Zero-cold-water gas water heater control method and zero-cold-water gas water heater

Abstract

The invention discloses a control method of a zero-cold-water gas water heater and the zero-cold-water gas water heater. According to the control method of the zero-cold-water gas water heater, the zero-cold-water gas water heater is provided with a water inlet pipe, a water outlet pipe and a zero-cold-water pipe, a heat exchanger of the zero-cold-water gas water heater communicates with the water outlet pipe through a water return pipe, the heat exchanger is connected with the water inlet pipe and the zero-cold-water pipe through a circulating pump, and a bypass pipe is arranged between the water return pipe and the circulating pump; the control method comprises the steps that in the power-on and power-on water using process of the zero-cold-water gas water heater, after water using is paused, and after the water using pausing time length is larger than first time length t1, a circulating pump is started, so that water stored in the zero-cold-water gas water heater circularly flows among a water inlet pipe, a heat exchanger and a water outlet pipe. The fluctuation range of the secondary boiled water temperature is reduced, and the user experience is improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of household appliances, and in particular relates to a control method for a zero-cold-water gas water heater and a zero-cold-water gas water heater. Background Art

[0002] At present, water heaters are household appliances commonly used in people's daily lives. Water heaters are divided into gas water heaters and electric water heaters. Among them, gas water heaters are widely used because of their convenience. Conventional gas water heaters usually include burners, combustion chambers and heat exchangers. The burner burns gas in the combustion chamber to heat the water flowing through the heat exchanger.

[0003] Zero cold water gas water heaters with zero cold water function are widely promoted and used because of their function of heating water stored in water pipes. During use, after turning off the water, the zero cold water will be started according to the method set by the user, such as automatically starting the zero cold water function after setting the duration, or starting the zero cold water function after boiling the water to ensure that the water in the water pipe can be maintained within the set temperature range. However, in actual use, there are cases where users use water for a short time and then restart. At this time, because a certain amount of hot water is stored in the heat exchanger, delayed ignition is required. At this time, some cold water will enter the heat exchanger and be output without being fully heated, resulting in the problem of raw water in the second boiling water, which causes large fluctuations in the outlet water temperature and affects the user experience.

[0004] In view of this, how to design a water heater technology that reduces the fluctuation amplitude of the outlet water temperature 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 control method for a zero-cold-water gas water heater and a zero-cold-water gas water heater, which can reduce the fluctuation amplitude of outlet water temperature and improve the user experience of the zero-cold-water gas water heater.

[0006] In order to achieve the above technical objectives, the present invention adopts the following technical solutions: In one aspect, the present invention provides a control method for a zero-cold-water gas water heater, wherein the zero-cold-water gas water heater is provided with a water inlet pipe, a water outlet pipe and a zero-cold-water pipe, a heat exchanger of the zero-cold-water gas water heater is connected to the water outlet pipe through a return pipe, the heat exchanger is connected to the water inlet pipe and the zero-cold-water pipe through a circulation pump, and a bypass pipe is provided between the return pipe and the circulation pump, wherein the control method comprises: During the process of powering on and using water, after the water use is suspended, when the water use suspension time is greater than the first time length t1, the circulation pump is started to allow the water stored in the zero cold water gas water heater to circulate between the water inlet pipe, the heat exchanger and the water outlet pipe.

[0007] When the user shuts off the water for the second time and then uses the water again, during the water shutoff process, since there is hot water in the heat exchanger, the waste heat of the heat exchanger will continue to heat the water inside. In order to lower the temperature of the hot water in the heat exchanger so that the water temperature output from the outlet pipe fluctuates less after the secondary water use is started, the circulation pump is started after the water use is suspended for a period of time to allow the water in the heat exchanger to circulate internally. In this way, the water temperature in the heat exchanger can be lowered so that the outlet pipe can output relatively constant temperature hot water, thereby reducing the fluctuation range of the secondary boiling water temperature and improving user experience.

[0008] In one embodiment of the present application, after the circulation pump is started when the water use suspension time is longer than the first time t1, the circulation pump stops running after the circulation pump starts running for longer than the second time t2.

[0009] In one embodiment of the present application, the control method further includes: After the water use suspension time is greater than the first time t1, the flow path of the bypass pipe is first closed and the flow path between the zero cooling water pipe and the circulation pump is opened. After the circulating pump starts running for a time greater than the third time t3, the flow path of the bypass pipe is opened and the flow path between the zero cooling water pipe and the circulation pump is closed.

[0010] In one embodiment of the present application, if the outlet water temperature of the heat exchanger is lower than the set circulating water temperature T1, the circulating pump stops running.

