A high-temperature differential pressure gauge

Abstract

The present invention discloses a high-temperature differential pressure gauge. By providing two pressure guiding parts, and dividing the pressure guiding parts into a first pressure chamber and a second pressure chamber, the first pressure chamber is vacuum, and the second pressure chamber is filled with a pressure guiding working medium. The displacement generated by the first pressure sensor due to the pressure in the pipeline to be measured is transmitted to the second pressure sensor through the magnetic force conduction of two magnetic parts. The second pressure sensor generates pressure on the pressure guiding working medium in the second pressure chamber and transmits it to one side of the differential pressure chamber. The two pressure guiding parts can respectively transmit the pressures upstream and downstream of the pipeline to be measured to both sides of the differential pressure chamber to achieve the measurement of the differential pressure between the upstream and downstream. The vacuum chamber can eliminate the influence of gas convection heat transfer and high-temperature expansion on the two pressure sensors; the displacement transmission method is set to be the mutual repulsion of two magnetic parts for transmission, avoiding the pressure transmission error caused by structural heat conduction, and can achieve high-precision differential pressure measurement of high-temperature fluids, solving the problem that the existing differential pressure gauges have large errors in measuring the differential pressure of high-temperature fluids.

Description

Technical Field

[0001] The present invention belongs to the technical field of differential pressure measurement, and particularly relates to a high-temperature resistant differential pressure gauge. Background Art

[0002] The combination of a supercritical carbon dioxide Brayton cycle power generation system and solar thermal power represents higher efficiency and lower cost per kilowatt-hour of electricity, which is the future development trend of solar thermal power generation. At the same time, due to the high-temperature and high-pressure operating environment of the supercritical carbon dioxide Brayton cycle power generation system, a higher solar concentrating temperature is also required. Therefore, the temperature of the high-temperature molten salt used in the solar thermal system for heat absorption, heat transfer, and heat storage reaches 650 - 800 °C. A microchannel heat exchanger is a more suitable heat exchanger for high-temperature molten salt and carbon dioxide. However, there is a risk of blockage in the flow channels of the microchannel heat exchanger, and a differential pressure gauge needs to be set to monitor the differential pressure between the upstream and downstream of the heat exchanger.

[0003] Existing differential pressure gauges have the disadvantages of not being resistant to high temperatures and having large measurement errors under large temperature differences. Generally, the measured working medium is in the pressure guiding tube of the differential pressure gauge, and the measured working medium directly acts on the diaphragm of the differential pressure sensor to measure the differential pressure between the upstream and downstream of the pipeline. The diaphragm of the sensor and the electrical part are integrated, with poor heat insulation performance and temperature resistance. Generally, the temperature of the measured fluid working medium does not exceed 150 °C, making it difficult to adapt to high-temperature environments. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a high-temperature resistant differential pressure gauge to solve the problem of large measurement errors of existing differential pressure gauges in measuring the differential pressure of high-temperature fluids.

[0005] To solve the above problems, the technical solution of the present invention is as follows:

[0006] A high-temperature resistant differential pressure gauge of the present invention includes:

[0007] Two pressure guiding parts, the pressure input ends of the two pressure guiding parts are respectively connected to different positions of the pipeline to be measured;

[0008] A differential pressure chamber, both sides of the differential pressure chamber are respectively communicated with the pressure output ends of the two pressure guiding parts through pressure guiding tubes;

[0009] Wherein, any one of the pressure guiding parts includes a first pressure sensor and a second pressure sensor. The second pressure sensor divides the pressure guiding part into an independent first pressure chamber and a second pressure chamber. The first pressure chamber is vacuum, and a pressure guiding working medium is arranged in the second pressure chamber;

[0010] The first pressure chamber is connected to the pipeline to be measured through the first pressure sensor, and the second pressure chamber is communicated with the differential pressure chamber;

[0011] The first pressure sensor is provided with a first magnetic member, and the second pressure sensor is provided with a second magnetic member. The first magnetic member and the second magnetic member are arranged in a mutually exclusive manner.

