Hot water supply system with zero cold water function and control method thereof

Abstract

The invention discloses a hot water supply system with a zero cold water function and a control method thereof. The hot water supply system with the zero cold water function comprises a gas water heater, a plurality of water terminals and a water return controller, the gas water heater is provided with a water inlet pipe, a water outlet pipe and a zero cold water pipe, the water return controller comprises a mounting shell, a three-way valve, an electric control board and a power supply module, and the three-way valve is provided with a water inlet valve port, a first water outlet valve port and a second water outlet valve port. The water inlet valve port is selectively communicated with the first water outlet valve port or the second water outlet valve port; the three-way valve is arranged in the mounting shell; the electric control board is provided with a wireless communication module, the wireless communication module is configured to be in wireless communication with the zero cold water heater, and the electric control board is arranged in the mounting space and connected with the three-way valve; the power supply module is arranged on the mounting shell and is configured to supply power to the electric control board and the three-way valve; and the wireless communication module is in communication connection with the gas water heater. Energy consumption is reduced, and the user experience of the zero-cold-water gas water heater is improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of household appliances, and particularly relates to a hot water supply system with zero cold water function and its control method. Background Art

[0002] At present, water heaters are common household appliances in people's daily lives. Water heaters are divided into types such as gas water heaters and electric water heaters. Among them, gas water heaters are widely used because of their convenient use. A conventional gas water heater usually consists of components such as a burner, a combustion chamber, and a heat exchanger. The burner burns gas in the combustion chamber to heat the water flowing through the heat exchanger.

[0003] In the prior art, gas water heaters with zero cold water function are widely promoted and used. During the use of zero cold water gas water heaters, after starting the zero cold water mode, it is necessary to heat the whole-house pipeline to meet the circulating heating of the water in the indoor pipeline.

[0004] However, in actual use, usually users only need zero cold water treatment at one hot water usage point, and the circulating water pipes connected to other hot water usage points do not need zero cold water heating. Since the gas water heater will perform zero cold water heating on the overall circulating water circuit in the house after starting the zero cold water mode, on the one hand, it leads to a longer zero cold water heating time, and on the other hand, it also results in higher energy consumption. In view of this, how to design a technology that reduces energy consumption and improves the zero cold water heating efficiency to improve the user experience is the technical problem to be solved by the present invention. Summary of the Invention

[0005] The present invention provides a hot water supply system with zero cold water function and its control method, which realizes reducing energy consumption and improving the user experience of zero cold water gas water heaters.

[0006] To achieve the above technical purpose, the present invention is realized by adopting the following technical solutions: In one aspect, the present invention provides a hot water supply system with zero cold water function, including: A gas water heater, the gas water heater is configured with a water inlet pipe, a water outlet pipe, and a zero cold water pipe. The water outlet pipe is connected to an external hot water supply pipe, and the zero cold water pipe is connected to an external return pipe; Multiple water usage terminals; Return water controller, the return water controller includes: an installation shell, a three-way valve, an electronic control board and a power supply module. The three-way valve has a water inlet valve port, a first water outlet valve port and a second water outlet valve port. The water inlet valve port is selectively connected to the first water outlet valve port or the second water outlet valve port. The three-way valve is arranged in the installation shell. The electronic control board has a wireless communication module, and the wireless communication module is configured to wirelessly communicate with a zero cold water heater. The electronic control board is arranged in the installation space and connected to the three-way valve. The power supply module is arranged on the installation shell and configured to supply power to the electronic control board and the three-way valve. Wherein, the water inlet valve port is connected to the hot water supply pipe, the first water outlet valve port of the return water is connected to the corresponding water using terminal, the second water outlet valve port is connected to the return water pipe, and the wireless communication module is communicatively connected to the gas water heater.

[0007] In an embodiment of the present application, the power supply module is a power supply cable, and the power supply cable is connected to the electronic control board and extends out of the installation shell.

[0008] In an embodiment of the present application, the power supply module is a battery mounting rack, and the battery mounting rack is configured to mount a storage battery, and the battery mounting rack is arranged in the installation space.

[0009] In an embodiment of the present application, the gas water heater includes a housing and a burner, a heat exchanger, an internal circulation module, an electric heating module and a controller arranged in the housing. The housing is provided with the water inlet pipe, the water outlet pipe and the zero cold water pipe. The internal circulation module includes a circulation pump, a first water storage container and a bypass pipe. The first water storage container is connected between the circulation pump and the bypass pipe to form an internal flow path. The electric heating module includes an electric heating component and a second water storage container, and the electric heating component is configured to electrically heat the water in the second water storage container. The internal flow path is connected to the heat exchanger to form an internal circulation flow path, and the second water storage container is connected between the heat exchanger and the water outlet pipe. The controller is configured to control the operation of the circulation pump and the electric heating component, and the wireless communication module is communicatively connected to the controller.

[0010] In an embodiment of the present application, the circulation pump, the first water storage container and the bypass pipe are connected in sequence, and the circulation pump is connected to the water inlet end of the heat exchanger. A first electric control valve is arranged on the bypass pipe, and the first electric control valve is configured to control the on-off of the bypass pipe.

[0011] In an embodiment of the present application, a four-way pipe is arranged on the first water storage container. A second electric control valve is arranged on the zero cold water pipe, and the second electric control valve is configured to control the on-off of the zero cold water pipe. The four-way pipe is respectively connected to the bypass pipe, the water inlet pipe and the zero cold water pipe.

[0012] In another aspect, another embodiment of the present application further provides a control method for the hot water supply system with zero cold water function as described above, including: zero cold water mode; When the zero cold water mode is executed, the return water controller connected to the water using terminal in the use state receives the control signal sent by the gas water heater, and the return water controller switches the three-way valve to conduct the hot water supply pipe and the return water pipe connected to the water using terminal, and the water in the hot water supply pipe and the return water pipe between the water using terminal and the gas water heater circulates into the gas water heater for heating until the first set temperature value T1 is reached.

[0013] In an embodiment of the present application, when the zero cold water mode is executed, the bypass pipe is closed and the circulation pump and the electric heating component are started. The water input from the zero cold water pipe sequentially passes through the first water storage tank, the heat exchanger and the second water storage tank and is output from the water outlet pipe to the external circulation pipeline. The electric heating module heats the water flowing through the second water storage tank until the water temperature at the outlet of the first water storage tank reaches the first set temperature value T1.

[0014] In an embodiment of the present application, the control method further includes: During the normal water use process after the execution of the zero cold water mode, after the water use is paused, the bypass pipe is opened and the circulation pump is started, so that the water circulates between the heat exchanger and the first water storage tank until the water temperature at the outlet of the first water storage tank reaches the second set temperature value T2.

[0015] In an embodiment of the present application, opening the bypass pipe and starting the circulation pump specifically means: when the circulation pump starts to run for a duration exceeding the second set time t2 and the water temperature at the outlet of the first water storage tank has not reached the second set temperature value T2, the burner is started until the water temperature at the outlet of the first water storage tank reaches the third set temperature value T3, and then, the burner is shut down and the circulation pump continues to run until the water temperature at the outlet of the first water storage tank reaches the second set temperature value T2; Wherein, T2>T3.

