A hydrogen circulation pump

Abstract

The present invention provides a hydrogen circulation pump, which relates to the field of pump technology. The hydrogen circulation pump includes a housing assembly and a shaft assembly arranged in the housing assembly, the shaft assembly includes an impeller and a rotor shaft, the impeller is provided with an assembly hole along the center line, a plurality of anti-rotation grooves are provided in the circumference of the assembly hole, and anti-rotation teeth are provided on the outer circumferential surface of the rotor shaft corresponding to the anti-rotation grooves, and when the rotor shaft cooperates with the assembly hole, the anti-rotation teeth cooperate with the corresponding anti-rotation grooves to make the rotor shaft and the impeller rotate synchronously. The hydrogen circulation pump provided by the present invention improves the assembly accuracy of the rotor shaft and the impeller by cooperating with the anti-rotation teeth and the corresponding anti-rotation grooves, and at the same time has a better ability to transmit torque, thereby realizing accurate positioning of high-speed rotation when the rotor shaft drives the impeller to rotate at high speed, while ensuring operational stability, thereby improving the working performance of the hydrogen circulation pump.

Description

Technical Field

[0001] The present invention relates to the technical field of pumps, and in particular to a hydrogen circulation pump. Background Art

[0002] The hydrogen circulation pump is an important functional component in the fuel cell system. Its function is to pressurize and recirculate the mixed gas of hydrogen, nitrogen and saturated water vapor that has not reacted completely in the fuel cell stack, so as to save hydrogen fuel and improve the power generation efficiency of the entire stack.

[0003] At present, the existing fuel cell hydrogen boosting system is mainly based on low-speed + traditional mechanical seal structure represented by rotary positive displacement circulation pumps, such as vortex type, claw type, roots type, etc. These pump types are generally large in size and weight, and the operating noise and power consumption cannot meet the use requirements.

[0004] The high-speed centrifugal circulating pump has obvious advantages in this regard. The high-speed centrifugal circulating pump makes the hydrogen booster impeller rotate to do work on the gas working medium, thereby increasing the working medium kinetic energy. And by increasing the speed to 100,000 revolutions, the volume and weight of the centrifugal circulating pump can be reduced. However, the high-speed centrifugal hydrogen pump used in fuel cell systems still has the problem of insufficient stability of the hydrogen booster impeller and the shaft system at high speeds. Summary of the invention

[0005] The purpose of the present application is to provide a hydrogen circulation pump to solve the deficiencies in the prior art.

[0006] To achieve the above-mentioned purpose, the present application provides a hydrogen circulation pump, comprising a housing assembly and a shaft assembly disposed in the housing assembly;

[0007] The shaft system assembly includes an impeller and a rotor shaft. The impeller is provided with an assembly hole along the center line. A plurality of anti-rotation grooves are provided in the circumferential direction of the assembly hole. Anti-rotation teeth are provided on the outer circumferential surface of the rotor shaft corresponding to the anti-rotation grooves. When the rotor shaft is matched with the assembly hole, the anti-rotation teeth are matched with the corresponding anti-rotation grooves to make the rotor shaft and the impeller rotate synchronously.

[0008] In a possible implementation, the spiral direction of the plurality of anti-rotation grooves is consistent with the rotation direction of the rotor shaft, and the anti-rotation teeth are adapted to the anti-rotation grooves.

[0009] In a possible implementation, the width of the anti-rotation groove gradually decreases in a direction away from the center line of the impeller.

[0010] In a possible implementation manner, the rotor shaft and the housing assembly are rotationally matched, and a bidirectional spiral sealing structure is provided at the matching position between the rotor shaft and the housing assembly.

[0011] In a possible implementation manner, the rotor shaft is provided with a reverse spiral groove on an outer cylindrical surface corresponding to the housing assembly, and the housing assembly is provided with a forward spiral groove corresponding to the reverse spiral groove.

[0012] In a possible implementation manner, the impeller is fixedly connected to the rotor shaft via a locking member.

[0013] In a possible implementation, a blade group is provided on a side of the impeller facing away from the anti-rotation groove, and the blade group includes long blades and short blades distributed at circumferential intervals along the center line of the impeller.

