Test tool of pressure sensor

Abstract

The utility model relates to a test tool of a pressure sensor, which comprises a pressure tank, the pressure tank comprises a tank body and a cover body, the tank body is provided with an accommodating cavity, the test tool is characterized by further comprising a PCB (printed circuit board), the PCB covers the tank body, the cover body covers the PCB, the PCB is provided with an air hole communicated with the accommodating cavity, and the air hole is communicated with the accommodating cavity. The cover body is provided with an air inlet hole communicated with the air hole in a penetrating mode, the containing cavity is further internally provided with a plug connector used for being connected with a to-be-tested pressure sensor semi-finished product, and the plug connector is electrically connected with the PCB. According to the test tool of the pressure sensor provided by the utility model, the function of the semi-finished product of the pressure sensor can be tested without obtaining a complete product through all production processes, so that the time and the material cost required by the product test are reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of sensors, in particular to a test fixture for a pressure sensor. Background Art

[0002] Among pressure sensors, ceramic capacitor pressure sensors use ceramic materials as pressure-sensitive sheets and substrates. They can convert pressure changes into changes in capacitance, and then convert the capacitance changes into voltage or current signal outputs through the back-end processing circuit to obtain the ambient pressure.

[0003] Currently, when testing pressure sensor products, the pressure sensor needs to be made into a complete finished product to provide a closed environment for the ceramic core, also known as the pressure-sensitive piece, for testing, which increases the time and material costs required for testing. Utility Model Content

[0004] The main purpose of the utility model is to provide a test fixture for a pressure sensor, aiming to reduce the time and material costs required for testing products.

[0005] To achieve the above-mentioned purpose, the utility model proposes a test fixture for a pressure sensor, including a pressure tank, which includes a tank body and a cover body, and the tank body forms a accommodating cavity. It is characterized in that it also includes a PCB board, the PCB board covers the tank body, and the cover body covers the PCB board. The PCB board is provided with an air vent connected to the accommodating cavity, and the cover body is penetrated by an air inlet connected to the air vent. The accommodating cavity is also provided with a connector for connecting to a semi-finished pressure sensor to be tested, and the connector is electrically connected to the PCB board.

[0006] According to some embodiments of the present invention, a plurality of the connectors are provided, and each of the connectors is electrically connected to the PCB board.

[0007] According to some embodiments of the present invention, the plurality of connectors are spaced apart in sequence along the circumferential direction of the vent hole.

[0008] According to some embodiments of the present invention, the connector is provided with a plurality of plug connectors of different specifications.

[0009] According to some embodiments of the present invention, an output interface is further provided on the PCB board, and the output interface is exposed outside the pressure tank.

[0010] According to some embodiments of the present invention, a first sealing ring is provided between the PCB board and the tank body; and / or a second sealing ring is provided between the PCB board and the cover body.

[0011] According to some embodiments of the present invention, when a first sealing ring is provided, a first mounting groove is formed on the tank body, the first sealing ring is disposed in the first mounting groove and partially protrudes out of the first mounting groove, and the PCB board presses the first sealing ring;

[0012] When a second sealing ring is provided, a second mounting groove is formed on the cover body, the second sealing ring is arranged in the second mounting groove and partially protrudes from the second mounting groove, and the PCB board presses the second sealing ring.

[0013] According to some embodiments of the present invention, a trachea quick connector is installed on the air inlet.

[0014] According to some embodiments of the present invention, an air inlet cavity is formed on a side of the cover body close to the PCB board, the air inlet hole is connected to the air inlet cavity, and the air vent is connected to the air inlet cavity and the accommodating cavity.

[0015] According to some embodiments of the present invention, an upper flange is provided on the periphery of the lower end of the cover body, and a lower flange is provided on the periphery of the upper end of the tank body. The upper flange, the PCB board and the lower flange are connected by fasteners.

