CN203396538U - Pressure transmitter - Google Patents
Pressure transmitter Download PDFInfo
- Publication number
- CN203396538U CN203396538U CN201320449402.0U CN201320449402U CN203396538U CN 203396538 U CN203396538 U CN 203396538U CN 201320449402 U CN201320449402 U CN 201320449402U CN 203396538 U CN203396538 U CN 203396538U
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- China
- Prior art keywords
- amplifying circuit
- sensitive element
- pressure unit
- voltage signal
- sensing element
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- Pressure Sensors (AREA)
Abstract
The utility model relates to a pressure transmitter, comprising a sensing element and a component of an amplifying circuit. Located in a strain area of the pressure transmitter, the sensing element is used to convert the elastomer deformation caused by the medium pressure to change of a voltage signal. The component of the amplifying circuit is integrated on the sensing element, wherein the amplifying circuit is used to amplify the millivolt voltage signal to a standard voltage signal, which is therefore can be acquired by an acquisition unit. According to the utility model, wires with a weak signal are eliminated, and the component of the amplifying circuit is directly integrated on the sensing element to directly amply the weak signal to a standard signal, so that the interference effect is reduced and the anti-interference ability is improved, and meanwhile the number of components is reduced, thereby decreasing the size and eliminating a PCB board. In addition, due to the integration of the component of the amplifying circuit and the sensing element, a relatively small package structure and relatively low package cost are achieved.
Description
Technical field
The utility model relates to transmitter field, especially relates to a kind of pressure unit.
Background technology
Pressure unit is a kind of sensor the most conventional in industrial practice, it is widely used in various industrial automatic control environment, relates to numerous industries such as water conservancy and hydropower, railway traffic, intelligent building, production automatic control, Aero-Space, military project, petrochemical industry, oil well, electric power, boats and ships, lathe, pipeline.Pressure unit is liquid level, density and the pressure for measuring liquid, gas or steam, then pressure signal is transformed into the output of 4～20mA direct current (Direct Current, DC) signal.
Pressure unit great majority adopt split-type design at present, yet the pressure unit shortcoming of current employing split-type design has a lot: can not make High-current output type, because the heat of High-current output is not easy to distribute, so be generally used as the production of voltage-type; And because the volume of pressure unit is excessive, understand so the fixing cost of build-up of pressure transmitter to printed circuit board (Printed Circuit Board, PCB).And the length that has increased line between weak signal and amplifying circuit, increased the possibility being disturbed, affected the level of Electro Magnetic Compatibility (Electromagnetic Compatibility, EMC).And under strenuous vibration, the possibility that PCB and wire break down strengthens.
Summary of the invention
In order to solve the problems of the technologies described above, the utility model provides a kind of pressure unit.
A kind of pressure unit of the present utility model, comprise: sensitive element and amplifying circuit components and parts, wherein, described sensitive element is positioned at the strain regions of described pressure unit, described sensitive element is the elastic body distortion being caused by pressure medium to be converted into the variation of voltage signal, the components and parts of described amplifying circuit are integrated on described sensitive element, and described amplifying circuit is the voltage signal of millivolt level to be zoomed into the voltage signal of standard, for collector collection.
Further, a kind of pressure unit of the present utility model, also comprises: base of ceramic, described sensitive element and amplifying circuit components and parts are directly attached on ceramic surface.
Further, a kind of pressure transducer of the present utility model, also comprises: on the flexible member of base of ceramic, directly make temperature compensation resistance, zero point and full scale and trim resistance.
Further, a kind of pressure transducer of the present utility model, also comprises: described sensitive element is comprised of four resistance, becomes strain bridge.
Compared with prior art, the beneficial effects of the utility model are: the wire of cancelling weak signal, directly the components and parts of amplifying circuit are integrated on sensitive element, weak signal directly zooms into standard signal, and the one, can reduce the impact of interference, improve antijamming capability, the 2nd, the quantity of minimizing components and parts, had both dwindled volume, had cancelled pcb board, and owing to having realized element and the sensitive element of amplifying circuit, integrate, there is smaller and more exquisite encapsulating structure and packaging cost.In addition, owing to having cancelled the output lead of weak signal, make transmitter reduce the link being disturbed, there is better EMC performance; Due to sensitive element and amplifying circuit integrated, make sensitive element and amplifying circuit in Yi Ge temperature field, no longer include thermograde, reduced the thermograde in real work, increased temperature compensation precision; Better anti-shake performance and reliability.
Accompanying drawing explanation
Fig. 1 is the structural representation of pressure unit of the present utility model.
Embodiment
Below in conjunction with drawings and Examples, embodiment of the present utility model is described in further detail.Following examples are used for illustrating the present invention, but are not used for limiting scope of the present utility model.
As shown in Figure 1, the pressure unit of the present embodiment comprises and trims resistance 1, the circle Yi Nei areal strain district 2 that comprises sensitive element, base of ceramic 3 and amplifying circuit components and parts 4.Components and parts are just directly attached on ceramic surface like this.Peripheral edge in strain regions claims marginarium, has edge effect, can not arrange other elements, but can utilize edge effect to arrange compensating element.Sensitive element in circle is comprised of four resistance, becomes strain bridge, is responsible for the variation of pressure to be converted into electric signal.
Concrete: sensitive element and amplifying circuit components and parts, they have structurally realized integrated, the location arrangements that is to say sensitive element is in strain regions 2, sensitive element is the elastic body distortion being caused by pressure medium to be converted into the variation of voltage signal, the components and parts of amplifying circuit are integrated on sensitive element, amplifying circuit is the voltage signal of millivolt level to be zoomed into the voltage signal of standard, for collector collection, and the components and parts location arrangements Fei strain regions of amplifying circuit, has fully used the area of elastomeric edge effect He Fei strain regions.
The advantage of this patent has: pressure unit also comprises: above-mentioned sensitive element and amplifying circuit components and parts are directly attached on ceramic surface.On ceramic flexible member, directly make temperature compensation resistance, zero point and full scale etc. simultaneously and trim resistance 1, with laser, trim, no longer need to match resistance and welding resistance, thereby realized the robotization that pressure unit is produced.
The advantage of this patent has: the wire of cancelling weak signal, directly the components and parts of amplifying circuit are integrated on sensitive element, weak signal directly zooms into standard signal, the one, can reduce the impact of interference, improve antijamming capability, the 2nd, the quantity (being integrated in sensitive element) of minimizing components and parts, both dwindled volume, cancel pcb board, and integrated owing to having realized element and the sensitive element of amplifying circuit, there is smaller and more exquisite encapsulating structure and packaging cost.In addition, owing to having cancelled the output lead of weak signal, make transmitter reduce the link being disturbed, there is better EMC performance; Due to sensitive element and amplifying circuit integrated, make sensitive element and amplifying circuit in Yi Ge temperature field, no longer include thermograde, reduced the thermograde in real work, increased temperature compensation precision; Better anti-shake performance and reliability.
Above-mentioned pressure unit is well used in air conditioning for automobiles pressure transducer.The one, dwindled volume, the 2nd, EMC has passed through European up-to-date standard, and the 3rd, reliability is improved, and the failure rate in 1 year operating period can reach 50PPM.
The above is only the preferred embodiment of the present invention; it should be pointed out that for those skilled in the art, do not departing under the prerequisite of the technology of the present invention principle; can also make some improvement and modification, these improve and modification also should be considered as protection scope of the present invention.
Claims (4)
1. a pressure unit, it is characterized in that, comprise: sensitive element and amplifying circuit components and parts, wherein, described sensitive element is positioned at the strain regions of described pressure unit, and described sensitive element is the elastic body distortion being caused by pressure medium to be converted into the variation of voltage signal, and the components and parts of described amplifying circuit are integrated on described sensitive element, described amplifying circuit is the voltage signal of millivolt level to be zoomed into the voltage signal of standard, for collector collection.
2. pressure unit according to claim 1, is characterized in that, also comprises: base of ceramic, described sensitive element and amplifying circuit components and parts are directly attached on ceramic surface.
3. pressure unit according to claim 2, is characterized in that, also comprises: on the flexible member of base of ceramic, directly make temperature compensation resistance, zero point and full scale and trim resistance.
4. pressure unit according to claim 1, is characterized in that, also comprises: described sensitive element is comprised of four resistance, becomes strain bridge.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320449402.0U CN203396538U (en) | 2013-07-26 | 2013-07-26 | Pressure transmitter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320449402.0U CN203396538U (en) | 2013-07-26 | 2013-07-26 | Pressure transmitter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203396538U true CN203396538U (en) | 2014-01-15 |
Family
ID=49908062
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320449402.0U Expired - Lifetime CN203396538U (en) | 2013-07-26 | 2013-07-26 | Pressure transmitter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203396538U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109937524A (en) * | 2016-11-16 | 2019-06-25 | 罗伯特·博世有限公司 | Motor |
-
2013
- 2013-07-26 CN CN201320449402.0U patent/CN203396538U/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109937524A (en) * | 2016-11-16 | 2019-06-25 | 罗伯特·博世有限公司 | Motor |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20140115 |
|
| CX01 | Expiry of patent term |