A system for reducing the fluctuation of outlet water temperature of gas water heater

Abstract

This patent discloses a system for reducing the fluctuation of the outlet water temperature of a gas water heater, comprising a gas water heater, a water circulation pipeline, a low-temperature water inlet pipe, a flow sensor, and a temperature sensor. The water circulation pipeline is connected to the gas water heater, the cold water pipe is connected to the water circulation pipeline, and there are multiple water outlets on the water circulation pipeline. The temperature sensors are distributed on the gas water heater, the water circulation pipeline and the water outlets. This patent also discloses a temperature control method for a gas water heater. The system uses a plurality of external temperature sensors in the water circulation pipeline and a temperature sensor in the gas water heater to obtain the water temperature and flow parameters in the water circulation pipeline, calculates the water temperature at each position in the water circulation pipeline, and allows the gas water heater to have enough time to respond to the temperature change, and adjusts the power in time according to the actual situation of the user. This optimizes the problem that only the gas water heater body collects data in the traditional way, which causes the gas water heater to be unable to accurately judge the water temperature in the water circulation pipeline and causes large fluctuations in the outlet water temperature, and ensures that the user can output hot water continuously and stably when using water at any time.

Description

Technical Field

[0001] This patent relates to the technical field of gas water heaters, specifically to a gas water heater, and in particular to a system for controlling the outlet water temperature of a gas water heater. Background Art

[0002] Currently, all types of household gas water heaters restrict sensors to the inside of the gas water heater body to facilitate user installation. However, this also makes it difficult for the gas water heater to control the water temperature at a distant water outlet, causing users to wait for the residual cold water in the pipe to drain when they need hot water. This also wastes a lot of clean water, reducing the user experience and making them less willing to use hot water at a distant water outlet.

[0003] In addition, the gas water heater with "zero cold water" function is designed to improve the situation where the water outlet has to wait a long time to get hot water due to the long pipe. However, even with this design, when the hot water circulation loop is working, if the user does not release hot water from the loop, after the hot water completes the circulation and returns to the water inlet of the gas water heater, the water inlet temperature of the gas water heater will suddenly change, making it impossible for the gas water heater to react in time, and eventually causing the hot water temperature in the loop to exceed the set value. There is a risk of low-temperature scalding when the user uses hot water next time. At the same time, cold water will suddenly enter the water inlet of the gas water heater, causing the user to feel very hot at the beginning, and then immediately become cold, and it will return to normal after a period of time. Utility Model Content

[0004] In order to solve at least one of the above problems, this patent provides a gas water heater that achieves constant temperature water output by calculating the water pipe temperature, detects changes in water inlet temperature in advance through a remote sensor, and provides hot water with less temperature fluctuations.

[0005] Another object of this patent is to provide a gas water heater temperature control method.

[0006] The technical solution adopted by this patent includes: a gas water heater, a water circulation pipeline, a cold water pipe, a flow sensor, and a temperature sensor. The water circulation pipeline is connected to the gas water heater, the cold water pipe is connected to the water circulation pipeline, the water circulation pipeline has multiple water outlets, and the temperature sensors are distributed on the gas water heater, the water circulation pipeline and the water outlets.

[0007] The gas water heater can calculate the water temperature at each position in the water pipe through the data of the sensor, and control the heating power according to the data.

[0008] Preferably, the temperature sensor includes a first external temperature sensor, a second external temperature sensor, a water inlet temperature sensor, a water outlet temperature sensor and a water outlet temperature sensor, wherein the first external temperature sensor and the second external temperature sensor on the water circulation pipe are placed more than 1 meter apart.

[0009] Preferably, the water outlet water temperature sensor includes a first water outlet water temperature sensor and a second water outlet water temperature sensor.

[0010] The application process is implemented in the following steps:

[0011] When the device starts, check whether all sensors and equipment are working properly. If a fault occurs, it will stop immediately and display the fault code, then cut off the power.

[0012] After startup, it reads the user-set temperature and working mode, reads the values ​​of each water temperature sensor, and relies on the flow sensor and physical button to determine whether the user uses hot water.

[0013] When the user starts to use it, the gas water heater is started for heating. The water temperature leaving the gas water heater and the water temperature leaving the pipeline at the user's location are obtained through the water outlet and water outlet temperature sensors. The water temperature about to enter the gas water heater is obtained through the first water outlet temperature sensor and the second water outlet temperature sensor. The water flow rate of the flow meter is added to the water temperature entering the gas water heater at each moment, and the water temperature is calculated.

[0014] The heating power of the gas water heater is adjusted according to the above information to reduce the fluctuation of the outlet water temperature.

[0015] Since this patent adopts a distributed sensor structure, the following beneficial effects can be obtained:

[0016] Hot water with a stable temperature can be provided in all scenarios where users use the water heater, reducing the waste of water resources and energy. The gas water heater designed according to this patent does not require major modifications to the traditional gas water heater structure and does not require a lot of re-research and development costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Attached Figure 1 This is an installation diagram designed according to this patent, which includes the composition of the gas water heater, hot water loop, and the installation location of the tap water inlet and sensor. 1. Gas water heater 2. Water circulation pipeline 3. Low-temperature water inlet pipe 4. Water inlet 5. Water outlet 6. Three-way connector 7. Circulation pipeline check valve 8. Low-temperature water inlet pipe check valve 9. First external temperature sensor 10. Second external temperature sensor 11. First water outlet 12. First water outlet temperature sensor 13. Second water outlet 14. Second water outlet temperature sensor

[0018] Attached Figure 2This is a schematic diagram of the internal structure of a gas water heater designed according to this patent. 4. Water inlet 5. Water outlet 15. Flow sensor 16. Water inlet temperature sensor 17. Water pump 18. Water outlet temperature sensor 19. Electronic control unit 20. Gas valve.