[0011] In one embodiment of the present application, after the circulating pump is started and the running time is longer than the second time length t2, if the outlet water temperature of the heat exchanger is higher than the set circulating water temperature T1; the flow path of the bypass pipe is closed again and the flow path between the zero cooling water pipe and the circulating pump is opened; after the circulating pump is started and the running time is longer than the fourth time length t4, the flow path of the bypass pipe is opened again and the flow path between the zero cooling water pipe and the circulating pump is closed; wherein, t4 <t3。

[0012] In another aspect, the present invention further provides a zero-cold-water gas water heater, wherein the zero-cold-water gas water heater implements the control method of the zero-cold-water gas water heater; The zero cold water gas water heater comprises: The shell is provided with a zero-cold water pipe; A burner, the burner is used to burn gas; A heat exchanger, wherein the heat exchanger is used for water flow heat exchange; The water inlet and outlet assembly includes a circulation pump, a first electric control valve, a water inlet pipe, a water outlet pipe, a water return pipe and a bypass pipe. The inlet of the circulation pump is connected to the water inlet pipe, the bypass pipe is connected between the return pipe and the inlet of the circulation pump, the outlet pipe is connected to the return pipe, and the first electrically controlled valve is configured to control the return pipe to selectively communicate with the bypass pipe; Wherein, the outlet of the circulation pump is connected to the inlet of the heat exchanger, the outlet of the heat exchanger is connected to the return pipe, and the zero cooling water pipe is connected to the inlet of the circulation pump.

[0013] In one embodiment of the present application, a multi-way connector is provided on the inlet of the circulation pump, and the multi-way connector has a first interface, a second interface, a third interface and a fourth interface, the first interface is connected to the inlet of the circulation pump, the second interface is connected to the water inlet pipe, the third interface is connected to the bypass pipe; the fourth interface is connected to the zero cooling water pipe; Wherein, a second electrically-controlled valve is arranged between the water inlet pipe and the second interface, and a third electrically-controlled valve is arranged between the zero-cooling water pipe and the fourth interface.

[0014] In one embodiment of the present application, the heat exchanger comprises: A heat exchange shell, wherein a smoke inlet and a smoke outlet are arranged on the heat exchange shell, a first air guide plate is arranged in the heat exchange shell, the first air guide plate covers below the smoke outlet, a gap is formed between the first air guide plate and the smoke outlet, a fixed end of the first air guide plate is arranged on the inner wall of the heat exchange shell, and a free end of the first air guide plate is arranged with a flange structure extending downward; A heat exchange tube, wherein the heat exchange tube is arranged in the heat exchange shell, the heat exchange tube is located below the first air guide plate, one pipe opening of the heat exchange tube is connected to the outlet of the circulation pump, and the other pipe opening of the heat exchange tube is connected to the return pipe; a second air guide plate is arranged in the heat exchange shell, the second air guide plate covers above the smoke inlet and is located below the first air guide plate, a plurality of second ventilation holes are arranged on the second air guide plate, and the heat exchange tube is located between the second air guide plate and the flange structure.

[0015] In one embodiment of the present application, the heat exchanger comprises: A plurality of heat exchange tubes, wherein the heat exchange tubes are flat tubes, and the plurality of heat exchange tubes are arranged side by side, and the flat surfaces of two adjacent heat exchange tubes are arranged opposite to each other; A plurality of heat exchange fins, each of which is provided with a plurality of assembly holes, and a surface of each heat exchange fin is further provided with an air spoiler component, wherein the air spoiler component is arranged between two adjacent assembly holes, and a plurality of heat exchange fins are arranged side by side; Wherein, a plurality of the heat exchange tubes are interconnected to form a water flow channel, the heat exchanger further comprises an inlet pipe and an outlet pipe, and the water flow channel is connected between the inlet pipe and the outlet pipe; The heat exchange tube is installed in the assembly hole, the inlet pipe is connected to the outlet of the circulation pump, and the outlet pipe is connected to the return water pipe.

[0016] In one embodiment of the present application, a one-way valve is provided between the first electrically controlled valve and the bypass pipe, and the one-way valve is configured to restrict the water in the bypass pipe from flowing in one direction toward the circulation pump. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0018] Figure 1 It is a flow chart of the control method of the zero cold water gas water heater of the present invention; Figure 2 A schematic structural diagram of an embodiment of a zero cold water gas water heater of the present invention; Figure 3 for Figure 2 A schematic diagram of a partial structure without the outer shell; Figure 4 It is a flow path principle diagram of another embodiment of the zero cold water gas water heater of the present invention; Figure 5 for Figure 2 A schematic diagram of the structure of the heat exchanger; Figure 6 for Figure 5 A cross-sectional view of an embodiment of a heat exchanger; Figure 7 for Figure 5 An exploded view of an embodiment of a heat exchanger; Figure 8 for Figure 5 A partial cross-sectional view of the middle heat exchange shell; Fig. 9 for Figure 5 Schematic diagram of the local structure of the heat exchange shell.

