Eductor test bench and test method

Abstract

The application provides an ejector test bench and a test method. The ejector test bench comprises a first air inlet channel, a second air inlet channel, an ejector, a mixing device, an outlet channel and a backflow channel. The ejector comprises a main path and a bypass path. The first air inlet channel is communicated with the bypass path, and the second air inlet channel is communicated with the main path. A mixing cavity is arranged in the mixing device. The outlet of the ejector is arranged at the inlet of the mixing cavity. The outlet of the mixing cavity is communicated with the outlet channel. Flow holes are arranged on the side wall of the mixing device. The backflow channel is communicated with the flow holes. The first air inlet channel, the second air inlet channel, the outlet channel and the backflow channel are arranged to simulate the working condition information of the fuel cell. The test of the ejector is realized without the fuel cell, so that the test cost is reduced and the verification time is shortened.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of fuel cell testing, and particularly relates to an ejector test bench and a test method. BACKGROUND

[0002] A fuel cell is a device that generates electricity while generating water through an electrochemical reaction of hydrogen and oxygen, and has advantages of high power generation efficiency, low environmental pollution, high specific energy, and low noise.

[0003] The ejector is a core component of the anode end circulation path, and functions to bring hydrogen that is not completely reacted out of the stack back to the stack.

[0004] The prior art needs to be installed on a fuel cell for testing, thereby having problems of high testing cost and long verification time. SUMMARY

[0005] In view of the problems in the prior art, the present application provides an ejector test bench and a test method, which at least partially solve the problems of high testing cost and long verification time in the prior art.

[0006] In a first aspect, the present application provides an ejector test bench, comprising a first gas inlet path, a second gas inlet path, an ejector, a mixing device, an outlet path, and a backflow path.

[0007] The ejector comprises a main path and a bypass path, the first gas inlet path is communicated with the bypass path, the second gas inlet path is communicated with the main path, the mixing device is provided with a mixing cavity, an outlet of the ejector is arranged at an inlet of the mixing cavity, an outlet of the mixing cavity is communicated with the outlet path, and a flow hole is arranged on a side wall of the mixing device and communicated with the backflow path.

[0008] Optionally, the first gas inlet path comprises:

[0009] a first hydrogen nozzle, a first pressure sensor, and a first flow meter, the first hydrogen nozzle is communicated with the bypass path of the ejector through a pipeline, and the first pressure sensor and the first flow meter are arranged on the pipeline between the first hydrogen nozzle and the bypass path.

[0010] Optionally, the second gas inlet path comprises:

[0011] a second hydrogen nozzle, a second pressure sensor, and a second flow meter, the second hydrogen nozzle is communicated with the main path of the ejector through a pipeline, and the second pressure sensor and the second flow meter are arranged on the pipeline between the second hydrogen nozzle and the main path.

[0012] Optionally, the outlet path comprises:

[0013] a third flow meter and a third pressure sensor, the third flow meter and the third pressure sensor being arranged on the pipe between the first throttle valve and the outlet of the mixing chamber.

[0014] Optionally, the return passage comprises:

[0015] a fourth flow meter and a fourth pressure sensor, the fourth flow meter and the fourth pressure sensor being arranged on the pipe between the second throttle valve and the flow hole.

[0016] Optionally, the ejector is provided with a main passage and a bypass passage, the bypass passage is arranged at the outer periphery of the main passage, and the main passage and the bypass passage are isolated from each other, an injection hole is arranged at the end of the main passage, a ring slit is arranged at the end of the bypass passage, a bypass hole is arranged on the side wall of the ejector, and the bypass hole is in communication with the bypass passage.

[0017] Optionally, the inlet diameter of the mixing device is greater than the outlet diameter.

[0018] In a second aspect, the embodiments of the present disclosure further provide an ejector test bench test method, based on the test bench of any one of the first aspect, the method comprises:

[0019] acquiring fuel cell working point information;

[0020] adjusting the outlet passage and the return passage so that the ejector outlet pressure and the return pressure are the same as the fuel cell out-stack pressure in the working point information;

[0021] adjusting the first inlet passage and the second inlet passage so that the ejector outlet flow is the same as the fuel cell in-stack flow in the working point information, and measuring the return flow in the return passage;

[0022] comparing the return flow with the fuel cell return flow data in the working point information, and obtaining a test result according to the comparison result.

[0023] Optionally, the adjusting the outlet passage and the return passage comprises adjusting the first throttle valve and the second throttle valve;

[0024] the adjusting the first inlet passage and the second inlet passage comprises adjusting the first hydrogen injection and the second hydrogen injection.

[0025] Optionally, the test result obtained according to the comparison result comprises:

[0026] if the return flow in the return passage is greater than the fuel cell return flow data, the ejector meets the set requirements.

[0027] The ejector test bench and the test method provided by the application, wherein the ejector test bench simulates the working condition information of the fuel cell through the first air inlet channel, the second air inlet channel, the outlet channel and the backflow channel, and realizes the test of the ejector without the fuel cell, so as to reduce the test cost and shorten the verification time. BRIEF DESCRIPTION OF DRAWINGS

[0028] The above and other objects, features and advantages of the present disclosure will become more apparent from the following detailed description when taken in conjunction with the accompanying drawings in which like reference characters refer to like parts throughout the different views of the drawings.

[0029] Figure 1 The principle block diagram of the ejector test bench provided by the embodiment of the present application is shown in the figure;

[0030] Figure 2 The structure schematic diagram of the ejector provided by the embodiment of the present application is shown in the figure;

[0031] Figure 3 The flow chart of the test method provided by the embodiment of the present application is shown in the figure; BRIEF DESCRIPTION OF DRAWINGS

[0033] 1-first hydrogen jet; 2-first pressure sensor; 3-first flow meter; 4-second hydrogen jet; 5-second pressure sensor; 6-second flow meter; 7-ejector; 8-mixing chamber; 9-third flow meter; 10-third pressure sensor; 11-first throttle valve; 12-second throttle valve; 13-fourth flow meter; 15-fourth pressure sensor; 701-main path, 702-bypass, 703-ring gap, 704-jet hole. DETAILED DESCRIPTION

[0034] The embodiments of the present application will be described in detail below with reference to the accompanying drawings.

[0035] It should be apparent that the following describes only some embodiments of the present application and not all embodiments of the present application. The present application can be implemented or applied in other different specific embodiments, and the details in the specification can be modified or changed based on different views and applications without departing from the spirit of the present application. It should be noted that the following embodiments and features in the embodiments can be combined with each other without conflict. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0036] It is important to note that the various aspects described throughout this disclosure can be implemented in any of numerous ways, as will be apparent to those skilled in the art. Examples of specific implementations and / or, however, are described below.

[0037] It is also important to note that the diagram provided in the following embodiments merely illustrates the basic idea of the present disclosure, and only the components related to the present disclosure are shown in the diagram, not the number, shape and size of the components as in actual implementation. The shape, number and proportion of each component in actual implementation can be arbitrarily changed, and the layout of the components can also be more complex.

[0038] In addition, in the following description, specific details are provided to facilitate thorough understanding of examples. However, one skilled in the art will understand that the aspects described can be practiced without these specific details.

[0039] Fuel cell: an electrochemical reaction device, in which hydrogen and oxygen react in two half-electrodes to generate water, thereby converting chemical energy into electrical energy, accompanied by conversion into heat energy due to efficiency loss.

[0040] Ejector: a gas circulation device for anode hydrogen circulation, which uses a high-speed gas to inject a low-speed gas, and the jet is injected into the mixing chamber through a converging nozzle, surrounded by the injected flow.

[0041] For ease of understanding, as shown in Figure 1 The embodiment discloses an ejector 7 test bench, which comprises a first inlet passage, a second inlet passage, an ejector 7, a mixing device, an outlet passage and a backflow passage.

[0042] The ejector 7 comprises a main path 701 and a bypass path 702, the first inlet passage is communicated with the bypass path 702, the second inlet passage is communicated with the main path 701, a mixing chamber 8 is arranged in the mixing device, the outlet of the ejector 7 is arranged at the inlet of the mixing chamber 8, the outlet of the mixing chamber 8 is communicated with the outlet passage, and a flow hole is arranged on the side wall of the mixing device, and the backflow passage is communicated with the flow hole.

[0043] Optionally, the first inlet passage comprises: a first hydrogen jet 1, a first pressure sensor 2 and a first flow meter 3, the first hydrogen jet 1 is communicated with the bypass 702 of the ejector 7 through a pipeline, and the first pressure sensor 2 and the first flow meter 3 are arranged on the pipeline between the first hydrogen jet 1 and the bypass 702.

[0044] Optionally, the second inlet passage comprises: a second hydrogen jet 4, a second pressure sensor 5 and a second flow meter 6, the second hydrogen jet 4 is communicated with the main path 701 of the ejector 7 through a pipeline, and the second pressure sensor 5 and the second flow meter 6 are arranged on the pipeline between the second hydrogen jet 4 and the main path 701.

[0045] Optionally, the outlet passage comprises: a third flow meter 9, a third pressure sensor 10 and a first throttle valve 11, the first throttle valve 11 is communicated with the outlet of the mixing chamber 8 through a pipeline, and the third flow meter 9 and the third pressure sensor 10 are arranged on the pipeline between the first throttle valve 11 and the outlet of the mixing chamber 8.

