CN109855284B - Household gas water heater and control method thereof - Google Patents
Household gas water heater and control method thereof Download PDFInfo
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- CN109855284B CN109855284B CN201711232500.8A CN201711232500A CN109855284B CN 109855284 B CN109855284 B CN 109855284B CN 201711232500 A CN201711232500 A CN 201711232500A CN 109855284 B CN109855284 B CN 109855284B
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Abstract
The invention relates to a household gas water heater and a control method thereof, wherein the household gas water heater comprises a box body, a burner, a heat exchanger, a heating pipe, a circulating pump and a control panel, wherein the burner, the heat exchanger, the heating pipe, the circulating pump and the control panel are arranged in the box body, the heating pipe is arranged in the heat exchanger, two ends of the heating pipe are respectively connected with a water inlet pipe and a water outlet pipe, the circulating pump is arranged on the water inlet pipe or the water outlet pipe, the water inlet pipe is also provided with a water flow sensor: the circulating pump is a direct-current circulating pump, a rotating speed feedback pin of the direct-current circulating pump is electrically connected with the control panel, and a signal ground pin of the direct-current circulating pump is electrically connected with the control panel so as to collect the working current of the direct-current circulating pump; and a power supply pin of the direct current circulating pump is electrically connected with the control panel. The invention can utilize the control pin of the direct current circulating pump to control the direct current circulating pump.
Description
Technical Field
The invention relates to a household gas water heater and a control method thereof.
Background
Because the delivery port is far away from gas heater at the actual user's family, lead to the user to use hot water and need wait for a long time, consequently the water heater adopts the mode of built-in and external water pump, preheats the cold water in the pipeline earlier to obtain better user experience. At present, most of water pumps adopt alternating-current water pumps, and have the advantages of simple control and large volume and lack of sufficient detection means.
Disclosure of Invention
The invention aims to solve the primary technical problem of providing a household gas water heater with small volume and convenient detection aiming at the prior art.
The present invention further aims to solve the technical problem of providing a control method for a household gas water heater with small volume for easy detection in view of the above prior art.
The utility model provides a technical scheme that above-mentioned technical problem adopted does: the utility model provides a domestic gas water heater, includes the box, sets up combustor, heat exchanger, heating pipe, circulating pump and the control panel in the box, and the heating pipe setting is in heat exchanger, and the both ends of heating pipe are connected with inlet tube and outlet pipe respectively, and the circulating pump setting still is equipped with water flow sensor on inlet tube or outlet pipe, and water flow sensor, combustor and circulating pump all are connected its characterized in that with the control panel electricity: the circulating pump is a direct-current circulating pump, a rotating speed feedback pin of the direct-current circulating pump is electrically connected with the control panel, and a signal ground pin of the direct-current circulating pump is electrically connected with the control panel so as to collect the working current of the direct-current circulating pump; and a power supply pin of the direct current circulating pump is electrically connected with the control panel.
As an improvement, a signal ground pin of the direct current circulating pump is electrically connected with the control board after adopting a resistor.
