Temperature sensor airtightness testing device

Abstract

The utility model provides an airtight testing device for a temperature sensor. The airtight testing device comprises a detection tool cavity, a water tank arranged on the upper side in the detection tool cavity, an air chamber arranged on the lower side in the detection tool cavity, and an air inlet device arranged on the outer side of the detection tool cavity and communicated with the air chamber. At least one temperature sensor mounting hole is formed in the bottom of the water tank, the temperature sensor mounting hole is communicated with the water tank and the air chamber, and a temperature sensor is mounted at the temperature sensor mounting hole through a sealing gasket. According to the utility model, simultaneous measurement of a single temperature sensor or multiple temperature sensors can be realized, the operation is convenient, and the detection efficiency is high.

Description

Technical Field

[0001] The utility model relates to the field of temperature sensor detection, specifically, to a hermeticity testing device for temperature sensors. Background Art

[0002] The PT100 temperature sensor is a device used to measure the temperature during the installation of motors, generators, transformer windings, and ultra-low temperature equipment. Its function is to convert the temperature change of gas or liquid into an electrical signal and provide it to the control unit. After receiving the temperature signal, the control unit performs temperature control operations. Before using the temperature sensor, it needs to be subjected to hermeticity detection.

[0003] Before the arrival of the PT100 component parts of the temperature sensor for installation, since there is no corresponding detection instrument or device that can conveniently and quickly detect whether the hermeticity of the PT100 component parts of the temperature sensor is qualified, the method usually adopted by incoming inspection personnel is to visually inspect the appearance with the naked eye for obvious visible defects. In the case of a good appearance, simple water testing is used to judge whether the incoming parts are qualified in hermeticity. Such an incoming inspection and testing method has low efficiency and low rigor, resulting in inaccurate inspection results during the incoming hermeticity inspection of the PT100 temperature sensor, causing the parts to flow into the actual production line as parts with qualified hermeticity, resulting in the need to perform hermeticity detection again after the temperature sensor is assembled. For example, CN212513475U provides a hermeticity detection device for temperature sensors, which can perform hermeticity detection on the temperature sensor after it is installed on the vehicle. However, this method can only detect a single temperature sensor. The phenomenon of rework inspection due to the unqualified hermeticity of the temperature sensor detected by the above detection device occurs frequently, which has a certain impact on the order production plan. Moreover, the above detection device can only detect one temperature sensor at a time, and the detection efficiency is low.

[0004] In order to solve the above existing problems, people have been seeking an ideal technical solution. Summary of the Invention

[0005] The purpose of the utility model is to address the deficiencies of the prior art and thus provide a hermeticity testing device for temperature sensors.

[0006] To achieve the above purpose, the technical solution adopted by the utility model is: a hermeticity testing device for temperature sensors, including a detection tooling cavity, a water tank arranged on the upper side inside the detection tooling cavity, an air chamber arranged on the lower side inside the detection tooling cavity, and an air inlet device arranged outside the detection tooling cavity and communicated with the air chamber;

[0007] At least one temperature sensor mounting hole is formed in the bottom of the water tank. The temperature sensor mounting hole communicates with the water tank and the air chamber, and the temperature sensor is mounted at the temperature sensor mounting hole through a sealing gasket.

[0008] Through the sealing arrangement between the temperature sensor mounting hole at the bottom of the water tank and the air chamber, the above-mentioned temperature sensor airtight test device can realize the simultaneous measurement of a single temperature sensor or multiple temperature sensors, with convenient operation and high detection efficiency.

[0009] Further, the air inlet device includes an air inlet pipe, a residual pressure release valve communicated with the air inlet pipe, and a guide pipe communicated with the residual pressure release valve. The guide pipe is also communicated with the air inlet of the air chamber.

[0010] The setting of the residual pressure release valve can exhaust the residual gas in the air chamber after the detection, and has the function of residual pressure release protection. Description of the Drawings

[0011] Figure 1 is a schematic structural diagram of the present utility model.

[0012] Figure 2 is a schematic structural diagram of the present utility model without the temperature sensor installed.

[0013] In the figure: 1. Detection tooling cavity; 2. Water tank; 3. Temperature sensor mounting hole; 4. Temperature sensor; 5. Sealing gasket; 6. Residual pressure release valve; 7. Air inlet pipe; 8. Pipe joint; 9. Silencer; 10. Plug; 11. Guide pipe; 12. Residual pressure release valve mounting bracket. Detailed Embodiments

[0014] The technical solution of the present utility model will be further described in detail below through specific embodiments.

[0015] Embodiment 1

[0016] This embodiment provides a temperature sensor airtight test device, as Figure 1-2 shown, including a detection tooling cavity 1, a water tank 2 arranged on the upper side inside the detection tooling cavity 1, an air chamber arranged on the lower side inside the detection tooling cavity 1, and an air inlet device arranged outside the detection tooling cavity 1 and communicated with the air chamber;

[0017] At least one temperature sensor mounting hole 3 is formed in the bottom of the water tank 2. The temperature sensor mounting hole 3 communicates with the water tank 2 and the air chamber, and the temperature sensor 4 is mounted at the temperature sensor mounting hole 3 through a sealing gasket 5.

[0018] Preferably, the sealing gasket 5 is an M6 stainless steel BS / A combined gasket.

[0019] In use, first connect the intake device to the air chamber, then install a sealing washer 5 on the temperature sensor and install the temperature sensor 4 into the temperature sensor mounting hole 3. The sealing washer 5 seals the gap between the temperature sensor 4 and the temperature sensor mounting hole 3. After the temperature sensor 4 is installed, inject appropriate water into the water tank 2. After the water injection is completed, open the intake device to inject gas into the air chamber.