[0014] In a possible implementation, the housing assembly includes a pump housing body and a motor housing, the pump housing body and the motor housing are sealed together, wherein the pump housing body is provided with an inlet and outlet flow adapter, and the motor housing is provided with a cooling and heat dissipation structure.

[0015] In a possible implementation, the cooling and heat dissipation structure includes a water cooling channel disposed in the motor housing and / or heat dissipation fins disposed on a surface of the motor housing.

[0016] In a possible implementation, the hydrogen circulation pump further includes a stator assembly, wherein the stator assembly is disposed in the housing assembly, and a rotor magnet is disposed on the rotor shaft corresponding to the stator assembly, and the stator assembly and the rotor magnet are magnetically matched.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] The present application provides a hydrogen circulation pump, including a housing assembly and a shaft assembly disposed in the housing assembly, the shaft assembly including an impeller and a rotor shaft, the impeller is provided with an assembly hole along the center line, a plurality of anti-rotation grooves are provided in the circumference of the assembly hole, and anti-rotation teeth are provided on the outer circumference of the rotor shaft corresponding to the anti-rotation grooves, and when the rotor shaft is matched with the assembly hole, the anti-rotation teeth are matched with the corresponding anti-rotation grooves to make the rotor shaft and the impeller rotate synchronously. The hydrogen circulation pump provided by the present application improves the assembly accuracy of the rotor shaft and the impeller by matching the anti-rotation teeth with the corresponding anti-rotation grooves, and at the same time has a better ability to transmit torque, thereby achieving accurate positioning of high-speed rotation when the rotor shaft drives the impeller to rotate at high speed, while ensuring operational stability, thereby improving the working performance of the hydrogen circulation pump. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0020] Figure 1 A schematic diagram of the three-dimensional structure of a hydrogen circulation pump provided in an embodiment of the present application is shown;

[0021] Figure 2 Shows Figure 1 Sectional view along AA direction;

[0022] Figure 3 Shows Figure 2 A partial enlarged schematic diagram of point B in the middle;

[0023] Figure 4 Shows Figure 2 A partial enlarged schematic diagram of point C in the middle;

[0024] Figure 5 Shows Figure 2 A schematic diagram of the three-dimensional structure of the impeller and the rotor shaft in the hydrogen circulation pump shown in FIG.

[0025] Figure 6 Shows Figure 5 A schematic diagram of the three-dimensional structure of the impeller shown in FIG.

[0026] Figure 7 Shows Figure 6 A partial enlarged schematic diagram of point D in the middle;

[0027] Figure 8 Shows Figure 5 A schematic diagram of the three-dimensional structure of the rotor shaft shown in;

[0028] Fig. 9 Shows Figure 8 A partial enlarged schematic diagram of point E in the middle.

[0029] Description of main component symbols:

[0030] 100-housing assembly; 110-pump housing; 110a-inlet; 111-sealing interface; 112-inlet adapter; 113-outlet adapter; 114-second seal; 115-first seal; 120-motor housing; 121-cooling water inlet and outlet; 122-cooling and heat dissipation structure; 122a-water cooling channel; 122b-heat dissipation fin; 124-forward spiral groove; 200-shaft assembly; 210-impeller; 210a-first side; 210b-second side; 211-impeller Plate group; 211a-long blade; 211b-short blade; 212-step hole; 2120-stop rotation groove; 2121-first side wall; 2122-second side wall; 212a-assembly hole; 212b-positioning hole; 220-suspension bearing; 230-rotor shaft; 231-reverse spiral groove; 232-assembly section; 2320-stop rotation tooth; 2321-third side wall; 2322-fourth side wall; 233-positioning section; 234-locking section; 240-locking piece; 300-stator assembly. DETAILED DESCRIPTION

[0031] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0032] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0033] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0034] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0035] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0036] Example

[0037] See also Figure 1 and Figure 2 This embodiment provides a hydrogen circulation pump, including a housing assembly 100 and a stator assembly 300 and a shaft assembly 200 disposed in the housing assembly 100 .

