Ejector and fuel cell system

Abstract

The utility model relates to the technical field of fuel cells, and particularly provides an ejector and a fuel cell system. The ejector disclosed by the utility model is applied to a fuel cell system and comprises a shell for gas to flow through, the shell is coated or mixed with a water-absorbing color developing material, and the water-absorbing color developing material can enable the shell to present different colors along with the humidity change of the gas flowing through the shell. The gas comprises gas entering an electric pile of the fuel cell system from an anode inlet of the fuel cell system. According to the ejector disclosed by the utility model, the water-absorbing color-developing material is mixed into or coated on the shell, so that the color of the water-absorbing color-developing material can be changed according to the humidity of the gas flowing through the shell, and the aim of monitoring the humidity of the gas flowing through the ejector in real time is fulfilled.

Description

TECHNICAL FIELD

[0001] The utility model relates to fuel cell technical field, especially a kind of ejector, in addition, the utility model also relates to a kind of fuel cell system. BACKGROUND

[0002] Fuel cell is gradually developed and is put into the practical application of new energy vehicle as a new energy form of energy saving and environmental protection.In fuel cell system, electric pile accepts the supply of hydrogen and air to carry out combustion reaction, generates heat and is ultimately converted into electric energy.

[0003] Hydrogen supply unit supplies hydrogen to electric pile, and air supply unit supplies air to electric pile;Tail gas discharged after electric pile reaction can contain a small amount of hydrogen, water vapor and the like;Tail gas is separated and treated by water-gas separator, and separated hydrogen is re-entered into electric pile for combustion with hydrogen supplied by hydrogen supply unit, to save the consumption of fuel.

[0004] In existing fuel cell system, ejector is arranged to accept the inflow of hydrogen separated by water-gas separator and hydrogen supplied by hydrogen supply unit, and the hydrogen from water-gas separator and hydrogen supply unit is mixed in ejector and then enters into electric pile through gas inlet of electric pile.

[0005] In actual application, hydrogen separated by water-gas separator still contains a certain amount of water vapor, which can cause the humidity of mixed hydrogen in ejector to be relatively large, and when the hydrogen supplied by shell exceeds the standard, too much condensate enters into electric pile, which can cause electric pile to be flooded and cause serious damage to electric pile.

[0006] If humidity sensor is arranged at gas inlet of electric pile or communication pipeline of gas inlet, it not only increases cost, but also causes certain difficulty in space arrangement of fuel cell system, and existing ejector does not have the function of humidity monitoring. CONTENT OF UTILITY MODEL

[0007] Therefore, the utility model aims at providing an ejector to monitor the humidity of gas flowing through the ejector in real time.

[0008] To achieve the above-mentioned purpose, the technical scheme of the utility model is as follows:

[0009] An ejector is applied to fuel cell system, which comprises shell through which gas flows, the shell is coated with or mixed with water-absorbing color-developing material, and the water-absorbing color-developing material can change the color of the shell with the change of humidity of gas flowing through the shell, and the gas includes gas entering into electric pile of fuel cell system from anode inlet of the fuel cell system.

[0010] Further, the shell is integrally injection molded, and the water-absorbing color-developing material is mixed in the injection molding base material of the shell.

[0011] Further, at least part of the shell is made of transparent material, and the water-absorbing color-developing material is coated on the inner wall of the transparent part of the shell.

[0012] Further, the shell comprises a gas inlet section, a mixing pipe and a gas outlet section connected in sequence, the end of the gas inlet section is provided with a suction port for inserting the nozzle, and the end of the gas outlet section is provided with a gas outlet port.

[0013] Further, the side wall of the mixing pipe is provided with a window, the window is blocked by a transparent plate, and the inner wall of the transparent plate is coated with the water-absorbing color-developing material.

[0014] Further, the inner diameter of the gas inlet section gradually decreases from the end of the gas inlet section to the mixing pipe, and the inner diameter of the mixing pipe gradually increases from the gas inlet section to the gas outlet section.

