High-precision pressure sensor

Abstract

The high-precision pressure sensor comprises a first shell, a second shell, a transmission ejector pin and a pressure transmission block, the first shell comprises a first containing groove and a transmission part connected to one side of the first containing groove, a partition plate is arranged at the joint of the transmission part and the first containing groove, and the transmission ejector pin penetrates through the partition plate and is connected with the partition plate; the second shell comprises a second containing groove and a pressure inlet pipe, one end of the pressure inlet pipe communicates with the second containing groove, the first containing groove is connected into the second containing groove, the first containing groove and the second containing groove jointly define a containing cavity, the pressure transmission block is arranged in the containing cavity, one end of the transmission ejector pin extends into the containing cavity and abuts against the pressure transmission block, and the other end of the transmission ejector pin abuts against the pressure transmission block. A spacer is arranged in the second containing groove and clamped between the inner bottom wall of the second containing groove and the pressure transmission block. The pressure sensor has the effects of improving the measurement precision of the pressure sensor and prolonging the service life of the pressure sensor.

Description

Technical Field

[0001] The present application relates to the technical field of pressure sensors, and in particular to a high-precision pressure sensor. 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. Pressure sensors are usually composed of pressure sensitive elements and signal processing units. According to different test pressure types, pressure sensors can be divided into gauge pressure sensors, differential pressure sensors and absolute pressure sensors. Pressure sensors are widely used in various industrial automatic control environments, involving water conservancy and hydropower, railway transportation, intelligent buildings, production automatic control, oil wells, electricity, ships, machine tools, pipelines and many other fields.

[0003] When in use, one end of the pressure sensor is connected to the pressure inlet. The gas enters the pressure sensor through the pressure inlet and contacts the pressure sensitive element. The other side of the pressure sensitive element is provided with an output end, which is connected to an external data processing module. The pressure sensitive element receives the pressure signal and transmits it to the output end on the other side, and the output end transmits the signal to the data processing module for processing and analysis.

[0004] With respect to the above-mentioned related technologies, the inventor believes that during the actual use of the pressure sensor, one side of the pressure sensitive element is in contact with the gas, and a small amount of moisture contained in the gas is in contact with the pressure sensitive element at the same time. When the moisture is too cold or the temperature difference between the moisture and the pressure sensitive element is large, the side of the pressure sensitive element in contact with it is prone to frost, which may cause the pressure sensitive element to adhere to the shell, thereby affecting the measurement accuracy of the pressure sensor. In addition, the frost condensed on the surface of the pressure sensitive element will damage the structure of the pressure sensor and shorten the service life of the pressure sensor. Utility Model Content

[0005] In order to improve the measurement accuracy of the pressure sensor and extend the service life of the pressure sensor, the present application provides a high-precision pressure sensor.

[0006] The high-precision pressure sensor provided in this application adopts the following technical solution:

[0007] A high-precision pressure sensor comprises a first shell, a second shell, a transmission ejector pin and a pressure transmission block, wherein the first shell comprises a first accommodating groove and a transmission part connected to one side thereof, a partition is provided at the connection between the transmission part and the first accommodating groove, the transmission ejector pin penetrates the partition and is connected thereto, the second shell comprises a second accommodating groove and a pressure inlet pipe, one end of the pressure inlet pipe is communicated with the second accommodating groove, the first accommodating groove is connected to the second accommodating groove, the first accommodating groove and the second accommodating groove together form an accommodating cavity, the pressure transmission block is arranged in the accommodating cavity, one end of the transmission ejector pin extends into the accommodating cavity and abuts against the pressure transmission block, a diaphragm is provided in the second accommodating groove, and the diaphragm is sandwiched between the inner bottom wall of the second accommodating groove and the pressure transmission block.

