CN104964459B - Fire electric water heating system and fire the control method of electric water heating system - Google Patents

Abstract

The invention discloses a fuel-fired hot water system, comprising: a gas water heater; a constant temperature device, the constant temperature device includes an electric water heater assembly, a constant temperature assembly and a three-way valve, the first end of the three-way valve is connected to the outlet pipe of the gas water heater, and the three-way The second end of the valve is connected to the water supply pipe, the third end of the three-way valve is connected to the second water inlet of the thermostatic assembly; the first temperature sensor; the controller, the controller is used to obtain the water temperature at the water outlet of the thermostatic assembly and the gas water heater The temperature difference between the water temperatures in the outlet pipe, when the temperature difference is greater than the preset temperature threshold, the first end of the control three-way valve is connected to the third end; when the temperature difference is less than or equal to the preset temperature threshold , the second end of the control three-way valve communicates with the third end. The gas-fired hot water system solves the problem of cold water in the pipeline by controlling the three-way valve, and provides hot water with constant water temperature to meet user comfort requirements. The invention also discloses a control method of the electric heating water heating system.

Description

Gas-fired hot water system and control method for gas-fired hot water system

technical field

The invention relates to the technical field of hot water systems, in particular to an electric hot water system and a control method for the electric hot water system.

Background technique

With the continuous improvement of users' requirements for hot water, a single water heater can no longer meet the requirements of users, especially some users who have high requirements for bathing comfort. Different water temperatures, multiple points of bathing at the same time, etc.

Based on the continuous improvement of users' requirements for bathing comfort, users' requirements for water heaters are also getting higher and higher. Therefore, it is necessary to improve the water heaters.

Contents of the invention

The object of the present invention is to solve at least one of the above-mentioned technical drawbacks. Therefore, an object of the present invention is to provide a fuel-fired hot water system that can solve the problem of cold water in pipelines and provide hot water with constant water temperature to meet user comfort requirements.

Another object of the present invention is to provide a control method for a fuel-fired hot water system.

In order to achieve the above object, an embodiment of an aspect of the present invention proposes a fuel-fired hot water system, comprising: a gas water heater, the water inlet pipe of the gas water heater is connected to the water supply pipe; a constant temperature device, the constant temperature device includes an electric water heater assembly, a constant temperature component and a three-way valve, the water inlet of the electric water heater component is connected to the outlet pipe of the gas water heater, the water outlet of the electric water heater component is connected to the first water inlet of the thermostatic component, and the three-way valve The first end is connected to the water outlet pipe of the gas water heater, the second end of the three-way valve is connected to the water supply pipe, the third end of the three-way valve is connected to the second water inlet of the thermostatic assembly, The water outlet of the thermostatic assembly is connected to the first water end; the first temperature sensor is used to detect the water temperature in the water outlet pipe of the gas water heater; and the controller is connected with the The first temperature sensor is connected to the three-way valve, and the controller is used to obtain the temperature difference between the water temperature at the water outlet of the thermostatic assembly and the water temperature in the water outlet pipe of the gas water heater, wherein, when the When the water temperature in the water outlet pipe is lower than the water temperature at the water outlet and the temperature difference is greater than a preset temperature threshold, the controller controls the first end of the three-way valve to communicate with the third end; otherwise, the The controller controls the second end of the three-way valve to communicate with the third end.

According to the gas-fired hot water system of the embodiment of the present invention, the water inlet pipe of the gas water heater is connected to the water supply pipe, and the constant temperature device includes an electric water heater assembly, a constant temperature assembly and a three-way valve, and the water inlet of the electric water heater assembly is connected to the water outlet pipe of the gas water heater. The water outlet of the water heater assembly is connected to the first water inlet of the thermostat assembly, the first end of the three-way valve is connected to the outlet pipe of the gas water heater, the second end of the three-way valve is connected to the water supply pipe, and the third end of the three-way valve is connected to to the second water inlet of the constant temperature component, the water outlet of the constant temperature component is connected to the first water end, the first temperature sensor detects the water temperature in the outlet pipe of the gas water heater, the controller is connected with the first temperature sensor and the three-way valve respectively, and the controller Obtain the temperature difference between the water temperature at the water outlet of the constant temperature component and the water temperature in the water outlet pipe of the gas water heater. When the water temperature in the water outlet pipe is lower than the water temperature at the water outlet and the temperature difference is greater than the preset temperature threshold, the controller controls The first end of the three-way valve communicates with the third end; otherwise, the controller controls the second end of the three-way valve to communicate with the third end, so as to solve the problem of cold water in the pipeline through the control of the three-way valve, and provide Hot water with constant water temperature reaches the water end to meet user comfort requirements.

