CN220583485U - Double differential pressure sensor - Google Patents
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- CN220583485U CN220583485U CN202322322403.5U CN202322322403U CN220583485U CN 220583485 U CN220583485 U CN 220583485U CN 202322322403 U CN202322322403 U CN 202322322403U CN 220583485 U CN220583485 U CN 220583485U
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- 239000012530 fluid Substances 0.000 claims abstract description 64
- 238000012545 processing Methods 0.000 claims abstract description 34
- 230000009977 dual effect Effects 0.000 claims description 14
- 238000007789 sealing Methods 0.000 claims description 11
- 230000001681 protective effect Effects 0.000 claims description 8
- 238000005259 measurement Methods 0.000 abstract description 12
- 230000003068 static effect Effects 0.000 abstract description 10
- 238000009530 blood pressure measurement Methods 0.000 abstract description 5
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- 229920002545 silicone oil Polymers 0.000 description 2
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Abstract
The utility model provides a double differential pressure sensor, which is arranged on a fluid control valve and comprises a high pressure sensor and a low pressure sensor which are respectively arranged at the high pressure end and the low pressure end of the fluid control valve, a differential pressure sensor which is arranged at the high pressure end and the low pressure end of the fluid control valve, and a micro-processing unit which is respectively and electrically connected with the differential pressure sensor and the low pressure sensor; when the pressure difference between the high pressure end and the low pressure end of the control valve exceeds the range of the differential pressure sensor, measuring the differential pressure value between the pressures by adopting two static pressure sensors to measure the flow; when the pressure difference of the high and low pressure ends of the control valve does not exceed the range of the differential pressure sensor, the differential pressure of the differential pressure sensor is adopted to directly measure the flow; thus, the problem of low differential pressure measurement precision of the pressure sensor with large differential pressure difference between the high pressure end and the low pressure end of the control valve in the prior art is solved, and the problem of small measurement range of differential pressure measurement of flow measured by the two static pressure sensors when the differential pressure of the high pressure end and the low pressure end of the control valve is small is also solved.
Description
Technical Field
The utility model belongs to the technical field of fluid flow measurement, relates to a double differential pressure sensor, and particularly relates to a double differential pressure sensor for a fluid control valve.
Background
Chinese patent CN201220299081.6 discloses an integrated static pressure and differential pressure detection device, as shown in fig. 1, the device includes a differential pressure sensor and its differential pressure lead part, a pressure sensor (static pressure sensor) and pressure lead part, and a micro-processing unit (not shown); the differential pressure sensor comprises a differential pressure sensing element 1-1, and a high-pressure clamping plate 8 and a low-pressure clamping plate 5 which are respectively arranged at the high-pressure sensing end and the low-pressure sensing end of the differential pressure sensing element 1-1; high-pressure sensing cavities and low-pressure sensing cavities are respectively formed between the high-pressure clamping plate, the low-pressure clamping plate and the high-pressure sensing ends and the low-pressure sensing ends of the differential pressure sensing element 1-1, high-pressure fluid inlets and low-pressure fluid inlets which are communicated with the high-pressure sensing cavities and the low-pressure sensing cavities are respectively arranged on the high-pressure clamping plate 8 and the low-pressure clamping plate 5, and the differential pressure sensing element 1-1 is connected with a micro-processing unit through the differential pressure lead part; the pressure sensor (high pressure sensor) comprises a high pressure sensing element 12-1 and a high pressure sensing element shell 12-3 thereof, wherein the high pressure sensing element shell 12-3 is arranged on a high pressure clamping plate, a pressure sensing end of the high pressure sensing element 12-1 and a high pressure sensing end of the differential pressure sensing element 1-1 are positioned in the same pressure sensing cavity (namely, a high pressure sensing cavity), and the high pressure sensing element 12-1 is connected with the micro-processing unit through a pressure lead part and inputs a fluid measurement signal of the fluid measurement signal to the micro-processing unit; in order to ensure that the reference pressure point of the detection device is zeroed, drain valves communicated to the high-pressure sensing cavity and the low-pressure sensing cavity are respectively arranged on the high-pressure clamping plate and the low-pressure clamping plate, and the drain valve 4 is arranged on the low-pressure clamping plate. The integrated static pressure and differential pressure detection device solves the problems that in the prior art, a pressure sensor is connected to a leading-out pipeline at one end of a differential pressure sensor, and the pressure value measured by the fluid control valve is inconsistent with the actual pressure value at the two ends of the differential pressure sensor due to unbalance of the high and low pressure ends of the fluid control valve and different environmental temperature, so that the flow deviation of the control valve is calculated subsequently; however, under the conditions that the pressure difference between the high pressure end and the low pressure end of the fluid control valve in the industrial field is large and the maximum pressure level can be reached, the differential pressure measurement range of the differential pressure sensor in the device is small, so that the fluid flow can not be measured.
