CN205351790U - Gas heater takes hot water temperature remotely adjusting device of sensitivity cold water heat capacity compensation - Google Patents

Abstract

The utility model discloses a gas heater takes hot water temperature remotely adjusting device of sensitivity cold water heat capacity compensation comprises a flow testing unit, the 2nd flow testing unit, sensitivity calculating unit, proportion value calculating unit, flow threshold value switch element and proportional valve drive unit. Gas heater adopts the method through two way hot water flow of water valve remote control to change hot water temperature including first hot water delivery port and second hot water delivery port, when first hot water delivery port hot water flow increases relatively, the increase of gas heater's combustion power, hot water temperature rises, when first hot water delivery port hot water flow reduced relatively, gas heater's combustion power reduced, and hot water temperature descends, adjust sensitivity and carry out compensation control by water heater inlet cold water heat capacity size. The device need not wiredly or the wireless remote control ware, can realize gas heater hot water temperature's remotely adjusting, and control results is reliable and stable.

Description

Hot water temperature's long range regulation apparatus that a kind of gas heater compensates with sensitivity cold water thermal capacity

Technical field

This utility model relates to a kind of gas heater, hot water temperature's long range regulation apparatus that especially a kind of gas heater compensates with sensitivity cold water thermal capacity.

Background technology

If gas heater temperature sets improper, bringing very big inconvenience to people, particularly when shower, the gas and hot water actuator temperature without wireless remote control or remote line traffic control cannot regulate, and is easily caused again gas heater with water mixing valve interpolation cold water and stops working.Adopting wireless remote control regulating gas water heater temperature, by the restriction of installation site, a lot of occasion remote controller signals are not transferred to gas heater.When adopting remote line traffic control mode, special waterproof wire remote control devices cost is high, it is necessary to sunkens cord in advance, works for a long time under the wet environments such as bathroom, and the wire remote control devices fault rate of electronic type is high.

Summary of the invention

The purpose of this utility model is to provide a solution for the hot water temperature of distant control gas heater, namely can the device of regulating gas water heater combustion power size at a distance.

To achieve these goals, this utility model provides hot water temperature's long range regulation apparatus that a kind of gas heater compensates with sensitivity cold water thermal capacity, is made up of first flow measuring unit, second flow measuring unit, Calculation of Sensitivity unit, ratio value computing unit, flow threshold switch element and proportioning valve driver element.

Described gas heater has cold water inlet and the first hot water outlet, the second hot water outlet；Before described first hot water outlet, first flow sensor is installed, for detecting outlet hot water's flow of the first hot water outlet；Second flow sensor and cold water temperature sensor are installed after described cold water inlet, are respectively used to entrance cold water total flow and the entrance cold water temperature of detection cold water inlet.

Described first flow measuring unit is made up of first flow sensor and first frequency voltage conversion circuit, is provided with first flow voltage output end；Described second flow measuring unit is made up of second flow sensor and second frequency voltage conversion circuit, is provided with total flow voltage output end.

Described Calculation of Sensitivity unit is made up of cold water temperature sensor and voltage controlled temperature/voltage conversion circuit, is provided with total flow voltage input end and sensitivity controls voltage output end；Described total flow voltage input end is connected to total flow voltage output end.

Described ratio value computing unit is simulation multiplication and division circuit, is provided with the first molecule voltage input end, the second molecule voltage input end, denominator voltage input end and ratio value and controls voltage output end；Described first molecule voltage input end is connected to first flow voltage output end；Described denominator voltage input end is connected to total flow voltage output end；Described second molecule voltage input end is connected to sensitivity and controls voltage output end.

Described flow threshold switch element by flow threshold initialization circuit, compare drive circuit, relay burnt gas switch forms；Described flow threshold initialization circuit is provided with flow threshold voltage output end；The described drive circuit that compares is made up of comparator and relay coil drive circuit；Two inputs of described comparator are respectively connecting to total flow voltage output end, flow threshold voltage output end；Described relay burnt gas switch is driven by relay coil drive circuit.

Described proportioning valve driver element is made up of gas proportion regulating valve and proportioning valve drive circuit；The input of described proportioning valve drive circuit is connected to ratio value and controls voltage output end；The aperture of described gas proportion regulating valve is driven by proportioning valve drive circuit.

First hot water outlet of described gas heater, the second hot water outlet are connected to 2 water inlets of water mixing valve respectively by water pipe.Or, the first hot water outlet of described gas heater, the second hot water outlet are connected to the water inlet of the first adjustment valve, the second adjustment valve respectively by water pipe；Described first adjustment valve, the second outlet connection regulating valve are a water side.

