Water heater

Abstract

The invention discloses a water heater which comprises a shell provided with a first side wall and a second side wall which are opposite in the width direction, and a first containing area located between the first side wall and the second side wall; the combustion heat exchange system is arranged in the first containing area, one side of the combustion heat exchange system is arranged close to the first side wall, a second containing area is formed between the other side of the combustion heat exchange system and the second side wall, and the combustion heat exchange system is at least provided with a first-stage heat exchange runner; the small flow valve is arranged in the second containing area and comprises a valve body and a control component arranged on the valve body, and the valve body is provided with a first flow channel communicating with the water inlet end of the first-stage heat exchange flow channel, a second flow channel communicating with the water outlet end of the first-stage heat exchange flow channel and a bypass flow channel communicating the first flow channel with the second flow channel. And the control part is used for controlling the water flow of the bypass flow channel. According to the technical scheme, the problem of start-stop constant temperature difference can be solved without arranging a water tank, meanwhile, the size of the water heater can be reduced, the start-up heating reaction speed is increased, and energy consumption is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of household appliances, in particular to a water heater. Background Art

[0002] In the related art, the water inlet pipe and the water outlet pipe of the water heater are arranged on the opposite sides of the combustion heat exchange system respectively. The pipe layout is relatively dispersed, and the occupied space in the shell is relatively large. In order to solve the problem of constant temperature difference between start and stop, it is usually necessary to connect a larger water tank to the water outlet pipe, which further increases the occupied space in the shell, making the overall volume of the water heater larger, which is not conducive to the miniaturization of the water heater. At the same time, the water heater is equipped with a water tank, which will also cause the water heater to start up and heat up slowly. Each time the water tank is turned on to heat up, gas will be wasted, resulting in increased energy consumption. Summary of the invention

[0003] The main purpose of the present invention is to provide a water heater, which aims to solve the problem of start-stop constant temperature difference without setting a water tank, and at the same time can reduce the volume of the water heater, increase the startup heating reaction speed, and reduce energy consumption.

[0004] To achieve the above object, the water heater proposed by the present invention comprises:

[0005] A housing having a first side wall and a second side wall that are opposite to each other and spaced apart in a width direction, and a first accommodating area between the first side wall and the second side wall;

[0006] a combustion heat exchange system, which is arranged in the first accommodating area, one side of the combustion heat exchange system is arranged close to the first side wall, a second accommodating area is formed between the other side of the combustion heat exchange system and the second side wall, and the combustion heat exchange system has at least one primary heat exchange flow channel; and

[0007] A small flow valve is arranged in the second accommodating area, and the small flow valve includes a valve body and a control component arranged on the valve body. The valve body has a first flow channel connected to the water inlet end of the first-level heat exchange flow channel, a second flow channel connected to the water outlet end of the first-level heat exchange flow channel, and a bypass flow channel connecting the first flow channel with the second flow channel. The control component is used to control the water flow rate of the bypass flow channel.

[0008] In one embodiment, the water heater further comprises an electric control module disposed in the second accommodation area, the small flow valve and the electric control module are both located on the same side of the combustion heat exchange system, and the combustion heat exchange system and the small flow valve are electrically connected to the electric control module respectively;

[0009] And / or, a heat insulating member is provided on a side of the second accommodating area close to the combustion heat exchange system;

[0010] And / or, a side of the combustion heat exchange system close to the first side wall is arranged directly opposite to the first side wall.

[0011] In one of the embodiments, the shell further includes a back plate connected between the first side wall and the second side wall, and the valve body is provided with a connecting portion, and the connecting portion is connected and fixed to the back plate.

[0012] In one embodiment, the bypass ratio of the small flow valve ranges from 40% to 70%, and the bypass ratio is the ratio of the water flow entering the bypass channel through the first channel to the water flow entering the primary heat exchange channel through the first channel.

[0013] In one embodiment, the shell also includes a bottom wall, and the two sides of the bottom wall are respectively connected to the bottom side of the first side wall and the bottom side of the second side wall, and a third accommodating area is formed between the bottom side of the combustion heat exchange system and the bottom wall. The water heater also includes a fan arranged in the third accommodating area, and the fan is connected to the burner of the combustion heat exchange system, and the fan is used to blow air into the burner.

[0014] In one embodiment, the water heater also includes an air intake module arranged in the third accommodating area, the fan and the air intake module are arranged side by side along the width direction of the shell, the bottom wall is provided with an air intake connector connected to the air intake end of the air intake module, the air outlet end of the air intake module is connected to the burner, and the air intake module is used to transport combustion gas to the burner.

[0015] In one embodiment, a fourth accommodating area is further provided in the shell, and the fourth accommodating area is located below the second accommodating area, and the fourth accommodating area is located on the side of the third accommodating area close to the second side wall, and the fourth accommodating area connects the second accommodating area with the third accommodating area. The water heater also includes a water inlet module provided in the fourth accommodating area, and the bottom wall is provided with a water inlet joint connected to the water inlet end of the water inlet module, and the water outlet end of the water inlet module is connected to the water inlet end of the first flow channel.

[0016] In one embodiment, the water heater also includes a water outlet pipe connected to the water outlet end of the second flow channel, the water outlet pipe includes a first pipe section extending downward from the valve body, and a second pipe section bent from the bottom end of the first pipe section toward the first side wall and extending downward at an angle, the first pipe section is located in the second accommodating area, the second pipe section extends through the fourth accommodating area to the third accommodating area, and the bottom wall is provided with a water outlet joint connected to the water outlet end of the second pipe section.

[0017] In one embodiment, the valve body includes a first tube body, a second tube body and a bypass tube body, the first tube body and the second tube body are arranged in parallel along the height direction of the shell, the bypass tube body is connected between the first tube body and the second tube body, the first tube body constructs the first flow channel, the second tube body constructs the second flow channel, the bypass tube body constructs the bypass flow channel, the control component is arranged on the bypass tube body, and the control component is a solenoid valve or a proportional valve;

[0018] And / or, the combustion heat exchange system includes a coilless heat exchanger, which includes a plurality of heat exchange tubes and heat exchange fins sleeved on the periphery of the plurality of heat exchange tubes, the plurality of heat exchange tubes are arranged along the thickness direction of the shell to form a single-layer heat exchange tube structure, and the plurality of heat exchange tubes are connected in sequence to form a heat exchange flow channel; on the axial projection surface of the heat exchange tube, the minimum distance between any point on the heat exchange fin and the outer tube wall of the heat exchange tube is not greater than 3 mm.

[0019] In one embodiment, the combustion heat exchange system includes a box body, a burner and a primary heat exchanger, the burner and the primary heat exchanger are both arranged in the box body, the primary heat exchanger is located above the burner, and the area between the primary heat exchanger and the burner forms a combustion chamber, the primary heat exchanger has the primary heat exchange channel, the primary heat exchanger is provided with a first water inlet and a first water outlet on the side facing the second side wall, the primary heat exchange channel connects the first water inlet and the first water outlet, the water outlet end of the first channel is connected to the first water inlet through a first connecting pipe, and the water inlet end of the second channel is connected to the first water outlet through a second connecting pipe.

[0020] In one embodiment, the combustion heat exchange system also includes a secondary heat exchanger, which has a secondary heat exchange flow channel. The secondary heat exchanger is arranged at the top of the box body, and the top of the box body is provided with a smoke outlet connected to the secondary heat exchanger. The secondary heat exchanger is provided with a second water inlet and a second water outlet at a position close to the second accommodating area. The secondary heat exchanger connects the second water inlet and the second water outlet. The second water inlet is connected to a water inlet pipe, and the second water outlet is connected to the water inlet end of the first flow channel through a third connecting pipe.

[0021] In one embodiment, the water heater also includes a condensate collecting device disposed in the shell, the condensate collecting device is located below the secondary heat exchanger and on the same side as the small flow valve, and the secondary heat exchanger is also provided with a condensate outlet near the second accommodating area, and the condensate outlet is connected to the condensate collecting device through a drain pipe.

[0022] The technical solution of the present invention is to provide a first accommodating area and a second accommodating area in the shell, and the first accommodating area and the second accommodating area are arranged side by side along the width direction of the shell. By reasonably partitioning the interior of the shell, the arrangement of the various components in the shell is neat and orderly, which is conducive to fully utilizing the space in the shell and reducing the occupied space. The combustion heat exchange system is arranged in the first accommodating area in the shell, one side of the combustion heat exchange system is arranged close to the first side wall, and the other side of the combustion heat exchange system forms a second accommodating area between the second side wall, and the second accommodating area can be used to accommodate a small flow valve, and the valve body of the small flow valve is integrated with a first flow channel, a second flow channel and a bypass flow channel. The flow channel integration of the valve body is high, so that the pipeline between the combustion heat exchange system and the small flow valve can be centrally arranged in the second accommodating area, without arranging pipelines on the side of the combustion heat exchange system close to the first side wall, and without setting other bypass pipelines, which can simplify the pipeline layout, improve the compactness of the pipeline layout, and help to further reduce the width size of the water heater. In addition, by using a small flow valve with a bypass function to replace the traditional water tank, it can not only solve the problem of constant temperature difference when the water heater is started and stopped, but also compared with the water tank, the small flow valve is smaller in size and occupies less space, which is conducive to further reducing the size of the water heater. In addition, the water heater of this solution does not need to be equipped with a water tank, which can greatly increase the startup heating speed and meet the user's demand for fast heating; in addition, it can avoid wasting gas every time the water tank is turned on to heat, which can reduce energy consumption and reduce the user's cost of use. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. 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 the structures shown in these drawings without paying creative work.

