CN205049202U - Liquid level detector - Google Patents
Liquid level detector Download PDFInfo
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- CN205049202U CN205049202U CN201520802437.7U CN201520802437U CN205049202U CN 205049202 U CN205049202 U CN 205049202U CN 201520802437 U CN201520802437 U CN 201520802437U CN 205049202 U CN205049202 U CN 205049202U
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Abstract
The utility model relates to a need not be to the liquid level detector who introduces outside atmospheric pressure in the pressure detection portion in the liquid that puts into, it includes: the fluid pressure test section, the fluid pressure test section is used for measuring the pressure of liquid, with the atmospheric pressure test section, the atmospheric pressure test section is used for measuring atmospheric pressure and be connected through cable and fluid pressure test section electricity, wherein, the fluid pressure test section includes the fluid pressure sensor, back in putting into liquid, the fluid pressure sensor produces the pressure signal who corresponds with fluid pressure according to the fluid pressure who receives, the atmospheric pressure test section produces the pressure signal who corresponds with atmospheric pressure at fluid pressure test section during operation according to the atmospheric pressure who receives, and the at least party in fluid pressure test section and the atmospheric pressure test section can transmit the pressure signal that this party detected to the another party through the cable.
Description
Technical field
The utility model relates to a kind of liquid level detector, particularly relates to a kind of liquid level detector not needing to introduce outside atmospheric pressure in the pressure detecting portion put in liquid.
Background technology
In the level switch measuring water level, more commonly throw-in type level switch.The pressure transducer for measuring water level is provided with in this throw-in type level switch.Throw-in type level switch is based on the proportional principle of the height of surveyed fluid pressure and this liquid, adopts pressure transducer that static pressure is converted to electric signal, then processes the electric signal coming from pressure transducer, finally obtain required waterlevel data.Above-mentioned principle can be expressed as following expression formula (1):
Ρ=ρ gH+Po expression formula (1)
In formula: P meets the pressure suffered by liquid level for throw-in type level switch; ρ is the density of fluid to be measured; G is local gravitational acceleration; Po is the atmospheric pressure on liquid level; H is the degree of depth that throw-in type level switch drops in liquid.
In the operation of reality, the pressure of liquid can be incorporated into the malleation chamber of sensor, then by special air guide cable, the atmospheric pressure Po on liquid level be connected with the negative pressure cavity of sensor, so that the Po at the offset sensor back side.At this moment, the pressure P recorded by sensor just equals ρ gH.Obviously, by measuring pressure P, liquid level can be obtained.
Due to need outside atmosphere to be incorporated into level switch negative pressure cab in so that the atmospheric pressure of compensation water bit detector, so inevitably cause the steam in air to be also introduced in the negative pressure cab of level switch.Under the condition of Long-Time Service, easily there is the situation that steam condenses in wireway.The aqueous water that condensation vapor is formed can block wireway, even causes sensor to damage.
Utility model content
The utility model is a kind of liquid level detector of throw-in type, it does not need to introduce outside atmospheric pressure in the pressure detecting portion put in liquid just can Measurement accuracy liquid level (water level), therefore can avoid the situation occurring condensation vapor during Long-Time Service in the sensor, increase substantially the serviceable life of liquid level detector.
Liquid level detector of the present utility model comprises: fluid pressure test section, and described fluid pressure test section is for measuring the pressure of liquid, with atmospheric pressure detection portion, described atmospheric pressure detection portion is for measuring atmospheric pressure and being electrically connected with fluid pressure test section by cable, in a state of use, described fluid pressure test section drops in liquid, described atmospheric pressure detection portion not to drop in liquid but exposes in an atmosphere, wherein, described fluid pressure test section comprises liquid-pressure pick-up, putting into after in liquid, described liquid-pressure pick-up produces the pressure signal corresponding with fluid pressure according to the fluid pressure be subject to, described atmospheric pressure detection portion produces the pressure signal corresponding with atmospheric pressure when described fluid pressure test section work according to the atmospheric pressure be subject to, and at least one party in described fluid pressure test section and described atmospheric pressure detection portion can by described cable by the pressure signal transmission detected by this side to the opposing party.
