Roots type hydrogen circulating pump integrated with one-way valve
By integrating a check valve in the Roots hydrogen circulation pump, ensuring that the intake joint and the outlet joint are connected when the pump is shut down, the problem that the Roots hydrogen circulation pump cannot be used in series with the induction device is solved, and its applicability and convenience of system control are improved.
Patent Information
- Application Number
- CN202422078475.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-26
- Publication Date
- 2025-07-01
- Estimated Expiration
- 2034-08-26
AI Technical Summary
The Roots-type hydrogen circulation pump cannot keep the intake joint and the outlet joint in the shutdown state, resulting in the inability to be used in series with the injector, limiting its applicability on different power stacks and increasing the difficulty of system control.
A Roots-type hydrogen circulation pump with integrated check valve is designed. By setting an intake joint and an outlet joint on the integrated compression chamber cover of the check valve, and a low-pressure chamber and a high-pressure zone for the intake air are provided in the integrated compression chamber cover of the check valve. One-way communication channel and the check valve diaphragm are used to achieve one-way communication between the intake air and the exhaust air, ensuring that the intake joint and the outlet joint are still in communication when the pump is shut down.
The Roots-type hydrogen circulation pump is realized to keep the intake joint and the outlet joint in a shutdown state, which is convenient for use in series with the injector, improves the applicability of the pump to different power stacks and reduces the difficulty of system control.
Smart Images
Figure CN223049006U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of hydrogen fuel cells, and specifically discloses a Roots-type hydrogen circulation pump integrated with a one-way valve. Background Art
[0002] As a key component of a fuel cell system, the role of a hydrogen circulation pump is to transport the hydrogen required for the reaction of the fuel cell system and to re-inject the hydrogen that has not been fully reacted after passing through the fuel cell, thereby improving the hydrogen utilization efficiency. A Roots-type hydrogen circulation pump is a rotary positive displacement compressor, which mainly pressurizes and transports gas through a pair of gas compression rotors rotating in opposite directions in a sealed cavity. It has the advantages of high pumping speed, fast startup, and simple structure, and is widely used in fields such as chemical industry, electronics, metallurgy, pharmaceuticals, and food processing.
[0003] Since the development of hydrogen fuel cells to date, the series ejector and hydrogen circulation pump scheme has been widely recognized and applied due to its high efficiency and strong applicability. It makes up for the shortcomings of the single ejector with low pressure lift and small pumping efficiency, and the hydrogen circulation pump does not need to work under low operating conditions, improving the overall service life. However, when the Roots-type hydrogen circulation pump is not working, the air inlet and outlet are not connected and cannot be connected in series with the ejector. Summary of the Invention
[0004] The purpose of the utility model is to overcome the deficiencies existing in the prior art and provide a Roots-type hydrogen circulation pump integrated with a one-way valve that can keep the air inlet joint and the air outlet joint connected when the Roots-type hydrogen circulation pump is in a shutdown state.
[0005] According to the technical solution provided by the utility model, the Roots-type hydrogen circulation pump integrated with a one-way valve includes a one-way valve integrated compression chamber cover and a compression chamber shell fixed together;
[0006] An air inlet joint and an air outlet joint are fixed on the one-way valve integrated compression chamber cover. An air inlet low-pressure chamber is arranged in the one-way valve integrated compression chamber cover at the position corresponding to the air inlet joint, and an air outlet high-pressure area is arranged in the one-way valve integrated compression chamber cover at the position corresponding to the air outlet joint. A one-way communication channel is arranged in the one-way valve integrated compression chamber cover. A one-way valve seat is arranged on the one-way valve integrated compression chamber cover at the position corresponding to the outlet end of the one-way communication channel. A one-way valve diaphragm is installed on the one-way valve seat. One end of the one-way valve diaphragm is fixed to the one-way valve seat, and the other end of the one-way valve diaphragm is a free end. The air inlet low-pressure chamber and the air outlet high-pressure area are in one-way communication through the one-way communication channel and the one-way valve diaphragm;
[0007] A compression cavity is provided inside the compression cavity housing. A drive shaft hole and a main shaft hole are provided on the compression cavity housing. A drive shaft is rotatably installed in the drive shaft hole. A sealed connection is formed between the outer circle of the drive shaft and the inner wall of the drive shaft hole. One end of the drive shaft extends into the compression cavity. A drive air compression rotor is fixed on the drive shaft extending into the compression cavity. A drive gear is fixed at the other end of the drive shaft. A main shaft is rotatably installed in the main shaft hole. A sealed connection is formed between the outer circle of the main shaft and the inner wall of the main shaft hole. One end of the main shaft extends into the compression cavity. A main air compression rotor is fixed on the main shaft extending into the compression cavity. A main gear is fixed at the other end of the main shaft.