[0012] For the high-temperature differential pressure gauge of the present invention, the pressure guiding part further includes a first connecting rod and a first heat radiation isolation layer;

[0013] The first magnetic member is connected to one side of the first pressure sensor close to the second pressure sensor through the first connecting rod;

[0014] The first heat radiation isolation layer is arranged in the first pressure chamber; the first connecting rod passes through the first heat radiation isolation layer.

[0015] For the high-temperature differential pressure gauge of the present invention, the pressure guiding part further includes a heat insulation layer;

[0016] The heat insulation layer is arranged between the first magnetic member and the first connecting rod, and the size of the heat insulation layer is larger than the size of the first magnetic member.

[0017] For the high-temperature differential pressure gauge of the present invention, the pressure guiding part further includes a second heat radiation isolation layer and a second connecting rod;

[0018] The second magnetic member is connected to one side of the second pressure sensor close to the first pressure sensor through the second connecting rod;

[0019] The second heat radiation isolation layer is arranged in the first pressure chamber and is located between the first magnetic member and the second magnetic member.

[0020] For the high-temperature differential pressure gauge of the present invention, the first pressure sensor is a first pressure transmitting diaphragm, and the first pressure transmitting diaphragm includes a diaphragm body and a corrugated outer edge;

[0021] The inner circle of the corrugated outer edge is connected to the outer circle of the diaphragm body;

[0022] Wherein, the corrugated outer edge extends along the diameter direction and the axis direction of the diaphragm body.

[0023] For the high-temperature differential pressure gauge of the present invention, the material of the first pressure transmitting diaphragm is a high-temperature and corrosion-resistant metal material.

[0024] For the high-temperature differential pressure gauge of the present invention, the second pressure sensor is a second pressure transmitting diaphragm, and the second pressure transmitting diaphragm includes a diaphragm body and a corrugated outer edge;

[0025] The inner circle of the corrugated outer edge is connected to the outer circle of the diaphragm body;

[0026] Wherein, the corrugated outer edge extends along the diameter direction and the axis direction of the diaphragm body.

[0027] For the high-temperature differential pressure gauge of the present invention, the pressure guiding part further includes a plurality of heat dissipation fins;

[0028] A plurality of the heat dissipation fins are arranged on the outer wall surfaces of the first pressure chamber and the second pressure chamber.

[0029] For the high-temperature differential pressure gauge of the present invention, the arrangement density of the heat dissipation fins on the first pressure chamber is greater than the arrangement density of the heat dissipation fins on the second pressure chamber.

[0030] For the high-temperature differential pressure gauge of the present invention, the pressure guiding working medium is silicone oil or other temperature-resistant liquids.

[0031] For the high-temperature differential pressure gauge of the present invention, a third diaphragm is provided in the differential pressure chamber, and the differential pressure chamber is divided into a high-pressure chamber and a low-pressure chamber by the third diaphragm.

[0032] Due to the adoption of the above technical solutions, the present invention has the following advantages and positive effects compared with the prior art:

[0033] 1. In an embodiment of the present invention, by providing two pressure guiding parts, and setting the pressure guiding parts as a first pressure chamber and a second pressure chamber, the first pressure chamber is vacuum, and a pressure guiding working medium is provided in the second pressure chamber. The displacement generated by the first pressure sensor due to the pressure in the pipeline to be measured is transmitted to the second pressure sensor through the magnetic force conduction of two magnetic parts. The second pressure sensor generates pressure on the pressure guiding working medium in the second pressure chamber and transmits it to one side of the differential pressure chamber. Therefore, the two pressure guiding parts can respectively transmit the pressures of the upstream and downstream of the pipeline to be measured to both sides of the differential pressure chamber to realize the measurement of the differential pressure between the upstream and downstream. The setting of the vacuum chamber can eliminate heat transfer by gas convection, and can also eliminate the influence of gas expansion due to high temperature on the displacement of the two pressure sensors, reducing pressure transmission error; at the same time, the displacement transmission method is set to be transmitted through the repulsion of two magnetic parts, and there is no contact in the transmission process, avoiding pressure transmission error caused by structural heat conduction, ensuring the accuracy of the transmitted pressure change, and enabling high-precision differential pressure measurement of high-temperature fluids, solving the problem of large error in differential pressure measurement of high-temperature fluids by existing differential pressure gauges.