According to an embodiment of the present invention, the controller also adjusts the water intake ratio of the first water inlet and the second water inlet of the thermostatic assembly according to the water temperature at the water outlet of the thermostatic assembly.

According to an embodiment of the present invention, the thermostatic component is an electronic thermostatic valve.

According to an embodiment of the present invention, the water supply pipe is further provided with a check valve.

According to an embodiment of the present invention, the outlet pipe of the gas water heater is also connected to a second water end.

Preferably, the preset temperature threshold may be 4-6°C.

In order to achieve the above purpose, another embodiment of the present invention proposes a control method for a gas-fired hot water system, the gas-fired water heater includes a gas water heater and a constant temperature device, the water inlet pipe of the gas water heater is connected to the water supply pipe, the The thermostatic device includes an electric water heater assembly, a thermostatic assembly and a three-way valve, the water inlet of the electric water heater assembly is connected to the outlet pipe of the gas water heater, and the water outlet of the electric water heater assembly is connected to the first water inlet, the first end of the three-way valve is connected to the outlet pipe of the gas water heater, the second end of the three-way valve is connected to the water supply pipe, and the third end of the three-way valve is connected to the The second water inlet of the thermostat assembly, the water outlet of the thermostat assembly is connected to the first water end, and the control method includes the following steps: detecting the water temperature in the outlet pipe of the gas water heater; Obtain the temperature difference between the water temperature at the water outlet of the thermostatic assembly and the water temperature in the water outlet pipe of the gas water heater, and judge the temperature difference; if the water temperature in the water outlet pipe is less than the The water temperature at the water outlet and the temperature difference is greater than the preset temperature threshold, then control the first end of the three-way valve to communicate with the third end; if the water temperature in the water outlet pipe is greater than or equal to the temperature at the water outlet water temperature, or the water temperature in the water outlet pipe is lower than the water temperature at the water outlet and the temperature difference is less than or equal to the preset temperature threshold, then control the second end and the third end of the three-way valve connected.

According to the control method of the gas-fired hot water system in the embodiment of the present invention, the water temperature in the water outlet pipe of the gas water heater is firstly detected, and then the water temperature at the water outlet of the constant temperature component and the water temperature in the water outlet pipe of the gas water heater are obtained according to the water temperature in the water outlet pipe of the gas water heater and judge the temperature difference. If the water temperature in the outlet pipe is lower than the water temperature at the water outlet and the temperature difference is greater than the preset temperature threshold, the first end and the third end of the three-way valve are controlled. Otherwise, control the second end of the three-way valve to communicate with the third end, so as to solve the problem of cold water in the pipeline through the control of the three-way valve, and provide hot water with constant water temperature to the water end through the constant temperature component to meet user comfort requirements .

According to an embodiment of the present invention, the control method of the above-mentioned fuel-fired hot water system further adjusts the water intake ratio of the first water inlet and the second water inlet of the thermostat assembly according to the water temperature at the water outlet of the thermostat assembly.

Preferably, the preset temperature threshold may be 4-6°C.

Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.

Description of drawings

The above and/or additional aspects and advantages of the present invention will become apparent and easy to understand from the following description of the embodiments in conjunction with the accompanying drawings, wherein:

Fig. 1 is a schematic block diagram of a fuel-fired hot water system according to an embodiment of the present invention.

Fig. 2 is a schematic block diagram of a fuel-fired hot water system according to another embodiment of the present invention.

Fig. 3 is a flow chart of a control method of a fuel-fired hot water system according to an embodiment of the present invention.

Reference numerals: gas water heater 10 , thermostatic device 20 , electric water heater assembly 21 , thermostatic assembly 22 , three-way valve 23 , first temperature sensor 30 , first water end 41 , second water end 42 and check valve 50 .

detailed description

Embodiments of the present invention are described in detail below, examples of which are shown in the drawings, wherein the same or similar reference numerals designate the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the figures are exemplary only for explaining the present invention and should not be construed as limiting the present invention.

