Testing tool for detecting sealing performance of piezoelectric valve

Abstract

The utility model relates to the technical field of fusion engineering, in particular to a test tool for detecting the sealing performance of a piezoelectric valve. The conical head mounting device is arranged at one end of the mounting seat and is used for bearing a conical head; the plug mounting device is arranged at the other end of the mounting base and used for bearing a plug, and the conical head and the plug are coaxially and oppositely arranged; the displacement regulator is fixedly connected with one of the conical head mounting device and the plug mounting device and is used for regulating the pressure between the plug and the conical head; the force sensor is fixedly connected with the other one of the conical head mounting device and the plug mounting device and is used for measuring the pressure applied between the plug and the conical head; the conical head is provided with an air inlet and an air outlet, and the air outlet direction of the air outlet faces the plug. Air enters the air inlet hole in the plug, when a sealing state is achieved, the force sensor can measure pressure applied between the conical head and the plug when the conical head and the plug are in the sealing state, and therefore sealing parameters between the conical head and the plug can be accurately measured.

Description

Technical Field

[0001] This application relates to the field of fusion engineering technology, specifically to a test fixture for detecting the sealing performance of a piezoelectric valve. Background Technology

[0002] In magnetically confined controlled nuclear fusion devices, the gas delivery system is crucial for heating plasma and diagnostic applications, and the gas delivery valve is a key component of the gas delivery system. The valve's flow rate, response time, and controllability play a very important role in the gas delivery.

[0003] To improve air delivery accuracy and response speed, a piezoelectric valve can be used as the air delivery valve. For example, a piezoelectric valve can be used... Figure 1 The piezoelectric valve shown has a cone 1 installed on its vent to improve its sealing performance. The plug 2 (sealing gasket) on the piezoelectric actuator 3 of the piezoelectric valve fits and seals against the cone 1.

[0004] The sealing parameters between cone 1 and plug 2 characterize the sealing accuracy of the piezoelectric valve when it is closed. Therefore, how to accurately test the sealing parameters between the cone and plug in the piezoelectric valve has become a technical problem that urgently needs to be solved. Utility Model Content

[0005] This application provides a test fixture for detecting the sealing performance of a piezoelectric valve, thereby solving the technical problem mentioned in the background art of how to accurately test the sealing parameters between the cone and the plug in a piezoelectric valve.

[0006] According to a first aspect, this application provides a test fixture for detecting the sealing performance of a piezoelectric valve, comprising: a mounting base; a cone mounting device disposed at one end of the mounting base for supporting the cone; a plug mounting device disposed at the other end of the mounting base for supporting the plug, wherein the cone and the plug are coaxially opposite to each other; a displacement adjuster fixedly connected to the cone mounting device or the plug mounting device for adjusting the pressure between the plug and the cone; a force sensor fixedly connected to the cone mounting device or the plug mounting device for measuring the applied pressure between the plug and the cone; wherein the cone is provided with an air inlet and an air outlet, the air outlet being directed toward the plug.

[0007] In one embodiment, the displacement adjuster and the force sensor are fixedly mounted opposite each other on the mounting base, the plug mounting device is mounted on the side of the displacement adjuster facing the force sensor, and the cone mounting device is mounted on the side of the force sensor facing the displacement adjuster.

[0008] In one embodiment, the test fixture further includes a displacement measuring device mounted on the mounting base for measuring the displacement between the cone and the plug.

[0009] In one embodiment, the displacement measuring device includes a laser sensor and a target, one of which is fixedly mounted, and the other moves with the cone or the plug.

[0010] In one embodiment, the laser sensor is mounted on the mounting base, and the target is mounted on the displacement adjuster.

[0011] In one embodiment, the plug mounting device includes: a support column and a clamping nut that is threadedly connected to the support column. The clamping nut has a groove inside, and the plug is disposed in the groove. The plug is fixed when the support column and the clamping nut are threadedly locked.

[0012] In one embodiment, the diameter of the plug is smaller than the inner diameter of the empty groove.

