Water vapor compressor and water vapor compression system

Abstract

The utility model provides a water vapor compressor and a water vapor compression system. The water vapor compressor includes: a drive shaft; the first impeller is connected with the first end of the driving shaft; the first end of the driving shaft is at least partially sleeved with the first sealing piece, and the first sealing piece is in sealing fit with the driving shaft; the second sealing piece is arranged on the first sealing piece in a sleeving mode and fixedly connected with the first sealing piece, and the second sealing piece is in sealing fit with the first impeller; a first cavity is formed in the surface of the side, close to the driving shaft, of the first sealing piece, the first sealing piece is further provided with a first exhaust channel and a first inflation channel which are communicated with the first cavity, and the first inflation channel is located on the side, away from the first impeller, of the first cavity in the axial direction of the driving shaft. According to the embodiment of the invention, water vapor leakage can be blocked for four times, so that the working safety and reliability of the water vapor compressor can be improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of compressors, in particular to a water vapor compressor and a water vapor compression system. BACKGROUND

[0002] The steam required by an industrial scene has a higher temperature requirement, far exceeding the temperature that can be provided by a conventional heat pump system, such as 120-200℃. A water vapor compressor can raise the temperature and pressure of low-pressure water vapor, thereby outputting high-pressure steam.

[0003] In a related art steam compressor, steam can leak towards the inside of the compressor, causing the internal live parts to fail, short circuit, and the like, thereby affecting the safety and reliability of the operation of the compressor. CONTENT OF THE UTILITY MODEL

[0004] Embodiments of the present application provide a water vapor compressor and a water vapor compression system, aiming to improve the problem of low safety and reliability of the operation of the water vapor compressor.

[0005] In a first aspect, the present application provides a water vapor compressor. The water vapor compressor comprises: a drive shaft; a first impeller connected to a first end of the drive shaft; a first sealing member at least partially sleeved on the first end of the drive shaft, the first sealing member being in sealing cooperation with the drive shaft; a second sealing member sleeved on the first sealing member and fixedly connected with the first sealing member, the second sealing member being in sealing cooperation with the first impeller; a first cavity is arranged on a side surface of the first sealing member close to the drive shaft, the first sealing member further comprises a first exhaust passage and a first air charging passage in communication with the first cavity, and the first air charging passage is located on a side of the first cavity away from the first impeller in the axial direction of the drive shaft.

[0006] Embodiments of the present application can achieve four times of blocking of water vapor leakage, thereby effectively improving or even eliminating the problem of water vapor leakage into the inside of the water vapor compressor, and thereby facilitating to improve the safety and reliability of the operation of the water vapor compressor.

[0007] In some embodiments, the first sealing member comprises a first sealing base and a plurality of first sealing parts; the first sealing base is provided with a first mounting part and a second mounting part on a side surface close to the drive shaft, the first mounting part is located between the second mounting part and the first impeller in the axial direction of the drive shaft, part of the first sealing parts in the plurality of first sealing parts are arranged on the first mounting part, and another part of the first sealing parts in the plurality of first sealing parts are arranged on the second mounting part.

[0008] In some embodiments, the first cavity is arranged in the first sealing base and located between the first mounting portion and the second mounting portion, the first gas charging passage extends in a radial direction of the drive shaft and penetrates to the second mounting portion, and the first gas discharging passage extends in the radial direction of the drive shaft and penetrates to the first cavity.

[0009] In some embodiments, the first gas charging passage extends in the radial direction of the drive shaft and has a first distance from the first cavity in an axial direction of the drive shaft, the first distance is greater than or equal to 10 mm and less than or equal to 15 mm.

[0010] In some embodiments, a first gap is arranged between the second sealing member and the first impeller, and a first labyrinth sealing structure is arranged in the first gap.

[0011] In some embodiments, the drive shaft is provided with a first shaft shoulder and a first mating surface, the first impeller is provided with a first accommodation groove on a side surface close to the drive shaft, a bottom wall of the first accommodation groove is flush with the first mating surface, and the first sealing member is located between the first accommodation groove and the first shaft shoulder.

[0012] In some embodiments, the drive shaft is provided with a second shaft shoulder and a second mating surface, the second shaft shoulder is located on a side of the first shaft shoulder away from the first impeller, the second mating surface is located between the first shaft shoulder and the second shaft shoulder, the water vapor compressor further comprises a first protection bearing and a first protection bearing seat connected with the first protection bearing, the first protection bearing is sleeved on the second mating surface, and the second sealing member is fixedly connected with the first protection bearing seat.

[0013] In some embodiments, the drive shaft is provided with a first mating portion, the first impeller is provided with a second mating portion inserted with the first mating portion, the water vapor compressor further comprises a first pull rod for connecting the drive shaft and the first impeller, one of the first mating portion and the second mating portion is a mounting hole, and the other of the first mating portion and the second mating portion is a triangular shaft.

[0014] In some embodiments, the second seal is provided with a second air inlet channel in communication with the first air inlet channel and a second air outlet channel in communication with the first air outlet channel, and the water vapor compressor further comprises: a housing provided with a third air inlet channel for communication with an external air source; a first pressure expansion assembly sleeved on the second seal and fixedly connected with the housing, the second air outlet channel extending along a radial direction of the drive shaft and penetrating through the first pressure expansion assembly; and a first air inlet pipe, one end of which is connected with the second air inlet channel and the other end of which is connected with the third air inlet channel at a side close to the second seal.

[0015] In some embodiments, the water vapor compressor further comprises: a second impeller connected with the second end of the drive shaft; a third seal at least partially sleeved on the second end of the drive shaft, the third seal being in sealing cooperation with the drive shaft; a fourth seal sleeved on the third seal and fixedly connected with the third seal, the fourth seal being in sealing cooperation with the second impeller; the third seal is provided with a second cavity at a side surface close to the drive shaft, the third seal is further provided with a third air outlet channel and a fourth air inlet channel in communication with the second cavity, and the fourth air inlet channel is located at a side of the second cavity away from the second impeller along an axial direction of the drive shaft.

[0016] In some embodiments, the third seal comprises a second seal base and a plurality of second seal portions; the second seal base is provided with a third mounting portion and a fourth mounting portion at a side surface close to the drive shaft, the third mounting portion is located between the fourth mounting portion and the second impeller along an axial direction of the drive shaft, part of the second seal portions are arranged at the third mounting portion, and another part of the second seal portions are arranged at the fourth mounting portion.

[0017] In some embodiments, the second cavity is arranged at the second seal base and located between the third mounting portion and the fourth mounting portion, the fourth air inlet channel extends along a radial direction of the drive shaft and penetrates to the fourth mounting portion, and the third air outlet channel extends along the radial direction of the drive shaft and penetrates to the second cavity.