The following disclosure provides many different embodiments or examples for implementing different structures of the present invention. To simplify the disclosure of the present invention, components and arrangements of specific examples are described below. Of course, they are only examples and are not intended to limit the invention. Furthermore, the present invention may repeat reference numerals and/or letters in different instances. This repetition is for the purpose of simplicity and clarity and does not in itself indicate a relationship between the various embodiments and/or arrangements discussed. In addition, various specific process and material examples are provided herein, but one of ordinary skill in the art will recognize the applicability of other processes and/or the use of other materials. Additionally, configurations described below in which a first feature is "on" a second feature may include embodiments where the first and second features are formed in direct contact, and may include additional features formed between the first and second features. For example, such that the first and second features may not be in direct contact.

In the description of the present invention, it should be noted that unless otherwise specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a mechanical connection or an electrical connection, or it can be two The internal communication of each element may be directly connected or indirectly connected through an intermediary. Those skilled in the art can understand the specific meanings of the above terms according to specific situations.

The fuel-fired water heating system and the control method of the fuel-fired water heating system proposed by the embodiments of the present invention are described below with reference to the accompanying drawings.

Fig. 1 is a schematic block diagram of a fuel-fired hot water system according to an embodiment of the present invention. As shown in FIG. 1 , the fuel-fired hot water system includes a gas water heater 10 , a thermostat 20 , a first temperature sensor 30 and a controller (not specifically shown in the figure).

Wherein, the water inlet pipe of the gas water heater 10 is connected to the water supply pipe. The thermostatic device 20 includes an electric water heater assembly 21, a thermostatic assembly 22 and a three-way valve 23. The water inlet of the electric water heater assembly 21 is connected to the water outlet pipe of the gas water heater 10, and the water outlet of the electric water heater assembly 21 is connected to the first inlet of the thermostatic assembly 22. Water outlet, the first end of the three-way valve 23 is connected to the water outlet pipe of the gas water heater 10, the second end of the three-way valve 23 is connected to the water supply pipe, and the third end of the three-way valve 23 is connected to the second water inlet of the thermostat assembly 22 , the water outlet of the thermostatic assembly 22 is connected to the first water end 41 . The first temperature sensor 30 is used to detect the water temperature in the outlet pipe of the gas water heater 10 . The controller is respectively connected with the first temperature sensor 30 and the three-way valve 23, and the controller is used to obtain the temperature difference between the water temperature at the water outlet of the thermostatic assembly 22 and the water temperature in the water outlet pipe of the gas water heater 10, wherein, when the water outlet pipe When the water temperature at the water outlet is lower than the water temperature at the water outlet and the temperature difference is greater than the preset temperature threshold, the controller controls the first end of the three-way valve 23 to communicate with the third end; otherwise, the controller controls the second end of the three-way valve 23 to communicate with the third end. connected to the third terminal.

Wherein, the temperature threshold can be calibrated according to the actual situation. Preferably, the preset temperature threshold may be 4-6°C.

Specifically, as users' requirements for hot water continue to increase, gradually a single water heater can no longer meet the requirements of users, especially some users who have high requirements for bathing comfort. Different water temperatures can be provided at different times, and multiple points can be bathed at the same time. Based on the continuous improvement of users' requirements for bathing comfort, users' requirements for water heaters are also getting higher and higher. If a combination of gas water heaters and electric heating systems is used, although it can provide a steady stream of hot water, due to the electric heating system The volume is very large, and the installation in the bathroom will make the user feel very depressed, and the electric water heating system needs to be installed after the user has finished the decoration, and a lot of open pipes need to be arranged, which seriously affects the appearance of the bathroom, and the installation cost is relatively high. Therefore, the embodiment of the present invention satisfies user requirements by adding a constant temperature device at the end of the gas water heater.

