 152 connected to the bearing cavity on the housing 11. The second channel 152 can introduce external high-pressure gas into the bearing cavity and offset the high-pressure gas flowing toward the bearing cavity in the first channel 151 to prevent the high-pressure gas generated by the impeller 14 from entering the bearing cavity through the first channel 151, thereby reducing the gas leakage loss of the centrifuge 1 and improving the efficiency of the centrifuge 1.

[0036] In addition, the second channel 152 can also be connected to the cooling device, and the cooling device can input low-temperature and high-pressure gas into the second channel 152. After the low-temperature and high-pressure gas enters the second channel 152, it can collide with the high-pressure gas flowing toward the bearing cavity in the first channel 151, thereby preventing the high-temperature gas from leaking into the motor cavity. At the same time, the low-temperature and high-pressure gas can flow into the motor cavity through the bearing cavity and cool the electrical components in the motor cavity, thereby increasing the service life of the electrical components in the motor cavity.

[0037] In some embodiments, the inlet of the cooling device can be connected to the second cavity, that is, the high-temperature and high-pressure gas in the second cavity can directly enter the cooling device to cool down and form low-temperature and high-pressure gas.

[0038] It should be noted that, preferably, the pressure of the high-pressure gas introduced from the outside into the second channel 152 is consistent with the pressure of the gas in the first cavity.

[0039] According to one embodiment of the utility model, a first flow blocker 161 is formed in the first channel 151. In the centrifuge 1, the gap between the impeller 14 and the housing 11, i.e., the first channel 151, is a leakage source of the centrifuge 1. The provision of the first flow blocker 161 can reduce the leakage of gas from the second cavity to the bearing cavity, and can further improve the efficiency of the centrifuge 1.

[0040] According to an embodiment of the present invention, the impeller 14 is formed with a first wall 141 facing the housing 11, the housing 11 is formed with a second wall 1132 directly opposite to the first wall 141, and a first channel 151 is formed between the first wall 141 and the second wall 1132; wherein a protruding first flow blocking member 161 is formed on at least one of the first wall 141 and the second wall 1132. Figure 1 and Figure 2 As shown, a first wall 141 is processed on the side of the impeller 14 facing the housing 11. Here, the side facing the housing 11 can be understood as the wheel back of the impeller 14, and the housing 11 defines a second wall 1132 at a position directly opposite to the first wall 141. During actual processing, the first flow blocker 161 can be arranged on the first wall 141 or the second wall 1132, or the first flow blocker 161 can be arranged on both the first wall 141 and the second wall 1132. The specific details can be determined according to actual needs. By arranging the protruding first flow blocker 161 on the first wall 141 and / or the second wall 1132, the first channel 151 can be sealed, reducing the gas flowing from the first cavity to the first channel 151, which can effectively reduce gas leakage and improve the efficiency of the centrifuge 1.

[0041] According to one embodiment of the utility model, a first sealing tooth 1611 is formed on the first wall 141, and a second sealing tooth 1612 is formed on the second wall 1132. The first sealing tooth 1611 and the second sealing tooth 1612 are respectively constructed as a plurality of teeth staggered in the extension direction of the first channel 151, and the first sealing tooth 1611 and the second sealing tooth 1612 are constructed as the first baffle 161.

[0042] The first baffle 161 is a key structure in the first channel 151 for reducing gas leakage. During processing, the first baffle 161 may include a plurality of first sealing teeth 1611 and a plurality of second sealing teeth 1612, wherein the first sealing teeth 1611 may be arranged on the first wall 141 and protrude toward the second wall 1132, and the second sealing teeth 1612 may be arranged on the second wall 1132 and protrude toward the first wall 141. When the impeller 14 is assembled, the first sealing teeth 1611 and the second sealing teeth 1612 are staggered with each other in the extension direction of the first channel 151 and may mesh with each other. The meshed first sealing teeth 1611 and the second sealing teeth 1612 reduce the width of the first channel 151, extend the path of the gas flowing in the first channel 151 and increase the resistance to the gas flow, which can effectively reduce the loss of the gas in the first cavity from the first channel 151, thereby ensuring the efficiency of the centrifuge 1.

