Detection device and detection system for flow controller

Abstract

The utility model provides a detection device and a detection system for a flow controller. The detection device comprises an inflow unit and an outflow unit connected with an outlet of the flow controller. The inflow unit comprises an inflow pipeline, an inlet of the inflow pipeline is used for being connected with an external fluid supply device, an outlet of the inflow pipeline is used for being connected with a to-be-measured flow controller, the inflow pipeline is sequentially provided with a first switch part and a pressure adjusting part, and the first switch part is used for controlling on-off of the inflow pipeline. The pressure regulating part is used for regulating the pressure of fluid flowing into the pipeline to a preset value; the outflow unit comprises an outflow pipeline communicated with the outside and a second switch part arranged on the outflow pipeline, the outflow pipeline is connected with an outlet of the flow controller, and the second switch part is used for controlling on-off of the outflow pipeline. According to the detection device for the flow controller, the influence of airflow fluctuation on fluctuation detection of the flow controller is reduced, so that the detection precision of the flow controller is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of flow controller detection, in particular to a flow controller detection device and also to a flow controller detection system provided with the flow controller detection device. Background Art

[0002] A hydrogen fuel cell is a power generation device that directly converts the chemical energy of hydrogen and oxygen into electrical energy. Its basic principle is that hydrogen passes through a hydrogen electrode, and the hydrogen molecules in the hydrogen are precipitated into hydrogen ions and electrons under the action of a catalyst. The hydrogen ions are transferred to the cathode through a proton exchange membrane, and undergo a redox reaction with oxygen to generate water and heat energy. Among them, the electrons pass through an external load to generate current, thereby realizing the conversion of electrical energy.

[0003] The operation of fuel cells requires a certain hydrogen flow and air flow, and the flow rate will affect the output power and efficiency of the fuel cell. As a key component of flow control, the performance of the gas flow controller directly affects the accuracy and reliability of the test parameters. Utility Model Content

[0004] In view of this, the utility model aims to provide a detection device for a flow controller, which can reduce the fluctuation of fluid flow during the test process and is conducive to detecting the performance of the flow controller.

[0005] In order to achieve the above object, the technical solution of the utility model is implemented as follows:

[0006] A detection device for a flow controller, comprising an inflow unit connected to an inlet of a flow controller to be tested, and an outflow unit connected to an outlet of the flow controller; the inflow unit comprises an inflow pipeline, the inlet of the inflow pipeline is used to be connected to an external fluid supply device, the outlet of the inflow pipeline is used to be connected to the flow controller, along the flow path of the fluid, a first switch part and a pressure regulating part are sequentially arranged on the inflow pipeline, the first switch part is used to control the on and off of the inflow pipeline, and the pressure regulating part is used to adjust the fluid pressure in the inflow pipeline to a preset value;

[0007] The outflow unit includes an outflow pipeline communicating with the outside, and a second switch portion arranged on the outflow pipeline, the outflow pipeline is connected to the outlet of the flow controller, and the second switch portion is used to control the on-off of the outflow pipeline.

[0008] Furthermore, along the flow path of the fluid, an inflow pressure detection unit located downstream of the pressure regulating unit is provided on the inflow pipeline, and the inflow pressure detection unit is used to detect the fluid pressure in the inflow pipeline.

[0009] Furthermore, the inflow pressure detection unit includes a first pressure gauge and / or a first pressure transmitter provided on the inflow pipeline.

[0010] Furthermore, along the flow path of the fluid, an outflow pressure detection unit located upstream of the second switch unit is provided on the outflow pipeline.

[0011] Furthermore, the outflow pressure detection unit includes a second pressure gauge and / or a second pressure transmitter arranged on the outflow pipeline.

[0012] Furthermore, the inflow pipeline includes a main pipeline and a plurality of branch pipelines connected in parallel downstream of the main pipeline, and each branch pipeline is provided with a third switch unit;

[0013] The flow areas of the plurality of branch pipelines are all different, and the main pipeline is connected to the flow controller via one of the branch pipelines.

