Reinforced insulating oil seal composite sensor

Abstract

The invention relates to a reinforced insulating oil seal composite sensor, belongs to the field of sensors, and provides a reinforced insulating oil seal composite sensor aiming at the problems that an existing sensor is inconvenient to install and cannot meet a high-voltage use environment, which comprises an installation body with an assembly cavity, and a high-strength substrate arranged in the assembly cavity in a sealing manner, the isolation diaphragm is arranged at one end of the assembly cavity in a sealed mode, and a pressure sensing core body is arranged on the high-strength substrate. The supporting seat is arranged in the assembly cavity, one end of the supporting seat is spaced from the isolation diaphragm, and the other end is connected with the pressure sensing core body; insulating oil is filled between the isolation diaphragm and the high-strength substrate, and the supporting seat is filled with the insulating oil; the temperature sensor is clamped at the sensing end; and the pressure and the temperature of the fluid are respectively transmitted to the pressure sensing core body and the temperature sensor through the isolation diaphragm and the insulating oil. Installation is convenient, the pressure sensing core body is far away from the isolation diaphragm, the insulation performance is good, and the device is suitable for being used in a high-voltage environment; the temperature sensor is close to the isolation diaphragm, and the temperature measurement time delay is short.

Description

Technical Field

[0001] The invention belongs to the field of sensors, and in particular relates to a reinforced insulating oil-sealed composite sensor. Background Art

[0002] One existing pressure-temperature composite sensor has a structure in which 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 large volume of the overall sensor, inconvenient installation, and not suitable for a compact use environment, such as in a car engine. Another existing multifunctional sensor uses a protrusion that encapsulates at least one temperature sensor and a carrier on which a pressure sensor is installed. In this structure, the protrusion of the built-in temperature sensor protrudes from the end face of the entire sensor housing, which is easy to accidentally touch during installation, resulting in an unstable structure. In addition, air is provided in the space surrounded by the protrusion, and air with a low thermal conductivity will seriously affect the accuracy of temperature measurement. In addition, the pressure sensor is close to the end face, which results in insufficient electrical isolation space between the pressure sensor and the fluid to be measured, and can only withstand lower voltages, limiting the scope of use.

[0003] Therefore, the above two existing sensors are not easy to install and cannot meet the high voltage use environment. Summary of the invention

[0004] In view of the problem that the existing sensors are neither easy to install nor can they meet the high voltage use environment, the present invention provides a reinforced insulating oil seal composite sensor, which solves the problems existing in the prior art by setting an oil seal space between the isolation diaphragm and the high-strength substrate, and setting a pressure sensing core and a temperature sensor in the oil seal space, while keeping the pressure sensing core away from the isolation diaphragm and the temperature sensor close to the isolation diaphragm.

[0005] The technical solution adopted by the present invention is as follows: a reinforced insulating oil seal composite sensor, comprising:

[0006] The mounting body has an assembly cavity, one end of which is a detection end, and an isolation diaphragm capable of contacting and conducting with the fluid is sealed and arranged at the detection end; the mounting body adopts an isolation diaphragm front structure, which greatly reduces the difficulty of the production process of this type of sensor, thereby reducing the cost;

[0007] A high-strength substrate is sealed and arranged in the assembly cavity, and a pressure sensing core is arranged on the high-strength substrate;

[0008] A support seat, the support seat is arranged in the assembly cavity, and the two ends of the support seat respectively form a sensing end and a connecting end, a hollow cavity is passed through the sensing end and the connecting end, the sensing end is spaced apart from the isolation diaphragm, and the connecting end is connected to the pressure sensing core; insulating oil is filled between the isolation diaphragm and the high-strength substrate, and the insulating oil fills the inside of the hollow cavity, forming an oil seal between the isolation diaphragm and the high-strength substrate;

[0009] A temperature sensor, the temperature sensor is connected to the high-strength substrate through a connecting wire and is clamped to the sensing end;

[0010] During operation, the pressure and temperature of the fluid are transmitted to the pressure sensing core and the temperature sensor respectively through the isolation diaphragm and the insulating oil.