[0013] In one embodiment, the testing fixture further includes: an air source connected to the air inlet; and a pressure detection device for detecting the inflation pressure inside the cone.

[0014] In one embodiment, the cone head may be cone-shaped or spherical.

[0015] In one embodiment, the force sensor includes a planar tensile / compressive sensor or a pressure sensor.

[0016] This application has at least the following beneficial effects:

[0017] The test fixture for detecting the sealing performance of a piezoelectric valve includes a mounting base; a cone mounting device disposed at one end of the mounting base for supporting the cone; a plug mounting device disposed at the other end of the mounting base for supporting the plug, wherein the cone and the plug are coaxially opposite each other; a displacement adjuster fixedly connected to the cone mounting device or the plug mounting device for adjusting the pressure between the plug and the cone; a force sensor fixedly connected to the cone mounting device or the plug mounting device for measuring the applied pressure between the plug and the cone; the plug is provided with an air inlet and an air outlet, wherein the air outlet is directed towards the plug. Driven by the displacement adjuster, the plug and the cone move towards each other. After the plug and the cone come into contact, the pressure between the plug and the cone can be adjusted. After the force sensor applies pressure between the cone and the plug, it measures the pressure applied between the plug and the cone. By introducing air into the air inlet on the plug, when a sealing state is reached, the force sensor can measure the pressure applied between the cone and the plug when a sealing state is reached, so as to accurately measure the sealing parameters between the cone and the plug.

[0018] To make the above-mentioned objectives, features and advantages of this application more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description

[0019] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the structure of the piezoelectric valve provided in the embodiments of this application;

[0021] Figure 2 This is a schematic diagram of the structure of the test fixture for detecting the sealing performance of a piezoelectric valve provided in an embodiment of this application;

[0022] Figure 3 This is a schematic diagram of the cross-section of a test fixture for detecting the sealing performance of a piezoelectric valve, provided in an embodiment of this application.

[0023] The diagram is shown below:

[0024] 1. Cone head; 11. Air inlet; 12. Air outlet; 2. Plug; 3. Piezoelectric actuator; 10. Mounting base; 11. Base; 12. First mounting plate; 13. Second mounting plate; 20. Cone head mounting device; 30. Plug mounting device; 31. Support column; 32. Compression nut; 33. Displacement stage adapter; 40. Displacement adjuster; 50. Force sensor; 60. Displacement measuring device; 61. Laser sensor; 62. Target. Detailed Implementation

[0025] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely represents selected embodiments of this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0026] This application provides a test fixture for detecting the sealing performance of a piezoelectric valve, such as... Figure 2 andFigure 3 As shown, the test fixture includes a mounting base 10; a cone mounting device 20, disposed at one end of the mounting base 10, for supporting a cone 1; a plug mounting device 30, disposed at the other end of the mounting base 10, for supporting a plug 2, wherein the cone 1 and the plug 2 are coaxially opposite to each other; a displacement adjuster 40, fixedly connected to the cone mounting device 20 or the plug mounting device 30, for adjusting the pressure between the plug 2 and the cone 1; a force sensor 50, fixedly connected to the cone mounting device 20 or the plug mounting device 30, for measuring the applied pressure between the plug 2 and the cone 1; the cone 1 is provided with an air inlet 11 and an air outlet 12, wherein the air outlet 12 is directed toward the plug 2.

[0027] In this embodiment, driven by the displacement adjuster 40, the plug 2 and the cone 1 move towards each other. After the plug 2 and the cone 1 come into contact, the pressure between the plug 2 and the cone 1 can be adjusted. After the force sensor 50 applies pressure between the cone 1 and the plug 2, it measures the pressure applied between the plug 2 and the cone 1. At the same time, air enters through the air inlet on the cone 1. When a sealing state is reached, the force sensor 50 can measure the pressure applied between the cone 1 and the plug 2 when a sealing state is reached, so as to accurately measure the sealing parameters between the cone 1 and the plug 2.

