Oil seal temperature and pressure composite sensor

Abstract

The utility model relates to an oil seal temperature and pressure composite sensor, belongs to the field of sensors, and provides an oil seal temperature and pressure composite sensor for solving the problem that an existing sensor cannot meet the use requirements of accurate measurement and high voltage, the oil seal temperature and pressure composite sensor comprises an installation body with an assembly cavity, and an isolation diaphragm is arranged at the end of the installation body and can make contact with fluid. The first end of the assembly cavity is plugged, the second end of the assembly cavity is provided with a high-strength substrate in a sealed mode, a sealed space is formed between the high-strength substrate and the isolation diaphragm, a temperature sensor and a pressure sensing core body are arranged in the assembly cavity, and the temperature sensor is close to the isolation diaphragm and is positioned through a limiting device arranged in the assembly cavity. The pressure sensing core body is close to the high-strength substrate or arranged on the high-strength substrate, the sealed space is filled with insulating oil, and both the temperature sensor and the pressure sensing core body can make contact with the insulating oil. The sensor provided by the utility model can meet the use requirements of accurate measurement and high voltage.

Description

Technical Field

[0001] The invention belongs to the field of sensors, and in particular relates to an oil seal temperature and pressure composite sensor. Background Art

[0002] Existing temperature and pressure sensors have different requirements in different usage scenarios, so their structures often vary greatly. In existing pressure-temperature composite sensors, the independent pressure sensors and temperature sensors are assembled together, and the pressure sensors and temperature sensors are separately packaged and isolated from the measured medium, resulting in a larger volume of the overall sensor and inaccurate temperature measurement results. Another composite sensor uses a sensing film to form a package, and the pressure sensing component and the temperature sensing component are both set close to the sensing film. Although this structure can meet the requirements of accurate testing, the pressure sensing component is too close to the sensing film and is easily broken down by voltage, and cannot be used in a high-voltage environment. The structure of setting a drainage cavity at the end of the sensor, since the test end is a certain distance away from the fluid to be measured, although there is a certain electrical isolation space, the fluid will have a certain energy loss, which will cause inaccurate testing. Therefore, the existing sensors cannot take into account both the requirements of accurate measurement and high voltage use. Summary of the invention

[0003] In view of the problem that existing sensors cannot meet the requirements of both accurate measurement and high voltage use, the present invention provides an oil-sealed temperature and pressure composite sensor, which forms a sealed space between an isolation diaphragm and a high-strength substrate, and fills the sealed space with insulating oil. By placing the temperature sensor in front and the pressure sensing core in the back, the requirements of both accurate measurement and high voltage use are met.

[0004] The technical solution adopted by the present invention is as follows: an oil-sealed temperature and pressure composite sensor, comprising a mounting body with an assembly cavity, an isolation diaphragm being provided at the end of the mounting body, the isolation diaphragm being able to contact with the fluid and sealing the first end of the assembly cavity for conducting the temperature and pressure of the fluid, a high-strength substrate being sealed at the second end of the assembly cavity, a sealed space being formed between the high-strength substrate and the isolation diaphragm, a temperature sensor for sensing temperature and a pressure sensing core for sensing pressure being provided in the assembly cavity, the temperature sensor being close to the isolation diaphragm and being positioned by a limiting device provided in the assembly cavity, the pressure sensing core being close to the high-strength substrate or provided on the high-strength substrate, the sealed space being filled with insulating oil, and both the temperature sensor and the pressure sensing core being able to contact the insulating oil.

[0005] The isolation diaphragm is in contact with the fluid to be measured, and the temperature sensor is suspended in the assembly cavity through a limit device. The temperature sensor is as close to the isolation diaphragm as possible and does not touch the isolation diaphragm. Such a mechanism has a short conduction path and small fluid heat loss. The isolation diaphragm and the insulating oil can quickly approach the fluid to be measured in a short time, thereby ensuring accurate measurement results; the pressure sensing core is close to the high-strength substrate or is arranged on the high-strength substrate, that is, it is arranged away from the isolation diaphragm. The pressure sensing core and the temperature sensor are both arranged in a sealed space filled with insulating oil, that is, the structure of the present application has sufficient creepage distance and electrical clearance. Compared with traditional sensors, the sensor of the present application has better insulation performance and higher isolation strength, and is suitable for use in high voltage environments. Therefore, the sensor of the present application can take into account both accurate measurement and high voltage usage requirements.