Disclosure of Invention
In order to solve the above problems, an object of the present utility model is to provide a dual differential pressure sensor with a large measuring range when the differential pressure between the high and low pressure ends of the fluid control valve is large and with high measuring accuracy when the differential pressure is small, wherein the dual differential pressure sensor is disposed on the fluid control valve and comprises high and low pressure sensors disposed on the high and low pressure ends of the fluid control valve, a differential pressure sensor disposed on the high and low pressure ends of the fluid control valve, and a microprocessor unit electrically connected with the differential pressure sensors.
Preferably, the differential pressure sensor or the high-pressure and low-pressure sensor adopts a piezoresistive pressure sensor or a capacitive pressure sensor or a piezoelectric pressure sensor.
Preferably, the differential pressure sensor comprises a differential pressure sensing element and a cylindrical shell thereof, and a differential pressure electric signal wire; the left end and the right end of the cylindrical shell are respectively provided with a high-pressure clamping plate and a low-pressure clamping plate, the high-pressure clamping plates and the low-pressure clamping plates are fixed at the front end and the rear end of the cylindrical shell through four bolts, and a high-pressure sensing cavity and a low-pressure sensing cavity are respectively formed between the high-pressure sensing surface and the low-pressure sensing surface of the differential pressure sensing element and the high-pressure clamping plates and the low-pressure clamping plates; the upper end of the cylindrical shell is provided with a groove, a funnel-shaped electronic bin base is arranged in the groove, the micro-processing unit is arranged on the inner bottom surface of the wide opening part of the electronic bin base, the neck part of the electronic bin base is provided with an inner sealing body, and the differential pressure electric signal wire passes through the inner sealing body from the bottom end of the neck part of the electronic bin base to be led to the micro-processing unit for electric connection; the high-pressure clamp plate and the low-pressure clamp plate are internally provided with a high-pressure channel and a low-pressure channel which are communicated with the high-pressure sensing cavity and the low-pressure sensing cavity respectively, and fluid inlets of the high-pressure channel and the low-pressure channel are respectively arranged on the left end surfaces of the high-pressure clamp plate and the low-pressure clamp plate.
Preferably, the right end surfaces of the high pressure clamping plate and the low pressure clamping plate are respectively provided with a high pressure drain valve and a low pressure drain valve which are communicated with the high pressure sensing cavity and the low pressure sensing cavity.
Preferably, the high-pressure sensor comprises a high-pressure sensing element and a high-pressure lead part which are arranged in the high-pressure clamping plate in the axial direction of the cylindrical shell, wherein the high-pressure lead part comprises a high-pressure electric signal wire and an external high-pressure lead protective shell thereof, and the high-pressure electric signal wire is used for electrically connecting the high-pressure sensing element with the micro-processing unit.
Preferably, the low pressure sensor comprises a low pressure sensing element and a low pressure lead part which are arranged in the low pressure clamping plate in the axial direction of the cylindrical shell, wherein the low pressure lead part comprises a low pressure signal wire electrically connecting the low pressure sensing element with the micro-processing unit and an external low pressure lead protective shell.
Preferably, the right end surfaces of the high pressure clamping plate and the low pressure clamping plate are respectively provided with a high pressure drain valve and a low pressure drain valve which are communicated with the high pressure sensing cavity and the low pressure sensing cavity.
The utility model also provides a fluid flow measuring method based on the double differential pressure sensor, which comprises the following steps:
the micro-processing unit monitors the differential pressure between the high pressure end and the low pressure end of the fluid control valve in real time by using a differential pressure sensor or one of the high pressure end and the low pressure end of the fluid control valve, and judges whether the differential pressure measured value exceeds the measuring range of the differential pressure sensor:
when the measuring range is exceeded, the micro-processing unit measures the difference value between the pressures of the high pressure end and the low pressure end of the fluid control valve through the high pressure sensor and the low pressure sensor arranged at the high pressure end and the low pressure end of the fluid control valve;
when the measuring range is not exceeded, the micro-processing unit directly measures the flow by measuring the differential pressure between the high pressure end and the low pressure end of the fluid control valve through the differential pressure sensor arranged at the high pressure end and the low pressure end of the fluid control valve.
