CN202869597U - Water level and water temperature detecting device for solar water heater - Google Patents

Water level and water temperature detecting device for solar water heater Download PDF

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Publication number
CN202869597U
CN202869597U CN 201220318702 CN201220318702U CN202869597U CN 202869597 U CN202869597 U CN 202869597U CN 201220318702 CN201220318702 CN 201220318702 CN 201220318702 U CN201220318702 U CN 201220318702U CN 202869597 U CN202869597 U CN 202869597U
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China
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water
measuring probe
water level
probe
reference electrode
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Expired - Fee Related
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CN 201220318702
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Chinese (zh)
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邹亮平
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Individual
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Individual
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Abstract

The utility model relates to a water level and water temperature detecting device for a water tank of a solar water heater. The detecting device comprises a measuring probe (equipped with a thermistor inside), a reference electrode and a capacitance measuring circuit, wherein continuous conductors are arranged on the surface of the measuring probe, and the surfaces of the conductors are coated by an insulation material; the reference electrode is a conductor contacted with water, and the water tank can be directly used as the reference electrode when the inner wall of the water tank is metal; when the water level changes, the length of the measuring probe immersed into the water changes as well; the larger the length of the measuring probe immersed into the water is, the larger the capacitance between the measuring probe conductors and the water is; the capacitance measuring circuit converts the capacitance value between the measuring probe and the reference electrode into an electrical parameter. Therefore, the frequency value of square waves output by the measuring circuit reflects the length of the measuring probe immersed into the water, and the frequency of the output square waves can be converted into the water level after the measuring probe is fixedly installed; and the thermistor arranged in the probe is located near the lowest water level point and can detect the water temperature.

Description

A kind of water level and temperature detector for solar water heater
Technical field
The utility model relates to a kind of condensate tank of dehumidifier, specifically a kind of water level and temperature detector for solar water heater.
Background technology
The at present general condensate tank of dehumidifier cardinal principle of solar water heater has the ball float position probing or utilizes the probe in detecting of water electric conductivity.Whether these devices can only sensed water level reach ball float or probe location, detect a plurality of water levels such as need, a plurality of ball floats then need be installed or adopt many probes.Because the convenience of cost and installation, present multistage water level detecting adopts root probe in detecting principle more.And many with the corrosion of electric probe in water, fouling, and the sealing surface problem such as leak causes failure of apparatus easily on the structure.
The utility model content
The utility model provides a kind of water level for solar water heater and temperature detector, has overcome the shortcoming of said apparatus, and apparatus structure is simple, and long service life is in stable condition.
The technical scheme that the utility model solves above technical matters is:
A kind of water level and temperature detector for solar water heater comprise the capacitance measurement circuit of measuring probe, reference electrode and connection amount probe and reference electrode; Reference electrode is the conductor that contacts with water that is arranged in the water tank, and perhaps when tank inner wall was metal, reference electrode was tank inner wall; Measuring probe is arranged in the water tank along the setting of height of water level direction, its length is more than or equal to peak level in the water tank, be provided with continuous electric conductor in the measuring probe, electric conductor forms certain girth in probe cross section, the surface area of electric conductor increases with effective detection length of measuring probe, the electric conductor surface coverage of measuring probe or be wrapped in insulation course makes electric conductor and water isolation and the insulation of measuring probe.
Principle of the present utility model is: the water of parcel probe is conductor, and the electric capacity between probe and the water and the thickness of insulation course are inversely proportional to, and the external surface area that is immersed in the water part with specific inductive capacity and probe is directly proportional.When the material of insulation course, thickness one regularly, probe is immersed in the water external surface area partly with electric capacity between the water with probe and is directly proportional.For the probe of uniform cross-section, its external surface area that is immersed in the water part is directly proportional with its water-immersed length again.Therefore, the electric capacity between probe and the water is directly proportional with its water-immersed length.Like this, come the water-immersed length of perception probe by the capacitance between measuring probe and the water, thus the perception water level.Based on above-mentioned principle, the utility model device comes the water-immersed length of perception probe by the capacitance between measuring probe and the water, thus the perception water level, and thermistor of installation of installing at probe simultaneously is used for measuring the water temperature in the water tank.
The technical scheme that the utility model further limits is:
Aforesaid water level and temperature detector for solar water heater, the multivibrator circuit that capacitance measurement circuit consists of for the time base chip by CMOS type 555, the amount of connecing probe and reference electrode are equivalent to variable capacitor C x, connect between the TR/TH end and ground of 555 chips, power supply VCC charges to capacitor C x by resistance R 1 and R2, after capacitor C x voltage rose to reversal voltage, capacitor C x formed multi-harmonic-oscillations by the DC end discharge of resistance R 2 to 555 chips.After the circuitous resistance parameter was fixing, oscillation frequency was decided by electric capacity, and the frequency of measuring this circuit output can obtain the size of capacitor C x, thereby obtains the height of water level.
Aforesaid water level and temperature detector for solar water heater, a thermistor is installed in the position near the lowest water level sensing point of measuring probe, is used for measuring the water temperature in the water tank.
Aforesaid water level and temperature detector for solar water heater, the insulation course on the electric conductor surface of measuring probe is the oxide layer of insulating coating or metal compaction.
Aforesaid water level and temperature detector for solar water heater, measuring probe is rigid structure or flexible structure.
Aforesaid water level and temperature detector for solar water heater, the electric conductor of measuring probe are surface deposition layer or coating or conductive film or the conductor braid of whole conductor component or conduction.
Aforesaid water level and temperature detector for solar water heater also are provided with the sensor of measuring temperature on the measuring probe, the sensor of measuring temperature is thermal resistance or thermistor.
The utility model is applicable to the level measuring in the water tank, and such as the solar water heater storage water tank level measuring, or boiler water level is measured humidifier level measuring, and the level measuring of other various types water tank.
The beneficial effects of the utility model are: the multistage water level detecting of solar water heater adopts root water resistance probe in detecting principle, complex structure more at present.And many with the corrosion of electric probe in water, fouling, and the sealing surface problem such as leak causes failure of apparatus easily on the structure.The utility model has solved the problems referred to above, and is simple in structure, in stable condition, and long service life, installs more conveniently, and cost is low.
Description of drawings
Fig. 1 is connection diagram of the present utility model.
Embodiment
Embodiment 1
Present embodiment provides a kind of water level for solar water heater and temperature detector, connects as shown in Figure 1, comprises the capacitance measurement circuit 3 of measuring probe 1, reference electrode 2 and connection amount probe 1 and reference electrode 2; Reference electrode 2 is for being arranged on the conductor that contacts with water in the water tank, and perhaps when tank inner wall was metal, reference electrode 2 was tank inner wall; Measuring probe 1 is arranged in the water tank along the setting of height of water level direction, its length is more than or equal to peak level in the water tank, be provided with continuous electric conductor in the measuring probe 1, electric conductor forms certain girth in probe cross section, the surface area of electric conductor increases with effective detection length of measuring probe, the electric conductor surface coverage of measuring probe 1 or be wrapped in insulation course makes electric conductor and water isolation and the insulation of measuring probe.Position thermistor 4 of installation is used for measuring the water temperature in the water tank near the lowest water level sensing point of probe.
Capacitance measurement circuit 3 multivibrator circuit that the base chip consists of for by CMOS type 555 time, the amount of connecing probe 1 and reference electrode 2 are equivalent to variable capacitor C x, connect between the TR/TH end and ground of 555 chips, power supply VCC charges to capacitor C x by resistance R 1 and R2, after capacitor C x voltage rises to reversal voltage, capacitor C x forms multi-harmonic-oscillations by the DC end discharge of resistance R 2 to 555 chips.After the circuitous resistance parameter was fixing, oscillation frequency was decided by electric capacity, and the frequency of measuring this circuit output can obtain the size of capacitor C x, thereby obtains the height of water level.The electric conductor of realizing probe by the oxide layer of metal compaction or coating and the insulation of water can be adopted in the electric conductor surface of measuring probe 1.Measuring probe 1 can be rigidity, also can be flexible structure.The electric conductor of measuring probe 1 can be complete conductor component, also can be surface deposition layer or the coating of conduction, or conductive film or conductor braid.Measuring probe 1 can be combined into one with the sensor of measuring temperature such as thermal resistance or thermistor becomes the water level temperature measurement probe.
During SEA LEVEL VARIATION, measuring probe 1 water-immersed length is along with variation.Measuring probe 1 water-immersed length is longer, and the electric capacity between measuring probe conductor and the water (reference electrode 2) is larger.Capacitance measurement circuit 3 is converted to electrical quantity (frequency of output square wave) with the capacitance between measuring probe 1 and the reference electrode 2.Like this, the frequency values of metering circuit 3 output square waves has just reflected the water-immersed length of measuring probe.After measuring probe 1 fixed installation, namely can be converted into water level by the frequency of exporting square wave.
In addition to the implementation, the utility model can also have other embodiments.All employings are equal to the technical scheme of replacement or equivalent transformation formation, all drop on the protection domain of the utility model requirement.

Claims (7)

1. water level and a temperature detector that is used for solar water heater is characterized in that: comprise measuring probe (1), reference electrode (2) and the capacitance measurement circuit (3) that connects measuring probe (1) and reference electrode (2); Described reference electrode (2) is for being arranged on the conductor that contacts with water in the water tank, and perhaps when tank inner wall was metal, described reference electrode (2) was tank inner wall; Described measuring probe (1) is arranged in the water tank along the setting of height of water level direction, its length is more than or equal to peak level in the water tank, described measuring probe is provided with continuous electric conductor in (1), electric conductor forms certain girth in probe cross section, the surface area of electric conductor increases with effective detection length of measuring probe, the electric conductor surface coverage of described measuring probe (1) or be wrapped in insulation course makes electric conductor and water isolation and the insulation of measuring probe.
2. water level and temperature detector for solar water heater as claimed in claim 1, it is characterized in that: the multivibrator circuit that described capacitance measurement circuit (3) consists of for the time base chip by CMOS type 555, connect measuring probe (1) and reference electrode (2) is equivalent to variable capacitor C x, connect between the TR/TH end and ground of 555 chips, power supply VCC charges to capacitor C x by resistance R 1 and R2, after capacitor C x voltage rises to reversal voltage, capacitor C x forms multi-harmonic-oscillations by the DC end discharge of resistance R 2 to 555 chips.
3. water level and temperature detector for solar water heater as claimed in claim 1 or 2 is characterized in that: a thermistor is installed in the position near the lowest water level sensing point of described measuring probe (1), is used for measuring the water temperature in the water tank.
4. water level and temperature detector for solar water heater as claimed in claim 1 or 2, it is characterized in that: the insulation course on the electric conductor surface of described measuring probe (1) is the oxide layer of insulating coating or metal compaction.
5. water level and temperature detector for solar water heater as claimed in claim 1 or 2 is characterized in that: described measuring probe (1) is rigid structure or flexible structure.
6. water level and temperature detector for solar water heater as claimed in claim 1 or 2, it is characterized in that: the electric conductor of described measuring probe (1) is surface deposition layer or coating or conductive film or the conductor braid of whole conductor component or conduction.
7. such as claim 1 or described water level and temperature detector for solar water heater, it is characterized in that: also be provided with the sensor of measuring temperature on the described measuring probe (1), the sensor of described measurement temperature is thermal resistance or thermistor.
CN 201220318702 2012-07-02 2012-07-02 Water level and water temperature detecting device for solar water heater Expired - Fee Related CN202869597U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN 201220318702 CN202869597U (en) 2012-07-02 2012-07-02 Water level and water temperature detecting device for solar water heater

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN 201220318702 CN202869597U (en) 2012-07-02 2012-07-02 Water level and water temperature detecting device for solar water heater

Publications (1)

Publication Number Publication Date
CN202869597U true CN202869597U (en) 2013-04-10

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CN 201220318702 Expired - Fee Related CN202869597U (en) 2012-07-02 2012-07-02 Water level and water temperature detecting device for solar water heater

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106289449A (en) * 2015-06-11 2017-01-04 陈俊平 Condenser type water level and flow detection device and kettle, detection method

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106289449A (en) * 2015-06-11 2017-01-04 陈俊平 Condenser type water level and flow detection device and kettle, detection method

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C14 Grant of patent or utility model
GR01 Patent grant
CF01 Termination of patent right due to non-payment of annual fee

Granted publication date: 20130410

Termination date: 20180702

CF01 Termination of patent right due to non-payment of annual fee