CN202126325U - Switching value differential pressure sensor - Google Patents
Switching value differential pressure sensor Download PDFInfo
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- CN202126325U CN202126325U CN201120180772XU CN201120180772U CN202126325U CN 202126325 U CN202126325 U CN 202126325U CN 201120180772X U CN201120180772X U CN 201120180772XU CN 201120180772 U CN201120180772 U CN 201120180772U CN 202126325 U CN202126325 U CN 202126325U
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- pressure
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- control unit
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Abstract
The utility model relates to a switching value differential pressure sensor which comprises a shell and a signal control unit. An inner cavity of the shell is provided with a high-pressure cavity and a low-pressure cavity, a first pressure sensing membrane is arranged in the high-pressure cavity, a second pressure sensing membrane is arranged in the low-pressure cavity, a connecting rod is arranged between the first pressure sensing membrane and the second pressure sensing membrane, two ends of the connecting rod are respectively adhered on the first pressure sensing membrane and the second pressure sensing membrane, and a pressure value regulating knob is arranged at one of the two ends of the connecting rod; and the signal control unit is arranged in an electronic control cavity of the shell, the signal control unit comprises an induction microswitch connected with a circuit function module, and the circuit function module is connected with a central processing unit ECU (Electronic Control Unit) through a triggering circuit. The switching value differential pressure sensor disclosed by the utility model can precisely collect pressure drop of a fluid passage component, outputs signals which are reliable, simple and easily processed , only needs to output indication signals at the certain point and drives an indication lamp or transmits the signals to the central processing unit ECU; in addition, the signal is stable and simple and is not affected by severe environment.
Description
Technical field
The utility model belongs to and is used for the precaution device that each parts pressure reduction of early warning fluid passage surpasses threshold value, especially a kind of design of each parts pressure reduction early warning sensor of low pressure oil circuit or gas circuit.But parts in the early warning fluid passage because of impurity accumulation or obstruction, cause the parts pressure drop to surpass threshold value, especially are fit to the early warning of automobile industry oil circuit component life.The output signal adopts make-and-break signal and the level signal that makes things convenient for host computer or ECU to detect.
Background technology
Normally used differential pressure pick-up is differential pressure transmitter again, mainly contains capacitance differential pressure cell, ceramic differential pressure pick-up, diffuse si differential pressure pick-up
Capacitance transducer has the sensory package of a variable capacitance. and this sensor is the assembly of a complete closed, and differential pressure passes to pressure-sensitive diaphragm through isolation diaphragm and filling liquid silicone oil and causes displacement. the milliampere level electric signal that the two-wire system that the capacitance difference between pressure-sensitive diaphragm and two capacitor plates is converted to by electronic unit is exported.
Erosion-resisting ceramic pressure sensor does not have the transmission of liquid; Pressure acts directly on the front surface of ceramic diaphragm; Make diaphragm produce small deformation, thick-film resistor is printed on the back side of ceramic diaphragm, connects into a Wheatstone bridge (closing bridge); Because the piezoresistive effect of voltage dependent resistor (VDR), the voltage signal that makes electric bridge produce a highly linear that is directly proportional with pressure, also be directly proportional with driving voltage.
Diffusion silicon pressure sensor; The pressure of measured medium directly acts on the diaphragm of sensor (stainless steel or pottery); Make diaphragm produce the micrometric displacement that is directly proportional with pressure medium; The resistance value of sensor is changed, detect this variation through electronic circuit, and canonical measure signal corresponding to this pressure of conversion output.
The piezoelectric that piezo-electric pressure sensor mainly uses includes quartz, sodium potassium tartrate tetrahydrate and phosphoric acid dihydro amine; Wherein quartzy (silicon dioxide) is a kind of mineral crystal; Piezoelectric effect finds that in this crystal within certain temperature range, piezoelectric properties exist always; But temperature surpasses after this scope, piezoelectric properties complete obiteration (this high temperature is exactly so-called " Curie point ").Because along with the changing electric field of stress changes small (just saying that also piezoelectric modulus is lower), so quartz is substituted by other piezoelectric crystal gradually.And sodium potassium tartrate tetrahydrate has very big piezoelectric susceptibility and piezoelectric modulus, but it can only can be used under the lower environment of room temperature and humidity ratio.
More than be many differential pressure pick-ups of knowing in the prior art, this type of sensor is analog quantity output, generally will gather and secondary development through AD, just can indicate differential pressure value, and because its manufacture craft has determined it to hold at high price; Simultaneously, the easy temperature influence of this type of sensor, and can not satisfy the requirement of some industries.