[0038] Among them, the housing assembly 100 includes a pump housing body 110 and a motor housing 120. The pump housing body 110 is arranged at one end of the motor housing 120. The pump housing body 110 and the motor housing 120 are detachably connected, and a first seal 115 is provided at the matching position of the pump housing body 110 and the motor housing 120 for sealing.

[0039] A pump cavity is formed between the pump housing body 110 and the motor housing 120. The pump housing body 110 is provided with an inlet 110a and an outlet (not shown), and the inlet 110a and the outlet are provided with corresponding inlet adapters 112 and outlet adapters 113, respectively.

[0040] Furthermore, the pump housing body 110 is processed with sealing interfaces 111 at the inlet 110a and the outlet, and the inlet adapter 112 and the outlet adapter 113 are installed and positioned through the corresponding sealing interfaces 111. After the inlet adapter 112 and the outlet adapter 113 are positioned and installed at the corresponding positions through the sealing interfaces 111, they are fixed to the pump housing body 110 by screws. Among them, the inlet adapter 112, the outlet adapter 113 and the pump housing body 110 are sealed by the second sealing member 114.

[0041] Optionally, the first sealing member 115 and the second sealing member 114 may be O-type or T-type sealing rings.

[0042] An assembly space is formed inside the motor housing 120 , and a cooling and heat dissipation structure 122 is provided on the motor housing 120 . The cooling and heat dissipation structure 122 can take away the heat generated inside the motor housing 120 to maintain the normal and stable operation of the hydrogen circulation pump.

[0043] In some embodiments, the cooling and heat dissipation structure 122 is a water cooling channel 122a arranged in the motor housing 120, and a cooling water inlet and outlet 121 connected to an external cold water supply pipeline is also provided on the outer surface of the motor housing 120. Therefore, cooling water can be transported into the water cooling channel 122a, and heat can be exchanged between the cooling water and the motor housing 120 to drive the heat of the motor housing 120.

[0044] In other embodiments, the cooling and heat dissipation structure 122 is a heat dissipation fin 122 b disposed on the surface of the motor housing 120 , thereby increasing the heat dissipation area on the surface of the motor housing 120 to achieve the purpose of heat dissipation and cooling of the motor housing 120 .

[0045] See also Figure 2 In this embodiment, the cooling and heat dissipation structure 122 includes a water cooling channel 122a and heat dissipation fins 122b, and the water cooling channel 122a and the heat dissipation fins 122b are sequentially distributed along the axial direction of the motor housing 120, thereby enhancing the heat dissipation and cooling effect.

[0046] The water cooling channel 122a is close to the pump housing body 110. Specifically, the side of the motor housing 120 close to the pump housing body 110 is a double-layer jacket structure, and a spiral water cooling channel 122a is formed in the double-layer jacket around the axis of the motor housing 120. The heat dissipation fins 122b are located at one end of the motor housing 120 away from the pump housing body 110, and the number of the heat dissipation fins 122b is multiple, and the multiple heat dissipation fins 122b are evenly distributed along the axial direction or circumferential direction of the motor housing 120.

[0047] See also Figure 2 The stator assembly 300 is fixedly installed in the assembly space of the motor housing 120 , and the outer diameter of the stator assembly 300 is matched with the inner diameter of the motor housing 120 , thereby achieving heat transfer through the surface matching between the stator assembly 300 and the motor housing 120 .

[0048] See also Figure 2The shaft assembly 200 includes an impeller 210 , a rotor shaft 230 and two suspension bearings 220 , wherein the two suspension bearings 220 are fixedly installed in the assembly space of the motor housing 120 , and the two suspension bearings 220 are distributed at both ends of the motor housing 120 along the axis of the motor housing 120 .

[0049] The rotor shaft 230 is disposed in the assembly space of the motor housing 120, and the rotor shaft 230 is a stepped shaft, and both ends of the rotor shaft 230 are respectively passed through the corresponding suspension bearings 220. When the hydrogen circulation pump is started, the two suspension bearings 220 and the rotor shaft 230 cooperate with each other through magnetic force, that is, the suspension bearings 220 use magnetic force to act on the rotor shaft 230, so that the rotor shaft 230 is suspended in the air, so that there is no mechanical contact between the rotor shaft 230 and the stator assembly 300, thereby meeting the purpose of high-speed operation of the hydrogen pump.