As shown in FIG. 1 , one end of the water supply pipe is connected to the municipal water supply, and the other end of the water supply pipe is respectively connected to the gas water heater 10 and each water terminal. The fuel-fired hot water system may include a thermostat 20, which consists of an electric water heater assembly 21, a thermostat assembly 22 and a three-way valve 23, and the electric water heater assembly 21 includes a water storage tank and a heat pipe. The thermostat 20 has two water inlets and one water outlet, wherein the water inlet of the electric water heater assembly 21 is connected to the outlet pipe of the gas water heater 10 as the hot water inlet of the thermostat 20, and the second end of the three-way valve 23 is used as a thermostat The cold water inlet of the device 20 is connected to the water supply pipe, and the water outlet of the thermostat assembly 22 is connected to the first water end 41 as the water outlet of the thermostat 20 . The water coming out of the gas water heater 10 first passes through the electric water heater assembly 21 or the three-way valve 23 and then enters the thermostatic assembly 22, through which the hot water at the temperature required by the user is output.

Specifically, when installing a gas-fired hot water system, by opening the hot water outlet of the first water end 41 to start the gas water heater 10 in a self-starting manner, for example, when the gas water When the water flow detected by the water heater 10 reaches a certain value, the ignition is started; for heating. When the water heated by the gas water heater 10 flows to the thermostat 20 , the first temperature sensor 30 in the thermostat 20 detects the temperature of the water in the outlet pipe of the gas water heater 10 . When the water temperature in the water outlet pipe of the gas water heater 10 detected by the first temperature sensor 30 is greater than or equal to the water temperature of the water outlet of the thermostat assembly 22 minus 5°C, that is, the water temperature of the hot water inlet of the thermostat 20 is greater than or equal to that of the thermostat 20 When the water temperature at the water outlet is minus 5°C, the controller controls the second end of the three-way valve 23 to communicate with the third end, that is, the three-way valve 23 connects the second water inlet of the thermostatic component 22 with the water supply pipe, and the water supply pipe The cold water directly enters the thermostatic assembly 22, mixes with the hot water from the electric water heater assembly 21, and outputs it to the first water end 41; The water temperature minus 5°C, that is, when the water temperature of the hot water inlet of the thermostat 20 is lower than the water temperature of the water outlet of the thermostat 20 minus 5°C, the controller controls the first end of the three-way valve 23 to communicate with the third end, that is The three-way valve 23 connects the second water inlet of the thermostatic assembly 22 with the outlet pipe of the gas water heater 10, and the hot water output by the gas water heater 10 enters the thermostat 20 and is divided into two paths, one path is directly output to the electric water heater assembly 21, and the other path passes through three After passing through the valve 23, it is output to the second water inlet of the thermostatic assembly 22. Finally, the hot water at the temperature required by the user is output through the thermostatic assembly 22 .

Among them, the purpose of adding the three-way valve 23 is that when there is cold water in the pipeline between the gas water heater 10 and the thermostat 20, by controlling the three-way valve 23, most of the cold water directly enters the thermostat assembly 22, and the electric water heater assembly 21 Mix the hot water coming out, and at the same time make a small part of cold water directly enter the electric water heater assembly 21 to ensure that the water temperature in the electric water heater assembly 21 will not drop too much or drop too fast, thereby effectively solving the problem between the gas water heater 10 and the thermostat 20 There is a problem of cold water in the pipeline; when there is hot water in the pipeline between the gas water heater 10 and the thermostat 20, all the hot water from the gas water heater 10 enters the electric water heater assembly 21 to ensure that the water temperature in the electric water heater assembly 21 is reasonable. In the range.

According to an embodiment of the present invention, the controller also adjusts the water intake ratio of the first water inlet and the second water inlet of the thermostatic assembly 22 according to the water temperature at the water outlet of the thermostatic assembly 22 .

Specifically, in order to meet user comfort requirements and ensure a constant water temperature at the water outlet of the thermostat 20, the controller adjusts the water inlets of the first water inlet and the second water inlet of the thermostat 22 according to the water temperature at the water outlet of the thermostat 22. The ratio is to continuously provide users with hot water at the desired temperature. And when there is no cold water in the water supply pipe, the controller also controls the water outlet of the thermostat 20 to close, so as to avoid scalding the user by hot water with a higher temperature.

In addition, when the gas-fired hot water system provides hot water for multiple bathrooms, a thermostat can be installed in each bathroom, and different bathrooms can be set with different outlet water temperatures. The water temperature at the water outlet of the constant temperature component in the device automatically adjusts the water inlet ratio of the first water inlet and the second water inlet of the corresponding constant temperature component to meet the requirements of different users. Among them, the user can set the outlet water temperature of the constant temperature device through the smart terminal, which is easy to operate.