[0018] In some embodiments, the fourth air inlet channel extends along a radial direction of the drive shaft, and a second distance between the fourth air inlet channel and the second cavity is greater than or equal to 10 mm and less than or equal to 15 mm.

[0019] In some embodiments, a second labyrinth seal structure is arranged in a second gap between the fourth seal and the second impeller.

[0020] In some embodiments, the fourth seal is provided with a fifth charging passage in communication with the fourth charging passage and a fourth discharging passage in communication with the third discharging passage, the water vapor compressor further comprises: a housing provided with a sixth charging passage for communication with an external air source; a second pressure expansion assembly sleeved on the fourth seal and fixedly connected with the housing, the fourth discharging passage extends along the radial direction of the driving shaft and penetrates through the second pressure expansion assembly; and a second charging pipe, one end of the second charging pipe is connected with the fifth charging passage, and the other end is connected with the sixth charging passage on the side close to the fourth seal.

[0021] In some embodiments, the water vapor compressor comprises: a stator winding located between the first impeller and the second impeller; a magnetic steel assembly fixedly connected with the driving shaft and magnetically coupled with the stator winding; and an axial magnetic bearing assembly sleeved on the driving shaft, the axial magnetic bearing assembly is located between the stator winding and the second impeller.

[0022] In a second aspect, the present application provides a water vapor compression system comprising the water vapor compressor of the first aspect. BRIEF DESCRIPTION OF DRAWINGS

[0023] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments or prior art description will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor on the basis of these drawings.

[0024] Figure 1 The cross-sectional structure schematic diagram of the water vapor compressor provided by an embodiment of the present application is shown in the figure.

[0025] Figure 2 The local structure schematic diagram in the figure is shown in the figure. Figure 1

[0026] Figure 3 The enlarged structure schematic diagram of M in the figure is shown in the figure. Figure 2

[0027] Figure 4 The local structure schematic diagram in the figure is shown in the figure. Figure 1

[0028] Figure 5 The enlarged structure schematic diagram of N in the figure is shown in the figure. Figure 4

[0029] Figure 6 The structure schematic diagram of the water vapor compression system provided by an embodiment of the present application is shown in the figure. ​​​​

[0030] Reference Signs List:

[0031] 1 - water vapor compression system;

[0032] 10 - water vapor compressor, 10a - first compression part, 10b - second compression part, 10c - inter-stage cooling pipeline, 11 - first buffer tank, 12 - second buffer tank, 13 - third buffer tank, 14 - first flush device, 15 - second flush device;

[0033] 100 - driving shaft, 110 - first shaft shoulder, 120 - first mating surface, 130 - second shaft shoulder, 140 - second mating surface, 150 - first mating part, 160 - third shaft shoulder, 170 - third mating surface, 180 - fourth shaft shoulder, 190 - fourth mating surface;

[0034] 200 - first impeller, 201 - first accommodation groove, 210 - second mating part, 220 - first pull rod;

[0035] 300 - first sealing element, 301 - first cavity, 302 - first exhaust passage, 303 - first gas charging passage, 304 - first mounting part, 305 - second mounting part, 306 - collar, 307 - anti-rotation pin, 310 - first sealing base body, 320 - first sealing part;

[0036] 400 - second sealing element, 401 - second gas charging passage, 402 - second exhaust passage, 410 - first labyrinth sealing structure;

[0037] 500 - first protection bearing, 510 - first protection bearing seat, 520 - outer shell, 521 - third gas charging passage, 522 - sixth gas charging passage, 523 - cooling flow channel, 524 - ventilation opening, 530 - first diffuser assembly, 531 - first diffuser, 532 - first volute, 540 - first gas charging pipe, 550 - second protection bearing, 560 - second protection bearing seat, 570 - shaft sleeve, 580 - second diffuser assembly, 581 - second diffuser, 582 - second volute, 590 - second gas charging pipe;

[0038] 600 - second impeller, 601 - second accommodation groove;

[0039] 700 - third sealing element, 701 - second cavity, 702 - third exhaust passage, 703 - fourth gas charging passage, 704 - third mounting part, 705 - fourth mounting part, 710 - second sealing base body, 720 - second sealing part;

[0040] 800 - fourth sealing element, 801 - fifth gas charging passage, 802 - fourth exhaust passage, 810 - second labyrinth sealing structure;

[0041] 900-Stator winding, 910-Magnetic steel assembly, 920-Axial magnetic bearing assembly, 921-First axial magnetic bearing, 922-Second axial magnetic bearing, 930-First radial magnetic bearing, 940-Second radial magnetic bearing, 941-Silicon steel sheet, 950-Sensor detection ring, 960-Sensor target disk, 970-First sensor, 980-Second sensor, 990-Thrust disk. Detailed Implementation

[0042] The principles and features of this application are described below with reference to the accompanying drawings. The examples given are only for explaining this application and are not intended to limit the scope of this application.

[0043] like Figures 1 to 3 As shown, an embodiment of the first aspect of this application provides a steam compressor 10. The steam compressor 10 includes a drive shaft 100, a first impeller 200, a first seal 300, and a second seal 400. The first impeller 200 is connected to a first end of the drive shaft 100. At least a portion of the first seal 300 is sleeved on the first end of the drive shaft 100, and the first seal 300 is in a sealing fit with the drive shaft 100. The second seal 400 is sleeved on the first seal 300 and fixedly connected to the first seal 300, and the second seal 400 is in a sealing fit with the first impeller 200. A first cavity 301 is provided on the surface of the first seal 300 near the drive shaft 100. The first seal 300 also has a first exhaust passage 302 and a first inflation passage 303 communicating with the first cavity 301. Along the axial direction of the drive shaft 100, the first inflation passage 303 is located on the side of the first cavity 301 opposite to the first impeller 200.

[0044] The drive shaft 100 is the power component in the steam compressor 10. The first impeller 200 is connected to the first end of the drive shaft 100, so that the drive shaft 100 can drive the first impeller 200 to rotate, thereby compressing the steam. The side of the first impeller 200 where the blades are located is called the front side, and the side of the first impeller 200 away from the blades is called the back side. The back side of the first impeller 200 is close to the drive shaft 100.

[0045] The steam pressure in the first impeller 200 gradually increases. Under the action of centrifugal force, the steam leaks from the outer edge of the first impeller 200 toward the axial direction of the drive shaft 100. The leakage path of the steam is as follows: the steam first leaks from the edge of the first impeller 200 through the fitting gap to the back side of the first impeller 200 and between the second seal 400, then leaks along the radial direction of the drive shaft 100 to the drive shaft 100, and finally leaks along the axial direction through the surface gaps of the drive shaft 100 into the interior of the steam compressor 10, corroding the magnetic bearings, motor and other electrically charged components.