The control system of described gas heater is made up of described device, controller, ignition discharge pin, flame inductive needle, exhaust fan, electromagnetic valve；Gas proportion regulating valve in described device is arranged in fuel gas pipeline after electromagnetic valve.Or, the control system of described gas heater is made up of temperature controller, ignition discharge pin, flame inductive needle, exhaust fan, electromagnetic valve, gas proportion regulating valve, first flow sensor, second flow sensor, cold water temperature sensor；Control circuit in described device includes in temperature controller；Control circuit in described device includes the related circuit in first flow measuring unit, second flow measuring unit, cold water temperature measuring unit, adder circuit unit, ratio value computing unit, flow threshold switch element and proportioning valve driver element.

Described electromagnetic valve is preferably used the safety shutoff valve in gas proportion valve assembly；Described gas proportion regulating valve uses the gas proportion regulating valve in gas proportion valve assembly.

The beneficial effects of the utility model are, without wired or Digiplex, adopt the method change gas flow being controlled two-way hot water flow by water valve, thus changing outlet hot water's temperature of water heater, realize the remote adjustment of gas heater hot water temperature, regulating sensitivity and compensated control by water heater entrance cold water thermal capacity size, result is reliable and stable.

Accompanying drawing explanation

Fig. 1 is hot water temperature's long range regulation apparatus theory diagram that gas heater compensates with sensitivity cold water thermal capacity.

Fig. 2 is that embodiment 1 structured flowchart installed by flow transducer.

Fig. 3 is that embodiment 2 structured flowchart installed by flow transducer.

Fig. 4 is the embodiment of first flow measuring unit 100.

Fig. 5 is the embodiment of Calculation of Sensitivity unit 300.

Fig. 6 is the embodiment of ratio value computing unit 400.

Fig. 7 is the embodiment of flow threshold switch element 500.

Fig. 8 is the embodiment of proportioning valve drive circuit in proportioning valve driver element 600.

Fig. 9 is gas heater classical control system block diagram.

Figure 10 is the gas water heater control system block diagram with temperature remote adjustment function.

Detailed description of the invention

Below in conjunction with embodiment and accompanying drawing, this utility model is described in further detail, but embodiment of the present utility model is not limited to this.

Hot water temperature's long range regulation apparatus theory diagram that gas heater compensates with sensitivity cold water thermal capacity is as it is shown in figure 1, be made up of first flow measuring unit 100, second flow measuring unit 200, Calculation of Sensitivity unit 300, ratio value computing unit 400, flow threshold switch element 500 and proportioning valve driver element 600.

Described gas heater has 1 cold water inlet and 2 hot water outlets, cold water inlet and wherein 1 hot water outlet be separately installed with flow transducer, detect discharge respectively.First flow measuring unit 100 measures the outlet hot water flow Q1 of wherein 1 hot water outlet, and second flow measuring unit 200 measures the entrance cold water total flow Q2 of cold water inlet, and exports with first flow voltage U1, total flow voltage U2 respectively.Total flow voltage U2 is sent to flow threshold switch element 500 and compares with the flow threshold voltage set, and when entrance cold water total flow Q2 is more than the flow threshold set, controls relay burnt gas switch Guan Bi；When entrance cold water total flow Q2 is less than the flow threshold set, controls relay burnt gas switch and disconnect.

Calculation of Sensitivity unit 300 is provided with sensitivity and controls voltage U3 outfan, after Calculation of Sensitivity unit 300 measures entrance cold water temperature T, is converted to sensitivity and controls voltage U3 output.

Calculation of Sensitivity unit 300 is provided with total flow voltage U2 input and sensitivity controls voltage U3 outfan.After Calculation of Sensitivity unit 300 measures entrance cold water temperature T, the size calculating further according to total flow voltage U2 obtains sensitivity control voltage U3 output.

First flow voltage U1, total flow voltage U2, sensitivity control voltage U3 and are sent to ratio value computing unit 400, ratio value computing unit 400 calculates the ratio between first flow voltage U1 and total flow voltage U2, controls voltage U3 calculating further according to this ratio and sensitivity and obtains ratio value control voltage UK；Ratio value controls voltage UK and is sent to proportioning valve driver element 600, UK size control the aperture of gas proportion regulating valve；When UK is minima, the aperture of gas proportion regulating valve is minimum；When UK is maximum, the aperture of gas proportion regulating valve is maximum.

Flow transducer installs embodiment 1 structured flowchart as shown in Figure 2, described device water circuit system is by the heat exchanger 901 in described gas heater, first flow sensor 902, second flow sensor 903, cold water temperature sensor the 907, first hot water outlet the 904, second hot water outlet 905, cold water inlet 906, cold water pipe 921, main hot-water line the 922, first hot-water line the 923, second hot-water line 924, and water mixing valve the 931, first connecting water pipe the 925, second connecting water pipe 926 outside gas heater, heat of mixing water pipe 927, Water outlet spray head 932 form.

Described gas heater has 1 cold water inlet and 2 hot water outlets, and cold water pipe 921 is connected between cold water inlet 906 and heat exchanger 901；One end of first hot-water line 923 is connected to the first hot water outlet 904, and other end is communicated to main hot-water line 922 water side；One end of second hot-water line 924 is connected to the second hot water outlet 905, and other end is communicated to main hot-water line 922 water side；The water intake end of main hot-water line 922 is connected to heat exchanger 901.

Before described first flow sensor 902 is arranged on the first hot water outlet 904, for detecting the outlet hot water flow Q1 of the first hot water outlet 904；After described second flow sensor 903 is arranged on cold water inlet 906, for detecting the entrance cold water total flow Q2 of cold water inlet 906；After described cold water temperature sensor 907 is arranged on cold water inlet 906, for detecting the entrance cold water temperature T of cold water inlet 906.Specifically, first flow sensor 902 is arranged on the first hot-water line 923, and second flow sensor 903 and cold water temperature sensor 907 are arranged on cold water pipe 921；After second flow sensor 903 can be arranged on cold water temperature sensor 907 as shown in Figure 2, it is also possible to before being arranged on cold water temperature sensor 907.

2 water inlets of water mixing valve 931 are connected to first hot water outlet the 904, second hot water outlet 905 of gas heater respectively by first connecting water pipe the 925, second connecting water pipe 926；The outlet of water mixing valve 931 is connected to Water outlet spray head 932 by heat of mixing water pipe 927.When water mixing valve 931 is cold water, hot water water mixing valve, the first connecting water pipe 925 is connected to the water inlet of hot water of water mixing valve 931, and the second connecting water pipe 926 is connected to the cold water inlet of water mixing valve 931.The outlet hot water flow Q1 of the first hot water outlet 904 and entrance cold water total flow Q2 of cold water inlet 906 is changed by regulating mixed water valve 931.

Flow transducer installs embodiment 2 structured flowchart as it is shown on figure 3, be different in that with embodiment 1, uses the first adjustment valve 933, second to regulate valve 934 and replaces water mixing valve 931；First water inlet regulating valve 933 is connected to the first hot water outlet 904 of gas heater through the first connecting water pipe 925, and the second water inlet regulating valve 934 is connected to the second hot water outlet 905 of gas heater through the second connecting water pipe 926.The first outlet connection regulating valve the 933, second adjustment valve 934 is that a water side is connected with heat of mixing water pipe 927.Outlet hot water's flow of first hot water outlet the 904, second hot water outlet 905 changes respectively through regulating first adjustment valve the 933, second adjustment valve 934；Outlet hot water's flow sum of first hot water outlet the 904, second hot water outlet 905 is equal to the entrance cold water total flow Q2 of cold water inlet 906.

The embodiment of first flow measuring unit 100 as shown in Figure 4, is provided with first flow voltage output end.First flow sensor 902 selects the Hall water flow sensor of low cost, and sensor is output as the pulse frequency proportional to flow.First flow measuring unit 100 is made up of first flow sensor 902 and frequency-voltage conversion circuit.In embodiment illustrated in fig. 4, frequency-voltage conversion circuit is made up of single-chip integration frequency/voltage converter 101 and its peripheral cell the 11st resistance the 102, the 12nd resistance the 104, the 13rd resistance 106, electric capacity 103, electric capacity 105, the model of single-chip integration frequency/voltage converter 101 is LM2917, the pin 10 of LM2917 is first flow voltage output end, exports first flow voltage U1.Frequency-voltage conversion circuit can also adopt other to be capable of the circuit of frequency/voltage translation function.

Second flow measuring unit 200 is made up of second flow sensor 903 and frequency-voltage conversion circuit, second flow sensor 903 selects the Hall water flow sensor of low cost, the principle of its frequency-voltage conversion circuit is identical with the frequency-voltage conversion circuit in first flow measuring unit 100 with structure, it is provided with total flow voltage output end, exports total flow voltage U2.

First flow measuring unit 100, second flow measuring unit 200 can also adopt other measurement scheme, for instance, the flow transmitter being respectively adopted integration measures Q1, Q2, and the flow transmitter of integration directly exports U1, U2.

