Water heater

Abstract

The utility model discloses a water heater, and relates to the technical field of water heaters, the water heater comprises a shell, an expansion water tank and a combustion heat exchange main body, the shell comprises a back plate; the expansion water tank is arranged on the back plate; the combustion heat exchange body is arranged in the shell and located on the side, away from the back plate, of the expansion water tank. According to the technical scheme, the expansion water tank is arranged on the back plate, and the combustion heat exchange body is arranged on the side, away from the back plate, of the expansion water tank, so that compared with the mode that the expansion water tank is arranged on the top of the combustor, the length of the water heater in the height direction is reduced, and the building area occupied by the installation position of the water heater is reduced; therefore, the installation flexibility of the water heater is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of water heaters, in particular to a water heater. Background Art

[0002] In a gas water heater, an expansion tank is used to accommodate and compensate for the expansion of water in the system. When the water in the water heater expands due to heat, the expansion tank can help stabilize the water pressure in the system to prevent the water heater from being damaged or leaking due to excessive water pressure. However, in the related prior art, the expansion tank is arranged on the top of the burner. The water heater obtained by this layout scheme has a large overall size, and its installation location occupies a large building area, which makes the installation flexibility low. Utility Model Content

[0003] The main purpose of the utility model is to provide a water heater, aiming to reduce the building area occupied by the installation position of the water heater, so as to improve the installation flexibility of the water heater.

[0004] In order to achieve the above-mentioned purpose, the utility model provides a water heater, which comprises:

[0005] A housing, the housing comprising a back plate;

[0006] an expansion water tank, disposed on the back plate; and

[0007] The combustion and heat exchange body is arranged in the shell and is located at a side of the expansion water tank away from the back plate.

[0008] In one embodiment, the combustion heat exchange body includes a burner and a fan, the air outlet side of the fan is connected to the air inlet of the burner, and the fan is arranged below the burner.

[0009] In one embodiment, the water heater includes an electric control box, and the electric control box is arranged below the combustion heat exchange body.

[0010] In one embodiment, the combustion heat exchange body has a combustion chamber, and the distance between the electric control box and the combustion chamber is greater than 20 mm.

[0011] In one embodiment, the electric control box is disposed on a side of the fan away from the combustion chamber.

[0012] In one embodiment, the water heater further comprises a control valve assembly, wherein the control valve assembly is disposed below the combustion and heat exchange body, and the electric control box is disposed on the control valve assembly.

[0013] In one embodiment, the electric control box is located on a side of the control valve assembly close to the back plate.

[0014] In one embodiment, an air intake channel is formed between the air outlet side of the fan and the air inlet of the burner; the water heater includes a first air distribution plate and a second air distribution plate, the first air distribution plate and the second air distribution plate are arranged along the flow direction of the air intake channel, and the first air distribution plate and the second air distribution plate are both used to adjust the flow area of ​​the air intake channel.

[0015] In one embodiment, the water heater includes a waste heat recovery device, and the waste heat recovery device is arranged above the combustion heat exchange body and the expansion water tank.

[0016] In one embodiment, the expansion water tank is arranged in a square shape.

[0017] The technical solution of the utility model reduces the length of the water heater in the height direction and the building area occupied by the water heater installation position by arranging the expansion water tank on the back plate and arranging the combustion heat exchange body on the side of the expansion water tank away from the back plate, compared with arranging the expansion water tank on the top of the burner, thereby improving the installation flexibility of the water heater. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the utility model 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 utility model. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0019] Figure 1 A schematic structural diagram of an embodiment of a water heater provided by the utility model;

[0020] Figure 2 for Figure 1 Cross-sectional view in one direction.

[0021] Description of Figure Numbers:

[0022] 10. Water heater;

[0023] 100, housing; 110, back plate; 120, end plate;

[0024] 200. Expansion water tank;

[0025] 300, combustion heat exchange body; 301, combustion chamber; 310, burner; 320, fan; 330, main heat exchanger;

[0026] 400, electric control box;

[0027] 500, control valve assembly;

[0028] 600. Waste heat recovery device.

[0029] The realization of the purpose, functional features and advantages of the utility model will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0030] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0031] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back...), 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 indications will also change accordingly.

[0032] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the utility model, 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 utility model.

