CN203241181U - E-shaped beam-type pressure sensor - Google Patents
E-shaped beam-type pressure sensor Download PDFInfo
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- CN203241181U CN203241181U CN 201320268463 CN201320268463U CN203241181U CN 203241181 U CN203241181 U CN 203241181U CN 201320268463 CN201320268463 CN 201320268463 CN 201320268463 U CN201320268463 U CN 201320268463U CN 203241181 U CN203241181 U CN 203241181U
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- stainless steel
- strain
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- twin shaft
- resistor
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Abstract
The utility model discloses an E-shaped beam-type pressure sensor. The E-shaped beam-type pressure sensor comprises stainless steel shells and an E-shaped stainless steel strain beam; the tops of the stainless steel shells are connected with a cover plate; the bottoms of the stainless steel shells are connected with top edges of the E-shaped stainless steel strain beam; the bottom of the E-shaped stainless steel strain beam is used for contacting with an external fluid; a cavity is enclosed by the top of the E-shaped stainless steel strain beam, the inner walls of the stainless steel shells and the inner side of the cover plate; two biaxial electric resistance strain gauges are glued at the top of the E-shaped stainless steel strain beam and are located inside the cavity; and the two biaxial electric resistance strain gauges are electrically connected with each other to form a Wheatstone bridge. When the E-shaped stainless steel strain beam is deformed mechanically under the effect of an external force, the electric resistance value of the strain electric resistance of the biaxial electric resistance strain gauges changes accordingly, such that physical quantity pressure is converted into a corresponding voltage signal, and the voltage signal can accurately reflect the magnitude of the pressure, and therefore, measurement precision can be effectively improved.
Description
Technical field
The utility model relates to a kind of sensor, especially relates to a kind of E type beam type pressure transducer.
Background technology
At present, be used for measuring the common form that adopts the stainless steel isolation diaphragm that fills silicone oil of pressure transducer of fluid, it is the not strain beam of direct contact pressure sensor of fluid, its pressure transmission mode is: the pressure of fluid is passed to the stainless steel isolation diaphragm, the pressure of stainless steel isolation diaphragm impression is passed to silicone oil, the pressure of silicone oil impression is passed to strain beam again, makes strain resistor on the strain beam export a kind of voltage signal of corresponding pressure size.There are the shortcomings such as processing technology is complicated, cost is high, temperature drift is large, trueness error is large in this pressure transducer.
Summary of the invention
Technical problem to be solved in the utility model provide a kind of simple in structure, cost is low, and the high E type beam type pressure transducer of measuring accuracy.
The utility model solves the problems of the technologies described above the technical scheme that adopts: a kind of E type beam type pressure transducer, it is characterized in that comprising Stainless Steel Shell and E type stainless steel strain beam, the top of described Stainless Steel Shell is connected with cover plate, the bottom of described Stainless Steel Shell is connected with the top of described E type stainless steel strain beam, the bottom of described E type stainless steel strain beam is used for the fluid contact with the outside, the top of described E type stainless steel strain beam, the inwall of described Stainless Steel Shell and the inboard of described cover plate surround a cavity, the top of described E type stainless steel strain beam is pasted with two twin shaft resistance strain gages, two described twin shaft resistance strain gages are positioned at described cavity, two described twin shaft resistance strain gages Wheatstone bridge that is electrically connected to form.
Described E type stainless steel strain beam is comprised of stainless steel base and stainless steel beam, the top of described stainless steel base is connected with the bottom of described Stainless Steel Shell, the bottom of described stainless steel beam is used for the fluid contact with the outside, and described stainless steel beam comprises the protruding beam of the circle that circular body and the bottom that is arranged at described body are middle.
The diameter of described body is that 12～18mm, thickness are 0.3～1.5mm; The diameter of described protruding beam is that 0.5～1mm, thickness are 1～2mm.
Two described twin shaft resistance strain gages are pasted on the top of described body by organic glue in the rotational symmetry mode, and spacing 0.5～1mm between the relative side of two described twin shaft resistance strain gages.
Be connected with lead plate on the inwall of described Stainless Steel Shell, described lead plate is positioned at described cavity, the gold ball bonding point of two described twin shaft resistance strain gages is connected with described lead plate, be welded with four extension lines on the described lead plate, an end of described extension line passes described cover plate and leads to the outside.