According to an embodiment of the present invention, the thermostatic component 22 is an electronic thermostatic valve. The electronic thermostatic valve can automatically adjust the ratio of cold and hot water inlets according to the water temperature required by the user and the water temperature at the water outlet of the thermostat 20, thereby accurately controlling the water temperature at the water outlet.

According to an embodiment of the present invention, as shown in FIG. 2 , the outlet pipe of the gas water heater 10 is also connected to a second water end 42 .

It should be noted that, when the user does not require high temperature of hot water, the gas water heater 10 can be directly connected to the water end.

According to an embodiment of the present invention, an electric water heater may also be provided in the electric water heater assembly 21 , and the electric water heater heats the heating pipe to heat the water stored in the water storage tank of the electric water heater assembly 21 .

Specifically, the capacity of the electric water heater assembly 21 can be about 6L, and an electric water heater can be arranged inside, and its heating efficiency is relatively high. Electricity protection wall to ensure water safety. Since the capacity of the electric water heater assembly 21 is about 6L, and the volume of the thermostat assembly 22 is relatively small, the volume of the thermostat 20 is relatively small, so small that it can be hidden in a cabinet under the wash basin in the bathroom, and does not take up valuable space in the bathroom. Beautiful and generous.

According to an embodiment of the present invention, as shown in FIG. 1 or FIG. 2 , a check valve 50 is provided on the water supply pipe to effectively prevent the water in the water tank of the gas water heater 10 and the water at each water end from flowing backwards.

In summary, according to the gas-fired hot water system of the embodiment of the present invention, the water inlet pipe of the gas water heater is connected to the water supply pipe, the constant temperature device includes an electric water heater assembly, a constant temperature assembly and a three-way valve, and the water inlet of the electric water heater assembly is connected to the gas water heater. The outlet pipe of the electric water heater assembly is connected to the first water inlet of the thermostat assembly, the first end of the three-way valve is connected to the outlet pipe of the gas water heater, the second end of the three-way valve is connected to the water supply pipe, and the three-way valve The third end of the thermostat is connected to the second water inlet of the thermostat assembly, the water outlet of the thermostat assembly is connected to the first water end, the first temperature sensor detects the water temperature in the outlet pipe of the gas water heater, and the controller communicates with the first temperature sensor and the tee respectively. The valve is connected, and the controller obtains the temperature difference between the water temperature at the water outlet of the thermostatic component and the water temperature in the water outlet pipe of the gas water heater. When the water temperature in the water outlet pipe is lower than the water temperature at the water outlet and the temperature difference is greater than the preset temperature threshold , the controller controls the first end of the three-way valve to communicate with the third end; otherwise, the controller controls the second end of the three-way valve to communicate with the third end, so that the problem of cold water in the pipeline can be solved by controlling the three-way valve. And through the constant temperature components, hot water with constant water temperature is continuously provided to the water end to meet the comfort requirements of users.

Fig. 3 is a flow chart of a control method for a gas-fired water heating system according to an embodiment of the present invention, wherein the gas-fired water heating system includes a gas water heater and a constant temperature device, the water inlet pipe of the gas water heater is connected to the water supply pipe, and the temperature control device includes an electric water heater assembly, The thermostat assembly and the three-way valve, the water inlet of the electric water heater assembly is connected to the outlet pipe of the gas water heater, the water outlet of the electric water heater assembly is connected to the first water inlet of the thermostat assembly, and the first end of the three-way valve is connected to the outlet pipe of the gas water heater In the water pipe, the second end of the three-way valve is connected to the water supply pipe, the third end of the three-way valve is connected to the second water inlet of the thermostatic assembly, and the water outlet of the thermostatic assembly is connected to the first water end.

Specifically, as shown in FIG. 1 , one end of the water supply pipe is connected to the municipal water supply, and the other end of the water supply pipe is respectively connected to the gas water heater and each water terminal. The gas-fired hot water system may include a thermostatic device, which consists of an electric water heater assembly, a thermostatic assembly and a three-way valve, and the electric water heater assembly includes a water storage tank and a heating pipe. The thermostatic device has two water inlets and one water outlet, wherein the water inlet of the electric water heater assembly is used as the hot water inlet of the thermostatic device to connect with the outlet pipe of the gas water heater, and the second end of the three-way valve is used as the cold water inlet of the thermostatic device It is connected with the water supply pipe, and the water outlet of the constant temperature component is connected with the first water end as the water outlet of the constant temperature device.

