Scald-proof control method for gas water heater in summer

Abstract

The invention discloses an anti-scald control method for a gas water heater in summer, which comprises a gas distribution rod, a water inlet pipe, a water outlet pipe, a temperature sensor, a heat exchanger and a control mechanism, the gas distribution rod is provided with a first channel, a second channel and a third channel, the outlet of the first channel is communicated with X gas outlet holes, the outlet of the second channel is communicated with Y gas outlet holes, an outlet of the third channel communicates with Z air outlet holes, the first channel is a main channel, the second channel and the third channel are auxiliary channels, the air outlet holes are connected with the heat exchanger, the temperature sensor is arranged in the water outlet pipe, the first flow valve, the second flow valve, the third flow valve and the temperature sensor are electrically connected with the control mechanism, and the control mechanism can set the water outlet temperature. X, Y and Z are all natural numbers larger than one, and X is larger than Y and smaller than Z. The water temperature is not too high in summer.

Description

Technical Field

[0001] This invention relates to a water heater control method, and more particularly to a method for preventing scalding in gas water heaters during summer. Background Technology

[0002] Currently available gas water heaters typically have a temperature setting function. The gas water heater adjusts the opening of the flow valve in real time according to the outlet water temperature to regulate the heat load of the gas water heater, thereby adjusting the outlet water temperature to match the set value. However, in summer, due to the high summer temperatures, the inlet water temperature of the gas water heater is also high. When the user sets the set temperature or the outlet water flow to a lower level, even if the flow valve adjusts the gas flow in the main combustion channel to the minimum value to maintain stable combustion, the heat load of the gas water heater is still too high. In this case, the outlet water temperature cannot match the set temperature, and the outlet water temperature will be higher than the set temperature. This can easily scald the user and make it inconvenient to use. Summary of the Invention

[0003] To overcome the above-mentioned defects, the present invention provides a method for preventing scalding in gas water heaters during summer, which has the advantage that the water temperature is not too high in summer.

[0004] The technical solution adopted by this invention to solve its technical problem is: a method for preventing scalding in a gas water heater during summer, comprising: a gas distribution rod, an inlet pipe, an outlet pipe, a temperature sensor, a heat exchanger, and a control mechanism. The gas distribution rod is provided with a first channel, a second channel, and a third channel. The outlet of the first channel is connected to X gas outlets, the outlet of the second channel is connected to Y gas outlets, and the outlet of the third channel is connected to Z gas outlets. The inlet of the first channel is connected to a gas pipe via a first flow valve, the inlet of the second channel is connected to a gas pipe via a second flow valve, and the inlet of the third channel is connected to a gas pipe via a third flow valve. The first channel is the main channel, and the second and third channels are auxiliary channels. The gas outlets are connected to the heat exchanger, and the two ends of the heat exchanger are connected to the inlet pipe and the outlet pipe, respectively. The temperature sensor is installed inside the outlet pipe. The first flow valve, the second flow valve, the third flow valve, and the temperature sensor are electrically connected to the control mechanism. The control mechanism can set the outlet water temperature. X, Y, and Z are all natural numbers greater than one, where Y < X < Z. The summer scalding control steps are as follows:

[0005] S1. After the hot water tap is turned on, the control mechanism drives the first flow valve to open the first channel. The gas is discharged through the gas outlet of the first channel and then burned to heat the water in the heat exchanger. The temperature sensor detects the outlet water temperature. The control mechanism adjusts the opening of the first flow valve according to the outlet water temperature. If the heat load cannot meet the heating demand when the first flow valve is at its maximum opening, the control mechanism opens the second flow valve and / or the third flow valve according to the demand. Then, the control mechanism fine-tunes the opening of the already opened flow valves according to the outlet water temperature to fine-tune the heat load so that the outlet water temperature is the same as the set temperature. At this time, the normal mode is entered.

[0006] S2. If the water temperature is still higher than the set temperature when the opening of the first flow valve is at the minimum value for maintaining stable combustion, close the first flow valve and adjust the opening of the second flow valve to the minimum value for maintaining stable combustion. At this time, the summer anti-scalding mode is entered.

[0007] S3. When the temperature sensor detects that the outlet water temperature is lower than the set temperature while in summer anti-scalding mode, the second flow valve closes and the opening of the first flow valve is adjusted to the minimum value to maintain stable combustion. The opening of the first flow valve is then finely adjusted according to the outlet water temperature to make the outlet water temperature the same as the set temperature. At this time, the summer anti-scalding mode is exited.

