阅读说明：本技术 一种具有抗热应力功能的压力传感器 (Pressure sensor with thermal stress resistance function ) 是由 杨军 王小平 曹万 于 2019-11-08 设计创作，主要内容包括：本发明涉及压力传感器技术领域,且公开了一种具有抗热应力功能的压力传感器,包括壳体、管道、固定组件、压力敏感元件和电气接头,所述管道和电气接头均连接在壳体上,所述固定组件连接在壳体的内部,所述压力敏感元件连接在固定组件的内部。该具有抗热应力功能的压力传感器,通过封闭块和弹性套的配合使用,封闭块和弹性套通过其内部填充的粘结剂将压力敏感元件固定在方块的内部,在低温的情况下,与压力敏感元件相比,粘结剂收缩,弹性套被拉伸吸收应力,在高温度情况下,与压力敏感元件相比,粘结剂膨胀,弹性套被压缩发生形变,吸收应力,避免温度变化产生的应力对压力敏感元件的精度产生影响,实现了抗热应力的目的。(The invention relates to the technical field of pressure sensors and discloses a pressure sensor with a thermal stress resistance function. The pressure sensor with the thermal stress resistance function is characterized in that the sealing block and the elastic sleeve are matched for use, the sealing block and the elastic sleeve fix the pressure sensitive element in the square through the adhesive filled in the sealing block and the elastic sleeve, the adhesive contracts and the elastic sleeve is stretched to absorb stress under the condition of low temperature, and the adhesive expands and the elastic sleeve is compressed to deform and absorb stress under the condition of high temperature compared with the pressure sensitive element, so that the stress generated by temperature change is prevented from influencing the precision of the pressure sensitive element, and the purpose of resisting thermal stress is achieved.)

1. The pressure sensor with the thermal stress resistance function is characterized by comprising a shell (1), a pipeline (2), a fixing component, a pressure sensitive element (12) and an electric joint (3), wherein the pipeline (2) and the electric joint (3) are both connected to the shell (1), the fixing component is connected to the inside of the shell (1), and the pressure sensitive element (12) is connected to the inside of the fixing component;

the fixing assembly comprises a square block (6), a sealing block (13) is connected to the inside of the square block (6), an elastic sleeve (10) is connected to the sealing block (13), a space formed by the elastic sleeve (10) and the sealing block (13) in a closed mode is filled with an adhesive (11), and the elastic sleeve (10) and the sealing block (13) are connected with a pressure sensitive element (12) through the adhesive (11).

2. The pressure sensor having a function of resisting thermal stress according to claim 1, wherein: 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 formed in the clamping ring (1303), and the inner walls of the T-shaped cylinder (1301) and the clamping ring (1303) are rough surfaces.

3. The pressure sensor having a function of resisting thermal stress according to claim 1, wherein: and a glue injection port (9) is connected to the square block (6), and a cover cap (7) is connected to the glue injection port (9) and used for sealing.

4. The pressure sensor having a function of resisting thermal stress according to claim 1, wherein: round grooves are also formed in the square block (6) and the elastic sleeve (10) and used for introducing the adhesive (11).

5. The pressure sensor having a function of resisting thermal stress according to claim 1, wherein: one end of the pressure sensitive element (12) is connected with a pin (8) and a stabilizing block (15), and the other end of the pressure sensitive element (12) is connected with a baffle plate (14).

6. The pressure sensor having a function of resisting thermal stress according to claim 5, wherein: the stabilizing block (15) comprises a square strip (1501) and side edges (1502), wherein the side edges (1502) are connected to two sides of the square strip (1501) and used for increasing the contact area with the adhesive (11).

7. The pressure sensor having a function of resisting thermal stress according to claim 1, wherein: the shell (1) further comprises a plurality of first connecting columns (5), and the first connecting columns (5) are used for being connected with the electrical connectors (3).

8. The pressure sensor having a function of resisting thermal stress according to claim 1, wherein: the electrical connector (3) further comprises a second connecting column (4), and the second connecting column (4) is matched with the first connecting column (5).

Technical Field

The invention relates to the technical field of pressure sensors, in particular to a pressure sensor with a thermal stress resistance function.

