A double-coil condensing water heater

Abstract

The present invention relates to the technical field of water heaters and discloses a double-coil condensing water heater, comprising: a housing having a cavity; the housing further comprising an air intake assembly connected to the cavity for allowing combustible gas to enter the cavity; a first water inlet pipe spirally disposed in the cavity; as the temperature in the cavity increases, the gap between the pipe walls of the first water inlet pipe increases, and as the temperature in the cavity decreases, the gap between the pipe walls of the first water inlet pipe decreases; a second water inlet pipe spirally disposed in the cavity and located outside the first water inlet pipe; and an ignition needle disposed in the housing for causing the combustible gas in the cavity to burn; wherein the first water inlet pipe and the second water inlet pipe are respectively connected to an external water source, and the water outlet of the second water inlet pipe is further connected to the water inlet of the first water inlet pipe via a return pipe, so that water in the second water inlet pipe enters the first water inlet pipe. The present invention, through the above technical solution, solves the technical problem of low efficacy and significantly reduced thermal efficiency of double-coil condensing water heaters in the related art.

Description

Technical Field

[0001] The present invention relates to the technical field of water heaters, and in particular to a double-coil condensing water heater. Background Art

[0002] A water heater is a household or commercial device designed to heat cold water to a suitable temperature. It uses electricity, gas (natural or liquefied), solar energy, or air energy as a heat source. It heats the water flowing through or stored within it via internal heating elements (such as electric heating tubes, gas burners, heat pumps, or solar collectors).

[0003] A twin-coil condensing water heater is a type of water heater whose core design incorporates two independent heat exchange coils. At high efficiency, this significantly shortens heat-up time and improves continuous hot water supply. However, at low efficiency, the thermal efficiency of current twin-coil condensing water heaters is significantly reduced. Summary of the Invention

[0004] The present application discloses a double-coil condensing water heater to solve the technical problem of double-coil condensing water heaters in related technologies, that is, the thermal efficiency is greatly reduced due to low efficacy.

[0005] In order to solve the above problems, the present invention adopts the following technical solutions:

[0006] A double-coil condensing water heater, comprising:

[0007] The shell has a cavity; the shell also has an air inlet assembly connected to the cavity to allow combustible gas to enter the cavity;

[0008] A first water inlet pipe is spirally disposed in the cavity; as the temperature in the cavity increases, the gap between the pipe walls of the first water inlet pipe increases, and as the temperature in the cavity decreases, the gap between the pipe walls of the first water inlet pipe decreases;

[0009] a second water inlet pipe, spirally arranged in the cavity and located outside the first water inlet pipe;

[0010] an ignition needle, disposed in the housing to cause the combustible gas in the cavity to burn;

[0011] The first water inlet pipe and the second water inlet pipe are respectively connected to an external water source, and the water outlet of the second water inlet pipe is also connected to the water inlet of the first water inlet pipe through a return pipe, so that the water flow in the second water inlet pipe enters the first water inlet pipe.

[0012] In some embodiments, the air intake assembly includes an air intake portion and an air outlet portion; the air intake portion is connected to the air outlet portion, the air intake portion is located outside the housing, and the air outlet portion is located in the cavity;

[0013] Wherein, the first water inlet pipe is arranged around the air outlet.

[0014] In some embodiments, the air outlet portion includes an inner tube and an outer tube; the inner tube is disposed inside the outer tube and a gap is formed between the inner tube and the outer tube;

[0015] The circumferential wall of the inner cylinder is provided with a plurality of first air outlet holes, and the circumferential wall of the outer cylinder is provided with a plurality of second air outlet holes. The aperture of the first air outlet holes is larger than the aperture of the second air outlet holes.

[0016] In some embodiments, the double-coil condensing water heater further includes an intermediate pipe disposed in the cavity;

[0017] The middle pipe extends to the inner side of the first water inlet pipe, and both ends are communicated with the second water inlet pipe respectively.

[0018] In some solutions, the second water inlet pipe is provided with a first partition, the first partition dividing the second water inlet pipe into a first flow channel and a second flow channel;

[0019] One end of the intermediate pipeline is communicated with the second flow channel, and the other end of the intermediate pipeline is communicated with the first flow channel or the second flow channel through a three-way temperature control valve.