[0016] In an embodiment of the present application, the control method further includes The first water use mode and the second water use mode; In the first water use mode, after the water use is started, the electric heating module is powered on and started to heat the water in the second water storage container for instant hot water supply. At this time, the burner is not started; In the second water use mode, after the water use is started, the burner is started to heat the water flowing in the heat exchanger.

[0017] By configuring the electronic control board to control the connection state of the three-way valve, the return water controller is installed on the corresponding water-using terminal and connected between the external hot water supply pipe and the return water pipe. During use, when the gas water heater operates in the zero-cold water mode, for the return water controller connected to the water-using terminal in the use state, the connection state can be switched when the gas water heater starts the zero-cold water mode, so that the pipeline where the water-using terminal is located participates in the zero-cold water circulation heating. In this way, it is not necessary to heat all the hot water supply pipes in the user's home. On the one hand, the zero-cold water heating time can be shortened. On the other hand, since it is not necessary to heat the water in all the hot water supply pipes, the energy consumption can be effectively reduced, and the user experience is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0019] Figure 1 One of the structural schematic diagrams of an embodiment of the zero-cold water gas water heater of the present invention; Figure 2 Another structural schematic diagram of an embodiment of the zero-cold water gas water heater of the present invention; Figure 3 One of the structural schematic diagrams of an embodiment of the zero-cold water gas water heater of the present invention; Figure 4 Another structural schematic diagram of an embodiment of the zero-cold water gas water heater of the present invention; Figure 5 For Figure 3 The structural schematic diagram of the first water storage container in Figure 6 For Figure 3 The sectional view of the first water storage container in Figure 7 For Figure 3 The structural schematic diagram of the second water storage container in Figure 8 For Figure 3 The sectional view of the second water storage container in Figure 9 For Figure 3 The exploded view of the second water storage container in Figure 10 For Figure 9 The assembly drawing of the electric heating component in Figure 11 The structural schematic diagram of an embodiment of the hot water supply system with zero-cold water function of the present invention; Figure 12 is Figure 11 a schematic structural diagram of the middle return water controller; Figure 13 is Figure 12 an exploded view of the middle return water controller; Figure 14 is Figure 13 a schematic structural diagram of the first housing.

[0020] Explanation of reference numerals: 1. Outer shell; 11. Water inlet pipe; 12. Water outlet pipe; 13. Zero cold water pipe; 14. Servo proportional valve; 15. Gas inlet pipe; 16. Second electric control valve; 2. Combustion chamber; 3. Heat exchanger; 4. Inner circulation module; 41. Circulation pump; 42. First water storage container; 43. Bypass pipe; 44. First electric control valve; 45. Four-way pipe; 46. Check valve; 421. Connecting pipe one; 422. Connecting pipe two; 5. Electric heating module; 51. Electric heating component; 52. Second water storage container; 511. Straight pipe section; 512. Spiral section; 521. First connecting pipe; 522. Second connecting pipe; 100. Gas water heater; 200. Water using terminal; 300. Return water controller; 310. Installation shell; 311. First housing; 312. Second housing; 3111. First mounting seat; 31112. First housing; 3113. Clamping part; 31114. Insertion part; 3121. Second mounting seat; 3122. Second housing; 3123. Clamping mating part; 3124. Insertion mating part; 320. Three-way valve; 321. Water inlet valve port; 322. First water outlet valve port; 323. Second water outlet valve port; 330. Electric control board; 331. Wireless communication module; 340. Power supply module; 400. Hot water supply pipe; 300. Return water pipe. Specific embodiments

[0021] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Apparently, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0022] It should be noted that in the description of the present invention, the terms indicating directions or positional relationships such as "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings. This is only for convenience of description and does not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0023] In the present invention, unless otherwise clearly specified and defined, the terms such as "installation", "connection", "connection", "fixation", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0024] In the present invention, unless otherwise clearly specified and defined, the first feature being "above" or "below" the second feature may include the direct contact between the first and second features, or may include the situation where the first and second features are not in direct contact but in contact through other features between them. Moreover, the first feature being "above", "over", and "on" the second feature includes that the first feature is directly above and obliquely above the second feature, or merely indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature being "below", "under", and "beneath" the second feature includes that the first feature is directly below and obliquely below the second feature, or merely indicates that the horizontal height of the first feature is lower than that of the second feature.

[0025] 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, the components and settings of specific examples are described below. Of course, they are only examples and are not intended to limit the present invention. In addition, the present invention may repeat reference numerals and / or reference letters in different examples. This repetition is for the purpose of simplification and clarity, and does not itself indicate the relationship between the various embodiments and / or settings discussed. In addition, the present invention provides examples of various specific processes and materials, but those of ordinary skill in the art can be aware of the application of other processes and / or the use of other materials.

[0026] A gas water heater uses gas as the main energy material, and transfers the high-temperature heat generated by gas combustion to the cold water flowing through the heat exchanger to achieve the purpose of preparing hot water.

[0027] A gas water heater generally includes a housing, and components such as a burner, a heat exchanger, a blower, and a wind cover provided inside the housing.

[0028] Among them, gas is transported to the burner, and the gas is ignited by an ignition device so that the burner burns the transported gas, thereby generating heat.

[0029] The heat exchanger is provided with heat exchange tubes. One end of the heat exchange tube is communicated with the water supply pipeline, and the other end of the heat exchange tube is communicated with a shower head or a faucet, etc.

[0030] The heat generated by the burner burning gas is used to heat the heat exchange tubes, so that the water temperature in the heat exchange tubes rises to form hot water.

[0031] When the gas water heater is working, the cold water provided by the water supply pipeline flows into the heat exchange tubes, and then is heated by the heat source generated by the burner into hot water, and then flows out from the shower head or faucet through the hot water valve for users to use.

[0032] At the same time, during the operation of the gas water heater, the blower is powered on and operates simultaneously. Under the action of the blower, the flue gas generated by the burner is discharged to the outside.

[0033] Since the heat generated by the burner burning gas during the working process will be conducted to the housing, in order to reduce heat transfer.

[0034] Embodiment 1, such as Figures 11 - 14As shown in the figure, an embodiment of the present application provides a hot water supply system with zero cold water function, which includes a gas water heater 100 and multiple water use terminals 200. The water outlet pipe of the gas water heater 100 and the zero cold water pipe, the water outlet pipe is connected to the external hot water supply pipe 400, and the zero cold water pipe is connected to the external return water pipe 300. The hot water output by the gas water heater 100 is transported to each water use terminal 200 through the hot water supply pipe 400. And when the gas water heater 100 executes the zero cold water mode, the water in the hot water supply pipe 400 can flow back to the gas water heater 100 through the return water pipe 300 for circulating heating.

