A vortex hydrogen pump for a fuel cell system

Abstract

The application relates to a vortex hydrogen pump for a fuel cell system, which comprises a pump body, a front end cover and an impeller; the impeller comprises an axle and a wheel body, one side of the wheel body is provided with inner ring blades and outer ring blades from inside to outside, and an annular groove is arranged between the inner ring blades and the outer ring blades; the outer side of the front end cover is provided with an air inlet and an air outlet, the inner side of the front end cover is provided with an inner side flow channel and an outer side flow channel from inside to outside, the air inlet is communicated with the inner side flow channel, and the air outlet is communicated with the outer side flow channel; an inter-stage partition plate is arranged between the inner side flow channel and the outer side flow channel, the inter-stage partition plate is an annular protrusion, the inter-stage partition plate is matched with the annular groove, the inner side flow channel and the outer side flow channel correspond to the inner ring blades and the outer ring blades respectively, and the inner side flow channel and the outer side flow channel are communicated through an inter-stage channel; only one impeller is adopted, the function of a double-stage vortex air pump is realized, and the application has the advantages of few parts, simple structure and high efficiency.

Description

Technical Field

[0001] This invention relates to a vortex hydrogen pump for a fuel cell system. Background Technology

[0002] A vortex blower is a type of blower used to generate high-pressure airflow. To obtain higher pressure, in addition to increasing the impeller diameter, there is also a method of connecting two unit stages in series. There are two methods in existing technologies: the first is to connect two unit stages of the vortex blower in series, that is, to connect the outlet of the first unit stage to the inlet of the second unit stage via a channel, for example, patent application CN202789558U entitled "A Two-Stage High-Pressure Vortex Blower"; the other is to arrange two stages of the vortex blower on both sides of a single impeller, with the two stages connected by a bottom channel, for example, patent application CN107795497A entitled "Single Impeller Two-Stage Vortex Blower".

[0003] The first scheme mentioned above uses two impellers as two stages, which results in more parts, complex structure, inconvenient processing, and higher cost. While the second scheme mentioned above effectively reduces the number of parts and simplifies the machine structure, there is a sudden change in the direction of rotation of the gas from the first stage to the second stage, which inevitably leads to a large local flow loss and reduces the efficiency of the vortex pump. Summary of the Invention

[0004] To address the aforementioned technical problems, this invention proposes a vortex hydrogen pump for fuel cell systems, which uses only one impeller to achieve the function of a two-stage vortex gas pump, and has the advantages of fewer parts, simple structure, and high efficiency.

[0005] The technical solution of this invention to solve the above problems is: a vortex hydrogen pump for a fuel cell system, which is special in that:

[0006] It includes a pump body, a front cover, and an impeller; the front cover is mounted on the pump body, and the impeller is located inside the pump body and the front cover.

[0007] The impeller includes a shaft and a wheel body. The shaft is connected to one side of the wheel body, and the other side of the wheel body is provided with inner and outer ring blades from the inside to the outside. An annular groove is provided between the inner and outer ring blades.

[0008] The pump body has a cavity, the impeller shaft passes through the pump body, and the impeller body is located inside the cavity;

[0009] The outer side of the front cover is provided with an air inlet and an exhaust outlet. The inner side of the front cover is provided with an inner flow channel and an outer flow channel from the inside to the outside. The air inlet is connected to the inner flow channel, and the exhaust outlet is connected to the outer flow channel.

[0010] A stage partition plate is provided between the inner and outer flow channels. The stage partition plate is an annular protrusion that mates with an annular groove. The inner and outer flow channels correspond to the inner and outer ring blades, respectively, and are connected by an interstage channel. An inner tongue is provided on the inner flow channel, which is located between the interstage channel and the air inlet. An outer tongue is provided on the outer flow channel, which is located between the interstage channel and the exhaust port.

[0011] Furthermore, the width of the outer flow channel is smaller than the width of the inner flow channel.

[0012] Furthermore, the height of the outer blades is less than the height of the inner blades.

[0013] Furthermore, the size of the air intake is larger than the size of the exhaust port.

[0014] Furthermore, the aforementioned interstage channel is a passageway that passes through the interstage partition plate.

[0015] Furthermore, the aforementioned air intake is located close to the inner side of the tongue.

[0016] Furthermore, the aforementioned exhaust port is located close to one side of the outer tongue.

[0017] Furthermore, the aforementioned front cover is connected to the pump body by bolts.

[0018] Advantages of this invention:

[0019] The vortex hydrogen pump for fuel cell systems provided by this invention uses only one impeller, and designs one side of the impeller with two rings of blades, inner and outer. Combined with the design of inner and outer flow channels, inner and outer tongues, and interstage channels on the end cover, it realizes the function of a two-stage vortex pump. Compared with the two existing two-stage vortex pump solutions, the technical solution of this invention effectively reduces the number of parts, simplifies assembly, improves reliability, reduces flow losses, and improves efficiency. Attached Figure Description

[0020] Figure 1 This is an axial cross-sectional schematic diagram of a single-sided two-stage vortex air pump, mainly showing the main components and assembly relationships of the single-sided two-stage vortex air pump.

