A pressure sensor with thermal stress resistance

Abstract

The present invention relates to the technical field of pressure sensors, and discloses a pressure sensor with anti-thermal stress function, comprising a shell, a pipe, a fixing assembly, a pressure sensitive element and an electrical connector, wherein the pipe and the electrical connector are both connected to the shell, the fixing assembly is connected to the inside of the shell, and the pressure sensitive element is connected to the inside of the fixing assembly. The pressure sensor with anti-thermal stress function uses a closed block and an elastic sleeve in combination, and the closed block and the elastic sleeve fix the pressure sensitive element inside the block through an adhesive filled inside the closed block and the elastic sleeve. Under low temperature conditions, compared with the pressure sensitive element, the adhesive shrinks, and the elastic sleeve is stretched to absorb stress. Under high temperature conditions, compared with the pressure sensitive element, the adhesive expands, and the elastic sleeve is compressed and deformed to absorb stress, thereby avoiding the stress caused by temperature changes from affecting the accuracy of the pressure sensitive element, and achieving the purpose of anti-thermal stress.

Description

Technical Field

[0001] The present invention relates to the technical field of pressure sensors, in particular to a pressure sensor with a thermal stress resistance function. Background Art

[0002] A pressure sensor is a device or apparatus that can sense pressure signals and convert them into usable output electrical signals according to certain rules. A pressure sensor is usually composed of a pressure sensitive element and a signal processing unit. It is the most commonly used sensor in industrial practice. It is widely used in various industrial automatic control environments, involving water conservancy and hydropower, railway transportation, intelligent buildings, production automatic control, aerospace, military industry, petrochemical, oil wells, electric power, ships, machine tools, pipelines and many other industries.

[0003] In the existing pressure sensor, the pressure detection element is fixed inside the sensor by adhesive. If the ambient temperature changes, thermal stress is generated due to the difference in linear expansion coefficients of the pressure detection element and the adhesive. When the temperature drops, the adhesive shrinks compared to the pressure detection element, and when the ambient temperature rises, the adhesive expands compared to the pressure detection element, resulting in thermal stress. The pressure detection element is deformed and the output characteristics of the pressure detection element are changed, thereby reducing the accuracy of the sensor output. Therefore, a pressure sensor with anti-thermal stress function is proposed to solve the above-mentioned problems. Summary of the invention

[0004] 1. Technical issues to be resolved

[0005] In view of the deficiencies in the prior art, the present invention provides a pressure sensor with anti-thermal stress function, which has the advantages of anti-thermal stress, etc., and solves the problem that the existing pressure sensor generates thermal stress due to the difference in linear expansion coefficients between the pressure detection element and the adhesive due to changes in ambient temperature, thereby affecting the output accuracy.

[0006] (II) Technical solution

[0007] In order to achieve the above-mentioned purpose of thermal stress resistance, the present invention provides the following technical solution: a pressure sensor with thermal stress resistance function, comprising a housing, a pipe, a fixing assembly, a pressure sensitive element and an electrical connector, wherein the pipe and the electrical connector are both connected to the housing, the fixing assembly is connected to the inside of the housing, and the pressure sensitive element is connected to the inside of the fixing assembly;

[0008] The fixing assembly includes a block, a closing block is connected to the inside of the block, an elastic sleeve is connected to the closing block, a space formed by the elastic sleeve and the closing block is filled with adhesive, and the elastic sleeve and the closing block are connected via the adhesive and a pressure sensitive element.

[0009] Preferably, the closing block comprises a T-shaped cylinder, a circular ring is connected to the T-shaped cylinder, a clamping ring is connected between the T-shaped cylinder and the circular ring, a clamping groove is provided on the clamping ring, and the inner walls of the T-shaped cylinder and the clamping ring are both rough surfaces.

[0010] Preferably, the block is connected with a glue injection port, and the glue injection port is connected with a cap for sealing.

[0011] Preferably, the block and the elastic sleeve are also provided with circular grooves for introducing adhesive.

[0012] Preferably, one end of the pressure sensitive element is connected to a pin and a stabilizing block, and the other end of the pressure sensitive element is connected to a blocking piece.

[0013] Preferably, the stabilizing block comprises a square bar and side edges, wherein the side edges are connected to two sides of the square bar to increase the contact area with the adhesive.

[0014] Preferably, the housing further comprises a plurality of first connecting posts, and the first connecting posts are used to connect the electrical connector.