[0008] The main gear meshes with the drive gear. The drive air compression rotor cooperates with the main air compression rotor. The compression cavity on one side of the drive air compression rotor communicates with the intake low-pressure cavity. The compression cavity on one side of the main air compression rotor communicates with the outlet high-pressure area.
[0009] Preferably, it further includes a drive bearing and a drive hydrogen sealing ring. The drive shaft is rotatably installed in the drive shaft hole through the drive bearing. A drive hydrogen sealing ring is provided between the outer circle of the drive shaft and the inner wall of the drive shaft hole.
[0010] Preferably, it further includes a main bearing and a main hydrogen sealing ring. The main shaft is rotatably installed in the main shaft hole through the main bearing. A main hydrogen sealing ring is provided between the outer circle of the main shaft and the inner wall of the main shaft hole.
[0011] Preferably, the angle formed between the one-way valve seat and the one-way communication channel is 75 - 85°.
[0012] The present utility model integrates the one-way valve with the intake and outlet interfaces of the Roots hydrogen circulation pump, enabling the Roots hydrogen circulation pump to keep the intake joint and the outlet joint connected in the shutdown state. It can be used in series with an ejector, improving the applicability of the Roots hydrogen circulation pump to fuel cells with different powers and reducing the system control difficulty. BRIEF DESCRIPTION OF THE DRAWINGS
[0013] Figure 1 is a schematic structural diagram of the present utility model.
[0014] Figure 2 is a side sectional view of the present utility model.
[0015] Figure 3 is a top sectional view of the present utility model.
[0016] Figure 4 is a schematic structural diagram of the one-way valve in the present utility model. DETAILED DESCRIPTION OF THE EMBODIMENTS
[0017] To make the objectives, technical solutions, and advantages of the embodiments of the present utility model clearer, the following will clearly and completely describe the technical solutions of the present utility model in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are some, but not all, of the embodiments of the present utility model. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts fall within the scope of protection of the present utility model.
