CN101726386A - Pressure and absolute pressure transducer with overload protection - Google Patents
Pressure and absolute pressure transducer with overload protection Download PDFInfo
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- CN101726386A CN101726386A CN200810201584A CN200810201584A CN101726386A CN 101726386 A CN101726386 A CN 101726386A CN 200810201584 A CN200810201584 A CN 200810201584A CN 200810201584 A CN200810201584 A CN 200810201584A CN 101726386 A CN101726386 A CN 101726386A
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- pressure
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- signal generator
- measuring
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Abstract
The invention relates to a pressure and absolute pressure transducer with overload protection. A measuring diaphragm capable of transmitting pressure is arranged on one side of a chamber. A diaphragm case the volume of which shrinks with the increase of pressure is arranged in the chamber. A pressure signal generator is arranged on the other side of the chamber. A testing end is conducted with the measuring diaphragm through silicon oil of the chamber. During the pressure measuring process, the pressure is transmitted to the pressure signal generator through the measuring diaphragm and the silicon oil, the rigid diaphragm on the diaphragm case which shrinks with the increase of pressure is sunk inwards, resulting in the shrinkage of the volume of the diaphragm case. When the overpressure generates, due to the volume shrinkage of the diaphragm case which shrinks with the increase of pressure, the outside diaphragm and the inner wall of the chamber are overlapped, the silicon oil in the measuring diaphragm is completely pressed into the chamber, and then the higher pressure can not be further transmitted to the pressure signal generator, so the invention avoids generating over-high pressure on the pressure signal generator, and achieves the purpose for protecting the pressure signal generator.
Description
Affiliated technical field
The present invention relates to a kind of pressure, absolute pressure measurement mechanism, especially possess pressure, the absolute pressure sensor of overload protection.
Background technology
At present, known pressure, absolute pressure sensor are made up of chamber, measuring diaphragm and pressure signal generator.The measuring diaphragm pressure that the external world is different is directed to the chamber of sensor, produces pressure, the output of absolute pressure signal by pressure signal generator then.But, a lot of occasions of measuring are owing to the human operational error, or the compression shock and the fluctuation of improper property appear in the pressure piping, and be easy to generate the pressure signal of overpressure far away, absolute pressure sensor testing range, make pressure, absolute pressure sensor be under the pressure overload conditions.General pressure, absolute pressure sensor do not have overload protection function, are easy to cause the sensor signal generator to damage in this occasion, make pressure, absolute pressure sensor owing to the pressure overload stops measuring.
Summary of the invention
In order to overcome existing pressure, the absolute pressure sensor easy deficiency of damaging under the operating mode that the pressure overload takes place; the invention provides a kind of pressure, absolute pressure sensor with overload protection; the pressure of this band overload protection, absolute pressure sensor can not only be measured the force value of field working conditions; and under the situation that the pressure overload takes place, can also carry out self-protection effectively, avoid because the damage that the pressure overload causes.
The technical solution adopted for the present invention to solve the technical problems is: the side at chamber is provided with a measuring diaphragm (measuring junction) that can transmit pressure, being provided with one in chamber interior increases and the bellows of volumetric contraction with pressure, opposite side at chamber is provided with a pressure signal generator, and the test lead of pressure signal generator is by charging silicone oil and the measuring diaphragm conducting in chamber.In the measure field press process, by measuring diaphragm and silicone oil when pressure signal generator transmits pressure and measures pressure, absolute pressure value, the rigid membrance that increases on the bellows that shrinks with pressure also can cave in because of the rising of force value, causes the bellows volumetric contraction.When the overpressure signal generator allows the pressure of working range to occur; increase the bellows that shrinks because the degree that volumetric contraction reduces is enough to make the measuring diaphragm of measuring junction and chamber inner wall to overlap with pressure; thereby make measuring junction silicone oil all catch up with in the chamber; can't further transmit higher force value to pressure signal generator; finally on pressure signal generator, avoid the generation of UHV (ultra-high voltage), realized the purpose of protection pressure signal generator effectively.
The invention has the beneficial effects as follows, can in gaging pressure, absolute pressure, distinguish service pressure, absolute pressure and overload pressure, absolute pressure effectively, increase the bellows that shrinks with pressure and adopt high resiliency metal foil diaphragm to be welded, simple in structure.
Description of drawings
The present invention is further described below in conjunction with drawings and Examples.
Fig. 1 is a structure principle chart of the present invention.
Fig. 2 is the pressure of band overload protection, the fundamental diagram that absolute pressure sensor is implemented overload protection.
1. increase the bellows shrink, 2. silicone oil, 3. measuring diaphragm, 4. pressure signal generator, 5. chamber with pressure among the figure.
Embodiment
In Fig. 1, measuring junction measuring diaphragm (3) by the silicone oil (2) that charges to be arranged on chamber (5) inner increase the test lead transmission pressure of the pressure signal generator (4) of the bellows (1) that shrinks and opposite side with pressure.Along with pressure increases and bellows (1) the pressurized contraction of contraction.Usually the maximum collapse amount that increases the bellows (1) that shrinks with pressure is the silicone oil volume between measuring diaphragm (3) and chamber (5) inwall, and normal temperature descends the force value of this amount of contraction of generation to get this pressure transducer full scale Pm of 2 times usually.Final maximum pressure, the absolute pressure value that realizes being passed to pressure signal generator (5) is controlled in 2 times of measuring range higher limit.
In the embodiment of high pressure overload protection shown in Figure 2; when pressure, absolute pressure overload P 〉=2Pm; measuring diaphragm (3) and chamber (5) inwall overlap; increasing bellows (1) volume that shrinks with pressure simultaneously shrinks; silicone oil (2) in the measuring junction is all caught up with into chamber (5) inside; can't continue finally to reach the purpose of overload protection to the higher pressure of pressure signal generator (4) test lead transmission.
Claims (1)
1. the pressure with overload protection, absolute pressure sensor, its chamber interior are provided with one to be increased with pressure and the bellows of volumetric contraction is provided with a rigid membrance on this bellows.It is characterized in that: rigid membrance is along with the variation of pressure is subjected to displacement, thereby changes this increases the bellows that shrinks with pressure volume.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200810201584A CN101726386A (en) | 2008-10-23 | 2008-10-23 | Pressure and absolute pressure transducer with overload protection |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200810201584A CN101726386A (en) | 2008-10-23 | 2008-10-23 | Pressure and absolute pressure transducer with overload protection |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101726386A true CN101726386A (en) | 2010-06-09 |
Family
ID=42447606
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200810201584A Pending CN101726386A (en) | 2008-10-23 | 2008-10-23 | Pressure and absolute pressure transducer with overload protection |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101726386A (en) |
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 |
| CN103728068A (en) * | 2012-10-11 | 2014-04-16 | 霍尼韦尔国际公司 | Force sensor with mechanical over-force transfer mechanism |
| CN105352654A (en) * | 2015-11-27 | 2016-02-24 | 上海立格仪表有限公司 | High-overload protection pressure measuring instrument |
| CN106124116A (en) * | 2016-07-27 | 2016-11-16 | 安费诺(常州)连接系统有限公司 | For detecting pressure transducer and the method for opposing liquid freezing and expansion pressure thereof of hydraulic pressure |
-
2008
- 2008-10-23 CN CN200810201584A patent/CN101726386A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103728068A (en) * | 2012-10-11 | 2014-04-16 | 霍尼韦尔国际公司 | Force sensor with mechanical over-force transfer mechanism |
| 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 |
| CN105352654A (en) * | 2015-11-27 | 2016-02-24 | 上海立格仪表有限公司 | High-overload protection pressure measuring instrument |
| CN106124116A (en) * | 2016-07-27 | 2016-11-16 | 安费诺(常州)连接系统有限公司 | For detecting pressure transducer and the method for opposing liquid freezing and expansion pressure thereof of hydraulic pressure |
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Legal Events
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| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| DD01 | Delivery of document by public notice |
Addressee: Wang Xujian Document name: Notification of Patent Invention Entering into Substantive Examination Stage |
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| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Open date: 20100609 |