[0016] The utility model has at least the following beneficial effects:

[0017] In the present invention, the PCB board is covered on the can body, and the cover body is covered on the PCB board. The PCB board is provided with a vent hole connected to the accommodating cavity. The cover body is provided with an air inlet hole connected to the vent hole. The accommodating cavity is also provided with a connector for connecting to the semi-finished pressure sensor to be tested, and the connector is electrically connected to the PCB board. By sequentially covering and connecting the cover body, PCB board, and can body, a sealed accommodating cavity required for product testing is formed. The semi-finished pressure sensor to be tested is then placed in the accommodating cavity and connected to the connector. A pressure supply device is externally connected to the air inlet hole to provide a sealed environment with a stable pressure value for functional testing of the semi-finished pressure sensor to be tested. This allows functional testing of the product without having to go through all production steps to obtain a complete product, reducing the time and material costs required for product testing. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0019] Figure 1A schematic structural diagram of a pressure sensor test fixture provided by an embodiment of the present utility model;

[0020] Figure 2 for Figure 1 Schematic cross-section of the test fixture for the pressure sensor.

[0021] Description of reference numerals:

[0022] 100-test tooling; 1-pressure tank; 11-tank body; 111-first mounting slot; 12-cover; 121-air inlet; 122-second mounting slot; 123-air inlet cavity; 13-accommodation cavity; 2-PCB board; 21-air vent; 22-connector; 23-output interface; 24-wiring harness; 3-first sealing ring; 4-second sealing ring; 5-trachea quick connector; 6-semi-finished pressure sensor. DETAILED DESCRIPTION

[0023] The following is a clear and complete description of the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0024] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement status, etc. between the various components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indications will also change accordingly.

[0025] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or suggesting their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of such features. In addition, the meaning of "and / or" appearing throughout the text includes three parallel schemes. Taking "A and / or B" as an example, it includes scheme A, or scheme B, or a scheme in which A and B are satisfied at the same time. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is mutually contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0026] The utility model provides a test fixture for a pressure sensor. Figure 1-Figure 2This is a specific embodiment of a pressure sensor testing tool provided by the utility model.

[0027] like Figure 1-Figure 2 An embodiment of the present utility model provides a test fixture 100 for a pressure sensor, comprising a pressure tank 1, wherein the pressure tank 1 comprises a tank body 11 and a cover body 12, wherein the tank body 11 is formed with a receiving cavity 13, and further comprises a PCB board 2, wherein the PCB board 2 is covered on the tank body 11, and the cover body 12 is covered on the PCB board 2, and an air vent 21 communicating with the receiving cavity 13 is provided on the PCB board 2, and an air inlet 121 communicating with the air vent 21 is penetrated on the cover body 12, and a connector 22 for connecting to a semi-finished pressure sensor to be tested is further provided in the receiving cavity 13, and the connector 22 is electrically connected to the PCB board 2.

[0028] In the present invention, the PCB board 2 is attached to the can body 11, and the cover body 12 is attached to the PCB board 2. The PCB board 2 is provided with a vent hole 21 communicating with the accommodating cavity 13. The cover body 12 is provided with an air inlet hole 121 communicating with the vent hole 21. The accommodating cavity 13 is also provided with a connector 22 for connecting to the semi-finished pressure sensor to be tested. The connector 22 is electrically connected to the PCB board 2. By sequentially attaching the cover body 12, the PCB board, and the can body 11, a sealed accommodating cavity 13 is formed for product testing. The semi-finished pressure sensor to be tested is then placed in the accommodating cavity 13 and connected to the connector 22. An external pressure supply device is connected to the air inlet hole 121, thereby providing a sealed environment with a stable pressure value for functional testing of the semi-finished pressure sensor to be tested. This allows functional testing of the product without having to go through all the production steps to obtain a complete product, reducing the time and material costs required for product testing.

[0029] It should be noted that the pressure sensor semi-finished product 6 used for testing is a semi-finished product obtained by welding a ceramic core, an FPC and a terminal button together through a welding process. The semi-finished product has not yet been assembled with a shell, so it cannot provide a closed environment for product testing. The test tool 100 provided in this application is designed based on this semi-finished pressure sensor.

[0030] Specifically, in some embodiments, multiple connectors 22 are provided, each of which is electrically connected to the PCB. Since the accommodating cavity 13 generally provides sufficient space for semi-finished products, by providing multiple connectors 22, multiple products to be tested can be connected to the connectors 22 within the tank body 11 and tested simultaneously, greatly improving product testing efficiency.

[0031] Furthermore, in some embodiments, the plurality of connectors 22 are spaced apart in sequence along the circumferential direction of the air vent 21. This arrangement avoids the close arrangement of the plurality of connectors 22, and rationally utilizes the plate area of ​​the PCB board 2 in the pressure tank 1. Moreover, in this embodiment, the air vent 21 and the air inlet 121 are coaxially arranged, which is conducive to the direct entry of gas into the accommodating cavity 13. The spaced-apart arrangement of the plurality of connectors 22 along the circumferential direction of the air vent 21 can also reduce the obstruction to the airflow.

[0032] Specifically, considering that the pressure sensors to be tested usually have multiple specifications, in order to improve the versatility of the test tool 100, in some embodiments, the connector 22 is provided with multiple plug connectors of different specifications. Through this setting, semi-finished pressure sensors of different specifications can be tested.

[0033] Specifically, in some embodiments, the connector 22 is connected to the PCB board 2 through a wiring harness 24. Through this arrangement, the connector 22 has a certain amount of movement under the action of the wiring harness 24, which is beneficial for the operator to extend the product to be tested into the tank body 11 for connection with the connector 22. It can also adapt to products to be tested of different sizes and avoid the product to be tested being suspended in the accommodating cavity 13 after being connected to the connector 22, thereby affecting the connection reliability. The wiring harness 24 can provide a certain amount of movement for the product to be tested, so that the product to be tested can be stably placed at the bottom of the accommodating cavity 13 after being connected to the connector 22.

[0034] Specifically, in some embodiments, a first sealing ring 3 is provided between the PCB board 2 and the can body 11, and / or a second sealing ring 4 is provided between the PCB board 2 and the cover body 12. The first sealing ring 3 and the second sealing ring 4 respectively improve the sealing between the PCB board 2 and the can body 11 and between the PCB board 2 and the cover body 12, thereby providing a more effectively sealed enclosed space.

[0035] Furthermore, in some embodiments, when a first sealing ring 3 is provided, a first mounting groove 111 is formed on the can body, the first sealing ring 3 is disposed in the first mounting groove 111 and partially protrudes out of the first mounting groove 111, and the PCB board 2 compresses the first sealing ring 3. When a second sealing ring 4 is provided, a second mounting groove 122 is formed on the cover body, the second sealing ring 4 is disposed in the second mounting groove 122 and partially protrudes out of the second mounting groove 122, and the PCB board 2 compresses the second sealing ring 4. With this arrangement, the first mounting groove 111 and the second mounting groove 122 provide accommodation space for the first sealing ring 3 and the second sealing ring 4, respectively, ensuring that the sealing rings are fully accommodated therein, thereby avoiding the problem of poor sealing caused by direct contact with uneven or concave surfaces. The compression of the first and second sealing rings 3 and 4 by the PCB board 2 not only provides a more reliable sealing effect, but also prevents them from loosening or shifting due to vibration, impact, or pressure changes during operation, thereby improving the stability of the seal.

[0036] Specifically, in some embodiments, a trachea quick connector 5 is installed on the air inlet 121. The trachea quick connector 5 is used to connect a pressure supply device. The trachea quick connector 5 can realize rapid connection and disassembly of the trachea, which is conducive to selecting and switching pressure supply devices of different specifications.

[0037] Specifically, in some embodiments, the PCB board 2 is further provided with an output interface 23, and the output interface 23 is exposed outside the pressure tank. The output interface 23 on the PCB board 2 can synchronously output the test data of the semi-finished pressure sensor during the test process, which is convenient for users to collect and analyze.