[0011] The pressure sensing core and the temperature sensor are both arranged in the oil seal space between the isolation diaphragm and the high-strength substrate, and there are no protruding parts, which can ensure that the entire sensor structure is compact. When installing, it is sufficient to ensure that the isolation diaphragm contacts the fluid, which is convenient to install and suitable for use in confined spaces; the pressure sensing core is far away from the detection end, which can ensure that the pressure sensing is sensitive, reduce the impact of high-temperature fluid on the pressure sensing core (especially high-temperature baking), and ensure the service life of the pressure sensing core. The pressure sensing core and the isolation diaphragm are filled with insulating oil to form a larger electrical isolation space, that is, there is enough creepage distance and electrical clearance between the electrical connection component of the present application and the isolation diaphragm, which can directly withstand the non-isolated application environment of the electric pressure signal and the mains, and the isolation strength is relatively high; accordingly, compared with traditional sensors, the insulation performance of the reinforced insulating oil seal composite sensor of the present application is enhanced to reach the enhanced insulation level. In addition, the temperature sensor is close to the detection end. Due to the short heat conduction path, the isolation diaphragm and the insulating oil can quickly approach the fluid to be measured in a short time, which is equivalent to the temperature sensor being able to contact the fluid and quickly measure the fluid temperature. The temperature measurement delay is short and the measurement result is more accurate.

[0012] Furthermore, a section of the assembly cavity is a conical cavity, the conical cavity is close to the isolation diaphragm, and gradually decreases in diameter toward the support seat, and the sensing end of the support seat is arranged in the conical cavity. The conical cavity can play a collecting role. When the isolation diaphragm is subjected to pressure sensing, the insulating oil can quickly transmit the pressure to the pressure sensing core under the collecting effect of the conical cavity. In addition, the conical cavity can take into account the deformation freedom of the isolation diaphragm and the installation deformation stress of the installation body, thereby ensuring sensitivity and having a low processing cost.

[0013] Furthermore, the hollow cavity has a limiting section for accommodating the temperature sensor, and the limiting section includes a conical inner wall, and the conical inner wall gradually decreases in diameter along the sensing end toward the pressure sensing core, so that the temperature sensor can be engaged with the conical inner wall. The connecting line of the temperature sensor can pass through the hollow cavity and be connected to the pressure sensing core. In this structure, the conical inner wall can prevent the temperature sensor from sliding off and contacting the isolation diaphragm, and the limiting effect is better.

[0014] Furthermore, the hollow cavity also includes a through-hole, the hole wall of which is connected to the conical inner wall. The insulating oil used as the oil seal passes through the hole and directly contacts the pressure sensing core. 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, thereby ensuring accurate measurement results.

[0015] Furthermore, a pressure ring is provided on the outer side of the isolation diaphragm, and the pressure ring and the isolation diaphragm are connected to the detection end of the mounting body by welding. The pressure ring has a good protective effect on the isolation diaphragm, and the isolation diaphragm is directly sealed with oil on the mounting body, which has a lower process cost than directly using an oil sealing core with a higher packaging cost.

[0016] Furthermore, a sealing ring is provided inside the high-strength substrate, and the sealing ring is located at the connection between the high-strength substrate and the mounting body. A sealing space for insulating oil is formed between the sealing ring and the isolation diaphragm, so the sealing effect is better.

[0017] Furthermore, an end seat is provided outside the high-strength substrate, and a circuit board is provided between the end seat and the high-strength substrate. The circuit board is located outside the high-strength substrate, that is, outside the seal between the high-strength substrate and the mounting body to prevent water from entering the circuit board.