[0014] Furthermore, each of the branch pipes is provided with a third pressure detection unit, and the third pressure detection unit is used to detect the fluid pressure in the branch pipe.

[0015] Furthermore, the third pressure detection unit includes a third pressure transmitter arranged on the branch pipeline.

[0016] Furthermore, each of the branch pipes comprises a first pipe body and a second pipe body connected to each other;

[0017] The first pipe body is connected to the main pipe, and the second pipe body is a hose for connecting to the flow controller.

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

[0019] The detection device for a flow controller described in the utility model can, when performing fluctuation detection on the flow controller, open the first switch part and the second switch part to allow external fluid to flow through the flow controller, and adjust the pressure of the fluid flowing into the pipeline to a preset value and maintain it through the pressure regulating part, which is beneficial to reducing the impact of airflow fluctuations on the fluctuation detection of the flow controller, thereby helping to improve the detection accuracy.

[0020] The detection device for the flow controller has a simple structure and is easy to arrange and implement, which is not only conducive to reducing production and detection costs, but also has good detection efficiency and detection accuracy.

[0021] In addition, another object of the present invention is to provide a flow controller detection system, comprising the detection device for the flow controller as described above, and a control module; the control module is electrically communicated with the first switch part, the second switch part, the pressure regulating part and the flow controller.

[0022] The flow controller detection system described in the utility model is connected to the first switch part, the second switch part and the voltage regulating part through electrical communication with the control module, which can facilitate the automatic detection of the flow controller, thereby facilitating the improvement of the detection efficiency of the flow controller. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The accompanying drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention. In the accompanying drawings:

[0024] Figure 1 It is a structural schematic diagram of a detection device for a flow controller according to an embodiment of the utility model.

[0025] Description of reference numerals:

[0026] 1. Main pipeline; 2. Branch pipeline; 3. Flow controller; 4. Outflow pipeline;

[0027] 100, inflow pipeline; 101, first switch valve; 102, pressure regulating valve; 103, filter; 104, first pressure gauge; 105, first pressure transmitter;

[0028] 201, a third switch valve; 202, a third pressure transmitter;

[0029] 401. A second switch valve; 402. A second pressure transmitter. DETAILED DESCRIPTION

[0030] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other.

[0031] In the description of the present invention, it should be noted that if there are terms indicating orientation or positional relationship such as "upper", "lower", "inner", "back", etc., they are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, if there are terms such as "first", "second", etc., they are also used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0032] The present invention will be described in detail below with reference to the accompanying drawings and in combination with embodiments.

[0033] This embodiment relates to a detection device for a flow controller, including an inflow unit connected to the inlet of the flow controller 3 to be tested, and an outflow unit connected to the outlet of the flow controller 3.

[0034] Among them, the inflow unit includes an inflow pipeline 100, the inlet of the inflow pipeline 100 is used to be connected to an external fluid supply device, and the outlet of the inflow pipeline 100 is used to be connected to a flow controller 3. Along the flow path of the fluid, a first switch part and a pressure regulating part are sequentially provided on the inflow pipeline 100. The first switch part is used to control the on and off of the inflow pipeline 100, and the pressure regulating part is used to adjust the fluid pressure in the inflow pipeline 100 to a preset value.

[0035] The outflow unit includes an outflow pipeline 4 communicating with the outside, and a second switch portion arranged on the outflow pipeline 4 . The outflow pipeline 4 is connected to the outlet of the flow controller 3 . The second switch portion is used to control the on-off of the outflow pipeline 4 .

[0036] The detection device for the flow controller described in this embodiment adjusts and maintains the fluid pressure in the inflow pipeline to a preset value through a pressure regulating unit, which helps to reduce the impact of airflow fluctuations on the fluctuation detection of the flow controller, thereby helping to improve the detection accuracy.

