Centrifugal water vapor compressor

Abstract

The application provides a centrifugal water vapor compressor, comprising: a volute; a diffuser plate connected with the volute and forming a rotor cavity, the diffuser plate having a first central hole; an impeller located in the rotor cavity; a main shaft connected with the impeller through the first central hole; a shaft sleeve located in the first central hole and fixedly sleeved on the outer periphery of the main shaft; a comb seal fixed in the first central hole and sleeved on the outer periphery of the shaft sleeve, used for sealing the gap between the diffuser plate and the shaft sleeve, the comb seal comprising a plurality of sealing teeth distributed in the axial direction and in gap fit with the shaft sleeve, a labyrinth flow channel being formed between the plurality of sealing teeth and the shaft sleeve; and a cooling water inlet channel in communication with the labyrinth flow channel and configured to pass cooling water into the labyrinth flow channel. The centrifugal water vapor compressor can reduce the heating temperature of the main shaft and the comb seal, and improve the sealing effect.

Description

Technical Field

[0001] This application relates to the field of compression equipment technology, and in particular to a centrifugal steam compressor. Background Technology

[0002] To prevent ozone layer depletion and exacerbate the greenhouse effect, finding an economical, safe, and environmentally friendly refrigerant is the best option. Water, a fundamental substance in the composition of life on Earth, is an extremely superior refrigerant in terms of environmental protection and safety. Although water has advantages as a refrigerant, its physical properties—low molecular weight, high adiabatic index, and large specific volume—also determine that water vapor compression systems have characteristics such as high pressure ratio, low refrigeration capacity per unit volume, and high exhaust temperature.

[0003] When centrifugal steam compressors are used in combination with other equipment in refrigeration and heat pump cycles, they can effectively increase the pressure ratio of steam and reduce the exhaust temperature of steam, thereby improving system efficiency and reducing energy consumption. However, the higher exhaust temperature has an adverse effect on the high temperature resistance and sealing performance of shafts and bearings. Summary of the Invention

[0004] The purpose of this application is to provide a centrifugal steam compressor that aims to solve the problem that high exhaust temperature has an adverse effect on the high temperature resistance and sealing performance of shafts and bearings.

[0005] This application provides a centrifugal steam compressor, comprising:

[0006] Snail shell;

[0007] A diffuser plate is connected to the volute and forms a rotor cavity, the diffuser plate having a first central hole;

[0008] The impeller is located inside the rotor cavity;

[0009] The main shaft passes through the first central hole and is connected to the impeller;

[0010] A bushing, located inside the first central hole, is fixedly fitted onto the outer periphery of the main shaft;

[0011] A comb-tooth seal, fixed within the first central hole and sleeved on the outer periphery of the bushing, is used to seal the gap between the diffuser plate and the bushing. The comb-tooth seal includes multiple axially distributed sealing teeth that fit clearanceably with the bushing, forming a labyrinthine flow channel between the multiple sealing teeth and the bushing.

[0012] The cooling water inlet channel is connected to the labyrinth flow channel and is configured to introduce cooling water into the labyrinth flow channel.

[0013] In some embodiments of the centrifugal water vapor compressor, the cooling water inlet passage comprises a first radial hole disposed on the comb seal, the first radial hole gradually increasing in cross section from an inlet end located radially outward to an outlet end located radially inward.

[0014] In some embodiments of the centrifugal water vapor compressor, the first radial hole is a conical hole.

[0015] In some embodiments of the centrifugal water vapor compressor, the cooling water inlet passage further comprises a second radial hole disposed on the diffuser plate, an outlet end of the second radial hole opposite to an inlet end of the first radial hole.

[0016] In some embodiments of the centrifugal water vapor compressor, the second radial hole is an equal-diameter hole, an outlet end of the second radial hole aligned with an edge of the inlet end of the first radial hole.

[0017] In some embodiments of the centrifugal water vapor compressor, along an axial direction of the comb seal, the outlet end of the cooling water inlet passage is located at a middle portion of the comb seal.

[0018] In some embodiments of the centrifugal water vapor compressor,

[0019] The sealing teeth proximate to the impeller comprise tooth surfaces inclined from radially outward to radially inward toward the impeller; and / or

[0020] The sealing teeth proximate to the outlet end of the cooling water inlet passage comprise tooth surfaces inclined from radially outward to radially inward toward the outlet end of the cooling water inlet passage.