[0006] As an improvement, the limit device includes a support seat arranged in the assembly cavity, the support seat is connected to the high-strength substrate as a whole, the support seat includes a receiving cavity and a clearance hole located on the side of the receiving cavity, the temperature sensor is limited to the receiving cavity, and the clearance hole runs through the support seat, so that the pressure sensing core can contact the insulating oil. The set clearance hole forms a flow channel for the insulating oil between the isolation diaphragm and the pressure sensing core, so that the detection section of the pressure sensing core contacts the insulating oil. The insulating oil is the only transmission medium, and the pressure loss is small when it is transmitted from the isolation diaphragm to the pressure sensing core, ensuring accurate measurement results.

[0007] Furthermore, the accommodating cavity has a tapered section, the tapered section gradually expands in diameter along the high-strength substrate toward the isolation diaphragm, and the temperature sensor is clamped at the tapered section. The tapered section can prevent the temperature sensor from sliding off and contacting the isolation diaphragm, and has a good limiting effect.

[0008] As another improvement, the limiting device includes a limiting portion integrated with the mounting body, the limiting portion is close to the isolation diaphragm, and is spaced apart from the inner wall of the assembly cavity to form a channel for the insulating oil to flow through, the limiting portion is provided with a through hole, and the temperature sensor is clamped at the through hole from bottom to top.

[0009] Furthermore, a section of the assembly cavity is a conical cavity, the conical cavity is close to the first end of the mounting body and is adjacent to the isolation diaphragm, and the conical cavity gradually decreases in diameter along the isolation diaphragm toward the high-strength substrate. The conical cavity can take into account both the deformation freedom of the isolation diaphragm and the installation deformation stress of the mounting body, ensure sensitivity, and have low processing costs; when the isolation diaphragm is subjected to pressure for sensing, the insulating oil can quickly transmit the pressure to the pressure sensing core under the gathering effect of the conical cavity, ensuring the sensing accuracy.

[0010] Furthermore, the mounting body has a mounting portion and a threaded portion that enclose the assembly cavity, the mounting portion is provided with an assembly step to facilitate clamping and force application by a tool, the threaded portion has an external thread, and the end of the threaded portion forms the first end of the mounting body. By providing the external thread, it is convenient to disassemble and replace the mounting body, and when the tight fit force is insufficient, the assembly step of the mounting portion can be clamped by a tool to apply force.

[0011] Furthermore, a pressure ring is provided at the first end of the mounting body, the pressure ring surrounds the outer side of the isolation diaphragm, and the pressure ring and the isolation diaphragm are welded to the first end of the mounting body. The pressure ring provides good protection for the isolation diaphragm to prevent sharp objects from directly piercing the isolation diaphragm; compared with directly using an oil sealing core with a higher packaging cost, the present application directly adds an isolation diaphragm to seal the oil on the mounting body, which has a lower process cost.

[0012] Furthermore, a sealing ring is provided at the connection between the high-strength substrate and the mounting body to form a seal at the second end of the mounting body. Insulating oil and a sealing ring are used to form two seals between the isolation diaphragm and the high-strength substrate, and the sealing effect is good.

[0013] Furthermore, a circuit board is connected to the outside of the high-strength substrate, and an end seat is arranged on the outside of the high-strength substrate to surround the circuit board between the end seat and the high-strength substrate. The circuit board is located on the outside of the high-strength substrate, that is, on the outside of the sealing ring, and this arrangement can prevent water from entering the circuit board.