As shown in Figure 3, the control method of the fuel-fired hot water system includes the following steps:

S1, detecting the water temperature in the outlet pipe of the gas water heater.

For example, the water temperature in the outlet pipe of the gas water heater can be detected by the first temperature sensor installed at the water inlet of the electric water heater assembly.

S2. Obtain the temperature difference between the water temperature at the water outlet of the thermostatic component and the water temperature in the water outlet pipe of the gas water heater according to the water temperature in the water outlet pipe of the gas water heater, and judge the temperature difference.

S3, if the water temperature in the water outlet pipe is lower than the water temperature at the water outlet and the temperature difference is greater than a preset temperature threshold, control the first end of the three-way valve to communicate with the third end.

S4, if the water temperature in the water outlet pipe is greater than or equal to the water temperature at the water outlet, or the water temperature in the water outlet pipe is lower than the water temperature at the water outlet and the temperature difference is less than or equal to the preset temperature threshold, then control the second end of the three-way valve and The third end is connected.

Preferably, the preset temperature threshold may be 4-6°C.

Specifically, when installing a gas-fired hot water system, the gas water heater can be started by itself by opening the hot water outlet of the first water end. For example, when the gas water heater is started by water flow, the water detected by the gas When the flow reaches a certain value, the ignition is started; when the gas water heater is started by water pressure, the ignition is started when the gas water heater detects that the water pressure reaches a certain value, so as to heat the water in the water tank of the gas water heater. When the water heated by the gas water heater flows to the constant temperature device, the first temperature sensor in the constant temperature device detects the water temperature in the water outlet pipe of the gas water heater. When the water temperature in the water outlet pipe of the gas water heater detected by the first temperature sensor is greater than or equal to the water temperature of the water outlet of the thermostatic assembly minus 5°C, that is, the water temperature of the hot water inlet of the thermostatic device is greater than or equal to the water temperature of the water outlet of the thermostatic device minus 5°C. When the temperature drops to 5°C, the controller controls the second end of the three-way valve to communicate with the third end, that is, the three-way valve connects the second water inlet of the thermostat component with the water supply pipe, and the cold water in the water supply pipe directly enters the thermostat component and communicates with the electric The hot water from the water heater assembly is mixed and output to the first water end; when the water temperature in the outlet pipe of the gas water heater detected by the first temperature sensor is lower than the water temperature at the water outlet of the thermostat assembly minus 5°C, that is, the hot water inlet of the thermostat device When the water temperature is less than the water temperature of the water outlet of the thermostat minus 5°C, the controller controls the first end of the three-way valve to communicate with the third end, that is, the three-way valve connects the second water inlet of the thermostat component to the outlet pipe of the gas water heater. Connected, the hot water output by the gas water heater enters the thermostat and is divided into two paths, one path is directly output to the electric water heater assembly, and the other path is output to the second water inlet of the thermostat assembly after passing through the three-way valve. Finally, the hot water at the temperature required by the user is output through the constant temperature component.

That is to say, when there is cold water in the pipeline between the gas water heater and the constant temperature device, by controlling the three-way valve, most of the cold water directly enters the constant temperature component, mixes with the hot water from the electric water heater component, and at the same time makes a small part The cold water directly enters the electric water heater assembly to ensure that the water temperature in the electric water heater assembly does not drop too much or too fast, thereby effectively solving the problem of cold water in the pipeline between the gas water heater and the constant temperature device; when the gas water heater and the constant temperature device When there is hot water in the pipeline, all the hot water from the gas water heater enters the electric water heater assembly to ensure that the water temperature in the electric water heater assembly is within a reasonable range.

According to an embodiment of the present invention, the control method of the above-mentioned fuel-fired hot water system further adjusts the water intake ratio of the first water inlet and the second water inlet of the thermostatic assembly according to the water temperature at the water outlet of the thermostatic assembly.