One of them described twin shaft resistance strain gage comprises the first strain resistor and the second strain resistor, another described twin shaft resistance strain gage comprises the 3rd strain resistor and the 4th strain resistor, the first end of described the first strain resistor is connected with the second end of described the 4th strain resistor by described lead plate, and its public connecting end is connected with a described extension line, the second end of described the first strain resistor is connected with a described extension line by described lead plate with the public connecting end of the first end of described the second strain resistor, the second end of described the second strain resistor is connected with the first end of described the 3rd strain resistor by described lead plate, and its public connecting end is connected with a described extension line, and the second end of described the 3rd strain resistor is connected with a described extension line by described lead plate with the public connecting end of the first end of described the 4th strain resistor.
Be provided with annular groove on the outer wall of described Stainless Steel Shell, be provided with the O RunddichtringO in the described annular groove.
Compared with prior art, the utility model has the advantage of:
1) E type beam type pressure transducer of the present utility model is after processing Stainless Steel Shell and E type stainless steel strain beam, above E type stainless steel strain beam, paste two twin shaft resistance strain gages, again two twin shaft resistance strain gages are connected and composed Wheatstone bridge, so just can measure the pressure of medium, not only simple in structure, cost is low, and owing to adopted the twin shaft resistance strain gage, therefore when producing mechanical deformation under the effect of E type stainless steel strain beam in extraneous power, the resistance value of the strain resistor of twin shaft resistance strain gage can correspondingly change, so just a physical quantity pressure has been converted to corresponding voltage signal, and this voltage signal can reflect the size of pressure accurately, has effectively improved measuring accuracy.
2) E type beam type pressure transducer of the present utility model can be used for the pressure of measurement and the unresponsive medium of stainless steel.
Description of drawings
Fig. 1 is the sectional structure synoptic diagram of E type beam type pressure transducer of the present utility model;
Fig. 2 is the structural representation of the twin shaft resistance strain gage in the E type beam type pressure transducer of the present utility model;
Fig. 3 is the circuit diagram of the Wheatstone bridge that is electrically connected to form of two twin shaft resistance strain gages in the E type beam type pressure transducer of the present utility model;
Fig. 4 a be E type beam type pressure transducer of the present utility model in non-pressurized situation, the position of twin shaft resistance strain gage and wiring schematic diagram;
Fig. 4 b is E type beam type pressure transducer of the present utility model in the situation of pressurization, the position of twin shaft resistance strain gage and wiring schematic diagram.
Embodiment
Embodiment is described in further detail the utility model below in conjunction with accompanying drawing.
A kind of E type beam type pressure transducer that the utility model proposes, as shown in Figure 1, it comprises Stainless Steel Shell 1 and the E type stainless steel strain beam 2 of the equal opening of two axial ends of tubular, the top of Stainless Steel Shell 1 is connected with cover plate 3, the bottom of Stainless Steel Shell 1 is connected with the top of E type stainless steel strain beam 2, the bottom of E type stainless steel strain beam 2 is used for the fluid contact with the outside, the top of E type stainless steel strain beam 2, the inboard of the inwall of Stainless Steel Shell 1 and cover plate 3 surrounds a cavity 4, the top of E type stainless steel strain beam 2 is pasted with two twin shaft resistance strain gages 5, two twin shaft resistance strain gages 5 are positioned at cavity 4, two twin shaft resistance strain gages 5 Wheatstone bridge that is electrically connected to form, be connected with the lead plate 6 of annular on the inwall of Stainless Steel Shell 1, lead plate 6 is positioned at cavity 4, utilize gold ball bonding technique that the gold ball bonding point of two twin shaft resistance strain gages 5 is connected with lead plate 6 by spun gold, be welded with four extension lines 7 on the lead plate 6, one end of extension line 7 passes cover plate 3 and leads to the outside, be provided with annular groove 8 on the outer wall of Stainless Steel Shell 1, be provided with O RunddichtringO 9 in the annular groove 8, Stainless Steel Shell 1 is tightly connected by O RunddichtringO 9 and outside cover body.
In the present embodiment, E type stainless steel strain beam 2 is comprised of stainless steel base 21 and the stainless steel beam 22 of annular, the top of stainless steel base 21 is connected with the bottom of Stainless Steel Shell 1, the bottom of stainless steel beam 22 is used for the fluid contact with the outside, and stainless steel beam 22 comprises the protruding beam 222 of the circle that circular body 221 and the bottom that is arranged at body 221 are middle.At this, requiring the diameter of body 221 is that 12～18mm, thickness are 0.3～1.5mm, the diameter of protruding beam 222 is that 0.5～1mm, thickness are 1～2mm, in actual design process, the diameter of body 221 can be designed to 15mm, thickness is 0.8mm, with the diameter of protruding beam 222 be designed to 0.7mm, thickness is 1.5mm.
In the present embodiment, two twin shaft resistance strain gages 5 are the tops that are pasted on body 221 by existing organic glue in the rotational symmetry mode, and spacing 0.5～1mm between the relative side of two twin shaft resistance strain gages 5 generally makes the spacing between the relative side of two twin shaft resistance strain gages 5 consistent with the diameter of protruding beam 222 in concrete taping process.