First flow measuring unit 100 detects Q1, and output is proportional relationship between U1, U1 and Q1

U1=KQ Q1；

Second flow measuring unit 200 detects Q2, and output is proportional relationship between U2, U2 and Q2

U2=KQ Q2；

KQ in 2 expression formulas is flow measurement coefficient above.First flow measuring unit 100 is identical with the flow measurement coefficient of second flow measuring unit 200.

After Calculation of Sensitivity unit 300 measures entrance cold water temperature T, be converted to sensitivity and control voltage U3 output.If the minimum of entrance cold water temperature is TL, peak is TH, and entrance cold water temperature T is in interval [TL, TH] change.The function of Calculation of Sensitivity unit 300 is: when entrance cold water temperature T is equal to minimum TL, and sensitivity controls voltage U3 equal to maximum U3max；When entrance cold water temperature T is equal to peak TH, sensitivity controls voltage U3 equal to minima U3min；Entrance cold water temperature T is when interval [TL, TH] changes, and sensitivity controls voltage U3 and reduces along with the increase of entrance cold water temperature T.

Calculation of Sensitivity unit 300 is provided with total flow voltage input end and sensitivity controls voltage output end, after measuring entrance cold water temperature T, calculates according to the size of total flow voltage U2 and obtains sensitivity control voltage U3 output.If the minimum of entrance cold water temperature is TL, peak is TH, and entrance cold water temperature T is in interval [TL, TH] change.The function of Calculation of Sensitivity unit 300 is: entrance cold water temperature T is when interval [TL, TH] changes, and sensitivity controls voltage U3 and reduces along with the increase of entrance cold water temperature T, increases along with the reduction of entrance cold water temperature T；Meanwhile, sensitivity controls voltage U3 and increases along with the increase of total flow voltage U2, reduces along with the reduction of total flow voltage U2.

The embodiment of Calculation of Sensitivity unit 300 is as it is shown in figure 5, be made up of cold water temperature sensor 907, amplifier the 301, the 8th resistance the 302, the 9th resistance the 303, the tenth resistance 304, and cold water temperature sensor 907 selects NTC thermistor.Amplifier the 301, the 8th resistance the 302, the 9th resistance the 303, the tenth resistance 304 forms voltage controlled temperature/voltage conversion circuit.

If in embodiment illustrated in fig. 5, the resistance of cold water temperature sensor 907 is RT, resistance respectively R2, R3, R4 of the 8th resistance the 302, the 9th resistance the 303, the tenth resistance 304, then have

$U3=\frac{R3+R4}{R3}\·\frac{RT}{R2+RT}\·U2=KT\·\frac{RT}{R2+RT}\·U2;$

Therein

$KT=\frac{R3+R4}{R3}$

For fixed value.In embodiment illustrated in fig. 5, total flow voltage U2 is the input voltage of the bleeder circuit of the 8th resistance 302 and NTC thermistor composition, and sensitivity controls voltage U3 and controlled by total flow voltage U2, is proportional relationship between U3 and U2.

In embodiment illustrated in fig. 5, when entrance cold water temperature T declines, RT increases, and sensitivity controls voltage U3 and increases；When entrance cold water temperature T rises, RT reduces, and sensitivity controls voltage U3 and reduces.It addition, in embodiment illustrated in fig. 5, U3 and U2 is proportional relationship, also it is proportional relationship between total flow voltage U2 and entrance cold water total flow Q0, therefore, sensitivity controls voltage U3 and increases along with the increase of entrance cold water total flow Q2, reduces along with the reduction of entrance cold water total flow Q2.Actually, when entrance cold water temperature T declines, or during entrance cold water total flow Q2 increase, all reflect that the thermal capacity of the water needing heating in the gas heater unit interval increases, therefore, sensitivity controls the increase of voltage U3 and helps speed up adjustment, makes combustion power increase, it is ensured that the range of accommodation of temperature.

Ratio value computing unit 400 is provided with the first molecule voltage input end, the second molecule voltage input end, denominator voltage input end and ratio value and controls voltage output end.Described first molecule voltage input end is connected to first flow voltage output end, inputs first flow voltage U1；Described denominator voltage input end is connected to total flow voltage output end, inputs total flow voltage U2；Described second molecule voltage input end is connected to sensitivity and controls voltage output end, and input sensitivity controls voltage U3.Ratio value computing unit 400 is output as ratio value and controls voltage UK, and embodiment as shown in Figure 6, is made up of parallel A/D converter 401, parallel D/A converter 402,555 part on time base apparatus the 411, first resistance the 412, second resistance 413, electric capacity 414.

The model of parallel A/D converter 401 is 8 parallel-by-bit A/D converter ADC0841.555 time base apparatus part the 411, first resistance the 412, second resistance 413, electric capacity 414 form agitator, the recurrent pulse of agitator output is connected to the startup conversion inputs WR of parallel A/D converter 401, each pulse starts an A/D conversion, makes parallel A/D converter 401 be operated in Automatic continuous translative mode.

The analog voltage input negative terminal VIN-of ADC0841, output Enable Pin RD, chip select end CS, digitally DGND, simulation ground AGND are connected to publicly, and the power end VCC of ADC0841 is connected to positive supply+VDD.During the output Enable Pin RD input low level of ADC0841, its data output end DB7～DB0 maintains output effectively.When, after ADC0841 each time EOC, automatically result being exported from data output end DB7～DB0.

U1 is connected to analog voltage input VIN+, the U2 of ADC0841 and is connected to the reference voltage input terminal VREF of ADC0841.If 8 position digital signals of ADC0841 outfan DB7～DB0 output are X, its maximum is 255.Then have

$X=255\×\frac{VIN+}{VREF}=255\×\frac{U1}{U2};$

Namely the ratio between two input voltages U1, U2 is

$\frac{U1}{U2}=\frac{X}{2S5}.$

The model of parallel D/A converter 402 is 8 parallel-by-bit D/A converter AD5330.The parallel data input of AD5330 is DB7～DB0, and reference voltage input is VREF, changes voltage output end into VOUT.

The buffer switch of AD5330 controls end BUF, export ratio controls end GAIN, input register controls end WR, DAC register controlled end LDAC, chip select end CS, hold GND to be connected to publicly, the clear terminal CLR of AD5330, low power consumption control end PD, power end VDD are connected to positive supply+VDD.When the input register of AD5330 controls end WR and DAC register controlled end LDAC input low level, being in direct D/A transition status, when being left out transfer lag, conversion voltage output end VOUT reflects the data transformation result of parallel data input DB7～DB0 in real time.

The parallel data input DB7～DB0 of AD5330 is connected to the parallel data outfan DB7～DB0 of ADC0841, and the data of input are X, and its maximum is 255.Input is that sensitivity controls voltage U3 to the voltage of AD5330 reference voltage input VREF, and the voltage changing voltage output end VOUT output is UK, then have

$UK=VREF\·\frac{X}{255}=U3\·\frac{X}{255};$

Considering the input/output relation of AD0841, ratio value computing unit 400 is according to formula

$UK=U3\·\frac{U1}{U2},$

According to the ratio between first flow voltage U1 and total flow voltage U2, and sensitivity controls voltage U3 calculating and obtains ratio value control voltage UK.U3 is the maximum that ratio value controls voltage UK, and its size adjustment ratio value controls the sensitivity of voltage UK.When entrance cold water temperature T declines or entrance cold water total flow Q2 increases, sensitivity controls voltage U3 and increases, and adjustment ratio value controls the sensitivity of voltage UK to be increased, and ratio value controls the maximum of voltage UK to be increased；When entrance cold water temperature T rises or entrance cold water total flow Q2 reduces, sensitivity controls voltage U3 and reduces, and adjustment ratio value controls the sensitivity of voltage UK and declines, and ratio value controls the maximum of voltage UK and reduces.When entrance cold water temperature T is peak TH and entrance cold water total flow Q2 is the minima allowed, it is minima U3min that sensitivity controls voltage U3；When entrance cold water temperature T is minimum TL and nominal maximum that entrance cold water total flow Q2 is gas heater, it is maximum U3max that sensitivity controls voltage U3.Cold water thermal capacity only serves compensating action in adjustment process, and therefore the minima U3min of sensitivity control voltage U3 is chosen as 0.4～1 times of maximum U3max.When U3min is equal to U3max, described device does not have sensitivity cold water thermal capacity to compensate function.

Sensitivity controls the minima U3min and maximum U3max of voltage U3 and realizes by adjusting component parameters in Calculation of Sensitivity unit 300.

Calculation of Sensitivity unit 300 can also use the circuit outside embodiment illustrated in fig. 5.Such as, cold water temperature sensor 907 can adopt PTC thermistor, now, by the location swap of cold water temperature sensor in embodiment illustrated in fig. 5 907 and the 8th resistance 302.More flexible in order to adjust when sensitivity controls the minima U3min and maximum U3max of voltage U3, can one resistance of parallel connection on cold water temperature sensor 907 in the embodiment shown in fig. 5.It addition, when using NTC thermistor, PTC thermistor as cold water temperature sensor 907, it is also possible to adopt resistance bridge to measure cold water temperature sensor 907 resistance change that variations in temperature causes.

It is not high that embodiment illustrated in fig. 6 is applicable to comparative example value calculating rate request, and the occasion that input voltage change is shallower.Due in this utility model U1, U2 reflection be water heater flow, change is mild, therefore is suitable for.Ratio value computing unit 400 can also adopt other analog dividers, analog multiplier circuit, such as, use the integrated analog multipliers such as AD734, AD534/analog divider of divider composition, analog multiplier circuit to calculate according to U1, U2, U3 and obtain UK.

Flow threshold switch element 500 inputs total flow voltage U2, exports the switching signal relevant to flow threshold QY.The embodiment of flow threshold switch element 500 is as shown in Figure 7, being made up of comparator the 501, the 3rd resistance the 502, the 4th resistance the 503, the 5th resistance 504, audion the 505, first fly-wheel diode 506, relay coil 507, relay burnt gas switch 508, the switching signal relevant to flow threshold QY is Guan Bi and the disconnection of relay burnt gas switch 508.

In embodiment illustrated in fig. 7, the bleeder circuit of the 3rd resistance the 502, the 4th resistance 503 composition is flow threshold QY initialization circuit, is provided with flow threshold voltage output end, the flow threshold voltage UY that output sets；Change the intrinsic standoff ratio of the 3rd resistance the 502, the 4th resistance 503, it is possible to change the flow threshold QY set.The relation of flow threshold voltage UY and flow threshold QY is

$QY=\frac{UY}{KQ}.$

Comparator the 501, the 5th resistance 504, audion the 505, first fly-wheel diode 506, relay coil 507 form the comparison drive circuit of relay burnt gas switch 508.

When entrance cold water total flow Q2 is more than flow threshold QY, total flow voltage U2 is more than flow threshold voltage UY, and comparator 501 exports high level, and audion 505 turns on, and relay coil 507 obtains electric, and relay burnt gas switch 508 closes；When entrance cold water total flow Q2 is less than flow threshold QY, relay burnt gas switch 508 disconnects.Flow threshold QY is the aforesaid entrance cold water total flow Q2 minima allowed.

Proportioning valve driver element 600 is made up of gas proportion regulating valve and proportioning valve drive circuit, and the input of proportioning valve drive circuit is connected to ratio value and controls voltage output end, and the aperture of gas proportion regulating valve is driven by proportioning valve drive circuit.

The embodiment of proportioning valve drive circuit as shown in Figure 8, is made up of power amplifier the 601, the 6th resistance the 602, the 7th resistance the 603, second fly-wheel diode 604.Second fly-wheel diode 604 is connected in parallel on ratio coil 630.Its operation principle is: could alter that the flow of combustion gas by changing the aperture of gas proportion regulating valve, thus changing the combustion power of gas heater, changes hot water temperature.Specifically have: when ratio value controls voltage UK increase, proportioning valve drive circuit output voltage UB increases, and on ratio coil 630, electric current increases, and the aperture of gas proportion regulating valve increases, and the combustion power of gas heater increases, hot water temperature's rising；When ratio value controls voltage UK reduction, proportioning valve drive circuit output voltage UB reduces, and on ratio coil 630, electric current reduces, and the aperture of gas proportion regulating valve reduces, and the combustion power of gas heater reduces, hot water temperature's decline.

6th resistance the 602, the 7th resistance 603 is for adjusting the scope of proportioning valve drive circuit output voltage UB, when ratio value controls voltage UK equal to its maximum controlling voltage UM, ratio coil 630 flows through maximum controlling current, i.e. rated current, make the aperture of gas proportion regulating valve reach maximum.

Proportioning valve drive circuit can use other kinds of drive circuit, for instance, audion power driving circuit, voltage/PWM changes and PWM drive circuit, etc..The function of proportioning valve drive circuit is: when ratio value controls voltage UK increase, controls electric current on ratio coil 630 and increases；When ratio value controls voltage UK reduction, control electric current on ratio coil 630 and reduce；When ratio value control voltage UK is maximum UM, controlling electric current on ratio coil 630 is rated current.