[0019] Attached Figure 3 This is a schematic diagram of the water outlet designed according to this patent, 9. First water outlet 10. First water outlet temperature sensor.

[0020] Attached Figure 4 It is a flow chart of the control method designed according to this patent. DETAILED DESCRIPTION

[0021] The present invention will be further described below in the form of embodiments, but the present invention is not limited to the scope of the embodiments.

[0022] Embodiment 1:

[0023] Embodiment 1 of this patent provides a system for reducing the fluctuation of the outlet water temperature of a gas water heater, and the final composition is shown in FIG. Figure 1 As shown, it mainly includes a gas water heater 1, a water circulation pipeline 2 and a low-temperature water inlet pipe 3. The gas water heater includes a water inlet 4, a water outlet 5, a flow sensor 15, a water inlet temperature sensor 16, a water pump 17, a water outlet temperature sensor 18, an electronic control unit 19, and a gas valve 20. The water circulation pipeline 2 is connected to the water inlet 4 and the water outlet 5 of the gas water heater 1. The low-temperature water inlet pipe 3 is connected to the water circulation pipeline 2 through a three-way connector 6. The first external temperature sensor 9 is installed at the water circulation pipeline 2 with a distance of 1 meter from the water inlet 4. On the ring pipe 2, the second external temperature sensor 10 is installed on the water circulation pipe 2 at a distance of more than 1 meter from the first external temperature sensor 9, the circulation pipe one-way valve 7 is installed on the water circulation pipe 2, the low-temperature water inlet pipe one-way valve 8 is installed on the low-temperature water inlet pipe 3 before the three-way connector 6, the first water outlet 11 and the second water outlet 12 are installed on the water circulation pipe 2 after the water outlet 5, and the first water outlet 11 and the second water outlet 12 are respectively installed with the first water outlet temperature sensor 12 and the second water outlet temperature sensor 13.

[0024] In this way, through the above structure, the electronic control unit 19 can collect temperature and flow data from the first external temperature sensor 9, the second external temperature sensor 10, the first water outlet temperature sensor 12, the second water outlet temperature sensor 13, the flow sensor 15, the water inlet temperature sensor 16 and the water outlet temperature sensor 18, and control the working state of the water pump 17 and the gas valve 20 according to the data, specifically:

[0025] When the flow sensor 15 detects that the flow rate suddenly rises from zero, it is determined that the user starts to use water, and the electronic control unit 19 controls the water pump 17 to work and maintain it for at least a period of time.

[0026] When the first external temperature sensor 9 detects a temperature change, the electronic control unit 19 calculates the future change of the water inlet temperature according to the water inlet temperature sensor 16 and waits. When the second external temperature sensor 10 also detects this change, the electronic control unit 19 obtains the arrival time of the changed water temperature from the data of the flow sensor 15, and accurately adjusts the working state of the gas valve 20 at the arrival time to ensure that the water temperature change matches the heating power change, so that the output hot water temperature change is reduced, ensuring the user experience.

[0027] When the first external temperature sensor 9 detects that the temperature is slightly different from that of the water outlet temperature sensor 18, and the temperatures of the first water outlet temperature sensor 12 and the second water outlet temperature sensor 13 are lower than those of the first external temperature sensor 9, it is determined that the user has finished using water. At this time, the electronic control unit 19 adjusts the working state of the gas valve 20 in advance to ensure that the water temperature change matches the heating power change, so that the water temperature maintains the setting and no longer rises, and then turns off the water pump 17 after a period of time.

[0028] This embodiment avoids the sudden change of water temperature entering the gas water heater and causing the gas water heater to be unable to react in time through the mutual coordination between the temperature and flow sensors, the electronic control unit, the water pump and the gas valve, thereby causing the water temperature after heating to change greatly, achieving a constant temperature function and improving the user experience.

[0029] The above is only a preferred specific implementation of this patent and is not intended to limit this application. For any technician familiar with this technical field, this application can have various changes and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of this application should be covered within the scope of protection of this patent. Therefore, the scope of protection of this patent should be based on the scope of protection of the claims.

Claims

1. A system for reducing the fluctuation of water outlet temperature of a gas water heater, characterized in that: include: A gas water heater (1); a water circulation pipe (2) connected to the gas water heater; a low-temperature water inlet pipe (3) connected to the water circulation pipe; wherein the circulation pipe comprises two external water temperature sensors: a first external temperature sensor (9) and a second external temperature sensor (10), and also comprises a circulation pipe check valve (7); the low-temperature water inlet pipe (3) is connected to the water circulation pipe (2) by a three-way connector (6), and the first external temperature sensor (9) and the second external temperature sensor (10) on the water circulation pipe are placed at a distance of more than 1 meter; and the low-temperature water inlet pipe check valve (8) is installed on the low-temperature water inlet pipe (3).

2. The system for reducing the fluctuation of the outlet water temperature of a gas water heater according to claim 1, characterized in that The gas water heater comprises a water inlet (4), a flow sensor (15), a water inlet temperature sensor (16), a water pump (17), a water outlet temperature sensor (18), a water outlet (5), an electronic control unit (19), and a gas valve (20).

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