[0046] Optionally, the return passage comprises: a fourth pressure sensor 15, a fourth flow meter 13 and a second throttle valve 12, the second throttle valve 12 is communicated with the flow hole through a pipeline, and the fourth pressure sensor 15 and the fourth flow meter 13 are arranged on the pipeline between the second throttle valve 12 and the flow hole.

[0047] As shown in Figure 2 The main path channel and the bypass channel are arranged in the ejector 7, the bypass channel is arranged at the outer periphery of the main path channel, and the main path channel and the bypass channel are isolated from each other, the end of the main path channel is provided with a jet hole 704, the end of the bypass channel is provided with an annular gap 703, and a bypass through hole is arranged on the side wall of the ejector 7 and communicated with the bypass channel.

[0048] Optionally, the inlet diameter of the mixing device is greater than the outlet diameter.

[0049] As shown in Figure 3 The embodiment discloses a test method of the test bench of the ejector 7, which comprises the following steps:

[0050] Step S301: obtaining fuel cell working point information;

[0051] The working point information comprises fuel cell inlet pressure, outlet pressure, inlet flow, outlet flow and return flow.

[0052] Step S302: adjusting the outlet passage and the return passage, so that the outlet pressure of the ejector 7 and the return pressure are the same as the fuel cell outlet pressure in the working point information;

[0053] In one example, the first throttle valve 11 and the second throttle valve 12 are adjusted so that the ejector outlet pressure and the backflow pressure are consistent with the fuel cell stack outlet pressure in the working condition point information.

[0054] Step S303: The first intake passage and the second intake passage are adjusted so that the ejector 7 outlet flow rate is the same as the fuel cell stack inlet flow rate in the working condition point information, and the backflow flow rate in the backflow passage is measured.

[0055] In one specific example, the first hydrogen jet 1 and the second hydrogen jet 4 are adjusted so that the ejector 7 outlet flow rate is the same as the fuel cell stack inlet flow rate in the working condition point information.

[0056] The second hydrogen jet 4 provides the main jet flow rate, and the first hydrogen jet 1 is opened to supplement the bypass to obtain the backflow flow rate when the main flow rate cannot meet the requirement.

[0057] Step S304: The backflow flow rate is compared with the fuel cell stack backflow flow rate data in the working condition point information, and the test result is obtained according to the comparison result.

[0058] Optionally, the test result obtained according to the comparison result includes:

[0059] If the backflow flow rate in the backflow passage is greater than the fuel cell stack backflow flow rate data, the ejector 7 meets the set requirement.

[0060] If the backflow flow rate in the backflow passage is not greater than the fuel cell stack backflow flow rate data, the ejector 7 does not meet the set requirement.

[0061] Steps S301 to S304 are repeated to measure the backflow flow rate of each working condition point of the fuel cell, and whether the result is qualified is confirmed.

[0062] The basic principles of the present disclosure are described above in combination with specific examples, but it should be noted that the advantages, advantages, effects, etc. mentioned in the present disclosure are only examples and are not limited, and these advantages, advantages, effects, etc. cannot be considered as the necessity of each embodiment of the present disclosure. In addition, the above specific details of the disclosure are only for the purpose of example and for the purpose of understanding, and are not limited to the above specific details. The above specific details do not limit the present disclosure to the above specific details.

[0063] In this disclosure, relational terms such as first and second and the like can be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. The block diagram of the devices, apparatus, equipment, systems referred to in this disclosure is merely illustrative and not intended to imply the necessity or arrangement of the connections, arrangement, configuration as shown in the block diagram. As will be appreciated by those skilled in the art, the devices, apparatus, equipment, systems can be connected, arranged, configured in any way. The words "comprising," "containing," "including," "having," and the like, are to be construed open-ended, meaning "including but not limited to," and are to be taken in their broadest context. The words "or" and "and" as used herein, mean "and / or," and are to be taken in their broadest context, unless the context clearly indicates otherwise. The word "comprising" as used herein, means "comprising but not limited to," and is to be taken in its broadest context.

[0064] Also, as used in this disclosure, "or" as used in the context of items A and B as "at least one of A or B" indicates a disjunction, such that, for example, a disjunction of "at least one of A, B, or C" means A or B or C, or AB or AC or BC, or ABC (i.e., A and B and C). Furthermore, the word "example" is not meant to convey that a described example is preferred or better than other examples.

[0065] It is also important to note that the systems and methods of the disclosure can be embodied in a variety of forms including, but not limited to, a data processor, a computer program product, a computer, one or more components of a computer, software, and combinations of the same. In this disclosure, the term "data processor" means any processor containing one or more processors that retrieves instructions and data from, and writes information to, a memory, whether local or remote. Also, it is understood that the systems and methods of the disclosure can be located on one computer, or can be distributed among several computers or components thereof.