[0018] Furthermore, the mounting body has a mounting portion and a connecting portion that enclose the assembly cavity, the mounting portion is provided with an assembly step to facilitate tool clamping for force application, the connecting portion is provided with an external thread, and the end of the connecting portion forms the detection end. 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.

[0019] The invention has the following beneficial effects: the invention is a reinforced insulating oil-seal composite sensor, the pressure sensing core and the temperature sensor are both arranged in the oil-seal space between the isolation diaphragm and the high-strength substrate, the entire sensor structure is compact, easy to install, and suitable for use in confined spaces; the pressure sensing core is far away from the detection end, which can reduce the impact of high-temperature fluid on the pressure sensing core while ensuring the pressure sensing sensitivity, thereby ensuring the service life of the pressure sensing core; the pressure sensing core and the isolation diaphragm are filled with insulating oil, forming a larger electrical isolation space, which is suitable for use in a high-voltage environment. In addition, the temperature sensor is close to the detection end, the temperature measurement delay is short, and the measurement result is more accurate. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 To strengthen the overall structure diagram of the insulating oil seal composite sensor;

[0021] Figure 2 To strengthen the schematic diagram of the assembly structure of the insulating oil seal composite sensor;

[0022] Figure 3 To strengthen the internal structure diagram of the insulating oil-sealed composite sensor;

[0023] Figure 4 It is a structural schematic diagram of the installation body;

[0024] Figure 5 is a schematic diagram of the internal structure of the installation body;

[0025] Figure 6 It is a structural schematic diagram of the support seat;

[0026] Figure 7 Schematic diagram of the internal structure of the support seat;

[0027] In the figure: 1-mounting body; 11-assembly cavity; 111-conical cavity; 12-detection end; 13-limiting gasket; 14-outer edge; 15-mounting part; 16-connecting part; 2-isolation diaphragm; 3-high-strength substrate; 4-pressure sensing core; 5-support seat; 51-sensing end; 52-connecting end; 53-hollow cavity; 531-conical inner wall; 532-allowance hole; 533-equal diameter inner wall; 534-expanded diameter cavity; 54-limiting part; 55-expanded diameter part; 6-temperature sensor; 7-pressure ring; 8-end seat; 9-sealing ring. DETAILED DESCRIPTION

[0028] 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.

[0029] This embodiment is a reinforced insulating oil seal composite sensor, the overall structure is as follows Figure 1 , Figure 2 and Figure 3 As shown, it includes a mounting body 1, a high-strength substrate 3 sealed in an assembly cavity 11, a support seat 5 arranged in the assembly cavity 11, and a temperature sensor 6 mounted on the support seat 5:

[0030] The mounting body 1 has an assembly cavity 11, and the specific structure is as follows Figure 4 and Figure 5 As shown, one end of the assembly cavity 11 is the detection end 12, and the isolation diaphragm 2 is sealed and arranged at the detection end 12, which can contact with the fluid and transmit signals; a pressure ring 7 is provided on the outside of the isolation diaphragm 2, and the pressure ring 7 and the isolation diaphragm 2 are connected to the detection end 12 of the mounting body 1 by welding. The pressure ring 7 has a good protective effect on the isolation diaphragm 2, and the isolation diaphragm 2 is directly sealed with oil on the mounting body 1, which has a lower process cost compared to directly using an oil sealing core with a higher packaging cost. The mounting body 1 adopts an isolation diaphragm front structure (that is, the isolation diaphragm 2 directly contacts the fluid to be measured, and there is no drainage cavity on the test surface side of the isolation diaphragm 2), which greatly reduces the difficulty of the production process of this type of sensor, thereby reducing the cost.

[0031] A high-strength substrate 3 is provided with a pressure-sensing core 4; a sealing ring 9 is provided at the connection between the high-strength substrate 3 and the assembly cavity 11, and a sealing space for insulating oil is formed between the sealing ring 9 and the isolation diaphragm 2. As shown in the figure, in this embodiment, the sealing ring 9 is clamped by the high-strength substrate 3 and the inner wall of the assembly cavity 11 along the axial direction of the mounting body 1 to ensure a good sealing effect. The high-strength substrate 3 can also play a supporting and pressure-resistant role, providing sufficient support for the pressure-sensing core 4.