[0008] By adopting the above technical solution, the gas enters the pressure inlet pipe and contacts the diaphragm, the diaphragm transmits the pressure to the pressure transmission block, the pressure transmission block transmits the pressure to the transmission ejector pin, and the transmission ejector pin transmits the signal to the data processing module for processing and analysis. The setting of the diaphragm prevents the pressure transmission block from directly contacting the small amount of liquid contained in the gas, thereby avoiding frost on the surface of the pressure transmission block due to temperature difference. Through the mutual cooperation of the first shell, the second shell, the transmission ejector pin, the pressure transmission block and the diaphragm, the possibility of frost on the surface of the pressure transmission block in contact with the liquid is reduced, which has the effect of improving the measurement accuracy of the pressure sensor and extending the service life of the pressure sensor.

[0009] Optionally, a sealing ring is provided in the second containing groove, and the sealing ring is arranged on a side of the spacer close to the top pressure inlet pipe, and the outer diameter of the sealing ring is equal to the inner diameter of the second containing groove.

[0010] By adopting the above technical solution, the sealing ring is arranged between the diaphragm and the inner bottom wall of the second containing groove, which reduces the possibility of liquid flowing into the containing cavity through the gap between the diaphragm and the second containing groove, and reduces the possibility of corrosion caused by contact between the various components in the containing cavity and the liquid.

[0011] Optionally, a plurality of the transmission ejectors are arranged in parallel, and the plurality of the transmission ejectors pass through the partition plate and extend into the first accommodating groove.

[0012] By adopting the above technical solution, multiple transmission tops measure the pressure of the pressure transmission block at the same time, and the measured data is integrated and processed, which helps to improve the measurement accuracy of the pressure sensor.

[0013] Optionally, a gap is left between the inner bottom wall of the first accommodating groove and the pressure transmission block, and a transmission spring is provided in the first accommodating groove, the transmission spring includes an abutting portion and an elastic portion connected thereto, the abutting portion is connected to the transmission ejector pin, and the elastic portion extends toward the direction of the pressure transmission block and abuts therewith.

[0014] By adopting the above technical solution, the contact part of the transmission spring is connected to the transmission ejector pin, and the elastic part of the transmission spring is pressed against the pressure transmission block, so that the pressure transmission block is pressed against the bottom wall of the second receiving groove, which helps to improve the measurement accuracy of the pressure sensor. At the same time, it is also convenient to directly transmit the pressure received by the pressure transmission block to the transmission ejector pin for output.

[0015] Optionally, a limiting column is provided on the inner bottom wall of the first accommodating groove, a limiting hole corresponding to the limiting column is opened on the abutting portion, and the limiting column passes through the limiting hole.

[0016] By adopting the above technical solution, the limiting column passes through the limiting hole on the abutting part, thereby limiting the transmission spring piece and reducing the possibility of the transmission spring piece shaking in the accommodating cavity.

[0017] Optionally, a limiting ring groove is provided on the inner bottom wall of the second accommodating groove, the limiting ring groove is coaxially connected to the pressure inlet pipe, a connecting ring body is coaxially provided on the side of the limiting ring close to the pressure inlet pipe, and the connecting ring body is embedded in the limiting ring groove.

[0018] By adopting the above technical solution, the connecting ring body is embedded in the limiting ring groove in the second accommodating groove, ensuring that the sealing ring does not deviate in the second accommodating groove and is coaxially arranged with the inner cavity of the pressure inlet pipe, thereby improving the structural stability of the sealing ring.

[0019] Optionally, a clamping ring body is provided on one side of the sealing ring close to the diaphragm, the clamping ring body is coaxially arranged with the sealing ring, and the clamping ring body is clamped against the diaphragm.

[0020] By adopting the above technical solution, the tightening ring presses the diaphragm so that it fits tightly against the surface of the pressure transmission block. On the one hand, the possibility of liquid seeping into the receiving groove is reduced. On the other hand, the diaphragm fully fits against the surface of the pressure transmission block, which can accurately transmit the pressure to the pressure transmission block, thereby helping to improve the measurement accuracy of the sensor.