[0033] The utility model provides a water heater, which aims to reduce the building area occupied by the installation location of the water heater, so as to improve the installation flexibility of the water heater. Figures 1 to 2 , solid arrows indicate spaces, slots, or holes.

[0034] In one embodiment of the present invention, please refer to Figure 1 and Figure 2The water heater 10 includes a shell 100, an expansion water tank 200 and a combustion heat exchange body 300. The shell 100 includes a back plate 110; the expansion water tank 200 is arranged on the back plate 110; the combustion heat exchange body 300 is arranged in the shell 100 and is located on the side of the expansion water tank 200 away from the back plate 110.

[0035] The technical solution of the present invention reduces the length of the water heater 10 in the height direction and the building area occupied by the installation position of the water heater 10, thereby improving the installation flexibility of the water heater 10, compared with arranging the expansion water tank 200 on the top of the burner 310, by arranging the expansion water tank 200 on the back plate 110 and arranging the combustion heat exchange body 300 on the side of the expansion water tank 200 away from the back plate 110.

[0036] Regarding the building area occupied by the installation location of the water heater 10, taking the installation of the water heater 10 on the indoor wall as an example, the building area occupied by the installation location of the water heater 10 refers to the area of ​​the indoor wall occupied by the water heater 10 after the water heater 10 is installed on the indoor wall.

[0037] In the embodiment of the present utility model, the water heater 10 generally refers to a gas water heater 10 , and the specific structure of the water heater 10 will be described below.

[0038] The water heater 10 generally includes a housing 100, a burner 310, a main heat exchanger 330, an ignition device, an electric control box 400, a control valve assembly 500, an expansion tank 200, etc. The burner 310, the main heat exchanger 330, the ignition device, the electric control box 400, the control valve assembly 500, and the expansion tank 200 are generally arranged in the housing 100. The burner 310 is one of the core components of the gas water heater 10, which is responsible for mixing gas with air and burning it to generate heat; the main heat exchanger 330 is used to transfer the heat generated by the burner 310 to the water flowing through it; the ignition device is used to ignite the gas in the burner 310, which can be spark ignition or thermocouple ignition; the electric control box 400 is used to manage and control various electronic and electrical functions. The electric control box 400 generally contains multiple circuit boards, sensor interfaces, control software and other electronic components, which are responsible for coordinating various operations of the water heater 10. The housing 100 , the control valve assembly 500 and the expansion water tank 200 will be described in detail below.

[0039] Regarding the shell 100, the shell 100 of the water heater 10 generally includes a bottom shell and a cover, and the bottom shell and the cover are detachably connected. The bottom shell generally includes a back plate 110 and end plates 120 disposed at the upper and lower ends of the back plate 110. This structure provides a solid frame for the water heater 10, increases the stability and durability of the overall structure, and the end plates 120 are disposed at the upper and lower ends of the back plate 110, and can also better disperse and bear the weight of the internal components, reducing the deformation or damage of the bottom shell; in addition, the end plates 120 can be used as mounting points to facilitate the fixing and mounting of components inside the water heater 10, such as the burner 310, the heat exchanger, etc. Of course, in some embodiments, the bottom shell may only include the back plate 110, or the bottom shell includes one of the back plate 110, the upper end plate 120 and the lower end plate 120. Taking the installation of the water heater 10 on the indoor wall as an example, the back plate 110 is the side close to the wall when it is installed on the wall.

[0040] Regarding the expansion water tank 200, the expansion water tank 200 plays a buffering and regulating role, ensuring that the water system of the water heater 10 can operate stably under various working conditions, while protecting other equipment in the water heater 10 from being affected by pressure fluctuations in the water system.

[0041] The main structure of the expansion water tank 200 includes a box body, an air bag or a rubber membrane, a pressure valve or a safety valve, an exhaust valve, etc. The box body is the outer shell of the expansion water tank 200, and the box body is provided with a water inlet or a water outlet, which is used to connect and communicate with the water system of the water heater 10. The air bag or the rubber membrane is arranged inside the box body, and there is usually one air bag or a rubber membrane, which divides the inside of the water tank into an air chamber and a water chamber. The air bag is usually pre-filled with compressed gas to maintain the system pressure. The air chamber is located on one side of the air bag or the rubber membrane, and is usually filled with compressed air or other inert gases, such as nitrogen, to provide pressure balance; the water chamber is located on the other side of the air bag or the rubber membrane, and the water chamber is connected to the water inlet to accommodate the water expanded due to the heating of the system. The existence of the air chamber allows the water in the water chamber to enter when it is heated and expanded, thereby avoiding excessive system pressure. When the system cools down and the water volume shrinks, the gas in the air chamber expands, pushing the water in the water chamber back to the system. The pressure valve or safety valve is used to control the pressure in the air cavity to prevent the water tank from rupturing due to excessive pressure; the exhaust valve is used to discharge the gas in the air cavity to adjust the pressure or discharge the gas during maintenance.

