Air valve sealing performance detection device

Abstract

The utility model provides an air valve sealing performance detection device, which comprises a vacuum pump, a connecting pipeline, a check valve, a test pipeline and a vacuum gauge, and is characterized in that the vacuum pump is in sealing connection with the check valve through the connecting pipeline, the check valve is in sealing connection with the test pipeline, and the test pipeline is in sealing connection with an air valve to be detected; and the vacuum gauge is arranged on the test pipeline. By arranging the check valve between the test pipeline and the vacuum pump, in the test process, gas can only flow to the vacuum pump from the test pipeline in a one-way mode, even if the vacuum pump stops working, external air cannot enter the test pipeline through reverse flow, and therefore the stability of a negative pressure environment formed in the test pipeline in the test process is guaranteed; and the test accuracy and reliability are improved. And all the parts are in sealed connection, so that extra gas leakage is avoided in the testing process, the testing accuracy and reliability are further improved, and the air valve testing device is particularly suitable for air valve detection with high sealing performance.

Description

Technical Field

[0001] This utility model relates to the field of air valve testing technology, and in particular to an air valve sealing performance testing device. Background Technology

[0002] Currently, traditional testing methods for the sealing performance of air valves mainly include positive pressure testing and negative pressure testing.

[0003] The positive pressure test method uses a fan to inject air at a certain pressure into a valve through a pipeline. The leakage rate is then calculated by measuring key parameters such as the airflow rate and the maintained pressure. However, when the valve requires high sealing performance (i.e., extremely low leakage), the fan cannot stably and accurately provide the necessary small positive pressure, leading to deviations in the measured pressure and flow data and affecting the accuracy of the test.

[0004] The negative pressure test method uses a fan and piping to create a negative pressure environment on one side of the damper. The leakage rate is calculated by observing the flow rate of outside air leaking into the system through the damper and the maintenance of the negative pressure. While the negative pressure test method offers slightly higher accuracy than the positive pressure test method, it is still more precise.

[0005] However, current negative pressure testing devices have significant design flaws, lacking a check valve. This leads to gas backflow during testing, disrupting the established negative pressure environment and affecting the accuracy and reliability of the test. Furthermore, inadequate sealing at the connections between pipelines, fans, and valves results in additional gas leaks, further compromising the accuracy and reliability of the test.

[0006] In view of the above, this utility model is hereby proposed. Utility Model Content

[0007] The purpose of this invention is to provide a valve sealing performance testing device to address the technical problem in existing negative pressure testing devices that suffer from structural design defects, such as the lack of a check valve, which leads to gas backflow during testing and affects the accuracy and reliability of the test. The preferred technical solutions provided by this invention offer numerous technical advantages, which are detailed below.

[0008] To achieve the above objectives, the present invention provides the following technical solution:

[0009] This utility model provides a valve sealing performance testing device, comprising a vacuum pump, a connecting pipe, a check valve, a test pipe, and a vacuum gauge. The vacuum pump is sealed to the outlet end of the check valve via the connecting pipe, the inlet end of the check valve is sealed to the outlet end of the test pipe, and the inlet end of the test pipe is sealed to the valve to be tested, thereby forming a closed test space within the test pipe. The vacuum gauge is mounted on the test pipe for measuring the vacuum level within the test pipe.

[0010] Preferably, the vacuum pump is connected to the connecting pipe, the connecting pipe to the check valve, the check valve to the test pipe, and the test pipe to the air valve to be tested via a flange sealing connection assembly.

[0011] Preferably, the flange sealing connection assembly includes a first flange, a second flange, and a sealing ring. The first flange and the second flange are detachably connected, and their opposite sides are respectively provided with an annular sealing groove and a sealing protrusion. The sealing ring is disposed in the sealing groove, and the sealing protrusion engages with the sealing groove.

[0012] Preferably, the cross-section of the sealing protrusion is trapezoidal, and the diameter gradually decreases along the direction close to the sealing groove, and the shape of the sealing groove is adapted to the sealing protrusion.

[0013] Preferably, a boss is provided on the bottom surface of the sealing groove, and the number of bosses is multiple, arranged sequentially along the radial direction of the sealing groove.

[0014] Preferably, the cross-section of the boss is semi-circular.

[0015] Preferably, the system further includes a calculation module and a control system. The calculation module is used to calculate the volume of air entering the test space within the preset measurement time interval, i.e., the leakage, based on the initial and final vacuum levels measured by the vacuum gauge, the volume of the test space, and the preset measurement time interval. It also calculates the leakage rate of the valve to be tested based on the theoretical flow meter of the valve. The calculation module, the vacuum pump, and the vacuum gauge are electrically connected to the control system.