[0043] According to an embodiment of the present invention, the centrifuge 1 further comprises: a thrust portion 17 , which is arranged on a side of the bearing protection portion 12 away from the impeller 14 , a third channel 153 is formed between the thrust portion 17 and the bearing protection portion 12 , and a second flow blocking member 162 is formed in the third channel 153 .

[0044] A thrust portion 17 is also provided on the side of the bearing protection portion 12 away from the impeller 14. The thrust portion 17 is sleeved on the outer periphery of the pivot shaft 101 and forms a third channel 153 with the bearing protection portion 12. The gas entering the bearing cavity can flow into the motor cavity and other areas through the second channel 152. The third channel 153 here can also be understood as a part of the gas leakage path in the background technology, which is formed due to the assembly gap between multiple necessary structures. Therefore, the centrifuge 1 is provided with a second baffle 162 in the third channel 153. The second baffle 162 can seal the third channel 153 to reduce the gas entering the third channel 153 through the bearing cavity. After the second baffle 162 is provided, when high-pressure gas is introduced from the outside into the second channel 152, the high-pressure gas will not leak directly through the third channel 153, but can collide with the gas from the first cavity in the first channel 151 in the bearing cavity, thereby ensuring the sealing effect of the high-pressure gas introduced by the second channel 152 on the first channel 151, reducing the gas that eventually enters the motor cavity and other areas, and effectively reducing the gas leakage loss of the centrifuge 1.

[0045] According to an embodiment of the utility model, the bearing protection portion 12 is formed with a third wall 121, the thrust portion 17 is formed with a fourth wall 171 facing the third wall 121, and at least one of the third wall 121 and the fourth wall 171 is formed with a protruding second flow blocker 162. Similar to the arrangement of the first channel 151, the centrifuge 1 can define a third wall 121 on the bearing protection portion 12, and at the same time, the thrust portion 17 can define a fourth wall 171 on the side facing the third wall 121, the third wall 121 and the fourth wall 171 face each other and jointly define a third channel 153, and the second flow blocker 162 can be arranged on the third wall 121 or the fourth wall 171, or the second flow blocker 162 can be arranged on both the third wall 121 and the fourth wall 171. Figure 2 As shown, taking the second baffle 162 arranged on the third wall 121 as an example, the second baffle 162 can be constructed as a plurality of baffles arranged at intervals in the extension direction of the third wall 121 and protruding toward the fourth wall 171. The arrangement of the plurality of baffles extends the flow path of the gas in the third channel 153 and increases the resistance to the gas flow, which can effectively reduce the gas leakage of the third channel 153 and improve the efficiency of the centrifuge 1.

[0046] According to one embodiment of the utility model, a heat-insulating cavity 1122 is formed on the housing 11, and the heat-insulating cavity 1122 is located on the side of the second channel 152 close to the volute 13. Since the second channel 152 is located adjacent to the first cavity in the volute 13, and the first cavity contains high-temperature and high-pressure gas generated by the operation of the impeller 14, the centrifuge 1 is also provided with a heat-insulating cavity 1122 on the housing 11, and the heat-insulating cavity 1122 is arranged between the second channel 152 and the volute 13. The heat-insulating cavity 1122 can reduce the heat transferred from the second cavity to the second channel 152, and avoid the gas in the second channel 152 from being heated and causing the temperature of the gas flowing into the motor cavity to increase and damage the structure in the motor cavity, thereby improving the safety of the centrifuge 1. In addition, a heat-insulating medium can be provided in the heat-insulating cavity 1122 to further reduce the influence of the high-temperature gas in the second cavity on the high-pressure gas introduced into the second channel 152.