[0014] The beneficial effects of the present invention are as follows: the present invention is an oil-sealed temperature-pressure composite sensor, which can take into account both accurate measurement and high voltage use requirements; the temperature sensor is arranged close to the isolation diaphragm to ensure accurate measurement results; the pressure signal of the fluid is transmitted to the pressure sensing core through the isolation diaphragm and insulating oil, with small pressure loss and accurate measurement; the pressure sensing core and the temperature sensor are both arranged in a sealed space filled with insulating oil, and the pressure sensing core is arranged away from the isolation diaphragm, forming a larger electrical isolation space between the pressure sensing core and the isolation diaphragm, with high isolation strength, and is suitable for use in a high voltage environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a schematic diagram of the overall structure of the oil seal temperature and pressure composite sensor of Example 1;

[0016] Figure 2 This is a schematic diagram of the internal structure of the oil seal temperature and pressure composite sensor of Example 1;

[0017] Figure 3 This is a schematic diagram of the assembly structure of the oil seal temperature and pressure composite sensor of Example 1;

[0018] Figure 4This is a schematic diagram of the internal structure of the installation body of Example 1;

[0019] Figure 5 This is a schematic diagram of the overall structure of the support base of Example 1;

[0020] Figure 6 This is a schematic diagram of the internal structure of the support base of Example 1;

[0021] Figure 7 This is a schematic diagram of the internal structure of the oil seal temperature and pressure composite sensor of Example 2;

[0022] Figure 8 This is a schematic diagram of the internal structure of the oil seal temperature and pressure composite sensor of Example 3;

[0023] In the figure: 1-mounting body; 11-assembly cavity; 111-conical cavity; 12-mounting portion; 13-threaded portion; 2-isolation diaphragm; 21-pressure ring; 3-high-strength substrate; 4-temperature sensor; 5-pressure sensing core; 6-support seat; 61-allowance hole; 62-conical section; 7-end seat; 8-sealing ring; 9-blocking piece. DETAILED DESCRIPTION

[0024] The following is an explanation and description of the technical solutions of the embodiments of the present invention in conjunction with the accompanying drawings of the present invention, but the following embodiments are only preferred embodiments of the present invention, not all. Based on the embodiments in the implementation mode, other embodiments obtained by those skilled in the art without creative work are all within the protection scope of the present invention.

[0025] Example 1

[0026] The oil seal temperature and pressure composite sensor of this embodiment is as follows: Figures 1 to 6 As shown, it includes a mounting body 1 with an assembly cavity 11, an isolation diaphragm 2 is provided at the end of the mounting body 1, the isolation diaphragm 2 can contact with the fluid and seal the first end of the assembly cavity 11 to conduct the temperature and pressure of the fluid, a high-strength substrate 3 is sealed at the second end of the assembly cavity 11, and a sealed space is formed between the high-strength substrate 3 and the isolation diaphragm 2, a temperature sensor 4 for sensing temperature and a pressure sensing core 5 for sensing pressure are provided in the assembly cavity 11, the temperature sensor 4 is close to the isolation diaphragm 2, and is positioned by a limiting device arranged in the assembly cavity 11, the pressure sensing core 5 is close to the high-strength substrate 3 or is arranged on the high-strength substrate 3, and the sealed space is filled with insulating oil, and the temperature sensor 4 and the pressure sensing core 5 can both contact the insulating oil.

[0027] The isolation diaphragm 2 is in contact with the fluid to be measured, and the temperature sensor 4 is arranged close to the isolation diaphragm 2, and the temperature sensor 4 is not in contact with the isolation diaphragm 2. Due to the short conduction path and small heat loss of the fluid, the isolation diaphragm 2 and the insulating oil can quickly approach the fluid to be measured in a short time, and the temperature measurement delay is short, thereby ensuring accurate measurement results; the pressure sensing core 5 is close to the high-strength substrate 3 or is arranged on the high-strength substrate 3, that is, it is arranged away from the isolation diaphragm 2, and the pressure sensing core 5 and the temperature sensor 4 are both arranged in a sealed space filled with insulating oil, and a larger electrical isolation space is formed between the pressure sensing core 5 and the isolation diaphragm 2, that is, the structure of the present application has sufficient creepage distance and electrical clearance. Compared with traditional sensors, the insulation performance of the sensor of the present application is enhanced, and can reach an enhanced insulation level. It can directly withstand the application environment of non-isolated pressure signals and mains power, has high isolation strength, and is suitable for use in high voltage environments. Therefore, the sensor of the present application can take into account both accurate measurement and high voltage usage requirements.