[0021] In some embodiments of the centrifugal water vapor compressor, the centrifugal water vapor compressor further comprises:

[0022] A baffle plate located at an end of the diffuser plate distal to the volute, the baffle plate having a second central hole through which the main shaft passes; and

[0023] A water blocking sleeve located within the second central hole and fixedly sleeved on an outer periphery of the main shaft, the water blocking sleeve in clearance fit with a hole wall of the second central hole of the baffle plate, a radially outer end of the water blocking sleeve comprising a water blocking ring extending toward the comb seal and in clearance fit with the comb seal, a water blocking cavity formed between the water blocking sleeve and the comb seal, the baffle plate, the water blocking sleeve and the diffuser plate forming a water throwing cavity, the centrifugal water vapor compressor further comprising a cooling water outlet passage configured to lead out cooling water within the water throwing cavity.

[0024] In some embodiments of the centrifugal water vapor compressor, the cooling water outlet channel comprises a third radial hole arranged on the baffle.

[0025] In some embodiments of the centrifugal water vapor compressor, the gap between the comb seal and the water blocking ring is 0.5-1mm.

[0026] In some embodiments of the centrifugal water vapor compressor, the water blocking sleeve further comprises a water throwing tooth arranged at the radially outer end of the water blocking ring.

[0027] In some embodiments of the centrifugal water vapor compressor,

[0028] The water throwing tooth is inclined from the radially inner side to the radially outer side towards one side of the comb seal; and / or

[0029] A plurality of the water throwing teeth are arranged side by side along the axial direction of the water blocking ring.

[0030] In some embodiments of the centrifugal water vapor compressor, the centrifugal water vapor compressor further comprises a motor bearing arranged at the end of the water blocking sleeve away from the comb seal, sleeved on the main shaft to support the main shaft, and the motor bearing is a water lubricated bearing.

[0031] The centrifugal water vapor compressor provided in the present application can reduce the heating temperature of the main shaft and the comb seal, and improve the sealing effect.

[0032] Other features and advantages of the present application will become apparent from the following detailed description of exemplary embodiments thereof, taken in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF DRAWINGS

[0033] The accompanying drawings, which are included to provide a further understanding of the present application, constitute a part of the present application and illustrate exemplary embodiments of the present application and its description are used to explain the present application and do not constitute an improper limitation to the present application. In the drawings:

[0034] Figure 1 is a structural schematic view of part of the centrifugal water vapor compressor of the embodiments of the present application.

[0035] Figure 2 is a structural schematic view of part of the centrifugal water vapor compressor of the embodiments of the present application. Figure 1 DETAILED DESCRIPTION

[0036] ​With reference to the drawings and the embodiments described herein, it will be understood that the application is not limited in its application to the details of construction, the arrangements of the components and the steps set forth in the description or illustrated in the drawings. The application is capable of other embodiments and of being practiced or being carried out in various ways. Also, it is understood that the phraseology and terminology used herein is for the purpose of description and should not be regarded as limiting. The use of "including" and "comprising" and variations thereof herein is meant to encompass the items listed thereafter and equivalents thereof as well as additional items. Unless specified or limited otherwise, the terms "connected" and "coupled" and variations thereof are used broadly and encompass both direct and indirect connections and couplings. Further, "connected" and "coupled" and variations thereof are used herein to indicate that if directly or indirectly connected or coupled, there exists a physical or logical communication, electrical, mechanical, optical, electromagnetic or other relationship or connection or coupling between the connected or coupled items or devices. Moreover, unless specifically stated otherwise, or as is apparent from the discussion, terms such as "processing" or "computing" or "calculating" or "determining" or "displaying" or the like, refer to the action and processes of a computer system, or similar electronic device, that manipulates and transforms data represented as physical quantities (e.g., electronic) within the computer system memories or registers or other information storage, transmission or display devices. Note that the word "comprising" is not used as a limitation in any way in this document, including in this section. It is also to be understood that the use of "about" or "approximately" in connection with a value means that the value is within a reasonable functional range and precision of the particular measurement as known by those of ordinary skill in the art.

[0037] The relative arrangement of parts and steps, numerical expressions, and numerical values set forth in the examples are not intended to limit the scope of the present application unless otherwise specifically stated. Also, it is to be understood that the dimensions of the various parts shown in the drawings are not drawn to scale. Techniques, methods, and apparatus known to those of ordinary skill are not discussed in detail because they would be apparent in context, and should be considered as part of the description. In all examples shown and discussed herein, any specific values are to be interpreted as merely illustrative and not limiting. Thus, other examples of the example embodiments can have different values. It is to be noted that like numbers and letters refer to like parts throughout the several views of the drawings and that the figures are not necessarily to scale as the emphasis is on the functional description of the drawings. Furthermore, characterizing the present application as comprising certain features is not to be construed as excluding the presence of further features or as excluding the possibility of further features being added to the application.