[0018] A Roots-type hydrogen circulation pump integrated with a check valve, as Figures 1-4 shown, which includes a check-valve integrated compression chamber cover 1 and a compression chamber housing 2 fixed together;
[0019] An air inlet joint 11 and an air outlet joint 12 are fixed on the check-valve integrated compression chamber cover 1. An air inlet low-pressure chamber 15 is provided inside the check-valve integrated compression chamber cover 1 at a position corresponding to the air inlet joint 11. An air outlet high-pressure area 16 is provided inside the check-valve integrated compression chamber cover 1 at a position corresponding to the air outlet joint 12. A check valve seat 14 is provided on the check-valve integrated compression chamber cover 1 at a position corresponding to the outlet end of the one-way communication channel 17. A check valve diaphragm 13 is installed on the check valve seat 14. One end of the check valve diaphragm 13 is fixed to the check valve seat 14, and the other end of the check valve diaphragm 13 is a free end. The check valve diaphragm 13 is a rubber diaphragm with a certain elastic modulus. The air inlet low-pressure chamber 15 and the air outlet high-pressure area 16 are in one-way communication through the one-way communication channel 17 and the check valve diaphragm 13;
[0020] A compression cavity 29 is formed inside the compression chamber housing 2. A drive shaft hole and a main drive shaft hole are formed on the compression chamber housing 2. A drive shaft 27 is rotatably installed in the drive shaft hole. A sealed connection is formed between the outer circumference of the drive shaft 27 and the inner wall of the drive shaft hole. One end of the drive shaft 27 extends into the compression cavity 29. A drive air compression rotor 25 is fixed on the drive shaft 27 extending into the compression cavity 29. A drive gear is fixed to the other end of the drive shaft 27. A main drive shaft 28 is rotatably installed in the main drive shaft hole. A sealed connection is formed between the outer circumference of the main drive shaft 28 and the inner wall of the main drive shaft hole. One end of the main drive shaft 28 extends into the compression cavity 29. A main air compression rotor 26 is fixed on the main drive shaft 28 extending into the compression cavity 29. A main gear is fixed to the other end of the main drive shaft 28;
[0021] The main gear meshes with the drive gear. The drive air compression rotor 25 cooperates with the main air compression rotor 26. The compression cavity 29 on one side of the drive air compression rotor 25 communicates with the air inlet low-pressure chamber 15, and the compression cavity 29 on one side of the main air compression rotor 26 communicates with the air outlet high-pressure area 16.
[0022] It also includes a transmission bearing 21 and a transmission hydrogen sealing ring 23. A transmission shaft 27 is rotatably installed in the transmission shaft hole through the transmission bearing 21. A transmission hydrogen sealing ring 23 is provided between the outer circle of the transmission shaft 27 and the inner wall of the transmission shaft hole. The transmission bearing 21 is a deep groove ball bearing.
[0023] It also includes a driving bearing 22 and a driving hydrogen sealing ring 24. A driving shaft 28 is rotatably installed in the driving shaft hole through the driving bearing 22. A driving hydrogen sealing ring 24 is provided between the outer circle of the driving shaft 28 and the inner wall of the driving shaft hole. The driving bearing 22 is a deep groove ball bearing.
[0024] The included angle between the one-way valve seat 14 and the one-way communication channel 17 is 75° to 85°.
[0025] When the pump is running, since the driving gear meshes with the transmission gear, the transmission shaft 27 and the transmission air compression rotor 25 fixed on the transmission shaft 27 rotate in the opposite direction to the driving shaft 28 and the driving air compression rotor 26 fixed on the driving shaft 28. Hydrogen is drawn in from the intake joint 11. After being pressurized by the transmission air compression rotor 25 and the driving air compression rotor 26 installed in the compression cavity 29, the hydrogen is discharged from the outlet joint 12. During the operation of the pump, a certain air pressure difference is formed between the intake low-pressure chamber 15 and the outlet high-pressure chamber 16, so that the one-way valve diaphragm 13 is tightly attached to the one-way valve seat 14 due to the pressure, preventing the intake low-pressure chamber 15 from communicating with the outlet high-pressure chamber 16 and causing air leakage, thus realizing the pressurization of hydrogen.
[0026] Since the included angle between the one-way valve seat 14 and the one-way communication channel 17 is 75° to 85°, when the pump stops, the one-way valve diaphragm 13 and the one-way valve seat 14 are not tightly attached. After the pump stops, the air pressures in the intake low-pressure chamber 15 and the outlet high-pressure chamber 16 are the same, and the one-way valve diaphragm 13 separates from the one-way valve seat 14. The intake low-pressure chamber 15 and the outlet high-pressure chamber 16 are connected through the one-way communication channel 17, enabling the hydrogen of the ejector to smoothly pass through the hydrogen circulation pump and reach the fuel cell end.
