CN201145586Y - Novel capacitance type sensor - Google Patents
Novel capacitance type sensor Download PDFInfo
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- CN201145586Y CN201145586Y CNU2007201933406U CN200720193340U CN201145586Y CN 201145586 Y CN201145586 Y CN 201145586Y CN U2007201933406 U CNU2007201933406 U CN U2007201933406U CN 200720193340 U CN200720193340 U CN 200720193340U CN 201145586 Y CN201145586 Y CN 201145586Y
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Abstract
The utility model relates to a novel capacitive transducer, wherein, a power line end and a signal line end are arranged on the transducer; an electric element integrated body is arranged inside a transducer shell; a capacitor plate is also arranged on the transducer shell; and the transducer shell, the capacitor plate and the electric element integrated body are made into an undetachable whole. The novel capacitive transducer is mainly applied to a wading device to detect the water level or to judge whether water exists, and also can be applied in other situations where the dielectric constant of materials is time-varied to detect other parameters of the materials which are changed along with the dielectric constant. The novel capacitive transducer is characterized by stable operation of the transducer and reliable signal detection.
Description
Affiliated technical field
The utility model relates to sensor technical field, relate in particular to a kind of novel capacitance-type sensor, be mainly used in and carry out level sensing on the equipment of paddling or judged whether water, time dependent other occasion of specific inductive capacity that also can be applied in material detects the parameter of material with change in dielectric constant.
Background technology
Often need use the sensor of sensed water level (or water is not arranged) in the control system of equipment of paddling, technique known has at present:
First kind of technology: the liquid level sensor of forming by magnetic float and tongue tube.A kind of structure is that magnetic float is set in water, at external container tongue tube is set; Another kind of structure is that tongue tube is arranged on (anhydrous in the structural pipe, as to keep dry) in the structural pipe, and the magnetic concentric float is enclosed within outside the pipe.Utilize magnetic float near or make tongue tube occur closed or disconnect away from tongue tube, carry out level sensing, and then control the paddle action of equipment, for example break-make of the start-stop of the keying of solenoid valve, water pump or electric heater power supply or the like.This technology is used more general, and its shortcoming is: structure is complicated, mechanical action is arranged, poor reliability.
Second kind of technology: conductivity sensor.Two or more electrodes are set in water, utilize electrode conduction whether to carry out level sensor.This technology is used more general, but have unsurmountable shortcoming: the electric conductivity of water is subjected to the influence of conducting particles content in the water, electric conductivity as pure water and light water has very big difference, pure water conducts electricity hardly, and ordinary tap water has electric conductivity preferably, so the difference of water quality will have a strong impact on the reliability of this method.
The third technology: infrared light---float sensor.Side at the printing opacity wall is provided with the infraluminescence pipe, at the opposite side of printing opacity wall infrared receiving tube is set, and utilizes float whether to block infrared light and carries out level sensing.This The Application of Technology is also more general, and its shortcoming is: the necessary printing opacity of wall material, and structure is complicated, and cost is higher, and mechanical action is arranged, poor reliability, range of application is subjected to certain limitation.
The 4th kind of technology: capacitance type sensor.In needs sensed water level part one capacitor plate (being capacitive transducer) is set, draws lead to the electric control circuit plate of equipment from two pole plates of this electric capacity respectively, utilize the change in dielectric constant in the capacitor plate to carry out level sensor.Because the specific inductive capacity of water is very big, the specific inductive capacity of air is very little, and the size of sensor capacitance is proportional to the specific inductive capacity between pole plate, so in theory fully can be according to the variation of the specific inductive capacity state of judging that whether there is water or not.But the electric capacity of sensor capacitance is very little, just signal very a little less than, be very easy to be subjected to Effect of Environmental, especially the lead of drawing from capacitor plate is very big to the influence of electric capacity.So this capacitance type sensor anti-interference is very poor, just reliability is very poor.
In sum, all there is the problem of poor reliability in the liquid level sensor of known technology, make the liquid level sensor good reliability, and cost is low, can adapt to the also technical breakthrough of needs of various water quality.
Summary of the invention
Technical problem to be solved in the utility model is to provide a kind of novel capacitance-type sensor at the deficiency of above-mentioned prior art present situation, be mainly used on the equipment of paddling sensed water level or judged whether water, time dependent other occasion of specific inductive capacity that also can be applied in material detects material other parameter with change in dielectric constant, be characterized in that working sensor is stable, input is reliable.
The utility model solves the problems of the technologies described above the technical scheme that is adopted: sensor is provided with mains terminals and signal line end, the electrical equipment conglomerate is set in sensor housing, also be provided with capacitor plate on the sensor housing, sensor housing, capacitor plate and electrical equipment conglomerate are made an integral body.
Described mains terminals requires to connect AC power, and its voltage can be 220V, can be 110V, can be 24V, also can be other voltage; Its frequency can be 50Hz, also can be higher than 50Hz.In order to make signal intensity enough, guarantee electrical safety simultaneously, preferred voltage is 24V, frequency is not less than the AC power of 50Hz.
Described signal line end can output switching signal, also can output voltage signal.
1. for the situation of output switching signal:
Comprise signal processing circuit and relay in the described electrical equipment conglomerate, whether signal processing circuit is handled back pilot relay line bag to capacitance signal and is switched on, and then the break-make of pilot relay contact.For example, when anhydrous between the pole plate (promptly being full of air), the outage of relay line bag, its normally opened contact is an off-state, normally closed contact is a closure state; When being full of water between the pole plate, the energising of relay line bag, its normally opened contact closure, normally closed contact disconnects.
2. for the situation of output voltage signal:
Comprise signal processing circuit and voltage follower circuit in the described electrical equipment conglomerate, after signal processing circuit was handled capacitance signal, the voltage signal that can make output was the series voltage signal; The voltage signal that also can make output is high level and low level two states, is called digital signal (0 and 1 two states) in this manual.
A. for the situation of exporting the series voltage signal:
The specific inductive capacity of some materials is relevant with temperature.Now for an embodiment: temperature is the DIELECTRIC CONSTANT of 100 ℃ water
rBe 55.3, temperature is the DIELECTRIC CONSTANT of 20 ℃ water
rBe 80.4, when being full of water in the sensor capacitance pole plate, the variation of water temperature will cause change in dielectric constant, and the variation of specific inductive capacity causes the variation of sensor capacitance, and at this moment, the series voltage signal of sensor output just can reflect the serial temperature value of water.
The degree of the material filling capacitor plate that specific inductive capacity is bigger is relevant with the instantaneous electric capacity of sensor capacitance.Now for an embodiment: make the pole plate of sensor capacitance longer, and make it vertically be installed in the top of water container, if water temperature is constant substantially in whole testing process, then when water level rises gradually, the space in the capacitor plate is water-filling gradually from bottom to top in the longitudinal direction.Because the specific inductive capacity and the air of water have the bigger difference (DIELECTRIC CONSTANT of 20 ℃ air
rIt is the DIELECTRIC CONSTANT of 1.000585,20 ℃ water
rBe 80.4), so in the uphill process of water level, the instantaneous electric capacity of sensor is increasing gradually, at this moment, the series voltage signal of sensor output just can reflect the serial water level value in the water container.
B. for the situation of exporting digital signal:
Sometimes only need the judgment device somewhere whether to have certain material.Now for an embodiment: sensor is used for judging whether hot bottle in drinking machine has water, at this moment, can makes the pole plate of sensor capacitance shorter, also can make capacitor plate longer.Though the rising of water level is a process, the increase of sensor capacitance also is a process,, as long as the instantaneous electric capacity that sensor detects is not less than setting value, then export high level, representing in the heat jar has water; Otherwise the instantaneous electric capacity that detects when sensor is during less than setting value, and output low level is then represented in the heat jar anhydrous.
Further technical measures of the present utility model are: the surface of capacitor plate is provided with insulation course, to guarantee being in state of insulation between the pole plate.
Because the electrical equipment of the instantaneous electric capacity of processes sensor (capacitance signal) is integrated in the sensor housing, feasible almost nil to the length of the connection lead the electrical equipment conglomerate from sensor plate, this has just eliminated the influence of this lead to sensor capacitance effectively; In addition, the signal from the output of signal line end is that it has very strong anti-interference through processing and amplifying signal.So the utility model novel capacitance-type sensor has very high reliability.
The utility model novel capacitance-type sensor has kept the advantage of common electrical capacity sensor, the time does not have mechanical action in operation that is:, can there was a mechanical failure, and long service life; Dynamic response is good, as is used to detect water temperature, and it does not have the temperature inertia of traditional temperature controller.
The beneficial effect of the utility model novel capacitance-type sensor is: working sensor is stable, input is reliable, can be used for sensed water level, can be used to detect water temperature, time dependent other occasion of specific inductive capacity that also can be used for material detects material other parameter with change in dielectric constant.
Description of drawings
Fig. 1 is the utility model embodiment one structural representation.
Fig. 2 is that embodiment one is applied in the structural representation on the pipeline.
Fig. 3 is the A of Fig. 2---the A cut-open view.
Fig. 4 is the stereographic map of short tube among Fig. 2 (9).
Fig. 5 all is equipped with the structural representation of embodiment one for the upper base of water container with going to the bottom.
Fig. 6 is the electrical schematic diagram of embodiment one.
Fig. 7 is the utility model embodiment two structural representations.
Fig. 8 is the electrical schematic diagram of embodiment two.
Fig. 9 is equipped with the structural representation of embodiment two for the upper base of water container.
Embodiment
Below in conjunction with concrete accompanying drawing the utility model is described in detail, but is to be understood that the detailed description does not here constitute the restriction to the utility model protection domain.
Embodiment one: in conjunction with shown in Figure 1, sensor is provided with two mains terminals (1) and three signal line ends (2), electrical equipment conglomerate (3) is set in sensor housing (6), also be provided with capacitor plate (7) on the sensor housing (6), the surface of capacitor plate (7) is provided with insulation course (8), sensor housing (6) is provided with external thread, and sensor housing (6), capacitor plate (7) and electrical equipment conglomerate (3) are made non-removable integral body, i.e. novel capacitance-type sensor.O-ring seal (5) and nut (4) are used for the equipment of sensor mount at the place.
Fig. 2 is whether embodiment one is applied in water in the detection pipeline on the pipeline a structural representation, and Fig. 3 is the A of Fig. 2---A cut-open view, Fig. 4 are the stereographic map of short tube among Fig. 2 (9).In conjunction with Fig. 2, Fig. 3, Fig. 4 and shown in Figure 1, on seat board (11), seat board (11) passes through screw (13), packing ring (14), O-ring seal (10) sealing and fixing on short tube (9) to novel capacitance-type sensor by O-ring seal (5) and nut (4) sealing and fixing.
Fig. 5 is that the upper base of water container (12) all is equipped with the structural representation of embodiment one with going to the bottom, and whether can be respectively applied for top and the bottom of surveying water container (12) has water.
Fig. 6 is the electrical schematic diagram of embodiment one, i.e. the electrical schematic diagram of electrical equipment conglomerate (3), and in conjunction with Fig. 6 and shown in Figure 1, power supply adopts the 24V alternating current, and mains terminals (1) is I and II; Signal line end (2) is III, IV, V, and wherein V is the common port of relay J, and III and V are a pair of normally closed contacts of relay J, and IV and V are a pair of normally opened contacts of relay J, output switching signal; C
jBe the formed electric capacity of sensor capacitance pole plate (7).Specific inductive capacity when between capacitor plate (7) is bigger, when for example being full of water between pole plate (7), and C then
jBigger, at C
jThe pressure drop at two ends is less, and is bigger in the pressure drop of A, B point-to-point transmission, and this signal makes the line bag energising of relay J after treatment, so the normally closed contact of relay J disconnects the normally opened contact closure; Specific inductive capacity when between capacitor plate (7) is less, for example between pole plate (7) when anhydrous, and C then
jLess, at C
jThe pressure drop at two ends is bigger, and is less in the pressure drop of A, B point-to-point transmission, and this signal makes the line bag outage of relay J after treatment, so the normally closed contact closure of relay J, normally opened contact disconnects.
Embodiment two: in conjunction with shown in Figure 7, sensor is provided with two mains terminals (18) and two signal line ends (19), electrical equipment conglomerate (17) is set in sensor housing (20), also be provided with capacitor plate (15) on the sensor housing (20), the surface of capacitor plate (15) is provided with insulation course (16), and sensor housing (20) is provided with external thread; Sensor housing (20), capacitor plate (15) and electrical equipment conglomerate (17) are made non-removable integral body, i.e. novel capacitance-type sensor.O-ring seal (22) and nut (21) are used for the equipment of sensor mount at the place.
Fig. 8 is the electrical schematic diagram of embodiment two, i.e. the electrical schematic diagram of electrical equipment conglomerate (17), and in conjunction with Fig. 8 and shown in Figure 7, power supply adopts the 24V alternating current, and mains terminals (18) is I and II; Signal line end (19) is III, IV, output voltage signal; C
jElectric capacity for sensor capacitance pole plate (15) formation.Specific inductive capacity when between capacitor plate (15) is certain value, when for example the water level between pole plate (15) reaches certain position from bottom to top, and C then
jCorresponding certain capacitance is at C
jCorresponding certain magnitude of voltage of the voltage at two ends, at also corresponding magnitude of voltage of voltage of A, B point-to-point transmission, this signal is after treatment in III and corresponding voltage value of IV signal line end (19) output; Specific inductive capacity when between capacitor plate (15) is another value, when for example the water level between pole plate (15) reaches another position from bottom to top, and C then
jCorresponding another capacitance is at C
jCorresponding another magnitude of voltage of the voltage at two ends, at also corresponding magnitude of voltage of voltage of A, B point-to-point transmission, this signal is exported another corresponding voltage value at III and IV signal line end (19) after treatment.
Fig. 9 is the structural representation that the upper base of water container (23) is equipped with embodiment two, can be used for surveying the water level in the water container (23).
Claims (10)
1. novel capacitance-type sensor, it is characterized in that: sensor is provided with mains terminals and signal line end, and the electrical equipment conglomerate is arranged on the sensor.
2. novel capacitance-type sensor according to claim 1, it is characterized in that: sensor housing is provided with capacitor plate, and sensor housing, capacitor plate and electrical equipment conglomerate are made an integral body.
3. novel capacitance-type sensor according to claim 1 is characterized in that: the housing of described sensor is provided with screw thread.
4. novel capacitance-type sensor according to claim 2 is characterized in that: described capacitor plate is provided with insulation course.
5. novel capacitance-type sensor according to claim 1 is characterized in that: described mains terminals requires to connect AC power.
6. novel capacitance-type sensor according to claim 1 is characterized in that: described electrical equipment conglomerate comprises relay.
7. novel capacitance-type sensor according to claim 1 is characterized in that: described signal line end output switching signal.
8. novel capacitance-type sensor according to claim 1 is characterized in that: described signal line end output voltage signal.
9. novel capacitance-type sensor according to claim 8 is characterized in that: described voltage signal is a digital signal.
10. novel capacitance-type sensor according to claim 8 is characterized in that: described voltage signal is the series voltage signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007201933406U CN201145586Y (en) | 2007-11-21 | 2007-11-21 | Novel capacitance type sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007201933406U CN201145586Y (en) | 2007-11-21 | 2007-11-21 | Novel capacitance type sensor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201145586Y true CN201145586Y (en) | 2008-11-05 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2007201933406U Expired - Fee Related CN201145586Y (en) | 2007-11-21 | 2007-11-21 | Novel capacitance type sensor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201145586Y (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103175187A (en) * | 2013-03-19 | 2013-06-26 | 江苏白雪电器股份有限公司 | Steam boiler |
| CN107091697A (en) * | 2016-02-18 | 2017-08-25 | 中芯国际集成电路制造(上海)有限公司 | Temperature sensor and thermometry, electronic installation based on silicon hole |
-
2007
- 2007-11-21 CN CNU2007201933406U patent/CN201145586Y/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103175187A (en) * | 2013-03-19 | 2013-06-26 | 江苏白雪电器股份有限公司 | Steam boiler |
| CN107091697A (en) * | 2016-02-18 | 2017-08-25 | 中芯国际集成电路制造(上海)有限公司 | Temperature sensor and thermometry, electronic installation based on silicon hole |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20081105 Termination date: 20091221 |