[0035] Among them, in order to reduce the heating duration and energy consumption in the zero cold water mode, the hot water supply system with zero cold water function further includes a return water controller 300.

[0036] The return water controller 300 includes: An installation shell 310, in which an installation space is formed; A three-way valve 320, which has an inlet valve port 321, a first outlet valve port 322 and a second outlet valve port 323. The inlet valve port 321 is selectively communicated with the first outlet valve port 322 or the second outlet valve port 323; the three-way valve 320 is arranged in the installation space, and the inlet valve port 321, the first outlet valve port 322 and the second outlet valve port 323 extend to the outside of the installation shell 310; An electronic control board 330, which has a wireless communication module 331, and the wireless communication module 331 is configured to communicate with the zero cold water water heater wirelessly; the electronic control board 330 is arranged in the installation space and is connected to the three-way valve 320; A power supply module 340, which is arranged on the installation shell 310 and is configured to supply power to the electronic control board 330 and the three-way valve 320.

[0037] Specifically, in actual use and connection, the water use terminal 200 is configured with a corresponding return water controller 300. The inlet valve port 321 of the return water controller 300 is connected to the hot water supply pipe 400, the first outlet valve port 322 of the return water controller 300 is connected to the corresponding water use terminal 200, and the second outlet valve port 323 of the return water controller 300 is connected to the return water pipe 300; the return water controller 300 is communicatively connected to the gas water heater 100.

[0038] For the return water controller 300, it is connected between the hot water supply pipe 400 and the return water pipe 300, and through the return water controller 300, it realizes the control that the part of the hot water supply pipe 400 and the part of the return water pipe 300 connected to the water use terminal 200 at the corresponding position participate in zero cold water heating.

[0039] During the specific usage process, after the gas water heater 100 starts the zero - cold - water mode, the return water controller 300 at the water - using terminal 200 in the usage state will receive a control signal sent by the gas water heater 100. After the electronic control board 330 receives the signal through the wireless communication module 331, it controls the three - way valve 320 to switch the connected state, so that the water inlet valve port 321 is connected to the second water outlet valve port 323. In this way, a part of the hot - water supply pipe 400 and a part of the return water pipe 300 connected to the water - using terminal 200 will participate in the zero - cold - water heating process.

[0040] By configuring the electronic control board 330 to control the connected state of the three - way valve 320, the return water controller 300 is installed on the corresponding water - using terminal 200 and connected between the external hot - water supply pipe 400 and the return water pipe 300. During the usage process, when the gas water heater 100 executes the zero - cold - water mode, the return water controller 300 connected to the water - using terminal 200 in the usage state can switch the connected state when the gas water heater 100 starts the zero - cold - water mode, so that the pipeline where the water - using terminal 200 is located participates in the zero - cold - water circulating heating. In this way, it is not necessary to heat all the hot - water supply pipes 400 in the user's home. On the one hand, the duration of zero - cold - water heating can be shortened. On the other hand, since it is not necessary to heat the water in all the hot - water supply pipes 400, the energy consumption can be effectively reduced, improving the user experience.

[0041] In one embodiment, the power supply module 340 is a power supply cable, and the power supply cable is connected to the electronic control board 330 and extends outside the installation shell 310. Or, for the convenience of power supply, the power supply module 340 is a battery mounting rack, and the battery mounting rack is configured to mount a storage battery, and the battery mounting rack is arranged in the installation space.

[0042] Specifically, when using a power supply cable as the power supply module 340, the power supply cable is connected to an electrical socket in the user's home to achieve power supply. And for more convenient power supply, the way of using a storage battery for power supply can also be adopted. At this time, the battery mounting rack for mounting the storage battery constitutes the power supply module 340.

[0043] In one embodiment, the installation shell 310 includes a first shell 311 and a second shell 312, the first shell 311 and the second shell 312 are detachably connected together, the three - way valve 320 and the electronic control board 330 are arranged in the first shell 311, and the battery mounting rack is arranged in the second shell 312.

[0044] Specifically, the installation shell 310 adopts a split design. The first shell 311 is used to install the electronic control board 330 and the three-way valve 320, and the three-way valve 320 cannot be disassembled after being assembled onto the hot water supply pipe 400 and the return water pipe 300. The second shell 312 is used to place the battery mounting bracket. When the user replaces the storage battery, the second shell 312 can be disassembled from the first shell 311 to facilitate the replacement of the storage battery.

[0045] In some embodiments, the first shell 311 and the second shell 312 are snap-fitted together.

[0046] Specifically, the first shell 311 is provided with a clamping portion 3113 and a plugging portion 31114, the second shell 312 is provided with a clamping mating portion 3123 and a plugging mating portion 3124. The plugging portion 31114 and the plugging mating portion 3124 are inserted together, and the clamping portion 3113 and the clamping mating portion 3123 are snap-fitted together.

[0047] In another embodiment, to facilitate the operator's assembly, the first shell 311 includes a first mounting seat 3111 and a first cover 31112, and the first cover 31112 is detachably arranged on the first mounting seat 3111; a slot is also provided on the first mounting seat 3111, and the electronic control board 330 is inserted into the slot; the three-way valve 320 is provided with a positioning hole and a fixing hole, and the first mounting seat 3111 is also provided with a positioning post and a fixing post. The positioning post is inserted into the positioning hole, and a screw passes through the fixing hole and is threadedly connected to the fixing post.

[0048] Specifically, for the first shell 311 assembled with the detachable first mounting seat 3111 and the first cover 31112, during assembly, the operator assembles the three-way valve 320 and the electronic control board 330 onto the first mounting seat 3111, and then, shields and protects them through the first cover 31112.

[0049] In another embodiment, the second shell 312 includes a second mounting seat 3121 and a second cover 3122, and the second cover 3122 is detachably arranged on the second mounting seat 3121; the battery mounting bracket is arranged on the second mounting seat 3121.

[0050] Specifically, when the user replaces the storage battery, the second shell 312 is disassembled from the first shell 311, and then, the second cover 3122 is disassembled from the second mounting seat 3121, and the storage battery on the battery mounting bracket can be replaced.

[0051] In some embodiments, since the first housing 311 and the second housing 312 are of a split structure, in order to facilitate power supply to the electronic control board 330 and the three-way valve 320 by means of a storage battery, a power supply line is provided between the first housing 311 and the second housing 312, and the electronic control board 330 is electrically connected to the power supply module 340 through the power supply line; alternatively, a first electrical contact is provided on the first housing 311, and a second electrical contact is provided on the second housing 312; after the first housing 311 and the second housing 312 are connected together, the first electrical contact and the second electrical contact are in conductive contact, and the electronic control board 330 is electrically connected to the power supply module 340 through the first electrical contact and the second electrical contact.