[0015] Further, the outer periphery of the gas inlet section and the gas outlet section is provided with a groove for sleeving a sealing ring, and / or the outer wall of the mixing pipe is provided with a reinforcing rib.

[0016] Further, a limiting boss is formed on the outer wall of the connection between the gas inlet section and the mixing pipe, the limiting boss is used for limiting the insertion depth of a pipeline inserted into the gas inlet section, and / or a mounting boss is formed on the outer wall of the connection between the gas outlet section and the mixing pipe, and the mounting hole for mounting the ejector is arranged on the mounting boss.

[0017] Further, a humidity sensor is arranged in the mixing pipe.

[0018] Compared with the prior art, the utility model has the following advantages:

[0019] The ejector of the utility model utilizes the nozzle to supply high-pressure and high-speed gas into the shell, can introduce low-pressure gas connected with the inlet of the shell into the shell, and supply the mixed gas from the gas outlet port. By mixing the water-absorbing color-developing material in the shell or coating a layer of water-absorbing color-developing material on the inner wall of the shell, the humidity of the gas flowing through the shell can cause the color change of the water-absorbing color-developing material, so that the purpose of monitoring the humidity of the gas flowing through the ejector in real time is achieved.

[0020] In addition, the shell is designed as three parts of the air inlet section, the mixing pipe and the air outlet section connected in sequence, the air inlet section is used as the insertion of the nozzle and the part for introducing the gas from the suction port, the two streams of gas can be mixed in the mixing pipe cavity and discharged through the air outlet section part, so that the good injection effect is achieved. The air inlet section is designed as a converging shape, the gas introduction of the suction port can be well achieved, and the mixing of the two streams of gas is completed in the mixing pipe.

[0021] Another purpose of the present application is to provide a fuel cell system, wherein the ejector is arranged in the fuel cell system. The fuel cell system has the technical advantages of the above-mentioned ejector. BRIEF DESCRIPTION OF DRAWINGS

[0022] The accompanying drawings, which form a part of this application, are included to provide a further understanding of the application, and are incorporated in and constitute a part of this application. The embodiments of the present application and its drawings for explaining the present application are used to explain the present application, and the front and back, up and down and other orientation words involved therein only represent relative positional relationship, and do not constitute improper limitation on the present application. In the drawings:

[0023] Figure 1 The whole structure schematic view of the ejector according to the embodiment of the present application;

[0024] Figure 2 The half-section structure schematic view of the ejector according to the embodiment of the present application;

[0025] Figure 3 The structure schematic view of the ejector provided with the humidity sensor according to the embodiment of the present application;

[0026] Figure 4 The structure schematic view of the ejector coated with the water-absorbing color-developing material according to the embodiment of the present application;

[0027] Figure 5 The system composition schematic view of the fuel cell system according to the embodiment of the present application.

[0028] BRIEF DESCRIPTION OF DRAWINGS

[0029] 1, shell; 10, air inlet section; 100, suction port; 101, limiting boss; 11, mixing pipe; 110, window; 111, annular reinforcing rib; 112, longitudinal reinforcing rib; 12, air outlet section; 120, air outlet; 121, mounting boss; 122, mounting hole; 13, groove; 14, humidity sensor;

[0030] 2, nozzle; 20, backflow pipeline; 3, electric pile; 300, fuel gas inlet; 301, tail gas outlet;

[0031] 4, hydrogen supply unit; 40, hydrogen supply pressure sensor; 41, pressure relief valve;

[0032] 5, air supply unit; 6, cooling system;

[0033] 7, water vapor separator; 70, inlet; 71, exhaust port; 72, liquid discharge port;

[0034] 8, discharge valve; 800, external discharge pipeline. DETAILED DESCRIPTION

[0035] It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict.

[0036] In the description of the present application, it should be stated that if the terms indicating the orientation or positional relationship such as "up, down, left, right, front, back, inside and outside" appear, they are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application, and do not indicate or imply that the device or element must have a specific orientation, be constructed or operated in a specific orientation, so it cannot be understood as a limitation on the present application.