[0016] Preferably, the vacuum pump includes a diffusion vacuum pump.

[0017] The preferred technical solution of this utility model can also produce at least the following technical effects:

[0018] This invention effectively avoids the structural design defects of existing negative pressure testing devices, such as the lack of a check valve, which leads to gas backflow during testing, affecting the accuracy and reliability of the test. This invention provides a valve sealing performance testing device, including a vacuum pump, connecting pipe, check valve, test pipe, and vacuum gauge. The vacuum pump is sealed to the outlet of the check valve via the connecting pipe, the inlet of the check valve is sealed to the outlet of the test pipe, and the inlet of the test pipe is sealed to the valve to be tested, thus forming a closed test space within the test pipe. The vacuum gauge is installed on the test pipe to measure the vacuum level within it. By installing a check valve between the test pipe and the vacuum pump, this invention ensures that gas can only flow unidirectionally from the test pipe to the vacuum pump during testing. Even if the vacuum pump stops working, external air cannot enter the test pipe through backflow, thus guaranteeing the stability of the negative pressure environment formed inside the test pipe during testing and improving the accuracy and reliability of the test. Furthermore, the sealed connection between each component ensures that there will be no additional gas leakage during the test, further improving the accuracy and reliability of the test, and making it especially suitable for testing air valves with high sealing requirements. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the structural connection of a valve sealing performance testing device provided by this utility model;

[0021] Figure 2 This is a schematic diagram of the flange sealing connection assembly of a valve sealing performance testing device provided by this utility model;

[0022] Figure 3 yes Figure 2 A magnified view of part A.

[0023] In the picture:

[0024] 1. Vacuum pump; 2. Connecting pipe; 3. Check valve; 4. Test pipe; 5. Vacuum gauge; 6. Air valve to be tested; 7. First flange; 71. Sealing groove; 711. Boss; 72. First connecting hole; 8. Second flange; 81. Sealing protrusion; 82. Second connecting hole; 9. Sealing ring. Detailed Implementation

[0025] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions of this utility model will be described in detail below. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. Based on the embodiments of this utility model, all other implementation methods obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0026] like Figures 1-3 As shown, this utility model provides a device for testing the sealing performance of a wind valve, including a vacuum pump 1, a connecting pipe 2, a check valve 3, a test pipe 4, and a vacuum gauge 5. The vacuum pump 1 is sealed to the outlet end of the check valve 3 through the connecting pipe 2. The inlet end of the check valve 3 is sealed to the outlet end of the test pipe 4. The inlet end of the test pipe 4 is sealed to the wind valve 6 to be tested, so that a closed test space is formed inside the test pipe 4. The vacuum gauge 5 is installed on the test pipe 4 and is used to measure the vacuum degree inside the test pipe 4.

[0027] By installing a check valve 3 between the test pipe 4 and the vacuum pump 1, gas can only flow unidirectionally from the test pipe 4 to the vacuum pump 1 during the test. Even if the vacuum pump 1 stops working, external air cannot enter the test pipe 4 through backflow, thus ensuring the stability of the negative pressure environment formed inside the test pipe 4 during the test and improving the accuracy and reliability of the test. Furthermore, the sealed connections between all components prevent additional gas leakage during the test, further improving the accuracy and reliability of the test, making it particularly suitable for testing highly leak-proof air valves.

[0028] Test pipe 4 is used to connect the air valve 6 to be tested and the check valve 3 to form a closed test space.

[0029] Connecting pipe 2 is used to connect vacuum pump 1 and check valve 3 so that gas can flow smoothly in one direction.

[0030] Vacuum pump 1 serves as a power source to extract air from test pipe 4, creating a high vacuum environment in the test space, i.e., the pressure within the test space is 10. -1 Pa to 10 -6 Between Pa.

[0031] Vacuum gauge 5 is installed on test pipe 4 to monitor the vacuum level in the enclosed space in real time. By observing the changes in vacuum level, the sealing performance of the air valve can be judged.

[0032] As an optional implementation, the vacuum pump 1 is connected to the connecting pipe 2, the connecting pipe 2 to the check valve 3, the check valve 3 to the test pipe 4, and the test pipe 4 to the air valve 6 to be tested via a flange sealing connection assembly.

[0033] This setup improves the sealing of component connections, prevents gas leakage, and further ensures the accuracy and reliability of the test.

[0034] As an optional implementation, such as Figure 2 , Figure 3 As shown, the flange sealing connection assembly includes a first flange 7, a second flange 8, and a sealing ring 9. The first flange 7 and the second flange 8 are detachably connected, and an annular sealing groove 71 and a sealing protrusion 81 are respectively provided on opposite sides of the two. The sealing ring 9 is disposed in the sealing groove 71, and the sealing protrusion 81 engages with the sealing groove 71.