[0028] The limiting device includes a support seat 6 disposed in the assembly cavity 11, the support seat 6 is connected to the high-strength substrate 3 as a whole, the support seat 6 includes a receiving cavity and a clearance hole 61 located on the side of the receiving cavity, the temperature sensor 4 is limited to the receiving cavity, and the clearance hole 61 penetrates the support seat 6, so that the pressure sensing core 5 can contact the insulating oil. The set clearance hole 61 forms a flow channel for the insulating oil between the isolation diaphragm 2 and the pressure sensing core 5, so that the detection section of the pressure sensing core 5 contacts the insulating oil. The insulating oil is the only transmission medium, and the pressure loss is small when it is transmitted from the isolation diaphragm 2 to the pressure sensing core 5, ensuring accurate measurement results.

[0029] The accommodating cavity has a tapered section 62, which gradually expands in diameter along the high-strength substrate 3 toward the isolation diaphragm 2, and the temperature sensor 4 is clamped in the tapered section 62. The tapered section 62 can prevent the temperature sensor 4 from sliding off and contacting the isolation diaphragm 2, and has a good limiting effect.

[0030] A section of the assembly cavity 11 is a tapered cavity 111, the tapered cavity 111 is close to the first end of the mounting body 1 and is adjacent to the isolation diaphragm 2, and the tapered cavity 111 gradually decreases in diameter along the isolation diaphragm 2 toward the high-strength substrate 3. The tapered cavity 111 can take into account both the deformation freedom of the isolation diaphragm 2 and the installation deformation stress of the mounting body 1, thereby ensuring sensitivity and having a low processing cost; when the isolation diaphragm 2 is subjected to pressure for sensing, the insulating oil can quickly transmit the pressure to the pressure sensing core 5 under the convergence effect of the tapered cavity 111, thereby ensuring sensing accuracy.

[0031] The mounting body 1 has a mounting portion 12 and a threaded portion 13 that enclose the mounting cavity 11. The mounting portion 12 is provided with an assembly step to facilitate clamping with a tool for applying force. The threaded portion 13 has an external thread, and the end of the threaded portion 13 forms the first end. By providing the external thread, it is convenient to disassemble and replace the mounting body 1. When the tight fit force is insufficient, the assembly step of the mounting portion 12 can be clamped with a tool to apply force.

[0032] The first end of the mounting body 1 is provided with a pressure ring 21, the pressure ring 21 surrounds the outer side of the isolation diaphragm 2, and the pressure ring 21 and the isolation diaphragm 2 are welded to the first end of the mounting body 1. The pressure ring 21 provides good protection for the isolation diaphragm 2 to prevent sharp objects from directly piercing the isolation diaphragm 2; compared with directly using an oil sealing core with a higher packaging cost, the present application directly adds the isolation diaphragm 2 on the mounting body 1 to seal the oil, which is easy to produce and has a lower process cost.

[0033] A sealing ring 8 is provided at the connection between the high-strength substrate 3 and the mounting body 1 to form a seal at the second end of the mounting body 1. Insulating oil and the sealing ring 8 are used to form two seals between the isolation diaphragm 2 and the high-strength substrate 3, and the sealing effect is good.

[0034] The outer side of the high-strength substrate 3 is connected to a circuit board, and the end seat 7 is arranged on the outer side of the high-strength substrate 3, enclosing the circuit board between the end seat 7 and the high-strength substrate 3. The circuit board is located on the outer side of the high-strength substrate 3, that is, on the outer side of the sealing ring 8, and this arrangement can prevent water from entering the circuit board. A baffle 9 is arranged between the end seat 7 and the high-strength substrate 3, and the baffle 9 is used to limit the high-strength substrate 3 to prevent the high-strength substrate 3 from falling out from the second end of the mounting body 1 when stacking and assembling.

[0035] Example 2

[0036] In this embodiment, the limiting device includes a limiting portion connected to the mounting body 1 as a whole, and the limiting portion has a structure as shown in FIG. Figure 7 As shown, the limiting portion is close to the isolation diaphragm 2 and is spaced apart from the inner wall of the assembly cavity 11 to form a channel for the insulating oil to flow through. The limiting portion is provided with a through hole, and the temperature sensor 4 is clamped at the through hole from bottom to top.