[0021] In summary, the present application includes at least one of the following beneficial technical effects:

[0022] 1. The mutual cooperation of the first shell, the second shell, the transmission ejector pin, the pressure transmission block and the diaphragm reduces the possibility of frost on the surface of the pressure transmission block, which has the effect of improving the measurement accuracy of the pressure sensor and extending the service life of the pressure sensor; 2. The setting of the sealing ring reduces the possibility of a small amount of liquid flowing into the accommodating cavity through the gap between the diaphragm and the second accommodating groove, and reduces the possibility of corrosion caused by contact between the various components in the accommodating cavity and the liquid;

[0023] 3. The setting of the limiting column realizes the limiting of the transmission spring piece, reducing the possibility of the transmission spring piece shaking in the accommodating cavity. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a structural schematic diagram of a high-precision pressure sensor used in an embodiment of the present application.

[0025] Figure 2 It is a partial cross-sectional view used to reflect the internal structure of the first shell and the second shell in the embodiment of the present application.

[0026] Figure 3 yes Figure 2 Enlarged view of part A in the middle.

[0027] Explanation of the reference numerals: 1. first shell; 101. transmission part; 102. first accommodating groove; 103. partition; 104. limiting boss; 105. fixing boss; 2. second shell; 21. second accommodating groove; 22. pressure inlet pipe; 23. limiting ring groove; 3. pressure transmission block; 4. riveted ring cover; 5. partition; 6. transmission ejector pin; 7. sealing ring; 71. abutting ring body; 72. connecting ring body; 8. transmission spring piece; 81. abutting part; 82. elastic part; 83. limiting hole; 9. limiting column. DETAILED DESCRIPTION

[0028] The following is combined with Figure 1-3 The present application is further described in detail. The embodiment of the present application provides a high-precision pressure sensor, which has the effect of improving the measurement accuracy of the pressure sensor and extending the service life of the pressure sensor.

[0029] Reference Figure 1 and Figure 2A high-precision pressure sensor includes a first shell 1, a second shell 2, a pressure transmission block 3, a riveted ring cover 4 and a spacer 5. The first shell 1 includes a transmission part 101 and a first receiving groove 102. The first receiving groove 102 is fixedly connected to one end of the transmission part 101, and the first receiving groove 102 is open on the side away from the transmission part 101. The transmission part 101 is hollow, and a partition 103 is fixedly connected at the connection between the transmission part 101 and the first receiving groove 102. The partition 103 separates the transmission part 101 from the inner cavity of the first receiving groove 102. A plurality of transmission ejectors 6 are arranged in parallel in the first shell 1, and the transmission ejectors 6 penetrate the partition 103 and are fixedly connected to it. A limiting boss 104 is arranged along the outer peripheral wall at the connection between the first receiving groove 102 and the transmission part 101.

[0030] Reference Figure 2 The second housing 2 includes a second receiving groove 21 and a pressure inlet pipe 22. The inner cavity of the pressure inlet pipe 22 is coaxial with the inner cavity of the second receiving groove 21 and is connected. The inner diameter of the second receiving groove 21 is equal to the outer diameter of the first receiving groove 102. An internal thread is provided on the inner ring wall of the second receiving groove 21 away from the pressure inlet pipe 22. The first receiving groove 102 is provided in the second receiving groove 21. The first receiving groove 102 and the second receiving groove 21 together form a receiving cavity.

[0031] Reference Figure 2 The pressure transmission block 3 is arranged in the accommodating cavity, and a fixing boss 105 corresponding to the pressure transmission block 3 is provided on the inner ring wall of the first accommodating groove 102 away from the transmission part 101, and the pressure transmission block 3 is arranged in the fixing boss 105. The diaphragm 5 is arranged on the side of the pressure transmission block 3 close to the inner bottom wall of the second accommodating groove 21, and the diameter of the diaphragm 5 is equal to the inner diameter of the second accommodating groove 21. The diaphragm 5 in this embodiment is made of polyimide material.