[0047] According to one embodiment of the utility model, the shell 11 includes a shell body 111, a diffuser 112 and a sealing portion 113, a first cavity is formed in the shell body 111, and the bearing protection portion 12 is connected to the shell body 111; the diffuser 112 is arranged on the shell body 111 and a volute 13 is arranged on the other side of the diffuser 112, a first radial channel 1121 and a heat insulation cavity 1122 are formed in the diffuser 112, and a connecting hole for the pivot shaft 101 to pass through is formed on the diffuser 112; the sealing portion 113 is arranged in the connecting hole and the sealing portion 113 is sleeved on the outer periphery of the pivot shaft 101, a second radial channel 1131 connected to the first radial channel 1121 is formed on the sealing portion 113, and the first radial channel 1121 and the second radial channel 1131 are configured as a second channel 152, and a first channel 151 is formed between the sealing portion 113 and the impeller 14.

[0048] Specifically, the shell 11 includes a shell body 111, a diffuser 112 and a sealing portion 113, wherein the shell body 111 is the outer shell of the centrifuge 1, which can protect the internal structure of the centrifuge 1 from being affected by the external environment. A first cavity is formed in the shell body 111, and the first cavity can be used to assemble various components of the centrifuge 1; the diffuser 112 can be arranged on the shell body 111, and the diffuser 112 can convert the dynamic pressure in the centrifuge 1 into static pressure. A connecting hole for the pivot shaft 101 to pass through is arranged at the center of the diffuser 112, and the pivot shaft 101 can cooperate with the impeller 14 after passing through the connecting hole; the sealing portion 113 is arranged in the connecting hole and is sleeved on the outer periphery of the pivot shaft 101. The arrangement of the pivot shaft 101, the sealing portion 113 and the diffuser 112 improves the compactness of the structure of the centrifuge 1. During processing, the diffuser 112 and the sealing portion 113 may be provided with a first radial channel 1121 and a second radial channel 1131 extending in the radial direction, respectively. After the diffuser 112 and the sealing portion 113 are assembled, the first radial channel 1121 and the second radial channel 1131 are connected to each other to form a complete second channel 152. The arrangement of the second channel 152 facilitates the disassembly, assembly and maintenance of the centrifuge 1.

[0049] According to an embodiment of the utility model, a first positioning portion is formed on the diffuser 112, and a second positioning portion is formed on the sealing portion 113. The first positioning portion cooperates with the second positioning portion to be suitable for positioning the first radial channel 1121 and the second radial channel 1131. Since the second channel 152 is formed by the cooperation of the sealing portion 113 and the diffuser 112, the centrifuge 1 can be provided with the first positioning portion and the second positioning portion on the diffuser 112 and the sealing portion 113, respectively. During assembly, the centrifuge 1 can achieve rapid and accurate assembly between the diffuser 112 and the sealing portion 113 through the cooperation of the first positioning portion and the second positioning portion. The provision of the first positioning portion and the second positioning portion can improve the assembly efficiency of the centrifuge 1.

[0050] The air conditioning system according to the utility model is briefly described below.

[0051] The air conditioning system according to the utility model includes an intercooler and the centrifuge 1 in the above embodiment, wherein the inlet of the intercooler is connected to the exhaust port of the second cavity, and at least one outlet of the intercooler is connected to the second channel 152. After the intercooler is assembled with the centrifuge 1, when the centrifuge 1 is working, the impeller 14 rotates to generate high-temperature and high-pressure gas, and the high-temperature and high-pressure gas can enter the intercooler through the second cavity and then be converted into low-temperature and high-pressure gas. At this time, a part of the low-temperature and high-pressure gas can flow back to the bearing cavity through the second channel 152 and collide with the high-temperature and high-pressure gas leaked in the first channel 151, so as to avoid the high-temperature and high-pressure gas from entering the bearing cavity, reduce the gas leakage loss of the centrifuge 1, improve the efficiency of the centrifuge 1, and thus improve the efficiency of the air conditioning system. In addition, a part of the low-temperature and high-pressure gas in the bearing cavity can leak into the motor cavity through the third channel 153 and cool the structure in the motor cavity, which can ensure the safety of the centrifuge 1 and improve the service life of the air conditioning system.

