Gas water heater and control method therefor

Abstract

The present application relates to the technical field of heat supply, and specifically discloses a gas water heater and a control method therefor. The gas water heater comprises a burner and a water inlet pipe, a heat exchanger and a water outlet pipe which are communicated in sequence. The water outlet pipe comprises a first water outlet section and a second water outlet section. The gas water heater further comprises a water tank and a bypass pipe; the water tank is provided with a first water inlet, a second water inlet, a water outlet, a flow baffle structure and a flow disturbing structure; the first water outlet section is communicated with the first water inlet; the second water outlet section is communicated with the water outlet; the second water inlet is located between the first water inlet and the water outlet; the flow baffle structure is located between the first water inlet and the second water inlet; and the flow disturbing structure is located between the flow baffle structure and the water outlet. The bypass pipe has one end communicated with the water inlet pipe and the other end communicated with the second water inlet; and the bypass pipe is provided with a water volume adjustment mechanism. The present application can effectively solve the problem of a large temperature difference between two consecutive water outputs during a secondary startup process of the gas water heater.

Description

Gas water heaters and their control methods

[0001] This application claims priority to Chinese Patent Application No. 202410793976.2, filed on June 19, 2024, entitled “Gas Water Heater and Control Method Thereof”, the entire contents of which are incorporated herein by reference. Technical Field

[0002] This application relates to the field of heating technology, and in particular to a gas water heater and its control method. Background Technology

[0003] Existing gas water heaters typically include an inlet pipe, a heat exchanger, and an outlet pipe connected in sequence. The inlet pipe is equipped with a flow sensor. When a user turns on the shower or faucet to use the gas water heater, the water heater usually detects a certain water flow through the flow sensor before igniting to heat the heat exchanger. Therefore, there is a certain time difference when the gas water heater starts up, resulting in some water not being fully heated.

[0004] When users need to pause the use of a gas water heater, such as to turn off the water to apply shower gel, the water in the heat exchanger will be further heated by the residual heat during the pause, causing the water temperature in that part to be too high. When the user restarts the gas water heater, due to the time difference during startup, some water will not be fully heated. Therefore, when the user restarts the gas water heater a second time, they will encounter two consecutive periods of excessively high and low water temperatures, that is, they will experience two periods of extremely large temperature differences before returning to the preset temperature, resulting in a poor user experience. Summary of the Invention

[0005] One of the technical problems addressed by this application is to provide a gas water heater that can effectively solve the problem of a large temperature difference between the two consecutive water outlets when the gas water heater is restarted.

[0006] The second technical problem addressed by this application is to provide a control method for a gas water heater that can effectively solve the problem of excessive fluctuations in the outlet water temperature of a gas water heater.

[0007] The first technical problem mentioned above is solved by the following technical solution:

[0008] A gas water heater includes a burner and an inlet pipe, a heat exchanger, and an outlet pipe connected in sequence. The burner is capable of supplying heat to the heat exchanger. The inlet pipe is equipped with a flow sensor. The outlet pipe includes a first outlet section and a second outlet section. The gas water heater also includes:

[0009] A water tank is provided with a first inlet, a second inlet, an outlet, a flow-slowing structure, and a flow-turbulence structure. The first outlet section is connected to the first inlet, the second outlet section is connected to the outlet, the second inlet is located between the first inlet and the outlet, the flow-slowing structure is located between the first inlet and the second inlet, and the flow-turbulence structure is located between the flow-slowing structure and the outlet.

[0010] A bypass pipe, one end of which is connected to the inlet pipe and the other end of which is connected to the second inlet, is provided with a water flow regulating mechanism.

[0011] The gas water heater described in this application has the following advantages compared with the prior art:

[0012] This application, by setting up a water tank and a bypass pipe, allows the water tank located between the second and first inlets to receive water output from the heat exchanger through the first outlet section to the first inlet. This enables the two sections of water with a large temperature difference output from the heat exchanger to mix within the water tank between the second and first inlets during the second start-up of the gas water heater. The superheated water compensates for the insufficiently heated water, reducing the temperature difference between the two outlet sections. Furthermore, the bypass pipe allows some cold water from the inlet pipe to flow directly into the water tank near the second inlet, mixing with the hot water entering the area between the second and first inlets to achieve a preset temperature. This requires the heat exchanger to heat the water flowing through it to a temperature higher than the preset temperature. Consequently, during the second start-up of the gas water heater, the superheated water stores more heat to compensate for the insufficiently heated water.

[0013] Furthermore, by installing a flow-retarding structure within the tank between the second and first inlets, the water flowing from near the first inlet to near the second inlet is partially obstructed. This prevents hot water near the first inlet from rapidly flowing towards the second inlet to mix with the cold water output from the second inlet. Consequently, the hot water remains between the first inlet and the flow-retarding structure for a longer period, storing its heat to compensate for any underheated water. Moreover, by installing a turbulence-inducing structure within the tank between the flow-retarding structure and the outlet, the cold water entering the tank through the bypass pipe from the flow-retarding structure mixes more thoroughly with the hot water flowing from the first inlet to near the second inlet. This further reduces temperature fluctuations in the water transported from the flow-retarding structure and the outlet to the second outlet section and output to the gas water heater.

[0014] In one embodiment, the water tank has a connected energy storage chamber and a mixing chamber. The energy storage chamber is connected to the first water inlet, and the mixing chamber is connected to the second water inlet and the water outlet. The slow-flow structure has a narrowing section located between the energy storage chamber and the mixing chamber. The cross-sectional area of ​​the narrowing section is smaller than the cross-sectional area of ​​the energy storage chamber.

[0015] In one embodiment, the slow-flow structure includes a first baffle that divides the internal space of the water tank into the energy storage chamber and the mixing chamber. The first baffle is provided with a plurality of first through holes at intervals, which connect the energy storage chamber and the mixing chamber. The plurality of first through holes constitute the narrowing portion.

[0016] In one embodiment, the turbulence structure includes a second baffle that divides the mixing chamber into a mixing area and a drainage area. The second baffle is provided with a plurality of second through holes at intervals. The bypass pipe and the energy storage chamber are both connected to the mixing area, and the second water outlet section is connected to the drainage area.

[0017] In one embodiment, the volume of the energy storage cavity is smaller than the volume of the mixing cavity.

[0018] In one embodiment, the water tank has sequentially connected cavities arranged along the direction of gravity, and the energy storage cavity is located above the mixing cavity; and / or,

[0019] The turbulence structure includes a partition structure that divides the mixing chamber into a first chamber and a second chamber. The energy storage chamber and the bypass pipe are both connected to the first chamber. The partition structure is provided with a plurality of second turbulence holes at intervals, and the second turbulence holes are connected between the first chamber and the second chamber.

[0020] In one embodiment, the turbulence structure includes a turbulence cylinder, the interior of which is connected to the bypass pipe, and a plurality of first turbulence holes are spaced apart on the turbulence cylinder, the first turbulence holes being connected between the interior of the turbulence cylinder and the interior of the water tank.

[0021] In one embodiment, the water volume regulating mechanism is a water proportioning valve; or,

[0022] The water flow regulating mechanism is a three-way proportional valve. The water inlet pipe includes a first water inlet section and a second water inlet section. The water flow regulating mechanism is connected to the first water inlet section, the second water inlet section and the bypass pipe, respectively. The end of the second water inlet section away from the water flow regulating mechanism is connected to the heat exchanger.

[0023] In one embodiment, the water flow regulating mechanism is a switch valve, and the gas water heater includes multiple water flow regulating mechanisms, all of which are connected in parallel.

[0024] In one embodiment, the water volume regulating mechanism is a switch valve, and a bypass branch pipe is also provided on the bypass pipe, the bypass branch pipe being connected in parallel with at least one of the water volume regulating mechanisms.

[0025] In one embodiment, the bypass branch pipe has a first end and a second end opposite to each other, both of which are connected to the bypass pipe. The first end is close to the water tank, and the second end is close to the water inlet pipe. The water flow regulating mechanism is provided between the first end and the water tank, or the water flow regulating mechanism is provided between the second end and the water inlet pipe.

[0026] In one embodiment, the gas water heater further includes a first temperature sensor, a second temperature sensor, and a third temperature sensor. The first temperature sensor is located in the inlet pipe, the second temperature sensor is located in the first outlet section, and the third temperature sensor is located in the second outlet section. The water flow regulating mechanism, the first temperature sensor, the second temperature sensor, and the third temperature sensor are all communicatively connected to the main controller.

[0027] The second technical problem mentioned above is solved by the following first technical solution:

[0028] A method for controlling a gas water heater, using the gas water heater as described above, the method comprising:

[0029] Based on the request for hot water, determine whether the interval between the current time and the last time the water was cut off is less than a preset time;

[0030] If the interval time is less than the preset time, the water flow rate of the bypass pipe is reduced by controlling the water flow regulating mechanism.

[0031] The control method for gas water heaters described in this application has the following advantages compared with the prior art:

[0032] By reducing the water flow regulation mechanism when the interval between the current time of the hot water request and the last water outage time is less than a preset time, the flow rate of cold water delivered to the mixing chamber through the bypass pipe can be reduced when the gas water heater restarts for the second time within a preset time. This reduces the temperature drop after the hot and cold water in the mixing chamber mixes, which is less severe when the overall water temperature in the storage chamber drops during the second restart. As a result, the water temperature delivered from the mixing chamber to the second outlet section is more stable, further reducing the temperature fluctuation of the water output by the gas water heater.

[0033] The second technical problem mentioned above is solved by the following second technical solution:

[0034] A method for controlling a gas water heater, using the gas water heater as described above, the method comprising:

[0035] Based on the request for hot water, determine whether the interval between the current time and the last time the water was cut off is less than a preset time, or determine whether the current temperature drop in the water tank is greater than a preset temperature threshold.

[0036] If the interval is less than the preset time, or if the temperature drop in the current water tank is not greater than the preset temperature threshold, the water flow rate of the bypass pipe is reduced by controlling the water flow regulating mechanism.

[0037] The control method for gas water heaters described in this application has the following advantages compared with the prior art:

[0038] By reducing the water flow regulation mechanism when the interval between the current time of the hot water request and the last water outage time is less than a preset time, or when the temperature drop in the current water tank is not greater than a preset temperature threshold, the gas water heater can be restarted within a preset time. Alternatively, when the temperature drop in the water tank is not greater than a preset temperature threshold, the flow rate of cold water delivered to the mixing chamber through the bypass pipe can be reduced. This reduces the temperature drop after the hot and cold water in the mixing chamber mixes, even when the overall water temperature in the storage chamber drops during the second restart. This makes the water temperature delivered from the mixing chamber to the second outlet section more stable, further reducing the temperature fluctuation of the water output by the gas water heater.

[0039] The second technical problem mentioned above is solved by the following third technical solution:

[0040] A method for controlling a gas water heater, using the gas water heater as described above, the method comprising:

[0041] When the gas water heater is in combustion mode, the water flow rate of the bypass pipe is adjusted according to the current water flow rate;

[0042] If the flow sensor detects a decrease in the water flow rate in the inlet pipe, the water flow rate in the bypass pipe is increased by controlling the water flow regulating mechanism.

[0043] If the flow sensor detects an increase in the water flow rate in the inlet pipe, the water flow rate in the bypass pipe is reduced by controlling the water flow regulating mechanism.

[0044] The control method for gas water heaters described in this application has the following advantages compared with the prior art:

[0045] By increasing the flow rate adjustment mechanism when the flow sensor detects water flowing through the inlet pipe and detects a decrease in the water flow rate in the inlet pipe, the flow rate adjustment mechanism can increase the bypass ratio of cold water supplied to the mixing chamber through the bypass pipe. This is because the reduced water flow rate to the inlet pipe leads to an increase in the heat received per unit volume of water in the heat exchanger, which in turn causes the water temperature in the heat storage chamber to rise. This allows the superheated hot water output from the heat storage chamber to the mixing chamber to mix with sufficient cold water in the mixing chamber, thereby making the water temperature supplied from the mixing chamber to the second outlet section more stable and further reducing the temperature fluctuation of the water output by the gas water heater.

[0046] By reducing the flow rate when the flow sensor detects water flowing through the inlet pipe and increases the water flow rate, the water flow regulation mechanism is closed. This reduces the bypass ratio of cold water supplied to the mixing chamber through the bypass pipe, even when the increased water flow rate to the inlet pipe reduces the heat received per unit volume of water in the heat exchanger, leading to a decrease in the water temperature in the heat storage chamber. This allows the cooled hot water output from the heat storage chamber to the mixing chamber to mix with a smaller amount of cold water in the mixing chamber, resulting in a more stable water temperature supplied from the mixing chamber to the second outlet section, further reducing the temperature fluctuation of the water output from the gas water heater. Attached Figure Description

[0047] Figure 1 is a structural schematic diagram of a gas water heater provided in an embodiment of this application;

[0048] Figure 2 is a partial three-dimensional structural diagram of a water tank, a first water outlet section, a second water outlet section and a bypass pipe provided in an embodiment of this application;

[0049] Figure 3 is a partial structural schematic diagram of a water tank, a first water outlet section, a second water outlet section and a bypass pipe provided in an embodiment of this application;

[0050] Figure 4 is a partial structural schematic diagram of the water tank (with a turbulence-inducing structure in the mixing chamber) provided in the embodiment of this application;

[0051] Figure 5 is a partial structural schematic diagram of the gas water heater provided in the first embodiment of this application;

[0052] Figure 6 is a partial structural schematic diagram of a gas water heater provided in the second embodiment of this application;

[0053] Figure 7 is a partial structural schematic diagram of a gas water heater provided in the third embodiment of this application;

[0054] Figure 8 is a partial structural schematic diagram of the gas water heater provided in the fourth embodiment of this application;

[0055] Labeling Explanation: 1. Gas water heater; 10. Inlet pipe; 100. Flow sensor; 101. First inlet section; 102. Second inlet section; 11. Heat exchanger; 12. Outlet pipe; 121. First outlet section; 122. Second outlet section; 13. Water tank; 13a. Narrowing section; 13b. First inlet; 13c. Second inlet; 13d. Outlet; 131. Energy storage chamber; 132. Mixing chamber; 1320. Mixing area; 1320a. First chamber; 1320b. Second chamber; 1321. Drainage area; 133. First baffle; 133a. First through hole; 14. Bypass pipe; 141a. First end; 141b. Second end; 140. Water flow regulating mechanism; 141. Bypass branch pipe; 15. Baffle structure; 150. Baffle tube; 150a. First baffle hole; 151. Separation structure; 151a. Second baffle hole; 152. Second baffle; 152a. Second through hole; 161. First temperature sensor; 162. Second temperature sensor; 163. Third temperature sensor. Detailed Implementation

[0056] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0057] In the description of this application, it should be understood that the terms "center", "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 application 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 application.

[0058] 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. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, unless otherwise stated, "a plurality of" means two or more.

[0059] In the description of this application, it should be noted that, unless otherwise expressly 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 between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0060] As shown in Figure 1, this application provides a gas water heater 1, including a burner and an inlet pipe 10, a heat exchanger 11, and an outlet pipe 12 connected in sequence. The burner can supply heat to the heat exchanger 11. The inlet pipe 10 is equipped with a flow sensor 100. The outlet pipe 12 includes a first outlet section 121 and a second outlet section 122. The gas water heater 1 also includes a water tank 13 and a bypass pipe 14. The water tank 13 is provided with a first inlet 13b, a second inlet 13c, an outlet 13d, a flow-slowing structure, and a flow-turbulence-inducing structure. Structure 15 has a first water outlet section 121 connected to the first water inlet 13b, a second water outlet section 122 connected to the water outlet 13d, a second water inlet 13c located between the first water inlet 13b and the water outlet 13d, a slow-flow structure located between the first water inlet 13b and the second water inlet 13c, a turbulence structure 15 located between the slow-flow structure and the water outlet 13d, a bypass pipe 14 with one end connected to the water inlet pipe 10 and the other end connected to the second water inlet 13c, and a water flow regulating mechanism 140 provided in the bypass pipe 14.

[0061] By setting up a water tank 13 and a bypass pipe 14, on the one hand, the portion of the water tank 13 located between the second inlet 13c and the first inlet 13b can receive water output from the heat exchanger 11 through the first outlet section 121 to the first inlet 13b. Thus, during the second startup of the gas water heater 1, the two sections of water with a large temperature difference output from the heat exchanger 11 can mix in the portion of the water tank 13 located between the second inlet 13c and the first inlet 13b. This allows the superheated water to compensate for the insufficiently heated water, reducing the temperature difference between the two outlet sections. On the other hand... By setting a bypass pipe 14, a portion of the cold water in the inlet pipe 10 can flow directly through the bypass pipe 14 to the water tank 13 near the second inlet 13c, so as to mix with the hot water that enters from between the second inlet 13c and the first inlet 13b and between the second inlet 13c and the outlet 13d to obtain water at a preset temperature. At this time, the heat exchanger 11 needs to heat the water flowing through the heat exchanger 11 to a temperature higher than the preset temperature. Thus, when the gas water heater 1 is started for the second time, the overheated part of the water can store more heat to provide more heat compensation for the part of the water that has not been fully heated.

[0062] Furthermore, by setting a slow-flow structure in the water tank 13 between the second inlet 13c and the first inlet 13b, a certain obstruction can be formed on the water flowing from near the first inlet 13b to near the second inlet 13c, so as to prevent the hot water near the first inlet 13b from flowing quickly to near the second inlet 13c and mixing with the cold water output from the second inlet 13c. This allows the hot water to remain between the first inlet 13b and the slow-flow structure for a longer time, so that the heat of the hot water can be stored between the first inlet 13b and the slow-flow structure for a longer time, and the heat stored between the first inlet 13b and the slow-flow structure can provide more heat compensation for the part of water that has not been fully heated. By installing a turbulence structure 15 in the water tank 13 between the slow-flow structure and the outlet 13d, the cold water entering the water tank 13 from the second inlet 13c through the bypass pipe 14 and the hot water flowing from the slow-flow structure to the vicinity of the second inlet 13c can be mixed more thoroughly in the water tank 13, so as to further reduce the temperature fluctuation of the water transported from the slow-flow structure and the outlet 13d to the second outlet section 122 and output to the gas water heater 1.

[0063] In one embodiment, the water tank 13 has a connected energy storage chamber 131 and a mixing chamber 132. The energy storage chamber 131 is connected to a first water inlet 13b, and the mixing chamber 132 is connected to a second water inlet 13c and a water outlet 13d. The slow-flow structure has a narrowing section 13a located between the energy storage chamber 131 and the mixing chamber 132. The cross-sectional area of ​​the narrowing section 13a is smaller than the cross-sectional area of ​​the energy storage chamber. Thus, on the one hand, the energy storage chamber 131 of the water tank 13 can be used to receive water output from the heat exchanger 11 through the first water outlet section 121. On the other hand, when the gas water heater 1 starts up for the second time, the water output from the heat exchanger 11 in two sections with a large temperature difference can be received. The water can be mixed in the energy storage chamber 131 to use the superheated part of the water to compensate for the heat of the part of the water that has not been fully heated, thereby reducing the temperature difference between the two water outlets. On the other hand, by setting a bypass pipe 14, a part of the cold water in the inlet pipe 10 can flow directly through the bypass pipe 14 to the mixing chamber 132 to mix with the hot water entering the mixing chamber 132 from the energy storage chamber 131 to obtain water at a preset temperature. At this time, the heat exchanger 11 needs to heat the water flowing through the heat exchanger 11 to a temperature higher than the preset temperature. Thus, when the gas water heater 1 is started for the second time, the superheated part of the water can store more heat to provide more heat compensation for the part of the water that has not been fully heated.