[0037] Example 3

[0038] In this embodiment, the limiting device includes a limiting portion connected to the mounting body 1 as a whole, and the limiting portion has a structure as shown in FIG. Figure 8As shown, it is a support frame, which has an annular limiting ring for positioning the temperature sensor 4. The limiting ring is supported by a supporting foot connected to the high-strength substrate 3. The supporting foot can be placed on the cavity wall of the assembly cavity 11, and the insulating oil can flow through the gap between the supporting feet and then contact the pressure sensing core. The limiting portion is close to the isolation diaphragm 2, and the temperature sensor 4 is clamped at the limiting ring from bottom to top.

[0039] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Those skilled in the art should understand that the present invention includes but is not limited to the contents described in the drawings and the above specific embodiments. Any modification that does not deviate from the functional and structural principles of the present invention will be included in the scope of the claims.

Claims

1. An oil seal temperature and pressure composite sensor, characterized in that: It comprises a mounting body with an assembly cavity, an isolation diaphragm is arranged at the end of the mounting body, the isolation diaphragm can contact with the fluid and seal the first end of the assembly cavity for conducting the temperature and pressure of the fluid, a high-strength substrate is sealed at the second end of the assembly cavity, a sealed space is formed between the high-strength substrate and the isolation diaphragm, a temperature sensor for sensing temperature and a pressure sensing core for sensing pressure are arranged in the assembly cavity, the temperature sensor is close to the isolation diaphragm and is positioned by a limiting device arranged in the assembly cavity, the pressure sensing core is close to the high-strength substrate or is arranged on the high-strength substrate, the sealed space is filled with insulating oil, and both the temperature sensor and the pressure sensing core can contact the insulating oil.

2. The oil seal temperature and pressure composite sensor according to claim 1, characterized in that: The limiting device includes a support seat arranged in the assembly cavity, the support seat is connected to the high-strength substrate as a whole, the support seat includes a accommodating cavity and a clearance hole located on the side of the accommodating cavity, the temperature sensor is limited at the accommodating cavity, and the clearance hole passes through the support seat, so that the pressure sensing core can contact the insulating oil.

3. The oil seal temperature and pressure composite sensor according to claim 2, characterized in that: The accommodating cavity has a tapered section, the tapered section gradually expands in diameter along the high-strength substrate toward the isolation diaphragm, and the temperature sensor is disposed at the tapered section.

4. The oil seal temperature and pressure composite sensor according to claim 1, characterized in that: The limiting device includes a limiting portion integrally connected to the mounting body, the limiting portion is close to the isolation diaphragm, and is spaced apart from the inner wall of the assembly cavity to form a channel for the insulating oil to flow through, the limiting portion is provided with a through hole, and the temperature sensor is clamped at the through hole from bottom to top.

5. The oil seal temperature and pressure composite sensor according to claim 2 or 4, characterized in that: A section of the assembly cavity is a tapered cavity, the tapered cavity is close to the first end of the mounting body and is adjacent to the isolation diaphragm, and the diameter of the tapered cavity gradually decreases along the isolation diaphragm toward the high-strength substrate.

6. The oil seal temperature and pressure composite sensor according to claim 2 or 4, characterized in that: The mounting body comprises a mounting portion and a threaded portion which surround the mounting cavity, the mounting portion is provided with an assembly step, the threaded portion comprises an external thread, and an end portion of the threaded portion forms a first end of the mounting body.

7. The oil seal temperature and pressure composite sensor according to claim 6, characterized in that: A pressure ring is provided at the first end of the mounting body, and the pressure ring surrounds the outer side of the isolation diaphragm. The pressure ring and the isolation diaphragm are both welded to the first end of the mounting body.

8. The oil seal temperature and pressure composite sensor according to claim 2 or 4, characterized in that: A sealing ring is provided at the connection between the high-strength substrate and the mounting body to form a seal at the second end of the mounting body.

9. The oil seal temperature and pressure composite sensor according to claim 8, characterized in that: The outer side of the high-strength substrate is connected with a circuit board, and an end seat is arranged on the outer side of the high-strength substrate to surround the circuit board between the end seat and the high-strength substrate.

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