Heat exchanger with preheating function and gas water heater thereof

Abstract

The heat exchanger with the preheating function comprises a water tank shell and a water pipe, a heat exchange assembly is arranged in the top area of the inner side of the water tank shell, the two ends of the water pipe comprise a water inlet, a water outlet, a first preheating section and a second preheating section, and the first preheating section and the second preheating section are located between the water inlet and the water outlet. The first preheating section is arranged on the peripheral side of the water tank shell in a surrounding mode, the second preheating section is located at the top of the heat exchange assembly, cold water flowing through the water pipe is preheated twice, and therefore the water inlet temperature of the cold water is increased before the cold water enters the heat exchange pieces. On the basis, under the conditions that the load is equal and the water outlet amount is kept unchanged, the actual water outlet temperature and the heat efficiency of the gas water heater can be improved by increasing the water inlet temperature; under the conditions that the load is equal and the water outlet temperature is kept unchanged, the actual water outlet amount of the gas water heater can be increased by increasing the water inlet temperature; according to the gas water heater, the use experience of a user can be improved by improving the water outlet temperature and the heat efficiency or increasing the water outlet amount of hot water, and compared with a gas water heater with the same water outlet amount or the same water outlet temperature, the gas water heater has the advantages of being small in size, light in weight, convenient to carry and the like.

Description

Technical Field

[0001] The utility model relates to the technical field of gas water heaters, in particular to a heat exchanger with a preheating function and a gas water heater thereof. Background Art

[0002] A gas water heater is a gas-fired appliance that uses gas as fuel to produce hot water through combustion and heating. With the development of society, gas water heaters are finding a wider range of applications, such as on-board gas water heaters used in RVs and household gas water heaters. These water heaters are often marketed for their compact size and light weight.

[0003] To improve the user experience, the water output of a gas water heater can be increased without affecting the outlet water temperature. Under the same load, increasing the water output without affecting the outlet water temperature requires increasing the size of the heat exchanger and burner. This increases the size and weight of the gas water heater, thus losing its portability advantages such as compactness and lightness. Increasing the water output without increasing the heat exchanger and burner will result in a decrease in the outlet water temperature, thus affecting the user experience.

[0004] Therefore, there is an urgent need in the prior art to invent a gas water heater that is both portable and can improve user experience. Utility Model Content

[0005] In order to overcome the technical problem that the gas water heaters described in the above-mentioned prior art cannot take into account both portability and user experience, the utility model provides a heat exchanger with a preheating function and a gas water heater thereof, which has the characteristics of small size, high thermal efficiency and large water output.

[0006] The technical solution adopted by the present invention to solve the problem is:

[0007] A heat exchanger with a preheating function is provided, comprising:

[0008] A water tank shell, wherein a heat exchange component is provided in the inner top area of the water tank shell;

[0009] A water pipe, the water pipe includes a water inlet and a water outlet arranged at both ends thereof, and a first preheating section and a second preheating section located between the water inlet and the water outlet, the first preheating section is arranged around the outer peripheral side of the water tank shell, the second preheating section is located at the top of the heat exchange component, and the first preheating section and the second preheating section are connected to each other.

[0010] In a preferred embodiment of the present invention, a technical solution for the structural design of the first preheating section and the second preheating section is provided.

[0011] In this preferred embodiment, the first preheating section is located on a side close to the water inlet, and the second preheating section is located on a side close to the water outlet.

[0012] Furthermore, the first preheating section surrounds the water tank shell in at least two circles.

[0013] In another preferred embodiment of the present invention, a technical solution for the structural design of the heat exchange component and the second preheating section is provided.

[0014] In this preferred embodiment, the heat exchange assembly includes a plurality of heat exchange fins arranged in a vertical direction, and the heat exchange fins are stacked in sequence in a horizontal direction.

[0015] Furthermore, at least a portion of the top of the heat exchange plate is sunken downward to form a recess, and the second preheating section is arranged corresponding to the recess.

[0016] In another preferred embodiment of the present invention, a technical solution for the structural design of the second preheating section and the heating section is provided.

[0017] In this preferred embodiment, the water pipe further includes a heating section, which is disposed inside the heat exchange component, and the second preheating section and the heating section are alternately disposed in sequence.

[0018] Furthermore, a connecting section is provided between the second preheating section and the heating section, and the connecting section is a U-shaped structure.

[0019] Furthermore, the number of the second preheating sections and the heating sections is at least two groups.

[0020] Based on the same design concept, the utility model also provides a gas water heater, which includes the above-mentioned heat exchanger with preheating function.

[0021] Furthermore, the gas water heater also includes a burner, which is arranged at the bottom of the water tank shell.

[0022] In summary, in the solution of the present invention, the water pipe of the heat exchanger includes a first preheating section and a second preheating section, which can perform a double preheating operation on the cold water flowing through the water pipe, thereby raising the inlet temperature of the cold water before entering the heat exchange component. Based on this, the heat exchanger and its gas water heater of the present invention have at least the following technical effects:

[0023] 1) Under the condition of equal load and keeping the water output unchanged, increasing the inlet water temperature can increase the actual water outlet temperature and thermal efficiency of the gas water heater;

[0024] 2) Under the condition of equal load and keeping the outlet water temperature unchanged, increasing the inlet water temperature can increase the actual water output of the gas water heater;

[0025] 3) Under the premise of the same load, whether it is to improve the water outlet temperature and thermal efficiency, or to increase the hot water output, the user experience can be improved; and compared with gas water heaters with the same water output or the same water outlet temperature, the gas water heater of the utility model has the advantages of small size, light weight and easy to carry. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 This is a first structural schematic diagram of a heat exchanger with a preheating function according to the present invention;

[0027] Figure 2 This is a second structural schematic diagram of the heat exchanger with preheating function of the present utility model;

[0028] Figure 3 This is a third structural schematic diagram of the heat exchanger with preheating function of the present utility model;

[0029] Figure 4 This is a fourth structural schematic diagram of the heat exchanger with preheating function of the present utility model;

[0030] Figure 5 This is a first structural diagram of the water pipe and heat exchange fin of the utility model;

[0031] Figure 6 This is a second structural schematic diagram of the water pipe and heat exchange fin of the utility model;

[0032] The meanings of the reference numerals are as follows:

[0033] 1. Water tank shell; 2. Heat exchange component; 3. Water pipe; 31. Water inlet; 32. Water outlet; 4. First preheating section; 5. Second preheating section; 6. Heating section; 7. Connecting section. DETAILED DESCRIPTION

[0034] For better understanding and implementation, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0035] In the description of the present invention, it should be noted that the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as limitations on the present invention.

[0036] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art in the art of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention.

[0037] Figure 1 and Figure 3 The left and right views of the heat exchanger with preheating function of the utility model are as follows: Figure 2 This is the main view of the heat exchanger with preheating function of the utility model. Figure 4 This is a top view of the heat exchanger with preheating function of the present invention.

[0038] See also Figures 1-4 As shown, the heat exchanger with a preheating function of the present invention includes a water tank housing 1, with a heat exchange assembly 2 disposed in the inner top area of the water tank housing 1. The water tank housing 1 contains water, and the combustion of the gas water heater's burner heats the water tank housing 1, thereby converting the cold water in the water tank housing 1 into hot water. Furthermore, the water tank housing 1 transfers heat to the heat exchange assembly 2 in the inner top area thereof. This heat exchange assembly 2 increases the heat exchange area and efficiency with the water pipe 3, thereby heating the water flowing through the water pipe 3.

[0039] The heat exchanger with a preheating function also includes a water pipe 3, which includes a first preheating section 4 and a second preheating section 5 that are interconnected. The first preheating section 4 is arranged around the outer peripheral side of the water tank shell 1, and the second preheating section 5 is located on the top of the heat exchange component 2. Specifically, when the burner of the gas water heater burns, it heats the water tank shell 1 to increase its temperature, and the flue gas generated by the combustion exhaust flows upward. Therefore, the first preheating section 4 is arranged around the water tank shell 1, so that it can absorb the heat of the water tank shell 1 and complete the first preheating of the cold water flowing through the first preheating section 4. The second preheating section 5 is arranged above the heat exchange component 2, which can absorb the heat of the flue gas generated by the combustion exhaust and the heat radiated upward by the water tank shell 1, and complete the second preheating of the cold water flowing through the second preheating section 5.

[0040] Optionally, the first preheating section 4 may be in direct contact with the water tank shell 1; it may also be in contact with the water tank shell 1 through other connecting structures or heat transfer structures; or it may not be in contact with the water tank shell 1, with a preset distance between the two, and initial preheating is achieved through air heat transfer.

[0041] Similarly, the second preheating section 5 can be in direct contact with the heat exchange component 2; it can also be in contact with the heat exchange component 2 through other connecting structures or heat transfer structures; or it may not be in contact with the heat exchange component 2, with a preset distance between the two, and secondary preheating is achieved through air heat transfer.

[0042] See also Figure 2 As shown, water inlet pipes and water outlet pipes are provided at both ends of the water pipe 3. The water inlet pipe and the water outlet pipe are respectively provided with a water inlet 31 and a water outlet 32. The water inlet 31 and the water outlet 32 are connected to the first preheating section 4 and the second preheating section 5, and are used to pass cold water into the first preheating section 4 and the second preheating section 5, so that the cold water is preheated twice before being heated, thereby increasing the water inlet temperature.

[0043] In the technical solution of the present invention, the first preheating section 4 and the second preheating section 5 of the water pipe 3 can perform two preheating operations on the cold water flowing through the water pipe 3, thereby heating the cold water and raising its water inlet temperature. By raising the water inlet temperature, the actual water outlet temperature and thermal efficiency of the gas water heater can be raised under the same load and while the water outlet volume remains unchanged; the actual water outlet volume of the gas water heater can also be raised under the same load and while the water outlet temperature remains unchanged; of course, the actual water outlet temperature, thermal efficiency and actual water outlet volume of the gas water heater can also be raised at the same time under the same load (but the increase is smaller than that of the first two methods). By raising the water outlet temperature, thermal efficiency and hot water outlet volume, the user experience can be significantly improved, and compared to gas water heaters with the same water outlet volume or the same water outlet temperature, the gas water heater of the present invention has the advantages of being small in size, light in weight and easy to carry.

[0044] Example 1

[0045] In a preferred embodiment of the present invention, a technical solution for the structural design of the first preheating section 4 and the second preheating section 5 is provided.

[0046] See also Figure 1-Figure 3 As shown, in an optional solution of this embodiment, the first preheating section 4 is located on the side close to the water inlet 31, and the second preheating section 5 is located on the side close to the water outlet 32. Specifically, compared with the heat dissipated from the outer peripheral side of the water tank shell 1, the high-temperature flue gas emitted by the burner and the heat dissipated upward by the water tank shell 1 are higher, so the preheating effect of the second preheating section 5 of the present invention is better than the preheating effect of the first preheating section 4. Among them, the water inlet 31 is used to introduce cold water into the water pipe 3, so the temperature of the cold water close to the water inlet 31 is relatively low. By arranging the first preheating section 4 on the side close to the water inlet 31, the cold water can be preheated initially to increase its temperature. The water flow after the initial temperature increase passes through the second preheating section 5, and can complete the secondary preheating on the basis of a certain temperature, and the preheating effect is good. Compared with the design method of arranging the first preheating section 4 on the side close to the water outlet 32 and the second preheating section 5 on the side close to the water inlet 31, this embodiment can maximize the use of the heat of the water tank shell 1 and the heat generated by the combustion of gas.

[0047] See also Figure 1-Figure 3As shown, in another optional solution of this embodiment, the first preheating section 4 is wrapped around the water tank shell 1 for at least two turns. By increasing the number of turns of the first preheating section 4 around the water tank shell 1, the heat exchange area between the first preheating section 4 and the outer peripheral side of the water tank shell 1 can be increased, thereby improving the initial preheating efficiency of the first preheating section 4.

[0048] Example 2

[0049] In another preferred embodiment of the present invention, a technical solution for the structural design of the heat exchange component 2 and the second preheating section 5 is provided.

[0050] See also Figure 4 As shown, in an alternative embodiment of this embodiment, the heat exchange assembly 2 includes a plurality of heat exchange fins extending vertically, and the plurality of heat exchange fins are stacked in sequence horizontally to form the heat exchange assembly 2. Specifically, the plurality of heat exchange fins are disposed in the inner top region of the water tank housing 1 to heat the cold water flowing through the water pipe 3, so that the water outlet 32 of the water pipe 3 produces hot water at a higher temperature.

[0051] Further, see Figure 5 and Figure 6 As shown in the figure, the two figures respectively illustrate the second preheating section 5 and the structural styles of different heat exchange fin designs. In the heat exchange assembly 2, at least a portion (i.e., part or all) of the top of the heat exchange fins is recessed downward to form a concave portion, and the second preheating section 5 is arranged corresponding to this concave portion. The concave portion of the heat exchange fins provides space for the second preheating section 5 and increases the heat exchange area between the second preheating section 5 and the top area of the heat exchange fins, fully utilizing the preheat dissipated upward by the heat exchange fins and improving the secondary preheating effect of the second preheating section 5.

[0052] Optionally, the second preheating section 5 and the recess of the heat exchange plate may be in direct contact; or they may be in contact through a connecting structure or a heat transfer structure; or the second preheating section 5 and the recess of the heat exchange plate may not be in contact, but a preset distance may be set between them, and secondary preheating is achieved through air heat transfer.

[0053] Example 3

[0054] In another preferred embodiment of the present invention, a technical solution for the structural design of the second preheating section 5 and the heating section 6 is provided.

[0055] See also Figure 4-Figure 6As shown, in an optional solution of this embodiment, the water pipe 3 also includes a heating section 6, which is arranged inside the heat exchange component 2, and the second preheating section 5 and the heating section 6 are arranged alternately in sequence. The heating section 6 and the heat exchange component 2 exchange heat, thereby heating the water flowing through the heating section 6, and finally hot water with a higher temperature flows out from the water outlet 32. Specifically, the water pipe 3 wraps around the outer circumference of the water tank shell 1 several times, enters the water tank shell 1 and the heat exchange component 2, passes through the heat exchange component 2, bends, passes through the top area of the heat exchange component 2, and then bends and enters the interior of the heat exchange component 2. This alternating cycle causes the second preheating section 5 and the heating section 6 to be arranged alternately in sequence, thereby alternately completing the secondary preheating and heating of the water pipe 3. Alternatively, the water pipe 3 wraps around the outer circumference of the water tank shell 1 several times, passes through the water tank shell 1 and passes through the top area of the heat exchange component 2, bends to enter the interior of the heat exchange component 2, passes through the heat exchange component 2 and then bends to pass through the top area of the heat exchange component 2. This alternating cycle is repeated, so that the second preheating section 5 and the heating section 6 are alternately arranged in sequence, thereby alternately completing the secondary preheating and heating of the water pipe 3.

[0056] Further, see Figures 1-4 As shown, a connecting section 7 is provided between the second preheating section 5 and the heating section 6. This connecting section 7 has a U-shaped structure. Specifically, the second preheating section 5, the heating section 6, and the connecting section 7 are essentially an integrated structure. The U-shaped connecting section 7 is used to allow the water pipe 3 to bend from the second preheating section 5 to become the heating section 6, or vice versa.

[0057] Further, see Figure 4 As shown, there are at least two groups of second preheating sections 5 and heating sections 6. This means that the second preheating section 5 passes through at least two sections on the heat exchange assembly 2, and the heating section 6 passes through at least two sections within the heat exchange assembly 2. Specifically, by increasing the number of sections that the second preheating section 5 passes through above the heat exchange assembly 2, the heat exchange area of the second preheating section 5 can be increased, further fully utilizing the heat from the flue gas emitted by combustion and the waste heat dissipated upward from the water tank shell 1, thereby enhancing the secondary preheating effect on the second preheating section 5. Furthermore, by increasing the number of sections that the heating section 6 passes through within the heat exchange assembly 2, the heat exchange area between the heating section 6 and the heat exchange assembly 2 can be increased, thereby improving the heating effect on the heating section 6.

[0058] Example 4

[0059] Based on the same design concept, the present invention also provides an embodiment of a gas water heater, which includes the heat exchanger with preheating function described in the above embodiment.

[0060] In the technical solution of this embodiment, the gas water heater also includes a burner, which is arranged in the bottom area of the water tank shell 1. When the gas water heater starts working, the burner burns and heats the water in the water tank shell 1, causing the temperature of the water tank shell 1 and the heat exchange component 2 to rise. The heat on the outer peripheral side of the water tank shell 1 can be used to heat the first preheating section 4 to achieve the first preheating of the cold water; the heat of the flue gas generated by the burner combustion and the heat emitted upward from the water tank shell can be used to heat the second preheating section 5 to achieve the second preheating of the cold water; the heat on the heat exchange component 2 is used to transfer to the heating section 6 to heat the cold water inside it into hot water. After two preheating and heating, the water inlet temperature of the cold water can be increased before it enters the heat exchange component 2, thereby improving the actual water outlet temperature and thermal efficiency of the gas water heater under the same load and keeping the water outlet volume unchanged; or, under the same load and keeping the water outlet temperature unchanged, the actual water outlet volume of the gas water heater can be increased.

[0061] The technical means disclosed in the present invention are not limited to those disclosed in the above-mentioned embodiments, but also include technical solutions composed of any combination of the above-mentioned technical features. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principles of the present invention, and such improvements and modifications are also considered to be within the scope of protection of the present invention.

Claims

1. A heat exchanger with a preheating function, characterized in that: include: A water tank shell, wherein a heat exchange component is provided in the inner top area of the water tank shell; A water pipe, the water pipe includes a water inlet and a water outlet arranged at both ends thereof, and a first preheating section and a second preheating section located between the water inlet and the water outlet, the first preheating section is arranged around the outer peripheral side of the water tank shell, the second preheating section is located at the top of the heat exchange component, and the first preheating section and the second preheating section are connected to each other.

2. The heat exchanger with preheating function according to claim 1, characterized in that: The first preheating section is located on a side close to the water inlet, and the second preheating section is located on a side close to the water outlet.

3. The heat exchanger with preheating function according to claim 1, characterized in that: The first preheating section surrounds the water tank housing in at least two circles.

4. The heat exchanger with preheating function according to claim 1, characterized in that: The heat exchange assembly includes a plurality of heat exchange fins arranged in a vertical direction, and the heat exchange fins are stacked in sequence in a horizontal direction.

5. The heat exchanger with preheating function according to claim 4, characterized in that: At least a portion of the top of the heat exchange plate is sunken downward to form a recess, and the second preheating section is arranged corresponding to the recess.

6. The heat exchanger with preheating function according to claim 1, characterized in that: The water pipe further includes a heating section, which is arranged inside the heat exchange component, and the second preheating section and the heating section are alternately arranged in sequence.

7. The heat exchanger with preheating function according to claim 6, characterized in that: A connecting section is provided between the second preheating section and the heating section, and the connecting section is a U-shaped structure.

8. The heat exchanger with preheating function according to claim 6, characterized in that: The number of the second preheating section and the heating section is at least two.

9. A gas water heater, characterized in that: The heat exchanger comprises the heat exchanger with preheating function as described in any one of claims 1 to 8.

10. The gas water heater according to claim 9, characterized in that: The gas water heater further comprises a burner, which is arranged at the bottom of the water tank shell.

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