[0037] In addition, in the description of the present application, unless otherwise explicitly limited, the terms "mounting", "connecting", "connection", "connector" should be understood broadly. For example, the connection can be fixed connection, or detachable connection, or integral connection; can be mechanical connection, or electrical connection; can be directly connected, or indirectly connected through an intermediate medium, or the internal communication of two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood in combination with the specific circumstances.

[0038] The present application will be described in detail below with reference to the drawings and in combination with the embodiments.

[0039] Embodiment one

[0040] The present embodiment relates to an ejector applied to a fuel cell system, which is convenient for real-time monitoring of the humidity of the gas flowing through the ejector; an exemplary structure thereof is shown in Figure 1 and Figure 2 .

[0041] Overall, the ejector includes a shell 1 through which the gas flows, the shell 1 is coated with or mixed with a water-absorbing color-developing material, and the water-absorbing color-developing material can cause the shell 1 to exhibit different colors as the humidity of the gas flowing through the shell 1 changes.

[0042] It should be pointed out that based on the overall design idea, the technical scheme of the utility model can adopt various different specific implementation structures, forms or configuration sequences. For example, the shell 1 can adopt different specific implementation forms such as coating a water-absorbing color-developing material on the inner wall of the shell 1 or mixing a water-absorbing color-developing material in the injection molding base material of the shell 1. Of course, the shell 1 can also be configured with the humidity sensor 14, and the configuration position of the humidity sensor 14 on the shell 1, the specific setting sequence and device mode of the humidity sensor 14 and the nozzle 2 on the shell 1 and the like can also be flexibly adjusted. For the parts required by the overall scheme implementation but not involved in the overall setting described above, reasonable and flexible design can be made by referring to the mature setting means in the field, the actual situation during implementation and the like. The specific implementation scheme described below in the embodiment is only one of the relatively optimal schemes formed by the various combinations and changes of the above, and in actual implementation, the person skilled in the art can make flexible adjustment and improvement in combination with the actual situation. Obviously, the various specific form combinations and changes of the above can form many schemes, and the specific implementation scheme of the embodiment is within the protection scope of the utility model.

[0043] Specifically, the shell 1 of the embodiment includes a gas inlet section 10, a mixing pipe 11 and a gas outlet section 12 connected in sequence, wherein the end of the gas inlet section 10 is provided with a suction port 100, the nozzle 2 is inserted into the gas inlet section 10 from the suction port 100, and the end of the gas outlet section 12 is provided with a gas outlet 120. The shell 1 is designed as three parts of the gas inlet section 10, the mixing pipe 11 and the gas outlet section 12 connected in sequence, the gas inlet section 10 serves as the part of the nozzle 2 insertion and gas introduction from the suction port 100, the two gas streams can be mixed in the inner cavity of the mixing pipe 11 and then diffused and discharged through the gas outlet section 12, so that good injection effect is achieved.

[0044] Based on the above setting, the inner cavity of the gas inlet section 10 of the embodiment is preferably designed as a form that the inner diameter size gradually decreases from the end of the gas inlet section 10 to the direction of the mixing pipe 11, and the inner cavity of the mixing pipe 11 is designed as a form that the inner diameter size gradually increases from the gas inlet section 10 to the direction of the gas outlet section 12. The gas inlet section 10 is designed as a constricted shape, and after the nozzle 2 is inserted, the gas flowing into the suction port 100 can be well guided, so that the two gas streams are mixed in the mixing pipe 11.