[0008] Alternatively, all the vents may have the same diameter, with X being 3, Y being 2, and Z being 6.

[0009] Optionally, the heat load in the normal mode, from largest to smallest, is divided into four heat load modes: first heat load mode, second heat load mode, third heat load mode, and fourth heat load mode. In the first heat load mode, the first flow valve, the second flow valve, and the third flow valve are open. In the second heat load mode, the first flow valve and the third flow valve are open. In the third heat load mode, the first flow valve and the second flow valve are open. In the fourth heat load mode, the first flow valve is open. When the water heater is in the summer anti-scalding mode, the opening of the second flow valve is not adjustable.

[0010] Optionally, the opening degree of the first flow valve, the second flow valve, and the third flow valve can all be controlled by adjusting the current.

[0011] Optionally, the control mechanism is equipped with a display screen for displaying temperature and a button for adjusting the set temperature. When the water temperature is higher than the set temperature in the summer anti-scalding mode, the control mechanism closes the first flow valve, the second flow valve, and the third flow valve.

[0012] Optionally, the minimum heat load of the fourth heat load mode is 3.6 kW, and the heat load of the summer anti-scalding mode is 2.4 kW.

[0013] The beneficial technical effects of this invention are as follows: The summer anti-scalding control method for gas water heaters includes: a gas distribution rod, an inlet pipe, an outlet pipe, a temperature sensor, a heat exchanger, and a control mechanism. When the first flow valve is at its minimum opening to maintain stable combustion, and the outlet water temperature is still higher than the set temperature, the second channel, which has the fewest gas outlet holes, is used solely for heating water, instead of the auxiliary channel originally used for temperature regulation. This provides a smaller heat load than using only the first channel for heating, thus preventing the outlet water temperature from becoming too high in summer. It has the advantage of preventing the water temperature from becoming too high in summer. Attached Figure Description

[0014] Figure 1 This is a flowchart of the operation steps of the present invention;

[0015] Figure 2 This is the control flowchart of the present invention;

[0016] Figure 3 This is a schematic diagram of the structure of the gas distribution bar of the present invention;

[0017] Figure 4 This is a schematic diagram of the heat load for different heat load modes and the summer anti-scalding mode of the present invention;

[0018] Figure 5 This is a schematic diagram of the minimum heat load of the fourth heat load mode of the present invention and the outlet water temperature of the summer anti-scalding mode under different inlet water volumes.

[0019] in:

[0020] 1. Air distribution rod; 11. First channel; 12. Second channel; 13. Third channel; 14. Air outlet; 21. First flow valve; 22. Second flow valve; 23. Third flow valve. Detailed Implementation

[0021] In order to better understand the technical means of the present invention and to implement it in accordance with the contents of the specification, the specific embodiments of the present invention will be further described in detail below with reference to the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0022] This specific embodiment details the summer scalding control method for gas water heaters described in this application, such as... Figures 1-5As shown, the summer anti-scalding control method for gas water heaters includes: a gas distribution rod 1, an inlet pipe, an outlet pipe, a temperature sensor, a heat exchanger, and a control mechanism. The gas distribution rod 1 is equipped with a first channel 11, a second channel 12, and a third channel 13. The outlet of the first channel 11 is connected to X gas outlets 14, the outlet of the second channel 12 is connected to Y gas outlets 14, and the outlet of the third channel 13 is connected to Z gas outlets 14. The inlet of the first channel 11 is connected to the gas pipe via a first flow valve 21, and the inlet of the second channel 12 is connected to the gas pipe via a second flow valve 22. The gas pipe, the inlet of the third channel 13 is connected to the gas pipe through the third flow valve 23. The first channel 11 is the main channel, and the second channel 12 and the third channel 13 are auxiliary channels. The gas outlet 14 is connected to the heat exchanger. The two ends of the heat exchanger are connected to the water inlet pipe and the water outlet pipe, respectively. The temperature sensor is set in the water outlet pipe. The first flow valve 21, the second flow valve 22, the third flow valve 23 and the temperature sensor are electrically connected to the control mechanism. The control mechanism can set the water outlet temperature. X, Y and Z are all natural numbers greater than one, Y < X < Z. The summer anti-scalding control steps are as follows:

[0023] S1. After the hot water tap is turned on, the control mechanism drives the first flow valve 21 to open the first channel 11. The gas is discharged through the gas outlet 14 of the first channel 11 and then burned to heat the water in the heat exchanger. The temperature sensor detects the outlet water temperature. The control mechanism adjusts the opening of the first flow valve 21 according to the outlet water temperature. If the heat load cannot meet the heating demand when the first flow valve 21 is at its maximum opening, the control mechanism opens the second flow valve 22 and / or the third flow valve 23 according to the demand. Then, the control mechanism fine-tunes the opening of the opened flow valves according to the outlet water temperature to fine-tune the heat load so that the outlet water temperature is the same as the set temperature. At this time, the normal mode is entered.