[0046] Thus, the application further provides a first seal 300 and a second seal 400. The first seal 300 is provided with a first cavity 301, a first exhaust passage 302 and a first gas charging passage 303 which are in communication with the first cavity 301. In the axial direction of the drive shaft 100, the first gas charging passage 303 is located on the side of the first cavity 301 which is away from the first impeller 200.

[0047] Firstly, the second seal 400 can first block the leakage of water vapor in the radial direction of the drive shaft 100 from the back side of the first impeller 200, thereby reducing the amount of water vapor leakage and reducing the pressure of the leaked water vapor. Then, the first seal 300 can secondly block the leakage of water vapor in the axial direction of the drive shaft 100, thereby reducing the amount of water vapor leakage and again reducing the pressure of the leaked water vapor. After that, part of the water vapor leaked into the first seal 300 will enter the first cavity 301, be discharged to the outside through the first exhaust passage 302, thereby thirdly reducing the amount of water vapor leakage. Finally, the first gas charging passage 303, which is located on the side of the first cavity 301 away from the first impeller 200, can be filled with high-pressure insulating gas. The high-pressure gas will be backwashed into the first cavity 301 along the surface gap of the drive shaft 100, and the leaked water vapor will be carried out to the outside along with the high-pressure gas through the first exhaust passage 302.

[0048] Based on the above process, the application can achieve four times of blocking of water vapor leakage, thereby effectively improving or even eliminating the problem of water vapor leakage into the water vapor compressor 10, and further improving the safety and reliability of the water vapor compressor 10.

[0049] In some embodiments, as shown in Figure 3 The first seal 300 includes a first seal base 310 and a plurality of first seal portions 320. The first seal base 310 is provided with a first mounting portion 304 and a second mounting portion 305 near the side surface of the drive shaft 100. In the axial direction of the drive shaft 100, the first mounting portion 304 is located between the second mounting portion 305 and the first impeller 200. Some of the plurality of first seal portions 320 are arranged on the first mounting portion 304, and the other first seal portions 320 are arranged on the second mounting portion 305.

[0050] The first sealing base 310 is a main part of the first seal 300, and provides support and installation basis for the whole sealing structure. The first installation part 304 and the second installation part 305 can be installation cavities for accommodating a plurality of first sealing parts 320, which can be carbon rings for example. In this embodiment, the plurality of first sealing parts 320 are divided into two groups, and are arranged in the first installation part 304 and the second installation part 305 respectively, so that the first seal 300 can form double sealing in the axial direction of the drive shaft 100, thereby facilitating further reduction of the probability of water vapor leakage into the water vapor compressor 10, and further improving the safety and reliability of the water vapor compressor 10.

[0051] As shown in Figure 3 some embodiments, the first cavity 301 is arranged on the first sealing base 310 and located between the first installation part 304 and the second installation part 305, the first gas charging channel 303 extends in the radial direction of the drive shaft 100 and penetrates to the second installation part 305, and the first gas discharging channel 302 extends in the radial direction of the drive shaft 100 and penetrates to the first cavity 301.

[0052] This embodiment proposes one of the ways of arranging the first cavity 301, the first gas discharging channel 302 and the first gas charging channel 303 on the first sealing base 310. Specifically, the first gas discharging channel 302 and the first cavity 301 are substantially on the same radial straight line, and when water vapor leaks from between the drive shaft 100 and the first seal 300, it will first enter the first cavity 301 and then be directly discharged to the outside from the first gas discharging channel 302 which penetrates the first cavity 301. Thus, it is beneficial to improve the smoothness of water vapor discharge and reduce the probability of water vapor continuing to leak towards the second installation part 305.

[0053] If water vapor continues to leak towards the second installation part 305, at this time, the high-pressure gas in the first gas charging channel 303 will first enter the second installation part 305, and then rush into the first cavity 301 in the direction from the second installation part 305 to the first installation part 304. The movement direction of the high-pressure gas is opposite to the leakage direction of the water vapor, and the pressure is greater than that of the leaked water vapor, so the high-pressure gas will carry the leaked water vapor into the first cavity 301 together, and then be discharged to the outside through the first gas discharging channel 302. Thus, it is beneficial to further reduce the probability of water vapor leakage into the water vapor compressor 10, and further improve the safety and reliability of the water vapor compressor 10. In addition, the first gas charging channel 303 directly penetrates to the second installation part 305, which can avoid arranging an independent first gas charging channel on the first sealing base 310, thereby further facilitating the manufacture of the first gas charging channel 303.

[0054] Optionally, as shown in Figure 3As shown, the first seal 300 and the second seal 400 are connected through the collar 306 and the anti-rotation pin 307, and are sealed through the sealing ring.

[0055] In some embodiments, the first gas-filled channel 303 extends along the radial direction of the drive shaft 100, and the distance D1 between the first gas-filled channel 303 and the first cavity 301 along the axial direction of the drive shaft 100 is greater than or equal to 10 mm and less than or equal to 15 mm.

[0056] If the first distance between the first gas-filled channel 303 and the first cavity 301 is less than 10 mm, the high-pressure gas in the first gas-filled channel 303 is insufficiently backwashed, which is likely to cause the high-pressure gas to leak to the inside of the water vapor compressor 10 with water vapor, resulting in poor sealing effect of the high-pressure gas. If the first distance between the first gas-filled channel 303 and the first cavity 301 is greater than 15 mm, on the one hand, the axial distance of the first seal 300 is increased, resulting in an excessively large axial size of the water vapor compressor 10; on the other hand, the pressure drop of the high-pressure gas is too large, and the pressure of the high-pressure gas entering the first cavity 301 is insufficient, which also results in poor sealing effect of the high-pressure gas. In the present embodiment, the first distance is set to be greater than or equal to 10 mm and less than or equal to 15 mm, which is conducive to improving the backwashing effect of the high-pressure gas and thus improving the sealing effect, and is also conducive to reducing the axial size of the water vapor compressor 10 and thus realizing the miniaturization design requirement of the water vapor compressor 10. Optionally, the first distance can be 10 mm, 11 mm, 12 mm, 13 mm, 14 mm, 15 mm, etc.

[0057] It should be noted that the distance between the first gas-filled channel 303 and the first cavity 301 is the distance between the central axis of the first gas-filled channel 303 and the central axis of the first cavity 301 along the axial direction of the drive shaft 100.