The classical control system block diagram of gas heater is as it is shown in figure 9, be made up of controller 10, water-control switch 11, ignition discharge pin 12, flame inductive needle 13, exhaust fan 14, electromagnetic valve 15.Its operation principle is: after opening water outlet of water heater tap, and water-control switch 11 closes, and controller 10 controls exhaust fan 14 and obtains electric work, controls igniting spray point 12 discharge igniting simultaneously；Slightly postpone a moment and control electromagnetic valve 15 adhesive, turn on the gas-fire；Dimension igniting tens seconds held by ignition discharge pin 12, it is ensured that the reliability of igniting；After electric discharge terminates, flame inductive needle 13 is used to determine whether to light a fire successfully, and controller 10 is sensed by flame inductive needle 13 lights a fire successfully, then control to maintain electromagnetic valve 15 adhesive, turn on the gas-fire；Sensing that igniting is unsuccessful, then control electromagnetic valve 15 and upspring, turn off coal gas, water heater stops heating.

For ensureing the use safety of gas heater, gas heater can also include blast switch 16 as shown in Figure 9 and temperature detect switch (TDS) 17.In water heater use procedure, if blast switch 16 detects that exhaust fan is not actuated, or temperature detect switch (TDS) 17 detects that fire makes too greatly leaving water temperature too high, or water-control switch 11 detects when current are too little, capital makes electromagnetic valve 15 upspring, and turns off coal gas, it is to avoid cause security incident.

When gas heater uses device described in the utility model, its control system is made up of the controller 10 of described device and system shown in Figure 9, ignition discharge pin 12, flame inductive needle 13, exhaust fan 14, electromagnetic valve 15, or can also include blast switch 16, temperature detect switch (TDS) 17 by selectivity.Water-control switch 11 in gas heater classical control system shown in Fig. 9 is substituted by the relay burnt gas switch 508 in device described in the utility model, after the gas proportion regulating valve in device described in the utility model is arranged in fuel gas pipeline electromagnetic valve 15.Owing to conventional gas proportion valve assembly having generally included gas proportion regulating valve and safety shutoff valve, therefore, electromagnetic valve 15 in gas heater classical control system shown in Fig. 9 is preferably used the safety shutoff valve in gas proportion valve assembly, and gas proportion regulating valve uses the gas proportion regulating valve in gas proportion valve assembly.

When gas heater uses device of the present invention, described controller 10 can use current various popular gas water heater ignition controller, such as, DKG2 controller, DKG3 controller, DHS-B7A controller, DHS-B7B controller, HD7PQA1-CP controller, and other gas water heater ignition controllers various.

When gas heater uses device described in the utility model, it is possible to the control circuit in device described in the utility model is merged with described controller 10, forms new temperature controller.It is the gas water heater control system block diagram with temperature remote adjustment function as shown in Figure 10, it is made up of temperature controller 20, ignition discharge pin 12, flame inductive needle 13, exhaust fan 14, electromagnetic valve 15, gas proportion regulating valve 21, first flow sensor 902, second flow sensor 903, cold water temperature sensor 907, or blast switch 16, temperature detect switch (TDS) 17 can also be included by selectivity.Temperature controller 20 is made up of with the control circuit in device described in the utility model the functional circuit in described controller 10, and the control circuit in device described in the utility model includes the related circuit in first flow measuring unit 100, second flow measuring unit 200, Calculation of Sensitivity unit 300, ratio value computing unit 400, flow threshold switch element 500 and proportioning valve driver element 600.Similarly, the electromagnetic valve 15 in Figure 10 is preferably used the safety shutoff valve in gas proportion valve assembly, and gas proportion regulating valve 21 uses the gas proportion regulating valve in gas proportion valve assembly.

The foregoing is only embodiment of the present utility model, be not limited to this utility model, for a person skilled in the art, this utility model can have various modifications and variations.All within spirit of the present utility model and principle, any amendment of making, equivalent replacement, improvement etc., should be included within right of the present utility model.

Claims (10)

1. hot water temperature's long range regulation apparatus that a gas heater compensates with sensitivity cold water thermal capacity, it is characterised in that:

It is made up of first flow measuring unit, second flow measuring unit, Calculation of Sensitivity unit, ratio value computing unit, flow threshold switch element and proportioning valve driver element；

Described gas heater has cold water inlet and the first hot water outlet, the second hot water outlet；Before described first hot water outlet, first flow sensor is installed, for detecting outlet hot water's flow of the first hot water outlet；Second flow sensor and cold water temperature sensor are installed after described cold water inlet, are respectively used to entrance cold water total flow and the entrance cold water temperature of detection cold water inlet；

Described first flow measuring unit is made up of first flow sensor and first frequency voltage conversion circuit, is provided with first flow voltage output end；Described second flow measuring unit is made up of second flow sensor and second frequency voltage conversion circuit, is provided with total flow voltage output end；