[0045] In addition, as shown in FIG. 2, the nozzle 2 is provided with a plurality of gas injection holes 200, and the gas injection holes 200 are arranged in the form of a plurality of rows of holes. Figure 2 or Figure 3As shown, the mixing pipe 11 of the embodiment is configured as a horn with gradually increasing radial dimension, and the gas mixed by the mixing pipe 11 can be diffused and discharged, which not only helps to enhance the mixing and flow guiding effects of the ejector, but also helps to smoothly discharge the mixed gas due to the large inner cavity size of the gas outlet section 12. Based on the large size of the mixing pipe 11, the humidity sensor 14 can be arranged in the mixing pipe 11, which can well realize the integrated arrangement of the humidity sensor 14 on the ejector, and then the humidity sensor 14 can be used to monitor the humidity of the gas in real time, and the detected signal can be transmitted to a display instrument, a control unit or the like for display and monitoring.

[0046] In addition, grooves 13 for sleeving sealing rings can also be arranged on the outer circumferential surfaces of the gas inlet section 10 and the gas outlet section 12; by sleeving the sealing rings in the grooves 13, when the backflow pipe 20 is inserted into the gas inlet section 10, and the pipe connected to the gas inlet 300 of the stack 3 is inserted into the gas outlet section 12, a good seal can be formed. In addition, reinforcing ribs can also be arranged on the outer wall of the mixing pipe 11; specifically, the mixing pipe 11 of the embodiment is provided with a plurality of longitudinal reinforcing ribs 112 arranged along the length direction of the mixing pipe 11, and a plurality of annular reinforcing ribs 111 arranged along the circumferential direction of the mixing pipe 11, and the longitudinal reinforcing ribs 112 and the annular reinforcing ribs 111 are cross-connected, which can effectively improve the overall structural strength of the ejector.

[0047] At the same time, a limiting boss 101 is formed on the outer wall of the connection between the gas inlet section 10 and the mixing pipe 11, and the limiting boss 101 is used to limit the insertion depth of the pipe inserted into the gas inlet section 10; similarly, a mounting boss 121 can also be formed on the outer wall of the connection between the gas outlet section 12 and the mixing pipe 11, which can not only limit the insertion depth of the pipe, but also can be provided with a mounting hole 122 for mounting the ejector on the mounting boss 121.

[0048] In combination with the overall structure of the above-described injector, the embodiment adopts a manner of mixing or coating the water-absorbing color-developing material in the shell 1. When the humidity of the gas flowing through the shell 1 changes, the water-absorbing color-developing material will change accordingly, thereby causing the shell 1 to present different colors. In this way, the color change of the shell 1 can indicate the humidity change of the gas in the shell 1 on site. The water-absorbing color-developing material can be an existing material, such as a water-absorbing color-changing resin. When the water-absorbing color-developing material is mixed in the shell 1, the shell 1 is integrally injection molded, and the water-absorbing color-developing material is mixed in the injection molding base material of the shell 1. The shell 1 is made of plastic or other materials. Before injection molding, the water-absorbing color-developing material is mixed in the base material of the shell 1, and then the shell 1 is injection molded. When the humidity of the gas flowing through the shell 1 changes, the shell 1 can change color. The color change of the shell 1 can be observed in real time from the outside. With the help of a pre-marked humidity and color correspondence table or data, the humidity of the gas in the shell 1 can be understood in a timely manner.

[0049] When the water-absorbing color-developing material is coated on the inner wall of the shell 1, at least part of the shell 1 should be made of transparent material, and the water-absorbing color-developing material is coated on the inner wall of the transparent part of the shell 1. Specifically, as shown in Figure 4 The water-absorbing color-developing material can be coated on the inner wall of the transparent plate. The color-developing reagent solution is coated on the inner wall of the transparent plate, and then the solution is evaporated and crystallized to condense on the surface of the transparent plate. The water vapor contained in the gas flowing through the inside of the shell 1 is absorbed by the water-absorbing color-developing material and changes; the water-absorbing color-developing material needs to be calibrated after being coated, for example, 0.1 g / s, 0.2 g / s, 0.3 g / s, … of liquid water can be injected into the shell 1 respectively, and the color change under different water amounts is observed, and the corresponding results of the liquid water amount and the color development are recorded. The color change of the sample body during the operation of the fuel cell system is recorded and compared with the calibration results, so as to confirm the humidity of the gas in the injector during the operation of the fuel cell system.

[0050] The whole or part of the shell 1 is made of transparent material, and the inner wall of the transparent part is coated with water-absorbing color-changing material. The water-absorbing color-changing material changes with the humidity of the gas flowing through the inside of the shell 1, and the change of the water-absorbing color-changing material can be observed from the outside of the shell 1. Similarly, by means of a pre-labeled humidity and color correspondence table or data, the humidity of the gas in the shell 1 can be known in time. Based on the characteristics of the mixing pipe 11 being generally straight, a window 110 is formed on the side wall of the mixing pipe 11, the window 110 is blocked by a transparent plate such as glass or transparent plastic plate, and the water-absorbing color-changing material is coated on the inner wall of the transparent plate. The color change of the water-absorbing color-changing material can be observed in real time by using the window 110. The method has the advantages of simple processing structure and easy technical implementation.

[0051] In addition, as mentioned above, for the configuration of the humidity detection, of course, there are other auxiliary solutions to choose from. For example, as shown in Figure 3 The humidity sensor 14 can be arranged in the mixing pipe 11 at the same time; the humidity sensor 14 can be in the form of on-site indication or signal remote transmission. When the humidity sensor 14 is in the form of on-site indication, the display table is located on the outer wall of the mixing pipe 11. When the humidity sensor 14 is in the form of remote transmission, the signal detected by the humidity sensor 14 can be transmitted to a display instrument or a control unit through a signal line for display and control.

[0052] As described above, the ejector of the embodiment uses the high-pressure high-speed gas supplied by the nozzle 2 to introduce the low-pressure gas connected to the suction port 100 into the inside of the shell 1, and the two gases are mixed in the shell 1 and then supplied from the gas outlet 120. By integrating the humidity sensor 14 in the shell 1, or mixing the water-absorbing color-changing material in the shell 1, or coating a layer of water-absorbing color-changing material on the inner wall of the shell 1, the humidity of the gas flowing through the shell 1 can be detected by the humidity sensor 14 or cause the color change of the water-absorbing color-changing material, thereby achieving the purpose of real-time monitoring of the humidity of the gas flowing through the ejector.

[0053] Embodiment Two

[0054] The embodiment relates to a fuel cell system provided with the ejector of embodiment one; an exemplary system structure is shown in Figure 5

[0055] ​Specifically, the fuel cell system has the air supply unit 5 and the cooling system 6 connected with the stack 3, the air supply unit 5 is used to provide treated air for the stack 3, and the cooling system 6 is used to cool the stack 3. The gas inlet 300 of the stack 3 is connected with the gas outlet 120 on the shell 1 to receive hydrogen gas supplied from the hydrogen supply unit 4, and the tail gas outlet 301 of the stack 3 discharges tail gas. The hydrogen supply unit 4 supplies hydrogen gas for the stack 3 through the ejector, and the tail gas discharged from the tail gas outlet 301 of the stack 3 is separated by the water-gas separator 7. The hydrogen supply unit 4 is connected with the nozzle 2 of the ejector to supply high-pressure and high-speed gas to the shell 1, and a hydrogen supply pressure sensor 40 can be arranged on the pipeline between the hydrogen supply unit 4 and the nozzle 2 to detect whether the pressure of the pipeline exceeds a safety threshold, and when the safety threshold is exceeded, the pressure relief valve 41 on the emptying branch can be controlled to discharge the high-pressure hydrogen gas to the external discharge pipeline 800.

[0056] The tail gas outlet 301 is connected with the inlet 70 of the water-gas separator 7 through a pipeline, the gas outlet 71 of the water-gas separator 7 is connected with the return pipeline 20, the end of the return pipeline 20 is inserted into the outside of the air inlet section 10, and the sealing ring sleeved in the groove 13 on the air inlet section 10 is used to realize the sealing between the return pipeline 20 and the shell 1; meanwhile, the nozzle 2 can penetrate into the return pipeline 20 and be inserted into the inside of the air inlet section 10; in this way, the gas separated by the water-gas separator 7 can reach the air inlet section 10 through the return pipeline 20 and flow into the mixing pipeline 11 under the flow of the hydrogen gas sprayed by the nozzle 2. The liquid outlet 72 of the water-gas separator 7 is connected with the external discharge pipeline 800 through the discharge valve 8 to discharge the separated water to the outside. In order to ensure that the hydrogen gas provided by the hydrogen supply unit 4 meets the requirements of suitable temperature, pressure and flow rate, the fuel cell system is also provided with a plate heat exchanger, a flow control valve and the like to heat the low-temperature hydrogen gas supplied by the hydrogen storage system, adjust the supply amount according to the hydrogen flow rate required by different power points of the stack, and meet the requirements of the pressure, flow rate and temperature of the hydrogen gas at the inlet of the stack.

[0057] The fuel cell system of the embodiment can monitor the humidity of the hydrogen gas entering the stack 3 in real time by using the shell 1, the real-time data of the monitoring is an important parameter for evaluating the liquid water content at the anode inlet of the stack 3, and thus the operation stability and safety of the fuel cell system can be improved.

[0058] The above description is only a preferred embodiment of the present application, and the detailed configuration explanation, specific structure setting example, or assembly connection mode expression is for the need of full disclosure, so that the technical personnel can better implement the present application, and is not used to limit the protection scope of the present application. Any modification, equivalent replacement, improvement, etc. within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. An ejector applied to a fuel cell system, characterized in that: a housing (1) through which a gas flows is coated with or mixed with a water-absorbing color-developing material, and the water-absorbing color-developing material can change the color of the housing (1) with the humidity of the gas flowing through the housing (1), and the gas includes the gas entering the stack of the fuel cell system from the anode inlet of the fuel cell system.

2. The ejector according to claim 1, characterized in that: the housing (1) is integrally injection molded, and the water-absorbing color-developing material is mixed in the injection molding base material of the housing (1).

3. The ejector according to claim 1, characterized in that: at least part of the housing (1) is made of a transparent material, and the water-absorbing color-developing material is coated on the inner wall of the transparent part of the housing (1).

4. The ejector according to any one of claims 1 to 3, characterized in that: the housing (1) includes a gas inlet section (10), a mixing pipe (11), and a gas outlet section (12) connected in sequence, the end of the gas inlet section (10) is provided with a suction inlet (100) for inserting a nozzle (2), and the end of the gas outlet section (12) is provided with a gas outlet (120).

5. The ejector according to claim 4, characterized in that: a window (110) is provided on the side wall of the mixing pipe (11), the window (110) is blocked by a transparent plate, and the inner wall of the transparent plate is coated with the water-absorbing color-developing material.

6. The ejector according to claim 4, characterized in that: the inner diameter of the gas inlet section (10) is gradually reduced from the end of the gas inlet section (10) towards the mixing pipe (11), and the inner diameter of the mixing pipe (11) is gradually increased from the gas inlet section (10) towards the gas outlet section (12).

7. The ejector according to claim 4, characterized in that: a groove (13) for sleeving a sealing ring is provided on the outer periphery of the gas inlet section (10) and the gas outlet section (12); and / or, a reinforcing rib is provided on the outer wall of the mixing pipe (11).

8. The ejector according to claim 4, characterized in that: a limiting boss (101) is formed on the outer wall at the connection between the gas inlet section (10) and the mixing pipe (11), the limiting boss (101) is used to limit the insertion depth of a pipeline inserted into the gas inlet section (10); and / or, a mounting boss (121) is formed on the outer wall at the connection between the gas outlet section (12) and the mixing pipe (11), and the mounting boss (121) is provided with a mounting hole (122) for mounting the ejector.

9. The ejector according to claim 4, characterized in that: a humidity sensor (14) is arranged in the mixing pipe (11).

10. A fuel cell system, characterized in that: the fuel cell system is provided with the ejector according to any one of claims 1 to 9. ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

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