[0058] In some embodiments, as shown, the second seal 400 and the first impeller 200 have a first gap, and the first labyrinth seal structure 410 is arranged in the first gap. Figure 2

[0059] Since the first impeller 200 is a high-speed rotating component, the first gap can avoid interference between the second seal 400 and the first impeller 200. Further, the first labyrinth seal structure 410 is arranged in the first gap. For example, the first labyrinth seal structure 410 can be one of a comb structure, a zigzag labyrinth seal structure, a stepped labyrinth seal structure, and a honeycomb labyrinth seal structure. When the leaked water vapor passes through the first labyrinth seal structure 410, it is constantly expanded and contracted, resulting in a gradual decrease in pressure, and finally achieving a sealing effect. Thus, the sealing effect of the second seal 400 is improved. ​

[0060] In some embodiments, as shown in Figure 2 and Figure 3 The driving shaft 100 is provided with a first shaft shoulder 110 and a first matching surface 120 matched with the first sealing member 300, and the first impeller 200 is provided with a first accommodation recess 201 on the side surface close to the driving shaft 100, the bottom wall of the first accommodation recess 201 is flush with the first matching surface 120, and the first sealing member 300 is located between the first accommodation recess 201 and the first shaft shoulder 110. In this way, on the one hand, the first accommodation recess 201 can provide a space for arranging the first sealing member 300, thereby facilitating the reduction of the axial size of the water vapor compressor 10. On the other hand, the first sealing member 300 can be in close contact with the bottom wall of the first accommodation recess 201 and the first matching surface 120, thereby facilitating the improvement of the reliability of the sealing. On the third hand, the first accommodation recess 201 and the first shaft shoulder 110 can axially limit the first sealing member 300, thereby facilitating the improvement of the stability of the sealing of the first sealing member 300 and the convenience of the installation.

[0061] In some embodiments, as shown in Figure 2 and Figure 3 The driving shaft 100 is further provided with a second shaft shoulder 130 and a second matching surface 140, the second shaft shoulder 130 is located on the side of the first shaft shoulder 110 away from the first impeller 200, the second matching surface 140 is located between the first shaft shoulder 110 and the second shaft shoulder 130, the water vapor compressor 10 further comprises a first protection bearing 500 and a first protection bearing seat 510 connected with the first protection bearing 500, the first protection bearing 500 is sleeved on the second matching surface 140, and the second sealing member 400 is fixedly connected with the first protection bearing seat 510.

[0062] The first protection bearing 500 can realize the functions of backup and protection, that is, the first protection bearing 500 can absorb part of the axial force and the radial force, and at the same time, can protect the driving shaft 100 and reduce the damage to the shaft caused by various factors (such as vibration, impact, etc.). In this embodiment, by arranging the first protection bearing 500 and the first protection bearing seat 510, on the one hand, the reliability and stability of the operation of the water vapor compressor 10 can be further improved. On the other hand, the second sealing member 400 can be fixedly installed, thereby facilitating the improvement of the reliability and stability of the sealing of the second sealing member 400.

[0063] In some embodiments, as shown in Figure 2 and Figure 3As shown, the drive shaft 100 is provided with a first matching part 150, the first impeller 200 is provided with a second matching part 210 which is inserted into the first matching part 150, and the water vapor compressor 10 further comprises a first pull rod 220 which is used to connect the drive shaft 100 and the first impeller 200, one of the first matching part 150 and the second matching part 210 is a mounting hole, and the other is a triangular shaft. In this way, on the one hand, the relative position accuracy between the drive shaft 100 and the first impeller 200 can be ensured, and on the other hand, the reliability and efficiency of power transmission can be improved.

[0064] In some embodiments, as Figures 1 to 3 As shown, the second sealing member 400 is provided with a second charging passage 401 which is in communication with the first charging passage 303, and a second exhaust passage 402 which is in communication with the first exhaust passage 302, and the water vapor compressor 10 further comprises a shell 520, a first diffuser assembly 530 and a first charging pipe 540, the shell 520 is provided with a third charging passage 521 which is used to communicate with an external gas source, the first diffuser assembly 530 is sleeved on the second sealing member 400 and is fixedly connected with the shell 520, the second exhaust passage 402 extends along the radial direction of the drive shaft 100 and penetrates through the first diffuser assembly 530, and one end of the first charging pipe 540 is connected with the second charging passage 401, and the other end is connected with the third charging passage 521 which is close to one side of the second sealing member 400.

[0065] The embodiment proposes a specific passage design of charging and exhausting on the side of the first impeller 200. The shell 520 is a protective shell of the water vapor compressor 10, and the third charging passage 521 on the shell 520 is used to access an external high-pressure gas source. The first diffuser assembly 530 is sleeved on the second sealing member 400, and the first diffuser assembly 530 can be matched with the first impeller 200, so as to complete the entire compression process. The first diffuser assembly 530 comprises a first diffuser 531 and a first volute 532, and the medium-high pressure steam after being pressurized by the first impeller 200 enters the first volute 532 after passing through the first diffuser 531, and is discharged from the exhaust port of the first volute 532.

[0066] In the embodiment, the specific path of the high-pressure gas flow is that the gas of the external gas source enters the first charging passage 303 after sequentially passing through the third charging passage 521 of the shell 520, the first charging pipe 540 and the second charging passage 401, and the gas in the first charging passage 303 carries the leaked water vapor and is sequentially discharged to the outside through the first cavity 301, the first exhaust passage 302 and the second exhaust passage 402.

[0067] By penetrating the second exhaust passage 402 of the second seal 400 through the first diffuser assembly 530 in the radial direction, the smoothness of gas exhaust and the convenience of manufacturing the second exhaust passage 402 are facilitated. Furthermore, by using the first gas charging pipe 540 to connect the second gas charging passage 401 and the third gas charging passage 521, on the one hand, the space between the first diffuser assembly 530 and the first protective bearing seat 510 can be reasonably utilized, and on the other hand, the convenience of gas passage maintenance and overhaul is facilitated.