[0032] Reference Figure 2-3 , a sealing ring 7 is arranged in the second receiving groove 21, the outer diameter of the sealing ring 7 is equal to the inner diameter of the second receiving groove 21, and the sealing ring 7 is sandwiched between the diaphragm 5 and the inner bottom wall of the second receiving groove 21. A tightening ring body 71 is coaxially arranged on the side of the sealing ring 7 close to the diaphragm 5, and a connecting ring body 72 is coaxially arranged on the side of the sealing ring 7 away from the diaphragm 5. A limiting ring groove 23 corresponding to the connecting ring body 72 is coaxially opened on the inner bottom wall of the second receiving groove 21, and the connecting ring body 72 is embedded in the limiting ring groove 23, and the tightening ring body 71 presses the diaphragm 5 against the pressure transmission block 3.

[0033] Reference Figure 2 and Figure 3, the pressure transmission block 3 is spaced apart from the inner top wall of the first receiving groove 102, and one end of the transmission ejector pin 6 extends into the receiving cavity. A transmission spring piece 8 is arranged in the receiving cavity, and the transmission spring piece 8 includes an abutting portion 81 and an elastic portion 82. The abutting portion 81 is welded with the transmission ejector pin 6, and a limiting column 9 is fixedly connected to the inner top wall of the first receiving groove 102. A limiting hole 83 corresponding to the limiting column 9 is provided on the abutting portion 81, and the limiting column 9 passes through the abutting portion 81 through the limiting hole 83. The elastic portion 82 is arranged in an S shape, and one end of the elastic portion 82 is connected to the abutting portion 81, and the other end is tightly abutted against the pressure transmission block 3.

[0034] Reference Figure 2 When measuring the pressure, the gas flows into the pressure inlet pipe 22. The diaphragm 5 is made of polyimide material, which has excellent mechanical properties and tensile strength. It can maintain stable performance even in extremely low and high temperature environments. Therefore, the gas pressure can be accurately transmitted to the pressure transmission block 3. The pressure transmission block 3 transmits the pressure to a plurality of transmission pins 6 through the transmission spring 8. The plurality of transmission pins 6 simultaneously transmit the signal to the data processing module for analysis, which helps to improve the measurement accuracy of the pressure sensor. Since the diaphragm 5 separates the small amount of liquid contained in the gas to be measured from the pressure transmission block 3, the possibility of frost on the surface of the pressure transmission block 3 due to the temperature difference is reduced, which helps to improve the measurement accuracy of the sensor and extend its service life.

[0035] Reference Figure 2-3 , the connecting ring body 72 is embedded in the limiting ring groove 23, so that the sealing ring 7 can remain coaxial with the pressure inlet pipe 22, improving the structural stability of the sealing ring 7 in the second receiving groove 21. The tightening ring body 71 presses the diaphragm 5 against the pressure transmission block 3, so that the diaphragm 5 can fit with the pressure transmission block 3 and accurately transmit the pressure to the pressure transmission block 3. In addition, the possibility of the liquid in the pressure inlet pipe 22 flowing into the receiving cavity is also reduced. The riveted ring cover 4 is pressed against the outside of the first shell 1 by riveting, thereby realizing the connection between the first shell 1 and the second shell 2.

[0036] Reference Figure 2 and Figure 3 The limiting column 9 limits the transmission spring piece 8 by limiting the position, reducing the possibility of the transmission spring piece 8 shaking in the accommodating cavity. The elastic part 82 of the transmission spring piece 8 is pressed against the pressure transmission block 3, so that the pressure transmission block 3 can be closely fitted with the diaphragm 5, so that the pressure on the pressure transmission block 3 can be directly transmitted to the transmission ejector pin 6 through the transmission spring piece 3, and the temperature and pressure of the pressure transmission block 3 are measured at the same time.

