Runner structure of hydrogen circulating pump

Abstract

The invention belongs to a hydrogen circulating pump runner structure in the technical field of hydrogen circulating pumps. The first shell flow channel (13) comprises a first inner ring (14) and a first outer ring (15), the first outer ring (15) is provided with a first convex part (16), the second shell flow channel (31) comprises a second inner ring (32) and a second outer ring (33), the second outer ring (33) is provided with a second convex part (34), a first shell first fit clearance (Ga) is formed between the first convex part (16) and the outer diameter of the impeller (2), and a second shell second fit clearance (Ga) is formed between the first convex part (16) and the outer diameter of the impeller (2). A gap between the first outer ring (15) and the outer diameter of the impeller (2) is a second fit clearance (Gb) of the first shell, and the first fit clearance (Ga) of the first shell ranges from 0.15 mm to 0.4 mm. The flow channel structure of the hydrogen circulating pump is simple in structure, under the condition that the appearance change is small, the flow of the hydrogen pump is effectively increased, the flow resistance is reduced, the shell rubbing risk of the impeller and the flow channel is reduced, the high-performance flow channel structure is achieved, meanwhile, due to the fact that the fit clearance is changed, the finish machining face is reduced, and the machining cost and time are reduced.

Description

Technical Field

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

[0002] The hydrogen circulation pump is one of the core components of the proton exchange membrane fuel cell (PEMFC) engine. The pressure regulation, drainage, exhaust and humidification of the fuel cell hydrogen supply system have an important impact on improving the performance and life of the proton exchange membrane fuel cell. The core component of the hydrogen supply system is the hydrogen circulation pump. The hydrogen at the tail exhaust end of the stack is re-pressurized to the inlet end of the stack through the hydrogen circulation pump, realizing the recycling of hydrogen. The hydrogen circulation pump generally includes a pump head and a motor. The pump head includes an upper shell, a lower shell and an impeller. The flow channel on the shell and the impeller form a chamber for compressed gas. Its main characteristics are that the motor drives the impeller to rotate, and the gas enters the air cavity from the inlet. On the one hand, it performs circular motion under the action of the radial impeller rotation; on the other hand, it moves tangentially along the outer edge of the impeller to the side flow channel under the action of centrifugal force, and then enters the impeller from the inner diameter of the side flow channel; this movement is repeated many times and finally flows out from the outlet; With the development of fuel cell vehicles, the output power of fuel cell reactors is further improved, requiring hydrogen pumps to have higher flow, smaller flow resistance, and smaller external volume, which poses new challenges to designers.

[0003] In the prior art, there is a technology named "single-sided double-channel two-stage pressurized hydrogen circulation pump" and the publication (announcement) number is "CN216429980U". This technology relates to a single-sided double-channel two-stage pressurized hydrogen circulation pump, which belongs to the technical field of hydrogen circulation pumps, and includes an outer shell, an impeller and a driver; a sealed cavity is arranged in the outer shell, and the output end of the driver extends into the sealed cavity and is connected to the impeller drive, and the impeller rotates under the drive of the driver; at least two mutually connected flow channels are arranged in the sealed cavity, and at least two mutually connected flow channels are arranged on the same side of the impeller, and the two ends of the flow channels are respectively connected with an outlet and an inlet. The single-sided double-channel two-stage pressurized hydrogen circulation pump described in the utility model has high pressurization efficiency.

[0004] However, this technology does not involve the technical problems and technical solutions of the present application. Summary of the invention

[0005] The technical problem to be solved by the present invention is: in view of the shortcomings of the prior art, a hydrogen circulation pump flow channel structure with a simple structure is provided, which can effectively increase the flow rate of the hydrogen pump, reduce the flow resistance, reduce the risk of impeller and flow channel rubbing, and realize a high-performance flow channel structure with a small change in appearance. At the same time, due to the change in the fitting clearance, the finishing surface is reduced, and the processing cost and time are reduced.

[0006] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is:

[0007] The present invention discloses a flow channel structure of a hydrogen circulation pump. An impeller is arranged between a first shell and a second shell. A first shell flow channel is arranged on the inner wall of the first shell, and a second shell flow channel is arranged on the inner wall of the second shell. The first shell flow channel is an annular structure. The first shell flow channel comprises a first inner ring and a first outer ring. A first convex portion is arranged on the first outer ring. The second shell flow channel comprises a second inner ring and a second outer ring. A second convex portion is arranged on the second outer ring. A first fitting clearance of the first shell is formed between the first convex portion and an outer diameter of the impeller. A clearance between the first outer ring and an outer diameter of the impeller is a second fitting clearance of the first shell. The range of the first fitting clearance of the first shell is between 0.15 mm and 0.4 mm.

[0008] The first matching clearance of the second shell is in the range of 0.15 mm to 0.4 mm.

[0009] The second fitting clearance of the first housing is in the range of 1.5 mm to 3 mm.

[0010] The second fitting clearance of the second housing is in the range of 1.5 mm to 3 mm.

[0011] The first inner ring of the first shell flow channel is provided with a first through portion connected to the first outer ring, and the first through portion is aligned with the first boss; the second inner ring of the second shell flow channel is provided with a second through portion connected to the second outer ring, and the second through portion is aligned with the second boss.

[0012] An air inlet and an air outlet are arranged on the outer side of the first shell.

[0013] The first protrusion of the first shell is located between the air inlet and the air outlet.

[0014] The gas enters the first shell flow channel from the air inlet, and under the action of the impeller rotation, the gas performs circular motion. The main area of ​​the gas is the second fitting gap of the first shell formed by the outer diameter of the impeller and the first outer ring of the first shell flow channel. At the same time, the gas enters the impeller from the first shell flow channel under the action of centrifugal force, moves to the second shell flow channel after being accelerated by the impeller, enters the impeller after being compressed in the second shell flow channel and returns to the first shell flow channel. This movement is repeated many times and finally flows out from the air outlet.

[0015] The first shell and the second shell are connected by bolts, and a sealing gasket is arranged between the first shell and the second shell.

[0016] The impeller is connected to the first shell and the second shell via a rotating shaft, and the rotating shaft is connected to the driving motor.

[0017] The technical solution of the present invention is adopted, and the working principle and beneficial effects are as follows:

[0018] The hydrogen circulation pump flow channel structure of the present invention, when the structure is set, an impeller is arranged between the first shell and the second shell, so as to form a working chamber between the first shell and the second shell, and the first gap of the first shell is the smaller one of the matching of the first shell flow channel and the impeller, ranging from 0.15mm to 0.4mm; the first gap of the first shell is located between the air inlet and the air outlet, and the first gap of the first shell plays a major sealing role to prevent high-pressure gas from leaking from the air outlet to the air inlet; the second matching gap of the first shell is the larger one of the matching of the first shell flow channel and the impeller, and the range of the second matching gap of the first shell is between 1.5mm and 3mm. Driven by the impeller, the gas enters the first shell flow channel from the air inlet, and on the one hand, it performs circular motion under the rotation of the impeller, and the main area of ​​the gas is the gap formed by the outer diameter of the impeller and the second gap of the first shell and the second gap of the second shell; on the other hand, under the action of centrifugal force, the gas enters the impeller from the first shell flow channel, accelerates through the impeller to the second shell flow channel, enters the impeller after being compressed in the second flow channel and returns to the first flow channel, repeats the movement many times, and finally flows out from the air outlet. The two-stage matching scheme structure with the first matching gap + the second matching gap can greatly increase the outer diameter of the flow channel, increase the flow channel volume, make more airflow move in a circle along the second matching gap, and maintain the high-speed advantage that has been obtained, reduce the gas flow rate loss, increase the outlet flow rate, and reduce the flow resistance at the same time; the flow channel with two-stage matching has obvious processing cost advantages. The first matching gap is the main sealing area, which requires higher precision processing requirements, while the processing accuracy level of the remaining areas can be lowered, which can greatly shorten the overall processing time and reduce processing costs; the flow channel with two-stage matching has obvious structural advantages, avoiding the risk of impeller rubbing due to installation or shaft deviation, and improving the overall stability of the hydrogen pump. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The following is a brief description of the contents and symbols in the drawings of this specification:

[0020] Figure 1 It is a structural schematic diagram of the flow channel structure of the hydrogen circulation pump according to the present invention;