[0024] Figure 1 It is a structural schematic diagram of an embodiment of a water heater of the present invention;

[0025] Figure 2 for Figure 1 A schematic diagram of the structure of the medium-sized water heater without the shell cover;

[0026] Figure 3 for Figure 2 Schematic diagram of the assembly structure of the combustion heat exchange system and the small flow valve;

[0027] Figure 4 for Figure 3 Schematic diagram of the internal structure of the box of the combustion heat exchange system;

[0028] Figure 5 for Figure 3 Side view of the combustion heat exchange system;

[0029] Figure 6 for Figure 5 The schematic diagram of the structure after omitting the drain pipe and condensate collection device;

[0030] Figure 7 for Figure 4 Schematic diagram of the structure of small and medium-sized flow valves;

[0031] Figure 8 for Figure 7 Schematic diagram of the cross-section structure of small and medium-sized flow valves;

[0032] Fig. 9 for Figure 4 Schematic diagram of the structure of the middle stage heat exchanger;

[0033] Fig.10 for Fig. 9 Schematic diagram of the cross-sectional structure of the middle-stage heat exchanger;

[0034] Fig.11 for Fig.10 Schematic diagram of the structure of the heat exchanger;

[0035] Fig.12 for Fig.10 Schematic diagram of the structure of the spoiler.

[0036] Description of Figure Numbers:

[0037]

[0038]

[0039] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0040] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0041] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture. If the specific posture changes, the directional indication will also change accordingly.

[0042] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features limited to "first" and "second" may explicitly or implicitly include at least one of the features. In addition, if "and / or" or "and / or" appears in the full text, its meaning includes three parallel solutions. Taking "A and / or B" as an example, it includes solution A, solution B, or solutions that satisfy both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0043] The present invention provides a water heater 100 .

[0044] Please refer to Figures 1 to 3 ,as well as Figure 8 In one embodiment of the present invention, the water heater 100 includes a shell 10, a combustion heat exchange system 20 and a small flow valve 30. The shell 10 has a first side wall 11 and a second side wall 12 that are opposite and spaced apart in the width direction, and a first accommodation area 101 located between the first side wall 11 and the second side wall 12; the combustion heat exchange system 20 is arranged in the first accommodation area 101, one side of the combustion heat exchange system 20 is arranged close to the first side wall 11, and a second accommodation area 102 is formed between the other side of the combustion heat exchange system 20 and the second side wall 12, and the combustion heat exchange system 20 has at least one primary heat exchange flow channel The small flow valve 30 is arranged in the second accommodating area 102, and the small flow valve 30 includes a valve body 31 and a control component 32 arranged on the valve body 31. The valve body 31 has a first flow channel 301 connected to the water inlet end of the first-level heat exchange flow channel, a second flow channel 302 connected to the water outlet end of the first-level heat exchange flow channel, and a bypass flow channel 303 connecting the first flow channel 301 with the second flow channel 302. The control component 32 is used to control the water flow rate of the bypass flow channel 303.

[0045] Specifically, the shell 10 can be designed as a rectangular structure so that the overall shape of the water heater 100 is regular, which is convenient for installing the water heater 100 on a wall or a corner. Of course, the shell 10 can also be designed in other shapes, which are not specifically limited here. Among them, the width direction of the shell 10 can be the left-right direction, the thickness direction of the shell 10 can be the front-back direction, and the height direction of the shell 10 can be the up-down direction. The shell 10 can specifically include a shell body 10a with an open front side, and a cover 10b covering the front side of the shell body 10a, and the shell body 10a and the cover 10b are enclosed to form an installation cavity for installing components such as a combustion heat exchange system 20, a small flow valve 30 and a fan 50. The water heater 100 can specifically be a strong drum type water heater 100 with the fan 50 placed below, or a strong extraction type water heater 100 with the fan 50 placed above, which is not specifically limited here. The shell 10 is provided with a first accommodation area 101 for accommodating the combustion heat exchange system 20 and a second accommodation area 102 for accommodating the small flow valve 30. The first accommodation area 101 and the second accommodation area 102 are arranged side by side along the width direction (such as the left and right direction) of the shell 10. Among them, the second accommodation area 102 is located on the side of the first accommodation area 101 close to the second side wall 12 (such as the right side wall of the shell 10). By reasonably partitioning the interior of the shell 10, the arrangement of the various components in the shell 10 is neat and orderly, which is conducive to fully utilizing the space in the shell 10 and reducing the occupied space.

[0046] The combustion heat exchange system 20 is arranged in the first accommodating area 101 in the shell 10, and one side of the combustion heat exchange system 20 is arranged close to the first side wall 11, and a second accommodating area 102 is formed between the other side of the combustion heat exchange system 20 and the second side wall 12. The second accommodating area 102 can be used to accommodate a small flow valve 30, and the valve body 31 of the small flow valve 30 is integrated with multiple flow channels such as a first flow channel 301, a second flow channel 302 and a bypass flow channel 303. The flow channel integration of the valve body 31 is high, so that the pipeline between the combustion heat exchange system 20 and the small flow valve 30 can be concentrated in the second accommodating area 102. There is no need to arrange pipelines on the side of the combustion heat exchange system 20 close to the first side wall 11, and there is no need to set up other bypass pipelines. The pipeline layout can be simplified and the compactness of the pipeline layout is improved, which is conducive to further reducing the width of the water heater 100.

[0047] The combustion heat exchange system 20 may specifically include a burner 22 and a heat exchanger, a heat exchange channel is formed inside the heat exchanger, and the high-temperature flue gas generated by the burner 22 contacts the surface of the heat exchanger to achieve heat exchange, thereby heating the water in the heat exchange channel to achieve the hot water function. The number of heat exchangers may be set to one or more according to actual needs. For example, in this embodiment, the heat exchanger may specifically include a primary heat exchanger 23 and a secondary heat exchanger 24. The primary heat exchanger 23 has a primary heat exchange channel, and the secondary heat exchanger 24 has a secondary heat exchange channel, which can achieve two-stage heat exchange and improve the utilization rate of thermal energy.

[0048] Among them, Figure 7 and Figure 8 As shown, the small flow valve 30 includes a valve body 31 and a control component 32. The valve body 31 can be made of metal or plastic parts with high structural strength. Optionally, the valve body 31 is formed by plastic injection molding or 3D printing, which can easily manufacture a valve body 31 with a smaller volume, and is also conducive to the lightweight of the valve body 31. Optionally, the surface of the valve body 31 is provided with a heat insulation coating or an anti-corrosion coating, so that the valve body 31 can adapt to complex installation environments, thereby extending the service life of the valve body 31. Specifically, the valve body 31 integrates a first flow channel 301, a second flow channel 302 and a bypass flow channel 303. The first flow channel 301 can be used as a cold water inlet flow channel to transport cold water to the primary heat exchange flow channel of the combustion heat exchange system 20. The second flow channel 302 can be used as a hot water outlet flow channel to output the hot water in the primary heat exchange flow channel. The bypass flow channel 303 can also transport the cold water in the first flow channel 301 to the second flow channel 302, so that the cold water is mixed with the hot water in the second flow channel 302, thereby realizing the bypass mixing function. The control component 32 is used to control the water flow rate of the bypass flow channel 303. It should be noted that the control component 32 controls the water flow rate of the bypass flow channel 303, which should be understood as the water flow rate through the bypass flow channel 303 can be changed to a certain extent under the control of the control component 32. The water flow change here can be a change between no flow and flow, or a change between a large flow and a small flow in the case of flow. The control component 32 includes but is not limited to a solenoid valve, a proportional valve, and the like.

[0049] The control component 32 of the small flow valve 30 can be electrically connected to the control system of the water heater 100 in a wired or wireless manner. The control system sends corresponding control instructions to the control component 32 according to the working state of the water heater 100, and then the water flow rate of the bypass flow channel 303 can be controlled through the control component 32, so that the bypass mixed water volume of the water heater 100 can be adjusted according to the actual working conditions to meet different application scenarios, thereby effectively improving the problems of the traditional water heater 100 such as the start-stop constant temperature difference, high vaporization noise, and low thermal efficiency.

[0050] For example, when the water heater 100 is working normally, the control component 32 controls the closing of the bypass flow channel 303. At this time, the highest temperature in the heat exchange tube 234 (that is, the heat exchange flow channel) of the heat exchanger is the set temperature of the water heater 100. In this way, the risk of vaporization noise can be greatly reduced, and the thermal efficiency of the heat exchanger will not be affected, and the service life of the heat exchanger can also be extended.

[0051] After the water supply to the water heater 100 is stopped, the control component 32 controls the bypass flow channel 303 to be opened, and can close the bypass flow channel 303 within a few seconds of startup according to the actual working conditions. At this time, part of the cold water in the first flow channel 301 is transported to the second flow channel 302 via the bypass flow channel 303, and the cold water is mixed with the high-temperature water in the second flow channel 302, which can effectively reduce the temperature rise when the water supply is stopped; because part of the cold water is diverted from the bypass flow channel 303, the water flow rate transported from the first flow channel 301 to the heat exchanger is reduced, thereby reducing the overshoot at startup.

[0052] In addition, it is also possible to determine whether to open the bypass during normal combustion based on the actual working conditions. For example, in winter, when the temperature difference between the inlet and outlet water is large and needs to be quickly heated to the set temperature, the control component 32 controls the closure of the bypass flow channel 303. At this time, the heating speed is improved and it is guaranteed that the set temperature can be heated. When the water is stopped and restarted, the bypass time can be reduced, thereby reducing the overshoot; when a low-temperature bath is needed in summer, the control component 32 controls the opening of the bypass flow channel 303. At this time, the minimum temperature rise of the water heater 100 can be reduced to prevent the water temperature from being too hot during bathing, and the water temperature in the heat exchange tube 234 can be increased, thereby increasing the flue gas temperature and avoiding the risk of condensation water.