[0021] Figure 2 This is a view facing the front cover of the vortex air pump, mainly showing the positions of the air inlet and exhaust outlet;

[0022] Figure 3 It shows the internal structure of the front end cover after the impeller is disassembled, mainly showing the positions of the inner tongue, outer tongue, and interstage channel.

[0023] Figure 4 This is a view of the impeller after it has been disassembled, mainly showing the structure of the impeller.

[0024] The diagram shows: 1. Inner flow channel, 2. Inner septum, 3. Outer flow channel, 4. Outer septum, 5. Impeller, 6. Inlet, 7. Exhaust, 8. Inner ring blade, 9. Outer ring blade, 10. Interstage channel, 11. Interstage partition. Detailed Implementation

[0025] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention. Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention.

[0026] See Figures 1-4 A vortex hydrogen pump for a fuel cell system includes a pump body, a front end cover, and an impeller; the front end cover is bolted to the pump body, and the impeller is located inside the pump body and the front end cover.

[0027] See Figure 4 The impeller includes a shaft and a wheel body. The shaft is connected to one side of the wheel body, and the other side of the wheel body is provided with an inner ring blade 8 and an outer ring blade 9 from the inside to the outside. An annular groove is provided between the inner ring blade 8 and the outer ring blade 9.

[0028] See Figure 1 , Figure 2 and Figure 3 The pump body has a cavity, the impeller shaft passes through the pump body, and the impeller body is located in the cavity. The outer side of the front cover has an air inlet 6 and an exhaust port 7. The inner side of the front cover has an inner flow channel 1 and an outer flow channel 3 from the inside to the outside. The air inlet 6 is connected to the inner flow channel 1, and the exhaust port 7 is connected to the outer flow channel 3.

[0029] See Figure 1 , Figure 2 and Figure 3 A stage partition plate 11 is provided between the inner flow channel 1 and the outer flow channel 3. The stage partition plate 11 is an annular protrusion that mates with an annular groove. The inner flow channel 1 and the outer flow channel 3 correspond to the inner ring blade 8 and the outer ring blade 9, respectively. The inner flow channel 1 and the outer flow channel 3 are connected by an interstage channel 10. An inner tongue 2 is provided on the inner flow channel 1, which is located between the interstage channel 10 and the air inlet 6. An outer tongue 4 is provided on the outer flow channel 3, which is located between the interstage channel 10 and the exhaust port 7.

[0030] The fuel cell system uses a vortex hydrogen pump to arrange two stages of the vortex pump on the inner and outer sides of a single impeller. The inner ring blades 8 of the impeller and the inner flow channel 1 form the first stage of the vortex pump, and the outer ring blades 9 of the impeller and the outer flow channel 3 form the second stage of the vortex pump. The first stage and the second stage are connected by an interstage channel 10.

[0031] Within each stage of the vortex pump, the gas pressure gradually increases along the direction of rotation of its circumference, therefore... Figure 3 As shown, the present invention employs an inner tongue 2 and an outer tongue 4 in the first and second stages respectively to achieve radial isolation between high and low pressure zones within a unit stage. Specifically, the isolation between different pressure zones within the first unit stage is achieved by the inner tongue 2, while the isolation between different pressure zones within the second unit stage is achieved by the outer tongue 4. Simultaneously, the inner tongue 2 guides gas from the inlet 6 into the first unit stage and guides gas through the interstage channel 10 from the first unit stage into the second unit stage, while the outer tongue 4 guides gas from the second unit stage into the exhaust port 7.

[0032] There is a pressure difference between the two unit stages of the vortex hydrogen pump used in the fuel cell system, such as Figure 1 As shown, the present invention has a stage spacer 11 inside the front cover. The gap between the stage spacer 11 and the impeller 5 is extremely small. Therefore, the resistance to gas leakage from the second unit stage to the first unit stage through the gap is very large, forming a certain degree of sealing, thereby maintaining the pressure between each unit stage of the vortex pump.

[0033] When the vortex hydrogen pump of the fuel cell system is in use, the prime mover drives the impeller shaft to rotate, and the impeller 5 presses... Figure 4 Rotate in the direction indicated by the middle arrow. Gas enters the vortex pump through the inlet 6, and is first pressurized in the first stage of the vortex pump formed by the inner ring blades 8 and the inner flow channel 1. Then, guided by the inner tongue 2, due to the centrifugal force, it enters the second stage of the vortex pump formed by the outer ring blades 9 and the outer flow channel 3 through the interstage channel 10 for a second pressurization. Finally, guided by the outer tongue 4, it is discharged from the vortex pump through the exhaust port 7.