[0038] In the description of the present application, it is to be understood that the use of terms such as "first" and "second" are used to distinguish one part from another, and are not intended to denote a particular order of importance, unless otherwise specifically stated. Unless otherwise specifically stated, the use of the term "about" or "approximately" in connection with a value refers to the standard range of tolerance in the art. For example, "about 45 degrees" is a range of values plus or minus ten percent from 45 degrees.

[0039] In the description of the present application, it is to be understood that the use of terms such as "front," "back," "up," "down," "left," "right," "vertical," "horizontal," "top" and "bottom" are used for convenience and are not intended to be limiting as to the application. These terms are only intended to reflect relative positions on the drawings. The orientation of these devices can be reversed, and their general utility is not limited to any particular orientation. Unless otherwise specifically stated, the terms "front," "back," "up," "down," "left," "right," "vertical," "horizontal," "top" and "bottom" are intended to indicate relative positions on the drawings and are not intended to denote a particular orientation or configuration of the device or element being described.

[0040] As Figure 1 and Figure 2As shown in the drawings, the embodiments of the present application provide a centrifugal water vapor compressor. The centrifugal water vapor compressor includes a volute 1, a diffuser plate 4, an impeller 2, a main shaft 5, a shaft sleeve 9, a comb seal 3, and a cooling water inlet channel. The diffuser plate 4 is connected with the volute 1 and forms a rotor cavity, and the diffuser plate 4 has a first central hole. The impeller 2 is located in the rotor cavity. The main shaft 5 passes through the first central hole and is connected with the impeller 2. The shaft sleeve 9 is located in the first central hole and is fixedly sleeved on the outer periphery of the main shaft 5. The comb seal 3 is fixed in the first central hole and is sleeved on the outer periphery of the shaft sleeve 9, and is used for sealing the gap between the diffuser plate 4 and the shaft sleeve 9. The comb seal 3 includes a plurality of sealing teeth distributed in the axial direction and in a clearance fit with the shaft sleeve 9, and a labyrinth flow channel is formed between the plurality of sealing teeth and the shaft sleeve 9. The cooling water inlet channel is in communication with the labyrinth flow channel and is configured to introduce cooling water into the labyrinth flow channel.

[0041] According to the centrifugal water vapor compressor of the embodiments of the present application, the heating temperature of the main shaft and the comb seal can be reduced, and the sealing effect can be improved.

[0042] As shown in the drawings, Figure 1 and Figure 2 in some embodiments of the centrifugal water vapor compressor, the cooling water inlet channel includes a first radial hole 31 arranged on the comb seal 3, and the first radial hole 31 gradually increases in cross section from an inlet end located on the radially outer side to an outlet end located on the radially inner side.

[0043] As shown in the drawings, Figure 1 and Figure 2 in some embodiments of the centrifugal water vapor compressor, the first radial hole 31 is a conical hole.

[0044] As shown in the drawings, Figure 1 and Figure 2 in some embodiments of the centrifugal water vapor compressor, the cooling water inlet channel further includes a second radial hole 41 arranged on the diffuser plate 4, and the outlet end of the second radial hole 41 is opposite to the inlet end of the first radial hole 31.

[0045] As shown in the drawings, Figure 1 and Figure 2 in some embodiments of the centrifugal water vapor compressor, the second radial hole 41 is a constant-diameter hole, and the outlet end of the second radial hole 41 is aligned with the edge of the inlet end of the first radial hole 31.

[0046] As shown in the drawings, Figure 1 and Figure 2 in some embodiments of the centrifugal water vapor compressor, along the axial direction of the comb seal 3, the outlet end of the cooling water inlet channel is located at the middle part of the comb seal 3.

[0047] As shown in the drawings, Figure 1 and Figure 2As shown, in some embodiments of the centrifugal steam compressor, the sealing teeth near the impeller 2 include tooth surfaces that are inclined toward the impeller 2 from the radially outer side to the radially inner side; and / or the sealing teeth near the outlet end of the cooling water inlet channel include tooth surfaces that are inclined toward the outlet end of the cooling water inlet channel from the radially outer side to the radially inner side.