[0032] The support seat 5 is arranged in the assembly cavity 11, and the two ends of the support seat 5 form a sensing end 51 and a connecting end 52 respectively. A hollow cavity 53 is passed through the sensing end 51 and the connecting end 52. The sensing end 51 is spaced apart from the isolation diaphragm 2, and the connecting end 52 is connected to the pressure sensing core 4; the insulating oil is filled between the isolation diaphragm 2 and the high-strength substrate 3, and the insulating oil fills the inside of the hollow cavity 53 to form an oil seal between the isolation diaphragm 2 and the high-strength substrate 3; a section of the assembly cavity 11 is a cone The conical cavity 111 is close to the isolation diaphragm 2 and gradually decreases in diameter toward the support seat 5; the sensing end 51 of the support seat 5 is arranged in the conical cavity 111; the conical cavity 111 can play a collecting role. When the isolation diaphragm 2 is subjected to pressure sensing, under the collecting effect of the conical cavity 111, the insulating oil can quickly transmit the pressure to the pressure sensing core 4. In addition, the conical cavity 111 can take into account 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.

[0033] A temperature sensor 6, which is connected to the high-strength substrate 3 via a connecting wire and is clamped to the sensing end 51;

[0034] During operation, the pressure and temperature of the fluid are transmitted to the pressure sensing core 4 and the temperature sensor 6 respectively through the isolation diaphragm 2 and the insulating oil.

[0035] The pressure sensing core 4 and the temperature sensor 6 are both arranged in the oil seal space between the isolation diaphragm 2 and the high-strength substrate 3, which can ensure that the entire sensor structure is compact and suitable for use in confined spaces; the insulating oil not only has good insulation, but also has good pressure conduction. The pressure sensing core 4 is far away from the detection end 12, which can ensure that the pressure sensing is sensitive, reduce the impact of high-temperature fluid on the pressure sensing core 4 (especially high-temperature baking can easily cause components to soften), and ensure the service life of the pressure sensing core 4. It can measure temperature and pressure in a fluid environment up to 120°C. The pressure sensing core 4 and the isolation diaphragm 2 are filled with insulating oil to form a larger electrical isolation space, that is, there is enough creepage distance and electrical clearance between the electrical connection component and the isolation diaphragm 2, which can directly withstand the non-isolated application environment of the electric pressure signal and the mains, and the isolation strength can reach 2500V. Accordingly, compared with traditional sensors, the insulation performance of the reinforced insulating oil seal composite sensor of the present application is enhanced to reach the enhanced insulation level. In addition, the temperature sensor 6 is close to the detection end 12. Due to the short heat conduction path, the isolation diaphragm 2 and the insulating oil can quickly approach the fluid to be measured in a short time, which is equivalent to the temperature sensor 6 being able to contact the fluid and quickly measure the fluid temperature. The temperature measurement delay is short and the measurement result is more accurate.

[0036] like Figure 4 and Figure 5 As shown, the mounting body 1 has a mounting portion 15 and a connecting portion 16 that enclose the mounting cavity 11. The mounting portion 15 is provided with an assembly step to facilitate clamping with a tool for applying force. The connecting portion 16 is provided with an external thread, and the end of the connecting portion 16 forms the detection end 12. By providing the external thread, it is convenient to disassemble and replace the mounting body. When the tight fit force is insufficient, the assembly step of the mounting portion 15 can be clamped with a tool to apply force.