[0066] Various changes, modifications and improvements in the herein described technologies can be made within the teachings of the technology, as defined by the appended claims, without departing from the technical teachings of the disclosure. Further, the aspects of the claims to the disclosure are not limited to the specific aspects described hereinabove. A person of ordinary skill in the art will readily recognize that the technology can be practiced with a variety of processing, machine, manufacture, event of constituent, means, methods and actions, other than those described hereinabove without departing from the scope of the claims to the disclosure. Accordingly, the appended claims are intended to encompass within their scope all such processes, machines, manufacture, event of constituent, means, methods and actions.

[0067] The above description of the disclosed aspects is intended to be illustrative and not restrictive. Many embodiments of the disclosure will readily suggest themselves to those skilled in the art having the benefit of this disclosure. Accordingly, the disclosure is not intended to be limited to the aspects described hereinabove, but instead the claims are intended to cover all aspects of the technology which come within the scope and the spirit of the claims. The patentable scope of the disclosure is defined by the claims, and can include other aspects that carry out the spirit or principles of the disclosure.

[0068] The foregoing description has been presented for the purposes of illustration and description. Furthermore, the description is not intended to limit the embodiments of the disclosure to the forms disclosed herein. Although the various example aspects and embodiments have been described herein with regard to particular aspects and embodiments, those skilled in the art will recognize that certain modifications, changes, substitutions, additions and sub-combinations can be made without departing from the spirit of the disclosure.

Claims

1. A method for testing an ejector test bench, characterized in that: The test was conducted on a test bench, which included a first air intake passage, a second air intake passage, an ejector, a mixing device, an outlet passage, and a return passage; the ejector included a main passage and a bypass, the first air intake passage was connected to the bypass, the second air intake passage was connected to the main passage, a mixing chamber was provided in the mixing device, the outlet of the ejector was provided at the inlet of the mixing chamber, the outlet of the mixing chamber was connected to the outlet passage, a flow hole was provided on a side wall of the mixing device, and the return passage was connected to the flow hole; The method includes: obtaining fuel cell operating point information; adjusting the outlet passage and the reflux passage so that the ejector outlet pressure and the reflux pressure are the same as the fuel cell stack outlet pressure in the operating point information; adjusting the first air inlet passage and the second air inlet passage so that the ejector outlet flow is the same as the fuel cell stack inlet flow in the operating point information, and measuring the reflux flow in the reflux passage; comparing the reflux flow with the fuel cell reflux flow data in the operating point information, and obtaining a test result based on the comparison result.

2. The ejector test bench testing method according to claim 1, characterized in that: The first air intake passage includes: a first hydrogen jet, a first pressure sensor and a first flow meter. The first hydrogen jet is connected to a bypass of the ejector through a pipeline. The first pressure sensor and the first flow meter are arranged on the pipeline between the first hydrogen jet and the bypass.

3. The ejector test bench testing method according to claim 2, characterized in that: The second air intake passage includes: a second hydrogen jet, a second pressure sensor and a second flow meter. The second hydrogen jet is connected to the main path of the ejector through a pipeline. The second pressure sensor and the second flow meter are arranged on the pipeline between the second hydrogen jet and the main path.

4. The ejector test bench testing method according to claim 3, characterized in that: The outlet passage includes: a third flow meter, a third pressure sensor and a first throttle valve, the first throttle valve is connected to the outlet of the mixing chamber through a pipeline, and the third flow meter and the third pressure sensor are arranged on the pipeline between the first throttle valve and the outlet of the mixing chamber.

5. The ejector test bench testing method according to claim 4, characterized in that: The reflux passage includes: a fourth pressure sensor, a fourth flow meter and a second throttle valve, the second throttle valve is connected to the flow hole through a pipeline, and the fourth pressure sensor and the fourth flow meter are arranged on the pipeline between the second throttle valve and the flow hole.

6. The ejector test bench testing method according to claim 1, characterized in that: A main channel and a bypass channel are provided in the ejector, the bypass channel is provided on the periphery of the main channel, and the main channel and the bypass channel are isolated from each other, a spray hole is provided at the end of the main channel, an annular seam is provided at the end of the bypass channel, and a bypass through hole is provided on the side wall of the ejector, and the bypass through hole is connected to the bypass channel.

7. The ejector test bench testing method according to claim 1, characterized in that: The inlet diameter of the mixing device is larger than the outlet diameter.

8. The ejector test bench testing method according to claim 5, characterized in that: The adjusting of the outlet passage and the return passage includes adjusting the first throttle valve and the second throttle valve; the adjusting of the first intake passage and the second intake passage includes adjusting the first hydrogen injection and the second hydrogen injection.

9. The ejector test bench testing method according to claim 1, characterized in that: The test results are obtained based on the comparison results, including: if the reflux flow rate in the reflux path is greater than the reflux flow rate data of the fuel cell, the ejector meets the set requirements.

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