[0048] like Figure 1 and Figure 2 As shown, in some embodiments of the centrifugal steam compressor, the centrifugal steam compressor further includes a baffle 8 and a water-blocking sleeve 7. The baffle 8 is located at the end of the diffuser plate 4 away from the volute 1, and the baffle 8 has a second central hole through which the main shaft 5 passes. The water-blocking sleeve 7 is located inside the second central hole and is fixedly fitted around the outer periphery of the main shaft 5, with a clearance fit between the water-blocking sleeve 7 and the wall of the second central hole of the baffle 8. The radially outer end of the water-blocking sleeve 7 includes a water-blocking ring 71 extending toward the comb seal 3 and with a clearance fit to the comb seal 3. A water-blocking cavity is formed between the water-blocking sleeve 7 and the comb seal 3. The baffle 8, the water-blocking sleeve 7, and the diffuser plate 4 form a water-throwing cavity. The centrifugal steam compressor also includes a cooling water outlet channel configured to lead out cooling water from the water-throwing cavity.

[0049] like Figure 1 and Figure 2 As shown, in some embodiments of the centrifugal steam compressor, the cooling water outlet channel includes a third radial hole 81 disposed on the baffle 8.

[0050] like Figure 1 and Figure 2 As shown, in some embodiments of the centrifugal steam compressor, the gap between the comb seal 3 and the water-blocking ring 71 is 0.5-1mm.

[0051] like Figure 1 and Figure 2 As shown, in some embodiments of the centrifugal steam compressor, the water-blocking sleeve 7 further includes water-throwing teeth 72, which are disposed at the radial outer end of the water-blocking ring 71.

[0052] like Figure 1 and Figure 2 As shown, in some embodiments of the centrifugal steam compressor, the water-throwing teeth 72 are inclined from the radial inside to the radial outside toward the comb seal 3 side; and / or multiple water-throwing teeth 72 are arranged side by side along the axial direction of the water-blocking ring 71.

[0053] like Figure 1 and Figure 2 As shown, in some embodiments of the centrifugal steam compressor, the centrifugal steam compressor also includes a motor bearing 6, located at the end of the water-blocking sleeve 7 away from the comb seal 3, and fitted onto the main shaft 5 to support the main shaft 5. The motor bearing 6 is a water-lubricated bearing.

[0054] The following combination Figure 1 and Figure 2 The embodiments of this application will be described in more detail.

[0055] The structure of the centrifugal steam compressor in this application embodiment is as follows: Figure 2 and Figure 2 As shown, it mainly includes: volute 1, impeller 2, comb seal 3, diffuser plate 4, main shaft 5, motor bearing 6, water blocking sleeve 7, baffle 8, and shaft sleeve 9.

[0056] The volute 1 is an irregular part. The inlet end face of the volute 1 is equivalent to the wheel cover of a closed impeller, which cooperates with the blades of the impeller 2, thereby enabling the impeller 2 to do work on the inlet airflow, thus accelerating and pressurizing it. The left end face of the diffuser plate 4 and the right end face of the volute 1 form an airflow diffusion channel, which enables the outlet airflow of the impeller 2 to achieve a diffusion effect and increase the pressure.

[0057] Impeller 2 is an open impeller, a component of a centrifugal steam compressor that compresses steam. In related technologies, when the impeller rotates at high speed, the temperature and pressure of the airflow continuously increase, and the heat gradually diffuses towards the motor. This diffused heat is mainly absorbed by the comb seal, causing the comb seal temperature to rise continuously. However, the Babbitt alloy on the inner surface of the comb seal cannot withstand excessively high temperatures; otherwise, it will detach, causing the comb seal to fail, thereby increasing gas leakage and reducing the compressor's energy efficiency.

[0058] To solve the problem of high temperature in comb seal 3, such as Figure 2 As shown, this embodiment of the application provides a water cooling inlet channel, which can supply water cooling to the labyrinth flow channel between the comb seal 3 and the bushing 9. A second radial hole 41 and a first radial hole 31 are respectively provided on the diffuser plate 4 and the comb seal 3 as cooling water inlet channels. The inflow of cooling water into the labyrinth flow channel can cool the comb seal 3, the bushing 9, and the main shaft 5, and also provides a liquid seal for the labyrinth flow channel. Furthermore, because the pressure in the cooling water inlet channel is greater than the pressure in the labyrinth flow channels on both sides, the cooling water to the impeller 2 side is forced into the flow channel cavity formed by the impeller 2 hub and the diffuser plate 4. During the rotation of the impeller 2, the cooling water in the flow channel cavity is thrown into the diffuser flow channel, mixing with the outlet airflow of the impeller 2. The high outlet steam temperature of the impeller 2 can vaporize the water droplets thrown into the diffuser flow channel. After vaporization, the water droplets increase the molecular mass of the fluid, which can cool and reduce noise in the outlet airflow.