[0064] Referring to Figure 2, in one embodiment, the slow-flow structure includes a first baffle 133. The water tank 13 is equipped with the first baffle 133, which divides the internal space of the water tank 13 into an energy storage chamber 131 and a mixing chamber 132. Specifically, the first baffle 133 is located between the energy storage chamber 131 and the mixing chamber 132. The first baffle 133 is provided with multiple first through holes 133a spaced apart, connecting the energy storage chamber 131 and the mixing chamber 132. These multiple first through holes 133a constitute a narrowing portion 13a, thereby reducing the direct contact between the hot water entering the energy storage chamber 131 and the mixing chamber 132 through the first baffle 133. The possibility of water phase mixing within the energy storage chamber 131 allows the heat carried by the hot water to remain in the energy storage chamber 131 for a period of time, thereby improving the energy storage effect of the energy storage chamber 131. On the other hand, by providing the first through hole 133a, the hot water in the energy storage chamber 131 can pass through the first through hole 133a to enter the mixing chamber 132. Since the total opening area of ​​the first through hole 133a on the first baffle 133 is smaller than the total area of ​​one side of the first baffle 133, the hot water in the energy storage chamber 131 can also be accelerated when passing through the first through hole 133a due to the reduced flow path. Thus, the hot water can enter the mixing chamber 132 at a faster speed, making it easier to mix fully with the cold water in the mixing chamber 132.

[0065] Referring to Figure 3, in another embodiment, the outer periphery of the water tank 13 can be narrowed to form a narrowing section 13a at the junction of the energy storage cavity 131 and the mixing cavity 132 inside the water tank 13. That is, the slow-flow structure includes the narrowed part of the water tank 13 structure. This narrowing section 13a can narrow the flow path at the junction of the energy storage cavity 131 and the mixing cavity 132, creating a certain resistance to the water flow as the hot water in the energy storage cavity 131 enters the mixing cavity 132. This allows the heat carried by the hot water to remain in the energy storage cavity 131 for a period of time, and the hot water will be accelerated due to the narrowing of the flow path when passing through the junction of the energy storage cavity 131 and the mixing cavity 132, thus entering the mixing cavity 132 at a faster speed and more easily mixing with the cold water in the mixing cavity 132.

[0066] Furthermore, the narrowed portion 13a can be manufactured by locally narrowing the shape of the water tank 13 on the outside, thus eliminating the need to process the water tank 13 inside, which makes the molding process of the narrowed portion 13a easier.

[0067] Since the larger the water capacity of heat exchanger 11, the longer the water receives heat in heat exchanger 11, the less the problem of newly entering cold water being insufficiently heated due to the start-up time difference during the second start-up of gas water heater 1 is. However, the larger the volume of heat exchanger 11, the higher the material cost. On the other hand, the smaller the water capacity of heat exchanger 11, the shorter the water receives heat in heat exchanger 11, and the greater the problem of newly entering cold water being insufficiently heated due to the start-up time difference during the second start-up of gas water heater 1. In this case, the smaller the volume of heat exchanger 11, the lower the material cost.

[0068] Therefore, this embodiment is more suitable for situations where the water capacity of the heat exchanger 11 is small. Since the water capacity of the heat exchanger 11 is small, the amount of superheated water output from the heat exchanger 11 after the gas water heater 1 is started for the second time is small, and thus the required volume of the energy storage chamber 131 is also small. Based on this, in one embodiment, the volume of the energy storage chamber 131 is smaller than the volume of the mixing chamber 132. Thus, within the limited internal space of the gas water heater 1, the volume of the energy storage chamber 131 can meet the usage requirements, while the mixing chamber 132 can be larger. This allows the hot water output from the energy storage chamber 131 and the cold water output from the bypass pipe 14 to mix more thoroughly and for a longer time in the mixing chamber 132, thereby further reducing the temperature change of the water transported from the mixing chamber 132 to the second water outlet section 122.

[0069] Please refer to Figures 1, 2, and 3 together. In one embodiment, the turbulence structure 15 includes a second baffle 152, which divides the mixing chamber 132 into a mixing region 1320 and a drainage region 1321. The second baffle 152 is provided with a plurality of second through holes 152a at intervals. The bypass pipe 14 and the energy storage chamber 131 are both connected to the mixing region 1320, and the second water outlet section 122 is connected to the drainage region 1321, so that the drainage region 1321 can be connected to the mixing region 1320. The area between the mixing zone 1320 and the second outlet section 122 forms a buffer between the mixed hot and cold water, thereby creating a certain disturbance to the flow direction and velocity of the hot and cold water. This allows the water that has been initially mixed in the mixing zone 1320 to continue mixing in the drainage zone 1321 before entering the second outlet section 122. This prevents the hot and cold water that has not been fully mixed in the mixing zone 1320 from directly entering the second outlet section 122, and further improves the temperature stability of the water discharged from the second outlet section 122.

[0070] Furthermore, by including a second baffle 152 in the turbulence structure 15 and providing a second through hole 152a in the second baffle 152, hot water in the mixing zone 1320 can pass through the second through hole 152a to enter the drainage zone 1321. Since the total opening area of ​​the second through hole 152a on the second baffle 152 is smaller than the total area of ​​one side of the second baffle 152, the warm water in the mixing zone 1320 can also be accelerated when passing through the second through hole 152a due to the reduced flow path. As a result, the warm water can enter the drainage zone 1321 at a faster speed, so that the hot water and cold water can be further mixed during the process of flowing into the drainage zone 1321.

[0071] Because liquid water has the characteristic that the higher the temperature, the lower the density, hot water entering the inner cavity of the water tank 13 from the first outlet section 121 tends to float to the top of the inner cavity of the water tank 13 along the direction of gravity, while cold water entering the inner cavity of the water tank 13 from the inlet of the bypass pipe 14 tends to sink to the bottom of the inner cavity of the water tank 13 along the direction of gravity. Based on this, in one embodiment, the energy storage cavity 131 and the mixing cavity 132 of the water tank 13 are arranged sequentially along the direction of gravity, and the energy storage cavity 131 is located above the mixing cavity 132. Thus, the relative positions of the energy storage cavity 131 and the mixing cavity 132 conform to the laws of nature. Regardless of whether there is a partition structure 151 between the energy storage cavity 131 and the mixing cavity 132, the energy storage effect of the energy storage cavity 131 and the mixing effect of the mixing cavity 132 can be made more reliable.

[0072] During the use of the gas water heater 1, the storage chamber 131 continuously receives hot water output from the first outlet section 121. Therefore, the newly entering hot water in the storage chamber 131 will push some of the hot water originally located in the storage chamber 131 towards the mixing chamber 132 located below. The water in the mixing chamber 132 will also tend to flow downwards. Therefore, when the water tank 13 has a mixing area 1320 and a drainage area 1321, the drainage area 1321 can be located below the mixing area 1320 along the direction of gravity, so that the relative positions of the mixing area 1320 and the drainage area 1321 conform to the laws of nature. This makes the mixing effect of cold water and hot water in the mixing area 1320 and the buffering and further mixing effect of the mixed cold water and hot water in the drainage area 1321 more reliable, as shown in Figure 2. In Figure 2, the arrows show the up and down direction of the water tank 13 along the direction of gravity when it is in use.

[0073] In other embodiments, the energy storage chamber 131 and the mixing chamber 132 may be arranged in a horizontal direction, and there may be a separation structure between the energy storage chamber 131 and the mixing chamber 132, such as a first baffle 133, so that the energy storage effect of the energy storage chamber 131 and the mixing effect of the mixing chamber 132 can meet the usage requirements, while making the arrangement of the energy storage chamber 131 and the mixing chamber 132 more flexible, so as to be applicable to more different internal installation space conditions of the gas water heater 1.

[0074] In other embodiments, when the water tank 13 has a mixing area 1320 and a drain area 1321, the mixing area 1320 and the drain area 1321 can also be arranged in a horizontal direction, so that the mixing effect of the mixing area 1320 for supplying cold water and hot water and the drain area 1321 for supplying mixed cold water and hot water for buffering and further mixing can both meet the usage requirements, while making the arrangement of the mixing area 1320 and the drain area 1321 more flexible, so as to be applicable to more different internal installation space conditions of the gas water heater 1.

[0075] Referring to Figure 4, in one embodiment, the turbulence structure 15 includes a turbulence cylinder 150. The interior of the turbulence cylinder 150 is connected to the bypass pipe 14. The turbulence cylinder 150 is provided with a plurality of first turbulence holes 150a at intervals. The first turbulence holes 150a are connected between the interior of the turbulence cylinder 150 and the interior of the water tank 13. Thus, the cold water in the bypass pipe 14 needs to flow through the interior of the turbulence cylinder 150 and the first turbulence holes 150a in sequence to enter the mixing chamber 132. Since the total opening area of ​​the first turbulence holes 150a on the first baffle 133 is smaller than the total area of ​​the outer surface of the turbulence cylinder 150, the cold water can be accelerated when passing through the first turbulence holes 150a due to the reduced flow path. Thus, the cold water is more likely to form turbulence after entering the mixing chamber 132, so as to more easily mix with the hot water in the mixing chamber 132.

[0076] When the water tank 13 has an energy storage cavity 131 and a mixing cavity 132 as described in the foregoing embodiments, the turbulence cylinder 150 is located inside the mixing cavity 132, and the first turbulence hole 150a is connected between the interior of the turbulence cylinder 150 and the mixing cavity 132.

[0077] When the turbulence structure 15 includes a second baffle 152 as described in the foregoing embodiments, and the second baffle 152 divides the mixing chamber 132 into a water mixing area 1320 and a drainage area 1321, the turbulence cylinder 150 is disposed in the water mixing area 1320.

[0078] In another embodiment, the turbulence structure 15 includes a partition structure 151 that divides the mixing chamber 132 into a first chamber 1320a and a second chamber 1320b. The energy storage chamber 131 and the bypass pipe 14 are both connected to the first chamber 1320a. The partition structure 151 is provided with a plurality of second turbulence holes 151a at intervals, which are connected between the first chamber 1320a and the second chamber 1320b. Thus, the hot water in the energy storage chamber 131 and the cold water in the bypass pipe 14 must both enter the first chamber 1320a and then flow through the second chamber 1320b. The turbulence hole 151a enters the second cavity 1320b, thereby enabling hot and cold water to mix when passing through the second turbulence hole 151a. Furthermore, since the total opening area of ​​the second turbulence hole 151a on the partition structure 151 is smaller than the total area of ​​one side surface of the partition structure 151, the cold and hot water can be accelerated as they pass through the second turbulence hole 151a due to the reduced flow path. As a result, the cold and hot water are more likely to form turbulence after entering the second cavity 1320b, making it easier for them to mix fully with the hot water in the second cavity 1320b.

[0079] When the water tank 13 is provided with a first baffle 133 as described in the foregoing embodiments, the first through holes 133a on the first baffle 133 are all connected between the energy storage cavity 131 and the first cavity 1320a.

[0080] When, as described in the foregoing embodiments, the turbulence structure 15 includes a second baffle 152, which divides the mixing chamber 132 into a water mixing region 1320 and a drainage region 1321, the partition structure 151 is disposed within the water mixing region 1320 to divide the water mixing region 1320 into a first chamber 1320a and a second chamber 1320b. The second chamber 1320b is connected to the drainage region 1321 through the second through hole 152a of the second baffle 152.

[0081] In another exemplary embodiment, the turbulence structure 15 may include both a turbulence cylinder 150 and a partition structure 151, thereby further enhancing the degree of mixing of hot and cold water in the mixing chamber 132.

[0082] The water flow regulating mechanism 140 can have a variety of different specific structures. The following will introduce several different water flow regulating mechanisms 140 by example.

[0083] In one embodiment, the water flow regulating mechanism 140 is a water proportional valve. The water flow regulating mechanism 140 can be used to regulate the water flow of the bypass pipe 14 in multiple stages, or it can be used to regulate the water flow of the bypass pipe 14 steplessly, so as to adjust the bypass ratio of the gas water heater 1 with high precision.

[0084] In one embodiment, the water flow regulating mechanism 140 is a switch valve, that is, the water flow regulating mechanism 140 is a valve with only two states: closed and open. In the open state, the flow path of the water flow regulating mechanism 140 is fixed to a set flow path. A water flow regulating mechanism 140 located in the bypass pipe 14 can be used to make the water flow in the bypass pipe 14 a fixed flow rate, or to close the bypass pipe 14 to prevent water flow. In other words, two-stage adjustment of the water flow in the bypass pipe 14 is achieved.

[0085] In other embodiments, the water flow rate in the bypass pipe 14 can be adjusted in more ways by setting up various bypass pipes 14 and water flow adjustment mechanisms 140.

[0086] As shown in Figure 5, in one embodiment, the water flow regulating mechanism 140 is a switch valve. The gas water heater 1 includes multiple water flow regulating mechanisms 140, and all water flow regulating mechanisms 140 are connected in parallel, so that the overall water flow of the bypass pipe 14 can be adjusted through the water flow regulating mechanism 140.

[0087] For example, Figure 5 shows two water flow regulating mechanisms 140. When both water flow regulating mechanisms 140 are closed, there is no water flow in the bypass pipe 14. When one of the two water flow regulating mechanisms 140 is open and the other is closed, the total water flow of the bypass pipe 14 is equivalent to the water flow in the one water flow regulating mechanism 140 that is open. When both water flow regulating mechanisms 140 are open, the total water flow of the bypass pipe 14 is equivalent to the sum of the water flow in the two water flow regulating mechanisms 140, thereby realizing multi-level adjustment of the water flow of the bypass pipe 14.

[0088] If the water flow rates of the two water flow regulating mechanisms 140 are the same when they are in the open state, that is, the predetermined flow paths of the two water flow regulating mechanisms 140 are the same, then when one of the two water flow regulating mechanisms 140 is open and the other is closed, the overall water flow rate of the bypass pipe 14 is the same regardless of which one is open. Therefore, the water flow rate of the bypass pipe 14 can be adjusted in three stages at this time.

[0089] If the water flow rates of the two water flow regulating mechanisms 140 are different when they are open, that is, if the predetermined flow paths of the two water flow regulating mechanisms 140 are different, then when one of the two water flow regulating mechanisms 140 is open and the other is closed, the overall water flow rate of the bypass pipe 14 will be different when the two water flow regulating mechanisms 140 are open respectively. Therefore, the water flow rate of the bypass pipe 14 can be adjusted in four stages at this time.

[0090] As shown in Figure 6, in one embodiment, the water flow regulating mechanism 140 is a switch valve, and a bypass branch pipe 141 is also provided on the bypass pipe 14. The bypass branch pipe 141 is connected in parallel with at least one water flow regulating mechanism 140 so that the overall water flow of the bypass pipe 14 can be adjusted by the water flow regulating mechanism 140.

[0091] For example, Figure 6 shows a single water flow regulating mechanism 140. When the water flow regulating mechanism 140 is closed, the overall water flow of the bypass pipe 14 is equivalent to the water flow in the bypass branch pipe 141. When the water flow regulating mechanism 140 is open, the overall water flow of the bypass pipe 14 is equivalent to the sum of the water flow in the bypass branch pipe 141 and the water flow through the water flow regulating mechanism 140, thereby achieving two-stage adjustment of the water flow of the bypass pipe 14.

[0092] Furthermore, when the bypass branch pipe 141 is connected in parallel with multiple water volume regulating mechanisms 140, the multiple water volume regulating mechanisms 140 are connected in parallel in pairs, and the bypass branch pipe 141 is connected in parallel with all multiple water volume regulating mechanisms 140.

[0093] As shown in Figure 7, the bypass branch pipe 141 further has a first end 141a and a second end 141b, both of which are connected to the bypass pipe 14. The first end 141a is close to the water tank 13, and the second end 141b is close to the inlet pipe 10. A water flow regulating mechanism 140 is provided between the first end 141a and the water tank 13, or between the second end 141b and the inlet pipe 10. Thus, when the water flow regulating mechanism 140 between the first end 141a and the water tank 13 or between the second end 141b and the inlet pipe 10 is closed, no water flows in the bypass pipe 14. When the first end 141a is closed, the water flow regulating mechanism 140 between the first end 141a and the water tank 13 or between the second end 141b and the inlet pipe 10 is closed, no water flows in the bypass pipe 14. When the water flow regulating mechanism 140 between the first end 141a and the water tank 13 or between the second end 141b and the inlet pipe 10 is opened, the overall water flow of the bypass pipe 14 is at least the water flow in the bypass branch pipe 141. At this time, as described in the aforementioned technical solution, the overall water flow of the bypass pipe 14 can be regulated by the water flow regulating mechanism 140 connected in parallel with the bypass branch pipe 141 (i.e., the water flow regulating mechanism 140 located between the first end 141a and the second end 141b). FIG7 exemplarily shows the case where a water flow regulating mechanism 140 is provided between the second end 141b and the inlet pipe 10, and there is only one water flow regulating mechanism 140 connected in parallel with the bypass branch pipe 141.

[0094] As shown in Figure 8, in one embodiment, the water flow regulating mechanism 140 is a three-way proportional valve. The water inlet pipe 10 includes a first water inlet section 101 and a second water inlet section 102. The water flow regulating mechanism 140 is connected to the first water inlet section 101, the second water inlet section 102 and the bypass pipe 14 respectively. The end of the second water inlet section 102 away from the water flow regulating mechanism 140 is connected to the heat exchanger 11. The water flow regulating mechanism 140 can receive cold water output from the first water inlet section 101 and adjust the ratio of cold water flowing to the bypass pipe 14 and the second water inlet section 102 respectively, thereby adjusting the bypass ratio of the gas water heater 1.

[0095] Please refer again to Figure 1. In one embodiment, the gas water heater 1 further includes a first temperature sensor 161, a second temperature sensor 162, and a third temperature sensor 163. The first temperature sensor 161 is located in the inlet pipe 10, the second temperature sensor 162 is located in the first outlet section 121, and the third temperature sensor 163 is located in the second outlet section 122. Thus, the first temperature sensor 161 can monitor the inlet water temperature of the inlet pipe 10, the second temperature sensor 162 can monitor the hot water temperature output by the heat exchanger 11, and the third temperature sensor 163 can monitor the outlet water temperature of the second outlet section 122. This allows for better detection of the inlet water temperature, the working status of the heat exchanger 11, and the actual outlet water temperature of the gas water heater 1.

[0096] In one embodiment, the water flow regulating mechanism 140, the first temperature sensor 161, the second temperature sensor 162, and the third temperature sensor 163 are all connected to the main controller (not shown in the figure) via wired or wireless means. The main controller may include a chip with capabilities including but not limited to storage, calculation, and signal output and reception. Thus, the main controller can adjust the water flow rate of the bypass pipe 14 by controlling the water flow regulating mechanism 140 when the actual outlet water temperature of the gas water heater 1 changes, based on the inlet water temperature and the working status of the heat exchanger 11, so as to adjust the bypass ratio of the gas water heater 1 and thereby adjust the actual outlet water temperature of the gas water heater 1, making the stability of the actual outlet water temperature of the gas water heater 1 better.

[0097] Please refer to Figure 1. This application also provides a control method for a gas water heater 1. Using the gas water heater 1 as described in the foregoing embodiments, the control method includes:

[0098] S100: Based on the request for hot water, determine whether the interval between the current time and the last water outage time is less than a preset time.

[0099] S200. If the interval time is less than the preset time, the water flow rate of the bypass pipe 14 is reduced by controlling the water flow regulating mechanism 140.

[0100] By reducing the water flow regulation mechanism 140 when the interval between the current time of the hot water request and the last water outage time is less than a preset time, the flow rate of cold water delivered to the mixing chamber 132 through the bypass pipe 14 can be reduced when the gas water heater 1 restarts for the second time within the preset time. This reduces the temperature drop of the hot water and cold water entering the mixing chamber 132 from the energy storage chamber 131 when the overall water temperature in the energy storage chamber 131 drops during the second restart. This makes the water temperature delivered from the mixing chamber 132 to the second water outlet section 122 more stable, further reducing the temperature fluctuation of the water output by the gas water heater 1.

[0101] For example, whether the water supply is interrupted can be determined by whether the flow rate of the inlet pipe 10 detected by the flow sensor 100 is zero.

[0102] Please refer to Figure 1. This application also provides a control method for a gas water heater 1. Using the gas water heater 1 as described in the foregoing embodiments, the control method includes:

[0103] S101. Based on the request for hot water, determine whether the interval between the current time and the last water outage time is less than a preset time, or determine whether the temperature drop in the current water tank 13 is greater than a preset temperature threshold.

[0104] S201. If the interval time is less than the preset time, or if the temperature drop in the current water tank 13 is not greater than the preset temperature threshold, the water flow rate of the bypass pipe 14 is reduced by controlling the water flow regulating mechanism 140.

[0105] By reducing the flow rate of cold water supplied to the mixing chamber 132 through the bypass pipe 14 when the interval between the current time of the hot water request and the last water outage time is less than a preset time, or when the temperature drop in the current water tank 13 is not greater than a preset temperature threshold, the flow rate of cold water supplied to the mixing chamber 132 through the bypass pipe 14 is reduced when the gas water heater 1 restarts for the second time within a preset time, or when the temperature drop in the water tank is not greater than a preset temperature threshold. This reduces the temperature drop of the hot water and cold water entering the mixing chamber 132 from the energy storage chamber 131 when the overall water temperature in the energy storage chamber 131 drops during the second restart, making the water temperature supplied from the mixing chamber 132 to the second water outlet section 122 more stable, and further reducing the temperature fluctuation of the water output by the gas water heater 1.

[0106] For example, whether the water supply is interrupted can be determined by whether the flow rate of the inlet pipe 10 detected by the flow sensor 100 is zero.

[0107] In the event of a water outage, the second temperature sensor 162 of the gas water heater 1 actually detects the temperature of the water remaining in the first outlet section 121, while the third temperature sensor 163 actually detects the temperature of the water remaining in the second outlet section 122. Based on this, in one embodiment, the temperature difference in the first outlet section 121 detected by the second temperature sensor 162 from the last water outage time to the current time, or the temperature difference in the second outlet section 122 detected by the third temperature sensor 163 from the last water outage time to the current time, or the temperature difference in the first outlet section 121 detected by the second temperature sensor 162 from the last water outage time to the current time and the temperature difference in the second outlet section 122 detected by the third temperature sensor 163 from the last water outage time to the current time, can be used to determine the degree of temperature drop in the water tank 13 from the last water outage time to the current time.

[0108] In addition, since the water supply of gas water heater 1 usually shares a water supply pipe with the water supply of other faucets of the user, during the use of gas water heater 1, the water flow received by the inlet pipe 10 of gas water heater 1 may suddenly decrease or suddenly increase due to the opening or closing of other faucets sharing the water supply pipe.

[0109] When the water flow rate received by the inlet pipe 10 suddenly decreases, the water flow rate in the heat exchanger 11 also decreases. However, the heat supply of the heat exchanger 11 remains stable for a short period. This results in the water flowing through the heat exchanger 11 being overheated for a short time, leading to a sudden increase in the water temperature output from the second outlet section 122 of the gas water heater 1. Conversely, when the water flow rate received by the inlet pipe 10 suddenly increases, the water flow rate in the heat exchanger 11 also increases. However, the heat supply of the heat exchanger 11 remains stable for a short period. This results in the water flowing through the heat exchanger 11 not being fully heated for a short time, leading to a sudden decrease in the water temperature output from the second outlet section 122 of the gas water heater 1.

[0110] Based on this, please continue to refer to Figure 1. This application also provides a control method for a gas water heater 1. Using the gas water heater 1 as described in the foregoing embodiments, the control method includes:

[0111] S102. When the gas water heater 1 is in combustion mode, adjust the water flow rate of the bypass pipe 14 according to the current water flow rate.

[0112] Specifically, step S102 includes:

[0113] S102a. If the flow sensor 100 detects a decrease in the water flow rate in the inlet pipe 10, the water flow rate in the bypass pipe 14 is increased by controlling the water flow regulating mechanism 140.

[0114] S102b If the flow sensor 100 detects an increase in the water flow rate in the inlet pipe 10, the water flow rate in the bypass pipe 14 is reduced by controlling the water flow regulating mechanism 140.

[0115] Specifically, "gas water heater 1 is in combustion state" refers to the state in which the burner of gas water heater 1 is burning to provide heat to heat exchanger 11.

[0116] Therefore, when the flow sensor 100 detects a decrease in the water flow rate in the inlet pipe 10, the water flow regulating mechanism 140 can be opened to increase the bypass ratio of cold water supplied to the mixing chamber 132 through the bypass pipe 14. This allows the superheated hot water output from the heat storage chamber to the mixing chamber 132 to mix with sufficient cold water in the mixing chamber 132, thereby making the water temperature supplied from the mixing chamber 132 to the second outlet section 122 more stable and reducing the temperature fluctuation of the water output by the gas water heater 1.

[0117] When the flow sensor 100 detects an increase in the water flow rate in the inlet pipe 10, the water flow regulating mechanism 140 can be closed to reduce the bypass ratio of cold water supplied to the mixing chamber 132 through the bypass pipe 14. This allows the hot water with a lower temperature output from the heat storage chamber to the mixing chamber 132 to mix with a smaller amount of cold water in the mixing chamber 132, thereby making the water temperature supplied from the mixing chamber 132 to the second outlet section 122 more stable and reducing the temperature fluctuation of the water output by the gas water heater 1.

[0118] 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.

[0119] The specific embodiments described above are merely illustrative of several implementations of this application, and while the descriptions are detailed, they should not be construed as limiting the scope of this patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these modifications and improvements all fall within the scope of protection of this application. Therefore, the scope of protection of this patent application should be determined by the appended claims.

Claims

1. A gas-fired water heater, comprising a burner and an inlet pipe (10), a heat exchanger (11), and an outlet pipe (12) connected in sequence, wherein the burner is capable of supplying heat to the heat exchanger (11), and the inlet pipe (10) is provided with a flow sensor (100), characterized in that, The water outlet pipe (12) includes a first water outlet section (121) and a second water outlet section (122), and the gas water heater (1) further includes: A water tank (13) is provided with a first inlet (13b), a second inlet (13c), an outlet (13d), a flow-slowing structure, and a flow-turbulence structure (15). The first outlet section (121) is connected to the first inlet (13b), the second outlet section (122) is connected to the outlet (13d), the second inlet (13c) is located between the first inlet (13b) and the outlet (13d), the flow-slowing structure is located between the first inlet (13b) and the second inlet (13c), and the flow-turbulence structure (15) is located between the flow-slowing structure and the outlet (13d). A bypass pipe (14) is provided, one end of which is connected to the water inlet pipe (10) and the other end is connected to the second water inlet (13c). The bypass pipe (14) is provided with a water flow regulating mechanism (140).

2. The gas water heater according to claim 1, characterized in that, The water tank (13) has a connected energy storage chamber (131) and a mixing chamber (132). The energy storage chamber (131) is connected to the first water inlet (13b), and the mixing chamber (132) is connected to the second water inlet (13c) and the water outlet (13d). The slow-flow structure has a narrowing section (13a) located between the energy storage chamber (131) and the mixing chamber (132). The cross-sectional area of ​​the narrowing section (13a) is smaller than the cross-sectional area of ​​the energy storage chamber.

3. The gas water heater according to claim 2, characterized in that, The slow-flow structure includes a first baffle (133), which divides the internal space of the water tank (13) into the energy storage chamber (131) and the mixing chamber (132). The first baffle (133) is provided with a plurality of first through holes (133a) at intervals. The first through holes (133a) are connected between the energy storage chamber (131) and the mixing chamber (132). The plurality of first through holes (133a) constitute the narrowing portion (13a).

4. The gas water heater according to claim 2, characterized in that, The turbulence structure (15) includes a second baffle (152), which divides the mixing chamber (132) into a mixing area (1320) and a drainage area (1321). The second baffle (152) is provided with a plurality of second through holes (152a) at intervals. The bypass pipe (14) and the energy storage chamber (131) are both connected to the mixing area (1320), and the second water outlet section (122) is connected to the drainage area (1321).

5. The gas water heater according to claim 2, characterized in that, The volume of the energy storage cavity (131) is smaller than the volume of the mixing cavity (132).

6. The gas water heater according to any one of claims 2-5, characterized in that, The water tank (13) has sequentially connected cavities arranged along the direction of gravity, and the energy storage cavity (131) is located above the mixing cavity (132); and / or, The turbulence structure (15) further includes a partition structure (151), which divides the mixing chamber (132) into a first chamber (1320a) and a second chamber (1320b). The energy storage chamber (131) and the bypass pipe (14) are both connected to the first chamber (1320a). The partition structure (151) is provided with a plurality of second turbulence holes (151a) at intervals, which are connected between the first chamber (1320a) and the second chamber (1320b).

7. The gas water heater according to any one of claims 1-5, characterized in that, The turbulence structure (15) includes a turbulence cylinder (150), the interior of which is connected to the bypass pipe (14). The turbulence cylinder (150) is provided with a plurality of first turbulence holes (150a) at intervals, and the first turbulence holes (150a) are connected between the interior of the turbulence cylinder (150) and the interior of the water tank (13).

8. The gas water heater according to claim 1, characterized in that, The water volume regulating mechanism (140) is a water proportional valve; or, The water flow regulating mechanism (140) is a three-way proportional valve. The water inlet pipe (10) includes a first water inlet section (101) and a second water inlet section (102). The water flow regulating mechanism (140) is connected to the first water inlet section (101), the second water inlet section (102) and the bypass pipe (14). The end of the second water inlet section (102) away from the water flow regulating mechanism (140) is connected to the heat exchanger (11).

9. The gas water heater according to claim 1, characterized in that, The water flow regulating mechanism (140) is a switch valve. The gas water heater (1) includes multiple water flow regulating mechanisms (140), and all the water flow regulating mechanisms (140) are connected in parallel.

10. The gas water heater according to claim 1, characterized in that, The water volume regulating mechanism (140) is a switch valve, and a bypass branch pipe (141) is also provided on the bypass pipe (14), and the bypass branch pipe (141) is connected in parallel with at least one of the water volume regulating mechanisms (140).

11. The gas water heater according to claim 10, characterized in that, The bypass branch pipe (141) has a first end (141a) and a second end (141b) opposite to each other. Both the first end (141a) and the second end (141b) are connected to the bypass pipe (14). The first end (141a) is close to the water tank (13), and the second end (141b) is close to the water inlet pipe (10). The water flow regulating mechanism (140) is provided between the first end (141a) and the water tank (13), or the water flow regulating mechanism (140) is provided between the second end (141b) and the water inlet pipe (10).

12. The gas water heater according to claim 1 or any one of claims 8-11, characterized in that, The gas water heater (1) further includes a first temperature sensor (161), a second temperature sensor (162), and a third temperature sensor (163). The first temperature sensor (161) is located in the inlet pipe (10), the second temperature sensor (162) is located in the first outlet section (121), and the third temperature sensor (163) is located in the second outlet section (122). The water volume regulating mechanism (140), the first temperature sensor (161), the second temperature sensor (162), and the third temperature sensor (163) are all communicatively connected to the main controller.

13. A control method for a gas water heater, characterized in that, Using the gas water heater (1) as described in any one of claims 1-12, the control method includes: Based on the request for hot water, determine whether the interval between the current time and the last time the water was shut off is less than a preset time or whether the current drop in water tank temperature has reached a preset temperature threshold. If the interval time is less than the preset time, the water flow rate of the bypass pipe (14) is reduced by controlling the water flow regulating mechanism (140).

14. A control method for a gas water heater, characterized in that, Using the gas water heater (1) as described in claim 12, the control method includes: Based on the request for hot water, determine whether the interval between the current time and the last time the water was shut off is less than a preset time, or determine whether the temperature drop in the current water tank (13) is greater than a preset temperature threshold. If the interval time is less than the preset time, or if the temperature drop in the current water tank (13) is not greater than the preset temperature threshold, the water flow rate of the bypass pipe (14) is reduced by controlling the water flow regulating mechanism (140).

15. A control method for a gas water heater, characterized in that, Using the gas water heater (1) as described in any one of claims 1-12, the control method includes: When the gas water heater (1) is in combustion mode, the water flow rate of the bypass pipe (14) is adjusted according to the current water flow rate; If the flow sensor (100) detects a decrease in the water flow rate in the inlet pipe (10), the water flow rate in the bypass pipe (14) is increased by controlling the water flow regulating mechanism (140). If the flow sensor (100) detects an increase in the water flow rate in the inlet pipe (10), the water flow rate in the bypass pipe (14) is reduced by controlling the water flow regulating mechanism (140).

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