[0020] In some embodiments, the direction of water flow in the first flow channel is opposite to the direction of water flow in the second flow channel;

[0021] and / or, the portion of the intermediate pipe extending into the first water inlet pipe is spiral-shaped;

[0022] and / or, the volume of the second water inlet pipe is greater than the volume of the first water inlet pipe;

[0023] And / or, the volume of the first flow channel is greater than the volume of the second flow channel.

[0024] In some embodiments, the double-coil condensing water heater further includes a gas collection pipe, a moving assembly, and a temperature control valve assembly;

[0025] The temperature control valve assembly is connected to the return pipe, and the gas collecting pipe passes through the temperature control valve assembly, and its air inlet and air outlet are respectively connected to the cavity; the moving assembly is arranged in the cavity and divides the cavity into a first chamber and a second chamber; the moving assembly can move along the axial direction of the shell;

[0026] During the process of increasing the width of the gap between the pipe walls of the first water inlet pipe, the pipe wall of the first water inlet pipe drives the moving assembly to move, the air inlet of the gas collecting pipe is located in the first chamber, and the temperature control valve assembly is opened; during the process of decreasing the width of the gap between the pipe walls of the first water inlet pipe, the moving assembly is reset, the air inlet of the gas collecting pipe is located in the second chamber, and the temperature control valve assembly is closed;

[0027] Wherein, the first water inlet pipe and the second water inlet pipe are arranged in the first chamber.

[0028] In some aspects, a temperature control valve assembly includes a valve body, a rotating plate, and a spiral structure;

[0029] The valve body is connected to the return pipe, and a second partition is provided in the valve body, and the second partition has a first through hole; the rotating plate is rotatably provided on the second partition, and the rotating plate has a second through hole;

[0030] The spiral structure is disposed in the valve body and connected to the rotating plate. The spiral structure rotates when heated to drive the rotating plate to rotate, thereby connecting or closing the first through hole and the second through hole.

[0031] The gas collection pipeline passes through a portion of the valve body where a spiral structure is provided.

[0032] In some embodiments, the moving assembly includes a third partition and an elastic member; the third partition is disposed in the cavity via the elastic member and is movable along the axial direction of the housing;

[0033] The third partition wall divides the cavity into a first chamber and a second chamber.

[0034] In some solutions, the first water inlet pipe is provided with a spiral bracket made of a temperature memory alloy;

[0035] Alternatively, the first water inlet pipe is made of a temperature memory alloy.

[0036] The technical solution adopted by the present invention can achieve the following beneficial effects:

[0037] In the double-coil condensing water heater of the present invention, combustible gas enters the cavity through the air intake assembly and is ignited by the ignition needle, causing the combustible gas in the cavity to burn and produce flue gas. The two ends of the first water inlet pipe extend outside the shell, one end is used to connect to a water source, and the other end is used to connect to the water supply pipe. The flue gas generated by the combustion of the combustible gas heats the water flow in the first water inlet pipe. The two ends of the second water inlet pipe extend outside the shell, one end is a water inlet for connecting to a water source, and the other end is a water outlet. It is connected to the water inlet of the first water inlet pipe through a return pipe, so that the water flow in the second water inlet pipe enters the first water inlet pipe. Because the first water inlet pipe is spirally arranged, there is a gap between the pipe walls of the first water inlet pipe. When the flue gas generated by the combustion of the combustible gas in the cavity performs heat exchange with the first water inlet pipe, it will also overflow through the gap between the pipe walls of the first water inlet pipe and perform heat exchange with the second water inlet pipe, thereby achieving the purpose of preheating. The preheated water in the second water inlet pipe flows through the return pipe to the first water inlet pipe, so that the heated water entering the first water inlet pipe has a certain initial temperature, thereby reducing the heating time and the required energy consumption.

[0038] Under low-temperature operating conditions, the flue gas temperature in the cavity is low, and the gap between the walls of the first water inlet pipe is reduced, allowing the flue gas generated by the combustion of the combustible gas to act more on the first water inlet pipe, giving priority to ensuring the heat exchange effect of the first water inlet pipe. Under high-temperature operating conditions, the flue gas temperature in the cavity is high, and the gap between the walls of the first water inlet pipe is increased. The flue gas generated by the combustion of the combustible gas can not only meet the heat exchange needs of the first water inlet pipe, but also preheat the water flow in the second water inlet pipe through the gap between the walls of the first water inlet pipe. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0040] Figure 1 is an axonometric view of a double-coil condensing water heater disclosed in some embodiments of the present application;

[0041] Figure 2 This is a schematic diagram of the connection relationship between the first water inlet pipe, the second water inlet pipe, and the intermediate pipe disclosed in some embodiments of the present application;

[0042] Figure 3 is a cross-sectional view of a double-coil condensing water heater disclosed in some embodiments of the present application;

[0043] Figure 4 yes Figure 3 Enlarged view of point A in the middle;

[0044] Figure 5 is a cross-sectional isometric view of a temperature control valve assembly disclosed in some embodiments of the present application;

[0045] Figure 6 is a schematic diagram of the coordination relationship between the rotating plate and the spiral structure disclosed in some embodiments of the present application;

[0046] Figure 7 is an axonometric view of an air intake assembly disclosed in some embodiments of the present application;

[0047] Figure 8 is a cross-sectional view of an air intake assembly disclosed in some embodiments of the present application;

[0048] Figure 9 yes Figure 8 Enlarged view of point B in the middle;

[0049] Figure 10 This is a schematic diagram of the coordination relationship between the intermediate pipe and the second water inlet pipe disclosed in some embodiments of the present application.

[0050] In the picture:

[0051] 100-housing, 110-cavity, 111-first chamber, 112-second chamber, 120-ignition needle;

[0052] 200-first water inlet pipe;

[0053] 300 - second water inlet pipe, 310 - first flow channel, 320 - second flow channel, 330 - first partition;

[0054] 400-Return pipe;

[0055] 500-gas gathering pipeline;

[0056] 600-intermediate pipe, 610-three-way temperature control valve;

[0057] 700 - temperature control valve assembly, 710 - valve body, 720 - second partition plate, 721 - second through hole, 730 - rotating plate, 731 - first through hole, 740 - spiral structure;

[0058] 800-moving assembly, 810-third partition, 820-elastic member;

[0059] 900-air inlet assembly, 910-air outlet, 911-inner cylinder, 9111-first air outlet, 912-outer cylinder, 9121-second air outlet, 920-air inlet. DETAILED DESCRIPTION

[0060] To make the objectives, technical solutions, and advantages of the present invention more apparent, the technical solutions of the present invention will be described in detail below. Obviously, the embodiments described are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other implementations obtained by those of ordinary skill in the art without inventive effort are within the scope of protection of the present invention.

[0061] The terms "first," "second," and the like in the specification and claims of this application are used to distinguish similar objects, and are not used to describe a specific order or precedence. It should be understood that the terms used in this manner are interchangeable where appropriate, so that the embodiments of this application can be implemented in an order other than that illustrated or described herein, and that the objects distinguished by "first," "second," and the like are generally of the same type, and do not limit the number of objects; for example, the first object can be one or more. In addition, the term "and / or" in the specification and claims refers to at least one of the connected objects, and the character " / " generally indicates that the objects connected are in an "or" relationship.

[0062] A double-coil condensing water heater is a type of water heater whose core design includes two independent heat exchange coils. At high efficiency, the heating time can be significantly shortened, and the continuous hot water supply capacity can be improved. However, at low efficiency, the gas volume is reduced, and the flue gas temperature generated by combustion is low, resulting in the water vapor not being fully condensed in the second water inlet pipe, and latent heat recovery is ineffective. At this point, the energy-saving advantage disappears, and the thermal efficiency may drop to the level of ordinary water heaters. Secondly, due to the spiral structure of the first water inlet pipe, there are gaps between the pipe walls. The flue gas will also overflow through the gaps in the first water inlet pipe wall, and cannot fully act to heat the first water inlet pipe, further reducing the thermal heating efficiency within the first water inlet pipe.

[0063] The following is combined with Figures 1 to 10 , a double-coil condensing water heater provided by the present application is described in detail through specific embodiments and application scenarios.

[0064] A double-coil condensing water heater includes a shell 100, a first water inlet pipe 200, a second water inlet pipe 300, an ignition needle 120, an intermediate pipe 600, an air collecting pipe 500, a moving component 800, a temperature control valve component 700 and an air intake component 900.

[0065] like Figure 3 As shown, the housing 100 has a cavity 110. The housing 100 provides a mounting base for other components, and by providing the cavity 110 in the housing 100, a space is provided for the combustion of the combustible gas and smoke generated by the combustion of the combustible gas is prevented from escaping.

[0066] like Figure 1 and Figure 3 As shown, the housing 100 has an air inlet assembly 900 communicating with the cavity 110 to allow combustible gas to enter the cavity 110. One end of the air inlet assembly 900 is connected to a gas source through a hose so that the combustible gas can enter the cavity 110 through the air inlet assembly 900.

[0067] like Figure 1 As shown, an ignition needle 120 is provided in the housing 100. The ignition needle 120 is used to ignite the combustible gas in the cavity 110 to ensure that the combustible gas burns and generates smoke.

[0068] Accordingly, a sensor may be provided on the housing 100 to detect whether there is combustible gas in the cavity 110. When the sensor detects the presence of combustible gas in the cavity 110, a signal is transmitted to the controller, which controls the ignition needle 120 to operate so as to burn the combustible gas in the cavity 110.

[0069] like Figure 1 、 Figure 2 and Figure 3As shown, a first water inlet pipe 200 is spirally disposed within cavity 110. Both ends of the first water inlet pipe 200 extend outside the housing 100, with one end connected to a water source and the other to a water supply pipe. Flue gas generated by the combustion of the combustible gas heats the water flowing within the first water inlet pipe 200. Furthermore, the spiral arrangement of the first water inlet pipe 200 increases the heat exchange area within the first water inlet pipe 200, ensuring adequate heating of the water within the first water inlet pipe 200.

[0070] like Figure 1 、 Figure 2 and Figure 3 As shown, the second water inlet pipe 300 is spirally disposed in the cavity 110 and is located outside the first water inlet pipe 200. Both ends of the second water inlet pipe 300 extend outside the housing 100. One end is a water inlet for connecting to a water source, and the other end is a water outlet. This outlet is connected to the water inlet of the first water inlet pipe 200 via a return pipe 400, allowing water in the second water inlet pipe 300 to enter the first water inlet pipe 200. Because the first water inlet pipe 200 is spirally disposed, gaps exist between the walls of the first water inlet pipe 200. When the flue gas generated by the combustion of the combustible gas in the cavity 110 exchanges heat with the first water inlet pipe 200, it also overflows through the gaps between the walls of the first water inlet pipe 200 and exchanges heat with the second water inlet pipe 300, thereby achieving the purpose of preheating. The preheated water in the second water inlet pipe 300 flows through the return pipe 400 to the first water inlet pipe 200, so that the heated water entering the first water inlet pipe 200 has a certain initial temperature, thereby reducing the heating time and the required energy consumption.

[0071] Correspondingly, the spirally arranged second water inlet pipe 300 can increase the heat exchange area of ​​the second water inlet pipe 300, ensuring that the water flow in the second water inlet pipe 300 is sufficiently preheated.

[0072] In this embodiment, the water inlet of the first water inlet pipe 200 and the water outlet of the second water inlet pipe 300 are both connected to three-way valves, and the two ends of the return pipe 400 are respectively connected to the ports of the two three-way valves. This arrangement allows the water source of the first water inlet pipe 200 to be replenished through the second water inlet pipe 300 or from the outside.

[0073] The gap between the walls of the first water inlet pipe 200 is adjustable. As the temperature within the cavity 110 increases, the gap between the walls of the first water inlet pipe 200 increases. As the temperature within the cavity 110 decreases, the gap between the walls of the first water inlet pipe 200 decreases. During low power consumption, due to the low temperature within the cavity 110, the flue gas generated by the combustion of the combustible gas not only needs to exchange heat with the water flow within the first water inlet pipe 200, but also preheats the second water inlet pipe 300 through the gap between the walls of the first water inlet pipe 200. This results in poor heat exchange with the water flow within the first water inlet pipe 200 and poor preheating of the water flow within the second water inlet pipe 300. Therefore, by making the gap between the walls of the first water inlet pipe 200 adjustable, when the temperature within the cavity 110 is low, the gap between the walls of the first water inlet pipe 200 decreases, allowing the flue gas generated by the combustion of the combustible gas to act more effectively on the first water inlet pipe 200, thereby prioritizing the heat exchange effect of the first water inlet pipe 200. When the temperature in the cavity 110 is high, the gap between the walls of the first water inlet pipe 200 increases, and the flue gas generated by the combustion of the combustible gas can not only meet the heat exchange of the first water inlet pipe 200, but also preheat the water flow in the second water inlet pipe 300 through the gap between the walls of the first water inlet pipe 200.