[0050] Furthermore, the rotor shaft 230 is made of a magnetically conductive material. The rotor shaft 230 is a stepped shaft, wherein the diameter of the rotor shaft 230 decreases from the middle to the two sections, and a rotor magnet (not shown) corresponding to the stator assembly 300 is provided in the middle of the rotor shaft 230 with the largest diameter, and the stator assembly 300 and the rotor magnet are magnetically matched. Specifically, the rotor magnet is integrated with a permanent magnet, and then through the rotating magnetic field generated by the stator assembly 300, combined with the suspension effect of the two suspension bearings 220, the stator assembly 300 can drive the rotor shaft 230 to rotate at high speed.

[0051] The impeller 210 is disposed in the pump cavity of the pump housing 110 , and one end of the rotor shaft 230 passes through the motor housing 120 and is engaged with the impeller 210 to prevent rotation.

[0052] See also Figure 2 , Figure 4 , Figure 5 and Figure 6 Among them, the impeller 210 is a semi-open three-dimensional twisted space blade impeller, which has extremely strong boosting ability and high efficiency, and can realize multi-phase flow boosting and transportation of hydrogen and water vapor.

[0053] Specifically, the impeller 210 includes a first side surface 210a and an opposite second side surface 210b, wherein the first side surface 210a is provided with a three-dimensionally twisted blade group 211, and the blade group 211 includes long blades 211a and short blades 211b distributed at circumferential intervals along the center line of the impeller 210.

[0054] Furthermore, both the long blades 211 a and the short blades 211 b extend from the outer edge of the impeller 210 toward the center line, wherein the extension length of the long blades 211 a is greater than that of the short blades 211 b.

[0055] The impeller 210 has a stepped hole 212 along the center line extending from the second side 210b to the first side 210a, and the stepped hole 212 includes a connected assembly hole 212a and a positioning hole 212b along the second side 210b to the first side 210a, wherein the diameter of the assembly hole 212a is larger than the positioning hole 212b.

[0056] Furthermore, a plurality of anti-rotation grooves 2120 are formed on the outer edge of the assembly hole 212a, and the plurality of anti-rotation grooves 2120 are distributed along the circumference of the assembly hole 212a. The spiral direction of the plurality of anti-rotation grooves 2120 is consistent with the rotation direction of the rotor shaft 230.

[0057] See also Figure 6 and Figure 7 , the width of the anti-rotation groove 2120 gradually decreases along the direction away from the center line of the impeller 210. Specifically, in this embodiment, the anti-rotation groove 2120 includes a first side wall surface 2121 and a second side wall surface 2122, wherein the extension direction of the first side wall surface 2121 passes through the center line of the impeller 210. The second side wall surface 2122 is an arcuate surface, wherein one end of the second side wall surface 2122 merges with the end of the first side wall surface 2121, and the other end of the second side wall surface 2122 is tangent to the inner wall of the assembly, and the second side wall surface 2122 is concave toward the outer edge direction of the impeller 210.

[0058] See also Figure 2 , Figure 4 and Figure 8 The end of the rotor shaft 230 that matches the impeller 210 includes a locking section 234, a positioning section 233, and an assembly section 232, wherein the locking section 234, the positioning section 233, and the assembly section 232 are sequentially arranged from the end to the inside along the axis of the rotor shaft 230. The locking section 234 passes through the stepped hole 212 of the impeller 210 and is exposed outside the impeller 210, the positioning section 233 is adapted to the positioning hole 212b, and the assembly section 232 is adapted to the assembly hole 212a.

[0059] See also Figure 4 , Figure 6 , Figure 8 and Fig. 9 , wherein the outer circumference of the positioning section 233 is a smooth cylindrical surface. A stop tooth 2320 is provided on the outer circumference of the assembly section 232 corresponding to the stop groove 2120, and the stop tooth 2320 is adapted to the size and shape of the stop groove 2120. That is, the stop tooth 2320 includes a third side wall surface 2321 and a fourth side wall surface 2322, the third side wall surface 2321 corresponds to the first side wall surface 2121, and the fourth side wall surface 2322 corresponds to the second side wall surface 2122.

