CN209400053U - A kind of micro pressure sensor - Google Patents
A kind of micro pressure sensor Download PDFInfo
- Publication number
- CN209400053U CN209400053U CN201821742446.1U CN201821742446U CN209400053U CN 209400053 U CN209400053 U CN 209400053U CN 201821742446 U CN201821742446 U CN 201821742446U CN 209400053 U CN209400053 U CN 209400053U
- Authority
- CN
- China
- Prior art keywords
- pressure
- strain
- shell
- strain unit
- sheet metal
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
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Abstract
The utility model relates to a kind of pressure sensors, especially a kind of micro pressure sensor, it includes at least: shell, pressure-strain unit, it is characterized in that: the shell is that there are three the metal shells of cavity for band, lowest part is normal pressure cavity, normal pressure cavity, to pressure-strain unit lock chamber, is topmost seal chamber by step transition；Pressure-strain unit is fixed on pressure-strain unit lock chamber, is sealed normal pressure cavity by pressure-strain unit, is had silicone grease glue in uppermost seal chamber, is formed second and seal, pressure-strain unit output lead is drawn from shell.It is for rail transit rolling stock (containing rail vehicles) compressed air air hose leak detection.
Description
Technical field
The utility model relates to a kind of pressure sensor, especially a kind of micro pressure sensor is used for rail traffic machine
Vehicle vehicle (containing rail vehicles) compressed air air hose leak detection.
Background technique
It needs to detect pressure in many fields, it is generally the case that pressure sensor needs the root in pressure change
According to the corresponding pressure signal of size linear convergent rate of pressure, pressure signal is detected will pass through detection circuit, is accordingly controlled
System or detection.In order to obtain with the consistent linear convergent rate of the magnitude numerical value of pressure, pressure sensor can be using many from structure
Compensation, can just obtain linear output value.
However in many cases it is required detection pressure jump signal, if whether the pipeline of water pipe or tracheae is revealed, it is right
The linear change in process of pressure is not relevant for, and is only concerned pressure from normal pressure and is changed to positive pressure or negative pressure, at the same need it is small in size and at
This low, good manufacturability, high reliablity.
Summary of the invention
The purpose of the utility model is to provide a kind of small in size and at low cost, good manufacturability, the micro pressures of high reliablity
Sensor.
The purpose of this utility model is achieved in that a kind of micro pressure sensor, includes at least: shell, pressure are answered
Become unit, it is characterized in that: the shell is band there are three the metal shell of cavity, lowest part is normal pressure cavity, normal pressure cavity
It is topmost seal chamber by step transition to pressure-strain unit lock chamber；Pressure-strain unit is fixed on pressure-strain list
On first lock chamber, normal pressure cavity is sealed by pressure-strain unit, has silicone grease glue in uppermost seal chamber, is formed second
Sealing, pressure-strain unit output lead are drawn from shell.
The shell is the circular strip step lid stamped out by outer cover metal piece.
The shell is the square stamped out by outer cover metal piece or rectangle band step lid.
The pressure-strain unit output lead is drawn from housing bottom by electrode.
The pressure-strain unit includes: sheet metal, resistance strain gage, and there is the pressure of cutting at position to sheet metal in its center
Power deformed area, the outer diameter of sheet metal match with the pressure-strain unit lock chamber, the size and resistance in pressure distortion area
Foil gauge strain regions size matches.
The sheet thicknesses are between 0.05mm-0.15mm.
The sheet metal outer diameter is between 7 mm -11mm.
The sheet thicknesses are between 0.1mm-0.2mm.
The gap in the pressure distortion area and sheet metal is between 0.2mm-0.5 mm.
The working principle of the utility model is: forming three in lid by the way that outer cover metal piece is stamped out band step lid
A cavity, lowest part are normal pressure cavitys, and normal pressure cavity passes through step transition to pressure-strain unit lock chamber, uppermost sealing
Chamber, pressure-strain unit are fixed on pressure-strain unit lock chamber, are sealed normal pressure cavity by pressure-strain unit, most
Seal chamber above has silicone grease glue, forms second and seals；Pressure-strain unit includes: sheet metal, resistance strain gage；Sheet metal
There is the pressure distortion area of cutting at position in its center, and sheet metal outer diameter matches with the pressure-strain unit lock chamber, pressure
The size of power deformed area matches with resistance strain gage strain regions size, and when there is pressure in such external world, pressure acts on silicone grease glue
Outer membrane on, resistance strain gage and pressure distortion area are acted on by outer membrane, pressure distortion area deforms resistance strain gage, change
Resistance-strain sheet resistance values provide the output pressure signal consistent with ambient pressure.