[0034] 2. In an embodiment of the present invention, the components of the pressure guiding part are fewer, the structure is simple and compact, and the cost is low.

[0035] 3. In an embodiment of the present invention, by providing a first heat radiation isolation layer and a second heat radiation isolation layer, the first heat radiation isolation layer isolates most of the high-temperature heat radiation from the first pressure sensor. The temperature of the first heat radiation isolation layer rises due to the heat radiation, generating secondary heat radiation. The function of the second heat radiation is to isolate the heat transfer of the secondary heat radiation to the second pressure sensor; at the same time, both heat radiation isolation layers can conduct heat outward through the wall surface of the first pressure chamber to reduce their own temperature and heat radiation ability, thereby avoiding errors in heat radiation on the second pressure sensor and displacement transmission.

[0036] 4. In an embodiment of the present invention, the first pressure - transmitting diaphragm is provided with a diaphragm body and a corrugated outer edge. The corrugated outer edge extends in the diameter direction and the axis direction of the diaphragm body, that is, the first pressure - transmitting diaphragm is integrally arranged to be recessed into the inner cavity of the first pressure chamber. The setting of the corrugated outer edge is conducive to bearing pressure and deforming and recovering deformation, and is also conducive to conducting pressure; the recessed setting can prevent the first pressure - transmitting diaphragm from protruding into the connecting pipe, reduce the flow resistance, and avoid hanging impurities.

[0037] 5. In an embodiment of the present invention, fins are arranged on the outer wall surfaces of the first pressure chamber and the second pressure chamber, and heat is dissipated by convection between the fins and the environment to reduce the wall temperature of the first pressure chamber and the second pressure chamber; and the arrangement density of the fins is encrypted at the positions of the first heat - radiation layer and the second heat - radiation layer, so as to more effectively transfer the heat of the first heat - radiation layer and the second heat - radiation layer to the environment, ensure that the temperature of the pressure - guiding working medium in the second pressure chamber and the pressure - guiding pipe does not exceed the temperature limit, and ensure that the pressure - guiding working media in the two pressure - guiding parts have a small temperature difference, thereby improving the measurement accuracy. Description of the Drawings

[0038] Figure 1 is a schematic diagram of the high - temperature - resistant differential pressure gauge of the present invention;

[0039] Figure 2 is a schematic diagram of the pressure - guiding part of the high - temperature - resistant differential pressure gauge of the present invention.

[0040] Description of the reference numerals: 1: pipeline to be measured; 2: first pressure chamber; 3: first pressure - transmitting diaphragm; 4: second connecting rod; 4': first connecting rod; 401: second magnetic part; 402: first magnetic part; 403: heat - insulating layer; 404: second heat - radiation layer; 405: first heat - radiation layer; 5: second pressure chamber; 6: second pressure - transmitting diaphragm; 7: heat - dissipating fins; 8: pressure - guiding pipe; 9: differential pressure chamber; 10: third diaphragm; 11: high - pressure chamber; 12: low - pressure chamber. Detailed Embodiments

[0041] The following further elaborates in detail on a high - temperature - resistant differential pressure gauge proposed by the present invention in conjunction with the accompanying drawings and specific embodiments. According to the following description and the claims, the advantages and features of the present invention will be clearer.