[0074] In some embodiments, the first water inlet pipe 200 is equipped with a spiral bracket made of a temperature memory alloy. The deformation characteristics of the temperature memory alloy spiral bracket dynamically adjust the gap between the coils of the first water inlet pipe 200: when the temperature of the cavity 110 rises, the bracket expands due to heat, increasing the gap between the pipe walls, enhancing the flow of high-temperature flue gas and improving heat exchange efficiency. When the temperature drops, the bracket contracts, narrowing the gap and reducing flue gas leakage. This maintains the reliability of traditional copper and stainless steel pipes while achieving active control of the gap, comprehensively resolving the conflict between flue gas leakage and heat exchange efficiency.

[0075] In some embodiments, the first water inlet pipe 200 is made of a temperature memory alloy. By directly constructing the first water inlet pipe 200 from the alloy, the material's inherent temperature-deformation properties enable self-regulation. At high temperatures, the pipe expands radially, naturally increasing the gap, while at low temperatures, it returns to a compact state. This eliminates the need for additional support structures and simplifies the assembly process.

[0076] Specifically, in order to save materials, the spiral portion of the first water inlet pipe 200 is made of a temperature memory alloy.

[0077] like Figure 1 、 Figure 3 、 Figure 7 、 Figure 8 and Figure 9As shown, the air intake assembly 900 includes an air intake portion 920 and an air outlet portion 910; the air intake portion 920 is connected to the air outlet portion 910, and the air intake portion 920 is located outside the housing 100, while the air outlet portion 910 is located within the cavity 110. The location of the air intake portion 920 outside the housing 100 facilitates connection to the gas source and isolates it from the high-temperature environment, reducing the risk of thermal aging of the pipeline; the air outlet portion 910 extends into the interior of the cavity 110 and directly participates in the gas distribution in the combustion zone. By shortening the gas injection path, it reduces energy loss and improves combustion stability and response speed.

[0078] like Figure 9 As shown, the gas outlet portion 910 includes an inner tube 911 and an outer tube 912. The inner tube 911 is disposed within the outer tube 912, with a gap between them. The circumferential wall of the inner tube 911 has a plurality of first gas outlet holes 9111, while the circumferential wall of the outer tube 912 has a plurality of second gas outlet holes 9121. The apertures of the first gas outlet holes 9111 are larger than the apertures of the second gas outlet holes 9121. The large-diameter first gas outlet holes 9111 in the inner tube 911 preferentially release the high-speed gas flow, forming a positive pressure barrier. The small-diameter second gas outlet holes 9121 in the outer tube 912 further refine the gas flow and reduce the local flow velocity, allowing the gas to fully diffuse within the gap layer and premix with the air. During combustion, the flame is confined to the cavity 110 area outside the outer tube 912, and the stepped pressure difference and airflow buffer layer between the inner tube 911 and the outer tube 912 can block the flame's backflow path to the inner tube 911. At the same time, the large aperture design reduces the gas injection resistance and avoids the risk of backfire due to pressure accumulation.

[0079] like Figure 2 and Figure 3 As shown, the intermediate pipe 600 is disposed within the cavity 110 and extends to the inside of the first water inlet pipe 200, with both ends communicating with the second water inlet pipe 300. Some of the water entering from the second water inlet pipe 300 also flows into the intermediate pipe 600. Because the intermediate pipe 600 extends to the inside of the first water inlet pipe 200, the high temperature of the core heating area within the cavity 110 is maximized for heat exchange with the water flowing within the intermediate pipe 600. The heat-exchanged water then flows into the second water inlet pipe 300, further improving the preheating efficiency of the second water inlet pipe 300.

[0080] like Figure 4 and Figure 10As shown, the second water inlet pipe 300 is provided with a first partition 330, which separates the second water inlet pipe 300 into a first flow channel 310 and a second flow channel 320; one end of the intermediate pipe 600 is connected to the second flow channel 320, and the other end of the intermediate pipe 600 is connected to the first flow channel 310 or the second flow channel 320 through a three-way temperature control valve 610. When the temperature in the cavity 110 is low, the three-way temperature control valve 610 connects the first flow channel 310 and the intermediate pipe 600, and the water flow entering from the first flow channel 310 flows through the intermediate pipe 600 and then merges into the first flow channel 310; when the temperature in the cavity 110 is high, the three-way temperature control valve 610 connects the second flow channel 320 and the intermediate pipe 600, and the water flow entering from the first flow channel 310 flows through the intermediate pipe 600 and circulates back and forth in the second flow channel 320. Since the water flow will be fully heated when flowing through the intermediate pipe 600, the water flow circulating back and forth in the intermediate pipe 600 and the second flow channel 320 is ensured to have a higher temperature, so as to exchange heat with the water flow flowing in the first flow channel 310, thereby further increasing the preheating efficiency of the second water inlet pipe 300.

[0081] The direction of water flow in the first flow channel 310 is opposite to the direction of water flow in the second flow channel 320. By having the water flow in the first flow channel 310 and the water flow in the second flow channel 320 in opposite directions, heat exchange is enhanced by convection, thereby further increasing the heat exchange efficiency in the first flow channel 310.

[0082] like Figure 2 and Figure 3 As shown, the portion of the intermediate pipe 600 extending into the first water inlet pipe 200 is spiral. The spiral shape of the portion of the intermediate pipe 600 extending into the first water inlet pipe 200 can increase the heat exchange area of ​​the intermediate pipe 600 in the combustion core area, thereby fully heating the water flowing in the intermediate pipe 600.

[0083] like Figure 2 As shown, the volume of the second water inlet pipe 300 is larger than that of the first water inlet pipe 200. This larger volume allows more water to participate in preheating. When the temperature within the cavity 110 is high, the larger volume of the second water inlet pipe 300 can store more preheated water, which can then be used to provide initial heating for the first water inlet pipe 200 via the return pipe 400, ensuring an adequate water supply to the first water inlet pipe 200.

[0084] like Figure 4 As shown, the volume of the first flow channel 310 is larger than the volume of the second flow channel 320. By making the volume of the first flow channel 310 larger than the volume of the second flow channel 320, a small amount of water can be involved in heat exchange, allowing more water to be supplied to the first water inlet pipe 200, ensuring that the water supply of the first water inlet pipe 200 is sufficient.

[0085] like Figure 1 and Figure 3 As shown, the temperature-controlled valve assembly 700 is connected to the return pipe 400, and the gas collecting pipe 500 passes through the temperature-controlled valve assembly 700, and its air inlet and air outlet are respectively connected to the cavity 110; the moving assembly 800 is arranged in the cavity 110, and divides the cavity 110 into a first chamber 111 and a second chamber 112; the moving assembly 800 can move along the axial direction of the shell 100; in the process of increasing the gap width between the pipe walls of the first water inlet pipe 200, the pipe wall of the first water inlet pipe 200 drives the moving assembly 800 to move, the air inlet of the gas collecting pipe 500 is located in the first chamber 111, and the temperature-controlled valve assembly 700 is opened; in the process of decreasing the gap width between the pipe walls of the first water inlet pipe 200, the moving assembly 800 is reset, the air inlet of the gas collecting pipe 500 is located in the second chamber 112, and the temperature-controlled valve assembly 700 is closed.

[0086] When the temperature within cavity 110 is high, the gap between the walls of the first water inlet pipe 200 increases, causing one end of the first water inlet pipe 200 to contact the movable assembly 800 and drive the movable assembly 800 to move, connecting the air inlet of the gas collection pipe 500 to the first chamber 111 (the combustion core). Simultaneously, the temperature-controlled valve assembly 700 opens, allowing water discharged from the second water inlet pipe 300 to flow through the return pipe 400 to the first water inlet pipe 200. When the temperature within cavity 110 is high, the gap between the walls of the first water inlet pipe 200 decreases, causing the movable assembly 800 to return, connecting the air inlet of the gas collection pipe 500 to the second chamber 112. At this point, the temperature within the return pipe 400 is low, and the temperature-controlled valve assembly 700 closes, allowing water in the second water inlet pipe 300 to flow back to the hot water tank. With this arrangement, when the temperature in the cavity 110 is relatively high (high-load operating condition), the water preheated in the second water inlet pipe 300 flows directly to the first water inlet pipe 200; when the temperature in the cavity 110 is relatively low (low-load operating condition), more water in the hot water tank is allowed to participate in the heat exchange. Even if the flue gas temperature is insufficient, the insufficient energy of a single heat exchange can still be compensated by increasing the heat exchange mass flow rate, thereby avoiding a sudden drop in thermal efficiency at low load.