[0037] In this embodiment, Figure 6 and Figure 7 As shown, the support seat 5 has a limit portion 54 and an expansion portion 55 that are connected and face different directions, wherein the end face of the limit portion 54 forms the sensing end 51, and the end face of the expansion portion 55 forms the connecting end 52, and the inner walls of the limit portion and the expansion portion 55 surround the hollow cavity 53, and the expansion portion 55 has an expansion cavity 534 inside. The high-strength substrate 3 is connected to the support seat 5 as a whole, and the pressure sensing core 4 is accommodated in the expansion cavity 534. The outer diameter of the expansion portion 55 is greater than the outer diameter of the limit portion 54, and then the expansion portion 55 and the outer wall of the limit portion 54 form a step structure, and the cavity wall of the assembly cavity 11 has a step surface, so that it can be stuck on the cavity wall of the assembly cavity 11. The limiting section is provided with a conical inner wall 531 and an equal-diameter inner wall 533 connected to the conical inner wall 531. The conical inner wall 531 gradually decreases in diameter along the sensing end 51 toward the pressure sensing core 4 until it is connected to the equal-diameter inner wall 533, so that the temperature sensor 6 can be snapped onto the conical inner wall 531. The connecting line of the temperature sensor 6 passes through the hollow cavity 53 and is connected to the pressure sensing core 4. The temperature sensor 6 is suspended at the sensing end 51. The conical inner wall 541 can prevent the temperature sensor 6 from slipping and contacting the isolation diaphragm 2, and the limiting effect is good. The hollow cavity 53 also includes a through-hole 532, and the hole wall of the hole 532 is connected to the conical inner wall 531. The insulating oil as an oil seal passes through the hole 532 and directly contacts the pressure sensing core 4. As the only transmission medium, the insulating oil has a small loss when the pressure is transmitted from the isolation diaphragm 2 to the pressure sensing core 4, ensuring accurate measurement results.

[0038] An end seat 8 is provided on the outside of the high-strength substrate 3, and a circuit board is provided between the end seat 8 and the high-strength substrate 3, and the circuit board is connected to the pressure sensing core 4 and the temperature sensor 6. The circuit board is located on the outside of the high-strength substrate 3, and is electrically isolated by the sealing ring 9 and the oil seal, and is located on the outside of the seal between the high-strength substrate 3 and the mounting body 1 to prevent water from entering the circuit board and ensure the service life of the sensor.

[0039] In actual tests, the temperature delay T0.9FS of the sensor in this embodiment is less than 15S.

[0040] In this embodiment, Figure 6 and Figure 7 As shown, the hollow cavity 53 includes a conical inner wall 531, a clearance hole 532, a constant diameter inner wall 533 and an expanded diameter cavity 534, wherein the conical inner wall 531 and the constant diameter inner wall 533 have two groups, which are symmetrically arranged with each other, and the clearance holes 532 have two groups, which are symmetrically arranged on both sides of the two groups of conical inner walls 531 and the constant diameter inner wall 533. The size of the expanded diameter cavity 534 is larger than the area surrounded by the conical inner wall 531, the constant diameter inner wall 533 and the clearance hole 532. When the isolation diaphragm is hit by the fluid and the insulating oil is disturbed, the conical inner wall 531 pushes the insulating oil to The insulating oil is gathered on one side of the pressure sensing core 4. Since the temperature sensor 6 is arranged on the conical inner wall 531, the flow space of the insulating oil will be compressed, forcing the insulating oil to flow preferentially from the giveway hole 532 and accelerate the flow to the pressure sensing core. Since the size of the expanded diameter cavity 534 is larger than the area surrounded by the conical inner wall 531, the equal diameter inner wall 533 and the giveway hole 532, the insulating oil is squeezed and released at the expanded diameter cavity 534. Therefore, the pressure of the expanded diameter cavity 534 and the conical cavity 11 can be made equivalent, and the pressure sensing core 4 can be evenly stressed, which can ensure the pressure measurement result.