Background

The pressure sensor is a device or a device which can sense pressure signals and can convert the pressure signals into usable output electric signals according to a certain rule, is usually composed of a pressure sensitive element and a signal processing unit, is the most common sensor in industrial practice, is widely applied to various industrial automatic control environments and relates to various industries such as water conservancy and hydropower, railway traffic, intelligent buildings, production automatic control, aerospace, war industry, petrifaction, oil wells, electric power, ships, machine tools, pipelines and the like.

In the conventional pressure sensor, a pressure detecting element is fixed inside the sensor by an adhesive, when the ambient temperature changes, thermal stress is generated due to the difference of the linear expansion coefficients of the pressure detecting element and the adhesive, when the temperature decreases, the adhesive contracts compared with the pressure detecting element, and when the ambient temperature increases, the adhesive expands compared with the pressure detecting element, and heat stress is generated, and the pressure detecting element deforms, and the output characteristic of the pressure detecting element changes, so that the accuracy of the sensor output is reduced.

Disclosure of Invention

Technical problem to be solved

Aiming at the defects of the prior art, the invention provides the pressure sensor with the thermal stress resistance function, which has the advantages of thermal stress resistance and the like, and solves the problem that the output precision is influenced by the thermal stress generated by the difference of the linear expansion coefficients of the pressure detection element and the adhesive due to the change of the ambient temperature of the conventional pressure sensor.

(II) technical scheme

In order to achieve the aim of resisting thermal stress, the invention provides the following technical scheme: a pressure sensor with a thermal stress resistance function comprises a shell, a pipeline, a fixing component, a pressure sensitive element and an electric joint, wherein the pipeline and the electric joint are connected to the shell, the fixing component is connected to the inside of the shell, and the pressure sensitive element is connected to the inside of the fixing component;

the fixing assembly comprises a square block, a sealing block is connected inside the square block, an elastic sleeve is connected onto the sealing block, an adhesive is filled in a space formed by the elastic sleeve and the sealing block in a closed mode, and the elastic sleeve and the sealing block are connected through the adhesive and a pressure sensitive element.

Preferably, the sealing 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 formed in the clamping ring, and the inner walls of the T-shaped cylinder and the clamping ring are rough surfaces.

Preferably, the square block is connected with a glue injection port, and the glue injection port is connected with a cover cap for sealing.

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

Preferably, one end of the pressure sensitive element is connected with a pin and a stabilizing block, and the other end of the pressure sensitive element is connected with a baffle plate.

Preferably, the stabilizing block comprises a square bar and side edges, and the side edges are connected to two sides of the square bar and used for increasing the contact area with the adhesive.

Preferably, the housing further comprises a plurality of first connecting posts for connecting the electrical connectors.

Preferably, the electrical connector further comprises a second connecting column, and the second connecting column is matched with the first connecting column.

(III) advantageous effects

Compared with the prior art, the invention provides the pressure sensor with the thermal stress resistance function, which has the following beneficial effects:

1. the pressure sensor with the thermal stress resistance function is characterized in that the sealing block and the elastic sleeve are matched for use, the sealing block and the elastic sleeve fix the pressure sensitive element in the square through the adhesive filled in the sealing block and the elastic sleeve, the adhesive contracts and the elastic sleeve is stretched to absorb stress under the condition of low temperature, and the adhesive expands and the elastic sleeve is compressed to deform and absorb stress under the condition of high temperature compared with the pressure sensitive element, so that the stress generated by temperature change is prevented from influencing the precision of the pressure sensitive element, and the purpose of resisting thermal stress is achieved.

2. According to the pressure sensor with the thermal stress resistance function, the cap and the glue injection port are matched for use, when the pressure sensitive element is fixed, the adhesive enters from the glue injection port, the pressure sensitive element is fixed and sealed, water and other impurities are prevented from entering, the contact area between the stable block and the adhesive is increased through the use of the stable block, the pressure sensitive element is connected more stably, and the purpose of facilitating fixing is achieved.

Drawings

Fig. 1 is a schematic structural diagram of a pressure sensor with thermal stress resistance according to the present invention.

Fig. 2 is a schematic structural diagram of a fixing assembly in a pressure sensor with thermal stress resistance according to the present invention.