[0024] S2. If the water temperature is still higher than the set temperature when the opening of the first flow valve 21 is at the minimum value for maintaining stable combustion, close the first flow valve 21 and adjust the opening of the second flow valve 22 to the minimum value for maintaining stable combustion. At this time, the summer anti-scalding mode is entered.

[0025] S3. When the temperature sensor detects that the outlet water temperature is lower than the set temperature in the summer anti-scalding mode, the second flow valve 22 closes and the opening of the first flow valve 21 is adjusted to the minimum value to maintain stable combustion. The opening of the first flow valve 21 is then fine-tuned according to the outlet water temperature to make the outlet water temperature the same as the set temperature. At this point, the summer anti-scalding mode is exited. The gas water heater in this embodiment has a main channel and an auxiliary channel. In normal mode, the main channel (first channel 11) is always open, while the auxiliary channels (second channel 12 and third channel 13) are only opened when needed. To facilitate fine-tuning of the heat load, the number of gas outlets 14 in the second channel 12 is less than that in the first channel 11. With the same gas output from a single gas outlet 14, the total gas output of the second channel 12 is less than that of the first channel 11. Therefore, the second channel 12 can maintain stable combustion with less gas (whether stable combustion can be maintained depends on whether the gas output from each gas outlet 14 reaches the minimum flow rate). Since the amount of air output from each vent 14 to maintain stable combustion is fixed, and the second channel 12, with its fewer vents 14, can maintain stable combustion with a smaller total air output, using the second channel 12 for heating provides a smaller heat load. Even when the first flow valve 21 is at its minimum opening to maintain stable combustion, if the outlet water temperature is still higher than the set temperature, by utilizing the minimal number of vents 14 in the second channel 12, the auxiliary channel originally used for temperature regulation, i.e., the second channel 12, can be used solely for heating water. This provides a smaller heat load than using only the first channel 11 for heating, thus preventing excessively high outlet water temperatures in summer. This has the advantage of preventing excessively high water temperatures in summer.

[0026] Optionally in this embodiment, the diameters of the air outlets 14 are the same, with X being 3, Y being 2, and Z being 6.

[0027] Optionally, in this embodiment, the heat load in normal mode, from largest to smallest, is divided into four heat load modes: a first heat load mode, a second heat load mode, a third heat load mode, and a fourth heat load mode. In the first heat load mode, the first flow valve 21, the second flow valve 22, and the third flow valve 23 are open; in the second heat load mode, the first flow valve 21 and the third flow valve 23 are open; in the third heat load mode, the first flow valve 21 and the second flow valve 22 are open; and in the fourth heat load mode, the first flow valve 21 is open. When the water heater is in summer anti-scalding mode, the opening of the second flow valve 22 is not adjustable. In this embodiment, the minimum heat load of the first heat load mode is the same as the maximum heat load of the second heat load mode; the minimum heat load of the second heat load mode is the same as the maximum heat load of the third heat load mode; and the minimum heat load of the third heat load mode is the same as the maximum heat load of the fourth heat load mode. Thus, the heat load range covered by the first, second, third, and fourth heat load modes is seamless, allowing for continuous temperature adjustment and smooth transitions between different heat load modes.

[0028] Optionally in this embodiment, the opening degree of the first flow valve 21, the second flow valve 22, and the third flow valve 23 is controlled by adjusting the current.

[0029] Optionally in this embodiment, the control mechanism is equipped with a display screen for showing the temperature and a button for adjusting the set temperature. When the water heater is in summer anti-scalding mode and the outlet water temperature is higher than the set temperature, the control mechanism closes the first flow valve 21, the second flow valve 22, and the third flow valve 23. When the summer anti-scalding mode cannot lower the outlet water temperature below the set value, the control mechanism controls the gas water heater to shut down to prevent the user from being scalded. In this situation, the user can also increase the inlet water flow to lower the outlet water temperature so that they can continue to use the water.

[0030] Optionally, in this embodiment, the minimum heat load of the fourth heat load mode is 3.6 kW, and the heat load of the summer anti-scalding mode is 2.4 kW.