[0068] In some embodiments, as shown in Figs. 1-3, the water vapor compressor 10 further comprises a second impeller 600 connected to the second end of the driving shaft 100, a third seal 700 at least partially sleeved on the second end of the driving shaft 100 and in sealing cooperation with the driving shaft 100, and a fourth seal 800 sleeved on the third seal 700 and fixedly connected to the third seal 700, the fourth seal 800 being in sealing cooperation with the second impeller 600. The third seal 700 is provided with a second cavity 701 on the side surface close to the driving shaft 100, and is further provided with a third exhaust passage 702 and a fourth gas charging passage 703 in communication with the second cavity 701. In the axial direction of the driving shaft 100, the fourth gas charging passage 703 is located on the side of the second cavity 701 away from the second impeller 600. Figure 1 、 Figure 4 and Figure 5 In some embodiments, as shown in Figs. 1-3, the water vapor compressor 10 further comprises a second impeller 600 connected to the second end of the driving shaft 100, a third seal 700 at least partially sleeved on the second end of the driving shaft 100 and in sealing cooperation with the driving shaft 100, and a fourth seal 800 sleeved on the third seal 700 and fixedly connected to the third seal 700, the fourth seal 800 being in sealing cooperation with the second impeller 600. The third seal 700 is provided with a second cavity 701 on the side surface close to the driving shaft 100, and is further provided with a third exhaust passage 702 and a fourth gas charging passage 703 in communication with the second cavity 701. In the axial direction of the driving shaft 100, the fourth gas charging passage 703 is located on the side of the second cavity 701 away from the second impeller 600.

[0069] In the present embodiment, the water vapor compressor 10 further comprises the second impeller 600, and the second impeller 600 is connected to the second end of the driving shaft 100. That is, the water vapor compressor 10 of the present embodiment is a two-stage compressor. One of the first impeller 200 and the second impeller 600 can realize one-stage compression, and the other can realize two-stage compression, so as to finally obtain high-pressure steam meeting the requirements and improve the compression efficiency. Moreover, the first impeller 200 and the second impeller 600 are respectively located at the two ends of the driving shaft 100, and can balance a part of the axial force, thereby improving the reliability and stability of the water vapor compressor 10 in operation.

[0070] Further, the present embodiment is further provided with the third seal 700 and the fourth seal 800. The third seal 700 is provided with the second cavity 701, the third exhaust passage 702 and the fourth gas charging passage 703 in communication with the second cavity 701. In the axial direction of the driving shaft 100, the fourth gas charging passage 703 is located on the side of the second cavity 701 away from the second impeller 600. In this way, four barriers to the leakage of water vapor on the side of the second impeller 600 can be realized, thereby effectively improving or even eliminating the problem of water vapor leakage on the side of the second impeller 600 into the interior of the water vapor compressor 10, and further facilitating the safety and reliability of the water vapor compressor 10 in operation.

[0071] In some embodiments, as shown in Figure 4 and Figure 5 The third seal 700 includes a second seal base 710 and a plurality of second seal portions 720. The second seal base 710 is provided with a third mounting portion 704 and a fourth mounting portion 705 near a side surface of the drive shaft 100. The third mounting portion 704 is located between the fourth mounting portion 705 and the second impeller 600 in the axial direction of the drive shaft 100. Some of the plurality of second seal portions 720 are arranged in the third mounting portion 704, and the other second seal portions 720 are arranged in the fourth mounting portion 705.

[0072] The second seal base 710 is the main part of the third seal 700, which provides support and mounting basis for the entire sealing structure. The third mounting portion 704 and the fourth mounting portion 705 can be mounting cavities for accommodating the plurality of second seal portions 720, which can be carbon rings, for example. In this embodiment, the plurality of second seal portions 720 are divided into two groups and arranged in the third mounting portion 704 and the fourth mounting portion 705, respectively, so that the third seal 700 can form a double seal in the axial direction of the drive shaft 100, thereby facilitating further reducing the probability of water vapor leakage into the water vapor compressor 10, and further improving the safety and reliability of the water vapor compressor 10.

[0073] Further, as shown in Figure 4 and Figure 5 In some embodiments, the second cavity 701 is arranged in the second seal base 710 between the third mounting portion 704 and the fourth mounting portion 705. The fourth gas charging channel 703 extends in the radial direction of the drive shaft 100 and penetrates the fourth mounting portion 705. The third gas discharge channel 702 extends in the radial direction of the drive shaft 100 and penetrates the second cavity 701.

[0074] This embodiment proposes one of the ways of arranging the second cavity 701, the fourth gas charging channel 703, and the third gas discharge channel 702 on the second seal base 710. Specifically, the third gas discharge channel 702 and the second cavity 701 are approximately on the same radial line. When water vapor leaks from between the drive shaft 100 and the third seal 700, it will first enter the second cavity 701 and then be directly discharged to the outside from the third gas discharge channel 702 that penetrates the second cavity 701. Thus, it is conducive to improving the smoothness of water vapor discharge and reducing the probability of water vapor continuing to leak towards the fourth mounting portion 705.

[0075] If the water vapor continues to leak towards the fourth mounting portion 705, at this time, the high-pressure gas in the fourth gas charging channel 703 will first enter the fourth mounting portion 705, and then flow into the second cavity 701 in the direction from the fourth mounting portion 705 to the third mounting portion 704. The movement direction of the high-pressure gas is opposite to the leakage direction of the water vapor, and the pressure is greater than the pressure of the leaked water vapor, so the high-pressure gas will carry the leaked water vapor into the second cavity 701 together, and then be discharged to the outside through the third gas discharge channel 702. Therefore, it is beneficial to further reduce the probability of water vapor leaking into the water vapor compressor 10, and thus beneficial to further improve the safety and reliability of the water vapor compressor 10. In addition, the fourth gas charging channel 703 directly penetrates to the fourth mounting portion 705, which can avoid setting an independent fourth gas charging channel on the second sealing base 710, thereby also being beneficial to improve the convenience of manufacturing the fourth gas charging channel 703.

[0076] Optionally, the third sealing member 700 and the fourth sealing member 800 are connected through a ring and an anti-rotation pin to realize the fixation of the two, and at the same time, the two are also sealed through a sealing ring.

[0077] In some embodiments, the fourth gas charging channel 703 extends in the radial direction of the driving shaft 100, and the distance D2 between the fourth gas charging channel 703 and the second cavity 701 is greater than or equal to 10 mm and less than or equal to 15 mm.

[0078] In this way, it is beneficial to improve the effect of the high-pressure gas reverse flushing, thereby improving the sealing effect, and also beneficial to further reduce the axial size of the water vapor compressor 10, thereby facilitating the miniaturization design requirement of the water vapor compressor 10. Optionally, it can be 10 mm, 11 mm, 12 mm, 13 mm, 14 mm, 15 mm, etc.

[0079] It should be noted that the distance between the fourth gas charging channel 703 and the second cavity 701 is the distance between the central axis of the fourth gas charging channel 703 and the central axis of the second cavity 701 in the axial direction of the driving shaft 100.

[0080] In some embodiments, as shown in Figure 2 The second gap between the fourth sealing member 800 and the second impeller 600 is provided with a second labyrinth sealing structure 810. The second labyrinth sealing structure 810 can be one of a comb structure, a zigzag labyrinth sealing structure, a stepped labyrinth sealing structure, and a honeycomb labyrinth sealing structure. When the leaked water vapor passes through the second labyrinth sealing structure 810, it will continuously expand and contract, causing its pressure to gradually decrease, and eventually achieving a sealing effect. Therefore, it is beneficial to improve the sealing effect of the fourth sealing member 800.