[0052] Based on the above technical solution, optionally, in the actual operation process of the hot water supply system with the zero cold water function, the specific control method includes: the zero cold water mode; When the zero cold water mode is executed, the return water controller 300 connected to the water using terminal 200 in the use state receives a control signal sent by the gas water heater 100, and the return water controller 300 switches the three-way valve 320 to conduct the hot water supply pipe 400 and the return water pipe 300 connected to the water using terminal 200, and the water in the hot water supply pipe 400 and the return water pipe 300 between the water using terminal 200 and the gas water heater 100 circulates into the gas water heater 100 for heating until the first set temperature value T1 is reached.

[0053] Specifically, after the gas water heater 100 starts the zero cold water mode, the return water controller 300 at the corresponding position receives a trigger signal, and then controls the internal three-way valve 320 to switch the connected state so that the water inlet valve port 321 is communicated with the water outlet valve port. And the return water controller 300 at the water using terminal 200 in other non-use states does not perform the operation of switching the connection state of the three-way valve 320. In this way, the zero cold water heating treatment can be performed only on the hot water supply pipe 400 and the return water pipe 300 between the water using terminal 200 in the use state and the gas water heater 100.

[0054] Embodiment 2, as Figures 1 - 8 shown, this embodiment provides a gas water heater, which includes a housing 1 and a combustion chamber 2, a burner and a heat exchanger 3 provided in the housing 1. An inlet water pipe 11, an outlet water pipe 12 and a zero cold water pipe 13 are provided on the housing 1.

[0055] Among them, in order to meet the requirement of reducing the temperature rise of the secondary boiling water to improve the constancy of the outlet water temperature, the gas water heater is configured with an internal circulation module 4. The internal circulation module 4 includes a circulation pump 41, a first water storage container 42 and a bypass pipe 43. The first water storage container 42 is connected between the circulation pump 41 and the bypass pipe 43 to form an internal flow path, and the internal flow path is connected to the heat exchanger 3 to form an internal circulation flow path.

[0056] Specifically, during the user's water usage, when the water supply is briefly turned off, the water in the heat exchanger 3 will be heated by the residual heat in the combustion chamber 2. Then, the circulation pump 41 can be started to make the cold water in the first water storage container 42 circulate into the heat exchanger 3 to absorb the residual heat, so as to meet the requirement that the temperature fluctuation of the hot water when the water supply is turned on next time is small.

[0057] In addition, in order to reduce the number of ignition starts of the burner according to the water usage demand during use, so as to reduce energy consumption and noise, the gas water heater is configured with an electric heating module 5. The electric heating module 5 includes an electric heating component 51 and a second water storage container 52. The electric heating component 51 is arranged on the second water storage container 52 and is configured to electrically heat the water in the second water storage container 52. The second water storage container 52 is connected between the heat exchanger 3 and the water outlet pipe 12.

[0058] Specifically, during use, when the user needs a large amount of hot water such as during bathing, the gas water heater normally starts to burn gas through the burner to heat the water flowing through the heat exchanger 3. When the user uses water in the kitchen and needs a small amount of hot water, on the one hand, the hot water flow rate is small, and on the other hand, the user frequently turns on and off the hot water. At this time, the electric heating module 5 can be started to heat the water in the second water storage container 52 to meet the requirement of instant hot water supply.

[0059] During this process, the burner in the gas water heater does not start, and only the heat generated by the electric heating component 51 in the electric heating module 5 being energized and heated is used to heat the water in the second water storage container 52. The heat generated by the electric heating component 51 in the electric heating module 5 meets the requirement of instant heating with a small water flow rate.

[0060] Among them, in order to meet the requirement of flow limiting control, usually, a servo proportional valve 14 is connected in series in the flow path between the water inlet pipe 11 and the heat exchanger 3, and the servo proportional valve 14 is used to automatically adjust the water inlet flow rate of the gas heat exchanger 3.

[0061] And, in the actual control process of the gas water heater, a trigger component can be configured on the gas water heater to trigger the start of the electric heating module 5 to realize instant hot water supply. During the user's use, when the trigger component is triggered, the electric heating module 5 starts to execute water heating. In this way, after the user turns on the faucet, the electric heating module 5 starts the instant hot water supply mode, and, in the instant hot water supply mode, the water inlet amount is controlled by the servo proportional valve 14.

[0062] Among them, the trigger component can be a changeover switch arranged on the gas water heater, or other components that can trigger the gas water heater to switch modes, and no restrictions and elaborations are made here.

[0063] For the adjustment of the water inlet volume by the servo proportional valve 14, it is generally servo-adjusted according to the outlet water temperature detected by the temperature sensor configured on the outlet pipe 12. For example, when the outlet water temperature of the outlet pipe 12 is higher than the set outlet water temperature, the servo proportional valve 14 increases the water inlet flow rate; conversely, when the outlet water temperature of the outlet pipe 12 is lower than the set outlet water temperature, the servo proportional valve 14 decreases the water inlet flow rate. Regarding the specific control program, no limitation and elaboration are made here.

[0064] By configuring the internal circulation module 4 and the electric heating module 5, the first water storage container 42 configured in the internal circulation module 4 can meet the requirements of internal circulation when water use is paused. In addition, during use, for the electric heating module 5 configured on the outlet pipe 12, the electric heating component 51 can be used to perform instant heating treatment on the water in the second water storage container 52. In this way, in scenarios with relatively small water consumption such as in the kitchen, only the electric heating module 5 needs to be started to supply hot water without frequently starting the burner. On the one hand, it can effectively reduce the large gas consumption caused by frequent starts. On the other hand, since the electric heating component 51 is used to heat the water in the second water storage container 52, silent heating can be achieved to reduce the large noise generated by frequent starts of the burner, thereby reducing energy consumption and noise impact and improving the user experience.

[0065] In an embodiment of the present application, for the installation positions of the relevant components in the housing 1, in order to meet the design requirements of structural compactness and meet the design requirements of the flow path, the following structural design is carried out for the installation positions of the first water storage container 42 and the second water storage container 52.

[0066] The first water storage container 42 is arranged on one side inside the housing 1 and above the water inlet pipe 11, and the second water storage container 52 is arranged on the other side inside the housing 1 and above the outlet pipe 12.

[0067] Specifically, the first water storage container 42 and the second water storage container 52 are arranged below the combustion chamber 2 and make full use of the space on both sides below the combustion chamber 2 in the housing 1 to place the first water storage container 42 and the second water storage container 52. Among them, the first water storage container 42 is adjacent to the water inlet pipe 11 and above the water inlet pipe 11, which is convenient for connecting the water inlet pipe 11 to the first water storage container 42, and realizing the water path connection between the water inlet pipe 11 and the heat exchanger 3 through the first water storage container 42.

[0068] In addition, for the second water storage container 52, it is arranged on the other side inside the housing 1 and above the outlet pipe 12. In this way, the outlet pipe 12 can be directly connected to the second water storage container 52 above to facilitate the connection of the pipeline and shorten the length of the water flow path of the water outlet from the second water storage container 52.