[0037] The implementation principle of a high-precision pressure sensor in the embodiment of the present application is as follows: when measuring the pressure, the gas flows into the pressure inlet pipe 22. The diaphragm 5 is made of polyimide material, which has excellent mechanical properties and tensile strength, and can maintain stable performance even in extremely low and high temperature environments. Therefore, the pressure of the gas can be accurately transmitted to the pressure transmission block 3, and the pressure transmission block 3 transmits the pressure to a plurality of transmission pins 6 through the transmission spring 8. The plurality of transmission pins 6 simultaneously transmit the signal to the data processing module for analysis, which helps to improve the measurement accuracy of the pressure sensor. Since the diaphragm 5 separates the small amount of liquid contained in the gas to be measured from the pressure transmission block 3, the possibility of frost on the surface of the pressure transmission block 3 due to the temperature difference is reduced, which helps to improve the measurement accuracy of the sensor and extend its service life.

[0038] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A high-precision pressure sensor, characterized in that: The invention comprises a first shell (1), a second shell (2), a transmission ejector pin (6) and a pressure transmission block (3), wherein the first shell (1) comprises a first receiving groove (102) and a transmission part (101) connected to one side thereof, a partition plate (103) is provided at the connection between the transmission part (101) and the first receiving groove (102), the transmission ejector pin (6) passes through the partition plate (103) and is connected thereto, the second shell (2) comprises a second receiving groove (21) and a pressure inlet pipe (22), one end of the pressure inlet pipe (22) is connected to the second receiving groove (21), and the pressure inlet pipe (22) is connected to the second receiving groove (21). The first receiving groove (102) is connected to the second receiving groove (21), the first receiving groove (102) and the second receiving groove (21) together form a receiving cavity, the pressure transmission block (3) is arranged in the receiving cavity, one end of the transmission ejector pin (6) extends into the receiving cavity and abuts against the pressure transmission block (3), and a spacer (5) is arranged in the second receiving groove (21), and the spacer (5) is sandwiched between the inner bottom wall of the second receiving groove (21) and the pressure transmission block (3).

2. A high-precision pressure sensor according to claim 1, characterized in that: A sealing ring (7) is provided in the second containing groove (21); the sealing ring (7) is provided on a side of the spacer (5) close to the top pressure inlet pipe (22); and the outer diameter of the sealing ring (7) is equal to the inner diameter of the second containing groove (21).

3. A high-precision pressure sensor according to claim 1, characterized in that: A plurality of the transmission ejector pins (6) are arranged in parallel, and the plurality of the transmission ejector pins (6) pass through the partition plate (103) and extend into the first containing groove (102).

4. A high-precision pressure sensor according to claim 1, characterized in that: A gap is left between the inner bottom wall of the first accommodating groove (102) and the pressure transmission block (3). A transmission spring sheet (8) is arranged in the first accommodating groove (102). The transmission spring sheet (8) comprises an abutting portion (81) and an elastic portion (82) connected thereto. The abutting portion (81) is connected to the transmission ejector pin (6). The elastic portion (82) extends toward the direction of the pressure transmission block (3) and abuts against it.

5. A high-precision pressure sensor according to claim 4, characterized in that: A limiting column (9) is arranged on the inner bottom wall of the first accommodating groove (102), a limiting hole (83) corresponding to the limiting column (9) is opened on the abutting portion (81), and the limiting column (9) passes through the limiting hole (83).

6. A high-precision pressure sensor according to claim 2, characterized in that: A limiting ring groove (23) is provided on the inner bottom wall of the second accommodating groove (21), and the limiting ring groove (23) is coaxially connected to the pressure inlet pipe (22). A connecting ring body (72) is coaxially provided on the side of the limiting ring close to the pressure inlet pipe (22), and the connecting ring body (72) is embedded in the limiting ring groove (23).

7. A high-precision pressure sensor according to claim 2, characterized in that: A tightening ring body (71) is provided on one side of the sealing ring (7) close to the spacer (5); the tightening ring body (71) is coaxially arranged with the sealing ring (7), and the tightening ring body (71) is tightly pressed against the spacer (5).

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