A leak-proof temperature sensor and a manufacturing method thereof

Abstract

The present application relates to a kind of leakproof temperature sensor and its manufacturing method, including sequentially communicating sensor cavity, first sealing cavity and second sealing cavity from bottom to top;The sensor cavity is used to place sensor element;The inner wall of the first sealing cavity is provided with the first injection hole for injecting first sealing material, and the first injection hole is communicated with the outside through wall body;The inner wall of the second sealing cavity is provided with the second injection hole for injecting second sealing material, and the second injection hole is communicated with the outside through wall body.The present application can effectively improve the long-term protection and leakproof ability of sensor.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of temperature detection, in particular to a leakproof temperature sensor and a manufacturing method thereof. BACKGROUND

[0002] Although there are many temperature measurement methods, in many cases, for actual engineering site or some special conditions of temperature measurement, such as extreme temperature, high temperature corrosive medium temperature, air temperature, surface temperature, internal temperature of solid, micro-size target temperature, large space temperature distribution, biological temperature, pressurized oil measurement, it is not easy to get accurate and reliable results, and it is necessary to be very familiar with the principles and characteristics of various measurement methods, and to select appropriate measurement methods combined with the requirements of the measured object. At the same time, new temperature measurement methods need to be constantly explored, and the original measurement technology needs to be improved to meet the temperature measurement needs under various conditions. Using sensor area segmented sealing is an effective method to improve the long-term protection level and leakproof ability of the sensor.

[0003] At present, the commonly used above-mentioned sensor leakproof methods are the first kind of fastener sealing leakproof, such as sleeve bolt, and the second kind of pouring sealing material leakproof, such as epoxy resin. Both of them can achieve the effect of sealing and leakproof in a short period of time. However, under long-term use conditions, due to thermal expansion and cold shrinkage, sealing failure often occurs under severe conditions, especially under the action of oil or mixture under pressure, sealing failure becomes inevitable, thereby seriously affecting the performance of the sensor. SUMMARY

[0004] The technical problem to be solved by the present application is to provide a leakproof temperature sensor and a manufacturing method thereof, which can be sealed and leakproof for a long time and effectively avoid sensor failure.

[0005] The technical solution adopted by the present application to solve the technical problem is: a leakproof temperature sensor is provided, which comprises a sensor cavity, a first sealing cavity and a second sealing cavity which are sequentially communicated from bottom to top; the sensor cavity is used to place a sensor element; a first injection hole for injecting a first sealing material is arranged on the inner wall of the first sealing cavity, and the first injection hole penetrates the wall body and communicates with the outside; a second injection hole for injecting a second sealing material is arranged on the inner wall of the second sealing cavity, and the second injection hole penetrates the wall body and communicates with the outside.

[0006] Further, a fixing groove for fixing the first sealing material is arranged below the first injection hole.

[0007] Further, the fixing groove is an annular groove.

[0008] Further, the fixed groove has a groove width of 6-10mm, and a taper of 45°-60°.

[0009] Further, the first sealing cavity has a conical table structure.

[0010] Further, the second sealing cavity has a cylindrical structure.

[0011] Further, the first sealing material is a soft sealing material, and the second sealing material is a hard sealing material.

[0012] Further, the first injection hole has a diameter of φ3mm-φ4mm, and the second injection hole has a diameter of φ3mm-φ4mm.

[0013] Further, the first sealing material is a high-molecular static sealing material, having a density of 1.65-1.75 at 20℃. The second sealing material is an epoxy resin sealing adhesive, having a density of 1.35 at 25℃. .

[0014] The application further provides a manufacturing method of the leak-proof temperature sensor, comprising the following steps:

[0015] (1) manufacturing a cavity of the leak-proof temperature sensor, wherein the shell comprises a sensor cavity, a first sealing cavity and a second sealing cavity which are sequentially communicated from bottom to top, a first injection hole is arranged on an inner wall of the first sealing cavity and penetrates a wall to communicate with the outside, and a second injection hole is arranged on an inner wall of the second sealing cavity and penetrates a wall to communicate with the outside;

[0016] (2) placing a sensor element in the sensor cavity;

[0017] (3) vertically placing the leak-proof temperature sensor, and injecting a first sealing material through the first injection hole under pressure, so that the injected material overflows the first injection hole;

[0018] (4) horizontally placing the leak-proof temperature sensor, and injecting a second sealing material through the second injection hole under pressure, so that the injected material is filled to a depth of half of the second injection hole.

