TWM496116U - Thermostat of gas water heater - Google Patents

Description

Gas water heater thermostat

This creation is about a gas water heater thermostat, especially when the water is adjusted during use, the fire power will not change, and the gas supply rate can be automatically adjusted when the water (or ambient) temperature changes and the water temperature exceeds the temperature. The control device that maintains the outlet water temperature at the water temperature of the user's original set fire power and the highest water temperature that is not higher than the preset air supply amount.

There is only one main control reference for thermostatic water heaters: control of firepower (supply). Its working principle, in simple terms, is to calculate a "normal state" by continuously monitoring the condition value, so that the control factors are kept at a constant position and the result as much as possible. That is to say, when the hot water is turned off, it will keep the set values in the original state (because most of the time, the water temperature required for the next re-opening is the same as the last time); When turning on the hot water, refer to the normal state in the monitoring record for fine adjustment, so that the water temperature can be quickly pulled back to the previous level (the general target is to control the positive and negative 3 degrees error of the user set temperature), because this error range is still In an acceptable range, the user will not be eager to avoid hot water under the shower head. But this also has a problem, that is, cold water can not be added; because if the intention is to adjust the water output by increasing the cold water during use, it will affect the control result of the constant temperature water heater. That is to say, when the water volume is increased, it will not be able to heat up to the water temperature set by the user in a short time; when the water volume is adjusted, the water temperature is difficult to instantaneously drop to the originally set temperature. In other words, users who use traditional thermostat water heaters will lose control of adjusting the amount of water and cannot really control it with "water volume". Water temperature. In addition, the amount of water is targeted at the maximum output, because the control of the amount of water is always on the user.

Although the higher-order thermostatic water heater can calculate the cold water input water and the water inlet temperature to change the gas volume to meet the set target, and then compare and verify with the temperature detector at the water outlet, and finally compensate and adjust the error, and finally obtain the The expected stable water volume and water temperature, but the high-order water heaters with such control functions are expensive due to their relatively complicated structure.

This creation is to solve the above problems, and its purpose is to provide a gas water heater thermostat device, which can keep the firepower constant when the water volume is adjusted during use, and avoid the water temperature being hot and cold.

The second purpose of the present invention is to provide a gas water heater thermostat device, which can automatically adjust the gas supply amount when the water inlet temperature or the ambient temperature changes, and maintain the outlet water temperature at the original set fire power temperature, without requiring the user to reset.

Another object of the present invention is to provide a gas water heater thermostat device, which can automatically reduce the gas supply amount when the water outlet temperature is overheated due to the small or abnormal water intake, so that the outlet water temperature drops to the highest water lower than the preset gas supply amount. temperature.

The gas water heater thermostat device specifically implementing the present invention comprises an operation interface having at least one button for setting a firepower of two or more segments; a microprocessor receiving a signal input when the button is operated, and processing the signal Outputting a display signal after the signal, and outputting a control signal when the water heater is activated; a display circuit including a display driven by the display signal to display the number of firepower segments set by the button; and a differential pressure valve assembly Control circuit, according to the control given by the microprocessor a signal that causes a differential pressure valve assembly having a primary and secondary valve plug to operate with a pressure differential principle to vary the gas supply amount to meet the set fire target, so that when the water output is adjusted during use, the fire power does not follow Change, and can completely avoid the water temperature suddenly hot and cold.

In another embodiment, the gas water heater thermostat further includes a temperature detecting circuit for adding a signal detected by the water inlet temperature or the ambient temperature detector to the microprocessor operation, and the user After the set gas supply amount is compared, a compensation signal is outputted to the differential pressure valve assembly control circuit, so that the differential pressure valve assembly automatically adjusts the gas supply amount, and maintains the outlet water temperature at the water temperature of the original set air supply amount.

In another embodiment, the temperature detecting circuit is further connected to an outlet water temperature detector to add a signal detected by the water outlet temperature detector to the microprocessor, and calculate an actual water temperature through the microprocessor. And the preset maximum water temperature difference in gas supply, when the outlet water temperature exceeds the preset water temperature, output a decrement signal to the differential pressure valve assembly control circuit, so that the differential pressure valve assembly automatically reduces the gas supply amount to below The preset air supply amount prevents the outlet water temperature from overheating.

In another embodiment, the at least one button includes a temperature increase button and a temperature drop button; the display is carried by the operation interface.

The advantage of this creation compared to the conventional technology is that it can supply the gas supply amount that meets the set fire target, and keep the outlet water temperature at a constant temperature, so that even if the water output is adjusted during use, the firepower does not change, so The water temperature is completely avoided, and the structure is simple, which can effectively reduce the production cost.

In addition, the gas supply amount can be automatically adjusted when the water inlet (or ambient) temperature changes and the outlet water temperature is overheated, so that the outlet water temperature is maintained at the water temperature set by the original user and the highest water temperature lower than the preset gas supply amount of the microprocessor.

For the detailed technical content of this creation and other purposes and characteristics The following description of the embodiments in conjunction with the drawings will be fully understood.

10‧‧‧Gas water heater thermostat

12‧‧‧Operation interface

14‧‧‧Microprocessor

16‧‧‧Display circuit

18‧‧‧ differential pressure valve assembly control circuit

20‧‧‧Power circuit

22‧‧‧ Temperature detection circuit

Figure 1 is a detailed circuit diagram of a preferred embodiment of a gas heater thermostat.

The first figure shows the detailed circuit of the gas water heater thermostat 10 of the present invention, which can explain the technical content of the creation. The thermostat device 10 includes an operation interface 12, a microprocessor 14, a display circuit 16 and a differential pressure valve assembly control circuit 18, and is configured according to a certain line logic to achieve a function of controlling the water temperature of the water heater. The operation interface 12 is electrically connected to the microprocessor 14 and disposed on the front cover of the water heater, and provides a temperature rising button PB1 and a cooling button PB2 for respectively adjusting the firepower upwards and downwards to adjust the gas intake. The amount is obtained to obtain hot water of suitable temperature. Of course, a circular button can also be used for the user to set the firepower of two or more stages.

The microprocessor 14 is supplied with an operating voltage by the power supply circuit 20 to receive a signal input when the temperature rising key PB1 and the cooling temperature key PB2 are operated, and is outputted by a program stored in advance in its memory, and outputs a display signal, and the water heater is When activated, a control signal is output to cause the display circuit 16 and the differential pressure valve assembly control circuit 18 to operate, respectively.

The display circuit 16 is composed of the display LED1 and its peripheral electronic components to receive the display signal input by the microprocessor 14, and displays the number of firepower segments set by the user on the display LED1 for confirmation. In the embodiment of the figures, the display The seven-segment LED is used to display the number of firepower segments. The larger the number, the stronger the firepower. However, a liquid crystal display (LCD) can also be used, which is not limited by the LED display. Display LED 1 is also carried by operation interface 12.

The differential pressure valve assembly control circuit 18, according to the control signal given by the microprocessor 14, causes a differential pressure valve assembly (not shown) having a main and auxiliary valve plug to operate by using the pressure difference principle to change the gas supply amount. In order to meet the set firepower goals. The differential pressure valve assembly control circuit 18 is mainly composed of transistors Q2~Q10 and resistors R16~R23, R25, wherein the Q5 controlled contact TP7 is connected to the normally closed solenoid valve of the differential pressure valve assembly, and the Q7 controlled contact TP9 A normally open solenoid valve that is connected to the differential pressure valve assembly. The differential pressure valve assembly can adopt the differential pressure disc disclosed in Figures 1 to 7 of the "Gas Differential Pressure Control Assembly" of the National New Patent No. 240901. Since the differential pressure valve assembly (pressure differential disc) is a conventional technique, further explanation is not necessary.

Then explain how this creation works. 1. Setting the firepower (water temperature): When the user presses the heating button PB1 or the cooling button PB2 to set the firepower, an electrical signal is output to the microprocessor 14, and the microprocessor 14 processes the signal given by the button. , a display signal is output to the display LED1 to display the set number of firepower segments. 2. Turning on the hot water: When the water heater is started due to the hot water tap being turned on, the microprocessor 14 outputs a control signal to the differential pressure valve assembly control circuit 18 according to the firepower set by the user, so that the differential pressure valve assembly is actuated. And maintain the proper opening degree to supply the gas supply amount that meets the set fire target, and keep the outlet water temperature at a constant temperature, so that even if the water quantity is adjusted during use, the firepower will not change, so the water temperature can be completely avoided. Cold and hot, it is really to achieve a constant temperature effect.

In a preferred embodiment, as shown in FIG. 1, the present invention further includes a temperature detecting circuit 22 for connecting a water inlet (cold) to its contact TP5. Water) temperature or ambient temperature detector (not shown), the temperature detector converts the detected water inlet temperature or ambient temperature into electrical quantities such as voltage, resistance, etc., and then applies this signal to the microprocessor 14 for calculation, and After comparing with the air supply amount set by the user at the last use, a compensation signal is outputted to the differential pressure valve assembly control circuit 18, so that the differential pressure valve assembly automatically adjusts the gas supply amount, that is, when the water inlet temperature or the ambient temperature decreases, the pressure is decreased. The differential valve assembly increases the amount of gas supplied; when the inlet water temperature or ambient temperature increases, the gas supply is reduced. Therefore, when the ambient temperature of the inlet water temperature changes, the outlet water temperature can still maintain the water temperature of the original set fire power, and the user is required to reset the firepower, which is simple and practical.

In addition, the temperature detecting circuit 22 can further connect a water (hot water) temperature detector (not shown) through its contact TP10, and the water temperature detector adds the detected water temperature signal to the microprocessor. 14. Calculating the difference between the actual water outlet temperature and the preset maximum water temperature by the microprocessor 14 when the outlet water temperature exceeds the maximum water temperature of the preset gas supply amount due to the fact that the water temperature is constant but the water intake amount is small or the water heater is abnormal. The microprocessor 14 outputs a decrement signal to the differential pressure valve assembly control circuit 18, so that the differential pressure valve assembly automatically reduces the gas supply amount to a lower than the preset air supply amount, preventing the water temperature from overheating and ensuring safety. Once the outlet water temperature drops to the preset water temperature, the differential pressure valve assembly automatically returns to the original user's set air supply.

Of course, the above embodiments may be modified without departing from the scope of the present invention, and all the matters included in the above description and the drawings should be regarded as illustrative, and not intended to limit the scope of patent application of the present invention. .

10‧‧‧Gas water heater thermostat

12‧‧‧Operation interface

14‧‧‧Microprocessor

16‧‧‧Display circuit

18‧‧‧ differential pressure valve assembly control circuit

20‧‧‧Power circuit

22‧‧‧ Temperature detection circuit

Claims (4)

A gas water heater thermostat device comprises: an operation interface having at least one button for setting a firepower of two or more (inclusive); a microprocessor receiving a signal input when the button is operated, and processing the signal and outputting a display signal, and when the water heater is activated, outputting a control signal; a display circuit including a display driven by the display signal to display the number of firepower segments set by the button; and a differential pressure valve assembly control circuit, According to the control signal given by the microprocessor, a differential pressure valve assembly having a main and auxiliary valve plug operating by using the pressure difference principle changes the gas supply amount to meet the set fire target, thereby adjusting out in use. When the amount of water is used, the firepower will not change, and the water temperature will be completely avoided. The gas water heater thermostat device of claim 1, further comprising a temperature detecting circuit for adding a signal detected by the water inlet temperature or the ambient temperature detector to the microprocessor operation, and the user After the set gas supply amount is compared, a compensation signal is outputted to the differential pressure valve assembly control circuit, so that the differential pressure valve assembly automatically adjusts the gas supply amount, and maintains the outlet water temperature at the water temperature of the original set air supply amount. The gas water heater thermostat according to claim 2, wherein the temperature detecting circuit is further connected to an outlet water temperature detector to add a signal detected by the outlet water temperature detector to the microprocessor, and the micro processing is performed. Calculate the difference between the actual outlet water temperature and the preset maximum water temperature, when the outlet water temperature exceeds the preset water temperature And outputting a decrement signal to the differential pressure valve assembly control circuit, so that the differential pressure valve assembly automatically reduces the gas supply amount to be lower than the preset gas supply amount, and prevents the outlet water temperature from overheating. The gas water heater thermostat of claim 1, wherein the at least one button comprises a temperature rising button and a temperature reducing button; the display is carried by the operating interface.