TWI245872B - Thermostatic system control method for the gas-operated water heater - Google Patents

Abstract

The present invention is to provide a kind of thermostatic system control method for the gas-operated water heater. The waiting time is added during the process of adjusting the water temperature, and the constant-capacity gas is supplied during the waiting time to stabilize the water temperature. Therefore, when the water temperature is lower than the setting value, the heating process is performed. The waiting time is added when the water temperature is near to the setting value. When the water temperature is higher than the setting value, the temperature-decreasing process is performed. The waiting time is added when the water temperature is near to the setting value. By the way, the temperature deviation can be reduced to keep the water in the constant temperature state.

Description

1245872

[Technical field to which the invention belongs] The present invention relates to a method for controlling the constant temperature system of a gas water heater, and more particularly, to a method for controlling the gas flow to make the water temperature constant. [Previous technology] Gas water heaters are mainly used to provide the appropriate water temperature for people's washing power. External factors often cause the water temperature to be suddenly cold or hot. For 0 gas combustion, the water is heated and washed. . However, the temperature of the water is controlled by the season, water pressure, and gas method, and it is extremely difficult for users. Therefore, the current gas water heaters all provide a constant temperature system control. The block diagram of the circuit of the gas water heater, the main operating principle is that when the hot water faucet is turned on (that is, S · W is ON), the high-pressure ignition (Η · ν) of the igniter IC11 and the mother fire solenoid valve LA are started at the same time to ignite the mother Fire burning 'and when the mother fire ignites within the set time, the mother fire detection (S · N) is then used to activate a micro-fire solenoid valve LB, and further ignite the micro-fire and a main furnace solenoid valve LC, At the same time, the main furnace solenoid valve lc is controlled by the temperature control unit to change the opening and closing of the LC output control circuit, thereby controlling the output of the gas flow a: to determine whether the water temperature is high or low. The microprocessor 1 31 in the temperature control unit 1 3 mainly detects the relationship between the temperature sensor 1 33 and the set temperature 1 35 to control the lc output control circuit 15 to output a proper amount of gas flow. To achieve the effect of regulating water temperature. The temperature sensor 1 3 3 is used to detect the current water temperature, and the set temperature is

1245872

1 33 The difference between the measured instantaneous water temperature and the set temperature, and the gas flow output needed to be adjusted accordingly according to the difference, so that the water temperature can approach the set temperature. When the instantaneous water temperature measured by the temperature sensing rod 1 3 3 is lower than the set temperature, the microcomputer controller 131 causes the LC output control circuit 15 to increase the gas flow in an increasing manner. Otherwise, the temperature measured by the temperature sensing rod 1 3 3 When the water temperature is greater than the set temperature, the controller 131 causes the LC output control circuit 15 to reduce the gas flow in a decreasing manner, and by repeatedly repeating the aforementioned operation of increasing and decreasing the gas flow, the water temperature can be improved. Approaching the set temperature, as shown in the second figure, it is the constant temperature curve of the corresponding time and water temperature. However, the above-disclosed constant temperature control method is still unsatisfactory, because in the process of adjusting the water temperature, the LC output control circuit 15 adjusts the gas flow rate in an increasing or decreasing manner, so it is easy to cause a temperature sensor. 1 3 3 The measured water temperature is not immediate and will be higher or lower than the actual water temperature, which will cause an error in temperature judgment. In this way, the water temperature will rise and fall with large fluctuations. The set temperature is changed. Obviously, in the conventional way, there is still a problem that the water temperature error is too large during warm operation. For the reason, the inventor felt that the above-mentioned deficiency could be improved, and after intensive research and cooperation with the application of theories, he finally proposed a present invention with a reasonable design and effective improvement of the above-mentioned deficiency. [Summary of the Invention] ^ The main object of the present invention is to provide a method for controlling the constant temperature system of a gas water heater, which can reduce the temperature difference and provide a constant temperature output.

