CN202018354U - Overpressure protection pressure and absolute pressure sensor without pressure transfer loss - Google Patents
Overpressure protection pressure and absolute pressure sensor without pressure transfer loss Download PDFInfo
- Publication number
- CN202018354U CN202018354U CN2011200735033U CN201120073503U CN202018354U CN 202018354 U CN202018354 U CN 202018354U CN 2011200735033 U CN2011200735033 U CN 2011200735033U CN 201120073503 U CN201120073503 U CN 201120073503U CN 202018354 U CN202018354 U CN 202018354U
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- pressure
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- chamber
- diaphragm
- signal generator
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Abstract
The utility model discloses an overpressure protection pressure and absolute pressure sensor without pressure transfer loss. A measuring diaphragm is arranged at the lower side of a chamber, a signal generator is arranged at the upper side of the chamber, an annular overpressure protection diaphragm is arranged at the annular surface of the upper side of the chamber, the upper side of the annular overpressure protection diaphragm is provided with an annular chamber, and the annular chamber is provided with an air duct. The dry compressed gas is sealed in the annular chamber through the air duct, and the air pressure is set as 1.5 times working range pressure. The test end of the signal generator is communicated with the measuring diaphragm through silicon oil. In the pressure measuring process, when the pressure is in a normal range, the annular overpressure protection diaphragm pre-compacted by the dry compressed gas is tightly attached to the inner side of the chamber and does not move, the measuring diaphragm does not move, and the pressure is transferred to the internal signal generator without loss; and when overpressure happens, the annular overpressure protection diaphragm moves upwards, so that the silicon oil is totally driven into the chamber, the measuring diaphragm is superposed with the inner wall of the chamber to block the overpressure transfer passage, no pressure transfer loss is realized, and the signal generator is protected.
Description
Affiliated technical field
The utility model relates to a kind of pressure, absolute pressure measurement mechanism, especially possesses pressure and transmits loss-free overvoltage protection pressure, absolute pressure sensor.
Background technology
At present, known pressure, absolute pressure sensor with overvoltage protection is made up of measuring diaphragm, chamber, overvoltage protection spring diaphragm and signal generator.When superpressure takes place; the degree that the overvoltage protection spring diaphragm moves laterally is enough to make measuring diaphragm and chamber inner wall to overlap; thereby make silicone oil all catch up with in the chamber; can't further transmit higher force value to signal generator; finally avoid superpressure to be delivered on the signal generator, realized the purpose of guard signal generator.When but the pressure of this band overvoltage protection, absolute pressure sensor are worked in normally-pressured neighbor; microdisplacement can take place in measuring diaphragm and overvoltage protection diaphragm; pressure is delivered to that partial pressure is cancelled in the signal generator process in the displacement process of measuring diaphragm, pressure loss has taken place.This pressure loss directly influences the linear precision and the temperature compensation performance of pressure, absolute pressure sensor.
Summary of the invention
For the pressure that overcomes existing band overvoltage protection, the deficiency that pressure loss takes place when absolute pressure sensor is worked in normally-pressured neighbor, the utility model provides a kind of overvoltage protection pressure, absolute pressure sensor that does not have the pressure transmission loss.Measuring diaphragm and overvoltage protection diaphragm were not subjected to displacement when this overvoltage protection pressure, absolute pressure sensor were worked in the normal pressure difference scope; Measuring diaphragm and overvoltage protection diaphragm are subjected to displacement and can carry out self-protection effectively when overvoltage takes place, and have avoided because the signal generator that overvoltage causes damages.
The technical scheme that its technical matters that solves the utility model adopts is: sensor comprises measuring diaphragm from bottom to up; silicone oil; chamber; annular overvoltage protection diaphragm; annular compartment; signal generator; measuring diaphragm that can transmit pressure of downside welded seal at chamber; connect a signal generator at the centre position of chamber upside welded seal; one of the ring surface place welded seal of chamber upside is the annular overvoltage protection diaphragm that moves of trace up and down; annular compartment of upside welded seal of annular overvoltage protection diaphragm is provided with a wireway on the annular compartment.By wireway drying compressed gas is potted in the annular compartment; the air pressure of drying compressed gas is set to the workload stroke pressure of 1.5 times of signal generators; then welded seal is adopted in the wireway upper end; chamber top just is provided with the annular compartment of a deposit drying compressed gas like this, and the air pressure of drying compressed gas compresses annular overvoltage protection diaphragm in advance simultaneously.Silicone oil and the measuring diaphragm conducting of the test lead of signal generator by charging in the oil circuit.In the gaging pressure process, when pressure is in normal range, because the effect that compresses in advance of the drying compressed gas air pressure in the annular compartment down, annular overvoltage protection diaphragm is close to the chamber inboard and is not subjected to displacement, make measuring diaphragm also not be subjected to displacement, pressure is by the signal generator transmission to inside of measuring diaphragm and silicone oil, not loss of pressure; When overvoltage takes place when; the thrust that silicone oil produces annular overvoltage protection diaphragm surpasses the snap-in force of drying compressed gas to annular overvoltage protection diaphragm; cause that annular overvoltage protection diaphragm moves up; make silicone oil all catch up with in the chamber; cause measuring diaphragm and chamber inner wall to overlap; can't further transmit higher force value to signal generator, finally avoid overvoltage to be delivered on the signal generator, realize the purpose of no pressure transmission loss and guard signal generator effectively.
