CN105546831B - Gas heater combustion power remote regulating device with sensitivity cold water temperature compensation - Google Patents

Abstract

The invention discloses a combustion power remote adjustment device for a gas water heater with sensitivity cold water temperature compensation, which consists of a first flow measurement unit, a second flow measurement unit, a cold water temperature measurement unit, a proportional value calculation unit, a flow threshold switch unit and a proportional valve Composition of the drive unit. The gas water heater includes a first hot water outlet and a second hot water outlet, and the temperature of the hot water is changed by remotely controlling the two-way hot water flow through a water valve; when the hot water flow of the first hot water outlet increases relatively, When it is large, the combustion power of the gas water heater increases and the temperature of the hot water rises; when the flow of hot water at the first hot water outlet decreases relatively, the combustion power of the gas water heater decreases and the temperature of the hot water decreases; the adjustment sensitivity is determined by the temperature of the cold water at the inlet of the water heater Perform compensation control. The device does not need a wired or wireless remote controller, can realize remote adjustment of the hot water temperature of the gas water heater, and the control result is stable and reliable.

Description

Combustion power remote adjustment device with sensitivity cold water temperature compensation for gas water heater

technical field

The invention relates to a gas water heater, in particular to a combustion power remote adjustment device for the gas water heater with sensitivity cold water temperature compensation.

Background technique

If the temperature of the gas water heater is not set properly, it will bring great inconvenience, especially in the shower, the temperature of the gas water heater without wireless remote control or long-distance wire control cannot be adjusted, and adding cold water with the mixing valve will easily lead to gas The water heater is turned off. The wireless remote control is used to adjust the temperature of the gas water heater. Due to the limitation of the installation location, the remote control signal cannot be transmitted to the gas water heater in many occasions. When the long-distance wire control method is used, the special waterproof wired remote control is expensive, and it needs to be embedded in advance. It works in a humid environment such as a bathroom for a long time, and the electronic wired remote control has a high failure rate.

Contents of the invention

The purpose of the present invention is to provide a solution for remote control of the hot water temperature of the gas water heater, that is, a device capable of remotely adjusting the combustion power of the gas water heater.

In order to achieve the above object, the present invention provides a remote adjustment device for combustion power of a gas water heater with sensitivity cold water temperature compensation, which consists of a first flow measurement unit, a second flow measurement unit, a cold water temperature measurement unit, a proportional value calculation unit, and a flow threshold It consists of a switch unit and a proportional valve drive unit.

The gas water heater has a cold water inlet, a first hot water outlet, and a second hot water outlet; a first flow sensor is installed before the first hot water outlet to detect the outlet of the first hot water outlet Hot water flow: a second flow sensor and a cold water temperature sensor are installed behind the cold water inlet, which are respectively used to detect the total flow of cold water at the inlet of the cold water and the temperature of the inlet cold water.

The first flow measurement unit converts the outlet hot water flow of the first hot water outlet detected by the first flow sensor into a first flow voltage output; the second flow measurement unit converts the cold water flow detected by the second flow sensor The total flow of cold water at the water inlet is converted into a voltage output of the total flow; after the cold water temperature measuring unit measures the temperature of the cold water at the inlet and outlet, it is converted into a sensitivity control voltage output.

The proportional value calculating unit calculates and outputs a proportional value control voltage according to the ratio between the first flow voltage and the total flow voltage, and the sensitivity control voltage.

The flow threshold switch unit is composed of a flow threshold setting circuit, a comparison drive circuit, and a relay gas switch; the flow threshold setting circuit outputs a flow threshold voltage, and the flow threshold is determined by the flow threshold voltage; the function of the flow threshold switch unit is: When the total flow voltage is greater than the flow threshold voltage, the total flow of the inlet cold water is greater than the flow threshold, and the relay gas switch is closed; when the total flow voltage is lower than the flow threshold voltage, the total flow of the inlet cold water is less than the flow threshold, and the relay gas switch is turned off.

The proportional valve driving unit is composed of a gas proportional regulating valve and a proportional valve driving circuit; the function of the proportional valve driving circuit is: when the proportional value control voltage increases, the proportional valve driving circuit controls the opening of the gas proportional regulating valve to increase. Larger, the combustion power of the gas water heater increases; when the proportional value control voltage decreases, the proportional valve driving circuit controls the opening of the gas proportional regulating valve to decrease, and the combustion power of the gas water heater decreases.

The cold water flowing in from the cold water inlet is heated and flows out from the first hot water outlet and the second hot water outlet; the total flow of cold water at the cold water inlet is equal to the first hot water outlet and the second hot water outlet The sum of the outlet hot water flow.

The first flow voltage is proportional to the outlet hot water flow of the first hot water outlet; the total flow voltage is proportional to the total flow of cold water at the cold water inlet; the flow threshold voltage and There is a direct proportional relationship between the flow thresholds.

The ratio between the total flow voltage and the total inlet cold water flow of the cold water inlet is equal to the ratio between the first flow voltage and the outlet hot water flow of the first hot water outlet; the flow threshold voltage and the flow threshold The proportional value between is equal to the proportional value between the first flow voltage and the outlet hot water flow of the first hot water outlet.

The function of the cold water temperature measuring unit is: when the inlet cold water temperature is the lowest value, the sensitivity control voltage is equal to the maximum value; when the inlet cold water temperature is the highest value, the sensitivity control voltage is equal to the minimum value; When changing between, the sensitivity control voltage decreases with the increase of inlet cold water temperature.

The proportional value calculation unit calculates and outputs the proportional value control voltage according to the ratio between the first flow voltage and the total flow voltage and the sensitivity control voltage; the proportional value control voltage and the ratio are in a direct proportional relationship; There is a direct proportional relationship between the proportional value control voltage and the sensitivity control voltage.

The outlet hot water flow rate of the first hot water outlet and the second hot water outlet is adjusted and changed by the water mixing valve; the two water inlets of the water mixing valve are respectively connected to the first hot water outlet of the gas water heater by water pipes. water outlet, the second hot water outlet. Alternatively, the outlet hot water flows of the first hot water outlet and the second hot water outlet are regulated and changed by the first regulating valve and the second regulating valve respectively; the water inlet of the first regulating valve is connected to the The first hot water outlet of the gas water heater and the water inlet of the second regulating valve are connected to the second hot water outlet of the gas water heater through a water pipe; the water outlets of the first regulating valve and the second regulating valve are connected to form a water outlet .

The control system of the gas water heater is composed of the device, a controller, an ignition discharge needle, a flame sensing needle, an exhaust fan, and a solenoid valve; the gas proportional regulating valve in the device is installed behind the solenoid valve in the gas pipeline. Alternatively, the control system of the gas water heater is composed of a temperature adjustment controller, an ignition discharge needle, a flame sensor needle, an exhaust fan, a solenoid valve, a gas proportional regulating valve, a first flow sensor, a second flow sensor, and a cold water temperature sensor; The control circuit in the device is included in the temperature regulation controller; the control circuit in the device includes a first flow measurement unit, a second flow measurement unit, a cold water temperature measurement unit, a proportional value calculation unit, a flow threshold switch unit and Corresponding circuit in the proportional valve drive unit.

The electromagnetic valve is preferably a safety cut-off valve in the gas proportional valve assembly; the gas proportional regulating valve is a gas proportional regulating valve in the gas proportional valve assembly.

The beneficial effect of the present invention is that without wired or wireless remote controller, the method of controlling the two-way hot water flow through the water valve is used to change the gas flow, thereby changing the outlet hot water temperature of the water heater, and realizing the remote adjustment of the hot water temperature of the gas water heater. The sensitivity is compensated and controlled by the inlet cold water temperature of the water heater, and the result is stable and reliable.

Description of drawings

Figure 1 is a schematic block diagram of a combustion power remote adjustment device for a gas water heater with sensitivity cold water temperature compensation.

Fig. 2 is a structural block diagram of the first embodiment of the installation of the flow sensor.

Fig. 3 is a structural block diagram of the installation embodiment 2 of the flow sensor.

FIG. 4 is an embodiment of the first flow measurement unit 100 .

FIG. 5 is an embodiment of a cold water temperature measuring unit 300 .

FIG. 6 is an embodiment of the proportional value calculation unit 400 .

FIG. 7 is an embodiment of a flow threshold switch unit 500 .

FIG. 8 is an embodiment of the proportional valve driving circuit in the proportional valve driving unit 600 .

Fig. 9 is a block diagram of a conventional control system of a gas water heater.

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

Detailed ways

The present invention will be further described in detail below in conjunction with the embodiments and the accompanying drawings, but the embodiments of the present invention are not limited thereto.

The principle block diagram of the combustion power remote adjustment device for gas water heaters with sensitivity cold water temperature compensation is shown in Figure 1. The switch unit 500 and the proportional valve drive unit 600 are composed.

The gas water heater has one cold water inlet and two hot water outlets, flow sensors are respectively installed at the cold water inlet and one of the hot water outlets to detect the water flow respectively. The first flow measuring unit 100 measures the outlet hot water flow Q1 of one of the hot water outlets, the second flow measuring unit 200 measures the total inlet cold water flow Q2 of the cold water inlet, and respectively uses the first flow voltage U1 and the total flow voltage U2 output. The total flow voltage U2 is sent to the flow threshold switch unit 500 for comparison with the set flow threshold voltage. When the total inlet cold water flow Q2 is greater than the set flow threshold, the gas switch of the control relay is closed; when the inlet cold water total flow Q2 is less than the set flow threshold When the flow threshold is set, the gas switch of the control relay is disconnected.

The cold water temperature measurement unit 300 is provided with a sensitivity control voltage U3 output terminal. After the cold water temperature measurement unit 300 measures the inlet and outlet cold water temperature T, it is converted into a sensitivity control voltage U3 output.

The first flow voltage U1, the total flow voltage U2, and the sensitivity control voltage U3 are sent to the proportional value calculation unit 400, and the proportional value calculation unit 400 calculates the ratio between the first flow voltage U1 and the total flow voltage U2, and then according to the ratio and The sensitivity control voltage U3 is calculated to obtain the proportional value control voltage UK; the proportional value control voltage UK is sent to the proportional valve drive unit 600, and the opening of the gas proportional regulating valve is controlled by UK; when UK is the minimum value, the gas proportional regulating valve The opening degree is the smallest; when UK is the maximum value, the opening degree of the gas proportional regulating valve is the largest.

The structural block diagram of flow sensor installation embodiment 1 is shown in Figure 2. The water system of the device consists of a heat exchanger 901 in the gas water heater, a first flow sensor 902, a second flow sensor 903, a cold water temperature sensor 907, a first Hot water outlet 904, second hot water outlet 905, cold water inlet 906, cold water pipe 921, main hot water pipe 922, first hot water pipe 923, second hot water pipe 924, and mixing The water valve 931, the first connecting water pipe 925, the second connecting water pipe 926, the mixing hot water pipe 927, and the water outlet nozzle 932 are composed.

The gas water heater has one cold water inlet and two hot water outlets, the cold water pipe 921 is connected between the cold water inlet 906 and the heat exchanger 901; one end of the first hot water pipe 923 is connected to the first hot water outlet The water outlet 904, the other end is connected to the water outlet of the main hot water pipe 922; one end of the second hot water pipe 924 is connected to the second hot water outlet 905, and the other end is connected to the water outlet of the main hot water pipe 922; the main hot water pipe 922 The water inlet end is connected to the heat exchanger 901.

The first flow sensor 902 is installed before the first hot water outlet 904 for detecting the outlet hot water flow Q1 of the first hot water outlet 904; the second flow sensor 903 is installed after the cold water inlet 906, The cold water temperature sensor 907 is installed behind the cold water inlet 906 and used to detect the inlet cold water temperature T of the cold water inlet 906 . Specifically, the first flow sensor 902 is installed on the first hot water pipe 923, the second flow sensor 903 and the cold water temperature sensor 907 are installed on the cold water pipe 921; the second flow sensor 903 can be installed on the cold water pipe as shown in FIG. After the temperature sensor 907, it can also be installed before the cold water temperature sensor 907.

The two water inlets of the mixing valve 931 are respectively connected to the first hot water outlet 904 and the second hot water outlet 905 of the gas water heater by the first connecting water pipe 925 and the second connecting water pipe 926; the water outlet of the mixing valve 931 It is connected to the water outlet nozzle 932 by the mixing hot water pipe 927. When the mixing valve 931 is a mixing valve for cold water and hot water, the first connecting water pipe 925 is connected to the hot water inlet of the mixing valve 931 , and the second connecting water pipe 926 is connected to the cold water inlet of the mixing valve 931 . The outlet hot water flow Q1 of the first hot water outlet 904 and the total inlet cold water flow Q2 of the cold water inlet 906 are changed by adjusting the mixing valve 931 .

The structural block diagram of the flow sensor installation embodiment 2 is shown in Figure 3. The difference from the embodiment 1 is that the first regulating valve 933 and the second regulating valve 934 are used instead of the water mixing valve 931; the water inlet of the first regulating valve 933 It is connected to the first hot water outlet 904 of the gas water heater through the first connecting water pipe 925 , and the water inlet of the second regulating valve 934 is connected to the second hot water outlet 905 of the gas water heater through the second connecting water pipe 926 . The water outlets of the first regulating valve 933 and the second regulating valve 934 are connected to one water outlet and connected to the mixed hot water pipe 927 . The outlet hot water flows of the first hot water outlet 904 and the second hot water outlet 905 are changed by adjusting the first regulating valve 933 and the second regulating valve 934 respectively; the first hot water outlet 904 and the second hot water outlet The sum of the outlet hot water flows of the water outlets 905 is equal to the total inlet cold water flow Q2 of the cold water inlets 906 .

An embodiment of the first flow measurement unit 100 is shown in FIG. 4 , which is provided with a first flow voltage output terminal. The first flow sensor 902 is a low-cost Hall water flow sensor, and the output of the sensor is a pulse frequency proportional to the flow. The first flow measurement unit 100 is composed of a first flow sensor 902 and a frequency-voltage conversion circuit. In the embodiment shown in Figure 4, the frequency-voltage conversion circuit is composed of a monolithic integrated frequency/voltage converter 101 and its peripheral components resistor 102, resistor 104, resistor 106, capacitor 103, and capacitor 105. The monolithic integrated frequency/voltage converter The model of 101 is LM2917, and the pin 10 of LM2917 is the first flow voltage output terminal, which outputs the first flow voltage U1. The frequency-to-voltage conversion circuit can also use other circuits capable of realizing the frequency/voltage conversion function.

The second flow measurement unit 200 is composed of a second flow sensor 903 and a frequency-voltage conversion circuit. The second flow sensor 903 is a low-cost Hall water flow sensor. The principle and structure of the frequency-voltage conversion circuit are the same as those of the first flow measurement unit 100. The frequency-to-voltage conversion circuit in is exactly the same, with a total flow voltage output terminal, which outputs the total flow voltage U2.

The first flow measurement unit 100 and the second flow measurement unit 200 can also adopt other measurement schemes, for example, use integrated flow transmitters to measure Q1 and Q2 respectively, and the integrated flow transmitters directly output U1 and U2.

The first flow measurement unit 100 detects Q1 and outputs U1, and the relationship between U1 and Q1 is proportional

U1=KQ·Q1;

The second flow measurement unit 200 detects Q2 and outputs U2, and the relationship between U2 and Q2 is proportional

U2=KQ·Q2;

KQ in the above two expressions is the flow measurement coefficient. The flow measurement coefficients of the first flow measurement unit 100 and the second flow measurement unit 200 are the same.

The cold water temperature measurement unit 300 is provided with a sensitivity control voltage output terminal, after measuring the inlet and outlet cold water temperature T, it is converted into a sensitivity control voltage U3 for output. Suppose the lowest value of the inlet cold water temperature is TL, and the highest value is TH, and the inlet cold water temperature T changes in the interval [TL, TH]. The function of the cold water temperature measuring unit 300 is: when the inlet cold water temperature T is equal to the lowest value TL, the sensitivity control voltage U3 is equal to the maximum value U3max; when the inlet cold water temperature T is equal to the highest value TH, the sensitivity control voltage U3 is equal to the minimum value U3min; When T changes in the interval [TL, TH], the sensitivity control voltage U3 decreases as the inlet cold water temperature T increases.

The embodiment of the cold water temperature measurement unit 300 is shown in FIG. 5, which is composed of a cold water temperature sensor 907, an operational amplifier 301, a resistor 302, a resistor 303, and a resistor 304. The cold water temperature sensor 907 is an NTC thermistor. The operational amplifier 301, the resistor 302, the resistor 303, and the resistor 304 form a temperature/voltage conversion circuit.

Assume that in the embodiment shown in Figure 5, the resistance value of the cold water temperature sensor 907 is RT, and the resistance values of the resistor 302, resistor 303, and resistor 304 are respectively R2, R3, and R4, then there are

one of them

is a fixed value.

In the embodiment shown in Fig. 5, when the inlet cold water temperature T drops, RT increases, and the sensitivity control voltage U3 increases; when the inlet cold water temperature T rises, RT decreases, and the sensitivity control voltage U3 decreases.

The proportional value calculation unit 400 is provided with a first numerator voltage input terminal, a second numerator voltage input terminal, a denominator voltage input terminal and a proportional value control voltage output terminal. The first numerator voltage input end is connected to the first flow voltage output end, and the first flow voltage U1 is input; the denominator voltage input end is connected to the total flow voltage output end, and the total flow voltage U2 is input; the second numerator voltage The input end is connected to the sensitivity control voltage output end, and the sensitivity control voltage U3 is input. The output of the proportional value calculation unit 400 is a proportional value control voltage UK, and its embodiment is shown in FIG. Capacitor 414 is formed.

The model of parallel A/D converter 401 is 8-bit parallel A/D converter ADC0841. 555 time base device 411, resistor 412, resistor 413, and capacitor 414 form an oscillator, and the periodic pulse output by the oscillator is connected to the parallel A/D The start conversion input terminal WR of the converter 401 starts an A/D conversion with each pulse, so that the parallel A/D converter 401 works in an automatic continuous conversion mode.

The analog voltage input negative terminal VIN-, output enable terminal RD, chip select terminal CS, digital ground DGND, and analog ground AGND of ADC0841 are connected to the common ground, and the power supply terminal VCC of ADC0841 is connected to the positive power supply +VDD. When the output enabling terminal RD of ADC0841 inputs a low level, its data output terminals DB7-DB0 maintain output valid. After each conversion of ADC0841, the result is automatically output from the data output terminals DB7~DB0.

U1 is connected to the analog voltage input terminal VIN+ of the ADC0841, and U2 is connected to the reference voltage input terminal VREF of the ADC0841. Suppose the 8-bit digital signal output by the ADC0841 output terminals DB7-DB0 is X, and its maximum value is 255. then there is

That is, the ratio between the two input voltages U1 and U2 is

The model of the parallel D/A converter 402 is an 8-bit parallel D/A converter AD5330. The parallel data input terminals of AD5330 are DB7- DB0, the reference voltage input terminal is VREF, and the conversion voltage output terminal is VOUT.

The buffer switch control terminal BUF of AD5330, the output ratio control terminal GAIN, the input register control terminal WR, the DAC register control terminal LDAC, the chip select terminal CS, and the ground terminal GND are connected to the common ground, and the clearing terminal CLR of AD5330, low power consumption The control terminal PD and the power supply terminal VDD are connected to the positive power supply +VDD. When the input register control terminal WR of AD5330 and the DAC register control terminal LDAC input low level, it is in the direct D/A conversion state. When the conversion delay is not considered, the conversion voltage output terminal VOUT reflects the data conversion results of the parallel data input terminals DB7~DB0 in real time. .

The parallel data input terminals DB7-DB0 of AD5330 are connected to the parallel data output terminals DB7-DB0 of ADC0841, the input data is X, and its maximum value is 255. The voltage input to the AD5330 reference voltage input terminal VREF is the sensitivity control voltage U3, and the voltage output from the conversion voltage output terminal VOUT is UK, then there is

Considering the input-output relationship of AD0841, the proportional value calculation unit 400 is according to the formula

The proportional value control voltage UK is calculated according to the ratio between the first flow voltage U1 and the total flow voltage U2 and the sensitivity control voltage U3. U3 is the maximum value of the proportional value control voltage UK, and its size adjusts the sensitivity of the proportional value control voltage UK. When the inlet cold water temperature T drops, the sensitivity control voltage U3 increases, the sensitivity of adjusting the proportional value control voltage UK increases, and the maximum value of the proportional value control voltage UK increases; when the inlet cold water temperature T rises, the sensitivity control voltage U3 decreases, The sensitivity of adjusting the proportional value control voltage UK decreases, and the maximum value of the proportional value control voltage UK decreases. When the inlet cold water temperature T changes from the highest value TH to the lowest value TL, the sensitivity control voltage U3 changes from the minimum value U3min to the maximum value U3max. The cold water temperature only plays a compensation role in the adjustment process, so the minimum value U3min of the sensitivity control voltage U3 is selected as 0.4 to 1 times the maximum value U3max. When U3min is equal to U3max, the device has no sensitivity cold water temperature compensation function.

The minimum value U3min and the maximum value U3max of the sensitivity control voltage U3 are realized by adjusting the component parameters in the cold water temperature measurement unit 300 .

The cold water temperature measuring unit 300 can also use circuits other than the embodiment shown in FIG. 5 . For example, the cold water temperature sensor 907 can use a PTC thermistor, in this case, the positions of the cold water temperature sensor 907 and the resistor 302 in the embodiment shown in FIG. 5 can be exchanged. In order to adjust the minimum value U3min and the maximum value U3max of the sensitivity control voltage U3 more flexibly and conveniently, a resistor can be connected in parallel to the cold water temperature sensor 907 in the embodiment shown in FIG. 5 . In addition, when an NTC thermistor or a PTC thermistor is used as the cold water temperature sensor 907, a resistance bridge can also be used to measure the change of the resistance value of the cold water temperature sensor 907 caused by the temperature change.

The embodiment shown in FIG. 6 is suitable for occasions where the calculation speed of the proportional value is not high and the change of the input voltage is relatively gentle. Because what U1, U2 reflect in the utility model is the water heater flow rate, and changes gently, so applicable. The proportional value calculation unit 400 can also adopt other analog dividers and analog multiplier circuits, for example, use the analog divider and analog multiplier circuits formed by integrated analog multipliers/dividers such as AD734 and AD534 to calculate according to U1, U2 and U3 get UK.

The flow threshold switch unit 500 inputs the total flow voltage U2, and outputs a switch signal related to the flow threshold QY. The embodiment of the flow threshold switch unit 500 is shown in Figure 7, which is composed of a comparator 501, a resistor 502, a resistor 503, a resistor 504, a triode 505, a freewheeling diode 506, a relay coil 507, and a relay gas switch 508, and is related to the flow threshold QY The switch signal is the closing and opening of the relay gas switch 508.

In the embodiment shown in Fig. 7, the voltage divider circuit that resistance 502, resistance 503 forms is flow threshold value QY setting circuit, is provided with flow threshold value voltage output terminal, the flow threshold value voltage UY of output setting; Change resistance 502, resistance 503 The partial pressure ratio can change the set flow threshold QY. The relationship between the flow threshold voltage UY and the flow threshold QY is

Comparator 501 , resistor 504 , triode 505 , freewheeling diode 506 and relay coil 507 form a comparison driving circuit of relay gas switch 508 .

When the total inlet cold water flow Q2 is greater than the flow threshold QY, the total flow voltage U2 is greater than the flow threshold voltage UY, the comparator 501 outputs a high level, the triode 505 is turned on, the relay coil 507 is energized, and the relay gas switch 508 is closed; when the inlet cold water When the total flow Q2 is less than the flow threshold QY, the relay gas switch 508 is turned off.

The proportional valve driving unit 600 is composed of a gas proportional regulating valve and a proportional valve driving circuit. The input end of the proportional valve driving circuit is connected to the proportional value control voltage output end, and the opening of the gas proportional regulating valve is driven by the proportional valve driving circuit.

The embodiment of the proportional valve driving circuit is shown in FIG. 8 , which consists of a power operational amplifier 601 , a resistor 602 , a resistor 603 and a freewheeling diode 604 . The freewheeling diode 604 is connected in parallel with the proportional coil 630 . Its working principle is: by changing the opening degree of the gas proportional regulating valve, the flow of gas can be changed, thereby changing the combustion power of the gas water heater and changing the temperature of hot water. Specifically: when the proportional value control voltage UK increases, the output voltage UB of the proportional valve driving circuit increases, the current on the proportional coil 630 increases, the opening of the gas proportional regulating valve increases, the combustion power of the gas water heater increases, and the heating The water temperature rises; when the proportional value control voltage UK decreases, the output voltage UB of the proportional valve drive circuit decreases, the current on the proportional coil 630 decreases, the opening of the gas proportional regulating valve decreases, the combustion power of the gas water heater decreases, and the heating The water temperature drops.

Resistors 602 and 603 are used to adjust the range of the output voltage UB of the proportional valve drive circuit. When the proportional value control voltage UK is equal to its maximum control voltage UM, the maximum control current, that is, the rated current, flows through the proportional coil 630 to make the gas proportional control valve The opening reaches its maximum value.

The proportional valve drive circuit can use other types of drive circuits, for example, triode power drive circuits, voltage/PWM conversion and PWM drive circuits, and so on. The function of the proportional valve driving circuit is: when the proportional value control voltage UK increases, the current on the control proportional coil 630 increases; when the proportional value control voltage UK decreases, the current on the control proportional coil 630 decreases; when the proportional value control voltage UK When UK is the maximum value UM, the current on the control proportional coil 630 is the rated current.

The block diagram of the conventional control system of the gas water heater is shown in Figure 9, which consists of a controller 10, a water control switch 11, an ignition discharge needle 12, a flame sensor needle 13, an exhaust fan 14, and a solenoid valve 15. Its working principle is: after the water heater is turned on, the water control switch 11 is turned on, the controller 10 controls the exhaust fan 14 to be energized to work, and at the same time controls the ignition and discharge needle 12 to discharge and ignite; a little delay controls the solenoid valve 15 to pull in and turn on the gas; The ignition and discharge needle 12 maintains the ignition for tens of seconds to ensure the reliability of the ignition; after the discharge is over, the flame sensor needle 13 is used to determine whether the ignition is successful, and the controller 10 senses the ignition success through the flame sensor needle 13, then controls and maintains the solenoid valve 15 pulls in and turns on the gas; sensing that the ignition is unsuccessful, the solenoid valve 15 is controlled to pop up, the gas is turned off, and the water heater stops heating.

In order to ensure the safe use of the gas water heater, the gas water heater may also include a wind pressure switch 16 and a temperature control switch 17 as shown in FIG. 9 . During the use of the water heater, if the wind pressure switch 16 detects that the exhaust fan is not activated, or the temperature control switch 17 detects that the fire is too high and the outlet water temperature is too high, or the water control switch 11 detects that the water flow is too small, the solenoid valve 15 will be activated. Bounce up, turn off the gas, and avoid safety accidents.

When the gas water heater uses the device of the present invention, its control system is composed of the device and the controller 10 of the system shown in Figure 9, the ignition discharge needle 12, the flame induction needle 13, the exhaust fan 14, and the solenoid valve 15, or it can also be selected Features include air pressure switch 16, temperature control switch 17. The water control switch 11 in the conventional control system of the gas water heater shown in Figure 9 is replaced by the relay gas switch 508 in the device of the present invention, and the gas proportional regulating valve in the device of the present invention is installed after the solenoid valve 15 in the gas pipeline. Since the conventional gas proportional valve assembly usually includes a gas proportional regulating valve and a safety cut-off valve, therefore, the solenoid valve 15 in the conventional control system of the gas water heater shown in Figure 9 preferably uses the safety cut-off valve in the gas proportional valve assembly, The gas proportional regulating valve uses the gas proportional regulating valve in the gas proportional valve assembly.

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

When the gas water heater uses the device of the present invention, the control circuit in the device of the present invention can be combined with the controller 10 to form a new temperature adjustment controller. As shown in Figure 10 is a block diagram of a gas water heater control system with a remote temperature adjustment function, which consists of a temperature adjustment controller 20, an ignition discharge needle 12, a flame sensor needle 13, an exhaust fan 14, a solenoid valve 15, a gas proportional adjustment valve 21, a first The flow sensor 902 , the second flow sensor 903 , and the cold water temperature sensor 907 are composed, or alternatively include a wind pressure switch 16 and a temperature control switch 17 . The temperature regulation controller 20 is made up of the functional circuit in the controller 10 and the control circuit in the device of the present invention, the control circuit in the device of the present invention includes a first flow measurement unit 100, a second flow measurement unit 200 , the corresponding circuits in the cold water temperature measurement unit 300 , the proportional value calculation unit 400 , the flow threshold switch unit 500 and the proportional valve drive unit 600 . Similarly, the solenoid valve 15 in FIG. 10 is preferably a safety cut-off valve in the gas proportional valve assembly, and the gas proportional regulating valve 21 is a gas proportional regulating valve in the gas proportional valve assembly.

The above description is only an embodiment of the present invention, and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and changes. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the scope of the claims of the present invention.

Claims (10)

1. A remote adjustment device for combustion power of a gas water heater with sensitivity cold water temperature compensation, characterized in that: It is composed of a first flow measurement unit, a second flow measurement unit, a cold water temperature measurement unit, a proportional value calculation unit, a flow threshold switch unit and a proportional valve drive unit; The gas water heater has a cold water inlet, a first hot water outlet, and a second hot water outlet; a first flow sensor is installed before the first hot water outlet to detect the outlet of the first hot water outlet hot water flow; a second flow sensor and a cold water temperature sensor are installed behind the cold water inlet, which are respectively used to detect the total flow of cold water at the inlet of the cold water and the temperature of the inlet cold water; The first flow measurement unit converts the outlet hot water flow of the first hot water outlet detected by the first flow sensor into a first flow voltage output; the second flow measurement unit converts the cold water flow detected by the second flow sensor The total flow of cold water at the water inlet is converted into a total flow voltage output; after the cold water temperature measuring unit measures the temperature of the cold water at the inlet and outlet, it is converted into a sensitivity control voltage output; The proportional value calculation unit calculates and outputs the proportional value control voltage according to the ratio between the first flow voltage and the total flow voltage, and the sensitivity control voltage; The flow threshold switch unit is composed of a flow threshold setting circuit, a comparison drive circuit, and a relay gas switch; the flow threshold setting circuit outputs a flow threshold voltage, and the flow threshold is determined by the flow threshold voltage; the function of the flow threshold switch unit is: When the total flow voltage is greater than the flow threshold voltage, the total flow of the inlet cold water is greater than the flow threshold, and the relay gas switch is closed; when the total flow voltage is lower than the flow threshold voltage, the total flow of the inlet cold water is less than the flow threshold, and the relay gas switch is turned off; The proportional valve driving unit is composed of a gas proportional regulating valve and a proportional valve driving circuit; the function of the proportional valve driving circuit is: when the proportional value control voltage increases, the proportional valve driving circuit controls the opening of the gas proportional regulating valve to increase. Larger, the combustion power of the gas water heater increases; when the proportional value control voltage decreases, the proportional valve driving circuit controls the opening of the gas proportional regulating valve to decrease, and the combustion power of the gas water heater decreases; The cold water flowing in from the cold water inlet is heated and flows out from the first hot water outlet and the second hot water outlet; the total flow of cold water at the cold water inlet is equal to the first hot water outlet and the second hot water outlet The sum of the outlet hot water flow. 2. The remote adjustment device for combustion power of a gas water heater with sensitivity cold water temperature compensation according to claim 1, characterized in that: the first flow voltage and the outlet hot water flow of the first hot water outlet are in a proportional relationship ; There is a proportional relationship between the total flow voltage and the total flow of cold water at the cold water inlet; the proportional relationship between the flow threshold voltage and the flow threshold. 3. The combustion power remote adjustment device for gas water heaters with sensitivity cold water temperature compensation as claimed in claim 2, characterized in that: the ratio between the total flow voltage and the total flow of cold water at the cold water inlet is equal to the first flow The proportional value between the voltage and the outlet hot water flow of the first hot water outlet; the ratio between the flow threshold voltage and the flow threshold is equal to the ratio between the first flow voltage and the outlet hot water flow of the first hot water outlet ratio between. 4. The combustion power remote adjustment device for gas water heater with sensitivity cold water temperature compensation as claimed in claim 1, characterized in that: the function of the cold water temperature measuring unit is: when the inlet cold water temperature is the lowest value, the sensitivity control voltage is equal to the maximum value; when the inlet cold water temperature is the highest value, the sensitivity control voltage is equal to the minimum value; when the inlet cold water temperature changes between its lowest value and the highest value, the sensitivity control voltage decreases with the increase of the inlet cold water temperature. 5. The combustion power remote adjustment device for gas water heater with sensitivity cold water temperature compensation as claimed in claim 4, characterized in that: said proportional value calculation unit calculates the ratio between the first flow voltage and the total flow voltage, and the sensitivity The control voltage calculates and outputs a proportional value control voltage; the proportional value control voltage is directly proportional to the ratio; the proportional value control voltage is directly proportional to the sensitivity control voltage. 6. The combustion power remote adjustment device of gas water heater with sensitivity cold water temperature compensation as claimed in claim 1, characterized in that: the outlet hot water flow of the first hot water outlet and the second hot water outlet is controlled by the mixed water The valve adjustment is changed; the two water inlets of the water mixing valve are respectively connected to the first hot water outlet and the second hot water outlet of the gas water heater by water pipes. 7. The combustion power remote adjustment device for gas water heaters with sensitivity cold water temperature compensation according to claim 1, characterized in that: the outlet hot water flows of the first hot water outlet and the second hot water outlet are determined by the first hot water outlet respectively. A regulating valve and a second regulating valve are adjusted and changed; the water inlet of the first regulating valve is connected to the first hot water outlet of the gas water heater through a water pipe, and the water inlet of the second regulating valve is connected to the second hot water outlet of the gas water heater through a water pipe. Hot water outlet; the water outlets of the first regulating valve and the second regulating valve are connected to form a water outlet. 8. The combustion power remote adjustment device for gas water heater with sensitivity cold water temperature compensation as claimed in claim 1, characterized in that: the control system of the gas water heater consists of the device, controller, ignition discharge needle, flame sensor needle, Composed of an exhaust fan and a solenoid valve; the gas proportional regulating valve in the device is installed behind the solenoid valve in the gas pipeline. 9. The combustion power remote adjustment device for gas water heater with sensitivity cold water temperature compensation as claimed in claim 1, characterized in that: the control system of the gas water heater consists of a temperature adjustment controller, an ignition discharge needle, a flame sensor needle, an exhaust fan, It consists of a solenoid valve, a gas proportional regulating valve, a first flow sensor, a second flow sensor, and a cold water temperature sensor; the control circuit in the device is included in the temperature controller; the control circuit in the device includes the first flow rate Corresponding circuits in the measurement unit, the second flow measurement unit, the cold water temperature measurement unit, the proportional value calculation unit, the flow threshold switch unit and the proportional valve drive unit. 10. The combustion power remote adjustment device for gas water heater with sensitivity cold water temperature compensation as claimed in claim 8 or claim 9, characterized in that: the solenoid valve uses a safety cut-off valve in the gas proportional valve assembly; the gas The proportional regulating valve uses the gas proportional regulating valve in the gas proportional valve assembly.