[0069] Meanwhile, in order to meet the requirements of gas supply, a gas inlet pipe 15 is also arranged on the outer shell 1 of the gas water heater. The gas inlet pipe 15 is used to supply gas to the burner in the combustion chamber 2 for combustion. In order to facilitate the routing of the gas supply pipeline in the outer shell 1, the gas inlet pipe 15 is arranged at a position between the first water storage container 42 and the second water storage container 52, so that the gas inlet pipe 15 can arrange the gas path through the space between the first water storage container 42 and the second water storage container 52.

[0070] Specifically, the first water storage container 42 is arranged on one side of the gas inlet pipe 15, the second water storage container 52 is arranged on the other side of the gas inlet pipe 15, and the gas inlet pipe 15 is located between the first water storage container 42 and the second water storage container 52.

[0071] In another embodiment of the present application, a first connecting pipe 521 and a second connecting pipe 522 are arranged on the second water storage container 52. The water outlet of the first connecting pipe 521 is arranged at the bottom of the second water storage container 52, and the water inlet of the second connecting pipe 522 is arranged at the top of the second water storage container 52.

[0072] Specifically, in order to improve the constant temperature property and hot water output rate of the water temperature output by the second water storage container 52, the water entering the second water storage container 52 is conveyed to the bottom of the second water storage container 52 through the first connecting pipe 521. After the water output from the first connecting pipe 521 flows into the bottom of the second water storage container 52, the water at the bottom can be heated from the bottom of the second water storage container 52, and by using the principle of hot water rising, the water in the second water storage container 52 can be heated evenly.

[0073] Meanwhile, by arranging the water outlet of the first connecting pipe 521 at the bottom of the second water storage container 52, during the process of heating the water in the heat exchanger 3 by the burner to input hot water into the second water storage container 52 through the first connecting pipe 521. Since there is a certain amount of water stored in the second water storage container 52, in this way, even if the water temperature output by the heat exchanger 3 fluctuates, the water flowing into the second water storage container 52 through the first connecting pipe 521 can be mixed with the water already stored in the second water storage container 52, so as to effectively reduce the fluctuation range of the water temperature of the water outlet pipe 12 and improve the user experience.

[0074] In another embodiment of the present application, a first installation hole and a second installation hole are arranged at the top of the second water storage container 52. The first connecting pipe 521 is inserted into the first installation hole, and the lower end of the first connecting pipe 521 extends to the bottom of the second water storage container 52; the water inlet of the second connecting pipe 522 is connected to the second installation hole.

[0075] Specifically, to facilitate the installation of the first connecting pipe 521 and the second connecting pipe 522, an installation hole is provided on the second water storage container 52 to meet the installation requirements of the connecting pipes. Among them, for the first connecting pipe 521, a first installation hole is provided at the top of the second water storage container 52, and the lower end of the first connecting pipe 521 is inserted into the first installation hole and extends to the bottom of the second water storage container 52. In this way, the upper end of the first connecting pipe 521 is exposed at the top of the second water storage container 52 to facilitate the connection of the pipeline with the heat exchanger 3 at the top. The second connecting pipe 522 is connected to the second installation hole at the top to meet the requirement of discharging the water in the second water storage container 52 from the top.

[0076] In another embodiment, in order to improve the electric heating efficiency of the electric heating component to meet the heating requirement of increasing the water flow rate, the electric heating component includes a first electric heating pipe 511 and a second electric heating pipe 512. The first electric heating pipe and the second electric heating pipe are in a spiral structure, and the first electric heating pipe is sleeved outside the second electric heating pipe; Among them, the first electric heating pipe and the second electric heating pipe are arranged in the water storage container, and the wiring terminals of the first electric heating pipe and the wiring terminals of the second electric heating pipe extend outside the water storage container.

[0077] Specifically, two electric heating pipes in a spiral structure are assembled into an electric heating component 51. The electric heating pipes are in a spiral structure to increase their contact area with water. At the same time, the first electric heating pipe 511 is sleeved outside the second electric heating pipe 512 to meet the requirement of the overall compact design of the electric heating component, and then it can be installed into the water storage container 52.

[0078] Among them, in order to improve the safety and reliability, a protective cover 524 is also provided on the second water storage container 52, and the protective cover covers the wiring terminals of the first electric heating pipe 511 and the wiring terminals of the second electric heating pipe 512.

[0079] In some embodiments, the first electric heating pipe includes two first straight pipe segments 5112 and a first spiral segment 5111, and the first spiral segment is connected between the two first straight pipe segments; The second electric heating pipe includes two second straight pipe segments 5122 and a second spiral segment 5121, and the second spiral segment is connected between the two second straight pipe segments; Among them, the first spiral segment is sleeved outside the second spiral segment, the first spiral segment and the second spiral segment are located inside the second water storage container, and the first straight pipe segment and the second straight pipe segment extend outside the second water storage container and are respectively provided with wiring terminals.

[0080] Specifically, taking the first electric heating tube 511 as an example, the first spiral section 5111 is in a spiral structure to play the main heating role, while the first straight tube section 5112 plays the functions of support and circuit connection.

[0081] In order to achieve a compact structure design, one of the straight tube sections passes through the space formed by surrounding the second spiral section.

[0082] In another embodiment, the second spiral section and the first spiral tube section are arranged in a staggered manner, and a turbulent flow channel is formed between the second spiral section and the first spiral tube section.

[0083] Specifically, the water in the second water storage container is input through the first connecting pipe and output from the second connecting pipe. In order to ensure that the water input from the first connecting pipe can be fully and evenly heated by the electric heating component 51 to improve the hot water output rate, the second spiral section 5121 in the space surrounded by the first spiral tube section 5111 is arranged in a staggered manner. Assuming the water flows along the central line direction of the second water storage container from the first connecting pipe to the second connecting pipe direction, the projections of the first spiral tube section 5111 and the second spiral section 5121 perpendicular to the central line direction of the second water storage container are arranged alternately.

[0084] In this way, during the process of the water flowing through the first spiral tube section 5111 and the second spiral section 5121, the water flow will be alternately blocked by the first spiral tube section 5111 and the second spiral section 5121, playing the role of turbulent flow, so that the water in the second water storage container 52 can be fully mixed and heated evenly, thereby improving the hot water output rate to meet the requirement of increasing the instant heating water flow rate.

[0085] In order to achieve sufficient heating uniformity, the second spiral section and the first spiral tube section are located between the water outlet of the first connecting pipe and the water inlet of the second connecting pipe.

[0086] In some embodiments, a switchable sewage discharge pipe 523 is further provided at the bottom of the second water storage container, and the sewage discharge pipe 523 extends to the outside of the housing 1.

[0087] Specifically, by configuring the sewage discharge pipe 523 at the bottom of the second water storage container 52, after the water heater is used for a long time, dirt is likely to accumulate at the bottom of the second water storage container 52, and the dirt in the second water storage container 52 can be cleaned out by opening the sewage discharge pipe 523.

[0088] In another embodiment, in order to facilitate fixing the second water storage container 52 in the housing 1, an installation bracket 525 is further provided on the second water storage container 5, and the second water storage container 52 is fixed in the housing 1 through the installation bracket 525.

