CN102445302B - Pressure sensor - Google Patents
Pressure sensor Download PDFInfo
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- CN102445302B CN102445302B CN201010506096.0A CN201010506096A CN102445302B CN 102445302 B CN102445302 B CN 102445302B CN 201010506096 A CN201010506096 A CN 201010506096A CN 102445302 B CN102445302 B CN 102445302B
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- pressure
- cavity
- elastic component
- inlets
- needle
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Abstract
The invention relates to the technical field of sensors and particularly discloses a pressure sensor. The pressure sensor comprises a pressure core body and a sensor base, wherein the pressure core body and the sensor base form a pressure cavity; the sensor base is provided with a pressure inlet communicated with the pressure cavity; and the tested system pressure is communicated with the pressure inlet. The pressure sensor also comprises a pressure protector, the pressure protector is arranged at the pressure inlet; and when the tested system pressure is greater than a preset value, the pressure protector closes the pressure inlet. In the pressure sensor provided by the invention, the pressure protector is arranged at the pressure inlet of the pressure cavity, and when the tested system pressure is greater than the preset value, the pressure protector closes the pressure inlet, so that the test system pressure cannot enter into the pressure cavity, thus the pressure core body is effective protected; and the pressure sensor has the advantages of better durability, better reliability and loner service life.
Description
Technical field
The present invention relates to sensor technical field, particularly relate to a kind of pressure transducer with pressure protecting function.
Background technology
Pressure transducer is a kind of sensor that may be used for tracer liquid or gaseous tension, it specifically has, and measuring accuracy is high, stability is high, anticorrosive, resistance to wear, the advantage such as shock resistance, be widely used in various Industry Control.
Please refer to Fig. 1, Fig. 1 is the structural representation of a kind of typical pressure transducer in prior art.
As shown in Figure 1, this pressure transducer comprises sensor holder 1, O-ring seal 2, pressure core 3, cage ring 4, jump ring 5, housing unit 6, wire harness 7 etc., pressure core 3 is made up of stupalith, it is provided with pressure elements, pressure core 3 and sensor holder 1 mineralization pressure cavity, sensor holder 1 is provided with the pressure inlets be communicated with described pressure cavity, system under test (SUT) pressure can enter in pressure cavity by pressure inlets, pressure acts directly on the front surface of pressure core 3, pressure elements is made to produce miniature deformation, the electric bridge be etched in pressure core 3 is made to produce the electric signal of response, the voltage output signal also output display pressure size of standard is converted into again by modulate circuit.
The maximum pressure that the pressure core 3 be made up of stupalith can bear is breaking pressure, the breaking pressure of pressure core 3 of the prior art can only reach 3 times of specification value usually, when system under test (SUT) produces abnormal, pressure may exceed 3 times even higher of specification value, pressure core 3 can be caused to break and damaged, thus pressure transducer is scrapped and can not continue to use.
Therefore, even if how to research and develop a kind of system under test (SUT) occur becoming the technical barrier that those skilled in the art are urgently to be resolved hurrily by the pressure transducer that abnormal pressure, pressure core still can not be broken.
Summary of the invention
The object of this invention is to provide a kind of pressure transducer with pressure protect, even if abnormal pressure appears in system under test (SUT), the pressure core of this pressure transducer still can not be broken.
In order to solve the problems of the technologies described above; the invention provides a kind of pressure transducer; comprise pressure core, sensor holder; described pressure core and described sensor holder mineralization pressure cavity; described sensor holder is provided with the pressure inlets be communicated with described pressure cavity; system under test (SUT) pressure is communicated with described pressure inlets; also comprise pressure protective device; this pressure protective device is located at described pressure inlets place; when described system under test (SUT) pressure is greater than preset value, pressure protective device will close described pressure inlets.
Preferably, described pressure protective device comprises elastic component, is used to open or close the needle of described pressure inlets, described needle and described pressure inlets are set with, one end that described needle has valve body is positioned at described pressure cavity, the other end is connected with one end of described elastic component, and the other end of described elastic component is fixedly installed; Cavity residing for described elastic component and described pressure cavity are isolated.
Preferably, described pressure inlets place forms shoulder hole, and described needle is connected with described elastic component by piston, and described needle, described piston, described elastic component load in described shoulder hole successively, and described piston side and described shoulder hole fit tightly.
Preferably, also O-ring seal is provided with between described piston side and described shoulder hole.