[0034] In a preferred embodiment of the present invention, the interstage channel 10 is a duct that passes through the interstage partition. One end of the interstage channel 10 is connected to the first stage of the vortex pump, and the other end is connected to the second stage.

[0035] In a preferred embodiment of the present invention, because the gas pressure increases and the volumetric flow rate decreases within the vortex pump, the width of the outer flow channel 3 and the blade height of the outer blade 9 are both smaller than the width of the inner flow channel 1 and the blade height of the inner blade 8, thereby making the volumetric flow rate of the first stage smaller than that of the second stage. Furthermore, the cross-sectional areas of the inlet 6, the interstage channel 10, and the exhaust port 7 also decrease sequentially to accommodate changes in volumetric flow rate.

[0036] In a preferred embodiment of the present invention, the air inlet 6 is close to one side of the inner tongue 2 and the exhaust port 7 is close to one side of the outer tongue 4, making full use of the stroke of the inner flow channel 1 and the outer flow channel 3 to achieve effective pressurization.

[0037] In summary, this invention proposes a vortex hydrogen pump for a fuel cell system, which uses a single impeller to achieve the function of a two-stage vortex pump. Two unit stages of the vortex pump are arranged on one side of a single impeller, inside and outside respectively. The inner ring blades 8 of the impeller 5 and the inner flow channel 1 form the first stage of the vortex pump, and the outer ring blades 9 of the impeller 5 and the outer flow channel 3 form the second stage of the vortex pump. The first and second stages are connected by an interstage channel 10; the stage partition plate 11 isolates the high and low pressure areas. Compared with existing dual-impeller two-stage vortex pumps, the single-sided vortex pump of this invention reduces the number of mating parts, thereby simplifying assembly and increasing reliability. Furthermore, the single-sided vortex pump of this invention has lower flow losses and improved efficiency compared with existing single-impeller two-stage vortex pumps.

[0038] The above description is merely an embodiment of the present invention and is not intended to limit the scope of protection of the present invention. Any equivalent structural or procedural transformations made based on the content of the present invention specification and drawings, or direct or indirect applications in other related system fields, are similarly included within the scope of protection of the present invention.

Claims

1. A vortex hydrogen pump for fuel cell system, characterized in that: it comprises a pump body, a front end cover and an impeller; the front end cover is installed on the pump body, and the impeller is located in the pump body and the front end cover; the impeller comprises a shaft and a wheel body, one side of the shaft is connected with the wheel body, the other side of the wheel body is provided with inner ring blades (8) and outer ring blades (9) from inside to outside, and an annular groove is arranged between the inner ring blades (8) and the outer ring blades (9); a cavity is arranged in the pump body, the shaft of the impeller penetrates through the pump body, and the wheel body is located in the cavity; an air inlet (6) and an air outlet (7) are arranged on the outside of the front end cover, and an inner side flow channel (1) and an outer side flow channel (3) are arranged on the inside of the front end cover from inside to outside; the air inlet (6) is communicated with the inner side flow channel (1), and the air outlet (7) is communicated with the outer side flow channel (3); an inter-stage partition plate is arranged between the inner side flow channel (1) and the outer side flow channel (3), the inter-stage partition plate is an annular protrusion, the inter-stage partition plate is matched with the annular groove, the inner side flow channel (1) and the outer side flow channel (3) correspond to the inner ring blades (8) and the outer ring blades (9) respectively, and the inner side flow channel (1) and the outer side flow channel (3) are communicated through an inter-stage channel (10); an inner side partition tongue (2) is arranged on the inner side flow channel (1), and the inner side partition tongue (2) is located between the inter-stage channel (10) and the air inlet (6); an outer side partition tongue (4) is arranged on the outer side flow channel (3), and the outer side partition tongue (4) is located between the inter-stage channel (10) and the air outlet (7).

2. The vortex hydrogen pump for fuel cell system according to claim 1, characterized in that: the width of the outer side flow channel (3) is smaller than the width of the inner side flow channel (1).

3. The vortex hydrogen pump for fuel cell system according to claim 2, characterized in that: the height of the outer ring blades (9) is smaller than the height of the inner ring blades (8).

4. The vortex hydrogen pump for fuel cell system according to any one of claims 1-3, characterized in that: the size of the air inlet (6) is larger than the size of the air outlet (7).

5. The vortex hydrogen pump for fuel cell system according to claim 4, characterized in that: the inter-stage channel (10) is a hole, and the hole penetrates through the inter-stage partition plate.

6. The vortex hydrogen pump for fuel cell system according to any one of claims 1-3, characterized in that: the air inlet (6) is close to one side of the inner side partition tongue (2).

7. The vortex hydrogen pump for fuel cell system according to any one of claims 1-3, characterized in that: the air outlet (7) is close to one side of the outer side partition tongue (4).

8. The vortex hydrogen pump for fuel cell system according to any one of claims 1-3, characterized in that: the front end cover is connected with the pump body through bolts. ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

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