CN207703389U - A kind of pressure transmitter for being adapted to environment temperature and frequently changing - Google Patents
A kind of pressure transmitter for being adapted to environment temperature and frequently changing Download PDFInfo
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- CN207703389U CN207703389U CN201820105756.6U CN201820105756U CN207703389U CN 207703389 U CN207703389 U CN 207703389U CN 201820105756 U CN201820105756 U CN 201820105756U CN 207703389 U CN207703389 U CN 207703389U
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Abstract
The utility model discloses a kind of pressure transmitter for being adapted to environment temperature and frequently changing, including steel tube body, the sensor and transmission circuit that are encapsulated in steel tube body, and the pressure guiding pipe that is packaged on steel pipe inner sensor.Wherein, steel tube body is made of the double-layer pipe that middle layer is vacuum layer.Air guide transmission cable mechanism is provided on double-layer pipe.Air guide transmission cable mechanism includes the fixed seat being equipped on double-layer pipe, gas-guide tube be connected to the pressure guiding pipe inside double-layer pipe is equipped in fixed seat, in fixed seat equipped with the core that is connected inside double-layer pipe, and in core and gas-guide tube outer layer covers have the external protection of heat preservation and insulation function.The utility model has the effect of measuring pressure transmitter stable output signal and structure durable.
Description
Technical field
The utility model belongs in liquid storage link the apparatus field for measuring liquid, more particularly to a kind of to be applied to beer, ox
The pressure transmitter that environment temperature frequently changes is adapted in the liquids processing site such as milk.
Background technology
Currently, applied to environment temperature and measuring in the occasion that medium temperature frequently changes, the pressure transmitter of use
Mainly spread silicon hygiene-type pressure transmitter.This is a kind of more special work condition environment, can all occur daily 0~5 DEG C, 50
DEG C, 0~5 DEG C, 50 DEG C repetition variation thermal fields, and scene humidity it is very big, diffusion silicon hygiene-type pressure transmitter be
Make have temperature compensation function, but is also difficult to ensure output accuracy under this work condition environment.The operating temperature at scene frequently becomes simultaneously
Change, and ambient humidity is again very big, the inner cavity for easily leading to pressure transmitter generates condensed water, causes the pressure guiding pipe of internal diffusion silicon
The problem of blocking or the output of short-circuit fault of circuit board and pressure transmitter are not allowed even to damage.
This kind of pressure transmitter (as shown in Figure 1) used at present encapsulates mainly by the steel pipe of single layer in steel pipe
Sensor and circuit board group at.Wherein there is a pressure guiding pipe on the sensor inside pressure transmitter, effect is and air
It communicates, the measurement pressure energy of sensor is made directly to be compared with atmospheric pressure.Pressure guiding pipe be it is straight-through be packaged in steel pipe inner chamber, and by with
There are gaps for core in the cable of fastener for connection, carry out gas exchanges with the external world later.Due to the internal diameter and cable of pressure guiding pipe
Core gap is very small in line, if condensed water occur in these regions, will completely cut off sensor and carry out gas friendship with external environment
It changes, therefore the measurement pressure of sensor can only be compared with the sealed pressure of steel duct, rather than compare with atmospheric pressure.
Thus, which sealing pressure inside pressure transmitter is because temperature constantly changes, pressure is also constantly to change, and is joined by measuring pressure
Examine the signal inaccuracy that value (pressure transmitter internal sealing pressure) is also unstable, and pressure transmitter can be caused to export.In addition, envelope
Once there is condensed water in the component of dress steel pipe inner chamber, and internal board failure rate can be promoted suddenly.
Utility model content
In view of the above problems, the purpose of this utility model is to provide a kind of measurement pressure transmitter stable output signal and
The pressure transmitter for being adapted to environment temperature and frequently changing of structure durable.
To achieve the above object, a kind of pressure inverting for being adapted to environment temperature and frequently changing provided by the utility model
Device, including steel tube body, the sensor and transmission circuit that are encapsulated in steel tube body, and the impulse that is packaged on steel pipe inner sensor
Pipe.Wherein, steel tube body is made of the double-layer pipe that middle layer is vacuum layer.Air guide transmission cable machine is provided on double-layer pipe
Structure.Air guide transmission cable mechanism includes the fixed seat being equipped on double-layer pipe, be equipped in fixed seat with inside double-layer pipe
Pressure guiding pipe connection gas-guide tube, be equipped in fixed seat with the conducting wire that is connected inside double-layer pipe, and in conducting wire and gas-guide tube
Outer layer covers have the external protection of heat preservation and insulation function.
In some embodiments, it is provided with damp-proof treatment device in air guide pipe end.
In some embodiments, damp-proof treatment device includes that the protective cap with venthole is equipped in air guide pipe end,
And the moisture-proof element being equipped on gas-guide tube position corresponding with venthole in protective cap.
In some embodiments, transmission circuit is the intelligent transfer circuit protected through encapsulating.
The utility model has the beneficial effects that having the effect of measuring pressure transmitter stable output signal and structure durable.