Preferably, the bottom of described shoulder hole is also provided with plug screw, and described plug screw is sealed by O-ring seal and described shoulder hole.
Preferably, residing for described elastic component, cavity is communicated with air.
Preferably, also comprise the connector be connected with described sensor holder, described connector is communicated with described pressure cavity by pressure piping.
Preferably, described elastic component is spring.
Preferably, described pressure core is made up of stupalith.
Pressure transducer provided by the invention, is provided with pressure protective device at the pressure inlets place of pressure cavity, and when system under test (SUT) pressure is greater than preset value, described pressure protective device, by closing presure import, makes system under test (SUT) pressure to enter in pressure cavity again.
When system under test (SUT) pressure is less than preset value, pressure inlets is in open mode, system under test (SUT) pressure can enter in pressure cavity and act on pressure core, when system under test (SUT) pressure is more than or equal to preset value, pressure protective device is by closing presure import, system under test (SUT) pressure cannot enter in pressure cavity again, system under test (SUT) pressure cannot act on pressure core, pressure core can not be broken under the effect of high pressure, pressure core will not be protected by High Pressure, pressure core is effectively protected, this pressure transducer is more durable, better reliability, longer service life.
In preferred version, described pressure protective device comprises elastic component, is used to open or close the needle of described pressure inlets, described needle and described pressure inlets are set with, one end that described needle has valve body is positioned at described pressure cavity, the other end is connected with one end of described elastic component, and the other end of described elastic component is fixedly installed; Cavity residing for described elastic component is isolated by seal member and described pressure cavity.
When system is less than preset value by measuring pressure, elastic component is in elongation state, and the valve body of needle is positioned at the top of pressure inlets, and pressure inlets is in open mode; When system is greater than preset value by measuring pressure; the pressure of pressure in pressure cavity to the valve body of needle makes elastic component be compressed; until valve body is adjacent to pressure inlets; pressure inlets is made to be in closed condition; system under test (SUT) pressure cannot enter in pressure cavity again; pressure core can not be broken under the effect of high pressure; pressure core will not be protected by High Pressure; time below pressure drop to preset value; the snap-in force of spring is greater than the pressure suffered by valve body of needle; needle will be backed down, and system under test (SUT) pressure will enter in pressure cavity.
The pressure transducer of this structure, when system under test (SUT) pressure high pressure preset value, the pressure inlets of pressure cavity is closed by the valve body of needle, and system under test (SUT) pressure cannot, to pressure core effect, make pressure core be effectively protected.
Accompanying drawing explanation
Fig. 1 is the structural representation of a kind of typical pressure transducer in prior art;
Fig. 2 is the structural representation of a kind of embodiment of pressure transducer provided by the present invention;
Fig. 3 is the structural representation that in Fig. 2, pressure transducer is in closed condition;
Wherein, in Fig. 1-Fig. 3:
Sensor holder 1, pressure inlets 1-1, O-ring seal 2, pressure core 3, cage ring 4, jump ring 5, housing unit 6, wire harness 7, needle 8, pressure piping 9, elastic component 10, piston 11, first O-ring seal 12, plug screw 13, second O-ring seal 14, connector 15.
Embodiment
In order to make those skilled in the art better understand technical scheme of the present invention, below in conjunction with the drawings and specific embodiments, the present invention is described in further detail.
Please refer to Fig. 2, Fig. 2 is the structural representation of a kind of embodiment of pressure transducer provided by the present invention.
As shown in Figure 2, pressure transducer provided by the invention, comprises sensor holder 1, pressure core 3, and pressure core 3 is made for stupalith, and pressure core 3 is provided with pressure elements, core body circuit block, electric bridge etc.; Pressure core 3 and sensor holder 1 mineralization pressure cavity, sensor holder 1 is provided with the pressure inlets 1-1 be communicated with this pressure cavity, system under test (SUT) pressure enters in pressure cavity through pressure inlets 1-1, pressure elements runs into pressure can produce distortion, electric bridge can produce the electric signal of response, then is converted into the voltage output signal of standard by modulate circuit.
Pressure transducer provided by the invention; pressure protective device is provided with at the pressure inlets 1-1 place of pressure cavity; when the pressure in pressure cavity is greater than preset value, described pressure protective device, by closing presure import 1-1, makes system under test (SUT) pressure to enter in pressure cavity again.