[0041] During installation, the pressure ring 7 and the isolation diaphragm 2 are first welded at the detection end 12, the temperature sensor 6 is clamped on the sensing end 51 of the support seat 5, and the high-strength substrate 3 is arranged at the connecting end 52 of the support seat 5. Then, the support seat 5 with the temperature sensor 6 assembled is arranged in the assembly cavity 11 from the other end, a sealing ring 9 is arranged between the high-strength substrate 3 and the mounting body 1, and a limiting gasket 13 is arranged on the outer side of the high-strength substrate 3. The limiting gasket 13 is clamped on the inner wall of the mounting body 1, so that the positions of the support seat 5, the high-strength substrate 3 and the mounting body 1 are relatively fixed, the end seat 8 is arranged on the outer side of the limiting gasket 13, and the circuit board connected to the pressure sensing core 4 is arranged between the end seat 8 and the high-strength substrate 3. The outer edge 14 of the end of the mounting body 1 can be deformed inwardly under the action of external force to surround the end seat 8 to form a positioning.

[0042] 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. A reinforced insulating oil seal composite sensor, characterized in that: include: A mounting body, the mounting body having an assembly cavity, one end of the assembly cavity being a detection end, and an isolation diaphragm capable of contacting and conducting with the fluid is sealed and arranged at the detection end; A high-strength substrate is sealed and disposed in the assembly cavity, and a pressure sensing core is disposed on the high-strength substrate; A support seat, the support seat is arranged in the assembly cavity, and the two ends of the support seat respectively form a sensing end and a connecting end, a hollow cavity is passed through the sensing end and the connecting end, the sensing end is spaced apart from the isolation diaphragm, and the connecting end is connected to the pressure sensing core; insulating oil is filled between the isolation diaphragm and the high-strength substrate, and the insulating oil fills the inside of the hollow cavity, forming an oil seal between the isolation diaphragm and the high-strength substrate; A temperature sensor, the temperature sensor is connected to the high-strength substrate through a connecting wire and is clamped to the sensing end; During operation, the pressure and temperature of the fluid are transmitted to the pressure sensing core and the temperature sensor respectively through the isolation diaphragm and the insulating oil.

2. The reinforced insulating oil-sealed composite sensor according to claim 1 is characterized in that: A section of the assembly cavity is a conical cavity, the conical cavity is close to the isolation diaphragm and gradually decreases in diameter toward the support seat, and the sensing end of the support seat is arranged in the conical cavity.

3. The reinforced insulating oil-sealed composite sensor according to claim 2 is characterized in that: The hollow cavity has a limiting section for accommodating the temperature sensor, and the limiting section includes a conical inner wall, and the conical inner wall gradually decreases in diameter along the sensing end toward the pressure sensing core, so that the temperature sensor can be clamped with the conical inner wall.

4. The reinforced insulating oil-sealed composite sensor according to claim 3 is characterized in that: The hollow cavity is also provided with a penetrating clearance hole, and the hole wall of the clearance hole is connected to the conical inner wall.

5. The reinforced insulating oil-sealed composite sensor according to claim 1, 2 or 3, characterized in that: A pressure ring is disposed on the outer side of the isolation diaphragm, and the pressure ring and the isolation diaphragm are connected to the detection end of the mounting body by welding.

6. The reinforced insulating oil-sealed composite sensor according to claim 1, 2 or 3, characterized in that: A sealing ring is arranged on the inner side of the high-strength substrate, and the sealing ring is located at the connection between the high-strength substrate and the mounting body.

7. The reinforced insulating oil-sealed composite sensor according to claim 6 is characterized in that: An end seat is arranged on the outer side of the high-strength substrate, and a circuit board is arranged between the end seat and the high-strength substrate.

8. The reinforced insulating oil-sealed composite sensor according to claim 1, characterized in that: The mounting body comprises a mounting portion and a connecting portion which surround the mounting cavity, the mounting portion is provided with an assembly step, the connecting portion is provided with an external thread, and an end of the connecting portion forms the detection end.

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