[0053] It is understandable that a conventional water heater is usually connected to a water tank in the water outlet pipe. By storing water at a predetermined temperature in the water tank, when the water heater is working, the hot water output from the water outlet of the combustion heat exchange system will first enter the water tank and mix with the water in the water tank. By controlling the water temperature in the water tank, the constant temperature performance of the water outlet can be guaranteed, and the problem of the start-stop constant temperature difference of the water heater can be solved. However, the water tank usually has a large volume and occupies a large space in the shell. For example, in the water heater with a water tank in the related art, the water tank is usually arranged below the combustion heat exchange system and the fan, so that the height of the shell is large, and the height of the whole machine reaches about 600mm. In this embodiment, by using a small flow valve 30 with a bypass function to replace the traditional water tank, not only can the problem of the start-stop constant temperature difference of the water heater 100 be solved, but also compared with the water tank, the small flow valve 30 is smaller in volume and occupies less space, which is conducive to reducing the volume of the water heater 100. For example, in this solution, by arranging the small flow valve 30 and the combustion heat exchange system 20 side by side along the width direction of the shell 10, it is helpful to reduce the height dimension of the shell 10, so that the height of the whole machine can reach about 540mm. Compared with the traditional water heater 100, the height of the whole machine can be shortened by about 60mm, which is conducive to the miniaturization of the water heater 100. In addition, the water heater 100 of this solution does not need to be equipped with a water tank, which can greatly improve the startup heating speed and meet the user's quick heating needs; in addition, it can avoid wasting gas by heating the water tank every time it is started, which can reduce energy consumption, meet the user's energy-saving needs, and reduce the user's use cost.

[0054] The technical solution of the present invention is to provide a first accommodating area 101 and a second accommodating area 102 in the housing 10, and the first accommodating area 101 and the second accommodating area 102 are arranged side by side along the width direction of the housing 10. By rationally partitioning the interior of the housing 10, the arrangement of the various components in the housing 10 is neat and orderly, which is conducive to fully utilizing the space in the housing 10 and reducing the occupied space. The combustion heat exchange system 20 is arranged in the first accommodating area 101 in the shell 10, and one side of the combustion heat exchange system 20 is arranged close to the first side wall 11, and a second accommodating area 102 is formed between the other side of the combustion heat exchange system 20 and the second side wall 12. The second accommodating area 102 can be used to accommodate a small flow valve 30, and the valve body 31 of the small flow valve 30 is integrated with multiple flow channels such as a first flow channel 301, a second flow channel 302 and a bypass flow channel 303. The flow channel integration of the valve body 31 is high, so that the pipeline between the combustion heat exchange system 20 and the small flow valve 30 can be concentrated in the second accommodating area 102. There is no need to arrange pipelines on the side of the combustion heat exchange system 20 close to the first side wall 11, and there is no need to set up other bypass pipelines. The pipeline layout can be simplified and the compactness of the pipeline layout is improved, which is conducive to further reducing the width of the water heater 100. Furthermore, by adopting a small flow valve 30 with a bypass function to replace the traditional water tank, not only can the problem of constant temperature difference between start and stop of the water heater 100 be solved, but also compared with the water tank, the small flow valve 30 is smaller in size and occupies less space, which is conducive to further reducing the size of the water heater 100. In addition, the water heater 100 does not need to be equipped with a water tank, which can greatly improve the startup heating speed and meet the user's demand for fast heating; in addition, it can avoid wasting gas every time the water tank is heated, which can reduce energy consumption and reduce the user's use cost.

[0055] It is understandable that in a conventional water heater, a water inlet pipe and a water outlet pipe are respectively arranged on opposite sides of the combustion heat exchange system, so that a space for the water inlet pipe or the water outlet pipe to pass through is reserved between the side of the combustion heat exchange system and the first side wall. In this way, the combustion heat exchange system is not directly opposite to the first side wall, and the distance between the two is relatively large, thereby making the width dimension of the shell larger. In one embodiment, the side of the combustion heat exchange system 20 close to the first side wall 11 is directly opposite to the first side wall 11. That is, the side of the combustion heat exchange system 20 is arranged close to the first side wall 11 and there is no other physical component (such as a pipe) blocking the two, which is conducive to reducing the distance between the combustion heat exchange system 20 and the first side wall 11, thereby reducing the width dimension of the shell 10.

[0056] like Figure 2As shown, in one embodiment, the water heater 100 further includes an electric control module 40 disposed in the second accommodation area 102, the small flow valve 30 and the electric control module 40 are both located on the same side of the combustion heat exchange system 20, and the combustion heat exchange system 20 and the small flow valve 30 are electrically connected to the electric control module 40 respectively. In this embodiment, the small flow valve 30 and the electric control module 40 are both accommodated in the second accommodation area 102 and are located on the same side of the combustion heat exchange system 20, which can make full use of the same side space of the combustion heat exchange system 20, which is conducive to maximizing the space utilization of the second accommodation area 102, and the combustion heat exchange system 20 and the small flow valve 30 are disposed adjacent to the electric control module 40, which is convenient for electrically connecting the combustion heat exchange system 20 and the small flow valve 30 with the electric control module 40. Among them, the electric control module 40 may specifically include a bracket disposed opposite to the second side wall 12 and spaced apart, and an electric control board disposed on the bracket.

[0057] like Figure 2 As shown, in one embodiment, a heat insulating member 213 is provided on a side of the second accommodating area 102 close to the combustion heat exchange system 20. The heat insulating member 213 can block the heat radiated from the combustion heat exchange system 20, preventing the heat from radiating into the second accommodating area 102 and causing damage to the components in the second accommodating area 102 (such as the small flow valve 30, the pipeline structure, the electric control module 70, etc.). For example, the small flow valve 30 and the electric control module 40 are both located on the side of the heat insulating member 213 away from the combustion heat exchange system 20. The heat insulating member 213 can be thermally blocked from the heat radiated from the combustion heat exchange system 20, preventing the heat radiated from the combustion heat exchange system 20 from damaging the small flow valve 30 and the electric control module 40, which is beneficial to prolonging the life of the small flow valve 30 and the electric control module 40, and thus prolonging the service life of the water heater 100. There are multiple ways to set the heat insulating member 213. For example, an independent heat insulating member 101 may be provided between the combustion heat exchange system 20 and the second accommodation area 102 for heat insulation, wherein the heat insulating member 101 includes but is not limited to a solid heat insulating board made of heat insulating material, or a hollow heat insulating board with a hollow heat insulating interlayer. Alternatively, the side wall of the box body 21 of the combustion heat exchange system 20 facing the second accommodation area 102 may be provided with a double-layer plate structure with an air cooling channel to form a heat insulating member 213; alternatively, the outer wall surface of the box body 21 of the combustion heat exchange system 20 facing the second accommodation area 102 may be coated with a heat insulating coating to form a heat insulating member 213.

[0058] like Figure 2 As shown, in one embodiment, the shell 10 further includes a back plate 14 connected between the first side wall 11 and the second side wall 12 , and the valve body 31 is provided with a connecting portion, which is connected and fixed to the back plate 14 .

[0059] In this embodiment, after the water heater 100 is installed on the wall, the back plate 14 is located on the side of the water heater 100 close to the wall, and the valve body 31 is connected and fixed to the back plate 14 through the connecting part, so that the installation of the small flow valve 30 is more stable and reliable, and the small flow valve 30 is prevented from shaking during the operation of the water heater 100, thereby ensuring the working reliability of the small flow valve 30. Among them, the connection part and the back plate 14 are fixed in a manner including but not limited to a snap connection or a fastener connection. For example, the valve body 31 can be an injection molded part, and the connection part is integrally injection molded on the side of the valve body 31 close to the back plate 14 (for example, the circumference of the first tube body 311), and the connection part and the back plate 14 are correspondingly provided with assembly holes for fasteners (such as screws, or pins, etc.) to pass through, and the connection part is connected and fixed to the back plate 14 by fasteners, and the assembly is simple, convenient, stable and reliable.

[0060] In one embodiment, the bypass ratio of the small flow valve 30 ranges from 40% to 70%, and the bypass ratio is the ratio of the water flow entering the bypass channel 303 through the first channel 301 to the water flow entering the primary heat exchange channel through the first channel 301.

[0061] It is understandable that when the bypass ratio is too large, during the process of starting the water heater to heat, too much water will flow from the bypass flow channel 303 into the second flow channel 302, which will produce serious vaporization noise, reduce the thermal efficiency of the heat exchanger, affect the user experience, and affect the life of the heat exchanger; when the bypass ratio is too small, the amount of water flowing from the bypass flow channel 303 into the second flow channel 302 is too small to neutralize the high-temperature water in the second flow channel 302. This solution can more effectively improve the problems of start-stop constant temperature difference, high vaporization noise, low thermal efficiency, etc. of traditional water heaters by limiting the range of the bypass ratio of the small flow valve 200.

[0062] In one embodiment, the control component 32 is used to control the water flow rate of the bypass channel 303 according to the preset bypass time and the bypass ratio, and the bypass time ranges from 2 seconds to 4 seconds. By controlling the bypass time and the bypass ratio, this solution can more effectively control the water flow rate of the bypass channel 303, thereby accurately controlling the outlet water temperature of the water heater, and further improving the problems of the start-stop constant temperature difference, high vaporization noise, and low thermal efficiency of traditional water heaters. Among them, the bypass time can be 2 seconds, or 3 seconds, or 4 seconds, etc., which are not specifically limited here.

[0063] like Figure 2 and Figure 4As shown, in one embodiment, the shell 10 also has a bottom wall 13, and the two sides of the bottom wall 13 are respectively connected to the bottom side of the first side wall 11 and the bottom side of the second side wall 12, and a third accommodating area 103 is formed between the bottom side of the combustion heat exchange system 20 and the bottom wall 13. The water heater 100 also includes a fan 50 arranged in the third accommodating area 103, and the fan 50 is connected to the burner 22 of the combustion heat exchange system 20, and the fan 50 is used to blow air into the burner 22.

