Impurity collection and storage structure of hydrogen circulating pump

Abstract

The invention belongs to an impurity collection and storage structure of a hydrogen circulating pump in the technical field of hydrogen circulating pumps. A dirt storage chamber (5) is arranged in the shell body (10), a bearing hole (8) and an air seal hole (9) are formed in an inner ring of a protruding part (11), a dirt storage chamber inlet (7) is formed between the inner wall of the bearing hole (8) and the inner wall of the air seal hole (9), the dirt storage chamber inlet (7) is of an annular groove structure and is communicated with the dirt storage chamber (5) through a channel (6), and the horizontal height of the dirt storage chamber (5) is smaller than that of the dirt storage chamber inlet (7). According to the impurity collecting and storing structure of the hydrogen circulating pump, impurities generated by abrasion such as air sealing in the running process of the hydrogen circulating pump can be effectively collected, and the reliability and stability of the pump are improved; meanwhile, impurities can be separated from hydrogen, the purity of the hydrogen is kept, and normal operation of the system is ensured; pollutant accumulation in the pump is reduced, and a clean working environment is provided for parts of the pump.

Description

Technical Field

[0001] The invention belongs to the technical field of hydrogen circulation pumps, and more specifically, relates to an impurity collection and storage structure of a hydrogen circulation pump. Background Art

[0002] The hydrogen circulation pump is mainly used to pressurize and reuse the hydrogen-containing mixed gas discharged from the fuel cell, among which the pump head is the main pressurizing component. During the operation of the hydrogen circulation pump, some impurities, particulate matter, and possible oil pollution and other pollutants will inevitably be generated. If these impurities cannot be effectively collected and treated, they may enter the pump body, affecting the normal operation of the hydrogen circulation pump and reducing its working efficiency and service life. In addition, the presence of impurities may also damage other precision components in the pump, further increasing the risk of equipment failure.

[0003] The following are some of the current status of impurity contaminant collection technology inside hydrogen circulation pumps:

[0004] Filtration technology: Filter filtration: Setting filters at the inlet or key internal parts of the hydrogen circulation pump is a common way to filter impurities. These filters are usually made of metal or special synthetic materials, with a certain pore size, and can intercept larger particles of impurities, such as dust, metal debris, etc. However, filter filtration has certain limitations, and the filtering effect on tiny particles may be limited, and the filter is easily clogged and needs to be cleaned or replaced regularly.

[0005] Filter element filtration: Filter element filtration is another important filtration technology. Filter elements are usually made of fiber materials, porous ceramics, etc., and have a more sophisticated filtration structure, which can effectively remove tiny particles, oil and other impurities in hydrogen. Compared with the filter screen, the filter element has higher filtration accuracy, but it also faces the problem of clogging and the need for regular replacement. In order to improve the service life and filtration efficiency of the filter element, some advanced filter elements use special surface treatment technology or multi-layer composite structure.

[0006] Electrostatic adsorption technology: By setting up an electrostatic field inside the hydrogen circulation pump, the impurity particles are charged and adsorbed onto electrodes or adsorption materials with opposite charges. Electrostatic adsorption technology can effectively remove tiny particles in hydrogen, especially for some fine dust and electrostatic impurities that are difficult to remove by physical filtration. However, this technology requires a stable power supply and precise electric field control. At the same time, the adsorption material may be saturated after long-term use and needs to be cleaned or replaced regularly to ensure the adsorption effect.

[0007] Magnetic adsorption technology: Magnetic adsorption is used to collect magnetic impurities that may exist in hydrogen, such as ferromagnetic particles. Magnetic materials, such as magnets or magnetic filters, are installed at specific locations on the hydrogen circulation pump to attract magnetic impurities using magnetic force, thereby achieving separation and collection of impurities. Magnetic adsorption technology is effective in removing magnetic impurities, but it is powerless against non-magnetic impurities, and the adsorption capacity of magnetic materials will gradually weaken over time, requiring regular inspection and maintenance.