[0060] Therefore, when the impeller 210 and the rotor shaft 230 are matched, the stop tooth 2320 will be accommodated in the stop groove 2120, and the tooth surface of the stop tooth 2320 will abut against the side wall surface of the stop groove 2120, so when the rotor shaft 230 rotates, the stop tooth 2320 will drive the impeller 210 to rotate synchronously with the rotor shaft 230.

[0061] It can be understood that the anti-rotation fit is formed by the anti-rotation tooth 2320 and the corresponding anti-rotation groove 2120, which will limit the relative rotation between the rotor shaft 230 and the impeller 210. Compared with the traditional spline fit, the fit between the anti-rotation tooth 2320 and the anti-rotation groove 2120 improves the assembly accuracy of the rotor shaft 230 and the impeller 210, and also has a better ability to transmit torque. Therefore, when the rotor shaft 230 drives the impeller 210 to rotate at high speed, accurate positioning of high-speed rotation can be achieved, while ensuring operational stability, thereby improving the working performance of the hydrogen circulation pump.

[0062] Furthermore, the plurality of anti-rotation grooves 2120 are evenly distributed along the circumference of the assembly hole 212a, so that the assembly hole 212a is in a flower-shaped structure when viewed from the second side 210b of the impeller 210. The evenly distributed plurality of anti-rotation grooves 2120 further improves the stability of torque transmission and ensures operational stability.

[0063] It is understandable that the number of the anti-rotation grooves 2120 and the anti-rotation teeth 2320 can be two, three, four, five or other numbers. Among them, the number of the anti-rotation grooves 2120 and the anti-rotation teeth 2320 can be adjusted according to design requirements, so the number of the anti-rotation grooves 2120 and the anti-rotation teeth 2320 is not limited in this embodiment.

[0064] See also Figure 4 and Figure 5 In this embodiment, the shaft assembly 200 further includes a locking member 240. The locking section 234 is provided with an opposite external thread, that is, the external thread rotates in the opposite direction to the rotor shaft 230. The locking member 240 is provided with an internal thread that matches the external thread on the locking section 234. When the impeller 210 is mounted on the rotor shaft 230, the locking member 240 and the locking section 234 are threadedly matched to fix the impeller 210 on the rotor shaft 230. Since the rotation direction of the external thread on the locking section 234 is the same as the rotation direction of the rotor shaft 230, it can prevent the impeller 210 from getting loose when the rotor shaft 230 drives the impeller 210 to rotate.

[0065] Optionally, the locking member 240 may be a cap nut.

[0066] See also Figure 2 and Figure 3Furthermore, the rotor shaft 230 and the motor housing 120 are rotationally matched, and a bidirectional spiral sealing structure is provided at the matching position between the rotor shaft 230 and the motor housing 120.

[0067] Specifically, the rotor shaft 230 is provided with a reverse spiral groove 231 on the outer cylindrical surface corresponding to the housing assembly 100, and the motor housing 120 is provided with a forward spiral groove 124 corresponding to the reverse spiral groove 231, wherein the reverse spiral groove 231 and the forward spiral groove 124 are non-contact matched, thereby forming a bidirectional spiral sealing structure. It can be understood that in this embodiment, the direction of rotation consistent with the rotor shaft 230 is defined as the forward direction, and the opposite direction is defined as the reverse direction.

[0068] Therefore, the bidirectional spiral seal structure can utilize the reverse dynamic pressure generated by the high-speed rotation of the rotor shaft 230 to resist the leakage of the front high-pressure hydrogen and water vapor, thereby achieving the purpose of sealing. At the same time, it can solve the problem that the traditional high-speed rotating shaft system has high power consumption and severe wear due to contact sealing, which cannot meet the use requirements.

[0069] Furthermore, the bidirectional spiral sealing structure is a non-contact seal, which does not affect the high-speed rotation of the rotor shaft 230. At the same time, the dynamic pressure effect generated by this sealing structure at the spiral groove can also increase the suspension height of the rotor shaft 230, improve the support stiffness of the rotor shaft 230, and reduce the amount of runout at the end of the rotor shaft 230, thereby suppressing the vibration of the impeller 210.