[0064] In this embodiment, the housing 10 includes a housing body 10a and a cover 10b, wherein the housing body 10a includes a first side wall 11 and a second side wall 12 which are arranged oppositely and spaced apart in the width direction, a bottom wall 13 connected to the bottom side of the first side wall 11 and the bottom side of the second side wall 12, a top wall connected to the top side of the first side wall 11 and the top side of the second side wall 12, and a back plate 14 connected to the first side wall 11 and the second side wall 12 on the side away from the cover 10b, so that the housing body 10a is generally a rectangular box-shaped structure with an open front side, and the cover 10b is detachably covered on the front side of the housing body 10a. The area between the bottom side of the combustion heat exchange system 20 and the bottom wall 13 forms a third accommodating area 103, and the fan 50 is arranged in the third accommodating area 103, that is, in this embodiment, the water heater 100 is a strong drum type water heater 100 with the fan 50 placed below. The air outlet of the fan 50 is connected to the burner 22 of the combustion heat exchange system 20. When the water heater 100 is working, air is blown into the burner 22 through the fan 50, so as to achieve secondary air replenishment, which is conducive to achieving full combustion, and the upward flow of the air blown in by the fan 50 is conducive to pushing the high-temperature flue gas generated by the burner 22 to flow upward to fully exchange heat with the heat exchanger (such as the primary heat exchanger 23 and the secondary heat exchanger 24), thereby improving the heat exchange efficiency. Of course, in some embodiments, a third accommodating area 103 for accommodating the fan 50 can also be formed between the top side of the combustion heat exchange system 20 and the top wall of the shell 10. In this case, the water heater 100 is a strong extraction type water heater 100 with the fan 50 placed on it.

[0065] like Figure 2 As shown, in one embodiment, the water heater 100 also includes an air intake module 60 arranged in the third accommodating area 103, the fan 50 and the air intake module 60 are arranged side by side along the width direction of the shell 10, and the bottom wall 13 is provided with an air intake connector 14 connected to the air intake end of the air intake module 60, and the air outlet end of the air intake module 60 is connected to the burner 22, and the air intake module 60 is used to transport combustion gas to the burner 22.

[0066] In this embodiment, the air intake connector 14 is used to communicate with the external gas pipeline, and the combustion gas formed by the mixture of gas and air can be delivered to the burner 22 for combustion through the air intake module 60. Among them, the air intake module 60 may specifically include a gas proportional valve, a gas distribution rod, etc. The fan 50 and the air intake module 60 are arranged side by side in the third accommodating area 103, which is conducive to maximizing the space utilization of the third accommodating area 103. In addition, the fan 50 and the air intake module 60 are both arranged close to the bottom side of the combustion heat exchange system 20, which is conducive to the cooperation between the fan 50 and the air intake module 60 and the burner 22 of the combustion heat exchange system 20. Optionally, the fan 50 is located on the side of the air intake module 60 close to the first side wall 11. In this way, the space in the width direction of the housing 10 can be fully utilized to arrange the fan 50 and the air intake module 60. The fan 50 is arranged on the side close to the first side wall 11, and it is also convenient to set a mounting bracket at a position close to the first side wall 11 to fix the fan 50.

[0067] like Figure 2 As shown, in one embodiment, a fourth accommodating area 104 is further provided in the shell 10, and the fourth accommodating area 104 is located below the second accommodating area 102, and the fourth accommodating area 104 is located on the side of the third accommodating area 103 close to the second side wall 12, and the fourth accommodating area 104 connects the second accommodating area 102 with the third accommodating area 103, and the water heater 100 also includes a water inlet module 70 arranged in the fourth accommodating area 104, and the bottom wall 13 is provided with a water inlet connector 15 connected to the water inlet end of the water inlet module 70, and the water outlet end of the water inlet module 70 is connected to the water inlet end of the first flow channel 301.

[0068] In this embodiment, the fourth accommodating area 104 is located at the corner where the bottom wall 13 of the shell 10 intersects with the second side wall 12, and the second accommodating area 102, the fourth accommodating area 104 and the third accommodating area 103 are connected in sequence to form an "L"-shaped accommodating area. The water inlet module 70 is arranged in the fourth accommodating area 104, and the water inlet module 70 may specifically include a water pump 71, a flow sensor 72, a temperature sensor and a large and small water valve, or a combination of several of them. For example, the water inlet module 70 includes a water pump 71 and a flow sensor 72, wherein the water inlet end of the flow sensor 72 is connected to the water inlet connector 15, the water outlet end of the flow sensor 72 is connected to the water inlet end of the water pump 71, and the water outlet end of the water pump 71 is directly or indirectly connected to the water inlet end of the first flow channel 301 via the water inlet pipe 81. The water inlet module 70 can be reasonably arranged through the fourth accommodating area 104, so that the water inlet module 70 can be connected to the combustion heat exchange system 20 or the small flow valve 30 through pipelines, further improving the compactness of the pipeline layout.

[0069] like Figure 2 and Figure 3As shown, in one embodiment, the water heater 100 also includes a water outlet pipe 82 connected to the water outlet end of the second flow channel 302, and the water outlet pipe 82 includes a first pipe section 821 extending downward from the valve body 31, and a second pipe section 822 bent from the bottom end of the first pipe section 821 toward the first side wall 11 and extending downward at an angle, the first pipe section 821 is located in the second accommodating area 102, the second pipe section 822 extends through the fourth accommodating area 104 to the third accommodating area 103, and the bottom wall 13 is provided with a water outlet joint 16 connected to the water outlet end of the second pipe section 822.

[0070] In this embodiment, the water outlet connector 16 is used to connect with the user's water end (such as a shower, a faucet, etc.), and the hot water generated by the combustion heat exchange system 20 is transported to the water outlet pipe 82 via the second flow channel 302, and then transported to the user's water end by the water outlet connector 16. The water outlet pipe 82 includes a first pipe section 821 and a second pipe section 822 bent relative to the first pipe section 821, so that the space of the second accommodating area 102, the third accommodating area 103 and the fourth accommodating area 104 can be fully utilized to accommodate the water outlet pipe 82, so that the length of the water outlet pipe 82 can be designed to be longer, which is also conducive to setting the water outlet connector 16 as far away from the water inlet connector 15 as possible.

[0071] In order to further reduce the width of the water heater 100, as shown in FIG. Figure 2 As shown, in one embodiment, the maximum contour surface of the valve body 31 faces one side in the width direction of the housing 10. That is, the maximum contour surface of the valve body 31 faces the first side wall 11 or the second side wall 12. It should be noted that the maximum contour surface of the valve body 31 is the surface with the largest projection area in the six views of the valve body 31. For example, when the valve body 31 is set in an "H" shape, the "H" surface of the valve body 31 is the maximum contour surface of the valve body 31; for another example, when the valve body 31 is set in a rectangular waterway plate, the side with the largest area among the multiple side surfaces of the valve body 31 is the maximum contour surface of the valve body 31. The maximum contour surface of the valve body 31 faces one side in the width direction of the housing 10, which can prevent the valve body 31 from occupying too much space in the width direction of the housing 10, thereby facilitating further reducing the width dimension of the water heater 100.

[0072] There are many specific shapes of the valve body 31, such as Figure 7 and Figure 8As shown, in one embodiment, the valve body 31 includes a first tube body 311, a second tube body 312 and a bypass tube body 313, the first tube body 311 and the second tube body 312 are extended in parallel along the height direction of the shell 10, the bypass tube body 313 is connected between the first tube body 311 and the second tube body 312, the first tube body 311 constructs the first flow channel 301, the second tube body 312 constructs the second flow channel 302, the bypass tube body 313 constructs the bypass flow channel 303, the control component 32 is arranged on the bypass tube body 313, and the control component 32 is a solenoid valve or a proportional valve.

[0073] In this embodiment, the two ends of the bypass tube body 313 are respectively connected to the middle of the first tube body 311 and the middle of the second tube body 312, so that the valve body 31 generally presents an "H"-shaped structure, wherein the axis of the first tube body 311 and the axis of the second tube body 312 jointly define a reference plane relative to the first side wall 11, and the maximum contour surface of the valve body 31 is the "H" surface formed by the projection of the valve body 31 on the reference plane. The small flow valve 30 is set as an H valve, which has a simple structure and is easy to manufacture. Of course, in other embodiments, the valve body 31 is not limited to the H valve structure, as long as a corresponding flow channel is constructed inside the valve body 31, for example, the valve body 31 can also be set as a waterway plate. Among them, the control component 32 is a solenoid valve or a proportional valve. For example, the control component 32 can use a solenoid valve to control the on and off of the bypass flow channel 103, so that the bypass flow channel 103 can be switched between two gears with bypass flow and without bypass flow, and the adjustment is simple and convenient, and the response speed is fast. For another example, the control component 32 may be a proportional valve, which is equipped with a stepping motor to achieve continuous stepless regulation with higher regulation accuracy. Optionally, the control component 32 is only one of the solenoid valve and the proportional valve. In this way, the number of control components 32 can be simplified while ensuring the bypass flow regulation function, so that the overall structure of the small flow valve 30 is more streamlined and smaller in size, which is also conducive to reducing costs.

[0074] like Figure 7As shown, in one embodiment, the control component 32 is located in the cavity formed by the first tube body 311, the second tube body 312 and the bypass tube body 313. In this embodiment, the control component 32 is arranged on the peripheral wall of the bypass tube body 313, and the control component 32 is located between the first tube body 311 and the second tube body 312. In this way, the cavity area constructed by the valve body 31 itself can be fully utilized to accommodate the control component 32, so as to further improve the compactness of the overall structure and reduce the occupied space. Specifically, the first tube body 311, the second tube body 312 and the bypass tube body 313 together form an H-shaped structure, and the valve body 31 is respectively formed with cavities on the upper and lower sides corresponding to the bypass tube body 313. The control component 32 can be arranged in the cavity on the upper side of the bypass tube body 313, or the control component 32 can be arranged in the cavity on the lower side of the bypass tube body 313.

[0075] Optionally, the axis of the first tube body 311, the center line of the control component 32, and the axis of the second tube body 312 are parallel to each other, and the distance between the center line of the control component 32 and the axis of the first tube body 311 is smaller than the distance between the center line of the control component 32 and the axis of the second tube body 312. In this way, the distance between the control component 32 and the first tube body 311 is smaller, and the distance between the control component 32 and the second tube body 312 is farther. When the water heater 100 is working, the first tube body 311 is used to transport cold water, and the second tube body 312 is used to transport hot water. Through the above design, the control component 32 can be set away from the hot water pipe (that is, the second tube body 312), avoiding the heat radiated by the hot water pipe from damaging the control component 32. At the same time, the control component 32 is set closer to the cold water pipe (that is, the first tube body 311), which is conducive to the heat dissipation of the control component 32, thereby extending the service life of the control component 32.