Preferably, described liquid level detector also comprises control circuit, described control circuit receives and comes from the pressure signal of described fluid pressure test section and come from the pressure signal in atmospheric pressure detection portion, and calculate the degree of depth in described fluid pressure test section input liquid according to following expression: H=(P-Po)/(ρ g), wherein, H is the degree of depth that described fluid pressure test section drops in liquid, P is the fluid pressure that described fluid pressure test section detects, Po is the atmospheric pressure that described atmospheric pressure detection portion detects, ρ is the density of fluid to be measured, g is local gravitational acceleration.
Preferably, described control circuit is arranged in described fluid pressure test section, and detected pressure signal is passed to described control circuit by described cable by described atmospheric pressure detection portion.
Preferably, described control circuit is arranged in described atmospheric pressure detection portion, and detected pressure signal is passed to described control circuit by described cable by described fluid pressure test section.
Preferably, described liquid level detector also comprises temperature sensor, and described temperature sensor is arranged at least one party in described fluid pressure test section and described atmospheric pressure detection portion.
Preferably, described atmospheric pressure detection portion also comprises humidity sensor.
Preferably, described cable is installed on described fluid pressure test section and described atmospheric pressure detection portion removably.
Accompanying drawing explanation
Fig. 1 is the skeleton diagram of the liquid level detector of the first embodiment of the present utility model.
Fig. 2 is the schematic diagram of liquid level detector when sensed water level of the first embodiment.
Fig. 3 is the skeleton diagram of the liquid level detector of the second embodiment of the present utility model.
Description of reference numerals:
100. level switch; 1. atmospheric pressure detection portion; 2. water pressure test section; 3. cable; 21. control circuits; 22. water pressure sensors; 200. level switch; 201. barometric pressure sensor; 221. control circuit.
Embodiment
Illustrative embodiments of the present utility model is described in detail hereinafter with reference to accompanying drawing.In the following embodiments, in order to the convenience illustrated, using water as the example of liquid, using the level switch 100 of throw-in type as the example of liquid level detector of the present utility model, but the utility model is not limited thereto.
First embodiment
Fig. 1 is the skeleton diagram of the liquid level detector of the first embodiment of the present utility model.Level switch 100 for detecting the depth of water has been shown in Fig. 1.Level switch 100 comprises atmospheric pressure detection portion 1 for measuring atmospheric pressure, for measuring water pressure test section 2 and the cable 3 of the pressure of water, atmospheric pressure detection portion 1 is electrically connected with water pressure test section 2 by cable 3.
Control circuit 21 and water pressure sensor 22 is provided with in water pressure test section 2.Two-way blank arrowhead in Fig. 1 represents between control circuit 21 with water pressure sensor 22 for two-way signaling is connected, but this is also nonrestrictive, only water pressure sensor 22 also can be adopted produced electric pressure signal to be passed to the one way signal connected mode of control circuit 21.By cable 3, the electric pressure signal of the representative atmospheric pressure produced by atmospheric pressure detection portion 1 can be sent to control circuit 21.
Level switch 100 under duty has been shown in Fig. 2.In working order, water pressure test section 2 is put in water, and water pressure sensor 22 produces the electric pressure signal corresponding with hydraulic pressure according to the hydraulic pressure be subject to.Now, atmospheric pressure detection portion 1 stays on the bank and exposes in an atmosphere, to produce the electric pressure signal corresponding with atmospheric pressure according to the atmospheric pressure be subject to.
The electric pressure signal that control circuit 21 can produce separately according to water pressure sensor 22 and atmospheric pressure detection portion 1 calculates current waterlevel data.The principle of this calculating is aforementioned expression (1).If by the left side needing the water level detected to be placed on expression formula, then expression formula (1) can be transformed to expression formula (2): H=(P-Po)/(ρ g), wherein, H is the degree of depth (namely, needing the water level detected) that water pressure test section 2 drops in water, P is the hydraulic pressure that water pressure test section 2 detects, Po is the atmospheric pressure that atmospheric pressure detection portion 1 detects, ρ is the density of water, and g is local gravitational acceleration.