Described Calculation of Sensitivity unit is made up of cold water temperature sensor and voltage controlled temperature/voltage conversion circuit, is provided with total flow voltage input end and sensitivity controls voltage output end；Described total flow voltage input end is connected to total flow voltage output end；

Described ratio value computing unit is simulation multiplication and division circuit, is provided with the first molecule voltage input end, the second molecule voltage input end, denominator voltage input end and ratio value and controls voltage output end；Described first molecule voltage input end is connected to first flow voltage output end；Described denominator voltage input end is connected to total flow voltage output end；Described second molecule voltage input end is connected to sensitivity and controls voltage output end；

Described flow threshold switch element by flow threshold initialization circuit, compare drive circuit, relay burnt gas switch forms；Described flow threshold initialization circuit is provided with flow threshold voltage output end；The described drive circuit that compares is made up of comparator and relay coil drive circuit；Two inputs of described comparator are respectively connecting to total flow voltage output end, flow threshold voltage output end；Described relay burnt gas switch is driven by relay coil drive circuit；

Described proportioning valve driver element is made up of gas proportion regulating valve and proportioning valve drive circuit；The input of described proportioning valve drive circuit is connected to ratio value and controls voltage output end；The aperture of described gas proportion regulating valve is driven by proportioning valve drive circuit.

2. hot water temperature's long range regulation apparatus that gas heater as claimed in claim 1 compensates with sensitivity cold water thermal capacity, it is characterised in that: the first hot water outlet of described gas heater, the second hot water outlet are connected to 2 water inlets of water mixing valve respectively by water pipe.

3. hot water temperature's long range regulation apparatus that gas heater as claimed in claim 1 compensates with sensitivity cold water thermal capacity, it is characterised in that: the first hot water outlet of described gas heater, the second hot water outlet are connected to the water inlet of the first adjustment valve, the second adjustment valve respectively by water pipe；Described first adjustment valve, the second outlet connection regulating valve are a water side.

4. hot water temperature's long range regulation apparatus that gas heater as claimed in claim 1 compensates with sensitivity cold water thermal capacity, it is characterised in that: the control system of described gas heater is made up of described device, controller, ignition discharge pin, flame inductive needle, exhaust fan, electromagnetic valve；Gas proportion regulating valve in described device is arranged in fuel gas pipeline after electromagnetic valve.

5. hot water temperature's long range regulation apparatus that gas heater as claimed in claim 1 compensates with sensitivity cold water thermal capacity, it is characterised in that: the control system of described gas heater is made up of temperature controller, ignition discharge pin, flame inductive needle, exhaust fan, electromagnetic valve, gas proportion regulating valve, first flow sensor, second flow sensor, cold water temperature sensor；Control circuit in described device includes in temperature controller；Control circuit in described device includes the related circuit in first flow measuring unit, second flow measuring unit, cold water temperature measuring unit, adder circuit unit, ratio value computing unit, flow threshold switch element and proportioning valve driver element.

6. hot water temperature's long range regulation apparatus that the gas heater as described in claim 4 or claim 5 compensates with sensitivity cold water thermal capacity, it is characterised in that: described electromagnetic valve uses the safety shutoff valve in gas proportion valve assembly；Described gas proportion regulating valve uses the gas proportion regulating valve in gas proportion valve assembly.

7. hot water temperature's long range regulation apparatus that gas heater as claimed in claim 1 compensates with sensitivity cold water thermal capacity, it is characterised in that: described ratio value computing unit by parallel A/D converter, parallel D/A converter, 555 time base apparatus part, the first resistance (412), the second resistance (413), electric capacity (414) forms.

8. hot water temperature's long range regulation apparatus that gas heater as claimed in claim 1 compensates with sensitivity cold water thermal capacity, it is characterised in that: described flow threshold switch element is made up of comparator, the 3rd resistance (502), the 4th resistance (503), the 5th resistance (504), audion (505), the first fly-wheel diode (506), relay coil, relay burnt gas switch.

9. hot water temperature's long range regulation apparatus that gas heater as claimed in claim 1 compensates with sensitivity cold water thermal capacity, it is characterised in that: described proportioning valve drive circuit is made up of power amplifier, the 6th resistance (602), the 7th resistance (603), the second fly-wheel diode (604).

10. hot water temperature's long range regulation apparatus that gas heater as claimed in claim 1 compensates with sensitivity cold water thermal capacity, it is characterised in that: described cold water temperature measuring unit is made up of cold water temperature sensor, amplifier (301), the 8th resistance (302), the 9th resistance (303), the tenth resistance (304)；Described cold water temperature sensor selects NTC thermistor.