[0076] Optionally, the distance between the axis of the first tube body 311 and the axis of the second tube body 312 is less than 100 mm. In this way, the influence of the length of the bypass tube body 313 and the assembly deformation on the bypass ratio and the bypass response speed can be reduced. Specifically, the distance between the first tube body 311 and the second tube body 312 is shorter, so that the length of the bypass tube body 313 is shortened, and the length of the bypass channel 303 can be shortened, so that the cold water in the first channel 301 can be quickly transported to the second channel 302 through the shorter bypass channel 303 to mix with the hot water in the second channel 302, thereby ensuring a faster bypass response speed and a more accurate bypass ratio. In addition, the shortened length of the bypass tube body 313 is conducive to improving the structural stability of the entire valve body 31, and avoiding the deformation of the bypass tube body 313 after long-term use, which has an adverse effect on the bypass ratio and the bypass response speed. The distance between the axis of the first tube body 311 and the axis of the second tube body 312 can be designed to be 90 mm, 80 mm, 70 mm, etc. according to needs.

[0077] In other embodiments, the control component 32 may also be disposed on the side of the bypass pipe body 313 facing the second side wall 12. That is, the control component 32 is located on the side of the bypass pipe body 313 away from the combustion heat exchange system 20, so that the control component 32 can be as far away from the heat radiation area of ​​the combustion heat exchange system 20 as possible to avoid the control component 32 being damaged by high temperature.

[0078] Please combine Figure 4 , Fig. 9 and Fig.10 In one embodiment, the combustion heat exchange system 20 includes a coilless heat exchanger, which includes a plurality of heat exchange tubes 234 and a heat exchange plate 235 sleeved on the periphery of the plurality of heat exchange tubes 234. The plurality of heat exchange tubes 234 are arranged along the thickness direction of the shell 10 to form a single-layer heat exchange tube structure. The plurality of heat exchange tubes 234 are connected in sequence to form a heat exchange flow channel. On the axial projection surface of the heat exchange tube 234, the minimum distance between any point on the heat exchange plate 235 and the outer tube wall of the heat exchange tube 234 is not greater than 3 mm.

[0079] Specifically, the combustion heat exchange system 20 includes a coilless heat exchanger, for example, the combustion heat exchange system 20 includes a primary heat exchanger 23 and a secondary heat exchanger 24, wherein at least one of the primary heat exchanger 23 and the secondary heat exchanger 24 adopts the above-mentioned coilless heat exchanger. Taking the primary heat exchanger 23 as an example, the primary heat exchanger 23 includes a plurality of heat exchange tubes 234, and a heat exchange plate 235 sleeved on the outer periphery of the plurality of heat exchange tubes 234, the plurality of heat exchange tubes 234 are arranged along the thickness direction of the shell 10 to form a single-layer heat exchange tube structure, and the plurality of heat exchange tubes 234 are connected in sequence to form a primary heat exchange flow channel; on the axial projection surface of the heat exchange tube 234, the minimum distance between any point on the heat exchange plate 235 and the outer tube wall of the heat exchange tube 234 is not greater than 3 mm. The specific structure of the primary heat exchanger 23 is described in detail below, and will not be repeated here.

[0080] It is understandable that there can be multiple heat exchange tubes 234, and there can be multiple heat exchange fins 235. Multiple heat exchange fins 235 are arranged side by side, and multiple heat exchange tubes 234 are arranged in sequence on each heat exchange fin 235. Multiple heat exchange tubes 234 are connected in sequence to form a primary heat exchange flow channel. The heat exchange fins 235 are sleeved outside the heat exchange tubes 234. The heat exchange fins 235 can be clamped with the heat exchange tubes 234, or welded and fixed, which is not limited here. In addition, the material of the heat exchange tubes 234 and the heat exchange fins 235 can be copper, of course, it can also be other materials. Compared with the heat exchanger with a multi-layer heat exchange tube 234 structure, the heat exchanger with a single-layer heat exchange tube structure is lower in height and occupies less height space, so that the height dimension of the whole water heater 100 is shorter; and the single-layer heat exchange tube 234 is directly in contact with the high-temperature flue gas. Compared with setting up a multi-layer heat exchange tube 234, the single-layer heat exchange tube 234 has fewer low-temperature zones, and there is no problem of temperature difference between the upper and lower layers of heat exchange tubes 234. When the burner 21 of the water heater 100 is working at a small load, the single-layer heat exchange tube 234 with fewer low-temperature zones is not easy to produce condensed water, thereby reducing the risk of condensed water corroding the water heater 100.

[0081] In addition, the heat exchanger of the traditional water heater generally adopts a heat exchanger with a coil, which needs to be wound around the outside of the combustion chamber box of the combustion heat exchange system, which will not only increase the overall thickness of the combustion-winding heat exchange system and increase the occupied space, but also increase the leakage points and increase the water resistance pressure by setting the coil. In this technical solution, the small flow valve 30 can realize the precise intelligent bypass function to control the bypass mixed water temperature, so there is no need to wind the coil around the outer periphery of the box 21 of the combustion heat exchange system 20, so a coil-free heat exchanger can be used, which can reduce the overall thickness of the combustion-winding heat exchange system 20, reduce the occupied space, and help to further reduce the volume of the water heater 100. At the same time, the need to set the coil can also reduce the leakage points and reduce the water resistance pressure; the above technical effects are not achievable by the traditional ordinary bypass pipe.

[0082] Further, the axial projection surface of the heat exchange tube 234 can be understood as: along the radial section of the heat exchange tube 234, on the radial section of the heat exchange tube 234, the minimum distance between any point of the heat exchange plate 235 on the section and the outer tube wall of the heat exchange tube 234 is less than or equal to 3 mm, so that the distance between any point on the heat exchange plate 235 and the heat exchange tube 234 is relatively close. When the water heater is working, the heat exchange plate 235 that absorbs the heat of the high-temperature flue gas will transfer the heat to the heat exchange tube 234. The distance between the heat exchange plate 235 and the heat exchange tube 234 is relatively close, which is beneficial to improve the heat exchange capacity of the heat exchange plate 235, and is also beneficial to reduce the volume of the heat exchange plate 235, improve the material utilization rate of the heat exchange plate 235, so that the temperature on the heat exchange plate 235 can be evenly distributed. Among them, the minimum distance between any point on the heat exchange plate 235 and the outer tube wall of the heat exchange tube 234 can be 3 mm, or 2.5 mm, or 2 mm, etc., which is not specifically limited here.

[0083] Based on the above embodiments, Figure 3 , Figure 4 and Figure 6 As shown, the combustion heat exchange system 20 includes a box body 21, a burner 22 and a primary heat exchanger 23, the burner 22 and the primary heat exchanger 23 are both arranged in the box body 21, the primary heat exchanger 23 is located above the burner 22, the area between the primary heat exchanger 23 and the burner 22 forms a combustion chamber 211, the primary heat exchanger 23 has the primary heat exchange flow channel, the primary heat exchanger 23 is provided with a first water inlet 231 and a first water outlet 232 on the side facing the second side wall 12, the primary heat exchange flow channel connects the first water inlet 231 and the first water outlet 232, the water outlet end of the first flow channel 301 (that is, the first tube body 311) is connected to the first water inlet 231 through the first connecting pipe 25, and the water inlet end of the second flow channel 302 (that is, the second tube body 312) is connected to the first water outlet 232 through the second connecting pipe 26.

[0084] Specifically, the box body 21 is used to form the main support structure of the burner 22 and the primary heat exchanger 23. The box body 21 is generally made of sheet metal with high structural strength. The burner 22 is arranged in the box body 21 near the bottom of the box body 21, and the bottom of the box body 21 is provided with an air inlet 212 connected to the fan 50. The primary heat exchanger 23 is arranged in the box body 21 near the top, and a combustion chamber 211 is formed between the burner 22 and the primary heat exchanger 23. The burner 22 fully burns the mixture of fuel gas and air in the combustion chamber 211 and generates high-temperature flue gas. The high-temperature flue gas is transported upward along the combustion chamber 211 and can then fully contact with the primary heat exchanger 23 for heat exchange. Fig. 9 and Fig.10As shown, the primary heat exchanger 23 may specifically include two end plates 233 that are opposite and spaced apart along the width direction of the shell 10, a heat exchange plate group disposed between the two end plates 233, and a plurality of heat exchange tubes 234 that are inserted through the heat exchange plate 235 group, and the plurality of heat exchange tubes 234 are connected end to end in sequence to form a primary heat exchange channel. Optionally, the two end plates 233 of the primary heat exchanger 23 may be used as a part of the side wall of the box body 21, wherein the end plate 233 close to the second side wall 12 is provided with a first water inlet 231 and a first water outlet 232, the water inlet end of the primary heat exchange channel is connected to the first water inlet 231, and the water outlet end of the primary heat exchange channel is connected to the first water outlet 232. The first water inlet 231 is connected to the water outlet end of the first channel 301 (i.e., the first tube body 311) through the first connecting pipe 25, and the first water outlet 232 is connected to the water inlet end of the second channel 302 (i.e., the second tube body 312) through the second connecting pipe 26. In this way, the cold water in the first flow channel 301 can be transported to the primary heat exchange flow channel via the first connecting pipe 25 and the first water inlet 231 , and the hot water in the primary heat exchange flow channel can be transported to the second flow channel 302 via the first water outlet 232 and the second connecting pipe 26 .