[0021] Figure 2 It is a structural schematic diagram of the first shell of the flow channel structure of the hydrogen circulation pump according to the present invention;

[0022] Figure 3 It is a schematic structural diagram of the first housing of the flow channel structure of the hydrogen circulation pump of the present invention when it cooperates with the impeller;

[0023] Figure 4 It is a schematic diagram of the partial structure of the first housing of the flow channel structure of the hydrogen circulation pump of the present invention when it cooperates with the impeller;

[0024] Figure 5 It is a schematic diagram of the partial structure of the second housing of the flow channel structure of the hydrogen circulation pump of the present invention when it cooperates with the impeller;

[0025] Marked as follows in the accompanying drawings: 1. first shell; 11. air inlet; 12. air outlet; 13. first shell flow channel; 14. first inner ring; 15. first outer ring; 16. first convex portion; 17. first through-portion; 2. impeller; 21. rotating shaft; 3. second shell; 31. second shell flow channel; 32. second inner ring; 33. second outer ring; 34. second convex portion; 35. second through-portion. DETAILED DESCRIPTION

[0026] 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:

[0027] As attached Figure 1 -Attached Figure 5As shown, the present invention is a flow channel structure of a hydrogen circulation pump, wherein an impeller 2 is arranged between a first shell 1 and a second shell 3, a first shell flow channel 13 is arranged on the inner wall of the first shell 1, and a second shell flow channel 31 is arranged on the inner wall of the second shell 3, the first shell flow channel 13 is an annular structure, the first shell flow channel 13 comprises a first inner ring 14 and a first outer ring 15, the first outer ring 15 is provided with a first convex portion 16, the second shell flow channel 31 comprises a second inner ring 32 and a second outer ring 33, the second outer ring 33 is provided with a second convex portion 34, the first convex portion 16 and the outer diameter of the impeller 2 are the first matching clearance Ga of the first shell, the clearance between the first outer ring 15 and the outer diameter of the impeller 2 is the second matching clearance Gb of the first shell, and the range of the first matching clearance Ga of the first shell is between 0.15mm and 0.4mm. The above structure proposes an improved technical solution in view of the deficiencies in the prior art. When the structure is set, the impeller 2 is arranged between the first shell 1 and the second shell 3, so as to form a working chamber between the first shell 1 and the second shell 3, and the first gap Ga of the first shell is the smaller one of the fit between the first shell flow channel 13 and the impeller 2, and the range is between 0.15mm and 0.4mm; the position of the first gap Ga of the first shell is between the air inlet 11 and the air outlet 12, and the first gap Ga of the first shell plays a major sealing role to prevent the high-pressure gas from leaking from the air outlet 12 to the air inlet 11; the second fit gap Gb of the first shell is the larger one of the fit between the first shell flow channel and the impeller, and the range of the second fit gap Gb of the first shell is between 1.5mm and 3mm. Driven by the impeller, the gas enters the first shell flow channel 13 from the air inlet 11. On the one hand, it performs circular motion under the rotation of the impeller 2, and the main area of ​​the gas is the gap formed by the outer diameter of the impeller 2 and the second gap Gb of the first shell and the second gap Gd of the second shell. On the other hand, under the action of centrifugal force, the gas enters the impeller 2 from the first shell flow channel 13, accelerates through the impeller 2 to the second shell flow channel 31, enters the impeller 2 after being compressed in the second flow channel 31, and returns to the first flow channel. This movement is repeated many times, and finally flows out from the air outlet 12. The two-stage matching scheme structure with the first matching gap + the second matching gap can greatly increase the outer diameter of the flow channel, increase the flow channel volume, make more airflow move in a circle along the second matching gap, and maintain the high-speed advantage that has been obtained, reduce the gas flow rate loss, increase the outlet flow rate, and reduce the flow resistance at the same time; the flow channel with two-stage matching has obvious processing cost advantages. The first matching gap is the main sealing area, which requires higher precision processing requirements, while the processing accuracy level of the remaining areas can be lowered, which can greatly shorten the overall processing time and reduce processing costs; the flow channel with two-stage matching has obvious structural advantages, avoiding the risk of impeller rubbing due to installation or shaft deviation, and improving the overall stability of the hydrogen pump.The hydrogen circulation pump flow channel structure described in the present invention has a simple structure and can effectively increase the flow rate of the hydrogen pump, reduce flow resistance, and reduce the risk of impeller and flow channel rubbing with a small change in appearance, thereby achieving a high-performance flow channel structure. At the same time, due to the change in the fitting clearance, the fine-machining surface is reduced, thereby reducing the processing cost and time.

[0028] The first fitting clearance Gc of the second shell is in the range of 0.15mm to 0.4mm. The second fitting clearance Gd of the second shell is in the range of 1.5mm to 3mm. In the above structure, the structure of the second shell 3 is symmetrically arranged with the structure of the first shell 1. After the structure is combined, the first shell 1 and the second shell 3 are fixedly connected, and the impeller 2 is installed between the first shell 1 and the second shell 3. The impeller 2 rotates to drive the gas flow.

[0029] The first inner ring 14 of the first shell flow channel 13 is provided with a first through portion 17 connected to the first outer ring 15, and the first through portion 17 is aligned with the first boss 16; the second inner ring 32 of the second shell flow channel 31 is provided with a second through portion 35 connected to the second outer ring 33, and the second through portion 35 is aligned with the second boss 34.

[0030] The first shell 1 or the second shell 3 is provided with an air inlet 11 and an air outlet 12 on its side. The first convex portion 16 of the first shell 1 is located between the air inlet 11 and the air outlet 12. The first gap Ga of the first shell is located between the air inlet 11 and the air outlet 12. The first gap Ga of the first shell cooperates with the first gap Gc of the second shell to play a major sealing role, preventing high-pressure gas from leaking from the air outlet 12 to the air inlet 11, and effectively improving the sealing effect of the structure.

[0031] The gas enters the first shell flow channel 13 from the air inlet 11. Under the rotation of the impeller 2, the gas performs a circular motion. The main area of ​​the gas is the second fitting gap Gb of the first shell formed by the outer diameter of the impeller 2 and the first outer ring 15 of the first shell flow channel 13. At the same time, the gas enters the impeller 2 from the first shell flow channel 13 under the action of centrifugal force, moves to the second shell flow channel 31 after being accelerated by the impeller 2, enters the impeller 2 after being compressed in the second shell flow channel 31, and returns to the first shell flow channel 31. This movement is repeated many times, and finally flows out from the air outlet 12.

[0032] The first shell 1 and the second shell 3 are connected by bolts, and a sealing gasket is arranged between the first shell 1 and the second shell 3. In the above structure, the first shell 1 and the second shell 3 are fixedly connected by bolts, and the sealing gasket is clamped between the first shell 1 and the second shell 3, so as to improve the sealing performance of the working cavity between the first shell 1 and the second shell 3.

[0033] The impeller 2 is connected to the first housing 1 and the second housing 3 via a rotating shaft 21, and the rotating shaft 21 is connected to the driving motor. In the above structure, the driving motor drives the impeller to rotate via the rotating shaft.

[0034] In the flow channel structure of the hydrogen circulation pump described in the present invention, an impeller 2 is arranged between the first shell 1 and the second shell 3, so as to form a working chamber between the first shell 1 and the second shell 3, and the first gap Ga of the first shell is the smaller one of the fit between the first shell flow channel 13 and the impeller 2, and the range is between 0.15mm and 0.4mm; the first gap Ga of the first shell is located between the air inlet 11 and the air outlet 12, and the first gap Ga of the first shell plays a major sealing role to prevent high-pressure gas from leaking from the air outlet 12 to the air inlet 11; the second fitting gap Gb of the first shell is the larger one of the fit between the first shell flow channel and the impeller, and the range of the second fitting gap Gb of the first shell is between 1.5mm and 3mm. Driven by the impeller, the gas enters the first shell flow channel 13 from the air inlet 11. On the one hand, it performs circular motion under the rotation of the impeller 2, and the main area of ​​the gas is the gap formed by the outer diameter of the impeller 2 and the second gap Gb of the first shell and the second gap Gd of the second shell. On the other hand, under the action of centrifugal force, the gas enters the impeller 2 from the first shell flow channel 13, accelerates through the impeller 2 to the second shell flow channel 31, enters the impeller 2 after being compressed in the second flow channel 31, and returns to the first flow channel. This movement is repeated many times, and finally flows out from the air outlet 12. The two-stage matching scheme structure with the first matching clearance + the second matching clearance can greatly increase the outer diameter of the flow channel, increase the flow channel volume, make more airflow move in a circle along the second matching clearance, and maintain the high-speed advantage that has been obtained, reduce the gas flow rate loss, increase the outlet flow rate, and reduce the flow resistance at the same time; the two-stage matching flow channel with the first matching clearance + the second matching clearance has obvious processing cost advantages. The first matching clearance is the main sealing area, which requires higher precision processing requirements, while the processing precision level of the remaining areas can be lowered, which can greatly shorten the overall processing time and reduce processing costs; the two-stage matching flow channel has obvious structural advantages, avoiding the risk of impeller rubbing due to installation or shaft deviation, and improving the overall stability of the hydrogen pump.