Specifically, in order to meet user comfort requirements and ensure a constant water temperature at the water outlet of the thermostat, the controller adjusts the water inlet ratio of the first water inlet and the second water inlet of the thermostat assembly according to the water temperature at the water outlet of the thermostat assembly, so as to Continuously provide users with hot water at the desired temperature. And when there is no cold water in the water supply pipe, the controller also closes the water outlet by controlling the constant temperature device, so as to avoid scalding the user by hot water with a higher temperature.

In addition, when the gas-fired hot water system provides hot water for multiple bathrooms, a thermostat can be installed in each bathroom, and different bathrooms can be set with different outlet water temperatures. The water temperature at the water outlet of the constant temperature component in the device automatically adjusts the water inlet ratio of the first water inlet and the second water inlet of the corresponding constant temperature component to meet the requirements of different users. Among them, the user can set the outlet water temperature of the constant temperature device through the smart terminal, which is easy to operate.

According to the control method of the gas-fired hot water system in the embodiment of the present invention, the water temperature in the water outlet pipe of the gas water heater is firstly detected, and then the water temperature at the water outlet of the constant temperature component and the water temperature in the water outlet pipe of the gas water heater are obtained according to the water temperature in the water outlet pipe of the gas water heater and judge the temperature difference. If the water temperature in the outlet pipe is lower than the water temperature at the water outlet and the temperature difference is greater than the preset temperature threshold, the first end and the third end of the three-way valve are controlled. Otherwise, the second end of the control three-way valve is connected with the third end, so as to solve the problem of cold water in the pipeline through the control of the three-way valve, and continuously provide hot water with constant water temperature to the water end through the constant temperature component to meet the User comfort requirements.

Any process or method descriptions in flowcharts or otherwise described herein may be understood to represent modules, segments or portions of code comprising one or more executable instructions for implementing specific logical functions or steps of the process , and the scope of preferred embodiments of the invention includes alternative implementations in which functions may be performed out of the order shown or discussed, including substantially concurrently or in reverse order depending on the functions involved, which shall It is understood by those skilled in the art to which the embodiments of the present invention pertain.

The logic and/or steps represented in the flowcharts or otherwise described herein, for example, can be considered as a sequenced listing of executable instructions for implementing logical functions, can be embodied in any computer-readable medium, For use with instruction execution systems, devices, or devices (such as computer-based systems, systems including processors, or other systems that can fetch instructions from instruction execution systems, devices, or devices and execute instructions), or in conjunction with these instruction execution systems, devices or equipment used. For the purposes of this specification, a "computer-readable medium" may be any device that can contain, store, communicate, propagate or transmit a program for use in or in conjunction with an instruction execution system, device or device. More specific examples (non-exhaustive list) of computer-readable media include the following: electrical connection with one or more wires (electronic device), portable computer disk case (magnetic device), random access memory (RAM), Read Only Memory (ROM), Erasable and Editable Read Only Memory (EPROM or Flash Memory), Fiber Optic Devices, and Portable Compact Disc Read Only Memory (CDROM). In addition, the computer-readable medium may even be paper or other suitable medium on which the program can be printed, since the program can be read, for example, by optically scanning the paper or other medium, followed by editing, interpretation or other suitable processing if necessary. The program is processed electronically and stored in computer memory.

It should be understood that various parts of the present invention can be realized by hardware, software, firmware or their combination. In the embodiments described above, various steps or methods may be implemented by software or firmware stored in memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, it can be implemented by any one or combination of the following techniques known in the art: Discrete logic circuits, ASICs with suitable combinational logic gates, programmable gate arrays (PGAs), field programmable gate arrays (FPGAs), etc.

Those of ordinary skill in the art can understand that all or part of the steps carried by the methods of the above embodiments can be completed by instructing related hardware through a program, and the program can be stored in a computer-readable storage medium. During execution, one or a combination of the steps of the method embodiments is included.

In addition, each functional unit in each embodiment of the present invention may be integrated into one processing module, each unit may exist separately physically, or two or more units may be integrated into one module. The above-mentioned integrated modules can be implemented in the form of hardware or in the form of software function modules. If the integrated modules are realized in the form of software function modules and sold or used as independent products, they can also be stored in a computer-readable storage medium.

The storage medium mentioned above may be a read-only memory, a magnetic disk or an optical disk, and the like.