Preferably, the differential pressure sensor or the high-pressure and low-pressure sensor adopts a piezoresistive pressure sensor or a capacitive pressure sensor or a piezoelectric pressure sensor.
Preferably, the differential pressure sensor comprises a differential pressure sensing element and a cylindrical shell thereof, and a differential pressure electric signal wire; the left end and the right end of the cylindrical shell are respectively provided with a high-pressure clamping plate and a low-pressure clamping plate, the high-pressure clamping plates and the low-pressure clamping plates are fixed at the front end and the rear end of the cylindrical shell through four bolts, and a high-pressure sensing cavity and a low-pressure sensing cavity are respectively formed between the high-pressure sensing surface and the low-pressure sensing surface of the differential pressure sensing element and the high-pressure clamping plates and the low-pressure clamping plates; the upper end of the cylindrical shell is provided with a groove, a funnel-shaped electronic bin base is arranged in the groove, the micro-processing unit is arranged on the inner bottom surface of the wide mouth part of the electronic bin base, the neck part of the electronic bin base is provided with an inner sealing body, and the differential pressure electric signal wire passes through the inner sealing body from the bottom end of the neck part of the electronic bin base to be led to the micro-processing unit for electric connection; the high-pressure clamp plate and the low-pressure clamp plate are internally provided with a high-pressure channel and a low-pressure channel which are communicated with the high-pressure sensing cavity and the low-pressure sensing cavity respectively, and fluid inlets of the high-pressure channel and the low-pressure channel are respectively arranged on the left end surfaces of the high-pressure clamp plate and the low-pressure clamp plate.
Preferably, the right end surfaces of the high pressure clamping plate and the low pressure clamping plate are respectively provided with a high pressure drain valve and a low pressure drain valve which are communicated with the high pressure sensing cavity and the low pressure sensing cavity.
Preferably, the high-pressure sensor comprises a high-pressure sensing element and a high-pressure lead part which are arranged in the high-pressure clamping plate in the axial direction of the cylindrical shell, wherein the high-pressure lead part comprises a high-pressure electric signal wire and an external high-pressure lead protective shell thereof, and the high-pressure electric signal wire is used for electrically connecting the high-pressure sensing element with the micro-processing unit.
Preferably, the low pressure sensor comprises a low pressure sensing element and a low pressure lead part which are arranged in the low pressure clamping plate in the axial direction of the cylindrical shell, wherein the low pressure lead part comprises a low pressure signal wire electrically connecting the low pressure sensing element with the micro-processing unit and an external low pressure lead protective shell.
Preferably, the right end surfaces of the high pressure clamping plate and the low pressure clamping plate are respectively provided with a high pressure drain valve and a low pressure drain valve which are communicated with the high pressure sensing cavity and the low pressure sensing cavity.
The utility model utilizes a differential pressure sensor arranged at the high and low pressure ends of a fluid control valve and two static pressure sensors (namely high and low pressure sensors) to form a double differential pressure sensor, when the high and low pressure ends of the fluid control valve are monitored to exceed the measuring range of the differential pressure sensors (namely when the differential pressure of the high and low pressure ends of the fluid control valve is large), the differential pressure between the flow rates is measured by adopting the two static pressure sensors arranged at the high and low pressure ends of the fluid control valve; when the high and low pressure ends of the fluid control valve are monitored not to exceed the measuring range of the differential pressure sensor (namely, when the differential pressure between the high and low pressure ends of the fluid control valve is small), the differential pressure of the differential pressure sensor arranged at the high and low pressure ends of the fluid control valve is directly adopted for flow measurement; thus, the problem that the differential pressure measurement accuracy of the differential pressure sensors arranged at the high and low pressure ends of the fluid control valve is low when the differential pressure between the high and low pressure ends of the fluid control valve is large in the prior art is solved, and the problem that the measurement range of the differential pressure measurement flow of the two static pressure sensors arranged at the high and low pressure ends of the fluid control valve is small when the differential pressure between the high and low pressure ends of the fluid control valve is small is solved.
Drawings
FIG. 1 is a schematic diagram of an integrated static pressure and differential pressure detection device in the prior art;
FIG. 2 is a schematic diagram of a dual differential pressure sensor according to the present utility model;
FIG. 3 is a schematic view of A-A cross-sectional structure of the dual differential pressure sensor shown in FIG. 2;
FIG. 4 is a schematic view of a B-B cross-sectional structure of the dual differential pressure sensor shown in FIG. 2;
fig. 5 is a schematic flow chart of a fluid flow measurement method based on a dual differential pressure sensor according to the present utility model.
