Small ejector device for fuel cell

Abstract

The utility model discloses a small ejector device for a fuel cell, which comprises a base, a hydrogen joint, a nozzle, a mixing pipe and a three-way pipe, the mixing pipe is of a tubular structure, a plurality of circumferentially arranged hydrogen return air inlets are arranged at the position of the mixing pipe close to a nozzle positioning port, the rear end of the nozzle is inserted into the nozzle positioning port, and the three-way pipe is connected with the nozzle positioning port. The front end of the nozzle is inserted into the hydrogen outlet of the base, the three-way pipe comprises a straight-through pipeline and a bypass pipeline communicated with the straight-through pipeline, the straight-through pipeline of the three-way pipe is sleeved on the mixing pipe, the bypass pipeline of the three-way pipe is communicated with the hydrogen return inlet of the mixing pipe, and the mixing pipe of the structure is of a tubular structure and can be machined by using conventional bars. Compared with the prior art, mold opening is needed, mold cost is saved, the hydrogen return air inlet of the mixing pipe is connected through the three-way pipe, a protruding air inlet in the prior art is replaced, machining cost is saved, the three-way pipe can rotate relative to the axis of the mixing pipe to adjust the angle, different installation angle requirements are met, and flexibility and reliability are achieved.

Description

Technical Field

[0001] The utility model relates to a small ejector device for a fuel cell. Background Art

[0002] The commonly used fuel cell is a power generation device that directly converts the chemical energy of the fuel into electrical energy. The fuel cell system has high energy conversion efficiency and is an ideal way of energy utilization. There is a broad development prospect for commercial application and it has important research significance. In order to provide hydrogen concentration and discharge the mixed gas such as liquid water, nitrogen and a small amount of hydrogen generated by the fuel cell reaction, the supply of hydrogen and oxygen in the fuel cell must be higher than the amount consumed by the electrochemical reaction. In order to improve the utilization rate of hydrogen, hydrogen circulation is the main technical means. There are two main methods of hydrogen circulation, circulation pump and ejector. Among them, the circulation pump has mechanical moving parts and is in a high temperature and high humidity environment, which makes it difficult to guarantee its reliability and the cost is relatively high. In addition, the circulation pump consumes the electricity generated by the fuel cell, which reduces the efficiency of the whole system. The ejector is a device that converts the pressure potential energy of the new hydrogen into a high-speed flow to eject another low-speed and low-energy flow. It has the advantages of low processing difficulty and low energy consumption.

[0003] Existing ejectors such as CN219809191U are an ejector mixing tube and an ejector using the same. The ejector of this structure is used in high-power systems (>80kw) and low-power fuel cell systems (<20kw). Due to the small size of the nozzle and the mixing hole and the small installation space in the system, the existing solution has a high processing cost and insufficient installation flexibility. Summary of the invention

[0004] The purpose of the utility model is to provide a small ejector device for a fuel cell, so as to solve the technical problems in the prior art that the ejectors used in small-power fuel cell systems have small sizes of nozzles and mixing holes in the system installation space, the existing solutions have high processing costs and insufficient installation flexibility.

[0005] The technical solution of the utility model is achieved in this way:

[0006] The utility model provides a small ejector device for a fuel cell, comprising a nozzle, a mixing tube and a tee. The mixing tube is a tubular structure. The front end face of the mixing tube is provided with a nozzle positioning port for high-pressure hydrogen. The rear end face of the mixing tube is provided with a mixing outlet. A plurality of circumferentially arranged hydrogen return inlets are provided at a position of the mixing tube close to the nozzle positioning port. A mixing section flow channel and a diffusion section flow channel are provided in the mixing tube. The rear end of the nozzle is inserted in the nozzle positioning port. The tee comprises a straight-through pipeline and a bypass pipeline connected to the straight-through pipeline. The straight-through pipeline of the tee is sleeved on the mixing tube and wraps the hydrogen return inlet. The bypass pipeline of the tee is connected to the hydrogen return inlet of the mixing tube.

[0007] The nozzle described above is in a tubular structure.

[0008] The rear end outer surface of the nozzle described above is provided with an external thread, and an internal thread that cooperates with the external thread of the nozzle is provided in the mixing tube and between the nozzle positioning port and the hydrogen return inlet.

[0009] The outer surface of the front end of the nozzle described above is in the form of a tapered pipe thread.

[0010] The above-mentioned small ejector device for fuel cells also includes a base and a hydrogen connector. The base is provided with a high-pressure hydrogen inlet, a hydrogen outlet and a connecting pipeline. The hydrogen connector is installed at the high-pressure hydrogen inlet. The hydrogen outlet is provided with an internal thread that cooperates with the tapered pipe thread at the front end of the nozzle.

[0011] The rear end outer surface of the nozzle described above is provided with a sealing groove, in which a sealing ring is installed. When the rear end of the nozzle is inserted into the nozzle positioning port, the mixing tube presses the sealing ring tightly into the sealing groove.

[0012] The straight pipe of the three-way pipe described above is provided with clamps at both ends, and the clamps clamp the nozzle, the mixing pipe and the three-way pipe together.

[0013] A plurality of convex ribs are arranged on the outer surface of the mixing tube.

[0014] The above also includes a pressure sensor, a stop valve and a pressure regulating valve, which are all installed on the base, and the output ends of the pressure sensor, the stop valve and the pressure regulating valve are connected to the high-pressure hydrogen inlet via connecting pipelines.

[0015] Compared with the prior art, the utility model has the following advantages:

[0016] 1. The utility model discloses a small ejector device for a fuel cell, comprising a nozzle, a mixing tube and a tee. The mixing tube is a tubular structure. The front end face of the mixing tube is provided with a nozzle positioning port for high-pressure hydrogen. The rear end face of the mixing tube is provided with a mixing outlet. A plurality of circumferentially arranged hydrogen return inlets are provided at a position of the mixing tube near the nozzle positioning port. A mixing section flow channel and a diffusion section flow channel are provided in the mixing tube. The rear end of the nozzle is inserted in the nozzle positioning port. The tee comprises a straight pipe and a bypass pipe connected with the straight pipe. The straight pipe of the tee is sleeved on the mixing tube and wraps the hydrogen return inlet. The bypass pipe of the tee is connected with the hydrogen return inlet of the mixing tube. The mixing tube of this structure is a tubular structure and can be processed using conventional rods. Compared with the existing technical solution, mold opening is required, which saves mold cost. The hydrogen return inlet of the mixing tube is connected by a tee, which replaces the protruding inlet design of the existing solution, which saves processing cost. The tee can be rotated relative to the axis of the mixing tube to adjust the angle to meet different installation angle requirements, which is flexible and reliable.

[0017] 2. Other advantages of the utility model are described in detail in the embodiment section of the specification. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 A three-dimensional diagram provided for the utility model;

[0019] Figure 2 An exploded view provided for the utility model;

[0020] Figure 3 Another exploded view from another angle provided by the utility model;

[0021] Figure 4 A schematic diagram of the nozzle, mixing tube and tee structure provided by the utility model;

[0022] Figure 5 This is a schematic diagram of the structure of the nozzle, mixing tube and tee provided by the utility model from another angle;

[0023] Figure 6 A front view provided for the utility model;

[0024] Figure 7 for Figure 6 Sectional view of AA in the middle;

[0025] Figure 8 A cross-sectional view provided for the utility model. DETAILED DESCRIPTION

[0026] In order to make the purpose, technical solution and advantages of the embodiment of the utility model clearer, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is a part of the embodiment of the utility model, not all of the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0027] Embodiment 1:

[0028] like Figures 1 to 8As shown, this embodiment provides a small ejector device for a fuel cell, which is characterized by comprising a base 1, a hydrogen joint 2, a nozzle 3, a mixing tube 4 and a tee pipe 5, the base 1 is provided with a high-pressure hydrogen inlet 11, a hydrogen outlet 12 and a connecting pipeline, the hydrogen joint 2 is installed on the high-pressure hydrogen inlet 11, the mixing tube 4 is a tubular structure, the front end surface of the mixing tube 4 is provided with a nozzle positioning port 41 for high-pressure hydrogen, the rear end surface of the mixing tube 4 is provided with a mixing outlet 42, and the mixing tube 4 is provided with a nozzle positioning port 41. A plurality of circumferentially arranged return hydrogen inlets 43 are provided, a mixing section flow channel 44 and a diffusion section flow channel 45 are provided in the mixing tube 4, the rear end of the nozzle 3 is inserted in the nozzle positioning port 41, the front end of the nozzle 3 is inserted in the hydrogen outlet 12 of the base 1, the tee 5 includes a straight pipe 51 and a bypass pipe 52 connected to the straight pipe 51, the straight pipe 51 of the tee 5 is sleeved on the mixing tube 4 and wraps the return hydrogen inlet 43, and the bypass pipe 52 of the tee 5 is connected to the return hydrogen inlet 43 of the mixing tube 4. The mixing tube of this structure is a tubular structure, which can be processed using conventional rods, which saves mold costs compared to the existing solution that requires mold opening, and the return hydrogen inlet of the mixing tube is connected through a tee, which replaces the protruding inlet of the existing solution, saving processing costs, and the tee can be rotated relative to the axis of the mixing tube to adjust the angle, meet different installation angle requirements, and is flexible and reliable.

[0029] The nozzle 3 is a tubular structure and can be processed using conventional bar stock. Compared with the existing solution that requires mold making, the mold cost is saved.

[0030] The rear end outer surface of the nozzle 3 is provided with an external thread, and an internal thread that cooperates with the external thread of the nozzle 3 is provided in the mixing tube 4 and between the nozzle positioning port 41 and the hydrogen return inlet 43. No additional screws or boss connections are required, which simplifies the installation method, facilitates operation and saves space.