[0081] In some embodiments, as shown inFigure 4 and Figure 5 As shown in FIG. 7, the drive shaft 100 is provided with a third shaft shoulder 160 and a third matching surface 170 matched with the third seal 700, the second impeller 600 is provided with a second displacement groove 601 on the side surface close to the drive shaft 100, the bottom wall of the second displacement groove 601 is flush with the third matching surface 170, and the third seal 700 is located between the second displacement groove 601 and the third shaft shoulder 160. In this way, in the first aspect, the second displacement groove 601 can provide a space for arranging the third seal 700, thereby facilitating the reduction of the axial size of the water vapor compressor 10. In the second aspect, the third seal 700 can be in close contact with the bottom wall of the second displacement groove 601 and the third matching surface 170, thereby facilitating the improvement of the reliability of the sealing. In the third aspect, the second displacement groove 601 and the third shaft shoulder 160 can axially limit the third seal 700, thereby facilitating the improvement of the stability of the sealing of the third seal 700 and the convenience of the installation.

[0082] In some embodiments, as shown in FIG. 8, the drive shaft 100 is further provided with a fourth shaft shoulder 180 and a fourth matching surface 190, the fourth shaft shoulder 180 is located on the side of the third shaft shoulder 160 away from the second impeller 600, the fourth matching surface 190 is located between the fourth shaft shoulder 180 and the third shaft shoulder 160, the water vapor compressor 10 further comprises a second protection bearing 550 and a second protection bearing seat 560 connected with the second protection bearing 550, the second protection bearing 550 is sleeved on the fourth matching surface 190, and the fourth seal 800 is fixedly connected with the second protection bearing seat 560. Figure 4 Figure 5 The second protection bearing 550 can realize the functions of backup and protection, that is, the second protection bearing 550 can absorb part of the axial force and the radial force, and can also protect the drive shaft 100 and reduce the damage to the shaft caused by various factors (such as vibration, impact, etc.). In this embodiment, by arranging the second protection bearing 550 and the second protection bearing seat 560, on the one hand, the reliability and stability of the operation of the water vapor compressor 10 are further improved. On the other hand, the fourth seal 800 can be installed and fixed, thereby facilitating the improvement of the reliability and stability of the sealing of the fourth seal 800. Optionally, the second protection bearing 550 can be sleeved on the drive shaft 100 through the shaft sleeve 570.

[0083] In some embodiments, the second impeller 600 can also be connected with the drive shaft 100 through the second pull rod, the mutually inserted mounting holes and the triangular shaft, thereby on the one hand, the relative position accuracy between the drive shaft 100 and the second impeller 600 can be ensured, and on the other hand, the reliability and efficiency of the power transmission are improved.

[0084] In some embodiments, as shown in FIG. 9, the drive shaft 100 is further provided with a fifth shaft shoulder 200 and a fifth matching surface 210 matched with the fifth seal 900, the fifth matching surface 210 is located between the fifth shaft shoulder 200 and the fourth shaft shoulder 180, the water vapor compressor 10 further comprises a third protection bearing 650 and a third protection bearing seat 660 connected with the third protection bearing 650, the third protection bearing 650 is sleeved on the fifth matching surface 210, and the fifth seal 900 is fixedly connected with the third protection bearing seat 660.

[0085] In some embodiments, as shown in FIG. 10, the drive shaft 100 is further provided with a sixth shaft shoulder 210 and a sixth matching surface 220 matched with the sixth seal 1000, the sixth matching surface 220 is located between the sixth shaft shoulder 210 and the fifth shaft shoulder 200, the water vapor compressor 10 further comprises a fourth protection bearing 750 and a fourth protection bearing seat 760 connected with the fourth protection bearing 750, the fourth protection bearing 750 is sleeved on the sixth matching surface 220, and the sixth seal 1000 is fixedly connected with the fourth protection bearing seat 760. Figure 1 ​、 Figure 4 and Figure 5 As shown in FIG. 8, the fourth seal 800 is provided with a fifth charging passage 801 communicating with the fourth charging passage 703 and a fourth discharging passage 802 communicating with the third discharging passage 702, the shell 520 is provided with a sixth charging passage 522 for communicating with an external gas source, and the water vapor compressor 10 further comprises a second diffuser assembly 580 and a second charging pipe 590. The second diffuser assembly 580 is sleeved on the fourth seal 800 and fixedly connected with the shell 520. The fourth discharging passage 802 extends in the radial direction of the drive shaft 100 and penetrates the second diffuser assembly 580. One end of the second charging pipe 590 is connected with the fifth charging passage 801, and the other end is connected with the sixth charging passage 522 near the side of the fourth seal 800.

[0086] The embodiment provides a specific passage design for charging and discharging on the side of the second impeller 600. The sixth charging passage 522 on the shell 520 is used to access an external high-pressure gas source. The second diffuser assembly 580 is sleeved on the fourth seal 800, and the second diffuser assembly 580 can be matched with the second impeller 600, thereby completing the entire compression process of the second impeller 600. The second diffuser assembly 580 comprises a second diffuser 581 and a second volute 582. The high-pressure steam after being pressurized by the second impeller 600 enters the second volute 582 after passing through the second diffuser 581, and is discharged from the exhaust port of the second volute 582.

[0087] In the embodiment, the fourth discharging passage 802 of the fourth seal 800 penetrates the second diffuser assembly 580 in the radial direction, thereby facilitating the smoothness of gas discharge and the convenience of manufacturing the fourth discharging passage 802. Furthermore, by using the second charging pipe 590 to connect the fifth charging passage 801 and the sixth charging passage 522, on the one hand, the space between the second diffuser assembly 580 and the second protective bearing seat 560 can be reasonably utilized, and on the other hand, the convenience of gas passage maintenance and repair is also facilitated.

[0088] In some embodiments, the water vapor compressor 10 further comprises a stator winding 900, a magnetic steel assembly 910, and an axial magnetic bearing assembly 920. The stator winding 900 is located between the first impeller 200 and the second impeller 600. The magnetic steel assembly 910 is fixedly connected with the drive shaft 100 and magnetically coupled with the stator winding 900. The axial magnetic bearing assembly 920 is sleeved on the drive shaft 100 and located between the stator winding 900 and the second impeller 600.