In the present embodiment, two twin shaft resistance strain gages 5 are by lead plate 6 Wheatstone bridge that is electrically connected to form, one of them twin shaft resistance strain gage comprises the first strain resistor R1 and the second strain resistor R2, another twin shaft resistance strain gage comprises the 3rd strain resistor R3 and the 4th strain resistor R4, and Fig. 2 has provided the structural representation of first twin shaft resistance strain gage.Such as Fig. 1, Fig. 3, shown in Fig. 4 a and Fig. 4 b, the first end of the first strain resistor R1 is connected with the second end of the 4th strain resistor R4 by lead plate 6, and its public connecting end is connected with first extension line, the second end of the first strain resistor R1 is connected with second extension line by lead plate 6 with the public connecting end of the first end of the second strain resistor R2, the second end of the second strain resistor R2 is connected with the first end of the 3rd strain resistor R3 by lead plate 6, and its public connecting end is connected with the 3rd extension line, and the second end of the 3rd strain resistor R3 is connected with the 4th extension line by lead plate 6 with the public connecting end of the first end of the 4th strain resistor R4.
In the present embodiment, cover plate 3 can adopt existing PCB(Printed Circuit Board) the temperature compensation substrate, can reduce the temperature drift of this E type beam type pressure transducer so effectively; Lead plate 6 adopts existing pcb board; Twin shaft resistance strain gage 5 adopts prior art, is the twin shaft resistance strain gage of BSF350-2BB-T as adopting model.
At this, Stainless Steel Shell and the machine-shaping of E type stainless steel strain beam one.
The principle of work of twin shaft resistance strain gage is conductor or semiconductor material when producing mechanical deformation under the effect of extraneous power, and the resistance value of its strain resistor can corresponding changing, and this phenomenon is called strain effect.The utility model is just according to this strain effect and the uneven output of Wheatstone bridge △ V=(△ R/R) V
BPrinciple, designed this E type beam type pressure transducer.Fig. 4 a has provided this E type beam type pressure transducer in non-pressurized situation, the position of twin shaft resistance strain gage and wiring schematic diagram (not shown Stainless Steel Shell, cover plate, lead plate and extension line); Fig. 4 b has provided this E type beam type pressure transducer in the situation of pressurization (pressure is P), the position of twin shaft resistance strain gage and wiring schematic diagram.From Fig. 4 b, can find out, the pressure P of fluid directly is pressed on the E type stainless steel strain beam, (pressure is larger to make the stainless steel beam of E type stainless steel strain beam produce deformation, then deformation is just larger, otherwise, deformation is just little), form drawing zone and compression zone, and two twin shaft resistance strain gages are responded to the resistance value generation size variation that deformation makes each strain resistor.Because the first strain resistor R1 and the 3rd strain resistor R3 are positioned at drawing zone, the first strain resistor R1 and the 3rd strain resistor R3 elongate, therefore the resistance value R of the first strain resistor R1
1Resistance value R with the 3rd strain resistor R3
3Become large, it is △ R that the first strain resistor R1 produces a resistance value
1Increase resistance, the 3rd strain resistor R
3Producing a resistance value is △ R
3Increase resistance, same the second strain resistor R2 and the 4th strain resistor R4 shorten because the second strain resistor R2 and the 4th strain resistor R4 are positioned at the compression zone, therefore the resistance value R of the second strain resistor R2
2Resistance value R with the 4th strain resistor R4
4Diminish, it is △ R that the second strain resistor R2 produces a resistance value
2Reduce resistance, it is △ R that the 4th strain resistor R4 produces a resistance value
4Reduce resistance.Work as R
1=R
2=R
3=R
4=R and △ R
1=△ R
2=△ R
3=△ R
4During=△ R, the △ V=(△ R/R of Wheatstone bridge output shown in Figure 3) V
B, wherein, △ V represents the voltage added value of corresponding pressure P, △ R is △ R
1, △ R
2, △ R
3Or △ R
4In a value, R is R
1, R
2, R
3Or R
4In a value, V
BThe expression constant pressure source.When the pressure P of fluid strengthens, the compression zone of E type stainless steel strain beam, drawing zone change larger, it is larger to bring (△ R/R) to change, form proportional relationship of △ V of pressure P and Wheatstone bridge output, reached the purpose that a physical quantity pressure P is converted to corresponding voltage signal △ V output.