[0042] Refer to Figure 1 and Figure 2 , in an embodiment, a high - temperature - resistant differential pressure gauge includes two pressure - guiding parts and a differential pressure chamber 9. The pressure input ends of the two pressure - guiding parts are respectively communicated with the upstream and downstream of the pipeline 1 to be measured. The two sides of the differential pressure chamber 9 are respectively communicated with the pressure output ends of the two pressure - guiding parts through the pressure - guiding pipes 8. The two pressure - guiding parts transmit the pressure in the pipeline 1 to be measured to the differential pressure chamber 9 through the pressure - guiding pipes 8 to measure the differential pressure between the upstream and downstream.

[0043] Among them, any pressure guiding part includes a first pressure sensor and a second pressure sensor. The second pressure sensor divides the pressure guiding part into an independent first pressure chamber 2 and a second pressure chamber 5. The first pressure chamber 2 is in a vacuum, and the second pressure chamber 5 is filled with a pressure guiding working medium.

[0044] The first pressure chamber 2 is connected to the pipeline 1 to be measured through the above-mentioned first pressure sensor, and the second pressure chamber is communicated with one side of the differential pressure chamber. The first pressure sensor is provided with a first magnetic part 402, and the second pressure sensor is provided with a second magnetic part 401, and the first magnetic part 402 and the second magnetic part 401 are arranged in a mutually exclusive manner.

[0045] In this embodiment, by setting two pressure guiding parts, and setting the pressure guiding parts as the first pressure chamber 2 and the second pressure chamber 5, the first pressure chamber 2 is in a vacuum, and the second pressure chamber 5 is provided with a pressure guiding working medium. The displacement generated by the first pressure sensor due to the pressure in the pipeline 1 to be measured is transmitted to the second pressure sensor through the magnetic force of the two magnetic parts. The second pressure sensor generates pressure on the pressure guiding working medium in the second pressure chamber 5 and transmits it to one side of the differential pressure chamber 9. Therefore, the two pressure guiding parts can respectively transmit the pressures upstream and downstream of the pipeline 1 to be measured to both sides of the differential pressure chamber 9 to realize the measurement of the differential pressure between the upstream and downstream. The setting of the vacuum chamber can eliminate heat transfer by gas convection, and can also eliminate the displacement influence of the gas expansion due to high temperature on the two pressure sensors, reducing the pressure transmission error; at the same time, the displacement transmission method is set to be transmitted through the mutual exclusion of the two magnetic parts, and there is no contact during the transmission process, avoiding the pressure transmission error caused by structural heat conduction, ensuring the accuracy of the transmitted pressure change, and enabling high-precision differential pressure measurement of high-temperature fluids, solving the problem of large errors in the differential pressure measurement of high-temperature fluids by existing differential pressure gauges.

[0046] The specific structure of the high-temperature resistant differential pressure gauge in this embodiment will be further described below:

[0047] In this embodiment, the second pressure chamber 5 is connected to the upper end of the first pressure chamber 2. Both the first pressure chamber 2 and the second pressure chamber 5 can be cylindrical or other shapes. However, when they are cylindrical, the diameter of the second pressure chamber 5 is smaller than that of the first pressure chamber 2, and the diameter of the first pressure sensor needs to be larger than that of the second pressure sensor; when they are other shapes, the diameter of the second pressure chamber 5 also needs to be smaller than that of the first pressure chamber 2, and the size of the first pressure sensor needs to be larger than that of the second pressure sensor.

[0048] In this embodiment, the pressure guiding part may further include a first connecting rod 4' and a first heat radiation isolation layer 405. Among them, the first magnetic part 402 is connected to one side of the first pressure sensor close to the second pressure sensor through the first connecting rod 4'. The edge of the first heat radiation isolation layer 405 is connected to the inner wall surface of the first pressure chamber 2. A round hole is provided on the first heat radiation isolation layer 405, and the first heat radiation isolation layer 405 is sleeved on the first connecting rod 4' through the round hole, that is, the first heat radiation isolation layer 405 is arranged between the first pressure sensor and the first magnetic part 402.