[0008] Regular maintenance and cleaning: In addition to the above-mentioned impurity collection technology, it is also very important to regularly maintain and clean the hydrogen circulation pump. This includes disassembling the hydrogen circulation pump, inspecting and cleaning the various internal components, and removing the accumulated impurities and dirt. For example, for some parts that are prone to impurities accumulation, such as the impeller surface and the inside of the pump casing, regular cleaning can maintain the good operating condition of the hydrogen circulation pump. At the same time, during the maintenance process, worn or damaged parts can be discovered and replaced in time to avoid the generation and leakage of impurities due to component failure. In addition, some hydrogen circulation pumps are also equipped with an online monitoring system to monitor the content and accumulation of impurities in the pump in real time so that maintenance measures can be taken in time.

[0009] In the prior art, there is a technology named "a hydrogen circulation pump device driven by pressure energy for a hydrogen fuel cell vehicle" and with a publication (announcement) number of "CN107634245A". The technology provides a hydrogen circulation pump device driven by pressure energy suitable for a hydrogen fuel cell vehicle, comprising: an expansion-compression integrated machine (7), wherein the expansion-compression integrated machine (7) comprises a hydrogen expander (1) and a hydrogen pump (4). High-pressure hydrogen enters the expander (1) to reduce pressure, and at the same time outputs expansion work W to the outside, and the expansion work W directly drives the hydrogen pump (4); the hydrogen that has not completely reacted in the fuel cell (3) is recycled and reused under the drive of the hydrogen pump (4); the present invention proposes that the expansion-compression integrated machine (7) uses the pressure energy stored in the high-pressure hydrogen to drive the hydrogen circulation pump, thereby overcoming the leakage and lubricating oil pollution problems of the traditional motor-driven hydrogen circulation pump, while recycling the pressure energy of the high-pressure hydrogen, and improving the energy utilization rate of the fuel cell vehicle.

[0010] However, this technology does not involve the technical problems and technical solutions of the present application. Summary of the invention

[0011] The technical problem to be solved by the present invention is: in view of the deficiencies in the prior art, a hydrogen circulation pump impurity collection and storage structure with a simple structure is provided, which can effectively collect impurities generated by wear of gas seals and the like during the operation of a hydrogen circulation pump, prevent impurities from entering key parts of the pump, and improve the reliability and stability of the pump; at the same time, impurities can be separated from hydrogen to maintain the purity of hydrogen and ensure the normal operation of the system; the accumulation of pollutants inside the pump is reduced, a clean working environment is provided for the components of the pump, the wear and corrosion rate of the components is reduced, and the service life of the pump is extended.

[0012] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is:

[0013] The present invention discloses an impurity collection and storage structure for a hydrogen circulation pump. The shell comprises a shell body and a protrusion. A dirt storage chamber is arranged in the shell body. An air seal hole and a bearing hole are arranged on the inner ring of the protrusion. An entrance to the storage chamber is arranged between the inner wall of the air seal hole and the inner wall of the bearing hole. The entrance to the storage chamber is an annular groove structure arranged along a half circumference of the inner wall of the protrusion. The entrance to the dirt storage chamber is connected to the dirt storage chamber through a channel. The horizontal height of the storage chamber is lower than the horizontal height of the entrance to the storage chamber. An outlet of the dirt storage chamber is arranged on the outer ring of the dirt storage chamber. A step portion is arranged at the outlet of the storage chamber. A sealing cover plate is buckled at the position of the step portion.

[0014] The shell body and the protruding portion are in a T-shaped structure.

[0015] A sealing gasket is provided at the step portion of the storage chamber outlet.

[0016] The thickness of the cover plate and the sealing gasket is less than or equal to the depth of the step portion.

[0017] The dirt storage chamber is located near one side of the shell body.

[0018] The passage is connected to the dirt storage chamber at an angle from the entrance of the dirt storage chamber, and the dirt storage chamber extends and passes through a side surface of the shell body.

[0019] The bearing hole of the inner ring of the protruding part is close to the end of the protruding part, and the air sealing hole of the inner ring of the protruding part is close to one side of the shell body.

[0020] The sealing cover plate and the sealing gasket are both rectangular structures, and the screws pass through the sealing cover plate and the sealing gasket and are connected with the screw holes at the step portion.

[0021] When the hydrogen circulation pump is working, the shell body of the shell is located below the protruding part, and the shell body and the protruding part are an integrated structure.

[0022] The technical solution of the present invention is adopted, and the working principle and beneficial effects are as follows:

[0023] The impurity collection and storage structure of the hydrogen circulation pump described in the present invention, the hydrogen circulation pump includes a shell, and when the structure is set, the shell includes a shell body and a protrusion, and the shell body and the protrusion form an integrated shell. When the shell is processed, a dirt storage chamber is set in the shell body. The dirt storage chamber is a cavity structure, which can realize both the collection and storage of impurities. The inner ring of the protrusion is provided with a gas seal hole and a bearing hole. The gas seal hole and the bearing hole are the main parts for the generation and passage of impurities, and the dirt storage chamber entrance is set between the inner wall of the gas seal hole and the inner wall of the bearing hole. The dirt storage chamber entrance is an annular groove structure. The setting of the dirt storage chamber entrance of the annular groove structure is used for impurities to enter, and the impurities then enter the channel and then enter the dirt storage chamber. The dirt storage chamber entrance is connected to the dirt storage chamber through the channel, and the horizontal height of the storage chamber is lower than the horizontal height of the storage chamber entrance. In this way, the impurities enter the dirt storage chamber located at a low position through the channel from the dirt storage chamber entrance located at a high position, ensuring that the impurities effectively enter the dirt storage chamber. The outer ring of the dirt storage chamber is provided with a dirt storage chamber outlet, and a step portion is provided at the storage chamber outlet, and a sealing cover plate is buckled at the step portion. When it is necessary to clean the impurities in the dirt storage chamber, the sealing cover plate is opened, and after cleaning the impurities, the sealing cover plate is reinstalled. The dirt storage chamber is located on the side of the shell, and the effective space of the shell is reasonably utilized to effectively collect impurities generated by wear of the gas seal during the operation of the hydrogen circulation pump. The entrance of the dirt storage chamber is an open groove structure, which is located between the gas seal hole and the bearing hole in the shell, and the entrance of the dirt storage chamber is connected to the dirt storage chamber through a channel. The channel is inclined downward from the gas seal hole and the bearing hole position of the shell to the direction of the dirt storage chamber, and the impurities enter the dirt storage chamber located at a low position through the channel from the entrance of the dirt storage chamber located at a high position, and the impurities are naturally precipitated into the dirt storage chamber by gravity, ensuring that the impurities flow smoothly into the dirt storage chamber. The entrance of the dirt storage chamber is set as an annular groove structure, which is convenient for the processing of the channel, and it is convenient for impurities in different parts to first enter the entrance of the dirt storage chamber 7, then enter the channel, and then flow into the dirt storage chamber. The above structure is simple in structure and easy to process; the design is reasonable and does not affect the overall appearance and installation space of the hydrogen circulation pump; the position of the dirt storage chamber is at the lowest position in the hydrogen circulation pump, and the impurities are naturally precipitated into the dirt storage chamber by gravity; the chamber shape of the dirt storage chamber is set to a structure with a narrow inside and a wide outside according to the shell shape, and the bottom of the dirt storage chamber is opened by a channel, and the channel is connected to the entrance of the dirt storage chamber located between the gas seal hole and the bearing hole of the shell, which is convenient for collecting gas seal wear impurities and solid and liquid pollutants such as water vapor, avoiding impurities from damaging the bearings, and improving the reliability and stability of the hydrogen circulation pump. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The following is a brief description of the contents and symbols in the drawings of this specification:

[0025] Figure 1 This is a structural schematic diagram of the impurity collection and storage structure of the hydrogen circulation pump according to the present invention;

[0026] Figure 2 This is a schematic cross-sectional view of the impurity collection and storage structure of the hydrogen circulation pump according to the present invention;

[0027] Figure 3 It is a partial structural schematic diagram of the impurity collection and storage structure of the hydrogen circulation pump according to the present invention;

[0028] Figure 4 It is a partial structural schematic diagram of the impurity collection and storage structure of the hydrogen circulation pump according to the present invention;

[0029] The markings in the accompanying drawings are respectively: 1, sealing cover plate; 2, sealing gasket; 3, shell; 4, sewage storage chamber outlet; 5, sewage storage chamber; 6, passage; 7, storage chamber entrance; 8, bearing hole; 9, air sealing hole; 10, shell body; 11, protrusion; 12, step portion. DETAILED DESCRIPTION

[0030] The following is a further detailed description of the specific implementation of the present invention, such as the shape, structure, mutual position and connection relationship between the various components involved, the function and working principle of each part, etc., through the description of the embodiments with reference to the accompanying drawings:

[0031] As attached Figure 1 -Attached Figure 4As shown, the present invention is a hydrogen circulation pump impurity collection and storage structure, the shell 3 includes a shell body 10 and a protrusion 11, a dirt storage chamber 5 is arranged in the shell body 10, a bearing hole 8 and an air seal hole 9 are arranged in the inner ring of the protrusion 11, a dirt storage chamber inlet 7 is arranged between the inner wall of the bearing hole 8 and the inner wall of the air seal hole 9, the dirt storage chamber inlet 7 is an annular groove structure, the dirt storage chamber inlet 7 is connected to the dirt storage chamber 5 through a channel 6, the horizontal height of the dirt storage chamber 5 is lower than the horizontal height of the dirt storage chamber inlet 7, the dirt storage chamber 5 is arranged with a dirt storage chamber outlet 4 in the outer ring, the storage chamber outlet 4 is provided with a step 12, and the step 12 position is buckled with a sealing cover plate 1. The above structure proposes an improved technical solution for the deficiencies in the prior art. The hydrogen circulation pump includes a shell 3, when the structure is set, the shell 3 includes a shell body 10 and a protrusion 11, and the shell body 10 and the protrusion 11 form an integrated shell 3. When the shell 3 is processed, a dirt storage chamber 5 is set in the shell body 10. The dirt storage chamber 5 is a cavity structure, which can collect and store impurities. The inner circle of the protrusion 11 is provided with a bearing hole 8 and an air seal hole 9. The bearing hole 8 and the air seal hole 9 are the main parts where impurities are generated and pass through. The dirt storage chamber entrance 7 is set between the inner wall of the bearing hole 8 and the inner wall of the air seal hole 9. The dirt storage chamber entrance 7 is an annular groove structure. The setting of the storage chamber entrance 7 of the annular groove structure is used for impurities to enter, and then the impurities enter the channel and then enter the dirt storage chamber 5. The dirt storage chamber entrance 7 is connected to the dirt storage chamber 5 through the channel 6. The horizontal height of the storage chamber 5 is lower than the horizontal height of the storage chamber entrance 7. In this way, the impurities enter the dirt storage chamber 5 located at a lower position from the dirt storage chamber entrance 7 located at a higher position through the channel 6, ensuring that the impurities effectively enter the dirt storage chamber 5. The outer ring of the dirt storage chamber 5 is provided with a dirt storage chamber outlet 4, and the storage chamber outlet 4 is provided with a step portion 12, and the sealing cover plate 1 is buckled at the step portion 12. When it is necessary to clean the impurities in the dirt storage chamber 5, open the sealing cover plate, clean the impurities, and then reinstall the sealing cover plate. The dirt storage chamber is located on the side of the shell, and the effective space of the shell is reasonably utilized to effectively collect impurities generated by wear of the gas seal during the operation of the hydrogen circulation pump. The dirt storage chamber inlet 7 is an open groove structure, located between the gas seal hole and the bearing hole in the shell 3, and the dirt storage chamber inlet 7 is connected to the dirt storage chamber through a channel 6. The channel 6 is arranged downwardly from the bearing hole 8 and the gas seal hole 9 of the shell 3 to the direction of the dirt storage chamber 5, and the impurities enter the dirt storage chamber 5 located at a low position from the dirt storage chamber inlet 7 located at a high position through the channel 6, and the impurities are naturally precipitated into the dirt storage chamber 5 by gravity, ensuring that the impurities flow smoothly into the dirt storage chamber 5. The dirt storage chamber inlet 7 is configured as an annular groove structure, which is convenient for processing the channel 6 and for impurities in different parts to first enter the dirt storage chamber inlet 7 , then enter the channel 6 , and then flow into the dirt storage chamber 5 .The above structure is simple in structure and easy to process; the design is reasonable and does not affect the overall appearance and installation space of the hydrogen circulation pump; the dirt storage chamber 5 is located at the lowest position in the hydrogen circulation pump, and the impurities are naturally precipitated into the dirt storage chamber 5 by gravity; the chamber shape of the dirt storage chamber 5 is set to a structure with a narrow inside and a wide outside according to the shell shape, and the bottom of the dirt storage chamber 5 is opened by a channel 6, and the channel 6 is connected to the dirt storage chamber inlet 7 located between the bearing hole 8 and the gas seal hole 9 of the shell 3, which is convenient for collecting gas seal wear impurities and solid and liquid pollutants such as water vapor, avoiding impurities from damaging the bearings, and improving the reliability and stability of the hydrogen circulation pump. The impurity collection and storage structure of the hydrogen circulation pump described in the present invention has a simple structure, can effectively collect impurities generated by wear of the air seal and the like during the operation of the hydrogen circulation pump, prevent the impurities from entering the key parts of the pump, and improve the reliability and stability of the pump; in addition, the dirt storage chamber structure can separate the impurities from the hydrogen, maintain the purity of the hydrogen, and ensure the normal operation of the system; by collecting and storing impurities, the dirt storage chamber can reduce the accumulation of pollutants inside the pump, provide a clean working environment for the components of the pump, help reduce the wear and corrosion rate of the components, and extend the service life of the circulation pump.

[0032] The shell body 10 and the protrusion 11 are in a T-shaped structure. In the above structure, the shell 3 is an integrally processed structure, which has a simple processing technology and low processing cost. The dirt storage chamber 5 is set at the position of the shell body 10, and the protrusion 11 is used to set the bearing hole 8 and the air seal hole 9.

[0033] The step portion 12 of the storage chamber outlet 4 is provided with a sealing gasket 2. In the above structure, the dirt storage chamber 5 is sealed by the sealing gasket 2 and the sealing cover plate 1, and is convenient for disassembly, inspection and cleaning.

[0034] The thickness of the sealing cover plate 1 and the sealing gasket 2 is ≤ the depth of the step portion 12. In the above structure, the sealing cover plate 1 and the sealing gasket 2 do not exceed the size boundary of the shell side wall after installation, that is, they will not protrude from the side of the shell 3, and will not affect the overall appearance and installation space of the hydrogen circulation pump.

[0035] The dirt storage chamber 5 is located near one side of the housing body 10. In the above structure, the dirt storage chamber 5 is arranged by utilizing the structure of the housing 3 itself, and does not occupy additional space.

[0036] The passage 6 is connected to the dirt storage chamber 5 at an angle from the dirt storage chamber entrance 7, and the dirt storage chamber 5 extends and passes through one side of the housing body 10. In the above structure, the passage 6 is arranged at an angle, the dirt storage chamber entrance 7 is located at a high position, and the dirt storage chamber 5 is located at a low position, which is convenient for impurities to flow in.

[0037] The bearing hole 8 of the inner ring of the protrusion 11 is close to the end of the protrusion 11, and the air seal hole 9 of the inner ring of the protrusion 11 is close to one side of the shell body 10. In the above structure, the dirt storage chamber inlet 7 is recessed along the half circumference of the inner ring of the protrusion 11 and is located between the bearing hole 8 and the air seal hole 9, so that impurities at the positions of the bearing hole 8 and the air seal hole 9 can enter the dirt storage chamber inlet 7.

[0038] The sealing cover plate 1 and the sealing gasket 2 are both rectangular structures, and the screws pass through the sealing cover plate 1 and the sealing gasket 2 and are connected to the screw holes at the step portion 12. When the hydrogen circulation pump is working, the shell body 10 of the shell 3 is located below the protrusion 11, and the shell body 10 and the protrusion 11 are an integrated structure. In the above structure, the sealing cover plate 1 fits the sealing gasket 2, and the edge of the sealing gasket rests on the step portion 12, and then the bolts can reliably connect the sealing cover plate.

[0039] The impurity collection and storage structure of the hydrogen circulation pump of the present invention comprises a housing 3, the housing 3 comprises a housing body 10 and a protrusion 11, and the housing body 10 and the protrusion 11 form an integrated housing 3. When the housing 3 is processed, a dirt storage chamber 5 is arranged in the housing body 10, and the dirt storage chamber 5 is a cavity structure, which can realize both the collection and storage of impurities. The inner ring of the protrusion 11 is provided with a bearing hole 8 and an air seal hole 9, and the bearing hole 8 and the air seal hole 9 are the main parts for generating and passing impurities, and the dirt storage chamber inlet 7 is arranged between the inner wall of the bearing hole 8 and the inner wall of the air seal hole 9, and the dirt storage chamber inlet 7 is an annular groove structure, and the setting of the dirt storage chamber inlet 7 of the annular groove structure is used for impurities to enter, and the impurities then enter the channel, and then enter the dirt storage chamber 5. The dirt storage chamber inlet 7 is connected to the dirt storage chamber 5 through the channel 6, and the level of the dirt storage chamber 5 is lower than the level of the dirt storage chamber inlet 7. In this way, impurities enter the low-positioned pollutant storage chamber 5 from the high-positioned pollutant storage chamber entrance 7 through the channel 6, ensuring that the impurities effectively enter the pollutant storage chamber 5. The pollutant storage chamber outlet 4 is arranged on the outer ring of the pollutant storage chamber 5, and the storage chamber outlet 4 is arranged on a step portion 12, and the sealing cover plate 1 is buckled on the step portion 12. When it is necessary to clean the impurities in the pollutant storage chamber 5, the sealing cover plate is opened, and the sealing cover plate is reinstalled after cleaning the impurities. The pollutant storage chamber is located on the side of the shell, and the effective space of the shell is reasonably utilized to effectively collect impurities generated by wear of the air seal during the operation of the hydrogen circulation pump. The pollutant storage chamber entrance 7 is an open groove structure, which is located between the air seal hole and the bearing hole in the shell 3, and the pollutant storage chamber entrance 7 is connected to the pollutant storage chamber through the channel 6. The channel 6 is arranged obliquely downward from the bearing hole 8 and the air seal hole 9 of the housing 3 toward the direction of the dirt storage chamber 5. Impurities enter the dirt storage chamber 5 located at a lower position through the channel 6 from the dirt storage chamber inlet 7 located at a higher position, and the impurities are naturally precipitated into the dirt storage chamber 5 by gravity, ensuring that the impurities flow smoothly into the dirt storage chamber 5. The dirt storage chamber inlet 7 is an annular groove structure, which is convenient for the processing of the channel 6, and it is convenient for impurities in different parts to first enter the dirt storage chamber inlet 7, then enter the channel 6, and then flow into the dirt storage chamber 5. The above structure is simple in structure and easy to process; the design is reasonable and does not affect the overall appearance and installation space of the hydrogen circulation pump; the dirt storage chamber 5 is located at the lowest position in the hydrogen circulation pump, and the impurities are naturally precipitated into the dirt storage chamber 5 by gravity; the chamber shape of the dirt storage chamber 5 is set to a structure with a narrow inside and a wide outside according to the shell shape, and the bottom of the dirt storage chamber 5 is opened by a channel 6, and the channel 6 is connected to the dirt storage chamber inlet 7 located between the bearing hole 8 and the gas seal hole 9 of the shell 3, which is convenient for collecting gas seal wear impurities and solid and liquid pollutants such as water vapor, avoiding impurities from damaging the bearings, and improving the reliability and stability of the circulation pump.

[0040] The present invention is described above by way of example in conjunction with the accompanying drawings. It is obvious that the specific implementation of the present invention is not limited to the above-mentioned method. As long as various improvements are made using the method concept and technical solution of the present invention, or the concept and technical solution of the present invention are directly applied to other occasions without improvement, they are all within the protection scope of the present invention.

Claims

1. A hydrogen circulation pump impurity collection and storage structure, characterized in that: The housing (3) comprises a housing body (10) and a protruding portion (11). A dirt storage chamber (5) is arranged in the housing body (10). A bearing hole (8) and an air seal hole (9) are arranged on the inner ring of the protruding portion (11). A dirt storage chamber inlet (7) is arranged between the inner wall of the bearing hole (8) and the inner wall of the air seal hole (9). The dirt storage chamber inlet (7) is an annular groove structure. The dirt storage chamber inlet (7) is connected to the dirt storage chamber (5) through a channel (6). The horizontal height of the storage chamber (5) is lower than the horizontal height of the storage chamber inlet (7). A dirt storage chamber outlet (4) is arranged on the outer ring of the dirt storage chamber (5). A step portion (12) is arranged on the storage chamber outlet (4). A sealing cover plate (1) is buckled at the step portion (12).

2. The impurity collection and storage structure for a hydrogen circulation pump according to claim 1, characterized in that: The shell body (10) and the protruding portion (11) are in a T-shaped structure.

3. The impurity collection and storage structure for a hydrogen circulation pump according to claim 1 or 2, characterized in that: A sealing gasket (2) is provided on the step portion (12) of the dirt storage chamber outlet (4).

4. The impurity collection and storage structure for a hydrogen circulation pump according to claim 1 or 2, characterized in that: The thickness of the cover plate (1) and the sealing gasket (2) is less than or equal to the depth of the step portion (12).

5. The impurity collection and storage structure for a hydrogen circulation pump according to claim 1 or 2, characterized in that: The dirt storage chamber (5) is located near a side surface of the housing body (10).

6. The impurity collection and storage structure for a hydrogen circulation pump according to claim 1 or 2, characterized in that: The passage (6) is connected to the dirt storage chamber (5) at an angle from the dirt storage chamber entrance (7), and the dirt storage chamber (5) extends and passes through a side surface of the housing body (10).

7. The impurity collection and storage structure for a hydrogen circulation pump according to claim 1 or 2, characterized in that: The bearing hole (8) of the inner ring of the protrusion (11) is close to the end of the protrusion (11), and the air sealing hole (9) of the inner ring of the protrusion (11) is close to one side of the shell body (10).

8. The impurity collection and storage structure for a hydrogen circulation pump according to claim 1 or 2, characterized in that: The sealing cover plate (1) and the sealing gasket (2) are both rectangular structures, and screws pass through the sealing cover plate (1) and the sealing gasket (2) to connect with the screw holes at the step portion (12).

9. The impurity collection and storage structure for a hydrogen circulation pump according to claim 1 or 2, characterized in that: When the hydrogen circulation pump is working, the shell body (10) of the shell (3) is located below the protruding portion (11), and the shell body (10) and the protruding portion (11) are an integrated structure.

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