Present embodiment difference with the prior art is that the mode of the Po obtained in expression formula (1) or (2) is different.In the present embodiment, atmospheric pressure detection portion 1 does not drop in water, but sends by cable 3 atmosphere pressure signal detected to control circuit 21.So no longer need outside atmosphere to be incorporated into so that the atmospheric pressure of compensation water bit detector in the negative pressure cab of level switch, thus no longer need special air guide cable.Therefore, in present embodiment, cable 3 adopts can the ordinary city sale of electricity cable of waterproof.Cable 3 is installed on water pressure test section 2 and atmospheric pressure detection portion 1 removably, so that operator changes the cable of different length according to the degree of the depth of water.Such one side reduces cost, also facilitates the operation in remote districts on the other hand, adaptability of the present utility model is greatly strengthened.
In addition, in present embodiment, owing to not needing to introduce air in water pressure test section 2, thus avoid steam and condense in water pressure test section 2.Like this, even if when level switch 100 Long-Time Service, do not worry causing sensor fault because of condensation vapor yet, thus significantly extend serviceable life.
Adopt the level switch 100 of present embodiment can reach following technical indicator.Temperature measurement range is subzero 40 DEG C to+85 DEG C, and level measuring scope is 0 to 250m water pressure, water level measurement accuracy be 0.1%FS(namely, the gap of measured value and actual value).
Second embodiment
Fig. 3 is the skeleton diagram of the level switch 200 of the second embodiment of the present utility model.
The difference of the level switch 200 of the second embodiment and the level switch 100 of the first embodiment is, atmospheric pressure detection portion 1 comprises barometric pressure sensor 201 and control circuit 221, do not arrange control circuit in water pressure test section 2, the operationally detected water pressure signal of water pressure test section 2 sends control circuit 221 to by cable 3.
Two-way blank arrowhead in Fig. 3 represents between control circuit 221 with barometric pressure sensor 201 for two-way signaling is connected, but this is also nonrestrictive, only barometric pressure sensor 201 also can be adopted produced electric pressure signal to be passed to the one way signal connected mode of control circuit 221.By cable 3, the electric pressure signal of the representative water pressure produced by water pressure test section 2 can be sent to control circuit 221.
The effect of the control circuit 21 in the effect of control circuit 221 and the first embodiment is similar.That is, the electric pressure signal that control circuit 221 can produce separately according to water pressure test section 2 and atmospheric pressure detection portion 1 calculates current waterlevel data.
The level switch 200 of the second embodiment has the performance same with the level switch 100 of the first embodiment and advantage.In addition, owing to not arranging control circuit in water pressure test section 2, so the structure of water pressure test section 2 can simplify, size also can be less.
3rd embodiment (not shown)
Present embodiment is on the basis of foregoing first embodiment and the second embodiment, adds cooling-water temperature sensor for detecting water temperature and for the temperature of the temperature and/or humidity that detect air and/or humidity sensor.By the sensor that these increase, operator can recognize more information, thus strengthens function of the present utility model further.
4th embodiment (not shown)
Present embodiment on any one basis, adds the data outputting unit outwards exporting data in atmospheric pressure detection portion 1 in foregoing first embodiment to the 3rd embodiment.By data outputting unit, the information such as the water level recorded in liquid level detector of the present utility model, temperature can output in the equipment of such as computer, display screen etc. by operator.
At above-mentioned first embodiment in the 4th embodiment, mainly describe feature technology of the present utility model.One of ordinary skill in the art will readily recognize that unexplained reference in the above-described embodiment or the technology omitted the description can find suitable scheme in the prior art.Such as, need the water pressure test section 2 be put in water to need to be provided with the shell of waterproof, infiltrate its internal circuit to prevent water and cause fault.Again such as, the signal demand of each pressure transducer (22,201) just can be given control circuit (21,221) and processes after amplifying circuit strengthens.These technology are not due to directly related with object to be solved in the utility model, and those skilled in the art easily expect suitable solution, thus do not elaborate.Therefore, above-mentioned first embodiment is exemplary to the 4th embodiment, and is not intended to carry out any restriction to the utility model.
Although describe the utility model with reference to illustrative embodiments, should be appreciated that the utility model is not limited to disclosed illustrative embodiments.One of ordinary skill in the art will readily recognize that on the basis of claims, when not deviating from purport of the present utility model and spirit, various modification and equivalent replacement can be carried out.Therefore, the scope of claims should meet the most wide in range explanation, to comprise all modification, equivalent structure and function.