The reference numerals in the drawings indicate:
1-1 parts of differential pressure sensing elements, 1-2 parts of differential pressure electric signal wires, 1-3 parts of cylindrical shells, 4 parts of low-pressure drain valves, 5 parts of low-pressure clamping plates, 5-1 parts of low-pressure sensing cavities and 5-2 parts of low-pressure channels; 6. the high-pressure drainage valve comprises a high-pressure drainage valve body 8, a high-pressure clamping plate body 8-1, a high-pressure sensing cavity body 8-2, a high-pressure channel 11-1, a low-pressure sensing element 11-2, a low-pressure signal wire 11-3, an outer low-pressure lead wire protection shell body 12-1, a high-pressure sensing element 12-2, a high-pressure signal wire 12-3, an outer high-pressure lead wire protection shell body 13, a micro-processing unit 13-1, an electronic bin base 13-2 and an inner sealing body.
Detailed Description
The following describes the dual differential pressure sensor and the fluid flow measuring method thereof according to the present utility model in detail by referring to the drawings and the embodiments.
As shown in fig. 2 to 4, a schematic structural diagram of a dual differential pressure sensor is provided on a fluid control valve (not shown) through high and low pressure leading-out pipes, and the dual differential pressure sensor includes high and low pressure sensors respectively provided on high and low pressure ends of the fluid control valve, a differential pressure sensor provided on the high and low pressure ends of the fluid control valve, and a microprocessor unit electrically connected to the differential pressure sensor and the differential pressure sensor.
The differential pressure sensor comprises a differential pressure sensing element 1-1 and a cylindrical shell 1-3 thereof, and differential pressure electric signal wires 1-2, wherein the left end and the right end of the cylindrical shell are respectively provided with a high pressure clamping plate 5 and a low pressure clamping plate 8 (the appearance of the high pressure clamping plate and the appearance of the low pressure clamping plate are square cap-shaped) and are fixed at the front end and the rear end of the cylindrical shell through four bolts, and high pressure sensing cavities 8-1 and low pressure sensing cavities 5-1 are respectively formed between the high pressure sensing surface and the low pressure sensing surface of the differential pressure sensing element 1-1 and the high pressure clamping plates 5 and the low pressure sensing cavities 8-1 and 5-1; the upper end of the cylindrical shell 1-3 is provided with a groove, a funnel-shaped electronic bin base 13-1 is arranged in the groove, the micro-processing unit 13 is arranged on the inner bottom surface of the wide mouth part of the electronic bin base, the neck part of the electronic bin base is provided with an inner sealing body 13-2, and the differential pressure electric signal wire 1-2 passes through the inner sealing body from the bottom end of the neck part of the electronic bin base and is led to the micro-processing unit for electric connection; the high-pressure clamping plate and the low-pressure clamping plate are internally provided with high-pressure channels 8-2 and low-pressure channels 5-2 which are communicated with the high-pressure sensing cavity and the low-pressure sensing cavity respectively, and fluid inlets of the high-pressure channels and the low-pressure channels are respectively arranged on the left end surfaces of the high-pressure clamping plate and the low-pressure clamping plate; the right end surfaces of the high-pressure clamping plate and the low-pressure clamping plate are respectively provided with a high-pressure drain valve 6 and a low-pressure drain valve 4 which are communicated with the high-pressure sensing cavity and the low-pressure sensing cavity; the high-pressure sensor comprises a high-pressure sensing element 12-1 and a high-pressure lead part which are arranged in the high-pressure clamping plate in the axial direction of the cylindrical shell, wherein the high-pressure lead part comprises a high-pressure signal wire 12-2 which electrically connects the high-pressure sensing element with the micro-processing unit and a high-pressure lead protective shell 12-3 (comprising a high-pressure sleeve connected with the high-pressure clamping plate 5 and the electronic bin base 13-1 and sealing connection sleeve heads at two ends of the high-pressure sleeve); the low pressure sensor comprises a low pressure sensing element 11-1 and a low pressure lead part which are arranged in the low pressure clamping plate in the axial direction of the cylindrical shell, wherein the low pressure lead part comprises a low pressure electric signal wire 11-2 which electrically connects the low pressure sensing element with the micro-processing unit and a low pressure lead protective shell 11-3 (comprising a low pressure sleeve connected with the low pressure clamping plate 8 and the electronic bin base 13-1 and sealing connection sleeve heads at two ends of the low pressure sleeve).