Due to above-mentioned principle and structure can be seen that the utility model have it is small in size, structure is simple, highly reliable spy
Point is particularly suitable for needing to detect pressure jump signal, as whether the pipeline of water pipe or tracheae leaks.
Detailed description of the invention
Below with reference to embodiment attached drawing, the utility model is described in further detail:
Fig. 1 is 1 the schematic diagram of the section structure of the utility model embodiment；
Fig. 2 is 3 structural schematic diagram of the utility model embodiment section pressure-strain unit；
Fig. 3 is 2 the schematic diagram of the section structure of the utility model embodiment.
In figure, 1, shell；2, seal chamber；3, pressure-strain unit；4, silicone grease glue；5, electrode；6, resistance strain gage；7, it presses
Power deformed area；8, outer cover metal piece；9, gap.
Specific embodiment
Embodiment 1
As depicted in figs. 1 and 2, a kind of micro pressure sensor, includes at least: shell 1, pressure-strain unit 3, feature
Be: for the shell 1 with there are three the metal shell 1 of cavity, lowest part is normal pressure cavity, and normal pressure cavity is arrived by step transition
3 lock chamber of pressure-strain unit, uppermost seal chamber 2；Pressure-strain unit 3 is fixed on 3 lock chamber of pressure-strain unit,
Normal pressure cavity is sealed by pressure-strain unit 3, has silicone grease glue 4 in uppermost seal chamber 2, forms second and seal, pressure
3 output lead of stress-strain unit is drawn from shell 1.
The shell 1 is the circular strip step lid stamped out by outer cover metal piece 8.
3 output lead of pressure-strain unit is drawn from 1 bottom of shell by electrode 5.
The pressure-strain unit 3 includes: sheet metal 8, resistance strain gage 6, and there is cutting at position to sheet metal 8 in its center
Pressure distortion area 7,8 outer diameter of sheet metal matches with 3 lock chamber of pressure-strain unit, the size in pressure distortion area 7
Match with 6 strain regions size of resistance strain gage.
8 thickness of sheet metal is between 0.05mm-0.15mm.
8 outer diameter of sheet metal is between 7 mm -11mm.
The thickness of the outer cover metal piece 8 is between 0.1mm-0.2mm.
The gap 9 in the pressure distortion area 7 and sheet metal 8 is between 0.2mm-0.5 mm.
The working principle of the utility model is: forming three in lid by the way that outer cover metal piece 8 is gone out band step lid
Cavity, lowest part are normal pressure cavitys, and normal pressure cavity passes through step transition to 3 lock chamber of pressure-strain unit, uppermost sealing
Chamber 2, pressure-strain unit 3 are fixed on 3 lock chamber of pressure-strain unit, are sealed normal pressure cavity by pressure-strain unit 3,
There is silicone grease glue 4 in uppermost seal chamber 2, forms second and seal.Pressure-strain unit 3 includes: sheet metal 8, resistance-strain
Piece 6, there is the pressure distortion area 7 of cutting at position to sheet metal 8 in its center, and 8 outer diameter of sheet metal and the pressure-strain unit 3 are solid
To determine chamber to match, size and the 6 strain regions size of resistance strain gage in pressure distortion area 7 match, when there is pressure in such external world, pressure
Power acts on the outer membrane of silicone grease glue 4, is acted on resistance strain gage 6 and pressure distortion area 7 by outer membrane, pressure distortion area 7
Resistance strain gage 6 is deformed, changes 6 resistance value of resistance strain gage, provides the output pressure signal consistent with ambient pressure.
Embodiment 2
As shown in figure 3, a kind of micro pressure sensor, includes at least: shell 1, pressure-strain unit 3, it is characterized in that: institute
For the shell 1 stated with there are three the metal shell 1 of cavity, lowest part is normal pressure cavity, and normal pressure cavity passes through step transition to pressure
3 lock chamber of unit, uppermost seal chamber 2 are strained, pressure-strain unit 3 is fixed on 3 lock chamber of pressure-strain unit, passes through
Pressure-strain unit 3 seals normal pressure cavity, has silicone grease glue 4 in uppermost seal chamber 2, forms second and seal, pressure is answered
Become 3 output lead of unit to draw from shell 1.
The shell 1 is the square gone out by outer cover metal piece 8 or rectangle lid with the level.
3 output lead of pressure-strain unit is drawn from 1 bottom of shell by electrode 5.
The pressure-strain unit 3 includes: sheet metal 8, and resistance strain gage 6, there is cutting at position to sheet metal 8 in its center
Pressure distortion area 7,8 outer diameter of sheet metal and shape match with 3 lock chamber of pressure-strain unit, pressure distortion area 7
Size match with 6 strain regions size of resistance strain gage.