Claims (7)
1. a liquid level detector, is characterized in that comprising:
Fluid pressure test section, described fluid pressure test section is for measuring the pressure of liquid; With
Atmospheric pressure detection portion, described atmospheric pressure detection portion is for measuring atmospheric pressure and being electrically connected with fluid pressure test section by cable;
Described fluid pressure test section drops in liquid in use, and described atmospheric pressure detection portion not to drop in liquid but exposes in an atmosphere, wherein,
Described fluid pressure test section comprises liquid-pressure pick-up, is putting into after in liquid, and described liquid-pressure pick-up produces the pressure signal corresponding with fluid pressure according to the fluid pressure be subject to,
Described atmospheric pressure detection portion produces the pressure signal corresponding with atmospheric pressure when described fluid pressure test section work according to the atmospheric pressure be subject to, and
At least one party in described fluid pressure test section and described atmospheric pressure detection portion can by described cable by the pressure signal transmission detected by this side to the opposing party.
2. liquid level detector according to claim 1, is characterized in that,
Described liquid level detector also comprises control circuit, and described control circuit receives and comes from the pressure signal of described fluid pressure test section and come from the pressure signal in atmospheric pressure detection portion, and calculates the degree of depth in described fluid pressure test section input liquid.
3. liquid level detector according to claim 2, is characterized in that,
Described control circuit is arranged in described fluid pressure test section, and detected pressure signal is passed to described control circuit by described cable by described atmospheric pressure detection portion.
4. liquid level detector according to claim 2, is characterized in that,
Described control circuit is arranged in described atmospheric pressure detection portion, and detected pressure signal is passed to described control circuit by described cable by described fluid pressure test section.
5. liquid level detector according to claim 1 and 2, is characterized in that,
Described liquid level detector also comprises temperature sensor, and described temperature sensor is arranged at least one party in described fluid pressure test section and described atmospheric pressure detection portion.
6. liquid level detector according to claim 1 and 2, is characterized in that,
Described atmospheric pressure detection portion also comprises humidity sensor.
7. liquid level detector according to claim 1, is characterized in that,
Described cable is installed on described fluid pressure test section and described atmospheric pressure detection portion removably.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520802437.7U CN205049202U (en) | 2015-10-13 | 2015-10-13 | Liquid level detector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520802437.7U CN205049202U (en) | 2015-10-13 | 2015-10-13 | Liquid level detector |
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| Publication Number | Publication Date |
|---|---|
| CN205049202U true CN205049202U (en) | 2016-02-24 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201520802437.7U Expired - Fee Related CN205049202U (en) | 2015-10-13 | 2015-10-13 | Liquid level detector |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106092255A (en) * | 2016-08-29 | 2016-11-09 | 成都汉康信息产业有限公司 | A kind of river level detection alarm device |
| CN107421601A (en) * | 2017-05-26 | 2017-12-01 | 国家海洋局第二海洋研究所 | Intelligent remote real-time monitoring system and its monitoring method to ocean tidal level |
| CN107576314A (en) * | 2017-09-27 | 2018-01-12 | 长江水利委员会长江科学院 | Float type depopulated zone rivers and lakes automatic monitoring system |
| CN108814502A (en) * | 2018-06-29 | 2018-11-16 | 歌尔股份有限公司 | A kind of dish-washing machine level measuring control method and system |
-
2015
- 2015-10-13 CN CN201520802437.7U patent/CN205049202U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106092255A (en) * | 2016-08-29 | 2016-11-09 | 成都汉康信息产业有限公司 | A kind of river level detection alarm device |
| CN107421601A (en) * | 2017-05-26 | 2017-12-01 | 国家海洋局第二海洋研究所 | Intelligent remote real-time monitoring system and its monitoring method to ocean tidal level |
| CN107421601B (en) * | 2017-05-26 | 2019-06-28 | 自然资源部第二海洋研究所 | Intelligent remote real-time monitoring system and its monitoring method to ocean tidal level |
| CN107576314A (en) * | 2017-09-27 | 2018-01-12 | 长江水利委员会长江科学院 | Float type depopulated zone rivers and lakes automatic monitoring system |
| CN108814502A (en) * | 2018-06-29 | 2018-11-16 | 歌尔股份有限公司 | A kind of dish-washing machine level measuring control method and system |
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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 | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20160224 Termination date: 20161013 |