[0027] Finally, it should be noted that the above specific embodiments are only used to illustrate the technical solutions of the present invention rather than to limit them. Although the present invention has been described in detail with reference to the examples, those of ordinary skill in the art should understand that the technical solutions of the present invention can be modified or equivalently replaced without departing from the spirit and scope of the technical solutions of the present invention, and they should all be covered within the scope of the claims of the present invention.
Claims
1. A Roots-type hydrogen circulation pump with an integrated one-way valve, characterized in that: It comprises a one-way valve integrated compression chamber cover (1) and a compression chamber shell (2) fixed together; An air inlet joint (11) and an air outlet joint (12) are fixed to the one-way valve integrated compression chamber cover (1); an air inlet low-pressure chamber (15) is provided in the one-way valve integrated compression chamber cover (1) at a position corresponding to the air inlet joint (11); an air outlet high-pressure area (16) is provided in the one-way valve integrated compression chamber cover (1) at a position corresponding to the air outlet joint (12); a one-way communication channel (17) is provided in the one-way valve integrated compression chamber cover (1); and a one-way communication channel (18) is provided in the one-way valve integrated compression chamber cover (1). A one-way valve seat (14) is provided on the one-way valve integrated compression chamber cover (1) at the outlet end of the communication channel (17), and a one-way valve diaphragm (13) is installed on the one-way valve seat (14). One end of the one-way valve diaphragm (13) is fixed to the one-way valve seat (14), and the other end of the one-way valve diaphragm (13) is a free end. The air inlet low-pressure chamber (15) and the air outlet high-pressure area (16) are one-way connected through the one-way communication channel (17) and the one-way valve diaphragm (13); A compression chamber (29) is provided in the compression chamber shell (2), a transmission shaft hole and a driving shaft hole are provided on the compression chamber shell (2), a transmission shaft (27) is rotatably mounted in the transmission shaft hole, an outer circle of the transmission shaft (27) and an inner wall of the transmission shaft hole are in sealed connection, one end of the transmission shaft (27) extends into the compression chamber (29), a transmission compressor rotor (25) is fixed on the transmission shaft (27) extending into the compression chamber (29), and a transmission gear is fixed on the other end of the transmission shaft (27); a driving shaft (28) is rotatably mounted in the driving shaft hole, an outer circle of the driving shaft (28) and an inner wall of the driving shaft hole are in sealed connection, one end of the driving shaft (28) extends into the compression chamber (29), an active compressor rotor (26) is fixed on the active shaft (28) extending into the compression chamber (29), and a driving gear is fixed on the other end of the driving shaft (28); The driving gear meshes with the transmission gear, the transmission compressor rotor (25) cooperates with the active compressor rotor (26), the compression chamber (29) on one side of the transmission compressor rotor (25) is connected to the intake low-pressure chamber (15), and the compression chamber (29) on one side of the active compressor rotor (26) is connected to the outlet high-pressure area (16).
2. The Roots-type hydrogen circulation pump with integrated one-way valve as claimed in claim 1, characterized in that: It also includes a transmission bearing (21) and a transmission hydrogen sealing ring (23), wherein a transmission shaft (27) is rotatably mounted in the transmission shaft hole via the transmission bearing (21), and a transmission hydrogen sealing ring (23) is provided between the outer circle of the transmission shaft (27) and the inner wall of the transmission shaft hole.
3. The Roots-type hydrogen circulation pump with integrated one-way valve as claimed in claim 1, characterized in that: It also includes an active bearing (22) and an active hydrogen sealing ring (24), wherein an active shaft (28) is rotatably mounted in the active shaft hole via the active bearing (22), and an active hydrogen sealing ring (24) is provided between the outer circle of the active shaft (28) and the inner wall of the active shaft hole.
4. The Roots-type hydrogen circulation pump with integrated one-way valve as claimed in claim 1, characterized in that: The included angle between the one-way valve seat (14) and the one-way communication channel (17) is 75-85°.