[0042] The expansion water tank 200 is connected to the water system of the water heater 10 through a bypass pipeline. This bypass pipeline is connected to the cold water inlet pipeline or the hot water outlet pipeline, and it is usually more preferred to be connected to the hot water outlet pipeline; the bypass pipeline can be connected to the hot water outlet pipeline or the cold water inlet pipeline through a three-way valve, so that the direction of water flow can be controlled as needed. The diameter of the bypass pipeline is designed to be smaller than the diameter of the hot water outlet pipeline or the cold water inlet pipeline to ensure that the expanded water can flow smoothly into the expansion water tank 200. Usually, a one-way valve (also called a check valve or a check valve) is also installed on the bypass pipeline so that water can only flow from the system to the expansion water tank 200, preventing the water in the expansion water tank 200 from flowing back into the water system when the pressure drops.

[0043] The control valve assembly 500 refers to a group of valves specifically used to control a specific fluid (such as gas or water), which can work independently or in coordination. The functions and structures of the control valve group may be quite diverse, including but not limited to: an air inlet valve (controlling the entry of gas), a gas proportional valve (adjusting the flow and pressure of gas), and a water inlet valve (controlling the entry of cold water).

[0044] In one embodiment, the combustion heat exchange body 300 includes a burner 310 and a fan 320. In order to further reduce the building area occupied by the installation location of the water heater 10, the air outlet side of the fan 320 is connected to the air inlet of the burner 310, and the fan 320 is arranged below the burner 310. In this way, by placing the fan 320 below the burner 310, it can be placed between the valves of the control valve assembly 500, so that the gap between the valves in the control valve assembly 500 at the lower end of the burner 310 can be more fully utilized, thereby further reducing the building area occupied by the installation location of the water heater 10. In addition, by connecting the air outlet side of the fan 320 with the air inlet of the burner 310, the gas ratio can be adjusted more accurately and more fully mixed combustion can be achieved. In this way, relative to the same target heating amount, a smaller fan 320 and burner 310 can be used, thereby further reducing the size of the water heater 10.

[0045] Exemplarily, through experiments, a single-row burner 310 can achieve a power of 0.6-2.8 kW / piece. Taking 28 kW as an example, for the same length, a forced-exhaust water heater 10 (the air inlet side of the fan 320 is connected to the air outlet of the burner 310) requires 12-14 combustion fire row pieces, while a forced-drum water heater 10 (the air outlet side of the fan 320 is connected to the air inlet of the burner 310) only requires 11-13 pieces.

[0046] In another embodiment, in order to further improve the adjustment of gas ratio and realize more complete mixed combustion, an air intake channel is formed between the air outlet side of the fan 320 and the air inlet of the burner 310, and the water heater 10 includes a first air distribution plate and a second air distribution plate, and the first air distribution plate and the second air distribution plate are arranged along the flow direction of the air intake channel, and the first air distribution plate and the second air distribution plate are used to adjust the flow area of ​​the air intake channel.

[0047] In another embodiment, the water heater 10 includes an electric control box 400 . In order to make full use of the gaps between the valves at the lower end of the burner 310 , the electric control box 400 is disposed below the combustion and heat exchange body 300 .

[0048] In one embodiment, the combustion heat exchange body 300 has a combustion chamber 301. In order to ensure that the electric control box 400 is not affected by the temperature of the combustion chamber, the distance between the electric control box 400 and the combustion chamber 301 is greater than 20 mm. Specifically, it can be 21 mm, 22 mm, 23 mm, 24 mm, 25 mm, 26 mm, 27 mm, 28 mm, 30 mm, 40 mm or more.