[0089] In another embodiment, for the bypass pipe 43 of the internal circulation module 4, its installation position has at least two methods, and both methods can meet the requirements of internal circulation.

[0090] Method 1, as Figure 2 shown, in an embodiment of the present application, a first three-way pipe is provided on the first connecting pipe 521, and the first three-way pipe is respectively connected to the heat exchanger 3 and the bypass pipe 43.

[0091] Specifically, during internal circulation, the water output from the heat exchanger 3 flows into the bypass pipe 43 through the first three-way pipe and enters the first water storage container 42. During the internal circulation process, the second water storage container 52 does not participate in the work.

[0092] Method 2, as Figure 1 shown, a second three-way pipe is provided on the second connecting pipe 522, and the second three-way pipe is respectively connected to the water outlet pipe 12 and the bypass pipe 43.

[0093] Specifically, during internal circulation, the water output from the heat exchanger 3 first enters the second water storage container 52, and the water in the second water storage container 52 flows into the bypass pipe 43 through the second three-way pipe and then enters the first water storage container 42. During the internal circulation process, the second water storage container 52 participates in the work.

[0094] In another embodiment of the present application, a first connecting pipe 421 and a second connecting pipe 422 are provided on the first water storage container 42. The water outlet of the first connecting pipe 421 is arranged at the bottom of the first water storage container 42, and the water inlet of the second connecting pipe 422 is arranged at the top of the first water storage container 42.

[0095] Specifically, the outlet of the first connecting pipe 421 is arranged at the bottom of the first water storage container 42 to meet the requirement that the first water storage container 42 is filled with water from the bottom. Similarly, the inlet of the second connecting pipe 422 is arranged at the top of the first water storage container 42 so that the water at the top of the first water storage container 42 is output through the second connecting pipe 422.

[0096] In an embodiment, the circulation pump 41, the first water storage container 42 and the bypass pipe 43 are sequentially connected, and the circulation pump 41 is connected to the water inlet end of the heat exchanger 3; a first electric control valve 44 is provided on the bypass pipe 43, and the first electric control valve 44 is configured to control the on-off of the bypass pipe 43.

[0097] Specifically, by configuring the first electric control valve 44 in the internal circulation module 4, the on-off of the bypass pipe 43 is controlled by the first electric control valve 44. When the gas water heater performs an internal circulation operation, the first electric control valve 44 opens the bypass pipe 43 so that water circulates between the heat exchanger 3 and the first water storage container 42 under the action of the circulation pump 41.

[0098] For the first water storage container 42, on the one hand, it needs to meet the requirements of internal circulation flow, and on the other hand, it also needs to serve as a connecting component between the heat exchanger 3 and the water inlet pipe 11. For this purpose, the water inlet pipe 11, the first water storage container 42, the circulation pump 41 and the water inlet end of the heat exchanger 3 are connected in sequence.

[0099] Specifically, the water flowing in through the water inlet pipe 11 first enters the first water storage container 42, and then flows into the heat exchanger 3.

[0100] In the case where the gas water heater has the zero cold water function, a zero cold water pipe 13 is provided on the housing 1. In an embodiment of the present application, a four-way pipe 45 is provided on the first water storage container 42; a second electric control valve 16 is provided on the zero cold water pipe 13, and the second electric control valve 16 is configured to control the on / off of the zero cold water pipe 13; the four-way pipe 45 is respectively connected to the bypass pipe 43, the water inlet pipe 11 and the zero cold water pipe 13.

[0101] Specifically, in the zero cold water mode, it is necessary to realize the heating treatment of the water in the external water pipe by the gas water heater, that is, to perform external circulation. And in the internal circulation mode, it is necessary to realize the circulating heating of the water in the water circuit inside the housing 1. By configuring a second electric control valve 16 on the zero cold water pipe 13, when performing internal circulation, the second electric control valve 16 will close the zero cold water pipe 13, thereby ensuring that after the circulation pump 41 is started, the water in the external water pipe will not enter the first water storage container 42 through the zero cold water pipe 13, thereby improving the water temperature adjustment efficiency of the internal circulation.

[0102] In another embodiment, a one-way valve 46 is provided on the bypass pipe 43, and the one-way valve 46 is configured to limit the water in the bypass pipe 43 to flow unidirectionally to the first water storage container 42.

[0103] Embodiment three, refer to Figure 1 , the present invention also provides a control method for a gas water heater, and the gas water heater has a first water use mode and a second water use mode; In the first water use mode, after starting to use water, the electric heating module 5 is powered on and started to heat the water in the second water storage container 52 for instant hot water supply. At this time, the burner is not started; In the second water use mode, after starting to use water, the burner is started to heat the water flowing in the heat exchanger 3.

[0104] Specifically, in the first water usage mode, taking kitchen water usage as an example, in the kitchen water usage scenario, the required temperature and flow rate of hot water are both lower than the requirements for water temperature and water flow rate in the user's bathing water usage. For this reason, the first water usage mode is activated. In this mode, the electric heating module 5 will start running. After the user turns on the faucet, the water flowing in from the water inlet pipe 11 enters the second water storage container 52 via the heat exchanger 3, and the water in the second water storage container 52 is quickly heated by the electric heating component 51 to achieve instant hot water supply, thereby meeting the water usage requirements in water usage scenarios such as the kitchen.

[0105] In the second water usage mode, taking bathing water usage as an example, higher water temperature and water flow rate are required. At this time, the burner is started to burn, and the normal operation of heating water by the gas water heater is carried out.

[0106] In a certain embodiment, in order to meet the user's demand for quick water usage, in the second water usage mode, after the user starts using water, the electric heating module 5 and the burner are started simultaneously, and after the water temperature at the outlet of the heat exchanger 3 reaches the set outlet water temperature value, the electric heating module 5 is powered off and stops running. In this way, the output of cold water at the initial stage when the user starts using water can be reduced to meet the user's requirement for quickly obtaining hot water.

[0107] In another embodiment of the present application, the control method of the gas water heater further includes: zero cold water mode.

[0108] When the zero cold water mode is executed, the bypass pipe 43 is closed and the circulation pump 41 and the electric heating module 5 are started. The water input from the zero cold water pipe 13 sequentially passes through the first water storage container 42, the heat exchanger 3, and the second water storage container 52 and is output from the water outlet pipe 12 to the external circulation pipeline. The electric heating module 5 heats the water flowing through the second water storage container 52 until the water temperature at the outlet of the first water storage container 42 reaches the first set temperature value T1.

[0109] Specifically, since the gas water heater is equipped with an electric heating module 5, when the zero cold water mode is executed, the heat generated by the electric heating of the electric heating module 5 can be first relied on to circulate and heat the water in the external pipeline. During this process, when the water storage volume and the water temperature increase amount in the external pipeline are not high, the electric heating module 5 can be used to meet the requirement of heating water in the zero cold water mode. In this way, the burner does not need to be started to reduce the running noise.