[0031] The front end outer surface of the nozzle 3 is a tapered pipe thread 30, and the hydrogen outlet 12 is provided with an internal thread that cooperates with the tapered pipe thread, without the need for additional screws or bosses, thus simplifying the installation method, facilitating operation, and saving space.

[0032] A sealing groove 31 is provided on the outer surface of the rear end of the nozzle 3, and a sealing ring 32 is installed in the sealing groove 31. When the rear end of the nozzle 3 is inserted into the nozzle positioning port 41, the mixing tube 4 presses the sealing ring into the sealing groove, and the sealing effect is good.

[0033] Both ends of the straight pipe 51 of the three-way pipe 5 are provided with clamps 6, and the clamps 6 clamp the nozzle 3, the mixing pipe 4 and the three-way pipe 5 together, so that the fixing effect is good.

[0034] A plurality of convex ribs 46 are arranged on the outer surface of the mixing tube 4. The convex ribs are arranged in the outer circumferential direction to cooperate with the tee pipe and the connecting pipe to strengthen the sealing, so that the sealing effect is good.

[0035] The above also includes a pressure sensor 7, a stop valve 8 and a pressure regulating valve 9, which are all installed on the base 1, and the output ends of the pressure sensor 7, the stop valve 8 and the pressure regulating valve 9 are connected to the high-pressure hydrogen inlet 11 through connecting pipelines.

[0036] The above embodiments are preferred implementation modes of the present invention, but the implementation modes of the present invention are not limited thereto. Any other changes, modifications, substitutions, combinations, and simplifications made without departing from the spirit and principle of the present invention are equivalent replacement methods and are included in the protection scope of the present invention.

Claims

1. A small ejector device for a fuel cell, characterized in that: The invention comprises a nozzle (3), a mixing tube (4) and a tee (5); the mixing tube (4) is in a tubular structure; a nozzle positioning port (41) for high-pressure hydrogen is provided on the front end surface of the mixing tube (4); a mixing outlet (42) is provided on the rear end surface of the mixing tube (4); a plurality of circumferentially arranged hydrogen return inlets (43) are provided at a position of the mixing tube (4) close to the nozzle positioning port (41); a mixing section flow channel (44) and a diffusion section flow channel (45) are provided in the mixing tube (4); the rear end of the nozzle (3) is inserted into the nozzle positioning port (41); the tee (5) comprises a straight pipeline (51) and a bypass pipeline (52) connected to the straight pipeline (51); the straight pipeline (51) of the tee (5) is sleeved on the mixing tube (4) and wraps the hydrogen return inlet (43); the bypass pipeline (52) of the tee (5) is connected to the hydrogen return inlet (43) of the mixing tube (4).

2. A small ejector device for a fuel cell according to claim 1, characterized in that: The nozzle (3) is of tubular structure.

3. A small ejector device for a fuel cell according to claim 2, characterized in that: An external thread is provided on the outer surface of the rear end of the nozzle (3), and an internal thread that cooperates with the external thread of the nozzle (3) is provided in the mixing tube (4) and between the nozzle positioning port (41) and the hydrogen return inlet port (43).

4. A small ejector device for a fuel cell according to claim 3, characterized in that: The outer surface of the front end of the nozzle (3) is in the form of a tapered pipe thread (30).

5. A small ejector device for a fuel cell according to claim 4, characterized in that: A sealing groove (31) is provided on the outer surface of the rear end of the nozzle (3), and a sealing ring (32) is installed in the sealing groove (31). When the rear end of the nozzle (3) is inserted into the nozzle positioning opening (41), the mixing tube (4) presses the sealing ring (32) tightly into the sealing groove (31).

6. A small ejector device for a fuel cell according to claim 5, characterized in that: The invention also comprises a base (1) and a hydrogen connector (2). The base (1) is provided with a high-pressure hydrogen inlet (11), a hydrogen outlet (12) and a connecting pipeline. The hydrogen connector (2) is installed at the high-pressure hydrogen inlet (11). The hydrogen outlet (12) is provided with an internal thread which cooperates with a tapered pipe thread (30) at the front end of the nozzle (3).

7. A small ejector device for a fuel cell according to claim 1 or 2 or 3 or 4 or 5 or 6, characterized in that: Clamps (6) are provided at both ends of the straight pipe (51) of the tee pipe (5), and the clamps (6) clamp the nozzle (3), the mixing pipe (4) and the tee pipe (5) together.

8. A small ejector device for a fuel cell according to claim 7, characterized in that: A plurality of convex ribs (46) are provided on the outer surface of the mixing tube (4).

9. A small ejector device for a fuel cell according to claim 6, characterized in that: It also includes a pressure sensor (7), a stop valve (8) and a pressure regulating valve (9), wherein the pressure sensor (7), the stop valve (8) and the pressure regulating valve (9) are all mounted on the base (1), and the output ends of the pressure sensor (7), the stop valve (8) and the pressure regulating valve (9) are respectively connected to the high-pressure hydrogen inlet via connecting pipelines.

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