The technical scheme adopted by the invention for solving the further technical problems is as follows: the control method of the household gas water heater with the structure is characterized by comprising the following steps
Step one, turning on a household gas water heater, wherein the household gas water heater is in a standby state;
step two, the control panel judges whether the user presses the circulation preheating function of the household gas water heater, if so, the control panel turns on the direct current circulating pump, outputs a PWM control signal with fixed frequency and fixed duty ratio to a power supply pin of the direct current circulating pump, and goes to step seven, if not, continues to stand by, and goes to step three;
step three, the control panel judges whether the water flow sensor detects water flow, if so, the step four is carried out;
step four, the control panel opens the burner, and then the step five is carried out;
step five, the control panel judges whether the water flow value detected by the water flow sensor is lower than a preset water flow threshold value, if so, the control panel turns on the direct current circulating pump, outputs a PWM control signal with fixed frequency and fixed duty ratio to a power supply pin of the direct current circulating pump, and goes to step seven; if not, the step six is carried out;
step six, the control panel judges whether the water pressure value fluctuates, if so, the control panel turns on the direct current circulating pump, outputs a PWM control signal with fixed frequency and fixed duty ratio to a power supply pin of the direct current circulating pump, and goes to step seven, if not, the control panel returns to step four;
step seven, the control panel judges whether the rotating speed of the direct current circulating pump is normal through a rotating speed feedback pin of the direct current circulating pump, if the rotating speed of the direct current circulating pump is normal, the step eight is carried out, if the rotating speed of the direct current circulating pump is not normal, a fault alarm signal of the direct current circulating pump is output, and the control panel does not output a control signal to a power supply pin of the direct current circulating pump any more;
step eight, the control panel acquires the working current of the direct current circulating pump through the signal of the signal ground pin of the direct current circulating pump, judges whether the working current of the direct current circulating pump is normal or not, if the working current of the direct current circulating pump is normal, the step nine is carried out, if the working current of the direct current circulating pump is not normal, a fault alarm signal of the direct current circulating pump is output, and the control panel does not output a control signal to the power supply pin of the direct current circulating pump any;
and step nine, the control board judges whether the water flow sensor detects water flow, if so, the control board turns on the direct current circulating pump, outputs a PWM control signal with fixed frequency and fixed duty ratio to a power supply pin of the direct current circulating pump, and goes to step seven, if not, outputs a fault alarm signal of the direct current circulating pump, and the control board does not output a control signal to the power supply pin of the direct current circulating pump any more.
Compared with the prior art, the invention has the advantages that: the circulating pump is arranged on a direct current circulating pump, and the direct current circulating pump is essentially a direct current motor and generally has four control pins: the control pin of the direct current circulating pump can be used for controlling the direct current circulating pump. In the control method, the control board outputs a PWM control signal with fixed frequency and fixed duty ratio to a power supply pin of the direct current circulating pump, and constant rotating speed feedback can be obtained by adjusting the amplitude of the power supply; meanwhile, the rotating speed and the working current of the direct current circulating pump are detected in real time, and whether the direct current circulating pump works normally is detected; meanwhile, the work of the direct current circulating pump is controlled according to the water flow and the water pressure of a user home, and the constant outlet water temperature of the water heater is effectively guaranteed.
Drawings
Fig. 1 is a schematic structural diagram of a household gas water heater in an embodiment of the invention.
Fig. 2 is a flow chart of a control method of a household gas water heater in the embodiment of the invention.
Detailed Description
The invention is described in further detail below with reference to the accompanying examples.
The household gas water heater shown in fig. 1 comprises a tank body 1, a burner 2, a heat exchanger 9, a heating pipe 3, a circulating pump 4 and a control board 5 which are arranged in the tank body 1, wherein the heating pipe 3 is arranged in the heat exchanger 9, two ends of the heating pipe 3 are respectively connected with a water inlet pipe 6 and a water outlet pipe 7, and the circulating pump 4 is arranged on the water inlet pipe 6 and can also be arranged on the water outlet pipe; still be equipped with water flow sensor 8 on the inlet tube, water flow sensor 8, combustor 2 and circulating pump 4 all are connected with control panel 5 electricity.
In the embodiment, the circulating pump 4 is a direct current circulating pump, a rotating speed feedback pin of the direct current circulating pump is electrically connected with the control panel, and a signal ground pin of the direct current circulating pump is electrically connected with the control panel after adopting a resistor so as to collect the working current of the direct current circulating pump; and a power supply pin of the direct current circulating pump is electrically connected with the control panel.