Summary of the invention
To the problem that exists in the above-mentioned prior art, the purpose of the utility model is to provide a kind of switching value differential pressure pick-up, and it can accurately gather the pressure drop of fluid passage components, exports reliable, simple tractable signal.
The utility model is the technical scheme that its purpose of realization is taked: a kind of switching value differential pressure pick-up; Comprise housing and signaling control unit, it is characterized in that: said housing inner chamber is established high pressure chest and low-pressure cavity, establishes the first pressure sensitive diaphragm in the high pressure chest; Establish the second pressure sensitive diaphragm in the low-pressure cavity; Establish connecting rod between the said first pressure sensitive diaphragm and the second pressure sensitive diaphragm, the connecting rod two ends are attached to respectively on two diaphragms, and a wherein end of said connecting rod is established pressure value adjusting knob; Said signaling control unit is located in the automatically controlled chamber of housing, and signaling control unit comprises the induction microswitch that links to each other with the circuit function module, and the circuit function module is connected with central processing unit ECU through trigger circuit.
The utility model is gathered the high and low pressure end pressure respectively by first and second pressure sensitive diaphragm, and logical overpressure value adjusting knob correction is regulated and set and trigger force value, when pressure reduction reaches setting value; By connecting rod conducting pressure vector, trigger the induction microswitch and calculate pressure reduction, when vector value surpasses threshold value by the circuit function module; Activate trigger circuit; Export tractable high and low level or make-and-break signal, drive peripheral circuit (like pilot lamp, central processing unit ECU).
The beneficial effect of the utility model: can accurately gather the pressure drop of fluid passage components, export reliable, simple tractable signal, only need drive pilot lamp, or pass to central processing unit ECU in certain some output indicator signal, signal stabilization, simple, and not influenced by rugged surroundings.
Description of drawings
Making the enforcement mode below in conjunction with accompanying drawing and tool is described further the utility model.
Fig. 1 is the utility model structural representation;
Fig. 2 is a circuit function module fundamental diagram.
1, the first pressure sensitive diaphragm among the figure, 2, the first pressure sensitive diaphragm, 3, the induction microswitch, 4, trigger circuit, 5, the circuit function module, 6, pressure value adjusting knob, 7, connecting rod.
Embodiment
As shown in Figure 1, the utility model comprises housing and signaling control unit, and housing adopts light materials such as plastics, alloy.Establish high pressure chest and low-pressure cavity in the housing, establish the first pressure sensitive diaphragm 1 in the high pressure chest, establish in the low-pressure cavity between the second pressure sensitive diaphragm, 2, the first pressure sensitive diaphragms 1 and the second pressure sensitive diaphragm 2 and establish connecting rod 7.Owing to have diaphragm and connecting rod to intercept, high pressure chest and low-pressure cavity isolated each other.Connecting rod 7 is the barbell shape, and connecting rod is the boundary with the central point, is divided into symmetrical two-section and combines (also can be divided into two sections by other unsymmetric forms, main consideration will be convenient to install).The disk end at connecting rod two ends is attached to respectively on two diaphragms.A wherein end of connecting rod 7 (end that promptly contacts with the second pressure sensitive diaphragm 2) is established pressure value adjusting knob 6.The first pressure sensitive diaphragm and the second pressure sensitive diaphragm can adopt ceramic diaphragm, silica gel diaphragm or nitrile rubber to add the cloth diaphragm.A kind of scalable switch that pressure value adjusting knob adopts Japanese Omron Corp to produce.
Signaling control unit is arranged in the automatically controlled chamber of housing, and signaling control unit comprises induction microswitch 3, and the induction microswitch is connected with circuit function module 5, and circuit function module 5 is connected through peripheral circuits such as trigger circuit 4 and central processing unit ECU.The induction microswitch is located at the inboard near the connecting rod other end.Trigger circuit 4 adopt and trigger the part structure.Circuit function module principle of work is as shown in Figure 2: after the pressure acquisition signal triggering is collected; Through the predetermined alarming value of master chip analyses and comparison; Whether or being defeated by its signal of interference analysis module analysis then is the wrong signal that causes owing to reasons such as other static of vibration; Through connector formal signal is exported to center ECU outward after analyzing, be shown to the operator by ECU again.
The utility model adopts general pipe adapter and engage thread to connect with pipeline, and the high and low pressure end is isolated mutually, only the conducting pressure vector; Fluid does not pass through from joint and cavity, and logical overpressure value adjusting knob is regulated and revised, and sets and triggers force value; When pressure reduction reaches setting value, trigger the induction microswitch and calculate pressure reduction, when vector value surpasses threshold value by the circuit function module; Activate trigger circuit, and then trigger electronic circuit, export tractable high and low level or make-and-break signal; Drive peripheral circuit, like pilot lamp, ECU.