[0037] The detection device for the flow controller described in this embodiment is not only simple in structure, easy to arrange and implement, and easy to operate, which is conducive to reducing the production cost of the detection device and the detection cost of the flow controller 3, but also has good detection efficiency and detection accuracy, which can improve the accuracy of the detection experiment or the accuracy of flow fluctuation detection.

[0038] Based on the above overall introduction, an exemplary structure of the detection device for the flow controller described in this embodiment is as follows: Figure 1 As shown in . The flow controller 3 can be specifically a gas mass flow controller 3 in the prior art, and the external fluid is preferably compressed air. The compressed air has no effect on the structure of the flow controller 3, so it will not damage the flow controller 3, and the cost of compressed air is low and easy to implement. Of course, the flow controller 3 can also be a liquid flow controller, in which case the external fluid is liquid.

[0039] As a preferred implementation mode, the inflow pipeline 100 in this embodiment includes a main pipeline 1, and a plurality of branch pipelines 2 connected in parallel downstream of the main pipeline 1, and a third switch unit is provided on each branch pipeline 2. The flow areas of the plurality of branch pipelines 2 are different, and the inflow pipeline 100 is connected to the flow controller 3 through one of its branch pipelines 2. By providing a plurality of branch pipelines 2 with different flow areas, the flow range of the fluid flowing through each branch pipeline 2 is different. During specific detection, the flow controller 3 can be matched with the branch pipeline 2 that is compatible with the flow range of itself, so as to improve the detection accuracy of the flow controller 3 and avoid the problem of large detection error caused by flow mismatch. The third switch unit includes a third switch valve 201 provided on each branch pipeline 2, and the third switch valve 201 here is preferably a solenoid valve.

[0040] As a structural example, there are three branch pipelines 2 in this embodiment, and the branch pipeline 2 with the smallest flow area is called the first branch pipeline, the branch pipeline 2 with the largest flow area is called the third branch pipeline, and the remaining branch pipelines 2 are called the second branch pipeline. The smaller the flow area, the smaller the flow rate of the fluid flowing through itself. Therefore, the flow rate corresponding to the first branch pipeline is a small flow rate, the flow rate corresponding to the second branch pipeline is a medium flow rate, and the flow rate corresponding to the third branch pipeline is a large flow rate. In specific implementation, the range of the flow rate corresponding to each branch pipeline 2 can be determined according to the use requirements. It can be understood that in specific implementation, the number of branch pipelines 2 and the flow range corresponding to the branch pipeline 2 can be adaptively adjusted according to the use requirements.

[0041] For example, the flow rate of the fluid flowing through the first branch pipeline is less than 40NLPM, the flow rate of the fluid flowing through the second branch pipeline is between 40NLPM-500NLPM, and the flow rate of the fluid flowing through the third branch pipeline is greater than 500NLPM. During the specific detection, the corresponding branch pipeline 2 and flow controller 3 are connected according to the flow range of the branch pipeline 2 in which the flow controller 3 to be tested is within.

[0042] As a preferred implementation, in this embodiment, each branch pipeline 2 includes a first pipe body and a second pipe body connected to each other, wherein the first pipe body is connected to the main pipeline 1, and the second pipe body is a hose and is used to connect to the flow controller 3. Here, the second pipe body is a hose, which is conducive to improving the convenience and flexibility of connecting the branch pipeline 2 and the flow controller 3. The hose can be detachably connected to the inlet of the flow controller 3 through a pipe joint in the prior art.

[0043] Continue to combine Figure 1 As shown in , the first switch part in this embodiment specifically includes a first switch valve 101 arranged on the main line 1, and the second switch part includes a second switch valve 401 arranged on the outflow line 4. The first switch valve 101 can be specifically a ball valve, and the second switch valve 401 is a solenoid valve. The structures of the two are simple, easy to arrange and implement, and have good use effects. The pressure regulating part includes a pressure regulating valve 102 arranged on the main line 1, which is conducive to adjusting the flow pressure in the main line 1 to a preset value, and is conducive to ensuring the stability of the fluid pressure, thereby avoiding the influence of poor detection accuracy caused by fluctuations in the gas supply pressure. In specific implementation, the preset value can be set to a specific value or value range according to the use requirements.