[0028] In this embodiment, the testing fixture further includes an air source connected to the air inlet; and a pressure detection device for detecting the inflation pressure inside the cone. By inflating the cone 1 with the air source, the pressure detection device can measure the intake air pressure inside the cone 1 in real time. The intake air pressure detected by the pressure detection device and the applied pressure detected by the force sensor 50 are used to determine the sealing parameters between the cone 1 and the plug 2. For example, air can be continuously introduced through the air inlet, and the pressure applied between the cone 1 and the plug 2 can be continuously increased until the pressure detection device detects that the intake air pressure is stable, thereby determining the sealing pressure between the cone 1 and the plug 2. Alternatively, a fixed pressure can be applied between the cone 1 and the plug 2, and the intake pressure can be continuously increased until it stabilizes, thereby determining the pressure value that the fixed pressure applied to the cone 1 and the plug 2 can withstand. Alternatively, a fixed intake pressure can be applied, and the pressure applied to the cone 1 and plug 2 can be continuously increased until a stable state is reached. This allows for the determination of the pressure value required to achieve a sealing state under a fixed gas pressure. Based on this test fixture, comprehensive and accurate sealing parameters between the cone 1 and plug 2 can be obtained.

[0029] In one embodiment, the cone 1 has a cone or spherical shape. The force sensor 50 includes a planar tension / compression sensor or a pressure sensor.

[0030] In one embodiment, the mounting base 1 includes a base 11 and a first mounting plate 12 and a second mounting plate 13 disposed opposite each other on both sides of the base 11. A displacement adjuster 40 is mounted on one of the first mounting plate 12 and the second mounting plate 13, and a force sensor 50 is mounted on the other of the first mounting plate 12 and the second mounting plate 13. A cone-shaped mounting device 20 mounts one of the displacement adjuster 40 or the force sensor 50, and a plug-shaped mounting device 30 mounts the other of the displacement adjuster 40 or the force sensor 50.

[0031] Figure 1 The piezoelectric valve shown has a plug 2 mounted on the piezoelectric actuator 3 that moves toward or away from the cone head 1 to seal or open the air outlet passage of the piezoelectric valve. Therefore, in order to reproduce the sealing process of the piezoelectric valve, in this embodiment, the plug mounting device 30 is mounted on the displacement adjuster 40, the cone head mounting device 20 is mounted on the force sensor 50, and the displacement adjuster 40 drives the plug 2 to move toward the cone head 1.

[0032] In one embodiment, the plug mounting device 30 includes a support column 31 and a clamping nut 32 threadedly connected to the support column 31. The clamping nut 32 has a hollow groove inside, and the plug 2 is disposed in the hollow groove. The plug 2 is fixed when the support column 31 and the clamping nut 32 are locked together by the threads. A thread is provided at the end of the support column 31 away from the displacement adjuster 40 to mate with the clamping nut 32. The plug 2 is disposed in the hollow groove of the clamping nut 32, and the plug 2 is fixed by locking the clamping nut 32 and the support column 31 together. The diameter of the plug 2 is smaller than the inner diameter of the hollow groove, so that during installation, the position of the plug 2 can be adjusted within the hollow groove so that the center of the plug 2 is aligned with the axis of the cone head 1.

[0033] A displacement table adapter 33 is also provided between the support column 31 and the displacement adjuster 31. The displacement table adapter 33 is connected to the displacement adjuster 40 by bolts.

