A dual combustion heat exchange gas water heater

Abstract

The present application belongs to the technical field of gas water heater, and discloses a double combustion heat exchange gas water heater, which comprises a first combustion heat exchange chamber and a second combustion heat exchange chamber arranged independently, a water inlet pipe, a hot water outlet pipe, a heating water pipe and a first heating return water pipe, the first combustion heat exchange chamber is provided with a first heat exchange pipe, the second combustion heat exchange chamber is provided with a second heat exchange pipe, one end of the water inlet pipe is connected with a cold water source, and the other end can switch and conduct the first heat exchange pipe or the second heat exchange pipe, the hot water outlet pipe is connected with the output end of the second heat exchange pipe to provide hot water, the heating water pipe is connected between the first heat exchange pipe and a heating terminal, and the first heating return water pipe is connected between the heating terminal and the water inlet pipe. The present application can separately provide heating water and hot water, meets the demand of users on the gas water heater with both hot water and heating, and expands the application range of the gas water heater; one water inlet pipe switches and conducts the first heat exchange pipe and the second heat exchange pipe, and the structure is simple, which greatly simplifies the pipeline setting.

Description

Technical Field

[0001] This invention relates to the field of gas water heater technology, and more particularly to a gas water heater with dual combustion heat exchange. Background Technology

[0002] Wall-hung boilers are a common household gas appliance that can provide both heating and hot water. However, due to their complex structure, bulky size, and high price, a dual-purpose gas water heater that combines heating and hot water supply has emerged in the industry. Compared to traditional wall-hung boilers, this type of water heater is lighter and easier to use. However, the piping system of this dual-purpose gas water heater is still relatively complex, which can cause many inconveniences during installation. Summary of the Invention

[0003] The technical problem solved by this invention is to provide a gas water heater with dual combustion heat exchange, which can effectively solve the problem of gas water heaters being able to provide both heating and hot water, while also having the advantage of simple pipeline structure.

[0004] The above-mentioned technical problems are solved by the following technical solutions:

[0005] A gas water heater with dual combustion heat exchange, comprising:

[0006] The first combustion heat exchange chamber is provided with a first heat exchange tube;

[0007] The second combustion heat exchange chamber is equipped with a second heat exchange tube; the first combustion heat exchange chamber and the second combustion heat exchange chamber are set up independently.

[0008] The water inlet pipe has one end connected to a cold water source and the other end capable of switching between the first heat exchange pipe and the second heat exchange pipe.

[0009] A hot water outlet pipe is connected to the output end of the second heat exchange tube to provide hot water;

[0010] A heating water pipe, the two ends of which are respectively connected to the first heat exchange pipe and the inlet of the heating terminal, and provide heating water to the heating terminal;

[0011] The first heating return pipe has its two ends connected to the outlet end of the heating terminal and the inlet pipe, respectively.

[0012] The dual-combustion heat exchange gas water heater of the present invention has the following advantages compared with the prior art:

[0013] The gas water heater of the present invention with dual combustion heat exchange has two separate first combustion heat exchange chambers and second combustion heat exchange chambers separated by a heat insulation plate. They can provide heating water and hot water separately, respectively, to meet users' needs for gas water heaters to provide both hot water and heating, thus expanding the application range of gas water heaters. By setting a single water inlet pipe, the first heat exchange pipe or the second heat exchange pipe can be switched. The structure is simple, greatly simplifying the pipeline setup and facilitating pipeline installation.

[0014] In one embodiment, the first combustion heat exchange chamber and the second combustion heat exchange chamber are arranged side by side, and the water inlet pipe is arranged between the first combustion heat exchange chamber and the second combustion heat exchange chamber.

[0015] In one embodiment, the water inlet pipe is provided with a first reversing valve, the inlet of the first reversing valve is connected to the water inlet pipe, and the two outlets are respectively connected to the first heat exchange pipe and the second heat exchange pipe.

[0016] In one embodiment, the water inlet pipe includes a cold water inlet section and a circulating water supply section, and the connection node between the first heating return water pipe and the water inlet pipe is located between the cold water inlet section and the circulating water supply section.

[0017] In one embodiment, the water inlet pipe is provided with a first circulation pump and a first on / off valve, the first circulation pump being located in the circulating water delivery section and the first on / off valve being located in the cold water inlet section.

[0018] In one embodiment, a first temperature sensor and a first flow sensor are provided on the circulating water section;

[0019] And / or, the heating water pipe is equipped with a first one-way valve, a second temperature sensor, and a second flow sensor; the first one-way valve can unidirectionally guide the heating water from the first heat exchange pipe to the heating terminal;

[0020] And / or, a third temperature sensor is provided on the hot water outlet pipe.

[0021] In one embodiment, the first heating return water pipe is provided with a second one-way valve and a second on / off valve. The second one-way valve can unidirectionally guide the heating water back from the heating terminal to the inlet pipe.

[0022] In one embodiment, the dual-combustion heat exchange gas water heater further includes a second heating return pipe, one end of which is connected to the hot water outlet pipe via a second reversing valve, and the other end is connected to the circulating water supply section.

[0023] In one embodiment, the second heating return water pipe is equipped with a second circulation pump and a third one-way valve, the third one-way valve being able to unidirectionally guide the preheated heating hot water from the hot water outlet pipe to the inlet pipe.

[0024] In one embodiment, the dual-combustion heat exchange gas water heater further includes a flue gas system that connects the first combustion heat exchange chamber and the second combustion heat exchange chamber. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the structure of a gas water heater with dual combustion heat exchange provided in Embodiment 1 of the present invention;

[0026] Figure 2 This is a schematic diagram of the structure of a gas water heater with dual combustion heat exchange provided in Embodiment 2 of the present invention.

[0027] In the picture:

[0028] 1. First combustion heat exchange chamber; 11. First heat exchange tube;

[0029] 2. Second combustion heat exchange chamber; 21. Second heat exchange tube;

[0030] 3. Inlet pipe; 31. First circulation pump; 32. First temperature sensor; 33. First flow sensor; 34. First on / off valve; 35. First directional valve;

[0031] 4. Hot water outlet pipe; 41. Third temperature sensor;

[0032] 5. Heating water pipe; 51. First check valve; 52. Second temperature sensor; 53. Second flow sensor;

[0033] 6. Heating terminals;

[0034] 7. First heating return pipe; 71. Second check valve; 72. Second on / off valve;

[0035] 8. Second heating return pipe; 81. Second reversing valve; 82. Second circulating pump; 83. Third check valve; 84. Fourth temperature sensor;

[0036] 9. Smoke exhaust system. Detailed Implementation

[0037] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0038] In the description of this invention, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0039] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0040] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0041] Example 1:

[0042] like Figure 1 As shown, the gas water heater with dual combustion heat exchange provided by the present invention includes a first combustion heat exchange chamber 1, a second combustion heat exchange chamber 2, an inlet pipe 3, a hot water outlet pipe 4, a heating water pipe 5, and a first heating return pipe 7. The first combustion heat exchange chamber 1 is provided with a first heat exchange pipe 11; the second combustion heat exchange chamber 2 is provided with a second heat exchange pipe 21; the first combustion heat exchange chamber 1 and the second combustion heat exchange chamber 2 are independently set, and a heat insulation plate can be set between them; one end of the inlet pipe 3 is connected to a cold water source, and the other end can switch to conduct either the first heat exchange pipe 11 or the second heat exchange pipe 21; the hot water outlet pipe 4 is connected to the output end of the second heat exchange pipe 21 to provide hot water; the two ends of the heating water pipe 5 are respectively connected to the inlet end of the first heat exchange pipe 11 and the heating terminal 6 and provide heating water to the heating terminal 6; the two ends of the first heating return pipe 7 are respectively connected to the outlet end (also called the return end) of the heating terminal 6 and the inlet pipe 3.

[0043] This embodiment of a dual-combustion heat exchange gas water heater, compared with the prior art, utilizes a heat insulation plate to separate the combustion heat exchange chamber to obtain two independent first combustion heat exchange chamber 1 and second combustion heat exchange chamber 2, each having a separate gas combustion chamber and heat exchange chamber. The first combustion heat exchange chamber 1 is used solely for heating to provide heating water, and the second combustion heat exchange chamber 2 is used solely for heating cold water to provide hot water (such as hot water for showering). Figure 1 Heating is supplied on the left and hot water on the right, meeting users' needs for gas water heaters to provide both hot water and heating, thus expanding the application range of gas water heaters. The first combustion heat exchange chamber 1 and the second combustion heat exchange chamber 2 share a single inlet pipe 3. The inlet pipe 3 switches between the first heat exchange tube 11 and the second heat exchange tube 21 to meet the heating and hot water needs of different users, and the simple pipe structure greatly simplifies the pipe layout.