[0070] Compared with the traditional straight tooth groove sealing structure, the bidirectional spiral sealing structure can only reduce the leakage, but cannot achieve complete sealing. The bidirectional spiral sealing structure provided in this embodiment can generate reverse pump pressure through the high-speed rotation process of the rotor shaft 230, resist the leakage pressure to achieve balance, and achieve basically no leakage. At the same time, the non-contact sealing structure of the bidirectional spiral sealing structure can not only achieve high-speed operation but also control the vibration of the impeller 210, thereby solving the key technical problems of stable operation and sealing of the hydrogen circulation pump.

[0071] In addition, the bidirectional spiral seal structure is used to store water during the shutdown process, preventing water from entering the dynamic and static mating surfaces after shutdown, resulting in ice blocking during the low-temperature restart process. In addition, the bidirectional spiral seal structure is combined with the high torque and positive and negative vibration startup strategy of the anti-rotation groove 2120 and the anti-rotation gear 2320 to solve the problem of low-temperature ice breaking startup of the hydrogen circulation pump.

[0072] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0073] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. A hydrogen circulation pump, characterized in that: It comprises a housing assembly and a shaft system assembly arranged in the housing assembly; The shaft system assembly includes an impeller and a rotor shaft, wherein the impeller is provided with an assembly hole along the center line, a plurality of anti-rotation grooves are provided in the circumferential direction of the assembly hole, and anti-rotation teeth are provided on the outer circumferential surface of the rotor shaft corresponding to the anti-rotation grooves, and when the rotor shaft is matched with the assembly hole, the anti-rotation teeth are matched with the corresponding anti-rotation grooves, so that the rotor shaft and the impeller rotate synchronously; The width of the anti-rotation groove gradually decreases along the direction away from the center line of the impeller, and the anti-rotation groove includes a first side wall surface and a second side wall surface. The extension direction of the first side wall surface passes through the center line of the impeller, and the second side wall surface is an arcuate surface. One end of the second side wall surface merges with the end of the first side wall surface, and the other end of the second side wall surface is tangent to the assembled inner wall, and the second side wall surface is recessed toward the outer edge of the impeller.

2. The hydrogen circulation pump according to claim 1, characterized in that: The spiral direction of the plurality of anti-rotation grooves is consistent with the rotation direction of the rotor shaft, and the anti-rotation teeth are adapted to the anti-rotation grooves.

3. The hydrogen circulation pump according to claim 1, characterized in that: The rotor shaft and the housing assembly are rotationally matched, and a bidirectional spiral sealing structure is provided at the matching position between the rotor shaft and the housing assembly.

4. The hydrogen circulation pump according to claim 3, characterized in that: The rotor shaft is provided with a reverse spiral groove on its outer cylindrical surface corresponding to the housing assembly, and the housing assembly is provided with a forward spiral groove corresponding to the reverse spiral groove.

5. The hydrogen circulation pump according to claim 1, characterized in that: The impeller is fixedly connected to the rotor shaft via a locking member.

6. The hydrogen circulation pump according to claim 1, characterized in that: A blade group is arranged on the side of the impeller facing away from the anti-rotation groove, and the blade group includes long blades and short blades distributed at circumferential intervals along the center line of the impeller.

7. The hydrogen circulation pump according to claim 1, characterized in that: The housing assembly comprises a pump housing body and a motor housing, wherein the pump housing body is sealed and matched with the motor housing, wherein the pump housing body is provided with an inlet and outlet flow adapter, and the motor housing is provided with a cooling and heat dissipation structure.

8. The hydrogen circulation pump according to claim 7, characterized in that: The cooling and heat dissipation structure includes a water cooling channel arranged in the motor housing and / or heat dissipation fins arranged on the surface of the motor housing.

9. The hydrogen circulation pump according to claim 1, characterized in that: The hydrogen circulation pump further includes a stator assembly, which is disposed in the housing assembly. A rotor magnet is disposed on the rotor shaft corresponding to the stator assembly, and the stator assembly and the rotor magnet are magnetically matched.

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