[0019] Description of reference numerals: Shell 1000, zero cooling water pipe 1001; Burner 2000; Heat exchanger 3000; Combustion chamber 4000; Water inlet and outlet components 5000; Circulation pump 5100, multi-way connector 5200, first electrically controlled valve 5300, water inlet pipe 5400, water outlet pipe 5500, water return pipe 5600, bypass pipe 5700, second electrically controlled valve 5800, third electrically controlled valve 5900; Barrel body 5210, end cover 5220, first connecting pipe 5230, second connecting pipe 5240, water shield 5250, mounting bracket 5260, one-way valve 5310; Detection module 6000 , water flow sensor 6100 , first water temperature sensor 6200 , second water temperature sensor 6300 . DETAILED DESCRIPTION

[0020] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0021] It should be noted that in the description of the present invention, the terms "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like indicating directions or positional relationships are based on the directions or positional relationships shown in the drawings, which are only for the convenience of description, and do not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0022] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like 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 a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0023] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0024] The disclosure below provides many different embodiments or examples to realize different structures of the present invention. In order to simplify the disclosure of the present invention, the parts and settings of specific examples are described below. Of course, they are only examples, and the purpose is not to limit the present invention. In addition, the present invention can repeat reference numbers and / or reference letters in different examples, and this repetition is for the purpose of simplicity and clarity, which itself does not indicate the relationship between the various embodiments and / or settings discussed. In addition, the present invention provides various specific examples of 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.

[0025] A gas water heater is a water heater that uses gas as the main energy material and transfers the high-temperature heat generated by gas combustion to cold water flowing through a heat exchanger to prepare hot water.

[0026] A gas water heater generally comprises a shell, and components such as a burner, a heat exchanger, a fan and a fan cover arranged in the shell.

[0027] The gas is transported to the burner and ignited by an ignition device, so that the burner burns the transported gas to generate heat.

[0028] A heat exchange tube is arranged in the heat exchanger, one end of the heat exchange tube is connected to the water supply pipeline, and the other end of the heat exchange tube is connected to a shower head or a faucet.

[0029] 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 is increased to form hot water.

[0030] When the gas water heater is working, cold water provided by the water supply pipeline flows into the heat exchange tube, and then is heated into hot water by the heating source generated by the burner, and then flows out from the shower or faucet through the hot water valve for user use.

[0031] At the same time, when the gas water heater is working, the fan is powered on and runs at the same time. Under the action of the fan, the smoke generated by the burner is discharged to the outside.

[0032] Since the heat generated by the burner burning gas during operation will be conducted to the outer casing, in order to reduce the heat transfer.

[0033] Embodiment 1, as Figure 1 As shown, this embodiment proposes a control method for a zero-cold-water gas water heater, wherein the zero-cold-water gas water heater is provided with a water inlet pipe, a water outlet pipe and a zero-cold-water pipe, a heat exchanger of the zero-cold-water gas water heater is connected to the water outlet pipe through a return pipe, the heat exchanger is connected to the water inlet pipe and the zero-cold-water pipe through a circulation pump, a bypass pipe is provided between the return pipe and the circulation pump, and the control method comprises: During the process of powering on and using water, after the water use is suspended, when the water use suspension time is greater than the first time length t1, the circulation pump is started to allow the water stored in the zero cold water gas water heater to circulate between the water inlet pipe, the heat exchanger and the water outlet pipe.

[0034] Specifically, if Figure 1 As shown, in the actual use of the zero cold water gas water heater, after the user starts the zero cold water gas water heater, the zero cold water gas water heater is powered on, and cold water enters the heat exchanger through the water inlet pipe, is heated, and then outputs hot water from the heat exchanger. The hot water output by the heat exchanger enters the water outlet pipe through the return pipe and is finally transported to the water terminal. During the use process, the user may stop using water for a short time, and then turn on the zero cold water gas water heater again to use hot water, which is secondary water use. In the secondary water use process, because a certain amount of hot water is stored in the heat exchanger, in order to reduce the excessively high water outlet temperature of the water outlet pipe caused by the continuous heating of the residual heat of the hot water cup heat exchanger itself in the heat exchanger, the internal circulation is realized by starting the circulation pump during the secondary water use process.

[0035] During the secondary water use process, when the user suspends water use for a period of time exceeding the first period t1, the circulation pump starts to circulate internally. During the internal circulation process, the water in the heat exchanger can flow out through the return pipe and circulate into the heat exchanger through the water pipe outside the heat exchanger inside the zero cold water gas water heater, so as to reduce the excessive temperature rise caused by the continuous heating of the internal hot water by the residual heat of the heat exchanger.

[0036] As the heat exchanger releases waste heat, the water inside the zero-cold-water gas water heater self-circulates through a circulation pump to reduce fluctuations in the outlet water temperature.

[0037] If the user stops using water for a short time, there is no need to start the circulation pump. At this time, the water in the heat exchanger will not heat up too high because it is heated by the residual heat for a short time. Then it only needs to wait for the next time the user uses water.

[0038] When the user shuts off the water for the second time and then uses the water again, during the water shutoff process, since there is hot water in the heat exchanger, the waste heat of the heat exchanger will continue to heat the water inside. In order to lower the temperature of the hot water in the heat exchanger so that the water temperature output from the outlet pipe fluctuates less after the secondary water use is started, the circulation pump is started after the water use is suspended for a period of time to allow the water in the heat exchanger to circulate internally. In this way, the water temperature in the heat exchanger can be lowered so that the outlet pipe can output relatively constant temperature hot water, thereby reducing the fluctuation range of the secondary boiling water temperature and improving user experience.

[0039] In another embodiment, in order to control the start and stop of the circulation pump during the secondary water use process, the circulation pump is started after the water use suspension time is greater than the first time t1, and the circulation pump is stopped after the circulation pump starts running for a longer time than the second time t2.

[0040] Specifically, when the circulating pump is performing the internal circulation operation, the operating time of the circulating pump can be used as a control signal to trigger the circulation pump to stop. Since the internal water storage volume of the zero cold water gas water heater is certain, after the circulating pump circulates for a set time, the water inside the zero cold water gas water heater can be fully circulated and mixed, and the circulation pump can be stopped in time, thereby reducing energy consumption.

[0041] In another embodiment of the present application, the control method further includes: After the water use suspension time is greater than the first time t1, the flow path of the bypass pipe is first closed and the flow path between the zero cooling water pipe and the circulation pump is opened. After the circulating pump starts running for a time greater than the third time t3, the flow path of the bypass pipe is opened and the flow path between the zero cooling water pipe and the circulation pump is closed.

[0042] Specifically, since the amount of water stored inside the zero-cold-water gas water heater is small, in order to more effectively reduce the waste heat temperature rise of the heat exchanger, the zero-cold-water pipe can be used to introduce external water into the zero-cold-water gas water heater. That is, after starting the circulation pump, the bypass pipe is in a closed state and the zero-cold-water pipe is used to introduce part of the cold water in the external pipeline, and the amount of cold water introduced by the zero-cold-water pipe can be determined according to the amount of water stored inside the zero-cold-water gas water heater, and then the amount of cold water introduced by the zero-cold-water pipe can be controlled by controlling the running time of the circulation pump. In addition, after the running time of the circulation pump is greater than the third time length t3, the zero-cold-water pipe is stopped from introducing cold water and the bypass pipe is opened to realize internal circulation.

[0043] In this way, by utilizing part of the cold water introduced by the zero-cold water pipe to participate in the internal circulation, the waste heat of the heat exchanger can be absorbed more effectively, thereby reducing the temperature rise of the water outlet pipe.

[0044] In one embodiment, if the outlet water temperature of the heat exchanger is lower than the set circulating water temperature T1, the circulating pump stops running.

[0045] Specifically, after cold water is introduced into the zero-cold water pipe for internal circulation, when the cold water mixes with the internal hot water and absorbs the waste heat of the heat exchanger, the overall water temperature drops, and when the outlet water temperature of the heat exchanger is lower than the set circulating water temperature T1, the circulation pump is stopped.

[0046] In another embodiment, after the circulating pump is started and the running time is longer than the second time t2, if the outlet water temperature of the heat exchanger is higher than the set circulating water temperature T1; the flow path of the bypass pipe is closed again and the flow path between the zero cooling water pipe and the circulating pump is opened; after the circulating pump is started and the running time is longer than the fourth time t4, the flow path of the bypass pipe is opened again and the flow path between the zero cooling water pipe and the circulating pump is closed; wherein, t4 <t3。

[0047] Specifically, because the amount of cold water input into the zero cold water gas water heater through the zero cold water pipe at a single time cannot be too large, after the zero cold water pipe inputs cold water to start the internal circulation, if the outlet water temperature of the heat exchanger is higher than the set circulating water temperature T1, and the circulating pump starts running for longer than the second time period t2, the operation of inputting cold water through the zero cold water pipe is executed again. However, the amount of cold water input for the second time will be appropriately reduced to avoid too much cold water entering the internal circulation and causing the water temperature to be too low.

[0048] By switching the bypass pipe and the zero-cold water pipe to connect with the circulation pump during the secondary water use process, the cold water input from the zero-cold water pipe can be used to quickly and efficiently control the waste heat temperature rise of the heat exchanger, so that after the user stops using water and starts it again, the outlet water temperature of the outlet pipe will fluctuate less, thereby improving the user experience.

[0049] The specific values ​​of the above-mentioned set temperature and set time can be obtained through experiments according to different machine models, and are not limited here.

[0050] Embodiment 2, as Figure 2 and Figure 3 As shown, this embodiment proposes a gas water heater, which at least includes: a shell 1000, a burner 2000, a heat exchanger 3000 and a combustion chamber 4000, and the heat exchanger 3000 is used for water flow heat exchange.

[0051] During assembly, the burner 2000 is installed in the bottom area of ​​the combustion chamber, while the heat exchanger 3000 is installed in the top of the combustion chamber.

[0052] During actual use, after the gas is delivered to the burner 2000 and ignited, the high-temperature flue gas generated by the gas rises to heat the water flowing in the top heat exchanger 3000, and the high-temperature flue gas is finally output to the outside of the shell 1000 through the exhaust pipe.

[0053] In order to realize the function of zero cold water, a zero cold water pipe 1001 is also provided on the housing 1000; Among them, in order to solve the problem of large fluctuations in outlet water temperature caused by the secondary boiling water, the gas water heater includes: The water inlet and outlet assembly 5000 includes a circulation pump 5100, a first electrically controlled valve 5300, an inlet pipe 5400, an outlet pipe 5500, a return pipe 5600 and a bypass pipe 5700. The inlet pipe 5400 is connected to the water tank 5100. The bypass pipe 5700 is connected between the first electrically controlled valve 5300 and the water tank 5100. The outlet pipe 5500 is connected to the return pipe 5600. The first electrically controlled valve 5300 is configured to control the return pipe 5600 to selectively communicate with the bypass pipe 5700. Among them, the heat exchanger 3000 and the water inlet and outlet assembly 5000 are arranged in the shell 1000, the outlet of the circulation pump 5100 is connected to the inlet of the heat exchanger 3000, the outlet of the heat exchanger 3000 is connected to the return pipe 5600, the water inlet pipe 5400 and the water outlet pipe 5500 extend to the outside of the shell 1000, and the zero cooling water pipe is connected to the circulation pump.

[0054] Specifically, the water inlet pipe 5400 and the water outlet pipe 5500 configured for the water inlet and outlet assembly 5000 are used to connect to the external tap water pipe and the water terminal, and the zero-cold water pipe 1001 is connected to the external pipeline outside the equipment to form a zero-cold water loop.

[0055] During use, when the user uses hot water, the cold water transported by the tap enters the circulation pump 5100 through the water inlet pipe 5400, and enters the heat exchanger 3000 through the circulation pump 5100; the water entering the heat exchanger 3000 exchanges heat with the high-temperature flue gas generated by the burner 2000 burning gas to form hot water and flows into the outlet pipe 5500 through the return pipe 5600. Finally, the hot water is output from the outlet pipe 5500 and flows into the water use terminal, such as a faucet or shower.

[0056] When the user uses water and the user turns off the water for a short period of time, the internal circulation operation can be triggered according to the length of time the user turns off the water. Referring to the control method in Example 1, when the internal circulation is started, the first electrically controlled valve 5300 will be actuated to connect the return pipe 5600 with the bypass pipe 5700, thereby connecting the heat exchanger 3000, the return pipe 5600, the bypass pipe 5700 and the circulation pump 5100 in sequence to form a closed-loop water circulation flow path, that is, forming an internal circulation inside the device.

[0057] After the first electric control valve 5300 connects the return pipe 5600 with the bypass pipe 5700, the circulation pump 5100 is started. Under the action of the circulation pump 5100, the water in the external pipeline of the heat exchanger 3000 is input into the heat exchanger 3000. At the same time, the water in the heat exchanger 3000 circulates back to the external pipeline of the heat exchanger 3000.

[0058] In normal water use or zero cold water mode, the first electric control valve 5300 does not operate, and the return pipe 5600 is not connected to the bypass pipe 5700. The cold water introduced by the water inlet pipe or the zero cold water pipe enters the heat exchanger through the circulation pump 5100 for heating.

[0059] In one embodiment of the present application, a multi-way connector 5200 is provided on the water tank 5100, and the multi-way connector 5200 has a first interface, a second interface, a third interface and a fourth interface. The first interface is connected to the circulation pump 5100, the second interface is connected to the water inlet pipe 5400, the third interface is connected to the bypass pipe 5700, and the fourth interface is connected to the zero cooling water pipe 1001.

[0060] Specifically, in order to facilitate the connection of the bypass pipe 5700, the water inlet pipe 5400 and the zero cooling water pipe 1001 to the water tank 5100 respectively, a multi-way connector 5200 is provided on the water tank 5100, and the zero cooling water pipe 1001, the bypass pipe 5700 and the water inlet pipe 5400 are respectively connected to the corresponding interfaces of the multi-way connector 5200.

[0061] In another embodiment of the present application, a one-way valve 5310 is provided between the first electrically controlled valve 5300 and the bypass pipe 5700 , and the one-way valve 5310 is configured to limit the water in the bypass pipe 5700 from flowing to the circulation pump 5100 in one direction.

[0062] Specifically, during the self-circulation of the gas water heater before the second water heating, since the water inlet pipe 5400 and the bypass pipe 5700 are also interconnected through the multi-way connector 5200, in order to prevent the cold water from flowing backward through the bypass pipe 5700 due to the water pressure of the tap water pipe when the circulation pump 5100 is not started, a one-way valve 5310 can be set between the first electric control valve 5300 and the bypass pipe 5700. The one-way valve 5310 will limit the flow direction of the water flow in the bypass pipe 5700, so that the water in the bypass pipe 5700 will not flow backward. This ensures that after the circulation pump 5100 is started, the water in the heat exchanger 3000 flows into the water tank 5100 through the bypass pipe 5700.

[0063] Furthermore, in order to introduce cold water through the zero cooling water pipe 1001 as needed during the internal circulation process, a second electrically controlled valve 5700 may be provided between the water inlet pipe and the second interface, and a third electrically controlled valve 5800 may be provided between the zero cooling water pipe and the fourth interface.

[0064] Specifically, during the internal circulation of secondary water, the water inlet pipe can be closed by the second electric control valve 5700, and the zero cold water pipe 1001 can be opened by the third electric control valve 5800. After starting the circulation pump 5100, the water in the heat exchanger 3000 is output from the outlet pipe 5500 via the return pipe 5600, and the zero cold water pipe 1001 introduces cold water into the circulation pump 5100 and transports it into the heat exchanger 3000.

[0065] In one embodiment of the present application, Figure 4As shown, the zero-cold-water gas water heater further includes a detection module 6000 , which includes a water flow sensor 6100 disposed between the circulation pump 5100 and the heat exchanger 3000 , and the water flow sensor is configured to trigger the circulation pump 5100 to adjust the rotation speed.

[0066] Specifically, the flow sensor can detect the operating status of the zero-cold-water gas water heater. During use, when the water supply pressure of the external pipeline decreases, the water flow under normal heating state decreases. At this time, the water flow sensor 6100 detects that the water flow rate drops below the set flow rate value, and will trigger the circulation pump to start, so as to achieve auxiliary pressurization through the circulation pump, thereby ensuring that the user can use the water heater normally.

[0067] At the same time, the water flow sensor 6100 can more accurately detect the water flow output by the circulation pump 5100, and then introduce a more accurate cold water flow through the zero cold water pipe 1001 during the internal circulation process.

[0068] In addition, in order to accurately control the water temperature, the detection module 6000 also includes a temperature sensor, which includes a first water temperature sensor 6200 arranged at the inlet of the heat exchanger and a second water temperature sensor 6300 arranged at the outlet of the heat exchanger.

[0069] During use, the third water temperature sensor 6300 can detect the temperature of the hot water output by the heat exchanger 3000, and adjust the gas supply of the burner 2000 and the speed of the circulation pump according to the output hot water temperature, so that the water temperature remains constant. For the specific control method of the circulation pump and the burner, reference can be made to conventional technology, which will not be limited or elaborated here.

[0070] Embodiment 3: For the zero-cold-water gas water heater in this embodiment, the heat exchanger 3000 used can be a conventional coil heat exchanger. In order to further improve the heat exchange efficiency of the heat exchanger 3000 and reduce the overall energy consumption, the following structural improvement design is performed on the heat exchanger 3000.

[0071] like Figure 5-Figure 9 As shown, the heat exchanger 3000 adopts a condensing heat exchange method, which includes a heat exchange shell 3100, on which a smoke inlet 3101 and a smoke outlet 3102 are arranged, and a first air guide plate 3110 is arranged in the heat exchange shell 3100, the first air guide plate 3110 covers the lower part of the smoke outlet 3102, and a gap is formed between the first air guide plate 3110 and the smoke outlet 3102, the fixed end of the first air guide plate 3110 is arranged on the inner wall of the heat exchange shell 3100, and the free end of the first air guide plate 3110 is provided with a flange structure 3111 extending downward; The heat exchange tube 3200 is disposed in the heat exchange shell 3100 , and the heat exchange tube 3200 is located below the first air guide plate 3110 .

[0072] Specifically, in the actual assembly process, the heat exchange tube 3200 is placed in the heat exchange shell 3100 and arranged below the first air guide plate 3110. During use, the heat exchanger is arranged in the shell of the gas water heater and above the combustion chamber. The high-temperature flue gas generated by the combustion of the gas in the combustion chamber 4000 enters the heat exchange shell 3100 through the flue gas inlet 3101.

[0073] The high-temperature flue gas entering the heat exchange shell 3100 will exchange heat with the heat exchange tube 3200, but the high-temperature flue gas will not be directly output from the top flue gas outlet 3102 due to the blocking restriction of the first air guide plate 3110. Under the action of the first air guide plate 3110, the flue gas is restricted to the bottom of the first air guide plate 3110, so that the flue gas can fully exchange heat with the heat exchange tube 3200. In addition, the free end of the first air guide plate 3110 is provided with a flange structure 3111 extending downward, and the flange structure 3111 can be used to force the flue gas entering the heat exchange shell 3100 to bypass the lower edge of the flange structure 3111 before being output from the flue gas outlet 3102, thereby maximizing the heat exchange time between the flue gas and the heat exchange tube 3200.

[0074] In another embodiment, the heat exchange tube 3200 is a bellows structure. Specifically, the heat exchange tube 3200 can be composed of more than 3 layers of stainless steel bellows, and each layer of the coils is in parallel to reduce the overall water resistance. In addition, a drain pipe (not marked) is also provided on the bottom plate of the heat exchange shell, and the condensed water in the heat exchange shell 3100 is discharged through the drain pipe.

[0075] In one embodiment of the present application, the first air guide plate 3110 extends obliquely downward from the fixed end toward the free end.

[0076] Specifically, in order to reduce the wind resistance of the flue gas and guide the flue gas to flow smoothly in the heat exchange shell 3100, the first air guide plate 3110 is arranged in an inclined manner in the heat exchange shell 3100. The fixed end of the first air guide plate 3110 is located at a higher position. After the flue gas enters the heat exchange shell 3100, it will flow along the first air guide plate 3110 toward the flange structure 3111, and finally bypass the flange structure 3111 to rise to the top of the heat exchange shell 3100 and be output from the flue gas outlet 3102.

[0077] In another embodiment, a plurality of first ventilation holes 3112 are disposed on the first air guide plate 3110 , and the first ventilation holes 3112 are away from the fixed end of the first air guide plate 3110 .

[0078] Specifically, in order to more effectively reduce wind resistance and ensure smooth output of smoke, a plurality of first ventilation holes 3112 are provided on the first air guide plate 3110. During use, part of the smoke can be discharged through the first ventilation holes 3112, while the rest of the smoke bypasses the bottom of the flange structure 3111 and flows to the smoke outlet 3102.

[0079] In some embodiments, the distribution position of the first ventilation holes 3112 may be such that the first ventilation holes 3112 are formed on the flange structure 3111 ; and / or the first ventilation holes 3112 are formed at the free end of the first air guide plate 3110 .

[0080] In another embodiment of the present application, a second air guide plate 3120 is provided in the heat exchange shell 3100, the second air guide plate 3120 covers the top of the smoke inlet 3101 and is located at the bottom of the first air guide plate 3110, a plurality of second ventilation holes 3121 are provided on the second air guide plate 3120, and the heat exchange tube 3200 is located between the second air guide plate 3120 and the flange structure 3111.

[0081] Specifically, in order to effectively disperse the flue gas entering the heat exchange shell 3100 so that it can be more evenly dispersed to various positions of the heat exchange tube 3200, a second air guide plate 3120 is additionally configured in the heat exchange shell 3100, and the second air guide plate 3120 covers the flue gas inlet 3101. In this way, after the flue gas enters through the flue gas inlet 3101, it will be output from the second ventilation hole 3121 and flow horizontally to the heat exchange tube 3200 on one side, and then in the height direction, the flue gas flow rate is evenly distributed to the heat exchange tube 3200, so as to more effectively improve the heat exchange uniformity of the heat exchange tube 3200.

[0082] In one embodiment, the second air guide plate 3120 is an inverted U-shaped structure, and a second ventilation hole 3121 is disposed on a side of the second air guide plate 3120 adjacent to the heat exchange tube 3200 .

[0083] Specifically, the second air guide plate 3120 with an inverted U-shaped structure can effectively cover the top of the smoke inlet 3101. The second air guide plate 3120 forms a buffer zone for the smoke to enter the heat exchange shell 3100. In addition, the second ventilation hole 3121 formed on one side of the second air guide plate 3120 is adjacent to the heat exchange tube 3200, which can ensure that the output smoke directly enters the area where the heat exchange tube 3200 is located, thereby improving the heat exchange efficiency.

[0084] In one embodiment, the smoke inlet 3101 is located below the fixed end of the first air guide plate 3110 , and the second air guide plate 3120 covers the smoke inlet 3101 .

[0085] Specifically, the smoke output from the second ventilation hole 3121 will be transported toward the flange structure 3111, and during the transportation process, the smoke rises and flows onto the first air guide plate 3110, and the smoke is guided by the inclined first air guide plate 3110, thereby ensuring that the smoke can evenly exchange heat with the heat exchange tube 3200 and ensure that the smoke flows smoothly in the heat exchange shell 3100, so as to reduce the influence of wind resistance and ensure smooth smoke exhaust.

[0086] In one embodiment of the present application, an air collecting hood 3300 is further included. A connecting port 3301 is provided on the top of the air collecting hood 3300 . The air collecting hood 3300 is disposed at the bottom of the heat exchange shell 3100 . The connecting port 3301 is connected to the smoke inlet 3101 .

[0087] Specifically, in order to better collect the smoke generated by the combustion chamber in the gas water heater, an air collecting hood 3300 is configured at the bottom of the heat exchange shell 3100. The air collecting hood 3300 can better cooperate with the top of the combustion chamber to collect the smoke and guide the smoke into the heat exchange shell 3100.

[0088] Compared with the prior art, the advantages and positive effects of the present invention are: a first air guide plate is arranged in the heat exchange shell to shield the bottom of the smoke outlet, and a flange structure is also arranged on the first air guide plate. During use, the smoke enters the heat exchange shell through the smoke inlet and contacts and exchanges heat with the heat exchange tube below the first air guide plate. During the rising process, the smoke is restricted by the first air guide plate and cannot continue to rise and is further restricted by the flange structure, so that the smoke has a tendency to flow downward in the heat exchange shell. In this way, the smoke can fully exchange heat with the heat exchange tube below the first air guide plate, so as to improve the heat exchange efficiency of the heat exchanger and reduce the energy consumption of the gas water heater.

[0089] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for a person skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to replace some of the technical features therein by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions claimed to be protected by the present invention.

Claims

1. A control method for a zero-cold-water gas water heater, wherein the zero-cold-water gas water heater is provided with a water inlet pipe, a water outlet pipe and a zero-cold-water pipe, wherein a heat exchanger of the zero-cold-water gas water heater is connected to the water outlet pipe through a return pipe, the heat exchanger is connected to the water inlet pipe and the zero-cold-water pipe through a circulation pump, and a bypass pipe is provided between the return pipe and the circulation pump, wherein: The control method comprises: During the process of powering on and using water, after the water use is suspended, when the water use suspension time is greater than the first time length t1, the circulation pump is started to allow the water stored in the zero cold water gas water heater to circulate between the water inlet pipe, the heat exchanger and the water outlet pipe.

2. The control method of the zero-cold-water gas water heater according to claim 1, characterized in that: After the water use suspension time is longer than the first time t1, the circulation pump is started; after the circulation pump is started and runs for longer than the second time t2, the circulation pump stops running.

3. The control method of the zero-cold-water gas water heater according to claim 1, characterized in that: The control method further comprises: After the water use suspension time is greater than the first time t1, the flow path of the bypass pipe is first closed and the flow path between the zero cooling water pipe and the circulation pump is opened. After the circulating pump starts running for a time greater than the third time t3, the flow path of the bypass pipe is opened and the flow path between the zero cooling water pipe and the circulation pump is closed.

4. The control method of the zero-cold-water gas water heater according to claim 3, characterized in that: If the outlet water temperature of the heat exchanger is lower than the set circulating water temperature T1, the circulating pump stops running.

5. The control method of the zero-cold-water gas water heater according to claim 4, characterized in that: After the circulating pump starts running for a period longer than the second time period t2, if the outlet water temperature of the heat exchanger is higher than the set circulating water temperature T1; the flow path of the bypass pipe is closed again and the flow path between the zero cooling water pipe and the circulating pump is opened; after the circulating pump starts running for a period longer than the fourth time period t4, the flow path of the bypass pipe is opened again and the flow path between the zero cooling water pipe and the circulating pump is closed; Among them, t4 <t3。 6. A zero cold water gas water heater, characterized in that: The zero-cold-water gas water heater implements the control method of the zero-cold-water gas water heater according to any one of claims 1 to 5; The zero cold water gas water heater comprises: The shell is provided with a zero-cold water pipe; A burner, the burner is used to burn gas; A heat exchanger, wherein the heat exchanger is used for water flow heat exchange; The water inlet and outlet assembly includes a circulation pump, a first electric control valve, a water inlet pipe, a water outlet pipe, a water return pipe and a bypass pipe. The inlet of the circulation pump is connected to the water inlet pipe, the bypass pipe is connected between the return pipe and the inlet of the circulation pump, the outlet pipe is connected to the return pipe, and the first electrically controlled valve is configured to control the return pipe to selectively communicate with the bypass pipe; Wherein, the outlet of the circulation pump is connected to the inlet of the heat exchanger, the outlet of the heat exchanger is connected to the return pipe, and the zero cooling water pipe is connected to the inlet of the circulation pump.

7. The zero cold water gas water heater according to claim 6, characterized in that: A multi-way connector is provided on the inlet of the circulation pump, and the multi-way connector has a first interface, a second interface, a third interface and a fourth interface, the first interface is connected to the inlet of the circulation pump, the second interface is connected to the water inlet pipe, the third interface is connected to the bypass pipe; the fourth interface is connected to the zero cooling water pipe; Wherein, a second electrically-controlled valve is arranged between the water inlet pipe and the second interface, and a third electrically-controlled valve is arranged between the zero-cooling water pipe and the fourth interface.

8. The zero cold water gas water heater according to claim 6, characterized in that: The heat exchanger comprises: A heat exchange shell, wherein a smoke inlet and a smoke outlet are arranged on the heat exchange shell, a first air guide plate is arranged in the heat exchange shell, the first air guide plate covers below the smoke outlet, a gap is formed between the first air guide plate and the smoke outlet, a fixed end of the first air guide plate is arranged on the inner wall of the heat exchange shell, and a free end of the first air guide plate is arranged with a flange structure extending downward; A heat exchange tube, wherein the heat exchange tube is arranged in the heat exchange shell, the heat exchange tube is located below the first air guide plate, one pipe opening of the heat exchange tube is connected to the outlet of the circulation pump, and the other pipe opening of the heat exchange tube is connected to the return pipe; a second air guide plate is arranged in the heat exchange shell, the second air guide plate covers above the smoke inlet and is located below the first air guide plate, a plurality of second ventilation holes are arranged on the second air guide plate, and the heat exchange tube is located between the second air guide plate and the flange structure.

9. The zero cold water gas water heater according to claim 6, characterized in that: The heat exchanger comprises: A plurality of heat exchange tubes, wherein the heat exchange tubes are flat tubes, and the plurality of heat exchange tubes are arranged side by side, and the flat surfaces of two adjacent heat exchange tubes are arranged opposite to each other; A plurality of heat exchange fins, each of which is provided with a plurality of assembly holes, and a surface of each heat exchange fin is further provided with an air spoiler component, wherein the air spoiler component is arranged between two adjacent assembly holes, and a plurality of heat exchange fins are arranged side by side; Wherein, a plurality of the heat exchange tubes are interconnected to form a water flow channel, the heat exchanger further comprises an inlet pipe and an outlet pipe, and the water flow channel is connected between the inlet pipe and the outlet pipe; The heat exchange tube is installed in the assembly hole, the inlet pipe is connected to the outlet of the circulation pump, and the outlet pipe is connected to the return water pipe.

10. The zero cold water gas water heater according to claim 6, characterized in that: A one-way valve is provided between the first electrically controlled valve and the bypass pipe, and the one-way valve is configured to restrict the water in the bypass pipe from flowing toward the circulation pump in one direction.

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