In the description of this specification, descriptions referring to the terms "one embodiment", "some embodiments", "example", "specific examples", or "some examples" mean that specific features described in connection with the embodiment or example , structure, material or characteristic is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

Although the embodiments of the present invention have been shown and described, those skilled in the art can understand that various changes, modifications and substitutions can be made to these embodiments without departing from the principle and spirit of the present invention. and modifications, the scope of the invention is defined by the appended claims and their equivalents.

Claims (9)

1. A fuel-fired hot water system, characterized in that it comprises: A gas water heater, the water inlet pipe of the gas water heater is connected to the water supply pipe; A constant temperature device, the constant temperature device includes an electric water heater assembly, a constant temperature assembly and a three-way valve, the water inlet of the electric water heater assembly is connected to the water outlet pipe of the gas water heater, and the water outlet of the electric water heater assembly is connected to the constant temperature The first water inlet of the component, the first end of the three-way valve is connected to the outlet pipe of the gas water heater, the second end of the three-way valve is connected to the water supply pipe, and the third end of the three-way valve The end is connected to the second water inlet of the thermostat assembly, and the water outlet of the thermostat assembly is connected to the first water use port; a first temperature sensor, the first temperature sensor is used to detect the water temperature in the outlet pipe of the gas water heater; and A controller, the controller is respectively connected with the first temperature sensor and the three-way valve, and the controller is used to obtain the difference between the water temperature at the water outlet of the thermostatic assembly and the water temperature in the water outlet pipe of the gas water heater. The temperature difference between, where, When the water temperature in the water outlet pipe is lower than the water temperature at the water outlet and the temperature difference is greater than a preset temperature threshold, the controller controls the first end of the three-way valve to communicate with the third end; otherwise , the controller controls the second end of the three-way valve to communicate with the third end. 2. The fuel-fired hot water system according to claim 1, wherein the controller also adjusts the temperature of the first water inlet and the second water inlet of the thermostatic assembly according to the water temperature at the water outlet of the thermostatic assembly. Influent ratio. 3. The fuel-fired hot water system according to claim 1 or 2, wherein the thermostatic component is an electronic thermostatic valve. 4. The fuel-fired hot water system according to claim 1, wherein a check valve is further arranged on the water supply pipe. 5. The gas-fired hot water system according to claim 1, characterized in that, the outlet pipe of the gas water heater is also connected to a second water end. 6. The fuel-fired hot water system according to claim 1, wherein the preset temperature threshold is 4-6°C. 7. A control method for a gas-fired hot water system, characterized in that the gas-fired water heater system includes a gas water heater and a constant temperature device, the water inlet pipe of the gas water heater is connected to a water supply pipe, and the temperature constant device includes an electric water heater assembly, A thermostatic assembly and a three-way valve, the water inlet of the electric water heater assembly is connected to the outlet pipe of the gas water heater, the water outlet of the electric water heater assembly is connected to the first water inlet of the thermostatic assembly, and the three-way valve The first end of the three-way valve is connected to the water outlet pipe of the gas water heater, the second end of the three-way valve is connected to the water supply pipe, and the third end of the three-way valve is connected to the second water inlet of the thermostat assembly , the water outlet of the thermostatic component is connected to the first water end, and the control method includes the following steps: Detecting the water temperature in the outlet pipe of the gas water heater; Obtaining the temperature difference between the water temperature at the water outlet of the thermostatic assembly and the water temperature in the water outlet pipe of the gas water heater according to the water temperature in the water outlet pipe of the gas water heater, and judging the temperature difference; If the water temperature in the water outlet pipe is lower than the water temperature at the water outlet and the temperature difference is greater than a preset temperature threshold, control the first end of the three-way valve to communicate with the third end; If the water temperature in the water outlet pipe is greater than or equal to the water temperature at the water outlet, or the water temperature in the water outlet pipe is lower than the water temperature at the water outlet and the temperature difference is less than or equal to the preset temperature threshold, Then the second end of the three-way valve is controlled to communicate with the third end. 8. The control method of the fuel-fired hot water system according to claim 7, characterized in that the water inlet between the first water inlet and the second water inlet of the thermostatic assembly is also adjusted according to the water temperature at the water outlet of the thermostatic assembly. water ratio. 9. The control method of the fuel-fired hot water system according to claim 7 or 8, characterized in that the preset temperature threshold is 4-6°C.