[0035] 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 flow channel structure, characterized in that: A first housing flow channel (13) is arranged on the inner wall of the first housing (1), and a second housing flow channel (31) is arranged on the inner wall of the second housing (3). The first housing flow channel (13) is an annular structure. The first housing flow channel (13) comprises a first inner ring (14) and a first outer ring (15). The first outer ring (15) is provided with a first convex portion (16). The second housing flow channel (31) comprises a second inner ring (32) and a second outer ring (33). The second outer ring (33) is provided with a second convex portion (34). A first fitting clearance (Ga) of the first housing is formed between the first convex portion (16) and the outer diameter of the impeller (2). A clearance between the first outer ring (15) and the outer diameter of the impeller (2) is formed between the first outer ring (15) and the outer diameter of the impeller (2). A second fitting clearance (Gb) of the first housing is formed between 0.15 mm and 0.4 mm.

2. The hydrogen circulation pump flow channel structure according to claim 1, characterized in that: The first fitting clearance (Gc) of the second housing is in the range of 0.15 mm to 0.4 mm.

3. The hydrogen circulation pump flow channel structure according to claim 1 or 2, characterized in that: The second fitting gap (Gb) of the first housing is in the range of 1.5 mm to 3 mm.

4. The hydrogen circulation pump flow channel structure according to claim 3, characterized in that: The second fitting gap (Gd) of the second housing is in the range of 1.5 mm to 3 mm.

5. The hydrogen circulation pump flow channel structure according to claim 1 or 2, characterized in that: The first inner ring (14) of the first housing flow channel (13) is provided with a first through portion (17) connected to the first outer ring (15), and the first through portion (17) is aligned with the first boss (16); the second inner ring (32) of the second housing flow channel (31) is provided with a second through portion (35) connected to the second outer ring (33), and the second through portion (35) is aligned with the second boss (34).

6. The hydrogen circulation pump flow channel structure according to claim 1 or 2, characterized in that: An air inlet (11) and an air outlet (12) are arranged on the outside of the first shell (1).

7. The hydrogen circulation pump flow channel structure according to claim 6, characterized in that: The first convex portion (16) of the first shell (1) is located between the air inlet (11) and the air outlet (12).

8. The hydrogen circulation pump flow channel structure according to claim 6, characterized in that: The gas enters the first casing flow channel (13) from the air inlet (11), and under the rotation of the impeller (2), the gas performs a circular motion, and the main area of ​​the gas is the second matching gap (Gb) of the first casing formed by the outer diameter of the impeller (2) and the first outer ring (15) of the first casing flow channel (13); at the same time, the gas enters the impeller (2) from the first casing flow channel (13) under the action of centrifugal force, moves to the second casing flow channel (31) after being accelerated by the impeller (2), enters the impeller (2) after being compressed in the second casing flow channel (31), and returns to the first casing flow channel (31), and repeats this motion multiple times, and finally flows out from the air outlet (12).

9. The hydrogen circulation pump flow channel structure according to claim 1 or 2, characterized in that: The first shell (1) and the second shell (3) are connected by bolts, and a sealing gasket is arranged between the first shell (1) and the second shell (3).

10. The hydrogen circulation pump flow channel structure according to claim 1 or 2, characterized in that: The impeller (2) is connected to the first housing (1) and the second housing (3) via a rotating shaft (21), and the rotating shaft (21) is connected to a driving motor.

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