The beneficial effects of the utility model are; the design of this pressure, absolute pressure sensor guard signal generator effectively under overpressure situation; the pressure slippages does not take place under the normal pressure situation, embedding drying compressed gas in the annular compartment at the sensor back side, simple in structure.
Description of drawings
Below in conjunction with drawings and Examples the utility model is further specified.
Fig. 1 is a structure principle chart of the present utility model.
Fig. 2 is a fundamental diagram of realizing overvoltage protection.
1. chambers among the figure, 2. annular compartment, 3. signal generator, 4. wireway, 5. annular overvoltage protection diaphragm, 6. silicone oil, 7. measuring diaphragm, 8. drying compressed gas.
Embodiment
In Fig. 1, measuring diaphragm (7) transmits pressure by the silicone oil (6) that charges to the test lead of signal generator (3).Can transmit the measuring diaphragm (7) of pressure at one of the downside welded seal of chamber (1); welded seal connects a signal generator (3) in the middle of chamber (1) upside; one of the upside ring surface place welded seal of chamber (1) is the annular overvoltage protection diaphragm (5) that moves of trace up and down; an annular compartment of upside welded seal (2) of annular overvoltage protection diaphragm (5) is provided with a wireway (4) on the annular compartment (2).By wireway (4) drying compressed gas (8) is potted in the annular compartment (2), the air pressure of drying compressed gas (8) is set to 1.5 times of workload stroke pressures of signal generator (3), then welded seal is adopted in the wireway upper end.In the gaging pressure process; when pressure is in normal range; because under the effect of drying compressed gas (8) air pressure in the annular compartment (2); annular overvoltage protection diaphragm (5) is close to chamber (1) inboard and is not subjected to displacement; make measuring diaphragm (7) also not be subjected to displacement; signal generator (3) to inside transmits not loss of pressure to pressure by measuring diaphragm (7) and silicone oil (6).
In the embodiment of overvoltage protection shown in Figure 2; when pressure P＞1.5Po; the thrust that silicone oil (6) produces annular overvoltage protection diaphragm (5) surpasses the snap-in force of drying compressed gas (8) to annular overvoltage protection diaphragm (5); cause that annular overvoltage protection diaphragm (5) moves up; make silicone oil (6) all catch up with in the chamber; cause measuring diaphragm (7) and chamber (1) inwall to overlap; can't further transmit higher force value to signal generator (3), finally reach the purpose of having protected signal generator under the overpressure situation.
Claims (2)
1. overvoltage protection pressure, absolute pressure sensor that does not have the pressure transmission loss; integral body comprises measuring diaphragm, silicone oil, chamber, annular overvoltage protection diaphragm, annular compartment, signal generator from bottom to up; it is characterized in that: its chamber internal upper part is provided with the annular compartment of a deposit drying compressed gas, and the air pressure of drying compressed gas compresses annular overvoltage protection diaphragm in advance.
2. the overvoltage protection pressure of no pressure transmission loss according to claim 1, absolute pressure sensor is characterized in that: annular compartment top is provided with a wireway, and to annular compartment, welded seal is adopted in the wireway upper end to drying compressed gas by the wireway embedding.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011200735033U CN202018354U (en) | 2011-03-18 | 2011-03-18 | Overpressure protection pressure and absolute pressure sensor without pressure transfer loss |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011200735033U CN202018354U (en) | 2011-03-18 | 2011-03-18 | Overpressure protection pressure and absolute pressure sensor without pressure transfer loss |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202018354U true CN202018354U (en) | 2011-10-26 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011200735033U Expired - Fee Related CN202018354U (en) | 2011-03-18 | 2011-03-18 | Overpressure protection pressure and absolute pressure sensor without pressure transfer loss |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202018354U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103364132A (en) * | 2013-07-25 | 2013-10-23 | 安徽皖科电子工程有限公司 | Pressure sensor with overpressure protective device |
| CN106092427A (en) * | 2016-06-02 | 2016-11-09 | 中国电子科技集团公司第四十九研究所 | The double elastic sensing element of a kind of absolute pressure sensor |
| CN106644244A (en) * | 2016-11-17 | 2017-05-10 | 歌尔股份有限公司 | MEMS pressure sensor |
-
2011
- 2011-03-18 CN CN2011200735033U patent/CN202018354U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103364132A (en) * | 2013-07-25 | 2013-10-23 | 安徽皖科电子工程有限公司 | Pressure sensor with overpressure protective device |
| CN106092427A (en) * | 2016-06-02 | 2016-11-09 | 中国电子科技集团公司第四十九研究所 | The double elastic sensing element of a kind of absolute pressure sensor |
| CN106092427B (en) * | 2016-06-02 | 2018-08-03 | 中国电子科技集团公司第四十九研究所 | A kind of double elastic sensing elements of absolute pressure sensor |
| CN106644244A (en) * | 2016-11-17 | 2017-05-10 | 歌尔股份有限公司 | MEMS pressure sensor |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| DD01 | Delivery of document by public notice |
Addressee: Shanghai Rocksensor Automation Co., Ltd. Document name: Notification to Pay the Fees |
|
| DD01 | Delivery of document by public notice | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20111026 Termination date: 20190318 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |