Circulating water path device and gas water heater

Abstract

The utility model relates to domestic appliance technical field discloses a circulating water path device and gas water heater. Circulating water path device includes circulating water box, water inlet pipe and delivery pipe, and circulating water box sets up in the combustion chamber of gas water heater, and circulating water box has circulating import and circulating export. One end of water inlet pipe is connected with the water inlet device of gas water heater, and the other end is connected with circulating import, and one end of delivery pipe is connected with circulating export, and the other end is connected with the water inlet of heat exchanger of gas water heater. The heat of combustion chamber is at least partially absorbed by circulating water box when spreading outward through the lateral wall of combustion chamber, to heat the water in circulating water box, that is, preheat the water that enters heat exchanger, can improve the heat exchange efficiency of gas water heater. The outer wall of circulating water box is attached to the inner wall of combustion chamber, can cool the lateral wall of combustion chamber, reduce the damage of high temperature to the metal parts around combustion chamber and other parts, improve the service life of gas water heater.

Description

Technical Field

[0001] This utility model relates to the field of household appliance technology, and in particular to a circulating water circuit device and a gas water heater. Background Technology

[0002] A gas water heater consists of a combustion chamber and a heat exchanger. Gas and air mix and are ignited in the combustion chamber to produce a high-temperature flame. The heat exchanger is located above the combustion chamber so that as the high-temperature flue gas flows through it, heat is transferred to the water inside, thus heating the water. To ensure the heating efficiency of the gas water heater, the high-temperature zone of the combustion chamber flame remains very hot. Even after air cooling, the surface temperature of the combustion chamber can still reach over 200°C. This surface heat cannot be effectively recovered and can only diffuse outwards through the water heater's outer casing. This not only wastes heat but also easily damages the sheet metal parts around the combustion chamber and other internal components, affecting the lifespan of the gas water heater.

[0003] In the prior art, patent CN202361635U discloses a heat exchanger for a gas water heater, in which water pipes are wound around the outer surface of the middle part of the combustion chamber in the height direction. With this structure, the cold water inlet end of the water pipe is first preheated in the lower part of the combustion chamber by the flame in the middle, and then heated by the heat exchange plates at the top of the combustion chamber. However, due to the limited arrangement of the water pipes, heat can only be exchanged with the water pipes on the outer surface of the combustion chamber. The heat transfer efficiency is limited, and the heat still needs to diffuse out of the combustion chamber. The temperature around the combustion chamber is relatively high, which can also affect the service life of other components.

[0004] Therefore, there is an urgent need for a circulating water system and a gas water heater to solve the above problems. Utility Model Content

[0005] One objective of this invention is to provide a circulating water circuit device that can recover the surface temperature of the combustion chamber, which can not only improve the heat exchange efficiency of the gas water heater, but also extend the service life of the gas water heater.

[0006] Based on the above concept, the technical solution adopted by this utility model is as follows:

[0007] A circulating water circuit device is provided, comprising:

[0008] A circulating water box is installed in the combustion chamber of a gas water heater. The outer wall of the circulating water box is attached to the inner wall of the combustion chamber. The circulating water box has a circulation inlet and a circulation outlet.

[0009] A water inlet pipe, one end of which is connected to the water inlet device of the gas water heater, and the other end of which is connected to the circulation inlet;

[0010] The outlet pipe has one end connected to the circulation outlet and the other end connected to the inlet of the heat exchanger of the gas water heater.

[0011] Optionally, a threaded inlet component is provided at the circulation inlet, and an inlet threaded connector is provided at the other end of the water inlet pipe. The threaded inlet component passes through the side wall of the combustion chamber and is located outside the combustion chamber. The threaded inlet component is connected to the inlet threaded connector; and / or,

[0012] A threaded outlet component is provided at the circulation outlet, and an outlet threaded connector is provided at one end of the water outlet pipe. The threaded outlet component passes through the side wall of the combustion chamber and is located outside the combustion chamber. The threaded outlet component is connected to the outlet threaded connector.

[0013] Optionally, a quick-connect inlet component is provided at the circulation inlet, and an inlet quick connector is provided at the other end of the water inlet pipe. The quick-connect inlet component passes through the side wall of the combustion chamber and is located outside the combustion chamber. The quick-connect inlet component is connected to the inlet quick connector; and / or,

[0014] A quick-connect outlet is provided at the circulation outlet, and a quick-connect connector is provided at one end of the water outlet pipe. The quick-connect outlet passes through the side wall of the combustion chamber and is located outside the combustion chamber. The quick-connect outlet is connected to the quick-connect connector.

[0015] Optionally, the circulating water box has a C-shaped structure, and the circulating water box has a first part and a second part arranged opposite to each other, the circulation inlet is located in the first part, and the circulation outlet is located in the second part.

[0016] Optionally, both the circulation inlet and the circulation outlet are provided, and the circulation outlet is located above the circulation inlet in the vertical direction; and / or,

[0017] The circulation inlets are provided at least two at intervals in the vertical direction; and / or,

[0018] The circulation outlets are arranged at least two at intervals in the vertical direction.

[0019] Optionally, one water inlet pipe is provided, and the other end of the water inlet pipe has multiple water inlet ports, which are connected one-to-one with multiple circulation inlets; and / or,

[0020] One water outlet pipe is provided, and one end of the water outlet pipe has multiple water outlet ports, which are connected to multiple circulation outlets one by one.

[0021] Optionally, reinforcing ribs are provided on the wall of the circulating water box.

[0022] Optionally, the circulating water circuit device further includes a control valve, which is disposed on the water inlet pipe and can regulate the water flow rate in the water inlet pipe.

[0023] Optionally, the circulating water circuit device further includes a water flow sensor, which is installed on the inlet pipe and is used to detect the water flow in the inlet pipe. The control valve and the water flow sensor are connected by a signal.

[0024] Another objective of this invention is to provide a gas water heater that can recover the surface temperature of the combustion chamber, which can not only improve the heat exchange efficiency of the gas water heater, but also extend its service life.

[0025] Based on the above concept, the technical solution adopted by this utility model is as follows:

[0026] A gas water heater is provided, including a combustion chamber and the aforementioned circulating water circuit device, wherein the circulating water box is disposed in conjunction with the inner wall of the combustion chamber.

[0027] The beneficial effects of this utility model are as follows:

[0028] The circulating water system proposed in this invention includes a circulating water box, an inlet pipe, and an outlet pipe. The circulating water box is located within the combustion chamber of a gas water heater and has a circulation inlet and a circulation outlet. One end of the inlet pipe is connected to the water inlet device of the gas water heater, and the other end is connected to the circulation inlet. One end of the outlet pipe is connected to the circulation outlet, and the other end is connected to the inlet of the heat exchanger of the gas water heater. With this configuration, the water from the gas water heater passes through the circulating water box before entering the heat exchanger. Because the high temperature generated by the flame in the combustion chamber cannot be completely absorbed by the heat exchanger, at least part of the heat is absorbed by the circulating water box as it diffuses outward through the side wall of the combustion chamber, thus heating the water in the circulating water box and preheating the water entering the heat exchanger, improving the heat exchange efficiency of the gas water heater. Furthermore, the outer wall of the circulating water box is in contact with the inner wall of the combustion chamber, which further cools the side wall of the combustion chamber, reducing damage to the surrounding sheet metal parts and other internal components of the gas water heater caused by high temperatures, thereby extending the service life of the gas water heater.

[0029] The gas water heater proposed in this utility model includes a combustion chamber and the aforementioned circulating water circuit device. The circulating water box of the circulating water circuit device is installed in close contact with the inner wall of the combustion chamber. When the heat from the combustion chamber diffuses outward through the side wall of the combustion chamber, at least a portion of it is absorbed by the circulating water box, thereby heating the water in the circulating water box, preheating the water entering the heat exchanger, and improving the heat exchange efficiency of the gas water heater. The outer wall of the circulating water box is in close contact with the inner wall of the combustion chamber, which can further cool the side wall of the combustion chamber, thereby reducing the damage caused by high temperatures to the sheet metal parts around the combustion chamber and other internal components of the gas water heater, thus improving the service life of the gas water heater. Attached Figure Description

[0030] Figure 1 This is a schematic diagram of the structure of the first type of circulating water box provided in this embodiment of the utility model;

[0031] Figure 2 This is a schematic diagram of the structure of the second type of circulating water box provided in this embodiment of the utility model;

[0032] Figure 3 This is a schematic diagram of the structure of the second type of circulating water box and combustion chamber provided in this embodiment of the utility model;

[0033] Figure 4 This is a schematic diagram of the structure of the first type of circulating water circuit device provided in this embodiment of the utility model;

[0034] Figure 5 This is a schematic diagram of the structure of the first circulating water circuit device and combustion chamber provided in this embodiment of the utility model;

[0035] Figure 6 This is a schematic diagram of the structure of the third type of circulating water box provided in this embodiment of the utility model;

[0036] Figure 7 This is a schematic diagram of the third type of circulating water box and combustion chamber provided in this embodiment of the utility model;

[0037] Figure 8 This is a first-view structural schematic diagram of the fourth type of circulating water box provided in this embodiment of the utility model;

[0038] Figure 9 This is a second-view structural schematic diagram of the fourth type of circulating water box provided in this embodiment of the utility model;

[0039] Figure 10 This is a third-view structural diagram of the fourth type of circulating water box and combustion chamber provided in this embodiment of the utility model;

[0040] Figure 11 This is a fourth-view structural diagram of the fourth type of circulating water box and combustion chamber provided in this embodiment of the utility model;

[0041] Figure 12 This is a schematic diagram of the structure of the first type of water inlet pipe provided in this embodiment of the utility model;

[0042] Figure 13 This is a schematic diagram of the structure of the second type of water inlet pipe provided in this embodiment of the utility model;

[0043] Figure 14 This is a schematic diagram of the structure of the first type of water outlet pipe provided in this embodiment of the utility model;

[0044] Figure 15 This is a schematic diagram of the structure of the second type of water outlet pipe provided in this embodiment of the utility model;

[0045] Figure 16 This is a partial structural schematic diagram of the gas water heater provided in this embodiment of the utility model.

[0046] In the picture:

[0047] 1. Circulating water box; 11. Circulating inlet; 111. Threaded inlet fitting; 112. Quick-connect inlet fitting; 12. Circulating outlet; 121. Threaded outlet fitting; 122. Quick-connect outlet fitting; 13. Reinforcing rib;

[0048] 2. Water inlet pipe; 21. Inlet threaded connector; 22. Control valve;

[0049] 3. Water outlet pipe; 31. Quick-connect connector for outlet;

[0050] 10. Combustion chamber; 20. Water inlet device; 30. Water outlet device; 40. Heat exchanger. Detailed Implementation

[0051] To make the technical problem solved by this utility model, the technical solution adopted, and the technical effect achieved clearer, the technical solution of this utility model will be further described below with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are merely for explaining this utility model and not for limiting it. Furthermore, it should be noted that, for ease of description, only the parts related to this utility model are shown in the accompanying drawings, not all of them.

[0052] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; 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; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0053] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0054] In the description of this embodiment, the terms "upper," "lower," "left," and "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, 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 utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0055] The technical solution of this utility model will be further described below with reference to the accompanying drawings and specific embodiments.

[0056] like Figures 1 to 15 As shown, this embodiment provides a circulating water circuit device, including a circulating water box 1, an inlet pipe 2, and an outlet pipe 3. The circulating water box 1 is disposed inside the combustion chamber 10 of a gas water heater, and has a circulation inlet 11 and a circulation outlet 12. One end of the inlet pipe 2 is connected to the water inlet device 20 of the gas water heater, and the other end of the inlet pipe 2 is connected to the circulation inlet 11. One end of the outlet pipe 3 is connected to the circulation outlet 12, and the other end of the outlet pipe 3 is connected to the inlet of the heat exchanger 40 of the gas water heater. Under this configuration, the water in the gas water heater needs to pass through the circulating water box 1 before entering the inlet of the heat exchanger 40. Because the high temperature generated by the flame in the combustion chamber 10 during combustion cannot be completely absorbed by the heat exchanger 40, at least part of the heat will be absorbed by the circulating water box 1 when it diffuses outward through the side wall of the combustion chamber 10, thereby heating the water in the circulating water box 1, that is, preheating the water entering the heat exchanger 40, and improving the heat exchange efficiency of the gas water heater. In addition, the outer wall of the circulating water box 1 is attached to the inner wall of the combustion chamber 10, which can further cool the side wall of the combustion chamber 10, thereby reducing the damage of high temperature to the sheet metal parts around the combustion chamber 10 and other parts inside the gas water heater, thus improving the service life of the gas water heater.

[0057] Optionally, such as Figure 1As shown, a threaded inlet component 111 is provided at the circulation inlet 11, and an inlet threaded connector 21 is provided at the other end of the water inlet pipe 2. When the circulating water box 1 is located inside the combustion chamber 10, the threaded inlet component 111 can pass through the side wall of the combustion chamber 10 and be located outside the combustion chamber 10, so that the threaded inlet component 111 can be connected to the inlet threaded connector 21 located outside the combustion chamber 10. In specific implementation, the water inlet pipe 2 and the circulation inlet 11 are connected by threads, which facilitates the inspection and replacement of the water inlet pipe 2 and the circulating water box 1.

[0058] Optionally, such as Figure 1 As shown, a threaded outlet part 121 is provided at the circulation outlet 12, and an outlet threaded connector is provided at one end of the water outlet pipe 3. When the circulating water box 1 is located inside the combustion chamber 10, the threaded outlet part 121 can pass through the side wall of the combustion chamber 10 and be located outside the combustion chamber 10, so that the threaded outlet part 121 can be connected to the outlet threaded connector located outside the combustion chamber 10. In specific implementation, the water outlet pipe 3 and the circulation outlet 12 are connected by threads, which facilitates the inspection and replacement of the water outlet pipe 3 and the circulating water box 1.

[0059] Optionally, such as Figure 2 and Figure 3 As shown, a quick-connect inlet component 112 is provided at the circulation inlet 11, and an inlet quick connector is provided at the other end of the water inlet pipe 2. When the circulating water box 1 is located inside the combustion chamber 10, the quick-connect inlet component 112 can pass through the side wall of the combustion chamber 10 and be located outside the combustion chamber 10, so that the quick-connect inlet component 112 can be connected to the inlet quick connector located outside the combustion chamber 10. In specific implementation, the water inlet pipe 2 and the circulation inlet 11 are connected by a quick-connect, which facilitates the inspection and replacement of the water inlet pipe 2 and the circulating water box 1.

[0060] Optionally, such as Figure 2 and Figure 3 As shown, a quick-connect outlet component 122 is provided at the circulation outlet 12, and an outlet quick connector 31 is provided at one end of the water outlet pipe 3. When the circulating water box 1 is located inside the combustion chamber 10, the quick-connect outlet component 122 can pass through the side wall of the combustion chamber 10 and be located outside the combustion chamber 10, so that the quick-connect outlet component 122 can be connected to the outlet quick connector 31 located outside the combustion chamber 10. In specific implementation, the water outlet pipe 3 and the circulation outlet 12 are connected by a quick connector, which facilitates the inspection and replacement of the water outlet pipe 3 and the circulating water box 1.

[0061] In this embodiment, as Figure 5As shown, the circulating water box 1 has a C-shaped structure and has a first part and a second part arranged opposite to each other. When the circulating water box 1 is installed in the combustion chamber 10, the first part and the second part of the circulating water box 1 are opposite each other in the horizontal direction. The circulation inlet 11 is located in the first part, and the circulation outlet 12 is located in the second part. That is, the water entering the circulating water box 1 through the circulation inlet 11 needs to flow along the extension direction of the circulating water box 1 to the second part before it can flow out from the circulation outlet 12. This extends the flow path of the circulating water box 1, thereby increasing the heat absorption area of ​​the water and improving the utilization rate of the waste heat of the combustion chamber 10 by the circulating water circuit device.

[0062] In other embodiments, the circulating water box 1 can be an L-shaped structure, meaning that the circulating water box 1 has only a first or second part located on the side of the combustion chamber 10, and the circulation inlet 11 and circulation outlet 12 are located on the same side. To extend the flow path of water in the circulating water box 1 and thus increase the heat absorption area of ​​the water, a partition rib can be provided in the circulating water box 1. The partition rib is used to divide the circulating water box 1 vertically into an upper water box and a lower water box, which are connected at only one end. The lower water box is connected to the circulation inlet 11, and the upper water box is connected to the circulation outlet 12. Water enters the circulating water box 1 through the circulation inlet 11, first flows through the lower water box, and then flows to the end of the circulating water box 1 that is connected. As water continuously enters the lower water box, it pushes the water in the lower water box to flow through the end of the circulating water box 1 that is connected to the upper water box, and finally flows out through the circulation outlet 12.

[0063] Optionally, such as Figure 1 and Figure 2 As shown, the circulating water box 1 is provided with one circulation inlet 11 and one circulation outlet 12, with the circulation outlet 12 located vertically above the circulation inlet 11. This means that water entering the circulating water box 1 through the circulation inlet 11 needs to accumulate to a certain height within the circulating water box 1 before flowing out from the circulation outlet 12. This extends the residence time of the water in the circulating water box 1, thus extending the water's heat absorption time and improving the utilization rate of the waste heat from the combustion chamber 10 by the circulating water circuit device.

[0064] Optionally, such as Figure 6 , Figure 8 and Figure 9As shown, at least two circulation inlets 11 are spaced apart in the vertical direction; and / or at least two circulation outlets 12 are spaced apart in the vertical direction. In specific implementation, the size of the circulating water box 1 is designed according to the size of different combustion chambers 10. If the height of the circulating water box 1 in the vertical direction is large, setting one circulation inlet 11 and one circulation outlet 12 may cause the flow rate of some water entering the circulating water box 1 to slow down, thereby reducing the water flow rate through the circulating water box 1 and affecting the heat exchange efficiency of the circulating water box 1. However, setting multiple circulation inlets 11 and / or circulation outlets 12 spaced apart in the vertical direction can avoid this problem, thereby improving the utilization rate of the waste heat of the combustion chamber 10 by the circulating water circuit device.

[0065] If the circulating water box 1 has a circulation inlet 11, then as follows Figure 12 As shown, one water inlet pipe 2 is provided, and the other end of the water inlet pipe 2 has a water inlet port, which is connected to a corresponding circulation inlet 11. If the circulating water box 1 has multiple circulation inlets 11, then as follows... Figure 13 As shown, one water inlet pipe 2 is provided, and the other end of the water inlet pipe 2 has multiple water inlet ports, which are connected to multiple circulation inlets 11 one by one.

[0066] If the circulating water box 1 has a circulation outlet 12, then as follows Figure 14 As shown, one water outlet pipe 3 is provided, and one end of the water outlet pipe 3 has a water outlet port, which is connected to a corresponding circulation outlet 12. If the circulating water box 1 has multiple circulation outlets 12, then as follows... Figure 15 As shown, one water outlet pipe 3 is provided, and one end of the water outlet pipe 3 has multiple water outlet ports, which are connected to multiple circulation outlets 12 in a one-to-one correspondence.

[0067] Furthermore, reinforcing ribs 13 are provided on the walls of the circulating water box 1. The reinforcing ribs 13 are used to enhance the structural strength of the circulating water box 1, preventing deformation under pressure and ensuring the service life of the circulating water circuit device and the safety of the gas water heater. In specific implementations, the location of the reinforcing ribs 13 can be determined according to actual needs or the pressure simulation structure of the circulating water box 1, placing them on surfaces of the circulating water box 1 with high pressure or in structurally weak locations. In specific implementations, because the circulating water box 1 is located within the combustion chamber 10, its volume is limited by the space within the combustion chamber 10, and the maximum distance between the two opposing inner walls of the circulating water box 1 is generally between 5mm and 10mm.

[0068] Furthermore, the circulating water system also includes a control valve 22, which is installed on the inlet pipe 2 and can regulate the water flow rate in the inlet pipe 2. In specific implementation, depending on the hot water temperature set by the gas water heater, the gas supply and water inlet of the gas water heater also need to be changed accordingly, and the adjustment of the water inlet can be achieved through the control valve 22. Optionally, the control valve 22 is a servo valve.

[0069] Optionally, the circulating water circuit device also includes a water flow sensor, which is installed on the inlet pipe 2, and the control valve 22 is connected to the water flow sensor for signal transmission. The water flow sensor can detect the water flow in the inlet pipe 2 in real time and transmit the water flow signal to the main controller of the gas water heater, so that the main controller can control the opening of the control valve 22 according to actual needs to adjust the water inlet flow.

[0070] like Figure 16 As shown, this embodiment also provides a gas water heater, including a combustion chamber 10 and the aforementioned circulating water circuit device. The circulating water box 1 of the circulating water circuit device is disposed in close contact with the inner wall of the combustion chamber 10. When the heat from the combustion chamber 10 diffuses outward through the side wall of the combustion chamber 10, at least a portion of it is absorbed by the circulating water box 1 to heat the water in the circulating water box 1, that is, to preheat the water entering the heat exchanger 40, thereby improving the heat exchange efficiency of the gas water heater. The outer wall of the circulating water box 1 is in close contact with the inner wall of the combustion chamber 10, which can further cool the side wall of the combustion chamber 10, thereby reducing the damage of high temperature to the sheet metal parts around the combustion chamber 10 and other internal parts of the gas water heater, thus improving the service life of the gas water heater.

[0071] In this embodiment, one end of the inlet pipe 2 of the circulating water circuit device is connected to the inlet device 20 of the gas water heater, and the other end is connected to the circulation inlet 11 of the circulating water box 1. The circulation outlet 12 of the circulating water box 1 is connected to the inlet of the heat exchanger 40 of the gas water heater through the outlet pipe 3, and the outlet of the heat exchanger 40 is connected to the outlet device 30 of the gas water heater. The inlet device 20 is used to supply cold water to the gas water heater, while the outlet device 30 is used to direct the hot water heated by the gas water heater to the outside of the gas water heater.

[0072] The above embodiments merely illustrate the basic principles and characteristics of this utility model. This utility model is not limited to the above embodiments. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A circulating water circuit device, characterized in that, include: A circulating water box (1) is installed in the combustion chamber (10) of a gas water heater. The outer wall of the circulating water box (1) is attached to the inner wall of the combustion chamber (10). The circulating water box (1) has a circulation inlet (11) and a circulation outlet (12). Water inlet pipe (2), one end of which is connected to the water inlet device (20) of the gas water heater, and the other end of which is connected to the circulation inlet (11); Water outlet pipe (3), one end of which is connected to the circulation outlet (12), and the other end of which is connected to the inlet of the heat exchanger (40) of the gas water heater.

2. The circulating water circuit device according to claim 1, characterized in that, A threaded inlet fitting (111) is provided at the circulation inlet (11), and an inlet threaded connector (21) is provided at the other end of the water inlet pipe (2). The threaded inlet fitting (111) passes through the side wall of the combustion chamber (10) and is located outside the combustion chamber (10). The threaded inlet fitting (111) is connected to the inlet threaded connector (21); and / or, A threaded outlet part (121) is provided at the circulation outlet (12), and an outlet threaded connector is provided at one end of the water outlet pipe (3). The threaded outlet part (121) passes through the side wall of the combustion chamber (10) and is located outside the combustion chamber (10). The threaded outlet part (121) is connected to the outlet threaded connector.

3. The circulating water circuit device according to claim 1, characterized in that, A quick-connect inlet fitting (112) is provided at the circulation inlet (11), and an inlet quick connector is provided at the other end of the water inlet pipe (2). The quick-connect inlet fitting (112) passes through the side wall of the combustion chamber (10) and is located outside the combustion chamber (10). The quick-connect inlet fitting (112) is connected to the inlet quick connector; and / or, A quick-connect outlet component (122) is provided at the circulation outlet (12), and an outlet quick connector (31) is provided at the other end of the water outlet pipe (3). The quick-connect outlet component (122) passes through the side wall of the combustion chamber (10) and is located outside the combustion chamber (10). The quick-connect outlet component (122) is connected to the outlet quick connector (31).

4. The circulating water circuit device according to claim 1, characterized in that, The circulating water box (1) has a C-shaped structure and has a first part and a second part arranged opposite to each other. The circulating inlet (11) is located in the first part and the circulating outlet (12) is located in the second part.

5. The circulating water circuit device according to any one of claims 1 or 4, characterized in that, Each of the circulation inlet (11) and the circulation outlet (12) is provided in one location, and the circulation outlet (12) is located above the circulation inlet (11) in the vertical direction; and / or, The circulation inlets (11) are provided at least two at intervals in the vertical direction; and / or, The circulation outlet (12) is provided at least two at intervals in the vertical direction.

6. The circulating water circuit device according to claim 5, characterized in that, One water inlet pipe (2) is provided, and the other end of the water inlet pipe (2) has multiple water inlet ports, which are connected one-to-one with multiple circulation inlets (11); and / or, One water outlet pipe (3) is provided, and one end of the water outlet pipe (3) has multiple water outlet ports, and the multiple water outlet ports are connected to the multiple circulation outlets (12) one by one.

7. The circulating water circuit device according to claim 1, characterized in that, The circulating water box (1) is provided with reinforcing ribs (13) on its box wall.

8. The circulating water circuit device according to claim 1, characterized in that, The circulating water circuit device also includes a control valve (22), which is installed on the water inlet pipe (2) and can adjust the water flow rate in the water inlet pipe (2).

9. The circulating water circuit device according to claim 8, characterized in that, The circulating water circuit device also includes a water flow sensor, which is installed on the inlet pipe (2) and is used to detect the water flow in the inlet pipe (2). The control valve (22) is connected to the water flow sensor.

10. A gas-fired water heater, characterized in that, It includes a combustion chamber (10) and a circulating water circuit device according to any one of claims 1 to 9, wherein the circulating water box (1) is disposed in conjunction with the inner wall of the combustion chamber (10).

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