8 thickness of sheet metal is between 0.05mm-0.15mm.
8 thickness of outer cover metal piece is between 0.1mm-0.2mm.
The gap 9 in the pressure distortion area 7 and sheet metal 8 is between 0.2mm-0.5 mm.
The working principle of the utility model is: forming three in lid by the way that outer cover metal piece 8 is gone out band step lid
Cavity, lowest part are normal pressure cavitys, and normal pressure cavity passes through step transition to 3 lock chamber of pressure-strain unit, uppermost sealing
Chamber 2, pressure-strain unit 3 are fixed on 3 lock chamber of pressure-strain unit, are sealed normal pressure cavity by pressure-strain unit 3,
There is silicone grease glue 4 in uppermost seal chamber 2, forms second and seal, pressure-strain unit 3 includes: sheet metal 8, resistance-strain
Piece 6, there is the pressure distortion area 7 of cutting at position to sheet metal 8 in its center, and 8 outer diameter of sheet metal and the pressure-strain unit 3 are solid
To determine chamber to match, the size in pressure distortion area 7 matches with 6 strain regions size of resistance strain gage, when there is pressure in such external world, pressure
Power acts on the outer membrane of silicone grease glue 4, acts on resistance strain gage 6 and pressure distortion area 7 by outer membrane, pressure distortion area 7 makes
Resistance strain gage 6 deforms, and changes 6 resistance value of resistance strain gage, provides the output pressure signal consistent with ambient pressure.
Due to above-mentioned principle and structure can be seen that the utility model have it is small in size, structure is simple, highly reliable spy
Point is particularly suitable for needing to detect pressure jump signal, as whether the pipeline of water pipe or tracheae is revealed.
Claims (8)
1. a kind of micro pressure sensor, includes at least: shell (1), pressure-strain unit (3), it is characterized in that: the shell
It (1) is band there are three the metal shell of cavity, lowest part is normal pressure cavity, and normal pressure cavity passes through step transition to pressure-strain list
First lock chamber is topmost seal chamber (2)；Pressure-strain unit (3) is fixed on pressure-strain unit lock chamber, passes through pressure
Strain unit (3) seals normal pressure cavity, has silicone grease glue (4) in uppermost seal chamber (2), forms second and seals, pressure
Unit (3) output lead is strained to draw from shell (1)；The pressure-strain unit (3) includes: sheet metal (8), resistance-strain
Piece (6), there are the pressure distortion area (7) of cutting, the outer diameter of sheet metal (8) and the pressure in position to sheet metal (8) in its center
Strain unit (3) lock chamber matches, and size and resistance strain gage (6) strain regions size of pressure distortion area (7) match.
2. a kind of micro pressure sensor according to claim 1, it is characterized in that: the shell (1) is by shell gold
Belong to the circular strip step lid that piece (8) stamp out.
3. a kind of micro pressure sensor according to claim 1, it is characterized in that: the shell (1) is by shell gold
Belong to the square or rectangle band step lid that piece (8) stamp out.
4. a kind of micro pressure sensor according to claim 1, it is characterized in that: the pressure-strain unit (3) is defeated
Lead is drawn from shell (1) bottom by electrode (5) out.
5. a kind of micro pressure sensor according to claim 1, it is characterized in that: described sheet metal (8) thickness exists
Between 0.05mm-0.15mm.
6. a kind of micro pressure sensor according to claim 5, it is characterized in that: described sheet metal (8) outer diameter is 7
Between mm -11mm.
7. a kind of micro pressure sensor according to claim 1, it is characterized in that: described sheet metal (8) thickness exists
Between 0.1mm-0.2mm.
8. a kind of micro pressure sensor according to claim 1, it is characterized in that: the pressure distortion area (7) and gold
Belong to the gap (9) of piece (8) between 0.2mm-0.5 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821742446.1U CN209400053U (en) | 2018-10-26 | 2018-10-26 | A kind of micro pressure sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821742446.1U CN209400053U (en) | 2018-10-26 | 2018-10-26 | A kind of micro pressure sensor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209400053U true CN209400053U (en) | 2019-09-17 |
Family
ID=67878921
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201821742446.1U Expired - Fee Related CN209400053U (en) | 2018-10-26 | 2018-10-26 | A kind of micro pressure sensor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN209400053U (en) |
-
2018
- 2018-10-26 CN CN201821742446.1U patent/CN209400053U/en not_active Expired - Fee Related
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20190917 Termination date: 20211026 |