[0015] Preferably, the electrical connector further comprises a second connecting post, and the second connecting post matches the first connecting post.

[0016] (III) Beneficial effects

[0017] Compared with the prior art, the present invention provides a pressure sensor with anti-thermal stress function, which has the following beneficial effects:

[0018] 1. The pressure sensor with anti-thermal stress function is used in conjunction with a closing block and an elastic sleeve. The closing block and the elastic sleeve fix the pressure sensitive element inside the block through an adhesive filled inside. Under low temperature conditions, compared with the pressure sensitive element, the adhesive shrinks, and the elastic sleeve is stretched to absorb stress. Under high temperature conditions, compared with the pressure sensitive element, the adhesive expands, and the elastic sleeve is compressed and deformed to absorb stress, thereby avoiding the stress caused by temperature changes from affecting the accuracy of the pressure sensitive element, thereby achieving the purpose of anti-thermal stress.

[0019] 2. The pressure sensor with anti-thermal stress function is used in conjunction with the cover cap and the glue injection port. When fixing the pressure sensitive element, the adhesive enters from the glue injection port to fix and seal the pressure sensitive element and prevent water and other impurities from entering. By using the stabilizing block, the stabilizing block increases the contact area with the adhesive, making the connection of the pressure sensitive element more stable, thereby achieving the purpose of easy fixation. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic structural diagram of a pressure sensor with anti-thermal stress function proposed by the present invention.

[0021] Figure 2 The present invention is a schematic structural diagram of a fixed component in a pressure sensor with anti-thermal stress function.

[0022] Figure 3 This is a schematic structural diagram of a sealing block in a pressure sensor with anti-thermal stress function proposed by the present invention.

[0023] Figure 4 This is a schematic structural diagram of a stabilizing block in a pressure sensor with anti-thermal stress function proposed by the present invention.

[0024] In the figure: 1 shell, 2 pipeline, 3 electrical connector, 4 second connecting column, 5 first connecting column, 6 block, 7 cap, 8 pin, 9 glue injection port, 10 elastic sleeve, 11 adhesive, 12 pressure sensitive element, 13 closing block, 1301 T-type cylinder, 1302 ring, 1303 clamping ring, 14 baffle, 15 stabilizing block, 1501 square bar, 1502 side. DETAILED DESCRIPTION

[0025] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0026] Please refer to 1-4, a pressure sensor with anti-thermal stress function, including a housing 1, a pipe 2, a fixing assembly, a pressure sensitive element 12 and an electrical connector 3, the housing 1 also includes a plurality of first connecting posts 5, the first connecting posts 5 are used to connect the electrical connector 3, the electrical connector 3 also includes a second connecting post 4, the second connecting post 4 matches the first connecting post 5, and the two are connected to form a whole by screws, the pipe 2 and the electrical connector 3 are both connected to the housing 1, and are used to pass the detected fluid, the fixing assembly is connected to the inside of the housing 1, and the pressure sensitive element 12 is connected to the inside of the fixing assembly;

[0027] The fixing component includes a block 6, which is connected to a glue injection port 9, and a cap 7 is connected to the glue injection port 9. The cap 7 and the glue injection port 9 can be threadedly connected for sealing to prevent the adhesive 11 from leaking out. The interior of the block 6 is connected to a closing block 13, and the closing block 13 includes a T-shaped cylinder 1301, and a circular ring 1302 is connected to the T-shaped cylinder 1301. A clamping ring 1303 is connected between the T-shaped cylinder 1301 and the circular ring 1302, and a clamping groove is provided on the clamping ring 1303. The inner walls of the T-shaped cylinder 1301 and the clamping ring 1303 are rough surfaces, which can increase the contact area with the adhesive 11, and the combination of the T-shaped cylinder 1301 and the clamping ring 1303 can be disassembled to facilitate the installation of the pressure sensitive element 12. The closing block 13 is connected to an elastic sleeve 10, and the elastic sleeve 10 is composed of an elastic material with good toughness. Round grooves are also provided on the square block 6 and the elastic sleeve 10 for passing an adhesive 11. The space formed by the closure of the elastic sleeve 10 and the closing block 13 is filled with the adhesive 11. The elastic sleeve 10 and the closing block 13 are connected to the pressure sensitive element 12 through the adhesive 11, and water is prevented from affecting the pressure sensitive element 12. One end of the pressure sensitive element 12 is connected to a pin 8 and a stabilizing block 15, and the other end of the pressure sensitive element 12 is connected to a baffle 14, which is used to prevent the adhesive 11 from leaking out. The stabilizing block 15 includes a square bar 1501 and a side 1502. The side 1502 is connected to both sides of the square bar 1501 to increase the contact area with the adhesive 11, so that the connection of the pressure sensitive element 12 is more stable.