Fig. 3 is a schematic structural diagram of a sealing block in a pressure sensor with thermal stress resistance according to the present invention.

Fig. 4 is a schematic structural diagram of a stabilizing block in the pressure sensor with thermal stress resistance according to the present invention.

In the figure: the device comprises a shell 1, a pipeline 2, an electrical connector 3, a second connecting column 4, a first connecting column 5, a square block 6, a cap 7, pins 8, a glue injection port 9, an elastic sleeve 10, an adhesive 11, a pressure sensitive element 12, a sealing block 13, a T-shaped cylinder 1301, a circular ring 1302, a clamping ring 1303, a blocking piece 14, a stabilizing block 15, a square bar 1501 and a side edge 1502.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 1-4, a pressure sensor with thermal stress resistance function comprises a shell 1, a pipeline 2, a fixing component, a pressure sensitive element 12 and an electrical connector 3, wherein the shell 1 further comprises a plurality of first connecting columns 5, the first connecting columns 5 are used for connecting the electrical connector 3, the electrical connector 3 further comprises second connecting columns 4, the second connecting columns 4 are matched with the first connecting columns 5 and are connected into a whole through screws, the pipeline 2 and the electrical connector 3 are both connected to the shell 1 and are used for introducing a detected fluid, the fixing component is connected inside the shell 1, and the pressure sensitive element 12 is connected inside the fixing component;

the fixing component comprises a square 6, a glue injection port 9 is connected to the square 6, a cover cap 7 is connected to the glue injection port 9, the cover cap 7 and the glue injection port 9 can be in threaded connection and used for sealing to prevent an adhesive 11 from leaking, a sealing block 13 is connected to the inside of the square 6, 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 formed in 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, the T-shaped cylinder 1301 and the clamping ring 1303 can be detached in combination, the pressure sensitive element 12 can be conveniently installed, an elastic sleeve 10 is connected to the sealing block 13, the elastic sleeve 10 is made of elastic materials with good toughness, circular grooves are formed in the square 6 and the elastic sleeve 10 and the sealing block 13 and filled with the adhesive 11, the elastic sleeve 10 and the sealing block 13 are connected with the pressure sensitive element 12 through the adhesive 11, water is prevented from affecting the pressure sensitive element 12, one end of the pressure sensitive element 12 is connected with the pin 8 and the stabilizing block 15, the other end of the pressure sensitive element 12 is connected with the blocking piece 14, the blocking piece 14 is used for preventing the adhesive 11 from leaking, the stabilizing block 15 comprises a square bar 1501 and side edges 1502, the side edges 1502 are connected to two sides of the square bar 1501 and used for increasing the contact area with the adhesive 11, and the pressure sensitive element 12 is connected more stably.

When in use:

(1) under the condition of low temperature, compared with the pressure sensitive element 12, the adhesive 11 contracts, the elastic sleeve 10 is stretched to absorb stress, and under the condition of high temperature, compared with the pressure sensitive element 12, the adhesive 11 expands, the elastic sleeve 10 is compressed to deform, the stress is absorbed, and the influence of the stress generated by temperature change on the precision of the pressure sensitive element 12 is avoided.

(2) When the pressure sensitive element 12 is fixed, the pressure sensitive element 12 is placed inside the block 6 by 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.

The pressure sensor with the thermal stress resistance function is characterized in that the sealing block 13 and the elastic sleeve 10 are matched for use, the sealing block 13 and the elastic sleeve 10 fix the pressure sensitive element 12 in the square 6 through the adhesive 11 filled in the sealing block 13 and the elastic sleeve 10, the adhesive 11 contracts and the elastic sleeve 10 is stretched to absorb stress under the condition of low temperature, and the adhesive 11 expands and the elastic sleeve 10 is compressed to deform and absorb stress under the condition of high temperature compared with the pressure sensitive element 12, so that the stress generated by temperature change is prevented from influencing the precision of the pressure sensitive element 12, the thermal stress resistance purpose is realized, and the problems that the thermal stress is generated due to the difference of linear expansion coefficients of the pressure detection element and the adhesive 11 and the output precision is influenced due to the change of ambient temperature of the existing pressure sensor are solved.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.