[0052] In summary, the centrifuge 1 is provided with a housing body 111 as the outer shell of the entire centrifuge 1 and a first cavity is defined in the housing body 111 for assembling structural components such as the pivot shaft 101 of the centrifuge 1. A diffuser 112 is provided on the housing body 111. A connecting hole for supporting the pivot shaft 101 is formed at the center of the diffuser 112, and a sealing portion 113 sleeved on the outer periphery of the pivot shaft 101 is accommodated in the connecting hole. A volute 13 is provided on one side of the sealing portion 113, and an impeller 14 connected to the pivot shaft 101 and a second cavity for accommodating high-temperature and high-pressure gas generated by the operation of the impeller 14 are rotatably arranged in the volute 13; a thrust portion 17 sleeved on the outer periphery of the pivot shaft 101 is provided on the other side of the sealing portion 113. Such a setting improves the compactness of the structure of the centrifuge 1, can reduce the volume of the centrifuge 1, and facilitates the assembly of the centrifuge 1. A first channel 151 connected to the second cavity is formed between the impeller 14 and the sealing portion 113; a third channel 153 connecting the second channel 152 with the motor cavity is formed between the sealing portion 113 and the thrust portion 17; a second channel 152 connected to the intercooler and respectively connected to the first channel 151 and the third channel 153 is formed between the sealing portion 113 and the diffuser 112. Among them, a first baffle 161 is arranged in the first channel 151, and a second baffle 162 is arranged in the third channel 153. The first baffle 161 and the second baffle 162 can reduce the gas leakage loss of the centrifuge 1, and the second channel 152 can introduce the low-temperature and high-pressure gas in the intercooler and offset the high-temperature and high-pressure gas leaking from the first channel 151. After the low-temperature and high-pressure gas enters the centrifuge 1 through the second channel 152, due to the obstruction of the second baffle 162, the low-temperature and high-pressure gas will not directly enter the motor cavity through the third channel 153, but will remain in the bearing cavity. At this time, the pressure in the bearing cavity is close to the pressure of the high-pressure gas leaking from the first channel 151. Therefore, the air pressure between the second cavity and the bearing cavity is balanced, and the high-temperature and high-pressure gas in the second cavity is difficult to leak through the first channel 151, further reducing the gas leakage of the centrifuge 1 while preventing the high-temperature gas from entering the motor cavity, thereby improving the efficiency and service life of the centrifuge 1.

[0053] In some embodiments, the cross-sections of the first sealing teeth 1611 and the second sealing teeth 1612 in the radial direction may be configured as complementary right-angle trapezoids, which may improve the structural strength of the first channel 151 .

[0054] Description of the drawings: Figure 3 The arrows shown in FIG. 1 only represent the flow direction of the gas introduced into the second passage 152 .

[0055] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0056] In the description of the present invention, "first feature" or "second feature" may include one or more of the features.

[0057] In the description of the present invention, "plurality" means two or more.

[0058] In the description of the present invention, a first feature being “above” or “below” a second feature may include that the first and second features are directly in contact with each other, or may include that the first and second features are not in direct contact but are in contact with each other via another feature therebetween.

[0059] In the description of the present invention, a first feature “above”, “over” and “above” a second feature includes the first feature being directly above and obliquely above the second feature, or simply means that the first feature is horizontally higher than the second feature.