[0019] Advantages

[0020] Compared with the prior art, the application has the following advantages and positive effects: by dividing the cavity of the leak-proof temperature sensor into a sensor cavity, a first sealing cavity and a second sealing cavity, and injecting different sealing materials into the first sealing cavity and the second sealing cavity respectively, the function of effectively improving long-term protection and sealing of the sensor is realized. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 is a structural schematic diagram of the first embodiment of the present application;

[0022] Figure 2 is a working principle diagram of injecting the first sealing material in the second embodiment of the present application;

[0023] Figure 3 is a working principle diagram of injecting the second sealing material in the second embodiment of the present application. DETAILED DESCRIPTION

[0024] The present application will be further described below in connection with specific embodiments. It should be understood that these embodiments are only used to illustrate the present application and not used to limit the scope of the present application. Furthermore, it should be understood that after reading the content taught by the present application, those skilled in the art can make various modifications or changes to the present application, and these equivalent forms also fall within the scope defined by the appended claims of the present application.

[0025] The first embodiment of the present application relates to a leak-proof temperature sensor, as shown in the figure. Figure 1 As shown in the figure, the cavity 1 of the leak-proof temperature sensor is divided into three regions from bottom to top, which are the sensor cavity 2, the first sealing cavity 6 and the second sealing cavity 5. The sensor cavity 1 is used to place the sensor element, and the first sealing cavity 6 and the second sealing cavity 5 are respectively used to inject different sealing materials. Among them, the inner wall of the first sealing cavity 6 is provided with a first injection hole 4 penetrating the wall and communicating with the outside, which is used to inject the first sealing material. The inner wall of the second sealing cavity 5 is provided with a second injection hole 3 penetrating the wall and communicating with the outside, which is used to inject the second sealing material.

[0026] Further, the lower side of the first injection hole 4 is further provided with a fixing groove 7, which is used to prevent the first sealing material from moving after solidification.

[0027] In some preferred modes of the present embodiment, the first sealing material is a soft sealing material, the first sealing cavity 6 is a conical table structure which is conducive to the flow of the soft sealing material therein, and the fixing groove 7 is an annular groove; the second sealing material is a hard sealing material, and the second sealing cavity 5 is a cylindrical structure which is connected with the first sealing cavity 6.

[0028] According to the above embodiment, the annular groove with a groove width of 6-10mm and a taper of 45°-60° is selected as the fixing groove 7. The aperture of the first injection hole 4 is φ3mm-φ4mm, and the density of the injected high molecular sealing material is 20℃, 1.65-1.75 The aperture of the second injection hole 3 is φ5mm-φ6mm, and the density of the injected epoxy resin sealing adhesive is 25℃, 1.35 .

[0029] Experiments showed that when the sealing area with the above parameters was tested, the leak-free operating time of the leak-proof temperature sensor involved in this embodiment was 540 days, while the leak-free operating time using existing fasteners was 60 days, and the leak-free operating time using existing potting materials was 180 days. Therefore, this invention can effectively improve the long-term protection and leak-proof capability of the sensor.

[0030] The second embodiment of the present invention relates to a method for manufacturing the above-mentioned leak-proof temperature sensor, specifically including:

[0031] (1) The cavity 1 for making a leak-proof temperature sensor includes a sensor cavity 2, a first sealing cavity 6 and a second sealing cavity 5 connected sequentially from bottom to top. The inner wall of the first sealing cavity 6 is provided with a first injection hole 4 that penetrates the wall and communicates with the outside. The inner wall of the second sealing cavity 5 is provided with a second injection hole 3 that penetrates the wall and communicates with the outside.

[0032] (2) Place the sensor element inside the sensor cavity 2;

[0033] (3) such as Figure 2 As shown, the leak-proof temperature sensor is placed vertically, and the first sealing material is injected under pressure through the first injection hole 4 until the injected material overflows from the first injection hole 4.