[0059] Cooling water flowing towards the motor bearing 6 is forced into the water-blocking cavity formed by the water-blocking sleeve 7 and the comb-tooth seal 3. The gap between the water-blocking ring 71 of the water-blocking sleeve 7 and the comb-tooth seal 3 is controlled at 0.5-1mm. During the rotation of the main shaft 5, the water in the water-blocking cavity is sprayed from this gap onto the diffuser plate 4 and the baffle 8, and finally discharged from the compressor through the third radial hole 81 at the bottom of the baffle 8, which serves as the cooling water outlet.

[0060] To prevent cooling water splashed onto the water-blocking sleeve 7 from flowing into the motor cavity through the gap between the baffle 8 and the water-blocking sleeve 7, the water-blocking sleeve 7 is provided with water-throwing teeth 72. When the water-blocking sleeve 7 rotates with the main shaft 5, it throws the cooling water back onto the diffuser plate 4 and the baffle 8, thereby preventing the cooling water from flowing into the motor cavity and ensuring that the motor cavity is dry.

[0061] The second radial hole 41 on the diffuser plate 4 is a straight hole, which facilitates the rapid entry of cooling water into the first radial hole 31 of the comb seal 3 for cooling. Since the main shaft 5 and the comb seal 3 absorb most of the diffused heat, the temperature on the impeller 2 side is higher than that on the motor bearing 6 side. The closer to the main shaft 5, the higher the temperature, and the easier it is for the cooling water to vaporize and expand. Therefore, the first radial hole 31 on the comb seal 3 is designed as a conical hole with a cross-section that increases from the radial outer side to the radial inner side. That is, the closer to the main shaft 5, the larger the diameter of the first radial hole 31.

[0062] To enhance cooling and sealing performance, the multiple sealing teeth of the comb seal 3 are arranged as follows: ​ As shown. The sealing teeth near the impeller surface ( ​ The three teeth (counting from left to right) need to be sealed to prevent high-temperature water vapor from leaving through the comb-tooth seal 3 instead of entering the diffuser channel. These sealing teeth include an inclined surface facing the impeller 2 from the radially outer side to the radially inner side. The pressure in the first radial hole 31 is greater than the pressure in the labyrinth channels on both sides. The sealing teeth near the outlet end of the first radial hole 31 (i.e., the outlet end of the cooling water inlet channel) (two teeth on the left side of the first radial hole 31 and four teeth on the right side of the first radial hole 31) include an inclined surface facing the outlet end of the cooling water inlet channel from the radially outer side to the radially inner side.

[0063] In addition, in order to ensure the cooling and sealing of the motor bearing 6 side of the comb seal 3, the number of sealing teeth on the side closer to the motor bearing 6 can be 1-2 more than the number of sealing teeth on the side closer to the impeller 2. In this way, the cooling water can cool the bearing side of the comb seal and prevent it from flowing into the motor cavity, which is conducive to ensuring the sealing effect.

[0064] The motor bearing 6 in the embodiment is a water-lubricated bearing, and its working medium is water. During operation, the motor bearing 6 is lubricated by water, and no lubricating oil or lubricating grease is needed. Thus, the harm of water pollution is eliminated, the temperature rise of the motor bearing 6 is effectively controlled, and the cooling water drops of the water-lubricated bearing are prevented from entering the motor cavity by the water-blocking sleeve 7 and the baffle 8. Thus, the influence of the cooling water drops of the water-lubricated bearing on the motor cavity is reduced.

[0065] The shaft sleeve 9 is a hollow rotary part, and can be made of stainless steel. Thus, the corrosion of the main shaft 5 by the cooling water is prevented.

[0066] According to the above description, the centrifugal water vapor compressor has at least one of the following advantages:

[0067] The water-cooled comb seal has a water seal function, and is beneficial to reducing the heating temperature of the main shaft and the comb seal, avoiding the failure of the comb seal, improving the sealing effect, and improving the reliability of the compressor operation.

[0068] The centrifugal water vapor compressor is beneficial to reducing the noise during operation.

[0069] The water-blocking sleeve and the baffle are beneficial to preventing the cooling water from entering the motor cavity.

[0070] The water-lubricated bearing is beneficial to further reducing the influence of the cooling water on the motor cavity.