[0038] Specifically, in some embodiments, an air inlet cavity 123 is formed on a side of the cover 12 adjacent to the PCB board 2. The air inlet hole 121 communicates with the air inlet cavity 123, and the air vent 21 communicates with the air inlet cavity 123 and the accommodating cavity 13. Providing the air inlet cavity 123 on the cover 12 disperses the pressure exerted on the accommodating cavity 13 within the tank body 11, thereby enhancing the overall structural strength and stability of the pressure tank 1.

[0039] Specifically, in some embodiments, an upper flange is provided at the lower periphery of the cover 12, and a lower flange is provided at the upper periphery of the tank body 11. The upper flange, the PCB board 2, and the lower flange are connected by fasteners. This flange connection not only improves connection stability but also provides a good sealing effect.

[0040] Specifically, in some embodiments, the air inlet 121 is connected to a pressure regulating valve, which is externally connected to a pressure supply device. The pressure regulating valve can adjust the air pressure in the accommodating chamber 13 to a specified pressure according to test requirements to obtain a target pressure environment for testing.

[0041] The test operation process of the test fixture 100 of the pressure sensor provided by the present invention is as follows: first, the product to be tested is connected to the connector on the PCB board 2, and the product is placed in the accommodating cavity 13 in the tank body 11. Then, the PCB board 2 and the cover body 12 are sequentially covered on the tank body 11, and the first sealing ring 3 is ensured to be in the first installation groove 111, and the second sealing ring 4 is in the second sealing groove. Then, the cover body 12, the PCB board 2 and the tank body 11 are tightened with screws to ensure sealing. Finally, they are connected to the pressure supply equipment through the air pipe quick connector 5. After the pressure supply equipment provides a target pressure environment for the accommodating cavity 13, the product function is tested, and the product test data is output through the output interface 23 of the PCB board 2 exposed outside the pressure tank 1, completing synchronous data monitoring to obtain the required product data.

[0042] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A test fixture for a pressure sensor, comprising a pressure tank, wherein the pressure tank comprises a tank body and a cover body, wherein the tank body is formed with a receiving cavity, wherein: The container further includes a PCB board, the PCB board is covered on the container body, the cover body is covered on the PCB board, the PCB board is provided with an air vent connected to the accommodating cavity, the cover body is penetrated by an air inlet connected to the air vent, the accommodating cavity is further provided with a connector for connecting to a semi-finished pressure sensor to be tested, and the connector is electrically connected to the PCB board.

2. The pressure sensor test fixture according to claim 1, wherein: A plurality of the connectors are provided, and each of the connectors is electrically connected to the PCB board.

3. The pressure sensor test fixture according to claim 2, wherein: The plurality of connectors are sequentially spaced apart along the circumferential direction of the vent hole.

4. The pressure sensor test fixture according to claim 1, wherein: The plug connector is provided with a plurality of plug connectors of different specifications.

5. The pressure sensor test fixture according to claim 1, wherein: The PCB board is also provided with an output interface, and the output interface is exposed outside the pressure tank.

6. The pressure sensor test fixture according to claim 1, wherein: A first sealing ring is provided between the PCB board and the tank body; and / or a second sealing ring is provided between the PCB board and the cover body.

7. The pressure sensor test fixture according to claim 6, characterized in that: When a first sealing ring is provided, a first mounting groove is formed on the tank body, the first sealing ring is arranged in the first mounting groove and partially protrudes from the first mounting groove, and the PCB board presses the first sealing ring; When a second sealing ring is provided, a second mounting groove is formed on the cover body, the second sealing ring is arranged in the second mounting groove and partially protrudes from the second mounting groove, and the PCB board presses the second sealing ring.

8. The pressure sensor test fixture according to claim 1, wherein: A trachea quick connector is installed on the air inlet.

9. The pressure sensor test fixture according to claim 1, wherein: An air inlet cavity is formed on one side of the cover body close to the PCB board, the air inlet hole is communicated with the air inlet cavity, and the air vent is communicated with the air inlet cavity and the accommodating cavity.

10. The pressure sensor test fixture according to claim 9, characterized in that: An upper flange is provided at the periphery of the lower end of the cover body, and a lower flange is provided at the periphery of the upper end of the tank body. The upper flange, the PCB board and the lower flange are connected by fasteners.

Images