When system under test (SUT) pressure is less than preset value; pressure inlets 1-1 is in open mode; system under test (SUT) pressure can enter in pressure cavity and act on pressure core 3; when system under test (SUT) pressure is more than or equal to preset value; pressure protective device is by closing presure import 1-1; system under test (SUT) pressure cannot enter in pressure cavity again; system under test (SUT) pressure cannot act on pressure core 3; pressure core 3 can not be broken under the effect of high pressure, and pressure core 3 will not be protected by High Pressure.This pressure transducer is more durable, better reliability, longer service life.
In a kind of concrete scheme, described pressure protective device comprises needle 8 and elastic component 10, and described needle 8 is for opening and closing pressure inlets 1-1, and elastic component 10 can stretch under the effect of the pressure, and then control needle 8 carries out action; Needle 8 is sleeved in pressure inlets 1-1, one end of needle 8 has valve body, the other end is link, one end that needle 8 has valve body is positioned at pressure cavity, valve body can against the edge of pressure inlets 1-1, valve body can make pressure inlets 1-1 close, and when pressure inlets 1-1 closes, system under test (SUT) pressure cannot enter in pressure cavity again; The link of valve body is connected with one end of elastic component 10, and the other end of elastic component 10 is fixedly installed, and cavity residing for elastic component 10 and pressure cavity are isolated, and system under test (SUT) pressure is communicated with pressure inlets 1-1.
In a kind of concrete embodiment, this pressure transducer also comprises the parts such as O-ring seal 2, cage ring 4, jump ring 5, housing unit 6, wire harness 7, wherein, the parts such as O-ring seal 2, cage ring 4, jump ring 5, housing unit 6, wire harness 7 are prior art, have nothing to do with inventive point of the present invention, be no longer described in detail at this.
When system is less than preset value by measuring pressure, preset value can be 3 times of specification value, and elastic component 10 is in elongation state, and the valve body of needle 8 is positioned at the top of pressure inlets 1-1, and pressure inlets 1-1 is in open mode, when system is greater than preset value by measuring pressure, the pressure of pressure in pressure cavity to the valve body of needle 8 makes elastic component 10 be compressed, until valve body is adjacent to pressure inlets 1-1, pressure inlets 1-1 is made to be in closed condition, as shown in Figure 3, system under test (SUT) pressure cannot enter in pressure cavity again, pressure core 3 can not be broken under the effect of high pressure, pressure core 3 will not be protected by High Pressure, when pressure drop is to when being less than preset value, the snap-in force of spring 10 is greater than the pressure suffered by valve body of needle 8, needle 8 will be backed down, system under test (SUT) pressure will enter in pressure cavity, the pressure detecting system under test (SUT) can be continued.
The pressure transducer of this structure has pressure protecting function; when system under test (SUT) pressure high pressure preset value; the pressure inlets 1-1 of pressure cavity will be closed; system under test (SUT) pressure cannot act on pressure core 3; pressure core 3 is effectively protected, such that pressure transducer is more durable, better reliability, longer service life.
In a kind of concrete scheme, the valve body of needle 8 can for having the metal valve body of some strength, and valve body and pressure inlets 1-1 can form metal hard-sealing; The valve body of needle 8 can also be the soft valve body of rubber-like, and valve body can form soft seal with pressure inlets 1-1, no matter adopts that sealing to be formed, all should in protection scope of the present invention.
In a kind of concrete mode, pressure inlets 1-1 place forms shoulder hole, cavity residing for elastic component 10 is isolated by piston 11 and pressure cavity, needle 8 is connected with elastic component 10 by piston 11, needle 8, piston 11, elastic component 10 load in described shoulder hole successively, side and the described ladder hole wall of piston 11 fit tightly, and cavity residing for elastic component 10 and described pressure cavity can be isolated.
In preferred version, in order to improve the sealing between piston 11 and shoulder hole, better cavity residing for elastic component 10 and pressure cavity being isolated, the first O-ring seal 12 can be provided with between piston 11 side and shoulder hole.
More specifically in scheme, can arrange plug screw 13 in the bottom of shoulder hole, plug screw 13 screws in shoulder hole, and elastic component 10 can against the upper end of plug screw 13, and the cavity between plug screw 13, shoulder hole, piston 11 forms cavity residing for elastic component 10.Plug screw 13 for sealing being set in the bottom of shoulder hole, can preventing system under test (SUT) pressure from entering cavity residing for elastic component 10 from the bottom of shoulder hole.
In preferred version, in order to improve the sealing between plug screw 13 and shoulder hole, better by cavity and system under test (SUT) pressure isolation residing for elastic component 10, the second O-ring seal 14 can be provided with between plug screw 13 side and shoulder hole.
In order to prevent producing the pressure that can act on piston 11 in cavity residing for elastic component 10, when the pressure of build-up of pressure cavity is greater than preset value, pressure in pressure cavity cannot make the valve body closing presure import 1-1 of needle 8, in preferred version, residing for elastic component 10, cavity can be communicated with air, makes the spring 10 in cavity residing for elastic component 10 only be subject to atmospheric effect.
In preferred version, the bottom of sensor holder is also provided with connector 15, connector 15 is communicated with pressure inlets 1-1 by pressure piping 9, connector 15 is for being connected with system under test (SUT), bottom due to the shoulder hole of sensor holder 1 is provided with plug screw 13, the pressure entered in sensor holder through connector 15 can only be communicated with pressure inlets 1-1 by pressure piping 9, and can not enter in shoulder hole.
In concrete scheme, pressure piping 9 can be arranged side by side with shoulder hole, and as shown in Figure 2, pressure piping 9 is communicated with pressure inlets 1-1 by bending structure.
In preferred version, described elastic component 10 is specifically as follows spring, and can be not limited to spring by the elastic component 10 in the present invention, all elastomeric elements with certain elastic deformation amount all can be used as the elastic component 10 in the present invention.
In above-described embodiment; pressure protective device adopts the structure of elastic component, needle; pressure transducer provided by the present invention is not limited thereto a kind of structure; pressure protective device can also for having the structure of detecting unit and valve; detecting unit is located on pressure piping; valve is located at pressure inlets place; when detecting unit detects that system under test (SUT) pressure is greater than preset value; by-pass valve control is closed; make system under test (SUT) pressure to enter in pressure cavity again, this situation also should in protection scope of the present invention.
In above-described embodiment; pressure core is made up of stupalith; above-mentioned pressure transducer is ceramic pressure sensor, and pressure transducer provided by the invention is not limited to ceramic pressure sensor, and all pressure transducers with above-mentioned pressure protective device all should in protection scope of the present invention.
The above is only the description of the preferred implementation of invention; should be understood that; due to the finiteness of literal expression; and objectively there is unlimited concrete structure; for those skilled in the art; under the premise without departing from the principles of the invention, can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (8)
1. a pressure transducer, comprise pressure core, sensor holder, described pressure core and described sensor holder mineralization pressure cavity, described sensor holder is provided with the pressure inlets be communicated with described pressure cavity, and system under test (SUT) pressure is communicated with described pressure inlets, it is characterized in that, also comprise pressure protective device, this pressure protective device is located at described pressure inlets place, and when described system under test (SUT) pressure is greater than preset value, pressure protective device will close described pressure inlets;
Described pressure protective device comprises elastic component, is used to open or close the needle of described pressure inlets, described needle and described pressure inlets are set with, one end that described needle has valve body is positioned at described pressure cavity, the other end is connected with one end of described elastic component, and the other end of described elastic component is fixedly installed; Cavity residing for described elastic component and described pressure cavity are isolated.
2. pressure transducer according to claim 1, it is characterized in that, described pressure inlets place forms shoulder hole, described needle is connected with described elastic component by piston, described needle, described piston, described elastic component load in described shoulder hole successively, and described piston side and described shoulder hole fit tightly.
3. pressure transducer according to claim 2, is characterized in that, is also provided with O-ring seal between described piston side and described shoulder hole.
4. pressure transducer according to claim 2, is characterized in that, the bottom of described shoulder hole is also provided with plug screw, and described plug screw is sealed by O-ring seal and described shoulder hole.
5. pressure transducer according to claim 4, is characterized in that, residing for described elastic component, cavity is communicated with air.
6. pressure transducer according to claim 5, is characterized in that, also comprise the connector be connected with described sensor holder, described connector is communicated with described pressure cavity by pressure piping.
7. pressure transducer according to claim 1, is characterized in that, described elastic component is spring.