[0087] In this embodiment, the first water inlet pipe 200 and the second water inlet pipe 300 are disposed in the first chamber 111 .

[0088] Accordingly, the gas collecting pipe 500 is provided with a one-way valve to allow the flue gas to flow in one direction only, thereby preventing the flue gas from still passing through the temperature control valve assembly 700 when one end of the gas collecting pipe 500 is located in the second chamber 112 .

[0089] like Figure 5 and Figure 6As shown, the temperature control valve assembly 700 includes a valve body 710, a rotating plate 730 and a spiral structure 740; the valve body 710 is connected to the return pipe 400, and a second partition 720 is provided in the valve body 710, and the second partition 720 has a first through hole 731; the rotating plate 730 is rotatably set on the second partition 720, and the rotating plate 730 has a second through hole 721; the spiral structure 740 is set in the valve body 710 and connected to the rotating plate 730. The spiral structure 740 rotates when heated to drive the rotating plate 730 to rotate, so that the first through hole 731 and the second through hole 721 are connected or closed.

[0090] When the temperature of the cavity 110 rises, the spiral structure 740 rotates due to the heat, driving the rotating plate 730 to rotate until its second through hole 721 is aligned with the first through hole 731 of the second partition 720. At this time, the return pipe 400 is opened, and the preheated water flow of the second water inlet pipe 300 directly enters the first water inlet pipe 200 for enhanced heating; when the temperature drops, the spiral structure 740 cools and resets, and the rotating plate 730 rotates to cause the two through holes to be offset and closed, thereby blocking the backflow of low-temperature water.

[0091] It should be noted that the spiral structure 740 is made of a temperature memory alloy.

[0092] In this embodiment, the gas collection pipeline 500 passes through a portion of the valve body 710 where a spiral structure 740 is provided.

[0093] like Figure 3 As shown, the movable assembly 800 includes a third baffle 810 and an elastic member 820. The third baffle 810 is positioned in the cavity 110 via the elastic member 820 and is movable axially along the housing 100. The third baffle 810 divides the cavity 110 into a first chamber 111 and a second chamber 112. When the gap between the first water inlet pipe 200 increases due to high temperatures, the first water inlet pipe 200 pushes the third baffle 810 to compress the elastic member 820, causing it to move axially, connecting the first chamber 111 with the gas collection pipe 500 and simultaneously triggering the temperature control valve to open. At low temperatures, the gap between the first water inlet pipe 200 decreases, and the elastic member 820 pushes the third baffle 810 back to its original position.

[0094] In this embodiment, the elastic member 820 is preferably a high temperature resistant spring.

[0095] It should be noted that, in this document, the terms "comprises," "includes," or any other variations thereof are intended to encompass non-exclusive inclusion, such that a process, method, article, or apparatus comprising a series of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of other identical elements in the process, method, article, or apparatus comprising the element.

[0096] Furthermore, it should be noted that the scope of the methods and apparatuses in the embodiments of the present application is not limited to performing functions in the order shown or discussed, but may also include performing functions substantially simultaneously or in reverse order depending on the functions involved. For example, the methods described may be performed in an order different from that described, and various steps may be added, omitted, or combined. Furthermore, features described with reference to certain examples may be combined in other examples.

[0097] The above are only specific embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with this technical field can easily think of changes or replacements within the technical scope disclosed by the present invention, which should be covered by the scope of protection of the present invention.

Claims

1. A double coil condensing water heater, characterized in that: include: The shell has a cavity; the shell also has an air intake assembly connected to the cavity to allow combustible gas to enter the cavity; a first water inlet pipe spirally disposed in the cavity; as the temperature in the cavity increases, the gap between the pipe walls of the first water inlet pipe increases, and as the temperature in the cavity decreases, the gap between the pipe walls of the first water inlet pipe decreases; a second water inlet pipe, spirally arranged in the cavity and located outside the first water inlet pipe; an ignition needle, disposed in the housing to cause the combustible gas in the cavity to burn; The first water inlet pipe and the second water inlet pipe are respectively connected to an external water source, and the water outlet of the second water inlet pipe is also connected to the water inlet of the first water inlet pipe through a return pipe, so that the water flow in the second water inlet pipe enters the first water inlet pipe.

2. A double-coil condensing water heater according to claim 1, characterized in that: The air intake assembly includes an air intake portion and an air outlet portion; the air intake portion is connected to the air outlet portion, the air intake portion is located outside the shell, and the air outlet portion is located in the cavity; Wherein, the first water inlet pipe is arranged around the air outlet.

3. A double-coil condensing water heater according to claim 2, characterized in that: The air outlet portion includes an inner tube and an outer tube; the inner tube is arranged in the outer tube and there is a gap between the inner tube and the outer tube; The circumferential wall of the inner cylinder has a plurality of first air outlet holes, and the circumferential wall of the outer cylinder has a plurality of second air outlet holes. The aperture of the first air outlet holes is larger than the aperture of the second air outlet holes.

4. A double-coil condensing water heater according to claim 1, characterized in that: The double-coil condensing water heater further includes an intermediate pipe, which is disposed in the cavity; The middle pipe extends to the inner side of the first water inlet pipe, and both ends are communicated with the second water inlet pipe respectively.

5. A double-coil condensing water heater according to claim 4, characterized in that: The second water inlet pipe is provided with a first partition, and the first partition divides the second water inlet pipe into a first flow channel and a second flow channel; One end of the intermediate pipeline is communicated with the second flow channel, and the other end of the intermediate pipeline is communicated with the first flow channel or the second flow channel through a three-way temperature control valve.

6. A double-coil condensing water heater according to claim 5, characterized in that: The direction of water flow in the first flow channel is opposite to the direction of water flow in the second flow channel; and / or, the portion of the intermediate pipe extending into the first water inlet pipe is spiral-shaped; and / or, the volume of the second water inlet pipe is greater than the volume of the first water inlet pipe; And / or, the volume of the first flow channel is greater than the volume of the second flow channel.

7. The double-coil condensing water heater according to claim 1, characterized in that: The double-coil condensing water heater also includes a gas collecting pipe, a moving component and a temperature control valve component; The temperature-controlled valve assembly is connected to the return pipe, the gas collecting pipe passes through the temperature-controlled valve assembly, and its air inlet and air outlet are respectively connected to the cavity; the movable assembly is disposed in the cavity and divides the cavity into a first chamber and a second chamber; the movable assembly is movable along the axial direction of the housing; During the process of increasing the width of the gap between the pipe walls of the first water inlet pipe, the pipe wall of the first water inlet pipe drives the moving assembly to move, the air inlet of the gas collecting pipe is located in the first chamber, and the temperature control valve assembly is opened; during the process of decreasing the width of the gap between the pipe walls of the first water inlet pipe, the moving assembly is reset, the air inlet of the gas collecting pipe is located in the second chamber, and the temperature control valve assembly is closed; Wherein, the first water inlet pipe and the second water inlet pipe are arranged in the first chamber.

8. The double-coil condensing water heater according to claim 7, characterized in that: The temperature control valve assembly includes a valve body, a rotating plate and a spiral structure; The valve body is connected to the return pipe, a second partition is provided in the valve body, and the second partition has a first through hole; the rotating plate is rotatably provided on the second partition, and the rotating plate has a second through hole; The spiral structure is disposed in the valve body and connected to the rotating plate. The spiral structure rotates when heated to drive the rotating plate to rotate, thereby connecting or closing the first through hole and the second through hole. Wherein, the gas collecting pipeline passes through the portion of the valve body where the spiral structure is provided.

9. The double-coil condensing water heater according to claim 7, characterized in that: The moving assembly includes a third partition and an elastic member; the third partition is arranged in the cavity through the elastic member and can move along the axial direction of the shell; The third partition wall divides the cavity into the first chamber and the second chamber.

10. The double-coil condensing water heater according to claim 1, characterized in that: The first water inlet pipe is provided with a spiral bracket made of a temperature memory alloy; Alternatively, the first water inlet pipe is made of a temperature memory alloy.

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