After the water heater is turned on, the direct-current circulating pump should start to operate, then water should start to flow, and the water flow sensor can detect the water flow; if the water flow is not detected, an alarm is required, and the power supply of the direct current circulating pump is turned off; once the direct-current circulating pump starts to operate, the rotating speed of the direct-current circulating pump needs to be acquired through a rotating speed feedback pin, if the rotating speed cannot be detected, an alarm needs to be given, and a power supply of the direct-current circulating pump is turned off; meanwhile, the working current of the direct current circulating pump needs to be detected, if the working current is abnormal, an alarm needs to be given, and a power supply of the direct current circulating pump is turned off, wherein the current abnormality comprises overlarge or undersize current during operation; when not in operation, current is generated. Therefore, the control method of the household gas water heater in the embodiment includes the following steps, referring to fig. 2
Step one, turning on a household gas water heater, wherein the household gas water heater is in a standby state;
step two, the control panel judges whether the user presses the circulation preheating function of the household gas water heater, if so, the control panel turns on the direct current circulating pump, outputs a PWM control signal with fixed frequency and fixed duty ratio to a power supply pin of the direct current circulating pump, and goes to step seven, if not, continues to stand by, and goes to step three;
step three, the control panel judges whether the water flow sensor detects water flow, if so, the step four is carried out;
step four, the control panel opens the burner, and then the step five is carried out;
step five, the control panel judges whether the water flow value detected by the water flow sensor is lower than a preset water flow threshold value, if so, the control panel turns on the direct current circulating pump, outputs a PWM control signal with fixed frequency and fixed duty ratio to a power supply pin of the direct current circulating pump, and goes to step seven; if not, the step six is carried out;
step six, judging whether the water pressure value fluctuates or not by the control board through whether the water flow value detected by the water flow sensor is large or small, if so, turning on the direct-current circulating pump by the control board, outputting a PWM control signal with fixed frequency and fixed duty ratio to a power supply pin of the direct-current circulating pump, and turning to step seven, otherwise, returning to the step four;
step seven, the control panel judges whether the rotating speed of the direct current circulating pump is normal through a rotating speed feedback pin of the direct current circulating pump, if the rotating speed of the direct current circulating pump is normal, the step eight is carried out, if the rotating speed of the direct current circulating pump is not normal, a fault alarm signal of the direct current circulating pump is output, and the control panel does not output a control signal to a power supply pin of the direct current circulating pump any more;
step eight, the control panel acquires the working current of the direct current circulating pump through the signal of the signal ground pin of the direct current circulating pump, judges whether the working current of the direct current circulating pump is normal or not, if the working current of the direct current circulating pump is normal, the step nine is carried out, if the working current of the direct current circulating pump is not normal, a fault alarm signal of the direct current circulating pump is output, and the control panel does not output a control signal to the power supply pin of the direct current circulating pump any;
and step nine, the control board judges whether the water flow sensor detects water flow, if so, the control board turns on the direct current circulating pump, outputs a PWM control signal with fixed frequency and fixed duty ratio to a power supply pin of the direct current circulating pump, and goes to step seven, if not, outputs a fault alarm signal of the direct current circulating pump, and the control board does not output a control signal to the power supply pin of the direct current circulating pump any more.
At home of an actual user, water flow is possibly small due to water pressure, and therefore the experience of the user is poor during bathing. Aiming at the situation, in the invention, if the water flow of the user home is lower than the water flow set threshold, the direct-current circulating pump is started, and the direct-current circulating pump is equivalent to a booster pump, so that the water yield of the user home can be increased; secondly, the water pressure of some users in the house is unstable, the water yield is small and large, so that the water heater cannot accurately control the temperature and oscillate back and forth.
