Calibrating device for filter integrity tester

Abstract

A filter integrity tester calibration device comprises a gas supply channel, a test channel and a control module. The air supply channel comprises an air pump, a first stop valve and a calibration air outlet which are connected in sequence, the calibration air outlet is used for being connected with an air inlet of the detected filter integrity tester, and the first stop valve is used for controlling opening and closing of the calibration air outlet; the test channel comprises a calibration air inlet, a pressure gauge, a second stop valve, a buffer tank, a flow regulating valve, a flow meter and a calibration exhaust port which are connected in sequence, and the calibration air inlet is used for being connected with an air outlet of the detected filter integrity tester; the pressure meter and the flow meter are used for transmitting real-time acquired data to the control module; the flow adjusting valve is an electric control adjusting valve, and the control module compares real-time flow data collected by the flow meter with a preset target flow value so as to adjust the opening degree of the flow adjusting valve. The control module is adopted to control the flow regulating valve, and the accuracy and stability in the flow control process can be greatly improved.

Description

Technical Field

[0001] The present invention relates to a calibration device, in particular to a calibration device for a filter integrity tester. Background Art

[0002] A filter integrity tester (hereinafter referred to as the "tester") is a specialized instrument used to test the integrity of filter materials and filtration systems, verifying filter performance. It can perform bubble point, diffusion flow (forward flow), water immersion, and pressure-maintaining tests to verify the effectiveness of filter materials or systems. Parameters may vary depending on the manufacturer.

[0003] The filter integrity tester calibration device (hereafter referred to as the calibration device) is a universal calibration instrument that supports calibrating testers from different manufacturers. It is primarily used to verify (calibrate) the pressure and flow performance of these testers during the verification process, such as accuracy, repeatability, precision error, and stability.

[0004] In the metrology industry, filter integrity tester calibration methods are generally based on the "JJF 2142-2024 Filter Integrity Tester Calibration Specification" (hereinafter referred to as the "Specification"). However, the manufacturing methods and implementation principles vary from manufacturer to manufacturer. Generally speaking, due to the current lack of dedicated tester calibration equipment on the market, manufacturers generally use separate calibration instruments for tester verification, which are manually connected, assembled, and controlled during the calibration process. For example, the tester is connected in series with a standard pressure gauge, a standard flow meter, a control valve, a pipeline, and a gas source. The control valves on the pipelines are manually controlled to control the gas pressure or flow within the pipeline. The readings of each standard gauge are compared with those of the tester, and the comparison results are used to evaluate the tester's calibration capabilities. For example, the "Filter Integrity Tester Calibration Device" disclosed in CN216815992U employs manual adjustment.

[0005] While this verification method is simple and easy to implement, it presents numerous challenges, particularly during flow verification. According to the specification, the tester begins measuring the gas flow rate (e.g., 5 mL / min) in the control line at a certain pressure (e.g., 280 kPa). Once the pressure stabilizes at 280 kPa, the control valve is adjusted to maintain a stable flow rate of 5 mL / min. However, over time (e.g., 5 or 10 minutes), the pressure in the line decreases as some gas is expelled, causing the flow rate to decrease. This necessitates manual adjustment of the control valve to maintain a stable flow rate of 5 mL / min. However, manual intervention increases flow rate uncertainty. First, even the slightest movement of the valve can significantly alter the flow rate. Under-adjusting the valve will result in under-flow, while over-adjusting will result in over-flow. Furthermore, this adjustment range is difficult to control. This unstable flow rate causes fluctuations in the data collected by the standard flowmeter, which serves as the standard instrument. Second, because the tester measures the average flow rate over a period of time, the tester is also in the process of manually adjusting the flow rate. Although the flow through the standard flow meter can be controlled to maintain around 5 mL / min by manually adjusting the valve, it is not a stable value after all. The uncertainty of the value of the standard flow meter increases, causing errors in the final calibration results. Summary of the Invention

[0006] In order to solve at least one of the above technical problems, the present invention provides a filter integrity tester calibration device, including an air supply passage, a test passage, and a control module;

[0007] The air supply passage comprises an air pump, a first stop valve and a calibration air outlet connected in sequence, the calibration air outlet being used to connect to the air inlet of the filter integrity tester being tested, and the first stop valve being used to control the opening and closing of the calibration air outlet;

[0008] The test path includes a calibration air inlet, a pressure gauge, a second shut-off valve, a buffer tank, a flow regulating valve, a flow meter, and a calibration exhaust port connected in sequence, wherein the calibration air inlet is used to be connected to the air outlet of the filter integrity tester under inspection;

[0009] The pressure gauge and the flow meter are used to transmit real-time collected data to the control module; the flow regulating valve is an electrically controlled regulating valve, and the control module compares the real-time flow data collected by the flow meter with a preset target flow value to adjust the opening of the flow regulating valve.

[0010] The calibration device of the present invention adopts a control module to control the flow regulating valve during the flow calibration process, replacing manual control, which can greatly improve the accuracy and stability of the flow control process and reduce the error caused by manual intervention.

[0011] In some embodiments, both the first shut-off valve and the second shut-off valve are electrically controlled shut-off valves and are controlled by the control module.

[0012] In some embodiments, the filter integrity tester calibration device further includes a third shut-off valve and a drain outlet connected to the air pump, wherein the drain outlet is used to discharge the accumulated water in the air pump, and the third shut-off valve is used to control the opening and closing of the drain outlet.

[0013] In some embodiments, the response time of the flow control valve is 100ms±10ms, the execution time is 1s-2s, the flow regulation coefficient is 0.024±0.02, the caliber is 3mm, the pressure range is not less than 2.5MPa, the minimum step angle of the built-in motor is 1.6°, and the reduction ratio of the built-in reducer is 1:20.

[0014] In some embodiments, the filter integrity tester calibration device further comprises:

[0015] an input device for receiving operator instructions and transmitting them to the control module; and

[0016] An output device is connected to the control module and is used to output the collected data of the pressure meter and the flow meter.

[0017] In some embodiments, the input device and the output device are integrated into a touch screen display, and the output device further includes a USB interface.

[0018] In some embodiments, the filter integrity tester calibration device further comprises a bottom tray and a housing covering the bottom tray, wherein the test passage and the air supply passage are respectively disposed on a left side and a right side of the bottom tray;

[0019] A fixing frame is further provided on the left side of the bottom tray, the buffer tank is arranged below the fixing frame, and the pressure gauge, the second shut-off valve, the flow regulating valve, the flow meter and the control module are respectively arranged above the fixing frame.

[0020] In some embodiments, the fixing bracket includes a first fixing bracket located on the front side of the bottom tray and a second fixing bracket located on the rear side of the bottom tray, the pressure gauge, the second shut-off valve and the control module are arranged on the first fixing bracket, and the flow regulating valve and the flow meter are arranged on the second fixing bracket.

[0021] In some embodiments, the calibration air inlet, the calibration air outlet, and the calibration air exhaust are disposed on a front side panel of the housing.

[0022] In some embodiments, the filter integrity tester calibration device further comprises:

[0023] an emergency stop switch and a reset switch, each electrically connected to the control module;

[0024] a heat dissipation exhaust port, which is provided on the housing; and

[0025] A power interface is provided on the housing. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 This is a system principle diagram of the calibration device of the present invention, wherein the box shows the structure inside the housing of the calibration device;

[0027] Figure 2 is a perspective view of the calibration device of the present invention;

[0028] Figure 3 It is a right side view of the calibration device of the present invention;

[0029] Figure 4 It is a schematic diagram of the connection between the calibration device of the present invention and the tester under test;

[0030] Figure 5 A perspective view of the structure inside the housing of the calibration device of the present invention;

[0031] Figure 6 This is a top view of the structure inside the shell of the calibration device of the present invention.

[0032] Reference numerals:

[0033] Tester A1; calibration device B1; calibration air inlet 11; calibration air outlet 12; calibration exhaust port 13; drain port 14; air pump Q1; first stop valve K1; third stop valve K3; pressure gauge U1; second stop valve K2; buffer tank H1; flow regulating valve T1; flow meter M1; control module 20; touch screen display 31; USB interface 32; emergency stop switch 33; reset switch 34; heat dissipation exhaust port 41; power interface 42; handle 50; housing 60; front side panel 61; rear side panel 62; left side panel 63; right side panel 64; bottom tray 71; first fixing bracket 72; second fixing bracket 73. DETAILED DESCRIPTION

[0034] The present invention will be further described in detail below with reference to the accompanying drawings. It is apparent that the embodiments described are only some, not all, of the present invention. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without inventive effort are intended to fall within the scope of protection of the present invention.

[0035] It should be noted that the terms "first," "second," etc. are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of the technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of such features. In the description of the present invention, "plurality" means at least two, for example, two, three, etc., unless otherwise specifically defined.

[0036] In the present invention, unless otherwise clearly specified and limited, the terms "install", "connect", "fix" and the like should be understood in a broad sense. For example, "install" and "connect" can be fixed connections or movable connections, and "fix" can be non-detachable fixed connections or removable fixed connections. Among them, "non-detachable fixed connection" can be that the two are separated and then installed, or the two are directly integrated; it can be a mechanical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances.

[0037] In the present invention, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediary. Furthermore, when a first feature is "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0038] In the above description, the reference terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and features of different embodiments or examples without contradiction.

[0039] The present invention provides a filter integrity tester A1 calibration device B1 (hereinafter referred to as: calibration device B1), which is used to calibrate a filter integrity tester A1 (hereinafter referred to as: tester A1).

[0040] The calibration device B1 includes a bottom tray 71 , a shell 60 covering the bottom tray 71 , an air supply passage, a test passage and a control module 20 , wherein the air supply passage, the test passage and the control module 20 are arranged on the bottom tray 71 and located in the shell 60 .

[0041] See Figure 1 The air supply path includes an air pump Q1, a first shut-off valve K1, and a calibration air outlet 12, which are connected in sequence. The calibration air outlet 12 is used to connect to the air inlet of the filter integrity tester A1 under inspection. The first shut-off valve K1 is used to control the opening and closing of the calibration air outlet 12. In this embodiment, the air pump Q1 is connected to an air source. The air pump Q1 has only two switch gears and is turned on when the power switch is turned on. The first shut-off valve K1 is specifically an electrically controlled shut-off valve and is controlled by the control module 20. It has only two switch gears and is used to connect the pipeline from the tester A1 to the air pump Q1. In other embodiments, the first shut-off valve K1 can also be a manual shut-off valve.

[0042] In this embodiment, the end of the air pump Q1 not connected to the first shut-off valve K1 is also connected to a third shut-off valve K3 and a drain port 14. Drain port 14 is used to drain accumulated water from the air pump Q1, and the third shut-off valve K3 is used to control the opening and closing of drain port 14. In this embodiment, the third shut-off valve K3 is a manual shut-off valve; in other embodiments, an electrically controlled shut-off valve may also be used. In this embodiment, the third shut-off valve K3 and drain port 14 are located outside the housing 60 to facilitate manual drainage.

[0043] The test path includes a calibration air inlet 11, a pressure gauge U1, a second shut-off valve K2, a buffer tank H1, a flow control valve T1, a flow meter M1, and a calibration exhaust port 13, which are connected in sequence. The calibration air inlet 11 is used to connect to the air outlet of the filter integrity tester A1 under test, and the calibration exhaust port 13 is used to exhaust air outward during flow calibration. The second shut-off valve K2 is specifically an electrically controlled shut-off valve and is controlled by the control module 20. It has only two switch gears and is used to close the pipeline during pressure calibration. In other embodiments, the second shut-off valve K2 can also be a manual shut-off valve. The pressure gauge U1 is used to measure the gas pressure in the pipeline, and the flow meter M1 is used to measure the gas flow in the pipeline. Both the pressure gauge U1 and the flow meter M1 have communication functions for transmitting real-time collected data to the control module 20. The flow control valve T1 is an electrically controlled regulating valve. The control module 20 compares the real-time flow data collected by the flow meter M1 with the preset target flow value, thereby adjusting the opening of the flow control valve T1 to automatically adjust the gas flow in the pipeline. Specifically, the flow regulating valve T1 has a built-in stepper motor, and the valve opening is controlled by the stepper motor. The stepper motor is controlled by a stepper motor driver. The control module 20 communicates with the stepper motor driver to send control commands to control the rotation direction and stroke of the stepper motor, thereby controlling the opening of the flow regulating valve T1.

[0044] When the buffer tank H1 is used for flow calibration, it maintains the stability of the pressure in the pipeline. For flow calibration, the larger the volume of the buffer tank H1, the better. The larger the volume, the more total gas that can be stored in advance. Because the diameter of the pipeline remains constant, when the flow regulating valve T1 opens a certain switch size, the gas in the buffer tank H1 will be discharged. Because the volume of the buffer tank H1 is relatively large, the gas discharged within a period of time is limited after all, and the proportion is smaller than the total amount of gas in the entire system, which is more beneficial to maintaining the constant system pressure. However, if the volume of the buffer tank H1 is too large, it will take up space, causing the volume of the entire calibration device B1 to increase. At the same time, it will also cause the initial inflation time to become longer. The tester A1 and the air pump Q1 will remain in an inflation load state for a long time, causing the system temperature to rise, which will affect the test. Therefore, the present invention preferably uses a buffer tank H1 with a volume of 2L-3L.

[0045] The control module 20 of this embodiment is specifically a PLC controller with a built-in PID control program. When the desired flow rate is input through the control interface, a control instruction is sent to the control module, which then controls the opening and closing of the flow control valve T1 based on the feedback signal from the flow meter to achieve the purpose of controlling the flow rate. This embodiment uses a program to control the flow control valve T1, the first stop valve K1, and the second stop valve K2. The entire execution process is performed without human intervention, resulting in a shorter response time, faster execution speed, and higher control accuracy of the control system. The control module 20 can specifically adopt an RTOS operating system.

[0046] There are two main difficulties in the application of PID program control: First, the selection of components. The selected flow control valve T1 should have fast execution efficiency, accurate positioning accuracy and short response time, and the response time of the flow meter M1 should also be short. If these basic configurations are not good, it will directly affect the calibration accuracy of the entire calibration device B1. Therefore, the preferred response time of the flow control valve T1 of the present invention is about 100ms, for example, it can be 100ms±10ms, and the execution time is usually 1s-2s. Second, the determination of the adjustment coefficient of the flow control valve T1. In the range of different flow sizes, the flow adjustment coefficient used is different. Under normal circumstances, if the flow adjustment coefficient is too large, the gas flow fluctuation error will become larger, and if the flow adjustment coefficient is too small, the execution time of the flow control valve will become longer. In the present invention, the preferred flow adjustment coefficient of the flow control valve T1 is 0.024±0.02, and it is built into the PID control program, without the need for on-site test personnel to input. Specifically, the flow regulating valve T1 of this embodiment preferably adopts a precision electronically controlled micro gas metering valve with a diameter of 3mm, a flow coefficient of 0.024, and a pressure range of not less than 2.5MPa. The built-in motor in the flow regulating valve T1 (minimum step angle 1.6°) is converted by a reducer (speed ratio 1:20), and the minimum step angle can reach 1.6°*1 / 20.

[0047] Furthermore, the relevant configurations of this embodiment are preferably as follows:

[0048] 1. Dimensions of calibration device B1: length * width * height = 600 * 500 * 400 mm;

[0049] 2. Air pump Q1 specifications:

[0050]

[0051] 3. Specifications of pressure gauge U1:

[0052]

[0053]

[0054] 4. Flow meter M1 specifications:

[0055]

[0056] 5. Gas tank H1 specifications:

[0057]

[0058] 6. Finished product design parameters:

[0059] Design pressure: 0-0.8MPa, accuracy 0.05 level;

[0060] Gas flow measurement range: 0 ~ 50mL / min, accuracy 1.0% SP; Pipe interface diameter: connect to 6mm outer diameter hose;

[0061] Outer box material: stainless steel, surface paint;

[0062] Working environment: -50~60℃;

[0063] Working voltage: 220V / 50HZ.

[0064] Further, see Figure 2 The calibration device B1 also includes an input device for receiving operator instructions and transmitting them to the control module 20. The calibration device B1 also includes an output device, which is connected to the control module 20 and is used to output data collected by the pressure gauge U1 and the flow meter M1. In this embodiment, the input device and the output device are integrated into a touch screen display 31. In addition, the output device also includes a USB port 32 for outputting data collected during the calibration process. In this embodiment, the touch screen display 31 and the USB port 32 are disposed on the side panel of the housing 60.

[0065] Further, see Figure 2 and Figure 3 The calibration device B1 also includes: an emergency stop switch 33 and a reset switch 34, which are electrically connected to the control module 20 respectively and are arranged on the side panel of the shell 60; a heat dissipation exhaust port 41, which is arranged on the shell 60; and a power supply interface 42, which is arranged on the shell 60.

[0066] The emergency stop switch 33 is mainly used to control the power control status of each component in the calibration device B1 (excluding the control module 20). After the emergency stop switch 33 is pressed, the control module 20 will also store the emergency stop record. After the emergency stop switch 33 is pressed: First, since the first stop valve K1 and the second stop valve K2 are normally closed valves, after the emergency stop switch 33 is pressed, the valve power is cut off and the valve is automatically closed; second, the flow control valve T1 maintains the current state; third, the power supply of the air pump Q1 is disconnected; fourth, other components maintain the current state. The reset switch 34 is a switch used to confirm whether to continue operation. After the reset switch 34 is pressed, it indicates to continue operation: according to the state set before the emergency stop and the operating conditions, the above-mentioned components continue to operate, such as the air pump Q1, the first stop valve K1 and the second stop valve K2, and the flow control valve T1 are normally powered on and accept the control of the control module 20.

[0067] In this embodiment, refer to Figure 2The calibration air inlet 11, calibration air outlet 12, calibration exhaust port 13, third shut-off valve K3, and drain port 14 are all located on the front side panel 61 of the housing 60 to facilitate connection or use with the tester A1. The touch screen 31, USB port 32, emergency stop switch 33, and reset switch 34 are all located on the left side panel 63 of the housing 60 to facilitate interaction with the operator. The heat dissipation exhaust port 41 and power port 42 are located on the right side panel 64 of the housing 60. The front side panel 61 and rear side panel 62 of the housing 60 are also respectively provided with embedded handles 50.

[0068] See Figure 5 and Figure 6 , inside the shell 60, the test passage and the air supply passage are respectively arranged on the left and right sides of the bottom tray 71. A fixing bracket is also provided on the left side of the bottom tray 71, and the buffer tank H1 is arranged below the fixing bracket, and the pressure gauge U1, the second stop valve K2, the flow regulating valve T1, the flow meter M1 and the control module 20 are respectively arranged above the fixing bracket. Specifically, the fixing bracket includes a first fixing bracket 72 located on the front side of the bottom tray 71 and a second fixing bracket 73 located on the rear side of the bottom tray 71. The pressure gauge U1, the second stop valve K2 and the control module 20 are arranged on the first fixing bracket 72, and the flow regulating valve T1 and the flow meter M1 are arranged on the second fixing bracket 73. This calibration device B1 is a desktop instrument that can be directly placed on the test bench for use. The volume should not be too large. This placement method is very compact and has high space utilization. It is also convenient for connecting the various components through hoses. The components that need communication or control are arranged in a centralized manner, which is convenient for optimizing the control circuit and is also conducive to the miniaturization of the calibration device B1.

[0069] The calibration device B1 of the present invention has the following functions:

[0070] 1. Pressure measurement: During calibration, the real-time pressure data collected by the pressure gauge U1 is directly read by the control module 20;

[0071] 2. Flow measurement: During calibration, the real-time flow data collected by the flow meter M1 is directly read through the control module 20;

[0072] 3. Automatic valve control: After selecting the required calibration program through the touch screen 31, the state of the valve will automatically adjust according to the command sent by the control module 20;

[0073] 4. Automatic pressure calibration function: By selecting the pressure calibration function through the touch screen 31, the pressure calibration process of the tester A1 can be automatically completed through the PID program control of the control module 20, and the collected data can be summarized or all the collected data can be output to an Excel table;

[0074] 5. Automatic flow calibration function: Select the flow calibration function through the touch screen 31, set the required flow size, and control the PID program of the control module 20 to automatically complete the flow calibration process of the tester A1. The collected data can be summarized or all the collected data can be output to an Excel table.

[0075] The operation process of the calibration device B1 of the present invention is as follows:

[0076] 1. Installation of the Tester A1

[0077] S1: See Figure 4 , use a hose to connect the air inlet of the tester A1 to the calibration air outlet 12 of the calibration device B1; use a hose to connect the air outlet of the tester A1 to the calibration air inlet 11 in the calibration device B1;

[0078] S2: Turn on the power of the calibration device B1, turn it on, and the air pump Q1 starts working;

[0079] S3: Click "Air Pump Q1 On" on the control interface of the touch screen 31 of the calibration device B1, and the first shut-off valve K1 opens;

[0080] S4: Turn on the power of the tester A1; now the tester A1 has been connected to the calibration device B1.

[0081] 2. Pressure Calibration

[0082] The pressure calibration process for Tester A1 is achieved through its inherent pressure control capabilities. Tester A1 controls and stabilizes the gas pressure within the pipeline over a period of time. The data collected by Tester A1 during this process is then compared with the data collected by calibration device B1 to verify (calibrate) the pressure of Tester A1.

[0083] The specific operation process is as follows:

[0084] S1: Set the pressure to be controlled on the tester A1 and confirm the operation;

[0085] S2: Select pressure calibration on the control interface of the touch screen 31 of the calibration device B1 and start calibration. The second shut-off valve K2 is then closed;

[0086] S3: The system automatically runs, and the air pump Q1 inflates the pipes of the tester A1 and the calibration device B1 before the second shut-off valve K2 until the set pressure is reached and maintains the pressure until the calibration process is completed;

[0087] S4: The operator chooses to record the calibration data or output the data collected by the calibration device B1.

[0088] 3. Flow calibration

[0089] The flow calibration process for tester A1 utilizes the flow control capabilities of calibration device B1. By controlling and maintaining a stable gas flow through the pipeline over a period of time, and comparing the data collected by tester A1 with the data collected by calibration device B1 during this process, the flow rate of tester A1 is verified (calibrated).

[0090] The specific operation process is as follows:

[0091] S1: Set the flow rate to be controlled on the tester A1 and confirm the operation;

[0092] S2: Select flow calibration on the touch screen 31 of the calibration device B1, set the required flow rate, and start calibration. The second shut-off valve K2 opens.

[0093] S3: The system automatically operates, with air pump Q1 ventilating all test pipes of the tester A1 and calibration device B1, and exhausting the air into the environment through the calibration exhaust port 13. Based on the feedback signal from flow meter M1, the PID program in control module 20 controls the flow control valve T1 to adjust the flow rate. If the collected flow rate exceeds the set value, flow control valve T1 is adjusted downward. If the collected flow rate is lower than the set value, flow control valve T1 is adjusted upward until the collected flow rate reaches the set target flow rate and remains stable until the calibration process is completed.

[0094] S4: The operator chooses to record the calibration data or output the data collected by the calibration device B1.