[0031] The summer anti-scalding control method for gas water heaters in this embodiment has the advantage that the water temperature is not too high in summer.

Claims

1. A method for preventing scalding in gas water heaters during summer, characterized in that, include: The gas distribution rod (1) includes an inlet pipe, an outlet pipe, a temperature sensor, a heat exchanger, and a control mechanism. The gas distribution rod (1) is equipped with a first channel (11), a second channel (12), and a third channel (13). The outlet of the first channel (11) is connected to X gas outlets (14), the outlet of the second channel (12) is connected to Y gas outlets (14), and the outlet of the third channel (13) is connected to Z gas outlets (14). The inlet of the first channel (11) is connected to the gas pipe through a first flow valve (21), and the inlet of the second channel (12) is connected to the gas pipe through a second flow valve (22). The inlet of the three-channel (13) is connected to the gas pipe through the third flow valve (23). The first channel (11) is the main channel, and the second channel (12) and the third channel (13) are auxiliary channels. The gas outlet (14) is connected to the heat exchanger. The two ends of the heat exchanger are connected to the water inlet pipe and the water outlet pipe, respectively. The temperature sensor is set in the water outlet pipe. The first flow valve (21), the second flow valve (22), the third flow valve (23) and the temperature sensor are electrically connected to the control mechanism. The control mechanism can set the water outlet temperature. X, Y and Z are all natural numbers greater than one, Y < X < Z. The summer anti-scalding control steps are as follows: S1. After turning on the hot water tap, the control mechanism drives the first flow valve (21) to open the first channel (11). The gas is discharged through the gas outlet (14) of the first channel (11) and then burned to heat the water in the heat exchanger. The temperature sensor detects the outlet water temperature. The control mechanism adjusts the opening of the first flow valve (21) according to the outlet water temperature. If the heat load cannot meet the heating demand under the maximum opening of the first flow valve (21), the control mechanism opens the second flow valve (22) and / or the third flow valve (23) according to the demand. Then the control mechanism fine-tunes the opening of the flow valves that have been opened according to the outlet water temperature to fine-tune the heat load so that the outlet water temperature is the same as the set temperature. At this time, the normal mode is entered. S2. If the water temperature is still higher than the set temperature when the opening of the first flow valve (21) is at the minimum value for maintaining stable combustion, close the first flow valve (21) and adjust the opening of the second flow valve (22) to the minimum value for maintaining stable combustion. At this time, enter the summer anti-scalding mode. S3. When the temperature sensor detects that the outlet water temperature is lower than the set temperature in the summer anti-scalding mode, the second flow valve (22) is closed and the opening of the first flow valve (21) is adjusted to the minimum value to maintain stable combustion. The opening of the first flow valve (21) is then finely adjusted according to the outlet water temperature so that the outlet water temperature is the same as the set temperature. At this time, the summer anti-scalding mode is exited.

2. The method for preventing scalding in gas water heaters during summer according to claim 1, characterized in that: All the vents (14) have the same diameter, with X being 3, Y being 2, and Z being 6.

3. The method for preventing scalding in gas water heaters during summer according to claim 1, characterized in that: In the normal mode, the heat load from large to small are the first heat load mode, the second heat load mode, the third heat load mode and the fourth heat load mode. In the first heat load mode, the first flow valve (21), the second flow valve (22) and the third flow valve (23) are open. In the second heat load mode, the first flow valve (21) and the third flow valve (23) are open. In the third heat load mode, the first flow valve (21) and the second flow valve (22) are open. In the fourth heat load mode, the first flow valve (21) is open. When the water heater is in the summer anti-scalding mode, the opening of the second flow valve (22) is not adjustable.

4. The method for preventing scalding in gas water heaters during summer according to claim 1, characterized in that: The opening degree of the first flow valve (21), the second flow valve (22) and the third flow valve (23) is controlled by adjusting the current.

5. The method for preventing scalding in gas water heaters during summer according to claim 1, characterized in that: The control mechanism is equipped with a display screen for displaying temperature and a button for adjusting the set temperature. When the water heater is in summer anti-scalding mode and the outlet water temperature is higher than the set temperature, the control mechanism closes the first flow valve (21), the second flow valve (22) and the third flow valve (23).

6. The method for preventing scalding in gas water heaters during summer according to claim 3, characterized in that: The minimum heat load of the fourth heat load mode is 3.6 kW, and the heat load of the summer anti-scalding mode is 2.4 kW.

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