[0060] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0061] Although the embodiments of the present invention have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A centrifuge, characterized in that: include: A housing (11), wherein a first cavity is formed in the housing (11); a bearing protection portion (12), the bearing protection portion (12) being arranged on the housing (11) and forming a bearing cavity communicating with the first cavity, wherein a bearing for supporting the pivot shaft (101) is arranged in the bearing cavity; a volute (13), the volute (13) being disposed on the housing (11) and defining a second cavity between the volute (13) and the housing (11); an impeller (14), the impeller (14) being connected to the pivot shaft (101) and rotatably disposed on the volute (13), and a first passage (151) for connecting the second cavity with the bearing cavity being formed between the impeller (14) and the housing (11); A second channel (152) communicating with the bearing cavity is formed on the housing (11), and the second channel (152) is suitable for communicating with an outlet of a cooling device so as to input low-temperature gas into the bearing cavity.

2. The centrifuge (1) according to claim 1, characterized in that A first flow blocking member (161) is formed in the first channel (151).

3. The centrifuge (1) according to claim 2, characterized in that The impeller (14) is formed with a first wall (141) facing the housing (11), the housing (11) is formed with a second wall (1132) directly opposite to the first wall (141), and the first channel (151) is formed between the first wall (141) and the second wall (1132); wherein A protruding first flow blocking member (161) is formed on at least one of the first wall (141) and the second wall (1132).

4. The centrifuge (1) according to claim 3, characterized in that The first wall (141) is formed with a first sealing tooth (1611), and the second wall (1132) is formed with a second sealing tooth (1612), the first sealing tooth (1611) and the second sealing tooth (1612) are respectively configured as a plurality of teeth alternately arranged in an extension direction of the first channel (151), and the first sealing tooth (1611) and the second sealing tooth (1612) are configured as the first flow blocking member (161).

5. The centrifuge (1) according to claim 2, characterized in that Also includes: A thrust portion (17), the thrust portion (17) being arranged on a side of the bearing protection portion (12) away from the impeller (14), a third channel (153) being formed between the thrust portion (17) and the bearing protection portion (12), and a second flow blocking member (162) being formed in the third channel (153).

6. The centrifuge (1) according to claim 5, characterized in that The bearing protection portion (12) is formed with a third wall (121), the thrust portion (17) is formed with a fourth wall (171) directly opposite to the third wall (121), and at least one of the third wall (121) and the fourth wall (171) is formed with a protruding second flow blocking member (162).

7. The centrifuge (1) according to claim 1, characterized in that A heat-insulating cavity (1122) is formed on the shell (11), and the heat-insulating cavity (1122) is located on a side of the second passage (152) close to the volute (13).

8. The centrifuge (1) according to claim 7, characterized in that The housing (11) comprises: A housing body (111), wherein a first cavity is formed in the housing body (111), and the bearing protection portion (12) is connected to the housing body (111); a diffuser (112), the diffuser (112) being arranged on the housing body (111) and the volute (13) being arranged on the other side of the diffuser (112), a first radial channel (1121) and the heat-insulating cavity (1122) being formed in the diffuser (112), and a connecting hole for the pivot shaft (101) to pass through being formed on the diffuser (112); A sealing portion (113), wherein the sealing portion (113) is arranged in the communicating hole and the sealing portion (113) is sleeved on the outer periphery of the pivot shaft (101), a second radial channel (1131) communicating with the first radial channel (1121) is formed on the sealing portion (113), and the first radial channel (1121) and the second radial channel (1131) are configured to form the second channel (152), and the first channel (151) is formed between the sealing portion (113) and the impeller (14).

9. The centrifuge (1) according to claim 8, characterized in that A first positioning portion is formed on the diffuser (112), and a second positioning portion is formed on the sealing portion (113), wherein the first positioning portion cooperates with the second positioning portion to be suitable for positioning the first radial channel (1121) and the second radial channel (1131).

10. An air conditioning system, characterized in that: include: A centrifuge (1), wherein the centrifuge (1) is configured as the centrifuge (1) according to any one of claims 1 to 9; An intercooler, wherein the inlet of the intercooler is in communication with the second cavity, and the outlet of the intercooler is in communication with the second channel (152).

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