[0034] (4) such as Figure 3 As shown, the leak-proof temperature sensor is placed horizontally, and the second sealing material is injected under pressure through the second injection hole 3 until the injected material fills half the depth of the second injection hole 3.

[0035] In summary, this invention effectively improves the long-term protection and leak-proof function of the sensor by dividing the leak-proof temperature sensor cavity into three regions: a sensor cavity, a first sealing cavity, and a second sealing cavity, and by injecting different sealing materials into the first sealing cavity and the second sealing cavity respectively.

Claims

1. A leak-proof temperature sensor, characterized by, The cavity comprises sensor cavity, first sealing cavity and second sealing cavity from bottom to top; the sensor cavity is used for placing sensor element; the first sealing cavity is conical table structure, and the inner wall is provided with first injection hole for injecting first sealing material; the first injection hole penetrates wall and communicates with outside; the lower part of the first injection hole is provided with fixing groove for fixing the first sealing material; the first sealing material is high molecular static sealing material; the inner wall of the second sealing cavity is provided with second injection hole for injecting second sealing material; the second injection hole penetrates wall and communicates with outside; the second sealing material is epoxy resin sealing adhesive.

2. The leak resistant temperature sensor of claim 1, wherein, The fixing groove is annular groove.

3. The leak resistant temperature sensor of claim 2, wherein, The groove width of the fixing groove is 6-10mm, and the taper of the fixing groove is 45-60°.

4. The leak resistant temperature sensor of claim 1, wherein, The second sealing cavity is cylindrical structure.

5. The leak resistant temperature sensor of claim 1, wherein, The first sealing material is soft sealing material, and the second sealing material is hard sealing material.

6. The leak resistant temperature sensor of claim 1, wherein, The density of the high polymer static sealing material is 1.65-1.75 at 20℃ The density of the epoxy resin sealing adhesive is 1.35 at 25℃ ​ 7. The leak resistant temperature sensor of claim 1, wherein, The aperture of the first injection hole is φ3-4mm, and the aperture of the second injection hole is φ3-4mm.

8. A method of making a leak resistant temperature sensor as claimed in any one of claims 1 to 7, characterised by, The cavity comprises sensor cavity, first sealing cavity and second sealing cavity from bottom to top; the sensor cavity is used for placing sensor element; the first sealing cavity is conical table structure, and the inner wall is provided with first injection hole for injecting first sealing material; the first injection hole penetrates wall and communicates with outside; the lower part of the first injection hole is provided with fixing groove for fixing the first sealing material; the first sealing material is high molecular static sealing material; the inner wall of the second sealing cavity is provided with second injection hole for injecting second sealing material; the second injection hole penetrates wall and communicates with outside; the second sealing material is epoxy resin sealing adhesive. The fixing groove is annular groove. The groove width of the fixing groove is 6-10mm, and the taper of the fixing groove is 45-60°. The second sealing cavity is cylindrical structure. The first sealing material is soft sealing material, and the second sealing material is hard sealing material. The aperture of the first injection hole is φ3-4mm, and the aperture of the second injection hole is φ3-4mm. The cavity comprises sensor cavity, first sealing cavity and second sealing cavity from bottom to top; the sensor cavity is used for placing sensor element; the first sealing cavity is conical table structure, and the inner wall is provided with first injection hole for injecting first sealing material; the first injection hole penetrates wall and communicates with outside; the lower part of the first injection hole is provided with fixing groove for fixing the first sealing material; the first sealing material is high molecular static sealing material; the inner wall of the second sealing cavity is provided with second injection hole for injecting second sealing material; the second injection hole penetrates wall and communicates with outside; the second sealing material is epoxy resin sealing adhesive. The fixing groove is annular groove. The groove width of the fixing groove is 6-10mm, and the taper of the fixing groove is 45-60°. The second sealing cavity is cylindrical structure. The first sealing material is soft sealing material, and the second sealing material is hard sealing material. The aperture of the first injection hole is φ3-4mm, and the aperture of the second injection hole is φ3-4mm.

Images