Due to steel tube body be middle layer be vacuum layer double-layer pipe, using vacuum layer to sensor and circuit board carry out protection and
It is encapsulated, that is, using vacuum layer that the internal elements such as sensor, the circuit board of pressure transmitter and external environment are complete
Isolation.Purpose is that effectively the influence that external temperature environment is mutated to pressure transmitter internal temperature environment is minimized, and is carried
High measurement pressure transmitter stable output signal.Again since cable uses the cable tail with gas-guide tube instead, cable insulation is adopted
With thicker thermal insulation material, outside diameter of cable 7.3mm.Cable is by groups such as conducting wire, gas-guide tube, insulating layer, shielded layer and reinforcing ribs
At.In addition, being equipped with moisture-proof element in the cable tail end with gas-guide tube and internal pressure guiding pipe.Moisture-proof element can play
Moisture-proof ventilative effect, it can be ensured that be chronically at drying regime inside pressure transmitter, exempt to have kept away in product to the maximum extent
The appearance of portion's condensed water, can extend its working life, at the same sensor can under the help of unobstructed pressure guiding pipe, can in time with outside
Boundary's atmospheric pressure does difference comparison, enables more accurately to reflect pressure (or liquid level) numerical value at that time.It avoids in the prior art
The problem of board failure rate can be promoted suddenly caused by there is condensed water realizes the purpose of structure durable.Due also to pressure
Transmitter is used with the intelligent transfer circuit for supporting HART protocol.Intelligent transfer circuit can be by acquiring front end sensors output
MV voltage signals corresponding with the pressure being subject to, carry out linearisation calibration, temperature-compensating, signal amplification etc. at digitlizations
Reason, and according to signal 4-20mA, 0-5VDC or 0-10VDC of standard according to pressure value output in direct ratio.Intelligent transfer circuit
Carry out three proofings processing, ensure circuit board can normal work.
Description of the drawings
Fig. 1 is the internal structure schematic diagram of the prior art；
Fig. 2 is the internal structure schematic diagram of the utility model；
Fig. 3 is the structural schematic diagram of air guide transmission cable mechanism in the utility model.
Fig. 4 is the structural schematic diagram of damp-proof treatment device in the utility model.
Specific implementation mode
Utility model is described in further detail below in conjunction with the accompanying drawings.
As shown in Figs 1-4, a kind of pressure transmitter for being adapted to environment temperature and frequently changing, including steel tube body, in steel pipe
The sensor 2 and transmission circuit 3 encapsulated in vivo, and the pressure guiding pipe 4 that is packaged on steel pipe inner sensor 2.Steel tube body is by middle layer
It is formed for the double-layer pipe 1 of vacuum layer.Air guide transmission cable mechanism 5 is provided on double-layer pipe 1.Air guide transmission cable mechanism 5
Include the fixed seat 51 being equipped on double-layer pipe 1, in fixed seat 51 be equipped be connected to the pressure guiding pipe 4 inside double-layer pipe 1
Gas-guide tube 52, be equipped in fixed seat 51 with the conducting wire 53 that is connected inside double-layer pipe 1, and outside conducting wire 53 and gas-guide tube 52
Layer is enclosed with the external protection 54 of heat preservation and insulation function.Gas-guide tube is provided with damp-proof treatment device 6 on 52 end.Damp-proof treatment
Device 6 include the protective cap 62 with venthole 61 is equipped on 52 end of gas-guide tube, and in protective cap 62 gas-guide tube 52 with it is logical
The moisture-proof element 63 that 61 corresponding position of stomata is equipped with.Transmission circuit 3 is the intelligent transfer circuit protected through encapsulating.
In application, sensor 2 and circuit board are protected and be encapsulated using vacuum layer, that is, utilize vacuum layer
The internal elements such as the sensor 2 of pressure transmitter, circuit board and external environment are completely isolated.Purpose is effectively extraneous temperature
It spends influence of the environmental catastrophe to pressure transmitter internal temperature environment to minimize, it is steady to improve measurement pressure transmitter output signal
It is fixed.Cable uses the cable tail with gas-guide tube 52 instead, and cable insulation is using thicker thermal insulation material, the outside diameter of cable
7.3mm.Cable is made of conducting wire 53, gas-guide tube 52, insulating layer, shielded layer and reinforcing rib etc..In addition, in the electricity with gas-guide tube 52
Cable lead terminal is equipped with moisture-proof element 63 with internal pressure guiding pipe 4.Moisture-proof element 63 can play moisture-proof ventilative effect, energy
Enough ensure to be chronically at drying regime inside pressure transmitter, exempts from the appearance for having kept away interiors of products condensed water, energy to the maximum extent
Extend its working life, while sensor 2 can do difference with external atmosphere pressure in time under the help of unobstructed pressure guiding pipe 4
It compares, enables more accurately to reflect pressure (or liquid level) numerical value at that time.It avoids and is made in the prior art because there is condensed water
The problem of being promoted suddenly at board failure rate.Pressure transmitter is used with the intelligent transfer circuit for supporting HART protocol.Intelligence
The mV voltage signals corresponding with the pressure being subject to that energy transmission circuit can be exported by acquiring front end sensors 2, into line
Property the digitized processings such as calibration, temperature-compensating, signal amplification, and according to 4~20mA of signal, the 0~5VDC of standard or 0~
10VDC is according to pressure value output in direct ratio.Intelligent transfer circuit carry out three proofings processing, ensure circuit board can normal work
Make.
The sensor 2 of pressure transmitter is using the sensor for spreading silicon formula, according to needing using 316L, tantalum for measurement medium
Or Hastelloy is as the pressure-sensitive diaphragm material with physical contact between media.After sensor 2 experiences pressure, Wheatstone bridge is utilized
Principle is directly proportional to the pressure the mV signals of example to intelligent transfer circuit output.
After the completion of exploitation, a set of temperature sensor was once respectively placed in finished product and common product and carries out Contrast on effect.At
Product and common product, which are equally positioned in a high-low temperature chamber, carries out high/low temperature alternation experiment.High-low temperature chamber is set as -5 DEG C and 60
It DEG C constantly repeats alternately to change, be heated up or the operation that cools down after two temperature spot constant temperature half an hour of height.Built-in temperature
Sensor shows that the temperature change of the utility model finished product is more stable, and the amplitude of temperature change is common product variations width
/ 10th of degree.Output signal when zero pressure is most to reflect the temperature drift performance of product, the utility model finished product it is complete
Temperature section output accuracy is higher than 0.1%F.S., commonly uses product after temperature alternating is multiple, output accuracy can only reach reluctantly
0.5%F.S..
Above-described is only some embodiments of the utility model.For those of ordinary skill in the art,
Without departing from the concept of the present invention, various modifications and improvements can be made, these belong to practical new
The protection domain of type.
Claims (4)
1. a kind of pressure transmitter for being adapted to environment temperature and frequently changing, including steel tube body, the sensing that is encapsulated in steel tube body
Device and transmission circuit, and the pressure guiding pipe that is packaged on steel pipe inner sensor, which is characterized in that the steel tube body is by middle layer
The double-layer pipe of vacuum layer forms；
Air guide transmission cable mechanism is provided on the double-layer pipe；
The air guide transmission cable mechanism includes the fixed seat being equipped on double-layer pipe, is equipped in fixed seat and clad steel
The gas-guide tube of pressure guiding pipe connection inside pipe, be equipped in fixed seat with the conducting wire that is connected inside double-layer pipe, and in conducting wire and
Gas-guide tube outer layer covers have the external protection of heat preservation and insulation function.
2. a kind of pressure transmitter for being adapted to environment temperature and frequently changing according to claim 1, which is characterized in that institute
It is provided with damp-proof treatment device in the air guide pipe end stated.
3. a kind of pressure transmitter for being adapted to environment temperature and frequently changing according to claim 2, which is characterized in that institute
The damp-proof treatment device stated include the protective cap with venthole is equipped in air guide pipe end, and in protective cap gas-guide tube with it is logical
The moisture-proof element that the corresponding position of stomata is equipped with.
4. a kind of pressure transmitter for being adapted to environment temperature and frequently changing according to claim 1 or 2 or 3, feature
It is, the transmission circuit is the intelligent transfer circuit protected through encapsulating.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820105756.6U CN207703389U (en) | 2018-01-20 | 2018-01-20 | A kind of pressure transmitter for being adapted to environment temperature and frequently changing |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820105756.6U CN207703389U (en) | 2018-01-20 | 2018-01-20 | A kind of pressure transmitter for being adapted to environment temperature and frequently changing |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207703389U true CN207703389U (en) | 2018-08-07 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201820105756.6U Active CN207703389U (en) | 2018-01-20 | 2018-01-20 | A kind of pressure transmitter for being adapted to environment temperature and frequently changing |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110715764A (en) * | 2019-10-24 | 2020-01-21 | 中互电气(江苏)有限公司 | Sensor with strong moisture-proof capability |
-
2018
- 2018-01-20 CN CN201820105756.6U patent/CN207703389U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110715764A (en) * | 2019-10-24 | 2020-01-21 | 中互电气(江苏)有限公司 | Sensor with strong moisture-proof capability |
| CN110715764B (en) * | 2019-10-24 | 2021-05-25 | 中互电气(江苏)有限公司 | Sensor with strong moisture-proof capability |
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CP02 | Change in the address of a patent holder |
Address after: 510000 room 2, 3 building, 5 mu Po East Road, Tianhe District, Guangzhou, Guangdong, B Patentee after: Guangzhou pie Sheng Industrial Technology Co., Ltd. Address before: 510000 C06, four / F, Zhong Xi building, 306 Jiefang Middle Road, Yuexiu District, Guangzhou, Guangdong. Patentee before: Guangzhou pie Sheng Industrial Technology Co., Ltd. |
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| CP02 | Change in the address of a patent holder |