[0044] As a preferred embodiment, in this embodiment, along the air intake path, an inflow pressure detection unit is provided on the inflow pipeline 100, which is located downstream of the pressure regulating unit, and the inflow pressure detection unit is used to detect the fluid pressure in the inflow pipeline 100. In the specific arrangement, the inflow pressure detection unit is preferably arranged on the main pipeline 1, and the inflow pressure detection unit detects the air intake pressure of the fluid, which is conducive to verifying whether the pressure of the fluid after pressure regulation is appropriate.

[0045] Among them, along the intake path, Figure 1 The direction indicated by the arrow in the figure is the flow direction of the fluid. The inflow pressure detection unit in this embodiment includes a first pressure gauge 104 and a first pressure transmitter 105 arranged on the inflow pipeline 100. Among them, the first pressure gauge 104 and the first pressure transmitter 105 detect the fluid pressure. The two detection points are to prevent the fluid pressure from being detected when one of them has a problem. The cooperation between the first pressure gauge 104 and the first pressure transmitter 105 is also conducive to further determining the accuracy of pressure detection. Of course, it is also feasible to set only one of the first pressure gauge 104 and the first pressure transmitter 105.

[0046] As a preferred embodiment, each branch pipe 2 is provided with a third pressure detection unit, which is used to detect the fluid pressure in the branch pipe 2. Detecting the pressure of the fluid in the branch pipe 2 by the third pressure detection unit is helpful to ensure the stability of the fluid flowing into the flow controller 3, thereby improving the detection accuracy. Figure 1 As shown in , the third pressure detection unit in this embodiment includes a third pressure transmitter 202 arranged on the branch pipeline 2. The third pressure transmitter 202 has a simple structure, is easy to be arranged on the branch pipeline 2, and has good detection accuracy.

[0047] In this embodiment, an outflow pressure detection unit located upstream of the second switch unit is provided on the outflow pipeline 4 along the exhaust path. The outflow pressure detection unit detects the pressure in the outflow pipeline 4, which is conducive to further preventing the occurrence of low detection accuracy of the flow controller 3 due to unstable pressure in the outflow pipeline 4. The outflow pressure detection unit here includes a second pressure transmitter 402 provided on the outflow pipeline 4, which has a simple structure, is easy to arrange and implement, and has a good use effect.

[0048] Of course, a second pressure gauge can also be provided on the outflow pipeline 4. In this case, the cooperation between the second pressure gauge and the second pressure transmitter 402 is not only conducive to improving the detection accuracy, but also can detect the pressure through the other pair when a problem occurs in one of the two, thereby ensuring the use effect of the detection device. Of course, it is also feasible to provide only one of the second pressure gauge and the second pressure transmitter 402.

[0049] In addition, a filter 103 is provided between the first switch unit and the pressure regulating unit to filter the fluid to prevent impurities from entering the flow controller 3 and causing damage. It should be noted that the structures of the pressure gauge, pressure transmitter and filter 103 in this embodiment can all refer to the prior art.

[0050] The flow controller detection device in this embodiment is not only conducive to the fluctuation detection of the flow controller 3, but also can detect the leakage of the flow controller 3. The specific use method of the detection device is described in the following flow controller detection system.

[0051] In addition, the present embodiment also relates to a flow controller detection system, comprising the flow controller detection device as described above, and a control module. The control module is electrically connected to the first switch part, the second switch part, the pressure regulating part and the flow controller 3.

[0052] The flow controller detection system described in this embodiment is connected to the first switch part, the second switch part and the pressure regulating part as well as the flow controller 3 through electrical communication with the control device, which can facilitate the automatic detection of the flow controller, thereby facilitating the improvement of the detection efficiency of the flow controller 3.

[0053] As a preferred embodiment, the control module specifically includes a host computer, and the host computer has data processing software, and the flow controller 3 is connected to the host computer signal. In this way, the flow of the fluid flowing through the flow controller 3 can be controlled by the data processing software on the host computer, and the flow controller 3 also transmits the flow data flowing through itself to the host computer. The data processing software on the host computer can summarize the flow data of the flow controller 3 and generate a flow curve graph with the horizontal axis as time and the vertical axis as flow.

[0054] In this embodiment, when the flow controller detection device detects the fluctuation of the flow controller 3, it first opens the first switch valve 101, fills in the range of the measured flow controller 3 in the data processing software of the host computer and starts. When the range of the flow controller 3 is less than 40NLPM, the third switch valve 201 on the first branch pipeline is opened, and the fluid flows into the flow controller 3 through the first branch. When the range of the flow controller 3 is within the range of 40-500NLPM, the third switch valve 201 on the second branch is opened, and the fluid flows into the flow controller 3 through the second branch; when the range of the flow controller 3 is greater than 500NLPM, the third switch valve 201 on the third branch is opened, and the fluid flows into the flow controller 3 through the third branch, and the second switch valve 401 is opened at the same time, and the test starts according to the set program.

[0055] According to the range of the measured flow controller 3, the data processing software will ventilate for a certain time, such as one minute, at five set points of 10%, 30%, 50%, 70%, and 90% of the range of the flow controller 3. At this time, the main interface of the data processing software will display a flow curve with the horizontal axis as time and the vertical axis as flow. After the program is completed, the first switch valve 101 and the second switch valve 401 are closed, and the data processing software can take multiple (for example, five) maximum deviation values ​​(multiple deviation values ​​that differ greatly from the average value of the flow at the range set point) at each set point (10%, 30%, 50%, 70%, 90% of the range of the flow controller 3) according to the flow fluctuation data.

[0056] according to Formula, where xi represents the maximum deviation value of each set point, Represents the set value corresponding to each deviation value, n represents the number of data points 25 (each set point takes 5 maximum deviation points, a total of 25 points), and Σ represents the sum of all data points. Then, a set of data is automatically calculated through standard deviation / measurement range of the measured device. When the data is greater than the set value, it is determined that the measured flow controller 3 fluctuates greatly and cannot meet the use requirements. When the data is less than the set value, it is determined that the flow controller 3 can meet the use requirements. The set value here can be set according to the use requirements, for example, the set value is 0.1, etc.

[0057] When the flow controller detection device in this embodiment detects the leakage of the flow controller 3, first, the flow controller 3 to be tested is connected according to the first point in the flow fluctuation detection function. Then, the set detection pressure value is filled in the data processing software of the host computer, for example, 300KPa is set, and the program can be started.

[0058] The flow controller 3 and the first switch valve 101 are opened, and the pressure in the inflow pipeline 100 rises. When the value of the first pressure transmitter 105 reaches the set pressure value of 300KPa, the flow controller 3 and the first switch valve 101 are closed. After a delay of 5 seconds, the second switch valve 401 is opened to release the pressure in the outflow pipeline 4. The second switch valve 401 is closed after the second pressure transmitter 402 displays the external environment pressure (about 101KPa).

[0059] Then let it stand for 10 minutes. If the fluid can pass through the closed flow controller 3 and flow into the outflow pipeline 4, so that the pressure in the inflow pipeline 100 continues to drop, while the pressure in the outflow pipeline 4 rises, it means that the flow controller 3 is not closed tightly and there is an internal leakage problem in the flow controller 3. If the pressure in the inflow pipeline 100 drops, while the pressure in the outflow pipeline 4 remains unchanged, it means that the fluid does not flow into the outflow pipeline 4 through the flow controller 3. At this time, the drop in the pressure of the inflow pipeline 100 is due to the external leakage of the flow controller 3, that is, the sealing structure in the flow controller 3 is not sealed tightly, and the gas is directly discharged from the flow controller 3 to the outside. If the pressure in the inflow pipeline 100 and the outflow pipeline 4 does not change, it means that there is no leakage in the flow controller 3.