The micro-processing unit acquires the differential pressure of the fluid control valve or the high-low pressure value in real time through one of the differential pressure sensor and the high-low pressure sensor to calculate a real-time differential pressure value, and performs flow measurement; the micro-processing unit can output measurement data to the outside in real time, and the communication modes comprise RS485 communication, HART communication and the like.
The structure of the double differential pressure sensor is as follows: the differential pressure sensor comprises a differential pressure sensing element 1-1 and a cylindrical shell 1-3 thereof, wherein the left end and the right end of the cylindrical shell are respectively provided with a high-pressure clamping plate and a low-pressure clamping plate 5, 8 (the appearance of the high-pressure clamping plate and the appearance of the low-pressure clamping plate are square-edged cap-shaped) and are fixed at the front end and the rear end of the cylindrical shell through four bolts; therefore, if the high-pressure drain valve and the low-pressure drain valve are not installed, the front-back structure, the left-right structure and the right-left structure of the whole double-differential pressure sensor are symmetrical structures (based on the attached figure 2), the axes of the cylindrical shell of the high-pressure clamp plate and the low-pressure clamp plate are used as rotating shafts, and according to the field construction pipeline and considering the maintenance convenience, the direction of the fluid inlet of the high-pressure channel and the fluid inlet of the low-pressure channel can be flexibly adjusted by 360 degrees, and the fluid inlet of the high-pressure channel and the fluid inlet of the low-pressure channel are communicated with the high-pressure end and the low-pressure end of the control valve through the leading-out pipeline.
The working principle is as follows:
when pressure exists at two ends of the differential pressure sensing element 1-1, the pressure respectively enters the high pressure sensing cavity 8-1 and the low pressure sensing cavity 5-1 through the high pressure channel 8-2 and the low pressure channel 5-2, the fluid pressure respectively extrudes the silicone oil in the high pressure sensing element 12-1, the low pressure sensing element 11-1 and the differential pressure sensing element 1-1 through the high pressure sensing cavity 8-1 and the low pressure sensing cavity 5-1, the silicone oil extrudes the membrane, the membrane deforms to generate capacitance value changes, the capacitance value changes are respectively transmitted to the micro-processing unit 13 through the high pressure signal line, the differential pressure signal line and the differential pressure signal line, the current measured pressure value is calculated through data processing of the micro-processing unit 13 for flow measurement, and the pressure value can also be uploaded to the control center.
As shown in fig. 5, the present utility model further provides a fluid flow measurement method based on a dual differential pressure sensor, including:
the micro-processing unit monitors the differential pressure between the high pressure end and the low pressure end of the fluid control valve in real time by using one of a differential pressure sensor or one of the high pressure sensor and the low pressure sensor arranged at the high pressure end and the low pressure end of the fluid control valve, and judges whether the differential pressure measured value exceeds the range of the differential pressure sensor:
when the measuring range is exceeded, the micro-processing unit measures the difference value between the pressures of the high pressure end and the low pressure end of the fluid control valve through the high pressure sensor and the low pressure sensor arranged at the high pressure end and the low pressure end of the fluid control valve, so that the problem that the fluid flow cannot be measured due to the fact that the measuring range of the differential pressure sensor is small when the differential pressure between the high pressure end and the low pressure end of the control valve is large is solved;
when the measuring range is not exceeded, the micro-processing unit directly measures the flow by measuring the differential pressure between the high pressure end and the low pressure end of the fluid control valve through the differential pressure sensor arranged at the high pressure end and the low pressure end of the fluid control valve, so that the problem that the accuracy of measuring the fluid flow by adopting the high pressure sensor and the low pressure sensor is not high when the differential pressure between the high pressure end and the low pressure end of the control valve is small is solved.
The high-precision double differential pressure sensor, namely the high-precision double differential pressure sensor combined by double static pressure and differential pressure, is integrally designed, and has the advantages of compact structure, accurate measurement, high precision, stable output and high intellectualization; the split type double differential pressure sensor can be designed based on the basic principle structure of the double differential pressure sensor, and is connected to a fluid control valve, so that the measurement accuracy and precision can be reduced.
The pressure difference pressure sensor or the high-pressure and low-pressure sensor can adopt a piezoresistive pressure sensor, a capacitive pressure sensor or a piezoelectric pressure sensor.