Claims (2)
1. The utility model provides a domestic gas water heater, includes the box, sets up combustor, heat exchanger, heating pipe, circulating pump and the control panel in the box, and the heating pipe setting is in heat exchanger, and the both ends of heating pipe are connected with inlet tube and outlet pipe respectively, and the circulating pump setting still is equipped with water flow sensor on inlet tube or outlet pipe, and water flow sensor, combustor and circulating pump all are connected its characterized in that with the control panel electricity: the circulating pump is a direct-current circulating pump, a rotating speed feedback pin of the direct-current circulating pump is electrically connected with the control panel, and a signal ground pin of the direct-current circulating pump is electrically connected with the control panel so as to collect the working current of the direct-current circulating pump; a power supply pin of the direct current circulating pump is electrically connected with the control panel; the household gas water heater is controlled by the following steps:
step one, turning on a household gas water heater, wherein the household gas water heater is in a standby state;
step two, the control panel judges whether the user presses the circulation preheating function of the household gas water heater, if so, the control panel turns on the direct current circulating pump, outputs a PWM control signal with fixed frequency and fixed duty ratio to a power supply pin of the direct current circulating pump, and goes to step seven, if not, continues to stand by, and goes to step three;
step three, the control panel judges whether the water flow sensor detects water flow, if so, the step four is carried out;
step four, the control panel opens the burner, and then the step five is carried out;
step five, the control panel judges whether the water flow value detected by the water flow sensor is lower than a preset water flow threshold value, if so, the control panel turns on the direct current circulating pump, outputs a PWM control signal with fixed frequency and fixed duty ratio to a power supply pin of the direct current circulating pump, and goes to step seven; if not, the step six is carried out;
step six, the control panel judges whether the water pressure value fluctuates, if so, the control panel turns on the direct current circulating pump, outputs a PWM control signal with fixed frequency and fixed duty ratio to a power supply pin of the direct current circulating pump, and goes to step seven, if not, the control panel returns to step four;
step seven, the control panel judges whether the rotating speed of the direct current circulating pump is normal through a rotating speed feedback pin of the direct current circulating pump, if the rotating speed of the direct current circulating pump is normal, the step eight is carried out, if the rotating speed of the direct current circulating pump is not normal, a fault alarm signal of the direct current circulating pump is output, and the control panel does not output a control signal to a power supply pin of the direct current circulating pump any more;
step eight, the control panel acquires the working current of the direct current circulating pump through the signal of the signal ground pin of the direct current circulating pump, judges whether the working current of the direct current circulating pump is normal or not, if the working current of the direct current circulating pump is normal, the step nine is carried out, if the working current of the direct current circulating pump is not normal, a fault alarm signal of the direct current circulating pump is output, and the control panel does not output a control signal to the power supply pin of the direct current circulating pump any;
and step nine, the control board judges whether the water flow sensor detects water flow, if so, the control board turns on the direct current circulating pump, outputs a PWM control signal with fixed frequency and fixed duty ratio to a power supply pin of the direct current circulating pump, and goes to step seven, if not, outputs a fault alarm signal of the direct current circulating pump, and the control board does not output a control signal to the power supply pin of the direct current circulating pump any more.
2. A domestic gas water heater according to claim 1, wherein: and a signal ground pin of the direct current circulating pump is electrically connected with the control board after adopting a resistor.
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| CN201711232500.8A CN109855284B (en) | 2017-11-30 | 2017-11-30 | Household gas water heater and control method thereof |
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| CN201711232500.8A CN109855284B (en) | 2017-11-30 | 2017-11-30 | Household gas water heater and control method thereof |
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| CN109855284B true CN109855284B (en) | 2021-04-16 |
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| CN110411033A (en) * | 2019-07-19 | 2019-11-05 | 樱花卫厨（中国）股份有限公司 | Control method and control system for pressurization cycle formula gas heater |
| CN110864459B (en) * | 2019-10-30 | 2021-05-18 | 宁波方太厨具有限公司 | Water circulation control method of gas water heating device |
| CN111174276A (en) * | 2019-12-31 | 2020-05-19 | 华帝股份有限公司 | Wall-mounted boiler zero-cold-water appointment control method |
| CN111322763A (en) * | 2020-02-11 | 2020-06-23 | 华帝股份有限公司 | Double-line zero-cold-water temperature control method and wall-mounted furnace |
| CN114837926A (en) * | 2022-05-06 | 2022-08-02 | 纬湃汽车电子(芜湖)有限公司 | Control method for double fuel pumps |
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| CN102345590B (en) * | 2010-08-03 | 2014-12-24 | 深圳市合信达控制系统有限公司 | Water pump sticking detection method |
| AU2012261603B9 (en) * | 2011-12-21 | 2014-03-20 | Rheem Australia Pty Limited | A Hot Water System Scavenging Method and Arrangement |
| CN203375728U (en) * | 2013-07-05 | 2014-01-01 | 能率(中国)投资有限公司 | Preheating circulation device with fault detecting function |
| CN106766186B (en) * | 2016-12-26 | 2022-06-21 | 广东万家乐燃气具有限公司 | Hot water circulating device with straight-flow pump and control system thereof |
| CN206300351U (en) * | 2016-12-26 | 2017-07-04 | 广东万家乐燃气具有限公司 | A kind of hot water circulating device with straightway pump |
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