[0035] Furthermore, the outer edge of the first flange 7 is provided with a plurality of first connecting holes 72, and the outer edge of the second flange 8 is provided with a plurality of second connecting holes 82. The first connecting holes 72 and the second connecting holes 82 are provided in a one-to-one correspondence and are connected by bolts to securely connect the first flange 7 and the second flange 8.

[0036] When the first flange 7 and the second flange 8 are fastened together, the sealing protrusion 81 is inserted into the sealing groove 71, which compresses the sealing ring 9 to form an effective sealing structure.

[0037] Specifically, the vacuum pump 1 is equipped with a first flange 7 (or a second flange 8), and the first end of the connecting pipe 2 is equipped with a second flange 8 (or a first flange 7). The two are fastened together by bolts to improve the sealing between the vacuum pump 1 and the connecting pipe 2.

[0038] Similarly, the second end of the connecting pipe 2 is equipped with a first flange 7 (or a second flange 8), and the outlet end of the check valve 3 is equipped with a second flange 8 (or a first flange 7). The two are fastened together by bolts to improve the sealing between the connecting pipe 2 and the check valve 3.

[0039] The check valve 3 is equipped with a first flange 7 (or a second flange 8) at its inlet end, and the test pipe 4 is equipped with a second flange 8 (or a first flange 7) at its outlet end. The two are fastened together with bolts to improve the sealing between the check valve 3 and the test pipe 4.

[0040] The air inlet end of the test pipe 4 is equipped with a first flange 7 (or a second flange 8), and the air valve 6 to be tested is equipped with a second flange 8 (or a first flange 7). The two are fastened together with bolts to improve the sealing between the test pipe 4 and the air valve 6 to be tested.

[0041] It should be noted that the positions of the first flange 7 and the second flange 8 are not fixed. For example, the vacuum pump 1 can also be equipped with a second flange 8, and the first end of the connecting pipe 2 can also be equipped with a first flange 7. As long as the fastening and sealing effects can be achieved, the positions of the two can be flexibly interchanged.

[0042] As an optional implementation, such as Figure 3 As shown, the cross-section of the sealing protrusion 81 is trapezoidal, and the diameter gradually decreases along the direction close to the sealing groove 71. The shape of the sealing groove 71 is adapted to the sealing protrusion 81.

[0043] With this configuration, when the first flange 7 and the second flange 8 are fastened together, the sealing protrusion 81 is inserted into the sealing groove 71, and the inclined edge and top edge of the sealing protrusion 81 contact the sealing ring 9 at different angles, so that pressure can be transmitted to the sealing ring 9 from multiple directions, which helps the sealing ring 9 to deform more evenly, thereby improving the sealing effect.

[0044] As an optional implementation, such as Figure 3 As shown, a boss 711 is provided on the bottom surface of the sealing groove 71. There are multiple bosses 711, which are arranged sequentially along the radial direction of the sealing groove 71.

[0045] As an alternative implementation, the cross-section of the boss 711 is semi-circular.

[0046] This design, compared to some angular shapes, uses a rounded surface for contact between the boss 711 and the sealing ring 9, reducing friction. This not only makes the installation of the sealing ring 9 smoother, but also reduces wear on the sealing ring 9 and the boss 711 due to friction during long-term use, extending their service life.

[0047] As an optional implementation, a calculation module and a control system are also included. The calculation module is used to calculate the volume of air entering the closed space within the preset measurement time interval, i.e. the leakage, based on the initial vacuum degree and final vacuum degree measured by the vacuum gauge 5, the volume of the test space and the preset measurement time interval, and to obtain the leakage rate of the air valve 6 to be tested based on the theoretical flow meter of the air valve 6 to be tested. The calculation module, vacuum pump 1 and vacuum gauge 5 are electrically connected to the control system.

[0048] It should be noted that the calculation module, vacuum pump 1, vacuum gauge 5, and control system adopt existing technology, and the specific circuit connection relationship between their components is also existing technology, which will not be elaborated here.

[0049] In addition to relying on the calculation module for automatic calculation, operators can also manually record the vacuum level value of vacuum gauge 5 and calculate the leakage rate data according to actual needs.

[0050] As an optional implementation, vacuum pump 1 includes diffusion vacuum pump 1.

[0051] The working principle of this utility model is as follows:

[0052] Step 1: Start vacuum pump 1 to extract air from test pipe 4 to create a high vacuum environment in the enclosed space. Vacuum gauge 5 monitors the vacuum level in the enclosed space in real time.