Claims (7)
1. E type beam type pressure transducer, it is characterized in that comprising Stainless Steel Shell and E type stainless steel strain beam, the top of described Stainless Steel Shell is connected with cover plate, the bottom of described Stainless Steel Shell is connected with the top of described E type stainless steel strain beam, the bottom of described E type stainless steel strain beam is used for the fluid contact with the outside, the top of described E type stainless steel strain beam, the inwall of described Stainless Steel Shell and the inboard of described cover plate surround a cavity, the top of described E type stainless steel strain beam is pasted with two twin shaft resistance strain gages, two described twin shaft resistance strain gages are positioned at described cavity, two described twin shaft resistance strain gages Wheatstone bridge that is electrically connected to form.
2. a kind of E type beam type pressure transducer according to claim 1, it is characterized in that described E type stainless steel strain beam is comprised of stainless steel base and stainless steel beam, the top of described stainless steel base is connected with the bottom of described Stainless Steel Shell, the bottom of described stainless steel beam is used for the fluid contact with the outside, and described stainless steel beam comprises the protruding beam of the circle that circular body and the bottom that is arranged at described body are middle.
3. a kind of E type beam type pressure transducer according to claim 2, the diameter that it is characterized in that described body is that 12～18mm, thickness are 0.3～1.5mm; The diameter of described protruding beam is that 0.5～1mm, thickness are 1～2mm.
4. a kind of E type beam type pressure transducer according to claim 3, it is characterized in that two described twin shaft resistance strain gages are pasted on the top of described body by organic glue in the rotational symmetry mode, and spacing 0.5～1mm between the relative side of two described twin shaft resistance strain gages.
5. each described a kind of E type beam type pressure transducer in 4 according to claim 1, it is characterized in that being connected with lead plate on the inwall of described Stainless Steel Shell, described lead plate is positioned at described cavity, the gold ball bonding point of two described twin shaft resistance strain gages is connected with described lead plate, be welded with four extension lines on the described lead plate, an end of described extension line passes described cover plate and leads to the outside.
6. a kind of E type beam type pressure transducer according to claim 5, it is characterized in that one of them described twin shaft resistance strain gage comprises the first strain resistor and the second strain resistor, another described twin shaft resistance strain gage comprises the 3rd strain resistor and the 4th strain resistor, the first end of described the first strain resistor is connected with the second end of described the 4th strain resistor by described lead plate, and its public connecting end is connected with a described extension line, the second end of described the first strain resistor is connected with a described extension line by described lead plate with the public connecting end of the first end of described the second strain resistor, the second end of described the second strain resistor is connected with the first end of described the 3rd strain resistor by described lead plate, and its public connecting end is connected with a described extension line, and the second end of described the 3rd strain resistor is connected with a described extension line by described lead plate with the public connecting end of the first end of described the 4th strain resistor.
7. a kind of E type beam type pressure transducer according to claim 6 is characterized in that being provided with annular groove on the outer wall of described Stainless Steel Shell, is provided with the O RunddichtringO in the described annular groove.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320268463 CN203241181U (en) | 2013-05-15 | 2013-05-15 | E-shaped beam-type pressure sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320268463 CN203241181U (en) | 2013-05-15 | 2013-05-15 | E-shaped beam-type pressure sensor |
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| Publication Number | Publication Date |
|---|---|
| CN203241181U true CN203241181U (en) | 2013-10-16 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201320268463 Expired - Fee Related CN203241181U (en) | 2013-05-15 | 2013-05-15 | E-shaped beam-type pressure sensor |
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| Country | Link |
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| CN (1) | CN203241181U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103954385A (en) * | 2014-04-30 | 2014-07-30 | 李恒 | Wireless passive rfid stress sensor |
| CN104406724A (en) * | 2014-12-10 | 2015-03-11 | 中国航天空气动力技术研究院 | Force measurement sensor |
| CN113262419A (en) * | 2021-05-28 | 2021-08-17 | 杭州传感器有限公司 | Fire hydrant valve plug, fire fighting system and monitoring method thereof |
-
2013
- 2013-05-15 CN CN 201320268463 patent/CN203241181U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103954385A (en) * | 2014-04-30 | 2014-07-30 | 李恒 | Wireless passive rfid stress sensor |
| CN104406724A (en) * | 2014-12-10 | 2015-03-11 | 中国航天空气动力技术研究院 | Force measurement sensor |
| CN113262419A (en) * | 2021-05-28 | 2021-08-17 | 杭州传感器有限公司 | Fire hydrant valve plug, fire fighting system and monitoring method thereof |
| CN113262419B (en) * | 2021-05-28 | 2022-07-01 | 杭州传感器有限公司 | Fire hydrant valve plug, fire fighting system and monitoring method of fire hydrant valve plug |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20131016 Termination date: 20160515 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |