CN209372179U - A kind of water proof type throw-in type pressure sensor - Google Patents
A kind of water proof type throw-in type pressure sensor Download PDFInfo
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- CN209372179U CN209372179U CN201920120942.1U CN201920120942U CN209372179U CN 209372179 U CN209372179 U CN 209372179U CN 201920120942 U CN201920120942 U CN 201920120942U CN 209372179 U CN209372179 U CN 209372179U
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- guide tube
- gas
- cable
- pressure sensor
- solenoid valve
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Abstract
The utility model discloses a kind of water proof type throw-in type pressure sensors, including waterproof case, solenoid valve, atmosphere gas-guide tube, pressure sensor, first connecting cable, meet water monitoring module and the second connecting cable, first connecting cable includes the first connecting line and cable gas-guide tube, second connecting cable includes the second connecting line and control line, solenoid valve is arranged in waterproof case, the both ends of solenoid valve are connect with atmosphere gas-guide tube and cable gas-guide tube respectively, the other end of atmosphere gas-guide tube is connected to ambient atmos, the other end of cable gas-guide tube is connected with the negative pressure cavity of pressure sensor, the both ends of first connecting line are connect with pressure sensor and the second connecting line respectively, second connecting line is also connect with chance water monitoring module, the control terminal of control line and solenoid valve is electrically connected；The water proof type throw-in type pressure sensor uses the on-off of solenoid valve control cable gas-guide tube and atmosphere gas-guide tube and ambient atmos, should meet air guide requirement, reach good water-proof function.
Description
Technical field
The utility model relates to level measuring field more particularly to a kind of water proof type throw-in type pressure sensors.
Background technique
With the continuous prosperity of China's economy, urban development is maked rapid progress, and the construction of big and medium-sized cities is in high speed of advancing by leaps and bounds
Development, urban agglomeration is also constantly expanding.It will appear various underground pipings in urban construction, than following storm sewer, underground sewage tube
Road, water supply pipe etc., these pipelines have the inspection shaft for leading to ground every a distance, and catch pit port is usually flat with ground
Together, and with inspection well cover it covers.
Level measuring is a basic work of urban water affairs, with science and technology progress, level measuring gradually by
Artificial observation switchs to automatic monitoring, and water level automatic monitoring is exactly to pass through water level sensor to cooperate some data acquisitions again, pass
The devices such as defeated, storage realize the automatic monitoring of water level.
Throw-in type pressure sensor is also referred to as static pressure type liquid level sensor, a kind of pressure sensing measuring liquid level (depth)
Device, is extension and development to pressure transmitter technical application, it is linear based on surveyed fluid pressure and the liquid height
The principle of relationship spreads silicon-sensitive element or ceramic capacitive pressure sensitive sensor using isolated form, the static pressure of liquid is converted
For electric signal, using linear amendment and temperature-compensating, be converted into 4-20mA current analog signal, 0-5V voltage analog signal,
Or 485 differential digital signal output.The Sensor section (sensor head) of throw-in type liquid transmitter can be directly thrown by
It surveys in medium, transducer portion can be fixed with flange or bracket, be installed and used extremely convenient.
Static pressure measurement principle and calculation formula: when throw-in type pressure sensor puts into a certain depth in fluid to be measured,
The pressure formula that throw-in type pressure sensor contacts face is subject to are as follows: P=ρ × g × h+P0, wherein P is throw-in type pressure sensor
Pressure suffered by contact surface, ρ are fluid to be measured density, and g is local gravitational acceleration, and P0 is on throw-in type pressure sensor liquid level
Atmospheric pressure, h are the depth that throw-in type pressure sensor puts into liquid.
The pressure of liquid is introduced into the positive pressure chamber of sensor by throw-in type pressure sensor tracting pressuring hole, while by liquid level
On atmospheric pressure P0 be connected with the negative pressure cavity of throw-in type pressure sensor, to offset the P0 at the throw-in type pressure sensor back side,
So that throw-in type pressure sensor is measured pressure ρ × g × h, by measure liquid pressure P, available and liquid pressure at
The liquid level depth of linear relationship: level value.Throw-in type pressure sensor is due to stability is good, precision is high, range is big, installation
The convenient, advantages such as civilwork engineering quantity is small, price is low, in the level measuring for using inspection shaft more and more widely.
In recent years, the city tunnel as caused by heavy rainfall, under viaduct, a large amount of ponding in low-lying section the phenomenon that when have
Occur, some places are repeatedly flooded for 1 year, and inspection shaft therein is flooded by rainwater, and has the tendency that growing in intensity.Rainy
Shelter in South China Cities, some fishing point ponding are up to several meters, cannot drain in time in the short time, cause some equipment water inlets that can not make
With: it is such as installed on the throw-in type pressure sensor of inspection shaft among road, since construction is inconvenient, will not generally dig road surface for RTU
In (remote-terminal unit) and cable (band gas-guide tube) suspension upright bar, it will be installed on inspection shaft inner wall nearby, due to throw-in type pressure
Force snesor cable needs to be connected to ambient atmosphere there are gas port, and the atmospheric pressure on liquid level is connected with the negative pressure cavity of sensor,
With the atmospheric pressure at the offset sensor back side, to improve measurement accuracy, once rainwater floods gas port, rainwater along gas port pipe into
Enter inside equipment, the original shorted devices such as chip are burnt out, and cause throw-in type pressure sensor that can not reuse.
If considering anti-hydric factor, gas-guide tube is blocked, then according to The Ideal-Gas Equation, (p refers to ideal to pV=nRT
The pressure of gas, V are the volume of perfect gas, and n indicates the amount of gaseous matter, and T then indicates the thermodynamic temperature of perfect gas, R
For ideal gas constant)；In identical volume, pressure p and temperature T direct proportionality illustrate that throw-in type pressure passes
Sensor is affected by temperature: the liquid very big for measurement temperature change, air guide intraductal pressure p are also greatly affected, do below
Concrete analysis.
Gas-guide tube blocks scheme: assuming that cable length is 10m, the diameter of gas-guide tube is 1mm (volume 7.85cm3), throw
Enter formula pressure sensor cavity internal gas volume 1cm3, temperature T=300K；If measuring liquid depth 10m, fluid temperature occurs
Variation leads to 10% (30K) of heating of the gas temperature in cavity and gas-guide tube, according in its gas-guide tube of The Ideal-Gas Equation
Pressure will increase by 10%, leading to measure the worst resultant error is 10% × P0, and measurement result is about the water level error of 1m high,
Obvious gas-guide tube blocks this method and is difficult to receive, and water level is higher, variation is bigger, and measuring result error is also bigger.
Solenoid valve control gas-guide tube scheme: solenoid valve control cable gas-guide tube and atmosphere gas-guide tube and ambient atmos are used
On-off: solenoid valve belongs to open type, and cable gas-guide tube is communicated by atmosphere gas-guide tube with ambient atmos under normal circumstances, by liquid level
On atmospheric pressure P0 be connected with the negative pressure cavity of throw-in type pressure sensor, to offset the P0 at the throw-in type pressure sensor back side；
Once meeting water monitoring module detects water level rise information, RTU host, RTU host is notified to close electromagnetism using control line immediately
Valve is blocked between cable gas-guide tube and atmosphere gas-guide tube by solenoid valve, and cable gas-guide tube can not be communicated with ambient atmos；Until water
Position, which drops to, meets water monitoring module hereinafter, host just disconnects, and solenoid valve restores to the original state, and cable gas-guide tube saves phase with ambient atmos
Logical, the design has reached good water-proof function.
When in view of actual measurement, gas-guide tube is connection ambient atmosphere, the volume of ambient atmosphere can be thought infinite
Greatly, along with linear amendment and temperature-compensating, not considering that liquid temperature becomes substantially influences level gauging.Based on this thinking, benefit
With the on-off of solenoid valve control cable gas-guide tube and ambient atmos, it can meet measurement request, reach good when being submerged
Waterproofing grade.
Utility model content
Purpose of the utility model is to solve defects in the prior art, provide a kind of water proof type throw-in type pressure biography
Sensor, solves existing throw-in type pressure sensor and should meet the requirement of air guide when inspection shaft measures water level and meet flooded again
There is the technical issues of good waterproofing grade when not having.
To achieve the above object, the technical solution of the utility model is as follows:
A kind of water proof type throw-in type pressure sensor, including waterproof case, solenoid valve, atmosphere gas-guide tube, pressure sensor,
First connecting cable meets water monitoring module and the second connecting cable, and the first connecting cable includes the first connecting line and cable air guide
Pipe, first connecting cable include the first connecting line and cable gas-guide tube, and second connecting cable includes the second connecting line
And control line；
The solenoid valve is arranged in waterproof case, the both ends of the solenoid valve respectively with atmosphere gas-guide tube and cable air guide
Pipe connection, the other end of the atmosphere gas-guide tube are connected to ambient atmos, the other end and pressure sensing of the cable gas-guide tube
The negative pressure cavity of device is connected；
The both ends of first connecting line are connect with pressure sensor and the second connecting line respectively, and second connecting line is also
It is connect with water monitoring module is met, the control terminal of the control line and solenoid valve is electrically connected.
In order to further realize the utility model, epoxy resin is perfused in the waterproof case.
Beneficial effect
When the utility model is used, the external RTU host of the second connecting cable, solenoid valve belong to open type, under normal circumstances
Cable gas-guide tube is communicated by atmosphere gas-guide tube with ambient atmos, by the atmospheric pressure P0 and throw-in type pressure sensor on liquid level
Negative pressure cavity be connected, to offset the P0 at the throw-in type pressure sensor back side；Believe once meeting water monitoring module and detecting that water level goes up
Breath notifies RTU host immediately, and RTU host closes solenoid valve using control line, electric between cable gas-guide tube and atmosphere gas-guide tube
Magnet valve blocks, and cable gas-guide tube can not be communicated with ambient atmos；Until water level decreasing is to chance water monitoring module hereinafter, host just breaks
It opens, solenoid valve restores to the original state, and cable gas-guide tube is communicated with ambient atmos preservation, and the utility model is led using solenoid valve control cable
The on-off of tracheae and atmosphere gas-guide tube and ambient atmos should meet air guide requirement, and reach good water-proof function.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of the utility model water proof type throw-in type pressure sensor；
Description of symbols:
1, waterproof case；2, solenoid valve；3, atmosphere gas-guide tube；4, pressure sensor；5, the first connecting cable；6, water prison is met
Survey module；7, epoxy resin；8, the second connecting cable；9, cable gas-guide tube；10, the first connecting line；11, the second connecting line；12,
Control line.
Specific embodiment
The utility model is further described in detail with reference to the accompanying drawing, these attached drawings are simplified signal
Figure, only illustrates the basic structure of the utility model in a schematic way.
Embodiment one
As shown in Figure 1, the water proof type throw-in type pressure sensor of the utility model include waterproof case 1, it is solenoid valve 2, big
Conductance tracheae 3, the first connecting cable 5, meets water monitoring module 6 and the second connecting cable 8 at pressure sensor 4, in which:
First connecting cable 5 includes the first connecting line 10 and cable gas-guide tube 9；
Second connecting cable 8 includes the second connecting line 11 and control line 12；
Solenoid valve 2 be arranged in waterproof case 1, the both ends of solenoid valve 2 respectively with atmosphere gas-guide tube 3 and cable gas-guide tube 9
Connection, the other end of atmosphere gas-guide tube 3 are connected to ambient atmos, the other end of cable gas-guide tube 9 and the negative pressure of pressure sensor 4
Chamber is connected.
The both ends of first connecting line 10 are connect with pressure sensor 4 and the second connecting line 11 respectively, and the second connecting line 11 is also
It is connect with water monitoring module 6 is met, the control terminal of control line 12 and solenoid valve 2 is electrically connected.
It is perfused with epoxy resin 7 in waterproof case 1, internal component is wrapped up, good waterproof action is played,
Degree of protection can achieve IP68, can impregnate in the water of several meter Shen for a long time, substantially increase the reliability of product.
In use, the external RTU host of the second connecting cable, solenoid valve belong to open type, cable gas-guide tube under normal circumstances
It is communicated by atmosphere gas-guide tube with ambient atmos, by the negative pressure cavity phase of atmospheric pressure P0 and throw-in type pressure sensor on liquid level
Even, to offset the P0 at the throw-in type pressure sensor back side；Once meeting water monitoring module detects water level rise information, notify immediately
RTU host, RTU host are closed solenoid valve using control line, are blocked between cable gas-guide tube and atmosphere gas-guide tube by solenoid valve, electricity
Cable gas-guide tube can not be communicated with ambient atmos；Until water level decreasing is to water monitoring module is met hereinafter, host just disconnects, solenoid valve is extensive
Shape is restored, cable gas-guide tube is communicated with ambient atmos preservation, and the design uses solenoid valve control cable gas-guide tube and atmosphere air guide
The on-off of pipe and ambient atmos, should meet air guide requirement, reach good water-proof function.
The foregoing is merely the better embodiment of the utility model, the utility model is not limited to above-mentioned embodiment party
Formula, there may be the structural modifications that part is small in implementation process, if various changes or modifications to the utility model are not
The spirit and scope of the utility model are detached from, and are belonged within the scope of the claims and equivalents of the utility model, then originally
Utility model is also intended to encompass these modification and variations.
Claims (2)
1. a kind of water proof type throw-in type pressure sensor, including waterproof case, pressure sensor and chance water monitoring module, feature
It is, further includes solenoid valve, atmosphere gas-guide tube, the first connecting cable and the second connecting cable, first connecting cable includes
First connecting line and cable gas-guide tube, second connecting cable include the second connecting line and control line；
The solenoid valve is arranged in waterproof case, and the both ends of the solenoid valve connect with atmosphere gas-guide tube and cable gas-guide tube respectively
It connects, the other end of the atmosphere gas-guide tube is connected to ambient atmos, the other end of the cable gas-guide tube and pressure sensor
Negative pressure cavity is connected；
The both ends of first connecting line are connect with pressure sensor and the second connecting line respectively, second connecting line also with chance
The control terminal of the connection of water monitoring module, the control line and solenoid valve is electrically connected.
2. water proof type throw-in type pressure sensor according to claim 1, which is characterized in that perfusion in the waterproof case
There is epoxy resin.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920120942.1U CN209372179U (en) | 2019-01-23 | 2019-01-23 | A kind of water proof type throw-in type pressure sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920120942.1U CN209372179U (en) | 2019-01-23 | 2019-01-23 | A kind of water proof type throw-in type pressure sensor |
Publications (1)
| Publication Number | Publication Date |
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| CN209372179U true CN209372179U (en) | 2019-09-10 |
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| CN201920120942.1U Active CN209372179U (en) | 2019-01-23 | 2019-01-23 | A kind of water proof type throw-in type pressure sensor |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112345023A (en) * | 2020-09-17 | 2021-02-09 | 国网山东省电力公司昌邑市供电公司 | Cable trench ponding detection system |
| CN115507900A (en) * | 2022-11-11 | 2022-12-23 | 国网山东省电力公司荣成市供电公司 | Tunnel cable blind area detection system and detection method based on three-way lifting device |
-
2019
- 2019-01-23 CN CN201920120942.1U patent/CN209372179U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112345023A (en) * | 2020-09-17 | 2021-02-09 | 国网山东省电力公司昌邑市供电公司 | Cable trench ponding detection system |
| CN115507900A (en) * | 2022-11-11 | 2022-12-23 | 国网山东省电力公司荣成市供电公司 | Tunnel cable blind area detection system and detection method based on three-way lifting device |
| CN115507900B (en) * | 2022-11-11 | 2023-02-28 | 国网山东省电力公司荣成市供电公司 | Tunnel cable blind area detection system and detection method based on three-way lifting device |
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| GR01 | Patent grant | ||
| CP03 | Change of name, title or address |
Address after: 2 / F, no.1029 and 1031, Gaopu Road, Tianhe District, Guangzhou, Guangdong 510000 (office only) Patentee after: Ogilvy Technology Co.,Ltd. Address before: 510520 2nd floor, no.1029-1031, Gaopu Road, Tianhe Software Park, Tianhe District, Guangzhou City, Guangdong Province Patentee before: AUGUR INTELLIGENCE TECHNOLOGY (GUANGZHOU) Co.,Ltd. |
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