[0053] Step 2: Once the vacuum level reaches the predetermined vacuum level, immediately turn off vacuum pump 1 and record the vacuum level value of vacuum gauge 5 at this time as the initial vacuum level P0 (unit: Pascal).

[0054] Step 3: After turning off vacuum pump 1, start timing and continuously observe the changes in the reading of vacuum gauge 5;

[0055] Step 4: After the preset time interval t (unit: seconds) is reached, record the reading of vacuum gauge 5 again. This value is the final vacuum level P1 (unit: Pascal).

[0056] Step 5: According to the formula: Where: (P0 - P1) represents the change in vacuum (unit: Pascal), V is the volume of the enclosed space (unit: cubic meters), and t is the measurement time interval (unit: seconds). The volume of air entering the enclosed space during the measurement time interval, i.e., the leakage amount Q (unit: cubic meters per second), can be calculated using the above formula.

[0057] This invention relates to a valve sealing detection device that can detect minute leaks with high sensitivity. In applications where air leakage is extremely sensitive, such as cleanrooms and the protection of high-precision instruments and equipment, this device can be used for vacuum testing to detect minute leaks in valves that may cause slight environmental changes or affect the normal operation of instruments.

[0058] This invention relates to a valve sealing performance testing device that can simulate valve sealing performance testing under various actual operating conditions. For example, in vacuum distillation equipment, the sealing performance of the valve directly affects the system's vacuum level and product quality. By performing vacuum testing with this device, it is possible to accurately determine whether the valve meets the sealing requirements under specific operating conditions.

[0059] This utility model discloses a valve sealing performance testing device that enables quantitative analysis. In the valve manufacturing quality control process, this device performs vacuum testing to obtain accurate leakage rate data, determining whether the valve meets product standards, thus allowing for the screening and improvement of substandard products.

[0060] It is understood that the same or similar parts in the above embodiments can be referred to each other, and the contents not described in detail in some embodiments can be referred to the same or similar contents in other embodiments.

[0061] In the description of this utility model, it should be noted that, unless otherwise stated, "a plurality of" means two or more; the terms "upper," "lower," "left," "right," "inner," "outer," "front end," "rear end," "head," "tail," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," "third," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0062] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0063] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "a particular example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0064] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the protection scope of the claims.

Claims

1. A device for testing the sealing performance of a damper, characterized in that, The system includes a vacuum pump, connecting pipes, a check valve, a test pipe, and a vacuum gauge. The vacuum pump is sealed to the outlet of the check valve via the connecting pipe. The inlet of the check valve is sealed to the outlet of the test pipe. The inlet of the test pipe is sealed to the air valve to be tested, thus forming a closed test space within the test pipe. The vacuum gauge is mounted on the test pipe to measure the vacuum level of the test pipe.

2. The valve sealing performance testing device according to claim 1, characterized in that, The vacuum pump is connected to the connecting pipe, the connecting pipe to the check valve, the check valve to the test pipe, and the test pipe to the air valve to be tested via a flange sealing connection assembly.

3. The valve sealing performance testing device according to claim 2, characterized in that, The flange sealing connection assembly includes a first flange, a second flange, and a sealing ring. The first flange and the second flange are connected by bolts, and an annular sealing groove and a sealing protrusion are respectively provided on opposite sides of the two flanges. The sealing ring is disposed in the sealing groove, and the sealing protrusion engages with the sealing groove.

4. The valve sealing performance testing device according to claim 3, characterized in that, The sealing protrusion has a trapezoidal cross-section, and its diameter gradually decreases along the direction close to the sealing groove. The shape of the sealing groove is adapted to the sealing protrusion.

5. The valve sealing performance testing device according to claim 4, characterized in that, The bottom surface of the sealing groove is provided with a boss, and there are multiple bosses arranged sequentially along the radial direction of the sealing groove.

6. The valve sealing performance testing device according to claim 5, characterized in that, The cross-section of the boss is semi-circular.

7. The valve sealing performance testing device according to claim 1, characterized in that, It also includes a calculation module and a control system. The calculation module is used to calculate the volume of air entering the test space within the preset measurement time interval, i.e. the leakage, based on the initial and final vacuum levels measured by the vacuum gauge, the volume of the test space, and the preset measurement time interval. It also calculates the leakage rate of the air valve to be tested based on the theoretical flow meter of the air valve to be tested. The calculation module, the vacuum pump, and the vacuum gauge are electrically connected to the control system.

8. The valve sealing performance testing device according to claim 1, characterized in that, The vacuum pump includes a diffusion vacuum pump.

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