For strengthening anti-interference and permanance, output short circuit protection circuit and anti-surge circuit design have been adopted in output to circuit.The utility model principle of work: fluid (water, oil or gas) is given the first pressure sensitive diaphragm and the first pressure sensitive diaphragm through high-low pressure end transmission pressure; And pressure collected pass to connecting rod; Will trigger the induction microswitch through connecting rod (adjusting of its predetermined value is regulated by pressure value adjusting knob); It is connected the back and sends trigger pip to the circuit function module; Through circuit analysis comparison predetermined value, exceeding predetermined value will give the automobile central disposal system through electric signal of trigger circuit output, and it is unusual to inform that the operator position occurs.
Claims (4)
1. switching value differential pressure pick-up; Comprise housing and signaling control unit, it is characterized in that: said housing inner chamber is established high pressure chest and low-pressure cavity, establishes the first pressure sensitive diaphragm in the high pressure chest; Establish the second pressure sensitive diaphragm in the low-pressure cavity; Establish connecting rod between the said first pressure sensitive diaphragm and the second pressure sensitive diaphragm, the connecting rod two ends are attached to respectively on two diaphragms, and a wherein end of said connecting rod is established pressure value adjusting knob; Said signaling control unit is located in the automatically controlled chamber of housing, and signaling control unit comprises the induction microswitch that links to each other with the circuit function module, and the circuit function module is connected with central processing unit ECU through trigger circuit.
2. switching value differential pressure pick-up according to claim 1 is characterized in that: said connecting rod is the two-section combined type.
3. switching value differential pressure pick-up according to claim 1 is characterized in that: the said first pressure sensitive diaphragm and the second pressure sensitive diaphragm adopt ceramic diaphragm, silica gel diaphragm or nitrile rubber to add the cloth diaphragm.
4. switching value differential pressure pick-up according to claim 1 is characterized in that: said trigger circuit adopt and trigger the part structure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201120180772XU CN202126325U (en) | 2011-06-01 | 2011-06-01 | Switching value differential pressure sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201120180772XU CN202126325U (en) | 2011-06-01 | 2011-06-01 | Switching value differential pressure sensor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202126325U true CN202126325U (en) | 2012-01-25 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201120180772XU Expired - Fee Related CN202126325U (en) | 2011-06-01 | 2011-06-01 | Switching value differential pressure sensor |
Country Status (1)
| Country | Link |
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| CN (1) | CN202126325U (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102323004A (en) * | 2011-06-01 | 2012-01-18 | 合肥望远电子科技有限公司 | A kind of switching value differential pressure pick-up |
| GB2544336A (en) * | 2015-11-13 | 2017-05-17 | Sonardyne Int Ltd | In-situ pressure sensor bias determination apparatus, subsea sensor node apparatus and method of determining a bias of a pressure sensing apparatus |
| CN106969746A (en) * | 2017-03-20 | 2017-07-21 | 西安星展测控科技股份有限公司 | The hydrostatic level of based single crystal silicon differential pressure pick-up |
| CN115824317A (en) * | 2023-02-16 | 2023-03-21 | 四川新川航空仪器有限责任公司 | Multifunctional sensor |
-
2011
- 2011-06-01 CN CN201120180772XU patent/CN202126325U/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102323004A (en) * | 2011-06-01 | 2012-01-18 | 合肥望远电子科技有限公司 | A kind of switching value differential pressure pick-up |
| GB2544336A (en) * | 2015-11-13 | 2017-05-17 | Sonardyne Int Ltd | In-situ pressure sensor bias determination apparatus, subsea sensor node apparatus and method of determining a bias of a pressure sensing apparatus |
| GB2544336B (en) * | 2015-11-13 | 2020-09-16 | Sonardyne Int Ltd | In-situ pressure sensor bias determination apparatus, subsea sensor node apparatus and method of determining a bias of a pressure sensing apparatus |
| CN106969746A (en) * | 2017-03-20 | 2017-07-21 | 西安星展测控科技股份有限公司 | The hydrostatic level of based single crystal silicon differential pressure pick-up |
| CN106969746B (en) * | 2017-03-20 | 2023-04-07 | 星展测控科技股份有限公司 | Static level gauge based on monocrystalline silicon differential pressure sensor |
| CN115824317A (en) * | 2023-02-16 | 2023-03-21 | 四川新川航空仪器有限责任公司 | Multifunctional sensor |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20120125 Termination date: 20140601 |