[0089] In this embodiment, the magnetic steel assembly 910 is fixedly connected with the driving shaft 100 and is magnetically coupled with the stator winding 900. After the stator winding 900 is energized, the magnetic coupling occurs between the stator winding 900 and the magnetic steel assembly 910, so as to drive the magnetic steel assembly 910 to rotate, and the magnetic steel assembly 910 drives the driving shaft 100 to rotate. The stator winding 900 is the stator of the motor, and the magnetic steel assembly 910 and the driving shaft 100 are the rotor of the motor.

[0090] Further, the axial magnetic bearing assembly 920 is further arranged between the stator winding 900 and the second impeller 600. Although the first impeller 200 and the second impeller 600 can offset a part of the axial force, the axial force cannot be completely offset due to different compression ratios of the first impeller 200 and the second impeller 600. In this embodiment, the axial magnetic bearing assembly 920 can offset the remaining axial force, thereby further improving the reliability and stability of the water vapor compressor 10.

[0091] Optionally, in some embodiments, as shown in Figure 4 the axial magnetic bearing assembly 920 includes a first axial magnetic bearing 921 and a second axial magnetic bearing 922, and the driving shaft 100 is further sleeved with a thrust disc 990, and the first axial magnetic bearing 921 and the second axial magnetic bearing 922 are located on opposite sides of the thrust disc 990. Therefore, the stability and reliability of the driving shaft 100 in operation can be further improved.

[0092] In some embodiments, the water vapor compressor 10 further includes a first radial magnetic bearing 930 and a second radial magnetic bearing 940. The first radial magnetic bearing 930 is magnetically coupled to the driving shaft 100 and is located between the stator winding 900 and the first impeller 200. The second radial magnetic bearing 940 is magnetically coupled to the driving shaft 100 and is located between the stator winding 900 and the axial magnetic bearing assembly 920. By arranging the first radial magnetic bearing 930 and the second radial magnetic bearing 940, the radial force generated by the first impeller 200 and the second impeller 600 can be balanced, thereby further improving the reliability and stability of the water vapor compressor 10 in operation. Optionally, the first radial magnetic bearing 930 and the second radial magnetic bearing 940 are provided with silicon steel sheets 941 between the driving shaft 100.

[0093] In some embodiments, as shown in Figure 1 the cooling flow channel 523 is used to connect an external cooling liquid circulation loop, and the ventilation opening 524 can be ventilated with cold air. Therefore, the water vapor compressor 10 can be cooled by water cooling and air cooling, thereby further improving the reliability and safety of the water vapor compressor 10 in operation.

[0094] In some embodiments, as shown in Figure 1 , Figure 2 , Figure 4 , a sensor detection ring 950 and a sensor target disc 960 are further sleeved on the drive shaft 100, and the water vapor compressor 10 further comprises a first sensor 970 coupled with the sensor detection ring 950 and a second sensor 980 coupled with the sensor target disc 960. By arranging the above components, the slight displacement of the drive shaft 100 in the radial and axial directions can be monitored in real time, and feedback is provided for the control system of the magnetic suspension bearing, thereby improving the reliability and service life of the water vapor compressor 10.

[0095] As shown in Figure 6 , the embodiments of the second aspect of the present application propose a water vapor compression system 1 comprising the water vapor compressor 10 of the first aspect. Thus, the safety and reliability of the water vapor compression system can be improved.

[0096] In some embodiments, as shown in Figure 6 and with reference to Figure 1 , the water vapor compressor 10 comprises a drive shaft 100, a first impeller 200 connected to a first end of the drive shaft 100, a first diffuser assembly 530 connected to the first impeller 200, a second impeller 600 connected to a second end of the drive shaft 100, and a second diffuser assembly 580 connected to the second impeller 600. The first impeller 200 and the first diffuser assembly 530 form a first compression part 10a, and the second impeller 600 and the second diffuser assembly 580 form a second compression part 10b. An inter-stage cooling pipeline 10c is arranged between the steam outlet of the first compression part 10a and the steam inlet of the second compression part 10b. The water vapor compression system 1 further comprises a first buffer tank 11, a second buffer tank 12, a third buffer tank 13, a first flushing device 14, and a second flushing device 15. The first buffer tank 11 is arranged at the steam inlet of the first compression part 10a and is used for gas-liquid separation and pressure stabilization of the inlet steam. The bottom of the first buffer tank 11 is arranged for water drainage. The first flushing device 14 is connected to the inter-stage cooling pipeline 10c and sprays water mist into the inter-stage cooling pipeline 10c. The spraying water has a filtration precision of ≤75 μm, and the flow and pressure of the spraying water are adjusted by an electric valve, so that the superheat degree of the steam outlet from the inter-stage cooling pipeline 10c is reduced. The second buffer tank 12 is arranged between the steam outlet of the inter-stage cooling pipeline 10c and the steam inlet of the second compression part 10b and is used for gas-liquid separation and pressure stabilization of the sprayed steam to prevent liquid from being carried by the steam to damage the second impeller 600. The second flushing device 15 is connected to the steam outlet of the second compression part 10b to spray the high-temperature and high-pressure superheated steam from the steam outlet of the second compression part 10b again to convert it into saturated steam. The third buffer tank 13 is used for gas-liquid separation and pressure stabilization of the saturated steam sprayed by the second flushing device 15, and the saturated steam is finally used by a client.

[0097] In the description of the present application, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the purpose of facilitating the description of the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0098] In addition, the terms "first", "second" are only for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined with "first", "second" can explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of "a plurality of" is at least two, for example, two, three, etc., unless otherwise explicitly specified and limited.

[0099] In the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connecting", "fixing" and the like should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise explicitly limited. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0100] In the present application, unless otherwise explicitly specified and limited, the first feature is "on" or "under" the second feature, which can be direct contact between the first and second features, or indirect contact between the first and second features through an intermediate medium. Moreover, the first feature "above", "above" and "above" the second feature can be directly above or obliquely above the first feature, or only indicate that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "below" and "below" the second feature can be directly below or obliquely below the first feature, or only indicate that the horizontal height of the first feature is less than that of the second feature.

[0101] In the description of the specification, the description of the terms "one embodiment", "some embodiments", "an example", "a specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are contained in at least one embodiment or example of the present application. In the specification, the illustrative description 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 appropriate manner in any one or more embodiments or examples. In addition, the person skilled in the art can combine and combine the different embodiments or examples described in the specification and the features of the different embodiments or examples without contradiction.

[0102] Although the embodiments of the present application have been shown and described above, it is understood that the above embodiments are exemplary and are not to be construed as limiting the present application, and the person skilled in the art can make changes, modifications, replacements and variations to the above embodiments within the scope of the present application.

Claims

1. A water vapor compressor characterized by, The water vapor compressor comprises a driving shaft, a first impeller connected with a first end of the driving shaft, a first sealing element at least partially sleeved on the first end of the driving shaft and in sealing fit with the driving shaft, and a second sealing element sleeved on the first sealing element and fixedly connected with the first sealing element, the second sealing element being in sealing fit with the first impeller. The first sealing element is provided with a first cavity on a side surface close to the driving shaft, and is further provided with a first exhaust passage and a first air charging passage in communication with the first cavity. The first sealing element comprises a first sealing base and a plurality of first sealing portions. The first sealing base is provided with a first mounting portion and a second mounting portion on a side surface close to the driving shaft. The first cavity is arranged on the first sealing base and between the first mounting portion and the second mounting portion. The first air charging passage extends in a radial direction of the driving shaft and penetrates through to the second mounting portion.

2. The water vapor compressor of claim 1, wherein, The first air charging passage extends in a radial direction of the driving shaft. The first air charging passage and the first cavity have a first distance therebetween in an axial direction of the driving shaft.

3. The water vapor compressor of claim 2, wherein, The first distance is greater than or equal to 10 mm and less than or equal to 15 mm.

4. The water vapor compressor of claim 1, wherein, The second sealing element and the first impeller have a first gap therebetween, and a first labyrinth sealing structure is arranged in the first gap. The driving shaft is provided with a first shaft shoulder and a first mating surface.

5. The water vapor compressor of claim 1, wherein, The first impeller is provided with a first recessed groove on a side surface close to the driving shaft.

6. The water vapor compressor of claim 1, wherein, The bottom wall of the first recessed groove is flush with the first mating surface. The driving shaft is provided with a second shaft shoulder and a second mating surface.

7. The water vapor compressor of claim 6, wherein, The second shaft shoulder is located on a side of the first shaft shoulder away from the first impeller. The second mating surface is located between the first shaft shoulder and the second shaft shoulder.

8. The water-vapour compressor of claim 1, wherein, The water vapor compressor further comprises a first protection bearing and a first protection bearing seat connected with the first protection bearing. The first protection bearing is sleeved on the second mating surface. The second sealing element is fixedly connected with the first protection bearing seat. The driving shaft is provided with a first mating portion, and the first impeller is provided with a second mating portion inserted with the first mating portion. The water vapor compressor further comprises a first pull rod for connecting the driving shaft and the first impeller. One of the first mating portion and the second mating portion is a mounting hole, and the other is a triangular shaft.

9. The water-vapour compressor of claim 1, wherein, The second seal is provided with a second air inlet channel communicated with the first air inlet channel and a second air outlet channel communicated with the first air outlet channel, and the water vapor compressor further comprises: The shell is provided with a third air inlet channel for communicating with an external air source; The first diffuser assembly is sleeved on the second seal and fixedly connected with the shell, and the second air outlet channel extends along the radial direction of the driving shaft and penetrates through the first diffuser assembly; The first air inlet pipe has one end connected with the second air inlet channel and the other end connected with the third air inlet channel on the side close to the second seal.

10. The water-vapour compressor of claim 1, wherein, The water vapor compressor further comprises: The second impeller is connected with the second end of the driving shaft; The third seal is at least partially sleeved on the second end of the driving shaft, and the third seal is in sealing cooperation with the driving shaft; The fourth seal is sleeved on the third seal and fixedly connected with the third seal, and the fourth seal is in sealing cooperation with the second impeller; The third seal is provided with a second cavity on the side surface close to the driving shaft, and the third seal is further provided with a third air outlet channel and a fourth air inlet channel communicated with the second cavity, and the fourth air inlet channel is located on the side of the second cavity away from the second impeller along the axial direction of the driving shaft.

11. The water vapor compressor of claim 10, wherein, The third seal comprises a second seal base and a plurality of second seal parts; The second seal base is provided with a third mounting part and a fourth mounting part on the side surface close to the driving shaft, and the third mounting part is located between the fourth mounting part and the second impeller along the axial direction of the driving shaft, and part of the second seal parts in the plurality of second seal parts are arranged on the third mounting part, and another part of the second seal parts in the plurality of second seal parts are arranged on the fourth mounting part.

12. The water vapor compressor of claim 11, wherein, The second cavity is arranged on the second seal base and located between the third mounting part and the fourth mounting part, the fourth air inlet channel extends along the radial direction of the driving shaft and penetrates to the fourth mounting part, and the third air outlet channel extends along the radial direction of the driving shaft and penetrates to the second cavity.

13. The water vapor compressor of claim 10, wherein, The fourth air inlet channel extends along the radial direction of the driving shaft; The fourth air inlet channel and the second cavity have a second distance therebetween, and the second distance is greater than or equal to 10 mm and less than or equal to 15 mm.

14. The water vapor compressor of claim 10, wherein, The second gap is arranged between the fourth seal and the second impeller, and a second labyrinth seal structure is arranged in the second gap.

15. The water vapor compressor of claim 10, wherein, The fourth seal is provided with a fifth air inlet channel communicated with the fourth air inlet channel and a fourth air outlet channel communicated with the third air outlet channel, and the water vapor compressor further comprises: The shell is provided with a sixth air inlet channel for communicating with an external air source; The second diffuser assembly is sleeved on the fourth seal and fixedly connected with the shell, and the fourth air outlet channel extends along the radial direction of the driving shaft and penetrates through the second diffuser assembly; The second air inlet pipe has one end connected with the fifth air inlet channel and the other end connected with the sixth air inlet channel on the side close to the fourth seal.

16. The water vapor compressor of claim 10, wherein, The water vapor compressor comprises: a stator winding located between the first impeller and the second impeller; a magnetic steel assembly fixedly connected with the driving shaft and magnetically coupled with the stator winding; and an axial magnetic bearing assembly sleeved on the driving shaft, the axial magnetic bearing assembly being located between the stator winding and the second impeller.

17. A water vapor compression system characterized by, The water vapor compressor comprises: a stator winding located between the first impeller and the second impeller; a magnetic steel assembly fixedly connected with the driving shaft and magnetically coupled with the stator winding; and an axial magnetic bearing assembly sleeved on the driving shaft, the axial magnetic bearing assembly being located between the stator winding and the second impeller. The water vapor compressor comprises: a stator winding located between the first impeller and the second impeller; a magnetic steel assembly fixedly connected with the driving shaft and magnetically coupled with the stator winding; and an axial magnetic bearing assembly sleeved on the driving shaft, the axial magnetic bearing assembly being located between the stator winding and the second impeller. The water vapor compressor comprises: a stator winding located between the first impeller and the second impeller; a magnetic steel assembly fixedly connected with the driving shaft and magnetically coupled

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