8. pressure transducer according to claim 1, is characterized in that, described pressure core is made up of stupalith.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010506096.0A CN102445302B (en) | 2010-09-30 | 2010-09-30 | Pressure sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010506096.0A CN102445302B (en) | 2010-09-30 | 2010-09-30 | Pressure sensor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102445302A CN102445302A (en) | 2012-05-09 |
| CN102445302B true CN102445302B (en) | 2015-07-15 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201010506096.0A Expired - Fee Related CN102445302B (en) | 2010-09-30 | 2010-09-30 | Pressure sensor |
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| Country | Link |
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| CN (1) | CN102445302B (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102013205155B4 (en) * | 2013-03-22 | 2023-05-04 | Robert Bosch Gmbh | Device for fastening a pressure sensor to a carrier plate provided with a pressure channel |
| CN106679854B (en) * | 2016-11-29 | 2020-02-07 | 中国电子科技集团公司第四十八研究所 | Absolute pressure sensor and preparation method thereof |
| CN109141713A (en) * | 2018-08-03 | 2019-01-04 | 柴德维 | A kind of pressure alarm suitable for automobile |
| CN108982005A (en) * | 2018-08-03 | 2018-12-11 | 柴德维 | A kind of pressure alarm of new automobile |
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|---|---|---|---|---|
| CN2316645Y (en) * | 1998-01-12 | 1999-04-28 | 陈爱军 | Pressure sensor |
| CN1287590A (en) * | 1998-10-28 | 2001-03-14 | 奈赤-单体泵股份有限公司 | Drive head for a rotary-driven rod assembly, especially for driving a sand pump |
| EP1431733A1 (en) * | 2002-12-20 | 2004-06-23 | Texas Instruments Incorporated | Hermetic pressure transducer with internal spring contacts |
| US6769308B1 (en) * | 2000-09-22 | 2004-08-03 | Delphi Technologies, Inc. | Low-cost stainless steel pressure sensor assembly for a pneumatic valve |
| CN1614374A (en) * | 2003-11-07 | 2005-05-11 | 株式会社不二工机 | Pressure sensor |
| CN2867325Y (en) * | 2005-09-29 | 2007-02-07 | 宝山钢铁股份有限公司 | Pressure gauge protector |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61237030A (en) * | 1985-04-15 | 1986-10-22 | Takayuki Miyao | Change-over valve mechanism for manometer |
| DE10137327A1 (en) * | 2001-07-31 | 2003-02-13 | Honsberg & Co Kg | Pressure sensor for use in e.g. technical process control, has a simple mechanical mechanism for shutting off the pressure sensor inner chamber and preventing damage to its membrane if there is a sudden pressure increase |
| EP2089684B1 (en) * | 2006-11-22 | 2010-06-09 | Danfoss A/S | A pressure sensor |
| CN201004001Y (en) * | 2006-12-30 | 2008-01-09 | 西安中星测控有限公司 | Pressure transformer of liquid dynamic impact load detection and protection structure |
| CN101339086A (en) * | 2007-07-05 | 2009-01-07 | 上海威尔泰工业自动化股份有限公司 | Pressure sensor possessing high pressure overload protection |
-
2010
- 2010-09-30 CN CN201010506096.0A patent/CN102445302B/en not_active Expired - Fee Related
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2316645Y (en) * | 1998-01-12 | 1999-04-28 | 陈爱军 | Pressure sensor |
| CN1287590A (en) * | 1998-10-28 | 2001-03-14 | 奈赤-单体泵股份有限公司 | Drive head for a rotary-driven rod assembly, especially for driving a sand pump |
| US6769308B1 (en) * | 2000-09-22 | 2004-08-03 | Delphi Technologies, Inc. | Low-cost stainless steel pressure sensor assembly for a pneumatic valve |
| EP1431733A1 (en) * | 2002-12-20 | 2004-06-23 | Texas Instruments Incorporated | Hermetic pressure transducer with internal spring contacts |
| CN1614374A (en) * | 2003-11-07 | 2005-05-11 | 株式会社不二工机 | Pressure sensor |
| CN2867325Y (en) * | 2005-09-29 | 2007-02-07 | 宝山钢铁股份有限公司 | Pressure gauge protector |
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| Publication number | Publication date |
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| CN102445302A (en) | 2012-05-09 |
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Effective date of registration: 20170221 Address after: 312500 Zhejiang city of Shaoxing province Xinchang County Chengguan town of Liquan Patentee after: Sanhua Refrigeration Group Co., Ltd., Zhejang Address before: 312500 Liquan village of Zhejiang County in Xinchang Province town under Patentee before: Zhejiang Sanhua Group Co., Ltd. |
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Granted publication date: 20150715 Termination date: 20190930 |