[0085] In this embodiment, the first water inlet 231 and the first water outlet 232 are both located on the side of the primary heat exchanger 23 facing the second side wall 12, which is conducive to centrally arranging the first connecting pipe 25 and the second connecting pipe 26 in the second accommodating area 102, so that the pipeline layout is more compact. Among them, the first connecting pipe 25 and the second connecting pipe 26 include but are not limited to straight pipes, curved pipes, or a combination of straight pipes and curved pipes. The lengths of the first connecting pipe 25 and the second connecting pipe 26 can be designed according to actual needs, so that the small flow valve 30 can be arranged as far away from the primary heat exchanger 23 as possible, thereby avoiding the heat radiated by the primary heat exchanger 23 from damaging the valve body 31 and the control component 32 of the small flow valve 30, which is conducive to extending the service life of the small flow valve 30.

[0086] like Figure 4 As shown, in one embodiment, the first connecting pipe 25 and the second connecting pipe 26 are both extended downward from the primary heat exchanger 23, and the small flow valve 30 is connected to the bottom ends of the first connecting pipe 25 and the second connecting pipe 26. In this way, the small flow valve 30 can be arranged as far away from the primary heat exchanger 23 as possible, so as to avoid the heat radiated by the primary heat exchanger 23 from damaging the small flow valve 30 and the control component 32 of the small flow valve 30.

[0087] Furthermore, the distance between the small flow valve 30 and the primary heat exchanger 23 is not less than 60 mm. Such a configuration can ensure that a sufficient distance is reserved between the small flow valve 30 and the primary heat exchanger 23, thereby preventing the valve body 31 and the control component 32 of the small flow valve 30 from being damaged by the heat radiation of the primary heat exchanger 23 for a long time, and prolonging the service life of the small flow valve 30. For example, the distance between the small flow valve 30 and the primary heat exchanger 23 can be 60 mm, 70 mm, 80 mm, 90 mm, 100 mm, and so on.

[0088] Furthermore, the small flow valve 30 and the burner 22 are staggered in the height direction of the housing 10. The small flow valve 30 can be as far away from the heat radiation area of ​​the burner 22 as possible, thereby extending the service life of the small flow valve 30. For example, the small flow valve 30 can be staggered above the burner 22, or the first connecting pipe 25 and the second connecting pipe 26 can be designed to be long enough to allow the small flow valve 30 to be staggered below the burner 22.

[0089] like Figure 6 As shown, in one embodiment, the first water inlet 231 and the first water outlet 232 are arranged at intervals along the thickness direction of the shell 10, and the first connecting pipe 25 and the second connecting pipe 26 are arranged at intervals along the thickness direction of the shell 10. For example, the shell 10 is in the front-to-back direction, the first water inlet 231 is arranged side by side at the rear side of the first water outlet 232, and the first connecting pipe 25 is arranged at the rear side of the second connecting pipe 26. In this way, the space in the thickness direction of the shell 10 can be fully utilized for pipeline arrangement, avoiding the pipeline from occupying too much space in the width direction of the shell 10, which is conducive to reducing the width dimension of the water heater 100.

[0090] like Figure 6 As shown, in one embodiment, the distance between the first water inlet 231 and the first water outlet 232 is greater than the length of the bypass pipe body 313. Specifically, the first connecting pipe 25 may include a first straight pipe section extending downward from the periphery of the first water inlet 231, an inclined pipe section extending obliquely from the bottom end of the first straight pipe section toward the side close to the first water outlet 232, and a second straight pipe section extending downward from the bottom end of the inclined pipe section, and the bottom end of the second straight pipe section is connected to the top end of the first pipe body 311. The second connecting pipe 26 extends downward from the periphery of the first water outlet 232, and the bottom end of the second connecting pipe 26 is connected to the top end of the second pipe body 312.

[0091] In this embodiment, the distance between the first water inlet 231 and the first water outlet 232 is as large as possible, which is conducive to extending the length of the primary heat exchange channel as much as possible within a limited space, so that the water in the primary heat exchange channel can be fully heat exchanged. The length of the bypass pipe body 313 is relatively small, so that the length of the bypass channel 303 is short, so that the cold water in the first channel 301 can be quickly transported to the second channel 302 through the short bypass channel 303 to mix with the hot water in the second channel 302, thereby ensuring a faster bypass response speed and a more accurate bypass ratio.

[0092] like Fig. 9 and Fig.10 As shown, in one embodiment, the primary heat exchanger 23 includes two end plates 233 that are opposite to and spaced apart from each other along the width direction of the shell 10, a heat exchange plate group disposed between the two end plates 233, and a plurality of heat exchange tubes 234 that pass through the heat exchange plate group. The plurality of heat exchange tubes 234 are connected end to end in sequence to form a primary heat exchange flow channel, and the plurality of heat exchange tubes 234 are arranged into a single row of heat exchange tube groups along the thickness direction (e.g., front-to-back direction) of the shell 10. Specifically, the heat exchange plate group includes a plurality of heat exchange plates 235 arranged between two end plates 233, and the plurality of heat exchange plates 235 are sleeved on the periphery of the heat exchange tube 234, that is, the plurality of heat exchange tubes 234 in this embodiment are single-layer tubes, and the single-layer finned tubes (that is, the single-layer heat exchange tubes 234 with heat exchange plates 235) are in direct contact with the high-temperature flue gas. Compared with the double-layer finned tubes (that is, the upper and lower layers of heat exchange tubes 234), the single-layer finned tubes have fewer low-temperature zones, and the single-layer finned tubes do not have the problem of temperature difference between the upper and lower layers. When the burner 22 of the water heater 100 is working at a small load, the single-layer finned tubes with fewer low-temperature zones are not easy to produce condensed water, thereby reducing the risk of condensed water corroding the water heater 100.

[0093] In addition, when the water heater 100 is working at a small load, the low-temperature area on the heat exchanger 235 is reduced, which is conducive to increasing the temperature of the heat exchanger 235 after heat exchange with the high-temperature flue gas, so as to ensure that the temperature of the entire heat exchanger 235 is high, and the situation of local low temperature on the heat exchanger 235 and the generation of condensed water is reduced, thereby reducing the risk of condensed water corroding the water heater 100. In other words, this solution makes the temperature distribution on the heat exchanger 235 more uniform, reduces the low-temperature area on the heat exchanger 235, and reduces the risk of condensed water generated by the primary heat exchanger 23 and corroding the water heater 100. It can be seen that the technical solution in this solution improves the heat exchange performance of the primary heat exchanger 23, reduces the risk of water in the primary heat exchanger 23 being too high when the water is stopped and scalds the user, and also reduces the risk of condensed water generated by the primary heat exchanger 23 and corroding the water heater 100.

[0094] like Fig.10As shown, in one embodiment, the plurality of heat exchange tubes 234 are at the same height on the heat exchange fins 235. Such arrangement allows the plurality of heat exchange tubes 234 to maintain a consistent distance from the burner 22, which helps ensure that the temperatures of the plurality of heat exchange tubes 234 when in contact with the high-temperature flue gas are substantially the same, and avoids the situation where a large temperature difference on the plurality of heat exchange tubes 234 arranged in a single row easily generates condensed water, thereby helping to increase the service life of the primary heat exchanger 23.

[0095] like Fig.10 and Fig.11 As shown, in one embodiment, a plurality of mounting holes 2351 are provided on the heat exchange plate 235 , and the plurality of mounting holes 2351 are arranged in a single row and are arranged in sequence and spaced apart along the length direction of the heat exchange plate 235 , and the plurality of heat exchange tubes 234 are correspondingly passed through the plurality of mounting holes 2351 of each of the heat exchange plates 235 . It can be understood that the multiple mounting holes 2351 on the heat exchange plate 235 are arranged in a single row and arranged in sequence at intervals, so that the multiple heat exchange tubes 234 are also arranged in a single row after correspondingly passing through the multiple mounting holes 2351 on the heat exchange plate 235. The temperature difference of the multiple heat exchange tubes 234 arranged in a single row after contacting with the high-temperature flue gas is smaller. Compared with the double-row heat exchange tubes 234, the high-temperature flue gas first passes through the lower heat exchange tubes 234 and then passes through the upper heat exchange tubes 234. There is a temperature difference between the upper heat exchange tubes 234 and the lower heat exchange tubes 234, which makes it easy for the double-row heat exchange tubes 234 to generate condensed water. The multiple mounting holes 2351 of the present solution are arranged in a single row, so that the multiple heat exchange tubes 234 are arranged in a single row, ensuring that the temperature on the multiple heat exchange tubes 234 remains consistent, reducing the risk of the multiple heat exchange tubes 234 generating condensed water and corroding the water heater 100, and improving the reliability of the first-level heat exchanger 23.

[0096] In one embodiment, the plurality of mounting holes 2351 are all elliptical holes; it can be understood that the plurality of mounting holes 2351 are all elliptical holes, so that the corresponding heat exchange tubes 234 passing through the plurality of mounting holes 2351 are also elliptical tubes, and the elliptical heat exchange tubes 234 are more conducive to the high-temperature flue gas flowing to the back side of the heat exchange tubes 234 for heat exchange, and the heat exchange area per unit volume of the elliptical tubes is larger, which is beneficial to improving the heat exchange efficiency of the primary heat exchanger 23.

[0097] like Fig.11 As shown, in one embodiment, a baffle bar 2352 is provided at the upper edge of the heat exchange plate 235 , the middle portion of the baffle bar 2352 is recessed downward to be arranged in an arc shape, and the baffle bar 2352 is located between any two adjacent mounting holes 2351 .

[0098] It can be understood that the baffle strip 2352 is located between any two adjacent mounting holes 2351, and the middle part of the baffle strip 2352 is concave downward, so that a guide channel is formed between the baffle strip 2352 and the heat exchange tube 234 in the adjacent mounting hole 2351, and the guide channel can gather the high-temperature flue gas to flow in the upper half of the heat exchange tube 234, that is, to gather the high-temperature flue gas to flow on the back of the heat exchange tube 234; and it can also block the high-temperature flue gas from flowing directly upward, delay the separation of the high-temperature flue gas and the heat exchange tube 234, increase the heat exchange intensity and reduce heat loss, so as to improve the heat exchange efficiency. In this embodiment, the curvature of the guide strip is consistent with the curvature of the heat exchange tube 234 in the adjacent mounting hole 2351, which is conducive to guiding the high-temperature flue gas to the back of the heat exchange tube 234 for heat exchange.

[0099] like Fig.11 As shown, in one embodiment, a guide hole 2353 is provided between any two adjacent mounting holes 2351 , and a guide edge 2354 is provided in a ring shape on the outer periphery of the guide hole 2353 , and the guide edge 2354 is located directly below the baffle strip 2352 .

[0100] It can be understood that the heat is more concentrated below the baffle strip 2352. By providing the guide hole 2353 directly below the baffle strip 2352, local overheating of the position directly below the baffle strip 2352 is avoided, which is beneficial to improving the uniformity of temperature distribution on the heat exchange plate 235; and, the outer periphery of the guide hole 2353 is provided with a guide edge 2354 arranged in a ring shape, and the guide edge 2354 guides the gathered high-temperature flue gas to the periphery of the heat exchange tube 234. The provision of the guide edge 2354 is beneficial to increasing the heat exchange area and the heat exchange efficiency.

[0101] In order to reduce the vaporization noise of the heat exchange tube 234, as Fig.10 and Fig.12 As shown in one embodiment, at least one of the heat exchange tubes 234 is provided with a spoiler 236 for disturbing the water flow, and the spoiler 236 includes a spoiler body 2361 and two support parts 2362, the top ends of the two support parts 2362 are connected to the spoiler body 2361, and the bottom ends of the two support parts 2362 are spaced apart and respectively supported on the inner wall of the heat exchange tube 234.

[0102] It is understandable that a spoiler 236 may be provided in each heat exchange tube 234. Of course, the spoiler 236 may also be provided in only one or part of the heat exchange tubes 234 as required, and the specific details are not limited here. In this embodiment, a spoiler 236 may be provided in each heat exchange tube 234, and the spoiler 236 can extend the flow path of the water flow in the heat exchange tube 234, enhance the spoiler effect, increase the contact time between the high-temperature flue gas and the water, and make the heat exchange between the high-temperature flue gas and the water more sufficient.

[0103] Furthermore, if Fig.12 As shown, the spoiler 236 includes a spoiler body 2361 and two supporting parts 2362. The spoiler body 2361 is connected to the top ends of the two supporting parts 2362, so that the spoiler 236 is roughly arranged in a "human" shape. The bottom ends of the two supporting parts 2362 are arranged at intervals and are respectively supported on the inner wall surface of the fire-facing end of the heat exchange tube 234. The two supporting parts 2362 increase the contact area with the inner wall surface of the fire-facing end of the heat exchange tube 234, destroy the flow boundary layer of the inner wall surface of the fire-facing end of the heat exchange tube 234, thereby increasing the contact time between the high-temperature flue gas and water, which is beneficial to increasing the temperature of the water flow in the heat exchange tube 234, that is, strengthening the inner side heat transfer of the fire-facing end of the heat exchange tube 234, thereby reducing the noise generated by the local overheating vaporization of the fire-facing end of the heat exchange tube 234. It can be seen that this solution increases the turbulence effect on water by setting the spoiler 236, destroys the flow boundary layer of the inner wall surface of the fire-facing end of the heat exchange tube 234, makes the heat exchange between the water flow and the high-temperature flue gas more complete, thereby reducing the vaporization noise of the heat exchange tube 234.

[0104] Further, one of the two supporting parts 2362 includes a plurality of first supporting feet, and the other supporting part 2362 includes a plurality of second supporting feet, and the plurality of first supporting feet and the plurality of second supporting feet are alternately arranged in sequence along the length direction of the spoiler 236, and the plurality of first supporting feet are tilted toward one side of the spoiler body 2361, and the plurality of second supporting feet are tilted toward the other side of the spoiler body 2361. Such a configuration enables the plurality of first supporting feet and the plurality of second supporting feet to be stably supported on the inner wall of the heat exchange tube 234, and can also enhance the spoiler effect.

[0105] In one embodiment, the first support leg and the second support leg form an angle on the axial projection surface of the heat exchange tube 234, and the angle is an acute angle. Such an arrangement makes the distance between the bottom end of the first support leg and the bottom end of the second support leg closer, and the distance to the bottom end of the fire-facing end of the heat exchange tube 234 is closer, which is conducive to destroying the flow boundary layer of the inner wall surface of the fire-facing end of the heat exchange tube 234, thereby strengthening the heat transfer inside the fire-facing end of the heat exchange tube 234, and achieving the effect of reducing the noise generated by the local overheating vaporization of the fire-facing end of the heat exchange tube 234.

[0106] Of course, in other embodiments, on the axial projection surface of the heat exchange tube 234, the first supporting foot and the second supporting foot form an angle, and the angle is a right angle or an obtuse angle, which is not specifically limited here.

[0107] See also Fig.12In one embodiment, the spoiler body 2361 is provided with a plurality of spoiler holes 23611, and the plurality of spoiler holes 23611 are arranged at intervals along the length direction of the heat exchange tube 234, and the spoiler 236 has a water-facing end; each spoiler hole 23611 is provided with a spoiler 23612 inclined outwardly at an edge away from the water-facing end, and two adjacent spoilers 23612 are located on both sides of the spoiler body 2361;

[0108] And / or, a spoiler ridge 23613 extending toward the water-facing end is provided on the hole wall of at least one of the spoiler holes 23611.

[0109] It can be understood that each spoiler hole 23611 is provided with a spoiler 23612 inclined outwardly, and each spoiler 23612 is provided at the edge of the spoiler hole 23611 away from the water-facing end, which can enhance the spoiler effect and prevent water from scaling in the heat exchange tube 234. Two adjacent spoilers 23612 are located on both sides of the spoiler body 2361, which can further enhance the spoiler effect.

[0110] In addition, a spoiler rib 23613 is provided in the spoiler hole 23611, and the spoiler rib 23613 extends toward the water-facing end of the spoiler 236. When the water flows through the spoiler hole 23611, the spoiler rib 23613 blocks the water flow to extend the flow path of the water flow in the heat exchange tube 234, further enhancing the spoiler effect, thereby further reducing the vaporization noise of the heat exchange tube 234.

[0111] In one embodiment, spoiler ridges 23613 are provided on the top wall and / or the bottom wall of the spoiler hole 23611. With such a configuration, when water passes through the spoiler hole 23611, the spoiler ridges 23613 provided on the top wall of the spoiler hole 23611 and / or the spoiler ridges 23613 provided on the bottom wall of the spoiler hole 23611 increase the spoiler effect of the spoiler 236, thereby making the heat exchange between the water flow and the high-temperature flue gas more complete, and further reducing the vaporization noise of the heat exchange tube 234.

[0112] In one embodiment, the heat exchange tube 234 is an elliptical tube. It is understandable that the heat exchange tube 234 is an elliptical tube, and compared with the conventional circular heat exchange tube, the elliptical heat exchange tube 234 is more conducive to the high-temperature flue gas flowing to the back of the heat exchange tube 234 for heat exchange, and the heat exchange area per unit volume of the elliptical tube is larger than that of the circular tube, thereby effectively improving the heat exchange efficiency of the primary heat exchanger 23.

[0113] Please refer to Figures 2 to 5In one embodiment, the combustion heat exchange system 20 also includes a secondary heat exchanger 24, the secondary heat exchanger 24 has a secondary heat exchange flow channel, the secondary heat exchanger 24 is arranged at the top of the box body 21, and the top of the box body 21 is provided with a smoke outlet connected to the secondary heat exchanger 24, and the secondary heat exchanger 24 is provided with a second water inlet 241 and a second water outlet 242 at a position close to the second accommodating area 102, and the secondary heat exchange flow channel connects the second water inlet 241 and the second water outlet 242, the second water inlet 241 is connected to the water inlet pipe 81, and the second water outlet 242 is connected to the water inlet end of the first flow channel 301 (that is, the first tube body 311) through the third connecting pipe 27.

[0114] In this embodiment, the high-temperature flue gas generated by the burner 22 flows upward to exchange heat with the primary heat exchanger 23, and then continues to flow upward to the secondary heat exchanger 24, using the latent heat of the flue gas to exchange heat with the secondary heat exchanger 24, so as to heat the water in the secondary heat exchange flow channel. In this way, full utilization of thermal energy can be achieved and thermal efficiency can be improved. A smoke exhaust pipe 17 passing through the shell 10 is also provided at the top of the secondary heat exchanger 24, and the smoke after the secondary heat exchange can finally be discharged through the smoke exhaust pipe 17. When the water heater 100 is working, the cold water in the external pipe system can be transported to the secondary heat exchange channel through the water inlet pipe 81 and the second water inlet 241 for preheating. The preheated water is transported to the first tube body 311 of the small flow valve 30 through the second water outlet 242 and the third connecting pipe 27, and then transported to the primary heat exchange channel through the first tube body 311 and the first water inlet 231 for heating. The heated water is transported to the first tube body 311 through the first water outlet 232 and the second connecting pipe 26, and finally transported to the user's water end by the water outlet pipe 82. In order to facilitate the connection between the third connecting pipe 27 and the first tube body 311, the third connecting pipe 27 optionally includes a main pipe section extending downward from the periphery of the second water outlet 242, and a bend section that is transversely bent from the lower end of the main pipe section and extends upward, and the top of the bend section is connected to the water inlet end of the first tube body 311.

[0115] Optionally, the side of the secondary heat exchanger 24 close to the second side wall 12 extends out of the side of the box body 21, and the second water inlet 241 and the second water outlet 242 are provided at the bottom of the side of the secondary heat exchanger 24 close to the second side wall 12.