The utility model aims to measure the fluid flow of the control valve by combining a double-static pressure sensor with a differential pressure sensor, and effectively solve the problem that the measurement accuracy of the high and low pressure sensors is not high when the differential pressure between the high and low pressure ends of the control valve is small and the problem that the range of the differential pressure sensor is small when the differential pressure between the high and low pressure ends of the control valve is large. The above detailed description of the specific embodiments should not limit the scope of the utility model, but the claims of the scope of the utility model include all the aspects of the utility model, and any changes and modifications fall within the scope of the utility model.
Claims (7)
1. The double differential pressure sensor is arranged on a fluid control valve and is characterized by comprising a high pressure sensor and a low pressure sensor which are respectively arranged at the high pressure end and the low pressure end of the fluid control valve, a differential pressure sensor which is arranged at the high pressure end and the low pressure end of the fluid control valve, and a micro-processing unit which is respectively and electrically connected with the differential pressure sensor and the low pressure sensor.
2. The dual differential pressure sensor of claim 1, wherein the differential pressure sensor or the high and low pressure sensors are piezoresistive or capacitive or piezoelectric pressure sensors.
3. The dual differential pressure sensor of claim 1 or 2, wherein the differential pressure sensor comprises a differential pressure sensing element and a cylindrical housing thereof, a differential pressure electrical signal line; the left end and the right end of the cylindrical shell are respectively provided with a high-pressure clamping plate and a low-pressure clamping plate, the high-pressure clamping plates and the low-pressure clamping plates are fixed at the front end and the rear end of the cylindrical shell through four bolts, and a high-pressure sensing cavity and a low-pressure sensing cavity are respectively formed between the high-pressure sensing surface and the low-pressure sensing surface of the differential pressure sensing element and the high-pressure clamping plates and the low-pressure clamping plates; the upper end of the cylindrical shell is provided with a groove, a funnel-shaped electronic bin base is arranged in the groove, the micro-processing unit is arranged on the inner bottom surface of the wide mouth part of the electronic bin base, the neck part of the electronic bin base is provided with an inner sealing body, and the differential pressure electric signal wire passes through the inner sealing body from the bottom end of the neck part of the electronic bin base and is led to the micro-processing unit for electric connection; the high-pressure clamp plate and the low-pressure clamp plate are internally provided with a high-pressure channel and a low-pressure channel which are communicated with the high-pressure sensing cavity and the low-pressure sensing cavity respectively, and fluid inlets of the high-pressure channel and the low-pressure channel are respectively arranged on the left end surfaces of the high-pressure clamp plate and the low-pressure clamp plate.
4. The double differential pressure sensor according to claim 3, wherein the right end surfaces of the high pressure clamping plate and the low pressure clamping plate are respectively provided with a high pressure drain valve and a low pressure drain valve which are communicated with the high pressure sensing cavity and the low pressure sensing cavity.
5. The dual differential pressure sensor of claim 3, wherein the high pressure sensor comprises a high pressure sensing element and a high pressure lead portion disposed within a high pressure clamp plate in the axial direction of the cylindrical housing, wherein the high pressure lead portion comprises a high pressure electrical signal line electrically connecting the high pressure sensing element with a micro-processing unit and an external high pressure lead protective housing thereof.
6. The dual differential pressure sensor of claim 5, wherein the low pressure sensor comprises a low pressure sensing element and a low pressure lead portion disposed within a low pressure clamp plate in the axial direction of the cylindrical housing, wherein the low pressure lead portion comprises a low pressure electrical signal line electrically connecting the low pressure sensing element with a micro-processing unit and a low pressure lead protective housing external thereto.
7. The double differential pressure sensor according to claim 5 or 6, wherein the right end surfaces of the high pressure clamping plate and the low pressure clamping plate are respectively provided with a high pressure drain valve and a low pressure drain valve which are communicated with the high pressure sensing cavity and the low pressure sensing cavity.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322322403.5U CN220583485U (en) | 2023-08-29 | 2023-08-29 | Double differential pressure sensor |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322322403.5U CN220583485U (en) | 2023-08-29 | 2023-08-29 | Double differential pressure sensor |
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| CN220583485U true CN220583485U (en) | 2024-03-12 |
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| CN202322322403.5U Active CN220583485U (en) | 2023-08-29 | 2023-08-29 | Double differential pressure sensor |
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| CN (1) | CN220583485U (en) |
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