[0110] In another embodiment, limited by the heating power of the electric heating module 5, when the water storage volume and the water temperature increase amount in the external pipeline are relatively high, the electric heating module 5 will not be able to meet the zero cold water heating requirement, and further heating of the water flowing in the heat exchanger 3 by the burner is required.

[0111] Therefore, in the zero cold water mode, if the running time of the circulation pump 41 is greater than the fifth time t5 and the water temperature at the outlet of the first water storage container 42 does not reach the first set temperature value T1, the burner is started until the water temperature at the outlet of the first water storage container 42 reaches the first set temperature value T1.

[0112] Specifically, the specific control method for the gas water heater to start the burner to execute the zero cold water heating function can refer to the control process of the gas water heater executing the zero cold water mode in the conventional technology, which is not limited here.

[0113] In the execution of the zero cold water mode, the bypass pipe 43 needs to be closed, the circulation pump 41 is started, and the burner and / or the electric heating module 5 are started. The water input from the zero cold water pipe 13 enters the heat exchanger 3 through the first water storage container 42 for heating. The water output from the heat exchanger 3 first enters the second water storage container 52 and then is output to the external circulation pipeline through the water outlet pipe 12.

[0114] After the execution of the zero cold water mode ends and during the normal water use process, there is a situation where the user briefly turns off the water and then restarts it. At this time, in order to avoid the residual heat in the heat exchanger 3 causing the internal water temperature to rise too high, the internal circulation mode can be executed.

[0115] After pausing the water use, the internal circulation mode is executed. In the internal circulation mode, the bypass pipe 43 is opened and the circulation pump 41 is started, so that the water circulates between the heat exchanger 3, the second water storage container 52 and the first water storage container 42 until the water temperature at the outlet of the first water storage container 42 reaches the second set temperature value T2.

[0116] After the zero cold water gas water heater executes the zero cold water mode, the user can use hot water for bathing. During the user's use of hot water, there is a situation where the water use is temporarily shut off. During this process, since the water temperature at the water inlet pipe 11 is relatively low, the conventional technology will execute the zero cold water mode again. However, at this time, the water temperature in the water outlet pipe 12 and the user's water use terminal pipeline is still relatively high, and frequent startup of the zero cold water mode will cause an increase in energy consumption.

[0117] Therefore, when the user temporarily shuts off the water during the use of hot water, the internal circulation mode can be executed, that is, the bypass pipe 43 is opened and the circulation pump 41 is started, so that the water circulates between the heat exchanger 3 and the first water storage container 42. In this way, the cold water in the first water storage container 42 circulates into the heat exchanger 3 to absorb the residual heat of the heat exchanger 3, thereby avoiding excessive temperature fluctuations in the outlet water temperature caused by the rising of the residual heat of the heat exchanger 3. At the same time, after the user restarts, since the burner will start after a certain delay, the hot water in the first water storage container 42 can flow into the heat exchanger 3 and finally be output, so as to avoid excessive temperature fluctuations in the outlet water temperature caused by cold water entering the heat exchanger 3 and not being heated and being output from the water outlet pipe 12 in the conventional technology.

[0118] In the internal circulation mode, if the running time of the circulation pump 41 is greater than the sixth time t6 and the water temperature at the outlet of the first water storage container 42 does not reach the second set temperature value T2, the electric heating component 51 in the electric heating module 5 is started for auxiliary heating. This can more effectively ensure that the hot water output from the water outlet pipe 12 is at a constant temperature after the user uses water again, thus improving the user experience.

[0119] In some embodiments, to avoid frequent activation of the internal circulation during use, after the user pauses using water, the bypass pipe 43 is opened and the circulation pump 41 is started. Specifically: After the normal water use time exceeds the first set time t1 and the user pauses using water, the bypass pipe 43 is opened and the circulation pump 41 is started.

[0120] Specifically, during the user's water use process, if the water use time exceeds the set first set time t1, at this time, after the user finishes using water and closes the water supply, the zero-cold-water gas water heater will trigger the execution of the internal circulation mode. In this way, it is possible to avoid waste of additional energy consumption caused by frequent activation of the internal circulation mode during the user's frequent start and stop of the water use process.

[0121] In another embodiment, opening the bypass pipe 43 and starting the circulation pump 41 are specifically as follows: when the running time of the circulation pump 41 exceeds the second set time t2 and the water temperature at the outlet of the first water storage container 42 does not reach the second set temperature value T2, the burner is started until the water temperature at the outlet of the first water storage container 42 reaches the third set temperature value T3, and then the burner is shut down and the circulation pump 41 continues to run until the water temperature at the outlet of the first water storage container 42 reaches the second set temperature value T2; where T2 > T3.

[0122] Specifically, when the zero-cold-water gas water heater is in the internal circulation mode, the end of the internal circulation mode is triggered by judging the running time of the circulation pump 41 and the water temperature of the water output from the first water storage container 42, that is, when the running time of the circulation pump 41 exceeds the second set time t2 and the water temperature at the outlet of the first water storage container 42 exceeds the second set temperature value T2, the internal circulation mode ends and the circulation pump 41 stops running. This can ensure that the water inside the zero-cold-water gas water heater is fully circulated and mixed evenly.

[0123] Moreover, during the execution of the inner loop mode, when the water temperature at the outlet of the first water storage container 42 fails to reach the second set temperature value T2 due to excessive heat absorption by the water temperature of the first water storage container 42, in this case, the burner needs to be started to assist in heating the heat exchanger 3. After the burner is started, the burner is shut down after detecting that the water temperature at the outlet of the first water storage container 42 exceeds the third set temperature value T3, and the circulation pump 41 continues to operate to absorb the waste heat of the heat exchanger 3 so that the water temperature at the outlet of the first water storage container 42 continues to rise until it exceeds the second set temperature value T2, and then the circulation pump 41 is shut down.

[0124] In some other embodiments, during the normal water usage process after the zero cold water mode is executed, if the water temperature at the outlet of the first water storage container 42 is lower than the set start water temperature value Ts after the water usage is paused for more than the third set time t3, the zero cold water mode is re-executed; wherein, t3 > t2; T3 > Ts; T1 > Ts.

[0125] Specifically, after the user turns off the water, regardless of whether the inner loop mode is executed, after the water usage is paused for more than the third set time t3, the temperature drop of the water in the pipeline between the water outlet pipe 12 and the water usage terminal will become larger. In this case, the zero cold water mode needs to be executed again.

[0126] In some embodiments, when the burner is shut down and the circulation pump 41 continues to operate until the water temperature at the outlet of the first water storage container 42 reaches the second set temperature value T2, specifically: During the process of the circulation pump 41 continuing to operate after the burner is shut down, if the water temperature at the outlet of the heat exchanger 3 is higher than the fourth set temperature value T4 and the water temperature at the outlet of the first water storage container 42 is higher than T2, the bypass pipe 43 is first closed and the flow path between the zero cold water pipe 13 and the circulation pump 41 is opened. After the circulation pump 41 starts to operate for a duration greater than the fourth duration t4, the bypass pipe 43 is opened and the flow path between the zero cold water pipe 13 and the circulation pump 41 is closed, and the circulation pump 41 continues to operate until the water temperature at the outlet of the heat exchanger 3 is lower than T5 and the water temperature at the outlet of the first water storage container 42 is higher than T2.