[0049] In a preferred embodiment, the electric control box 400 is disposed on a side of the fan 320 away from the combustion chamber 301. In this embodiment, by disposing the electric control box 400 on a side of the fan 320 away from the combustion chamber 301, firstly, when the fan 320 is working, it can take away the heat emitted by the electric control box 400, thereby accelerating the cooling of the electric control box 400.

[0050] In one embodiment, in order to better utilize the space below the burner 310, the internal structure of the water heater 10 is optimized and made more compact. The water heater 10 further includes a control valve assembly 500, which is disposed below the combustion heat exchange body 300, and an electric control box 400 is disposed on the control valve assembly 500. Preferably, the electric control box 400 is disposed on the water inlet valve or the pipeline where the water inlet valve is located.

[0051] In another embodiment, the electric control box 400 is located on a side of the control valve assembly 500 close to the back plate 110. After the burner 310 is arranged on the side of the expansion tank 200 away from the back plate 110, since the control valve assembly 500 is directly or indirectly connected to the burner 310, there is a certain gap between the control valve assembly 500 and the back plate 110. In this embodiment, by locating the electric control box 400 on the side of the control valve assembly 500 close to the back plate 110, the space under the burner 310 can be further utilized, thereby further optimizing the internal structure of the water heater 10 and making the internal structure of the water heater 10 more compact.

[0052] In one embodiment, in order to improve the energy utilization rate of the water heater 10, the water heater 10 includes a waste heat recovery device 600. In order to maximize the use of the internal space of the water heater 10, achieve the purpose of reducing the size of the entire machine, and meet the user's installation requirements, the waste heat recovery device 600 is arranged above the combustion heat exchange body 300 and the expansion water tank 200.

[0053] In a preferred embodiment, the expansion water tank 200 is arranged in a square shape. Conventional expansion water tanks 200 are mostly circular. Compared with conventional expansion water tanks 200, the square water tank of this embodiment can better utilize the space inside or outside the water heater 10, making the overall device more compact. It can be more easily stacked or installed side by side with other square or rectangular components during installation, saving space. The force is relatively uniform, which can better withstand internal pressure changes and reduce deformation and stress concentration. For example, in this embodiment, the combustion chamber 301 can be installed on the expansion water tank 200.

[0054] It should be understood that in the embodiments of the present invention, the above-mentioned directional names such as “above” and “below” are all determined after the gas water heater 10 is installed in the building, and are directional determined with the burner 310 as a reference.

[0055] The above description is only an exemplary 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 technical 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, the housing comprising a back plate; An expansion water tank, disposed in the shell and on the back plate; as well as The combustion and heat exchange body is arranged in the shell and is located at a side of the expansion water tank away from the back plate.

2. The water heater according to claim 1, characterized in that: The combustion heat exchange body includes a burner and a fan, the air outlet side of the fan is connected to the air inlet of the burner, and the fan is arranged below the burner.

3. The water heater according to claim 2, characterized in that: The water heater comprises an electric control box, and the electric control box is arranged below the combustion and heat exchange body.

4. The water heater according to claim 3, characterized in that: The combustion heat exchange body has a combustion chamber, and the distance between the electric control box and the combustion chamber is greater than 20 mm.

5. The water heater according to claim 4, characterized in that: The electric control box is arranged on a side of the fan away from the combustion chamber.

6. The water heater according to claim 3, characterized in that: The water heater further comprises a control valve assembly, wherein the control valve assembly is arranged below the combustion and heat exchange body, and the electric control box is arranged on the control valve assembly.

7. The water heater according to claim 6, characterized in that The electric control box is located on a side of the control valve assembly close to the back plate.

8. The water heater according to claim 2, characterized in that: An air intake channel is formed between the air outlet side of the fan and the air inlet of the burner; the water heater includes a first air distribution plate and a second air distribution plate, the first air distribution plate and the second air distribution plate are arranged along the flow direction of the air intake channel, and the first air distribution plate and the second air distribution plate are both used to adjust the flow area of ​​the air intake channel.

9. The water heater according to any one of claims 1 to 8, characterized in that: The water heater comprises a waste heat recovery device, and the waste heat recovery device is arranged above the combustion heat exchange body and the expansion water tank.

10. The water heater according to any one of claims 1 to 8, characterized in that: The expansion water tank is arranged in a square shape.

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