[0020] It should be noted that the sealed cavity of the temperature sensor 4 is connected to its air inlet. The gas in the air chamber enters the sealed cavity through the air inlet of the temperature sensor 4. If the sealed cavity leaks, bubbles will emerge at the position of the temperature sensor mounting hole 3.

[0021] After water injection and gas injection, observe whether there are continuous bubbles emerging near the temperature sensor mounting hole 3. If there are no bubbles, it indicates that the airtightness test of this batch of temperature sensors 4 is qualified. If there are continuous bubbles emerging at one or more positions near the temperature sensor mounting hole 3, it indicates that the airtightness test of the temperature sensor 4 at the temperature sensor mounting hole 3 is unqualified.

[0022] It can be seen that through the sealing setting between the temperature sensor mounting hole 3 at the bottom of the water tank 4 and the air chamber, the above temperature sensor airtightness test device can realize the simultaneous measurement of a single temperature sensor or multiple temperature sensors, with convenient operation and high detection efficiency.

[0023] Preferably, the temperature sensor mounting hole 3 is an internal thread mounting hole. Under normal circumstances, the outside of the temperature sensor 4 is generally provided with an external thread. In order to fix the temperature sensor 4, the temperature sensor mounting hole 3 is set to an internal thread structure. In use, the temperature sensor 4 is screwed into the temperature sensor mounting hole 3 from top to bottom by an electric torque wrench, so as to firmly fix the temperature sensor 4 on the water tank 2 through threaded connection.

[0024] Furthermore, at least one exhaust port is provided on the air chamber, and the exhaust port is provided with a plug 10. Specifically, when the temperature sensor mounting holes 3 are arranged in two rows side by side, in order to facilitate the gas in the air chamber to smoothly flow into the sealed cavity of the temperature sensor 4, two air channels that are connected end to end are provided in the air chamber corresponding to the two rows of temperature sensor mounting holes 3, and the air inlet of the temperature sensor 4 is connected to the air channel. Before use, open the plug 10, and the gas flows along the air channel to the exhaust port. After the gas is evenly distributed, then use the plug 10 to block the exhaust port.

[0025] In one embodiment, the intake device includes an intake pipe 7, a residual pressure release valve 6 communicated with the intake pipe 7, and a guide pipe 11 communicated with the residual pressure release valve 6. The guide pipe 11 is also communicated with the air inlet of the air chamber. Preferably, the residual pressure release valve 6 is fixedly installed outside the detection tooling cavity 1 through a residual pressure release valve mounting bracket 12.

[0026] The setting of the residual pressure release valve 6 can discharge the residual gas in the air chamber after the detection, and has the function of residual pressure release protection. Preferably, the residual pressure release valve includes a switch valve and a non-switch valve. In this application, a non-switch valve is selected, which cannot be automatically opened and closed and needs to be manually switched. Specifically, a 3-way SMC residual pressure release valve is selected. One end of the 3-way SMC residual pressure release valve is connected to the intake pipe 7 through a pipe joint 8, one end is connected to the guide pipe 11 through a pipe joint 8, and the guide pipe 11 is connected to the air inlet of the air chamber through a pipe joint 8. The knob switch of the residual pressure release valve 6 has two position states, namely SUP and EXE. When the knob switch of the residual pressure release valve 6 is rotated to the SUP position, it is for connecting the air supply, and when it is rotated to the EXH position, it is for disconnecting the exhaust. By default, the knob switch of the residual pressure release valve 6 is located at the SUP position.

[0027] During use, after turning off the switch at the air source at the end of the detection, open the plug 10, and rotate the knob switch of the residual pressure release valve 6 to the EXH position multiple times to exhaust the residual pressure of the air chamber. The gas in the air chamber is discharged through the exhaust port. After discharging the residual gas in the cavity, the air source pipe at the intake pipe 7 of the intake device can be conveniently and quickly unplugged.

[0028] During the process of the residual pressure release valve 6 releasing the excess pressure, sound will be generated. In order to eliminate the sound, a silencer 9 is also provided at the lower part of the residual pressure release valve 6, that is, the third end of the 3-way SMC residual pressure release valve, to absorb the noise and vibration in the intake device and also ensure the smooth discharge of the gas in the intake device.

[0029] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit them. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that: it is still possible to modify the specific implementation manners of the present invention or perform equivalent replacements for some technical features; without departing from the spirit of the technical solutions of the present invention, they should all be covered within the scope of the technical solutions claimed by the present invention.

Claims

1. A temperature sensor airtightness test device, characterized in that: It includes a detection tool cavity, a water tank arranged on the upper side of the detection tool cavity, an air chamber arranged on the lower side of the detection tool cavity, and an air intake device arranged outside the detection tool cavity and connected to the air chamber; At least one temperature sensor installation hole is provided at the bottom of the water tank, the temperature sensor installation hole is connected with the water tank and the air chamber, and the temperature sensor is installed at the temperature sensor installation hole through a sealing gasket.

2. The temperature sensor airtightness testing device according to claim 1, characterized in that: The air intake device includes an air intake pipe, a residual pressure release valve connected to the air intake pipe, and an air guide pipe connected to the residual pressure release valve. The air guide pipe is also connected to the air intake port of the air chamber.

3. The temperature sensor airtightness testing device according to claim 2, characterized in that: A muffler is also arranged at the lower part of the residual pressure release valve.

4. The temperature sensor airtightness testing device according to claim 2 or 3, characterized in that: The air chamber is provided with at least one exhaust port, and the exhaust port is provided with a plug.

5. The temperature sensor airtightness testing device according to any one of claims 1 to 3, characterized in that: The temperature sensor mounting hole is an internal thread mounting hole.

6. The temperature sensor airtightness testing device according to any one of claims 1 to 3, characterized in that: The sealing gasket is an M6 stainless steel BS / A combined gasket.

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