[0116] In this embodiment, in the width direction of the shell 10, the side of the secondary heat exchanger 24 close to the second side wall 12 (for example, the right side of the secondary heat exchanger 24) extends out of the side of the box body 21, that is, the secondary heat exchanger 24 and the box body 21 are partially staggered in the width direction of the shell 10, so that it is convenient to open the second water inlet 241 and the second water outlet 242 at the bottom side of the portion of the secondary heat exchanger 24 extending out of the box body 21, and at the same time, the second accommodating area 102 is formed below the portion of the secondary heat exchanger 24 extending out of the box body 21, and the small flow valve 30 is located in the second accommodating area 102 below the second water inlet 241 and the second water outlet 242, so that it is convenient to connect the second water outlet 242 with the small flow valve 30 through the third connecting pipe 27. The water inlet pipe 81 extends downward from the periphery of the second water inlet 241 to the bottom near the shell 10, so as to be connected with the water inlet module 70 provided at the bottom of the shell 10. The above structural design is conducive to concentrating the water inlet pipe 81 and the third connecting pipe 27 in the second accommodating area 102, further improving the compactness of the pipeline arrangement, and facilitating miniaturization of the water heater 100.

[0117] like Figure 2 and Figure 5 As shown, in one embodiment, the water heater 100 also includes a condensate collecting device 90 disposed in the shell 10, and the condensate collecting device 90 is located below the secondary heat exchanger 24 and on the same side as the small flow valve 30. The secondary heat exchanger 24 is also provided with a condensate outlet 243 at the bottom position on the side close to the second side wall 12, and the condensate outlet 243 is connected to the condensate collecting device 90 through a drain pipe 83.

[0118] In this embodiment, the condensate collecting device 90 may be arranged in the fourth accommodation area 104, for example, the condensate collecting device 90 is arranged side by side on the side of the water inlet module 70 close to the second side wall 12. Optionally, the maximum contour surface of the condensate collecting device 90 faces the side in the width direction of the shell 10, which can avoid the condensate collecting device 90 from occupying too much space in the width direction of the shell 10, thereby facilitating further reducing the width dimension of the water heater 100. It can be understood that since the flue gas after combustion contains acidic substances, the condensate generated in the secondary heat exchanger 24 is generally acidic. The condensate generated in the secondary heat exchanger 24 can be transported to the condensate collecting device 90 through the condensate outlet and the drain pipe 83 for collection, so as to avoid the acidic condensate from gathering in the secondary heat exchanger 24 and corroding the secondary heat exchanger 24. Optionally, a neutralizer (such as alkaline particles) for neutralizing the condensate is provided in the condensate collecting device 90, so that the acidic condensate can be neutralized into neutral after entering the condensate collecting device 90, thereby meeting the discharge requirements. The condensate collection device 90 is located below the secondary heat exchanger 24 and on the same side as the small flow valve 30. This can make full use of the space on the same side of the shell 10. Without increasing the width of the shell 10, the water heater 100 can be integrated with a small flow valve 30 with an actively controlled bypass line and a condensate collection device 90 with a condensate collection function in a limited space. This allows the water heater 100 to be miniaturized while also achieving diversified functions.

[0119] Optionally, the second water inlet 241, the second water outlet 242 and the condensate outlet 243 of the secondary heat exchanger 24 are arranged side by side on the bottom side of the secondary heat exchanger 24 along the thickness direction of the shell 10. This can facilitate the arrangement of multiple pipelines (such as the water inlet pipe 81, the third connecting pipe 27, and the drain pipe 83) from the bottom side of the secondary heat exchanger 24 downward, and enable the multiple pipelines to be concentrated in the second accommodating area 102, thereby further improving the compactness of the pipeline arrangement and making further full use of the space in the second accommodating area 102.

[0120] The above description is only a preferred embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the inventive concept of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A water heater, characterized in that: include: A housing having a first side wall and a second side wall that are opposite to each other and spaced apart in a width direction, and a first accommodating area between the first side wall and the second side wall; a combustion heat exchange system, which is arranged in the first accommodating area, one side of the combustion heat exchange system is arranged close to the first side wall, a second accommodating area is formed between the other side of the combustion heat exchange system and the second side wall, and the combustion heat exchange system has at least one primary heat exchange flow channel; and A small flow valve is arranged in the second accommodating area, and the small flow valve includes a valve body and a control component arranged on the valve body. The valve body has a first flow channel connected to the water inlet end of the first-level heat exchange flow channel, a second flow channel connected to the water outlet end of the first-level heat exchange flow channel, and a bypass flow channel connecting the first flow channel with the second flow channel. The control component is used to control the water flow rate of the bypass flow channel.

2. The water heater according to claim 1, characterized in that The water heater further comprises an electric control module disposed in the second accommodation area, the small flow valve and the electric control module are both located on the same side of the combustion heat exchange system, and the combustion heat exchange system and the small flow valve are electrically connected to the electric control module respectively; And / or, a heat insulating member is provided on a side of the second accommodating area close to the combustion heat exchange system; And / or, a side of the combustion heat exchange system close to the first side wall is arranged directly opposite to the first side wall.

3. The water heater according to claim 1, characterized in that: The shell further includes a back plate connected between the first side wall and the second side wall. The valve body is provided with a connecting portion, and the connecting portion is connected and fixed to the back plate.

4. The water heater according to claim 1, characterized in that: The bypass ratio of the small flow valve ranges from 40% to 70%, and the bypass ratio is the ratio of the water flow entering the bypass channel through the first channel to the water flow entering the primary heat exchange channel through the first channel.

5. The water heater according to claim 1, characterized in that: The shell also includes a bottom wall, and the two sides of the bottom wall are respectively connected to the bottom side of the first side wall and the bottom side of the second side wall. A third accommodating area is formed between the bottom side of the combustion heat exchange system and the bottom wall. The water heater also includes a fan arranged in the third accommodating area, and the fan is connected to the burner of the combustion heat exchange system. The fan is used to blow air into the burner.

6. The water heater according to claim 5, characterized in that The water heater also includes an air intake module arranged in the third accommodating area, the fan and the air intake module are arranged side by side along the width direction of the shell, the bottom wall is provided with an air intake joint connected to the air intake end of the air intake module, the air outlet end of the air intake module is connected to the burner, and the air intake module is used to transport combustion gas to the burner.

7. The water heater according to claim 5, characterized in that A fourth accommodating area is also provided in the shell, and the fourth accommodating area is located below the second accommodating area, and the fourth accommodating area is located on a side of the third accommodating area close to the second side wall, and the fourth accommodating area connects the second accommodating area with the third accommodating area. The water heater also includes a water inlet module provided in the fourth accommodating area, and the bottom wall is provided with a water inlet joint connected to the water inlet end of the water inlet module, and the water outlet end of the water inlet module is connected to the water inlet end of the first flow channel.

8. The water heater according to claim 7, characterized in that The water heater also includes a water outlet pipe connected to the water outlet end of the second flow channel, the water outlet pipe includes a first pipe section extending downward from the valve body, and a second pipe section bent from the bottom end of the first pipe section toward the first side wall and extending downward at an angle, the first pipe section is located in the second accommodating area, the second pipe section extends through the fourth accommodating area to the third accommodating area, and the bottom wall is provided with a water outlet joint connected to the water outlet end of the second pipe section.

9. The water heater according to claim 1, characterized in that: The valve body comprises a first tube body, a second tube body and a bypass tube body, the first tube body and the second tube body are arranged in parallel along the height direction of the shell, the bypass tube body is connected between the first tube body and the second tube body, the first tube body constructs the first flow channel, the second tube body constructs the second flow channel, the bypass tube body constructs the bypass flow channel, the control component is arranged on the bypass tube body, and the control component is a solenoid valve or a proportional valve; And / or, the combustion heat exchange system includes a coilless heat exchanger, which includes a plurality of heat exchange tubes and heat exchange fins sleeved on the periphery of the plurality of heat exchange tubes, the plurality of heat exchange tubes are arranged along the thickness direction of the shell to form a single-layer heat exchange tube structure, and the plurality of heat exchange tubes are connected in sequence to form a heat exchange flow channel; on the axial projection surface of the heat exchange tube, the minimum distance between any point on the heat exchange fin and the outer tube wall of the heat exchange tube is not greater than 3 mm.

10. The water heater according to any one of claims 1 to 9, characterized in that: The combustion and heat exchange system includes a box body, a burner and a primary heat exchanger, the burner and the primary heat exchanger are both arranged in the box body, the primary heat exchanger is located above the burner, and the area between the primary heat exchanger and the burner forms a combustion chamber, the primary heat exchanger has the primary heat exchange channel, the primary heat exchanger is provided with a first water inlet and a first water outlet on the side facing the second side wall, the primary heat exchange channel connects the first water inlet and the first water outlet, the water outlet end of the first channel is connected to the first water inlet through a first connecting pipe, and the water inlet end of the second channel is connected to the first water outlet through a second connecting pipe.

11. The water heater according to claim 10, characterized in that The first connecting pipe and the second connecting pipe are both extended downward from the first-stage heat exchanger, and the small flow valve is connected to the bottom ends of the first connecting pipe and the second connecting pipe; the distance between the small flow valve and the first-stage heat exchanger is not less than 60 mm; and / or the small flow valve and the burner are staggered in the height direction of the shell.

12. The water heater according to claim 10, characterized in that The combustion heat exchange system also includes a secondary heat exchanger, which has a secondary heat exchange flow channel. The secondary heat exchanger is arranged at the top of the box body, and the top of the box body is provided with a smoke outlet connected to the secondary heat exchanger. The secondary heat exchanger is provided with a second water inlet and a second water outlet at a position close to the second accommodating area. The secondary heat exchange flow channel connects the second water inlet and the second water outlet. The second water inlet is connected to a water inlet pipe, and the second water outlet is connected to the water inlet end of the first flow channel through a third connecting pipe.

13. The water heater according to claim 12, characterized in that The water heater also includes a condensate collecting device arranged in the shell, the condensate collecting device is located below the secondary heat exchanger and on the same side as the small flow valve, and the secondary heat exchanger is also provided with a condensate outlet at a position close to the second accommodating area, and the condensate outlet is connected to the condensate collecting device through a drain pipe.

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