[0095] The calibration device of the present invention adopts a control module to control the flow regulating valve during the flow calibration process, replacing manual control, which can greatly improve the accuracy and stability of the flow control process and reduce the error caused by manual intervention; compared with the original bulk calibration solution, the present invention has better popularity and versatility because the device has been integrated; in terms of reading or data processing, the present invention can realize the collection of data throughout the process, and the state fluctuations during the calibration process will be recorded, which is convenient for a more comprehensive evaluation of the performance of the tester under test; due to the reduction of manual input, the labor intensity is reduced.

[0096] The above are only some embodiments of the present invention. Those skilled in the art will appreciate that, without departing from the inventive concept of the present invention, they may make various modifications and improvements, or freely combine the above technical solutions, including freely combining the technical features of the different embodiments described above, all of which fall within the scope of protection of the present invention.

Claims

1. A filter integrity tester calibration device, characterized in that: Including air supply passage, test passage and control module; The air supply passage comprises an air pump, a first stop valve and a calibration air outlet connected in sequence, the calibration air outlet being used to connect to the air inlet of the filter integrity tester being tested, and the first stop valve being used to control the opening and closing of the calibration air outlet; The test path includes a calibration air inlet, a pressure gauge, a second shut-off valve, a buffer tank, a flow regulating valve, a flow meter, and a calibration exhaust port connected in sequence, wherein the calibration air inlet is used to be connected to the air outlet of the filter integrity tester under inspection; The pressure gauge and the flow meter are used to transmit real-time collected data to the control module; the flow regulating valve is an electrically controlled regulating valve, and the control module compares the real-time flow data collected by the flow meter with a preset target flow value to adjust the opening of the flow regulating valve.

2. The filter integrity tester calibration device according to claim 1, characterized in that The first stop valve and the second stop valve are both electrically controlled stop valves and are controlled by the control module.

3. The filter integrity tester calibration device according to claim 1, characterized in that It also includes a third stop valve and a drain outlet connected to the air pump. The drain outlet is used to discharge the accumulated water in the air pump to the outside, and the third stop valve is used to control the opening and closing of the drain outlet.

4. The filter integrity tester calibration device according to claim 1, characterized in that The response time of the flow control valve is 100ms±10ms, the execution time is 1s-2s, the flow adjustment coefficient is 0.024±0.02, the diameter is 3mm, the pressure range is not less than 2.5MPa, the minimum step angle of the built-in motor is 1.6°, and the reduction ratio of the built-in reducer is 1:

20.

5. The filter integrity tester calibration device according to claim 1, characterized in that: Also includes: an input device for receiving operator instructions and transmitting them to the control module; as well as An output device is connected to the control module and is used to output the collected data of the pressure meter and the flow meter.

6. The filter integrity tester calibration device according to claim 5, characterized in that: The input device and the output device are integrated into a touch screen display, and the output device also includes a USB interface.

7. The filter integrity tester calibration device according to any one of claims 1 to 6, characterized in that: It also includes a bottom tray and a shell covering the bottom tray, wherein the test passage and the air supply passage are respectively arranged on the left and right sides of the bottom tray; A fixing frame is further provided on the left side of the bottom tray, the buffer tank is arranged below the fixing frame, and the pressure gauge, the second shut-off valve, the flow regulating valve, the flow meter and the control module are respectively arranged above the fixing frame.

8. The filter integrity tester calibration device according to claim 7, characterized in that: The fixing bracket includes a first fixing bracket located on the front side of the bottom tray and a second fixing bracket located on the rear side of the bottom tray. The pressure gauge, the second shut-off valve and the control module are arranged on the first fixing bracket, and the flow regulating valve and the flow meter are arranged on the second fixing bracket.

9. The filter integrity tester calibration device according to claim 7, characterized in that: The calibration air inlet, the calibration air outlet, and the calibration air exhaust port are arranged on the front side panel of the housing.

10. The filter integrity tester calibration device according to any one of claims 1 to 6, characterized in that: Also includes: an emergency stop switch and a reset switch, each electrically connected to the control module; a heat dissipation exhaust port, which is provided on the housing; as well as A power interface is provided on the housing.

Images