[0127] wherein, t3 > t4; T4 > T5 > T2.

[0128] Specifically, in the internal circulation mode, when the burner is started for auxiliary heating, there may be excessive heat generated by the burner, which may cause the overall water temperature inside to be too high in the internal circulation mode. At this time, a certain amount of cold water can be introduced through the zero-cold water pipe 13 to further reduce the internal water temperature. That is, if the water temperature at the outlet of the heat exchanger 3 is higher than the fourth set temperature value T4 and the water temperature at the outlet of the first water storage container 42 is higher than T2, and the excessive heat generated by the heat exchanger 3 due to the burner heating causes the water temperature to be too high, at this time, the bypass pipe 43 can be closed and the flow path between the zero-cold water pipe 13 and the circulation pump 41 can be opened. Under the action of the circulation pump 41, a certain amount of cold water is introduced through the zero-cold water pipe 13 to reduce the overall water temperature of the internal circulating water, so as to finally achieve a small fluctuation in the outlet water temperature when the user uses water again, thereby improving the user experience.

[0129] Among them, for the specific values of the above set temperature and set time, they can be obtained through experiments according to different models and are not limited here.

[0130] The above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions required to be protected by the present invention.

Claims

1. A hot water supply system with zero cold water function, Characterized in that, It includes: A gas water heater, which is configured with a water inlet pipe, a water outlet pipe and a zero cold water pipe. The water outlet pipe is connected to an external hot water supply pipe, and the zero cold water pipe is connected to an external return water pipe; Multiple water using terminals; A return water controller, which includes: a mounting shell, a three-way valve, an electronic control board and a power supply module. The three-way valve has a water inlet valve port, a first water outlet valve port and a second water outlet valve port. The water inlet valve port selectively communicates with the first water outlet valve port or the second water outlet valve port; the three-way valve is arranged in the mounting shell; the electronic control board has a wireless communication module, and the wireless communication module is configured to wirelessly communicate with the zero cold water water heater. The electronic control board is arranged in the installation space and is connected to the three-way valve; the power supply module is arranged on the mounting shell and is configured to supply power to the electronic control board and the three-way valve; Wherein, the water inlet valve port is connected to the hot water supply pipe, the first water outlet valve port of the return water is connected to the corresponding water using terminal, the second water outlet valve port is connected to the return water pipe, and the wireless communication module is communicatively connected to the gas water heater.

2. The hot water supply system with zero cold water function according to claim 1, Characterized in that, The power supply module is a power supply cable, and the power supply cable is connected to the electronic control board and extends outside the mounting shell.

3. The hot water supply system with zero cold water function according to claim 1, Characterized in that, The power supply module is a battery mounting rack, and the battery mounting rack is configured to mount a storage battery, and the battery mounting rack is arranged in the installation space.

4. The hot water supply system with zero cold water function according to claim 1, Characterized in that, The gas water heater includes a housing and a burner, a heat exchanger, an internal circulation module, an electric heating module and a controller arranged in the housing. The water inlet pipe, the water outlet pipe and the zero cold water pipe are arranged on the housing; the internal circulation module includes a circulation pump, a first water storage container and a bypass pipe. The first water storage container is connected between the circulation pump and the bypass pipe and forms an internal flow path; the electric heating module includes an electric heating component and a second water storage container, and the electric heating component is configured to electrically heat the water in the second water storage container; the internal flow path is connected to the heat exchanger and forms an internal circulation flow path, and the second water storage container is connected between the heat exchanger and the water outlet pipe; the controller is configured to control the operation of the circulation pump and the electric heating component, and the wireless communication module is communicatively connected to the controller.

5. The hot water supply system with zero cold water function according to claim 4, Characterized in that, The circulation pump, the first water storage container and the bypass pipe are connected in sequence, and the circulation pump is connected to the water inlet end of the heat exchanger; a first electric control valve is arranged on the bypass pipe, and the first electric control valve is configured to control the on-off of the bypass pipe; And / or, a four-way pipe is provided on the first water storage container; a second electric control valve is provided on the zero-cold water pipe, and the second electric control valve is configured to control the on / off of the zero-cold water pipe; the four-way pipe is respectively connected to the bypass pipe, the water inlet pipe and the zero-cold water pipe.

6. A control method for a hot water supply system with zero-cold water function according to any one of claims 1-5, characterized in that, it includes: Zero-cold water mode; In the execution of the zero-cold water mode, the return water controller connected to the water-using terminal in the use state receives a control signal sent by the gas water heater, and the return water controller switches the three-way valve to conduct the hot water supply pipe and the return water pipe connected to the water-using terminal, and the water in the hot water supply pipe and the return water pipe between the water-using terminal and the gas water heater circulates into the gas water heater for heating until the first set temperature value T1 is reached.

7. The control method for a hot water supply system with zero-cold water function according to claim 6, characterized in that, In the execution of the zero-cold water mode, the bypass pipe is closed and the circulation pump and the electric heating component are started. The water input from the zero-cold water pipe sequentially passes through the first water storage tank, the heat exchanger and the second water storage tank and is output from the water outlet pipe to the external circulation pipeline. The electric heating module heats the water flowing through the second water storage tank until the water temperature at the outlet of the first water storage tank reaches the first set temperature value T1.

8. The control method for a hot water supply system with zero-cold water function according to claim 7, characterized in that, The control method further includes: During the normal water use process after the execution of the zero-cold water mode, after the water use is paused, the bypass pipe is opened and the circulation pump is started, so that the water circulates between the heat exchanger and the first water storage tank until the water temperature at the outlet of the first water storage tank reaches the second set temperature value T2.

9. The control method for a hot water supply system with zero-cold water function according to claim 8, characterized in that, Opening the bypass pipe and starting the circulation pump specifically means: when the circulation pump starts to run for a duration exceeding the second set time t2 and the water temperature at the outlet of the first water storage tank does not reach the second set temperature value T2, the burner is started until the water temperature at the outlet of the first water storage tank reaches the third set temperature value T3, and then, the burner is shut down and the circulation pump continues to run until the water temperature at the outlet of the first water storage tank reaches the second set temperature value T2; wherein, T2 > T3.

10. The control method for a hot water supply system with zero-cold water function according to any one of claims 6-9, characterized in that, it further includes: The first water use mode and the second water use mode; In the first water use mode, after the water use is started, the electric heating module is powered on and started to heat the water in the second water storage container for instant hot water supply. At this time, the burner is not started; In the second water use mode, after the water use is started, the burner is started to heat the water flowing in the heat exchanger.

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