[0049] In this embodiment, the pressure guiding part may further be provided with a heat insulation layer 403. The heat insulation layer 403 is arranged between the first magnetic part 402 and the first connecting rod 4', and the size of the heat insulation layer 403 is larger than that of the first magnetic part 402. By opening a round hole in the first heat radiation isolation layer 405 and sleeving it on the first connecting rod 4', most of the high-temperature heat radiation is isolated; and a heat insulation layer 403 is arranged between the first connecting rod 4' and the first magnetic part 402, and the size of the heat insulation layer 403 is larger than that of the first magnetic part 402. One is to isolate most of the heat conduction of the first connecting rod 4', and the other is to shield the high-temperature heat radiation projected through the gap between the round hole and the first connecting rod 4', which can avoid the problem of magnetic reduction caused by overheating of the magnet.

[0050] Furthermore, the pressure guiding part may further be provided with a second connecting rod 4 and a second heat radiation isolation layer 404. The second magnetic part 401 is connected to one side of the second pressure sensor close to the first pressure sensor through the second connecting rod 4. The first connecting rod 4' and the second connecting rod 4 are coaxial, that is, the first magnetic part 402 and the second magnetic part 401 correspond to each other. The arrangement of the first connecting rod 4' and the second connecting rod 4 can make the two magnetic parts at the best distance to obtain the required magnitude of the repulsive force and ensure the accuracy of displacement transmission.

[0051] The outer edge of the second heat radiation isolation layer 404 is also connected to the inner wall surface of the first pressure chamber 2, and the second heat radiation isolation layer 404 is located between the first magnetic part 402 and the second magnetic part 401.

[0052] Among them, the first heat radiation isolation layer 405 and the second heat radiation isolation layer 404 are made of silicon carbide thin sheets, and the thickness of the first heat radiation isolation layer 405 is less than the thickness of the second heat radiation isolation layer 404.

[0053] By setting the first heat radiation isolation layer 405 and the second heat radiation isolation layer 404, most of the high-temperature heat radiation from the first pressure sensor is isolated by the first heat radiation isolation layer 405. The temperature of the first heat radiation isolation layer 405 rises due to heat radiation, generating secondary heat radiation. The function of the second heat radiation is to isolate the heat transfer of the secondary heat radiation to the second pressure sensor; at the same time, both heat radiation isolation layers can conduct heat outward through the wall surface of the first pressure chamber 2 to reduce their own temperature and heat radiation ability, thereby avoiding errors in heat radiation on the second pressure sensor and displacement transmission.

[0054] In this embodiment, the first pressure sensor is a first pressure transmitting diaphragm. The first pressure transmitting diaphragm 3 includes a diaphragm body and a corrugated outer edge. The inner circle of the corrugated outer edge is connected to the outer circle of the diaphragm body. Among them, the corrugated outer edge extends along the diameter direction and the axis direction of the diaphragm body. By setting the first pressure transmitting diaphragm 3 as the diaphragm body and the corrugated outer edge, and the corrugated outer edge extends along the diameter direction and the axis direction of the diaphragm body, that is, the first pressure transmitting diaphragm 3 as a whole is recessed into the inner cavity of the first pressure chamber 2. The setting of the corrugated outer edge is easy to bear pressure and recover deformation, and is easy to conduct pressure; the recessed setting can make the first pressure transmitting diaphragm 3 not protrude in the pipeline 1 to be measured, reduce the flow resistance, and avoid hanging impurities.

[0055] Furthermore, the material of the first pressure transmitting diaphragm 3 is a metal material with high temperature and corrosion resistance, preferably a nickel-based alloy, to avoid the problem that the pressure transmission is inaccurate due to the destruction of its own structure by high-temperature corrosive fluid.

[0056] Furthermore, the second pressure sensor is a second pressure transmitting diaphragm. The second pressure transmitting diaphragm 6 can also be set as a diaphragm body and a corrugated outer edge. However, since the second pressure transmitting diaphragm 6 does not directly contact the measured medium in the pipeline 1 to be measured, it does not need to extend axially, and only needs to extend in the diameter direction.

[0057] In this embodiment, the pressure guiding part may further include a plurality of heat dissipation fins 7. The plurality of heat dissipation fins 7 are arranged on the outer wall surfaces of the first pressure chamber 2 and the second pressure chamber 5. By arranging fins on the outer wall surfaces of the first pressure chamber 2 and the second pressure chamber 5, the influence of structure heat conduction is reduced, and heat dissipation is carried out by convection between the fins and the environment, so as to reduce the wall temperature of the first pressure chamber 2 and the second pressure chamber 5.

[0058] Furthermore, the arrangement density of the heat dissipation fins 7 on the first pressure chamber 2 is greater than the arrangement density of the heat dissipation fins 7 on the second pressure chamber 5. Specifically, the arrangement density of the fins can be increased at the first heat radiation isolation layer 405 and the second heat radiation isolation layer 404, specifically twice, so as to more effectively transfer the heat of the first heat radiation isolation layer 405 and the second heat radiation isolation layer 404 to the environment, ensure that the temperature of the pressure guiding working medium in the second pressure chamber 5 and the pressure guiding pipe 8 does not exceed the temperature, and ensure that the pressure guiding working media in the two pressure guiding parts are at a small temperature difference, so as to improve the measurement accuracy.

[0059] In this embodiment, a third diaphragm 10 is provided in the differential pressure chamber 9, and the differential pressure chamber 9 is separated into a high-pressure chamber 11 and a low-pressure chamber 12 by the third diaphragm 10. That is, the high-pressure chamber 11 cooperates with the pressure guiding pipe 8, the second pressure chamber 5 and the second pressure transmitting diaphragm 6 of the pressure guiding part located upstream to form a pressure guiding working medium accommodating cavity; the low-pressure chamber 12 cooperates with the pressure guiding pipe 8, the second pressure chamber 5 and the second pressure transmitting diaphragm 6 of the pressure guiding part located downstream to form a pressure guiding working medium accommodating cavity.

[0060] Further, the pressure guiding working medium can specifically be silicone oil or other temperature-resistant liquids. Since this part of the pressure guiding working medium accommodating cavity belongs to the low-temperature section, conventional liquid pressure guiding working media can accurately transmit pressure over long distances.

[0061] In this embodiment, both the first magnetic member 402 and the second magnetic member 401 can be strong magnets.

[0062] In this embodiment, the components of the pressure guiding part are fewer, the structure is simple and compact, so the cost is lower.

[0063] The working principle of the high-temperature differential pressure gauge in this embodiment will be described below:

[0064] Generally, the pressure in the upstream of the pipeline is greater than that in the downstream. The high-temperature fluid in the upstream causes the first pressure transmission diaphragm 3 to be displaced upward, and through the first connecting rod 4', the first magnetic member 402 is pushed to move upward. The mutually repulsive magnetic force passes through the second thermal radiation isolation layer 404 and pushes the second magnetic member 401 to move upward. The second magnetic member 401 pushes the second pressure transmission diaphragm 6 to move upward through the second connecting rod 4. The second pressure transmission diaphragm 6 pushes the silicone oil in the second pressure chamber 5 and moves towards the differential pressure chamber 9 in the pressure guiding pipe 8, forming pressure transmission.

[0065] The high-pressure chamber 11 and the low-pressure chamber 12 of the differential pressure chamber 9 are both connected with the same pressure guiding part through the pressure guiding pipe 8. The strain displacement of the third diaphragm 10 caused by the pressure difference between the upstream and downstream of the transmission pipeline is used to establish the relationship between the strain amount or displacement amount and the differential pressure. The differential pressure between the upstream and downstream of the pipeline is measured by electrically measuring the strain displacement of the third diaphragm 10.

[0066] The embodiments of the present invention have been described in detail above in conjunction with the accompanying drawings. However, the present invention is not limited to the above embodiments. Even if various changes are made to the present invention, provided that these changes fall within the scope of the claims of the present invention and their equivalent technologies, they still fall within the protection scope of the present invention.

Claims

1. A high-temperature resistant differential pressure gauge, characterized in that, Including: Two pressure guiding parts, the pressure input ends of the two pressure guiding parts are respectively connected to different positions of the pipeline to be measured (1); A differential pressure chamber (9), both sides of the differential pressure chamber (9) are communicated with the pressure output ends of the two pressure guiding parts through pressure guiding pipes (8); Wherein, any one of the pressure guiding parts includes a first pressure sensor and a second pressure sensor, the second pressure sensor divides the pressure guiding part into an independent first pressure chamber (2) and a second pressure chamber (5), the inside of the first pressure chamber (2) is vacuum, and a pressure guiding working medium is arranged in the second pressure chamber (5); The first pressure chamber (2) is connected to the pipeline to be measured (1) through the first pressure sensor, and the second pressure chamber (5) is communicated with the differential pressure chamber (9); The first pressure sensor is provided with a first magnetic part (402), the second pressure sensor is provided with a second magnetic part (401), and the first magnetic part (402) and the second magnetic part (401) are arranged in a mutually exclusive manner; The pressure guiding part further includes a first connecting rod (4') and a first heat radiation isolation layer (405); The first magnetic part (402) is connected to the side of the first pressure sensor close to the second pressure sensor through the first connecting rod (4'); The first heat radiation isolation layer (405) is arranged in the first pressure chamber (2); the first connecting rod (4') passes through the first heat radiation isolation layer (405); The pressure guiding part further includes a heat insulation layer (403); The heat insulation layer (403) is arranged between the first magnetic part (402) and the first connecting rod (4'), and the size of the heat insulation layer (403) is larger than the size of the first magnetic part (402); The pressure guiding part further includes a second heat radiation isolation layer (404) and a second connecting rod (4); The second magnetic part (401) is connected to the side of the second pressure sensor close to the first pressure sensor through the second connecting rod (4); The second heat radiation isolation layer (404) is arranged in the first pressure chamber (2) and is located between the first magnetic part (402) and the second magnetic part (401).

2. The high-temperature resistant differential pressure gauge according to claim 1, characterized in that, The first pressure sensor is a first pressure transmitting diaphragm (3), and the first pressure transmitting diaphragm (3) includes a diaphragm body and a corrugated outer edge; The inner circle of the corrugated outer edge is connected to the outer circle of the diaphragm body; Wherein, the corrugated outer edge extends along the diameter direction and the axis direction of the diaphragm body.

3. The high-temperature resistant differential pressure gauge according to claim 1, characterized in that, The material of the first pressure transmitting diaphragm (3) is a high-temperature and corrosion-resistant metal material.

4. The high-temperature resistant differential pressure gauge according to claim 1, characterized in that, The second pressure sensor is a second pressure transmitting diaphragm (6), and the second pressure transmitting diaphragm (6) includes a diaphragm body and a corrugated outer edge; The inner circle of the corrugated outer edge is connected to the outer circle of the diaphragm body; Wherein, the corrugated outer edge extends along the diameter direction and the axis direction of the diaphragm body.

5. The high-temperature resistant differential pressure gauge according to claim 1, characterized in that, The pressure guiding working medium is silicone oil or other temperature-resistant liquids.

6. The high-temperature resistant differential pressure gauge according to claim 1, characterized in that, A third diaphragm (10) is arranged in the differential pressure chamber (9), and the differential pressure chamber (9) is divided into a high-pressure chamber (11) and a low-pressure chamber (12) by the third diaphragm (10).

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