[0028] When using:

[0029] (1) Under low temperature conditions, the adhesive 11 contracts compared to the pressure sensitive element 12, and the elastic sleeve 10 is stretched to absorb stress. Under high temperature conditions, the adhesive 11 expands compared to the pressure sensitive element 12, and the elastic sleeve 10 is compressed and deformed to absorb stress, thereby preventing the stress caused by temperature changes from affecting the accuracy of the pressure sensitive element 12.

[0030] (2) When fixing the pressure sensitive element 12, the pressure sensitive element 12 is placed inside the block 6 using the sealing block 13, and then the adhesive 11 is introduced from the glue injection port 9 to bond and fix the pressure sensitive element 12.

[0031] The pressure sensor with anti-thermal stress function is used in conjunction with a closing block 13 and an elastic sleeve 10. The closing block 13 and the elastic sleeve 10 fix the pressure sensitive element 12 inside the block 6 through the adhesive 11 filled inside. Under low temperature conditions, compared with the pressure sensitive element 12, the adhesive 11 shrinks, and the elastic sleeve 10 is stretched to absorb stress. Under high temperature conditions, compared with the pressure sensitive element 12, the adhesive 11 expands, and the elastic sleeve 10 is compressed and deformed to absorb stress, thereby avoiding the stress caused by temperature changes from affecting the accuracy of the pressure sensitive element 12, achieving the purpose of anti-thermal stress, and solving the problem that the existing pressure sensor generates thermal stress due to the difference in linear expansion coefficients between the pressure detection element and the adhesive 11 due to changes in ambient temperature, thereby affecting the output accuracy.

[0032] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A pressure sensor with thermal stress resistance, characterized in that : comprising a housing (1), a pipe (2), a fixing component, a pressure sensitive element (12) and an electrical connector (3), wherein the pipe (2) and the electrical connector (3) are both connected to the housing (1), the fixing component is connected to the inside of the housing (1), and the pressure sensitive element (12) is connected to the inside of the fixing component; The fixing assembly comprises a block (6), the interior of the block (6) is connected to a closing block (13), the closing block (13) is connected to an elastic sleeve (10), the space formed by the elastic sleeve (10) and the closing block (13) is filled with an adhesive (11), and the elastic sleeve (10) and the closing block (13) are connected via the adhesive (11) and a pressure sensitive element (12); The sealing block (13) comprises a T-shaped cylinder (1301), a circular ring (1302) is connected to the T-shaped cylinder (1301), a clamping ring (1303) is connected between the T-shaped cylinder (1301) and the circular ring (1302), a clamping groove is provided on the clamping ring (1303), and the inner walls of the T-shaped cylinder (1301) and the clamping ring (1303) are both rough surfaces; The block (6) is connected to a glue injection port (9), and the glue injection port (9) is connected to a cover cap (7) for sealing.

2. The pressure sensor with anti-thermal stress function according to claim 1, characterized in that: The block (6) and the elastic sleeve (10) are also provided with circular grooves for introducing adhesive (11).

3. The pressure sensor with thermal stress resistance function according to claim 1, characterized in that: One side of the pressure sensitive element (12) is connected to a pin (8) and a stabilizing block (15), and a blocking piece (14) is provided between the pressure sensitive element (12) and the closing block (13).

4. The pressure sensor with thermal stress resistance function according to claim 3, characterized in that: The stabilizing block (15) comprises a square bar (1501) and side edges (1502), wherein the side edges (1502) are connected to two sides of the square bar (1501) and are used to increase the contact area with the adhesive (11).

5. The pressure sensor with thermal stress resistance function according to claim 1, characterized in that: The housing (1) further comprises a plurality of first connecting posts (5), wherein the first connecting posts (5) are used to connect the electrical connector (3).

6. The pressure sensor with thermal stress resistance function according to claim 1, characterized in that: The electrical connector (3) further comprises a second connecting post (4), wherein the second connecting post (4) matches the first connecting post (5).

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