[0071] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, but not to limit them; although the present application has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the specific embodiments of the present application can be modified or some technical features can be replaced by equivalent ones, which should be covered in the technical solution range of the present application.

Claims

1. A centrifugal water vapor compressor characterized by, The centrifugal water vapor compressor comprises: a volute (1); a diffuser plate (4) connected with the volute (1) and forming a rotor cavity, the diffuser plate (4) having a first central hole; an impeller (2) located in the rotor cavity; a main shaft (5) passing through the first central hole and connected with the impeller (2); a shaft sleeve (9) located in the first central hole and fixedly sleeved on the outer periphery of the main shaft (5); a comb seal (3) fixed in the first central hole and sleeved on the outer periphery of the shaft sleeve (9), used for sealing the gap between the diffuser plate (4) and the shaft sleeve (9), the comb seal (3) comprising a plurality of sealing teeth distributed in the axial direction and in gap fit with the shaft sleeve (9), a labyrinth flow channel being formed between the plurality of sealing teeth and the shaft sleeve (9); a cooling water inlet passage in communication with the labyrinth flow channel and configured to pass cooling water into the labyrinth flow channel; a baffle plate (8) located at one end of the diffuser plate (4) away from the volute (1) and having a second central hole, the main shaft (5) passing through the second central hole; a water blocking sleeve (7) located in the second central hole and fixedly sleeved on the outer periphery of the main shaft (5), in gap fit with the hole wall of the second central hole of the baffle plate (8), the radial outer end of the water blocking sleeve (7) comprising a water blocking ring (71) extending towards the comb seal (3) and in gap fit with the comb seal (3), a water blocking cavity being formed between the water blocking sleeve (7) and the comb seal (3) and located radially inside the water blocking ring (71), the baffle plate (8), the water blocking sleeve (7) and the diffuser plate (4) forming a water throwing cavity located radially outside the water blocking cavity; and a cooling water outlet passage configured to lead out the cooling water in the water throwing cavity. The cooling water inlet passage comprises a first radial hole (31) provided on the comb seal (3), the first radial hole (31) gradually increasing in cross section from an inlet end located radially outside to an outlet end located radially inside.

2. The centrifugal water vapor compressor according to claim 1, characterized in that, The first radial hole (31) is a conical hole.

3. The centrifugal water vapor compressor of claim 2, wherein, The cooling water inlet passage further comprises a second radial hole (41) provided on the diffuser plate (4), the outlet end of the second radial hole (41) opposite to the inlet end of the first radial hole (31).

4. The centrifugal water vapor compressor of claim 2, wherein, The second radial hole (41) is an equal-diameter hole, the outlet end of the second radial hole (41) aligned with the edge of the inlet end of the first radial hole (31).

5. The centrifugal water vapor compressor of claim 4, wherein, In the axial direction of the comb seal (3), the outlet end of the cooling water inlet passage is located in the middle of the comb seal (3).

6. The centrifugal water vapor compressor of claim 1, wherein, 7. The centrifugal water vapor compressor according to claim 1, wherein: the sealing teeth close to the impeller (2) comprise tooth surfaces inclined from the radial outside to the radial inside towards the impeller (2); and / or the sealing teeth close to the outlet end of the cooling water inlet passage comprise tooth surfaces inclined from the radial outside to the radial inside towards the outlet end of the cooling water inlet passage. The cooling water outlet passage comprises a third radial hole (81) provided on the baffle plate (8).

8. The centrifugal water vapor compressor according to any one of claims 1 to 7, characterized in that, ​ 9. The centrifugal water vapor compressor according to any one of claims 1 to 7, characterized in that, The gap between the comb seal (3) and the water blocking ring (71) is 0.5-1mm.

10. The centrifugal water vapor compressor according to any one of claims 1 to 7, characterized in that, The water blocking sleeve (7) further comprises water throwing teeth (72) arranged at the radially outer end of the water blocking ring (71).

11. The centrifugal water vapor compressor according to claim 10, characterized in that, The water throwing teeth (72) are inclined from the radially inner side to the radially outer side towards the side of the comb seal (3); and / or A plurality of the water throwing teeth (72) are arranged side by side along the axial direction of the water blocking ring (71).

12. The centrifugal water vapor compressor according to any one of claims 1 to 7, characterized in that, Further comprising a motor bearing (6) located at the end of the water blocking sleeve (7) away from the comb seal (3), sleeved on the main shaft (5) to support the main shaft (5), and the motor bearing (6) is a water lubricated bearing.

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