[0034] In one embodiment, the test fixture further includes a displacement measuring device 60, mounted on the mounting base 10, capable of measuring the displacement between the cone 1 and the plug 2. In this embodiment, the displacement measuring device 60 may include a potentiometer-type displacement sensor, an inductive displacement sensor, a capacitive displacement sensor, an eddy current displacement sensor, a Hall effect displacement sensor, an ultrasonic displacement sensor, and a laser displacement sensor. For example, using a potentiometer-type displacement sensor, a variable resistance slide rail can be fixed at a fixed position on the mounting base, with the slider and displacement adjuster moving accordingly. Different resistance values ​​are measured by the displacement of the slider on the slide rail to determine the displacement value of the displacement adjuster. As another example, a laser displacement sensor can be used, including a laser sensor and a target. The laser sensor is fixedly mounted on the mounting base, causing the target and displacement adjuster to move accordingly, or the target is fixedly mounted on the mounting base, causing the laser sensor and displacement adjuster to move accordingly, to measure the displacement value of the displacement adjuster. This embodiment uses a laser displacement sensor as an example for explanation.

[0035] The displacement measuring device 60 includes a laser sensor 61 and a target 62. The laser sensor 61 is mounted on the mounting base 10, and the target 62 is mounted on the displacement adjuster 40. For example, the target 62 can be mounted on the displacement stage adapter 34 between the displacement adjuster 40 and the support column 32. The target 62, in conjunction with the laser sensor 61, can accurately measure the specific displacement of the displacement adjuster 40. Furthermore, the force sensor 50, in conjunction with the laser sensor 61, can determine the relationship between the target displacement and the magnitude of the force on the contact surface when the cone 1 and the plug 2 are in contact.

[0036] In the description of this application, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this application is in use. They are only for the convenience of describing this application 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 on this application. In addition, the terms "first," "second," and "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0037] Furthermore, terms such as "horizontal," "vertical," and "sag" do not imply that components must be absolutely horizontal or suspended, but rather that they can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal relative to "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0038] In the description of this application, it should also be noted that, unless otherwise expressly specified and limited, the terms "set up," "install," "connect," and "link" 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; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0039] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application. It should be noted that similar reference numerals and letters in the following figures indicate similar items; therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

Claims

1. A test fixture for detecting the sealing performance of a piezoelectric valve, characterized in that, include: Mounting base; A cone-shaped mounting device is disposed at one end of the mounting base for supporting the cone-shaped head; A plug mounting device is disposed at the other end of the mounting base for supporting the plug, wherein the cone and the plug are coaxially opposite to each other; A displacement adjuster, fixedly connected to one of the cone mounting device or the plug mounting device, is used to adjust the pressure between the plug and the cone. A force sensor, fixedly connected to another of the cone mounting device or the plug mounting device, is used to measure the applied pressure between the plug and the cone. The cone head is provided with an air inlet and an air outlet, with the air outlet pointing towards the plug.

2. The test fixture as described in claim 1, characterized in that, The displacement adjuster and the force sensor are fixedly mounted opposite each other on the mounting base. The plug mounting device is mounted on the side of the displacement adjuster facing the force sensor, and the cone mounting device is mounted on the side of the force sensor facing the displacement adjuster.

3. The test fixture as described in claim 1, characterized in that, Also includes: A displacement measuring device, mounted on the mounting base, is used to measure the displacement between the cone and the plug.

4. The test fixture as described in claim 3, characterized in that, The displacement measuring device includes a laser sensor and a target, one of which is fixedly installed, while the other moves with the cone or the plug.

5. The test fixture as described in claim 4, characterized in that, The laser sensor is mounted on the mounting base, and the target is mounted on the displacement adjuster.

6. The test fixture as described in claim 1 or 2, characterized in that, The plug installation device includes: a support column and a clamping nut that is threadedly connected to the support column. The clamping nut has a hollow groove inside, and the plug is disposed in the hollow groove. The plug is fixed when the support column and the clamping nut are locked together by threads.

7. The test fixture as described in claim 6, characterized in that, The diameter of the plug is smaller than the inner diameter of the empty groove.

8. The test fixture as described in claim 1, characterized in that, Also includes: The air source is connected to the air inlet. A pressure detection device is used to detect the inflation pressure inside the cone.

9. The test fixture as described in claim 1, characterized in that, The cone head can be cone-shaped or spherical.

10. The test fixture as described in claim 1, characterized in that, Force sensors include planar tensile and compressive sensors or pressure sensors.

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