[0060] The flow controller detection system in this embodiment is not only conducive to the fluctuation detection and leakage detection of the flow controller 3, but also has high detection efficiency and accuracy, effectively solving the problem of the single detection method and low detection efficiency of the traditional flow controller 3, and has good practicality. In addition, the flow controller detection system can also realize the detection of flow controllers 3 with different ranges, and has good versatility.

[0061] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A detection device for a flow controller, characterized in that: It comprises an inflow unit connected to the inlet of a flow controller (3) to be tested, and an outflow unit connected to the outlet of the flow controller (3); The inflow unit comprises an inflow pipeline (100), the inlet of the inflow pipeline (100) is used to be connected to an external fluid supply device, the outlet of the inflow pipeline (100) is used to be connected to the flow controller (3), and along the flow path of the fluid, the inflow pipeline (100) is provided with a first switch part and a pressure regulating part in sequence, the first switch part is used to control the on and off of the inflow pipeline (100), and the pressure regulating part is used to adjust the fluid pressure in the inflow pipeline (100) to a preset value; The outflow unit comprises an outflow pipeline (4) communicating with the outside, and a second switch portion arranged on the outflow pipeline (4), wherein the outflow pipeline (4) is connected to the outlet of the flow controller (3), and the second switch portion is used to control the on and off of the outflow pipeline (4).

2. The detection device for a flow controller according to claim 1, characterized in that: Along the flow path of the fluid, an inflow pressure detection portion is provided on the inflow pipeline (100) and is located downstream of the pressure regulating portion. The inflow pressure detection portion is used to detect the fluid pressure in the inflow pipeline (100).

3. The detection device for a flow controller according to claim 2, characterized in that: The inflow pressure detection unit comprises a first pressure gauge (104) and / or a first pressure transmitter (105) arranged on the inflow pipeline (100).

4. The detection device for a flow controller according to claim 1, characterized in that: Along the flow path of the fluid, an outflow pressure detection unit located upstream of the second switch unit is provided on the outflow pipeline (4).

5. The detection device for a flow controller according to claim 4, characterized in that: The outflow pressure detection unit comprises a second pressure gauge and / or a second pressure transmitter (402) arranged on the outflow pipeline (4).

6. The detection device for a flow controller according to any one of claims 1 to 5, characterized in that: The inflow pipeline (100) comprises a main pipeline (1) and a plurality of branch pipelines (2) connected in parallel downstream of the main pipeline (1), and each branch pipeline (2) is provided with a third switch unit; The flow areas of the plurality of branch pipelines (2) are all different, and the main pipeline (1) is connected to the flow controller (3) via one of the branch pipelines (2).

7. The detection device for a flow controller according to claim 6, characterized in that: Each branch pipe (2) is provided with a third pressure detection unit, and the third pressure detection unit is used to detect the fluid pressure in the branch pipe (2).

8. The detection device for a flow controller according to claim 7, characterized in that: The third pressure detection unit comprises a third pressure transmitter (202) arranged on the branch pipeline (2).

9. The detection device for a flow controller according to claim 6, characterized in that: Each of the branch pipes (2) comprises a first pipe body and a second pipe body which are connected; The first tube body is connected to the main pipe (1), and the second tube body is a hose and is used to be connected to the flow controller (3).

10. A flow controller detection system, characterized in that: A detection device for a flow controller comprising any one of claims 1 to 8, and a control module; The control module is electrically connected to the first switch unit, the second switch unit, the pressure regulating unit and the flow controller (3).

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