Page 6 V. Description of the invention (4) The unit detects the water temperature and adjusts the temperature and joins the learning mode (Magic 3); following the disease, executes the procedure of detecting the water temperature and adjusting the temperature difference (S3〗 5). a After step S315, it is judged one by one whether the temperature sensor is short-circuited and open (S317), whether the temperature switch is not activated (S319), whether the output temperature exceeds 85 ° C (S321), and whether it has been used for more than 20 minutes (s323). If one of the judgments is YES, skip to the error display program (S327), if not, determine whether the water valve is relevant (S 3 2 5), and if yes, return to standby (s 3 〇), otherwise skip to step S3 1 5 Continue execution. / The detailed operation of the temperature difference adjustment procedure in the foregoing step S315 is as follows. After detecting the water temperature, it can be divided into two cases. The first case is that the water temperature is lower than the set water temperature. The temperature control unit controls the gas flow to increase. The heating process is performed, and when the water temperature is close to the set temperature, a waiting time for supplying a fixed amount of gas flow is added to make the water temperature stable when the waiting time approaches the set temperature. The second case is that the water temperature is greater than the set water temperature, the temperature control unit controls the gas flow to perform a temperature reduction process in a decreasing manner, and when the water temperature is close to the set temperature, a section is added to quantify the waiting time for supply in the gas flow. , So that the water temperature can be stabilized by the waiting time approaching the set temperature. Please refer to the fourth figure, which is a timing diagram of the gas flow control of the present invention. After the high-pressure ignition, the mother fire is ignited at 11 and the mother fire is closed until 12 and the water temperature is continuously adjusted by the large and small fires. When the gas water heater is first used, it is a non-quantitative gas flow in the time range of 12 to 13. Time of the temperature adjustment learning mode, the corresponding operation relationship between non-quantitative gas flow and water temperature can be obtained. In the time range of t3 ~ t4, it is a fixed gas flow of 1245872.

Time 'can get quantitative gas flow and water ...' phase "So the subsequent time can be used according to the learning weight of gas water heater in t 2 ~ t 4 L = as a temperature difference adjustment. For example, at the end of t4 temperature recovery, due to the water temperature It has been in a stable state, but the water temperature may be slightly higher or lower than the set temperature. Mouth, ^ ^ ~ ^ $ is adjusted by non-quantitative (increasing or decreasing) gas flow ^ two adjustment processing, as for the gas flow The size can be reduced by an appropriate amount according to the learning of 12 ~ 13 = mode 1, and when the water temperature is close to the set temperature, a certain amount of gas flow is supplied for a period of 15 ~ 16 for temperature recovery, so that After the water temperature shows a stable state, the above-mentioned alternate execution of the water temperature adjustment process and the temperature return process is repeated, so that the water temperature can fluctuate slightly above and below the set water temperature. Please reduce the tile before the gas is near the set time. When the temperature is fixed, the fixed-watt system will be followed. Refer to the fifth figure. The temperature control system increases the gas flow. When the temperature is constant, change to the fixed gas flow rate. Quickly change to the fixed gas flow rate to allow the water to approach the set temperature. Constant temperature curve of time and water temperature by the method of the present invention. Rapid heating at ta 1 causes the water temperature to rise rapidly and is supplied by 疋 i gas, so that the waiting flow at ta ~ t ti makes the water temperature tend to It is stable, while at tb ~ tc, the temperature drops rapidly / JHL, which makes the water temperature drop rapidly, and supplies / near the setting f, so that the waiting time at tc ~ td tends to be stable in a pulse, so the temperature can be controlled by the constant temperature. State. The temperature system control method is based on the following characteristics of the gas water heater through the present invention: 1245872 V. Description of the invention (6) (2) can provide a better constant temperature effect. In summary, the present invention is fully consistent Essentials of Patent Application ', so you filed an application in accordance with the Patent Law. Please check it in detail and ask for a patent as soon as possible. You should feel a sense of virtue in order to protect the rights of the inventor. However, the above description is only a detailed description and a drawing of one of the best specific embodiments of the present invention. Any embodiment that is within the spirit of the patent scope of the present invention and similar changes should be included in The hair Within the scope of the invention, any changes or modifications that can be easily considered by those skilled in the art in the field of the present invention can be covered by the patent scope of the following case.

Page 101245872 Brief description of the drawings [Simplified description of the drawings]: (1) The first diagram is a block diagram of the circuit of the conventional gas water heater; the second diagram is the time and water temperature of the conventional gas water heater Constant temperature curve diagram; the third diagram is the operation flowchart of the gas temperature control system control method of the present invention, the fourth diagram is the time sequence diagram of the gas flow control of the present invention; and the fifth diagram is the gas water heater using the gas temperature control system of the present invention to control Constant temperature curve of method time and water temperature. (2) Illustration of drawing number

1 1 Ignition IC 13 Temperature control unit 131 Microprocessor 13 3 Temperature sensor 135 Set temperature 15 LC output control circuit

Claims (1)

1245872 _ Case No. 92128619_ year month day_i ± i -_ ^ VI. Application for patent scope 6 The control method of the gas water heater constant temperature system as described in item 1 of the scope of patent application, further includes: When the gas water heater is first operated When in use, it is supplied with a quantitative gas flow within a period of time in the temperature-recovery learning mode to obtain a corresponding operating relationship between the quantitative gas flow and the water temperature. 7. The constant temperature system control method for a gas water heater as described in item 6 of the scope of the patent application, wherein the waiting time is based on the quantitative gas flow rate as the supply based on the quantitative gas flow rate and water temperature obtained during the temperature recovery learning mode time. The relationship between the corresponding operations determines the supply of quantitative gas flow. Page 13