[0044] In one embodiment, the first combustion heat exchange chamber 1 and the second combustion heat exchange chamber 2 are arranged side by side, and the water inlet pipe 3 is arranged between the first combustion heat exchange chamber 1 and the second combustion heat exchange chamber 2.

[0045] like Figure 1 As shown, the water inlet pipe 3 is located on the central axis between the first combustion heat exchange chamber 1 and the second combustion heat exchange chamber 2. The first and second combustion heat exchange chambers 1 and 2 are separated into two independent spaces by a heat insulation plate according to the heat exchange power requirements. The first and second combustion heat exchange chambers 1 and 2 are arranged side-by-side, sharing the same water inlet pipe 3. The pipe structure is simple and occupies little space overall. Preferably, the first combustion heat exchange chamber 1 is used for heating, and the second combustion heat exchange chamber 2 is used for hot water supply. Therefore, the combustion power of the first combustion heat exchange chamber 1 is less than that of the second combustion heat exchange chamber 2, so that the gas water heater can provide instant hot water.

[0046] In one embodiment, the water inlet pipe 3 is provided with a first reversing valve 35, the inlet of the first reversing valve 35 is connected to the water inlet pipe 3, and the two outlets are respectively connected to the first heat exchange pipe 11 and the second heat exchange pipe 21.

[0047] Preferably, the first reversing valve 35 is an electric three-way valve, with its three ports connected to the water inlet pipe 3, the first heat exchange pipe 11, and the second heat exchange pipe 21, respectively. The first reversing valve 35 is connected to a controller to achieve remote or automatic control. The water inlet pipe 3 connected to the first heat exchange pipe 11 can supply cold water (i.e., the user's incoming water) to the first combustion heat exchange chamber 1 to meet the heating needs. The water inlet pipe 3 connected to the second heat exchange pipe 21 can supply cold water to the second combustion heat exchange chamber 2 to meet the hot water needs. The first heat exchange pipe 11 and the second heat exchange pipe 21 are independent of each other and do not affect each other. The gas water heater can provide heating to bathrooms, etc., and does not affect the normal use of the gas water heater when heating is not needed. The switching and conduction are achieved through the first reversing valve 35. The pipeline structure is simple and easy to install.

[0048] In one embodiment, the inlet pipe 3 includes a cold water inlet section and a circulating water supply section, and the connection node between the first heating return pipe 7 and the inlet pipe 3 is located between the cold water inlet section and the circulating water supply section.

[0049] like Figure 1 As shown, the section below the connection node between the first heating return pipe 7 and the inlet pipe 3 (i.e., the inlet pipe 3 between the user's water inlet and the connection node) is the cold water inlet section, and the section above the connection node (i.e., the inlet pipe 3 between the connection node and the first reversing valve 35) is the circulating water supply section. The circulating water supply section, the first heat exchange pipe 11, the heating water pipe 5, the heating terminal 6, and the first heating return pipe 7 are connected end to end to form a heating circulation loop. It can be understood that when the gas water heater switches from heating mode to hot water mode, the circulating water supply section contains high-temperature heating water. After the cold water from the cold water inlet section enters the circulating water supply section, it can neutralize and cool the high-temperature heating water in the circulating water supply section, preventing the high-temperature hot water output from the hot water outlet pipe 4 from scalding the user at the beginning of the opening.

[0050] In one embodiment, the water inlet pipe 3 is provided with a first circulation pump 31 and a first on / off valve 34. The first circulation pump 31 is located in the circulating water delivery section, and the first on / off valve 34 is located in the cold water inlet section.

[0051] For example Figure 1 The first circulation pump 31 provides power to the heating circulation loop and also serves as the pumping power for cold water in the inlet pipe 3 and hot water in the outlet pipe 4, facilitating the smooth entry of cold water into the first heat exchange tube 11 or the second heat exchange tube 21 for replenishment. The first circulation pump 31 is connected to a controller for remote control or adjustment. In heating mode, the first on-off valve 34 can cut off the inlet pipe 3 to allow circulation of heating hot water. In hot water supply mode, the first on-off valve 34 can open the inlet pipe 3 to provide a continuous water source for the second heat exchange tube 21.

[0052] In some embodiments, a first temperature sensor 32 and a first flow sensor 33 are provided on the circulating water section of the water inlet pipe 3;

[0053] And / or, the heating water pipe 5 is equipped with a first one-way valve 51, a second temperature sensor 52 and a second flow sensor 53. The first one-way valve 51 can unidirectionally guide the heating water from the first heat exchange pipe 11 to the heating terminal 6.

[0054] And / or, a third temperature sensor 41 is provided on the hot water outlet pipe 4.

[0055] The first temperature sensor 32 is used to detect the temperature of the cold water in the inlet pipe 3, so that the first combustion heat exchange chamber 1 can supply heat to the bathroom at a set temperature. The first flow sensor 33 is used to detect the flow rate or pressure of the cold water in the inlet pipe 3 to ensure the normal operation of the heating mode.

[0056] The first one-way valve 51 ensures that the heating water flows out of the first heat exchange tube 11 in one direction. The second temperature sensor 52 is used to detect the temperature of the heating water. By comparing the data detected by the first temperature sensor 32, it is convenient to automatically control and adjust the combustion efficiency of the first combustion heat exchange chamber 1. The second flow sensor 53 is used to detect the flow rate of the heating water to ensure that the required functional effects are provided.

[0057] The third temperature sensor 41 is used to detect the user's hot water temperature so that the hot water temperature can be displayed to the user intuitively, avoiding scalding from hot water or using cold water, and improving the user experience.

[0058] When the gas water heater with dual combustion heat exchange provided in Embodiment 1 of this invention is activated in heating mode, the first reversing valve 35 opens the heating circulation loop, connecting the inlet pipe 3 and the first heat exchange pipe 11, and the system begins to heat the bathroom. The first circulation pump 31 starts, and the system enters the internal circulation mode. At this time, the system rapidly heats the bathroom at maximum load; this stage is the rapid heating stage. After a period of rapid heating, the system begins to reduce its workload, and the first temperature sensor 32 monitors the return water temperature to ensure that the system heats the bathroom at the set temperature. The second temperature sensor 52 and the second flow sensor 53 on the heating water pipe 5 can monitor the temperature, flow rate, or pressure of the heating water in real time to ensure the normal operation of the heating system.

[0059] When the hot water supply mode is activated, the first reversing valve 35 switches, shutting off the left-side heating system and activating the right-side hot water supply system, thus beginning the supply of hot water. The dual-combustion heat exchange gas water heater provided by this invention, when not in heating mode during the summer, can function like a typical gas water heater that only supplies hot water, ensuring that all functions are available without affecting user experience.

[0060] In one embodiment, the first heating return water pipe 7 is provided with a second one-way valve 71 and a second on / off valve 72. The second one-way valve 71 can unidirectionally guide the heating water from the heating terminal 6 back to the inlet pipe 3.

[0061] like Figure 1 As shown, the second one-way valve 71 ensures unidirectional flow of circulating heating water in the first heating return pipe 7, and the second on-off valve 72 is in the open state. In hot water supply mode, the second on-off valve 72 is closed, cutting off the connection between the first heating return pipe 7 and the inlet pipe 3. It should be noted that after the inlet pipe 3 provides sufficient water to the heating water pipe 5 and the first heating return pipe 7, the first on-off valve 34 is disconnected to facilitate the formation of a heating circulation loop and improve the heating effect.

[0062] In this embodiment, by connecting the first heating return pipe 7 to the inlet pipe 3, the high-temperature heating water in the first heating return pipe 7 is effectively utilized. This high-temperature heating water can preheat the cold water in the inlet pipe 3, avoiding the waste of cold water being released from the hot water outlet pipe 4 before hot water is dispensed, and also saving heat exchange efficiency in the second combustion heat exchange chamber 2, thus saving energy. However, it is necessary to avoid the situation where the high-temperature heating water remains at a high temperature after being mixed with the cold water, to prevent scalding of users. The second on / off valve 72 can be closed when the heating water temperature or flow rate decreases to a set value, so as to maximize the utilization of heating water and achieve energy recovery.

[0063] Example 2:

[0064] Based on the dual-combustion heat exchange gas water heater provided in Embodiment 1, the dual-combustion heat exchange gas water heater provided in this embodiment further includes a second heating return pipe 8, such as... Figure 2 One end of the second heating return water pipe 8 is connected to the hot water pipe 4 through the second reversing valve 81, and the other end is connected to the inlet pipe 3 and connected to the inlet side of the first circulating pump 31, that is, connected to the circulating water section.

[0065] like Figure 2 As shown, the second reversing valve 81 is a solenoid valve, connected to the controller for automatic control. The inlet and one outlet of the second reversing valve 81 are connected to the hot water outlet pipe 4, and the other outlet is connected to the circulating water section, allowing it to switch between the hot water outlet pipe 4 and the second heating return pipe 8. The second heating return pipe 8 provides a rapid heating mode for the dual-combustion heat exchange gas water heater. In rapid heating mode, cold water enters from the inlet pipe 3. The first reversing valve 35 connects the inlet pipe 3 and the second heat exchange pipe 21, while the second reversing valve 81 connects the hot water outlet pipe 4 and the second heating return pipe 8. After being heated to a preset temperature through heat exchange circulation in the second combustion heat exchange chamber 2 via the second heat exchange pipe 21, preheated heating hot water is obtained. Then, the first reversing valve 35 switches to connect the inlet pipe 3 and the first heat exchange pipe 11, and the preheated heating hot water is reheated a second time in the first combustion heat exchange chamber 1 to become high-temperature heating water. The high-temperature heating water flows out through the heating water pipe 5 and is supplied to the heating terminal 6. It is understood that the thermal efficiency of the first combustion heat exchange chamber 1 provided by the present invention is lower than that of the second combustion heat exchange chamber 2. Therefore, when rapid heating is required, the second combustion heat exchange chamber 2 is used to heat the cold water first, which can improve the heating efficiency.

[0066] It should be noted that, in this embodiment, in order to optimize the pipeline setup, the first reversing valve 35 is located at the top between the first combustion heat exchange chamber 1 and the second combustion heat exchange chamber 2, so as to form the shortest first heat exchange pipe 11 and second heat exchange pipe 21. During the preheating process, the first circulation pump 31 is used to provide sufficient water inlet power to the second heating return water pipe 8, and the second circulation pump 82 provides circulation power to obtain preheated heating hot water at the preset temperature.

[0067] In one embodiment, a third one-way valve 83 is also provided on the second heating return water pipe 8. The third one-way valve 83 can unidirectionally guide the preheated heating hot water from the hot water outlet pipe 4 to the inlet water pipe 3 in the circulation section, thereby ensuring the unidirectional flow of the preheated heating hot water in the second heating return water pipe 8. Preferably, a fourth temperature sensor 84 is provided on the second heating return water pipe 8 or on the inlet water pipe 3 between the first circulation pump 31 and the first reversing valve 35, for detecting the temperature of the preheated heating hot water to control the switching direction of the first reversing valve 35. In this invention, all control lines used for electrical connection are connected to the controller to achieve monitoring and control.

[0068] The gas water heaters with dual combustion heat exchange provided in Embodiment 1 and Embodiment 2 above both include a flue gas system 9, which is connected to the first combustion heat exchange chamber 1 and the second combustion heat exchange chamber 2.

[0069] like Figure 1 and Figure 2 In the gas water heater with dual combustion heat exchange provided in Embodiment 1 and Embodiment 2, the first combustion heat exchange chamber 1 and the second combustion heat exchange chamber 2 share a common exhaust system 9. The exhaust port of the exhaust system 9 is located in the middle of the top of the first combustion heat exchange chamber 1 and the second combustion heat exchange chamber 2 for common exhaust. The fan is connected to both the first combustion heat exchange chamber 1 and the second combustion heat exchange chamber 2 for common use.

[0070] This invention, by setting up a second heating return water pipe 8, can provide sufficient heat load to the hot water at the start of heating, achieving the purpose of rapid heating. Moreover, since the hot water outlet pipe 4 and the heating water pipe 5 are independent of each other, the contradiction between high heating temperature and bathing temperature can be effectively resolved.

[0071] In the specific implementation of the above embodiments, the technical features can be combined in any non-contradictory way. For the sake of brevity, not all possible combinations of the above technical features are described. However, as long as the combination of these technical features is not contradictory, it should be considered to be within the scope of this specification.

[0072] The specific embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are detailed, they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention. Therefore, the scope of protection of this patent should be determined by the appended claims.

Claims

1. A gas water heater with dual combustion heat exchange, characterized in that, include: The first combustion heat exchange chamber (1) is provided with a first heat exchange tube (11); The second combustion heat exchange chamber (2) is provided with a second heat exchange tube (21); the first combustion heat exchange chamber (1) and the second combustion heat exchange chamber (2) are respectively set independently; Water inlet pipe (3), one end of which is connected to a cold water source, and the other end can switch to conduct the first heat exchange pipe (11) or the second heat exchange pipe (21); Hot water outlet pipe (4) is connected to the output end of the second heat exchange pipe (21) to provide hot water; Heating water pipe (5), the two ends of which are respectively connected to the inlet of the first heat exchange pipe (11) and the heating terminal (6) and provide heating water to the heating terminal (6); The first heating return pipe (7) is connected at both ends to the outlet end of the heating terminal (6) and the inlet pipe (3), respectively. The first combustion heat exchange chamber (1) and the second combustion heat exchange chamber (2) are arranged side by side, and the water inlet pipe (3) is arranged between the first combustion heat exchange chamber (1) and the second combustion heat exchange chamber (2); The inlet pipe (3) includes a cold water inlet section and a circulating water supply section, and the connection node between the first heating return pipe (7) and the inlet pipe (3) is located between the cold water inlet section and the circulating water supply section; When the gas water heater switches from heating mode to hot water mode, the circulating water section contains high-temperature heating water, and the cold water from the cold water inlet section enters the circulating water section and is neutralized and cooled by the high-temperature heating water in the circulating water section.

2. The gas water heater with dual combustion heat exchange according to claim 1, characterized in that, The water inlet pipe (3) is provided with a first reversing valve (35). The inlet of the first reversing valve (35) is connected to the water inlet pipe (3), and the two outlets are connected to the first heat exchange pipe (11) and the second heat exchange pipe (21) respectively.

3. The gas water heater with dual combustion heat exchange according to claim 1, characterized in that, The water inlet pipe (3) is equipped with a first circulation pump (31) and a first on / off valve (34). The first circulation pump (31) is located in the circulating water delivery section, and the first on / off valve (34) is located in the cold water inlet section.

4. The gas water heater with dual combustion heat exchange according to claim 1, characterized in that, The circulating water conveyance section is equipped with a first temperature sensor (32) and a first flow sensor (33); And / or, the heating water pipe (5) is provided with a first one-way valve (51), a second temperature sensor (52) and a second flow sensor (53); the first one-way valve (51) can unidirectionally guide the heating water from the first heat exchange pipe (11) to the heating terminal (6). And / or, a third temperature sensor (41) is provided on the hot water outlet pipe (4).

5. The gas water heater with dual combustion heat exchange according to claim 4, characterized in that, The first heating return water pipe (7) is equipped with a second one-way valve (71) and a second on / off valve (72). The second one-way valve (71) can unidirectionally guide the heating water from the heating terminal (6) back to the inlet pipe (3).

6. The gas water heater with dual combustion heat exchange according to claim 1, characterized in that, It also includes a second heating return water pipe (8), one end of which is connected to the hot water outlet pipe (4) through a second reversing valve (81), and the other end is connected to the circulating water section.

7. The gas water heater with dual combustion heat exchange according to claim 6, characterized in that, The second heating return water pipe (8) is equipped with a second circulation pump (82) and a third one-way valve (83). The third one-way valve (83) can unidirectionally guide the preheated heating hot water from the hot water outlet pipe (4) to the water inlet pipe (3).

8. The gas water heater with dual combustion heat exchange according to claim 1, characterized in that, It also includes a smoke exhaust system (9), which is connected to the first combustion heat exchange chamber (1) and the second combustion heat exchange chamber (2).

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