Waste heat absorption water storage structure with high heat utilization rate and gas water heater

Abstract

A waste heat absorption water storage structure and a gas water heater with high heat utilization rate belong to the technical field of household appliances. The pre-heat exchange water storage structure includes a heat exchanger and a fan, and also includes a water storage component; a smoke exhaust channel and a water storage chamber are arranged in the water storage component; the smoke exhaust channel includes a plurality of parallel sub-channels, and a smoke mixing part is arranged at the turning point of the plurality of sub-channels, and a mixing path is arranged in the smoke mixing part; after the smoke flows through the smoke mixing part, the sub-channel has a gradually decreasing aperture along the outflow direction of the smoke; an electric auxiliary heating device for heating is arranged in the water storage chamber; the water storage chamber is connected to the water flow channel of the heat exchanger and is not connected to the smoke exhaust channel. The present invention is provided with a water storage component for storing water, and the stored water absorbs the smoke exhausted by the fan, and can also preheat the stored water, thereby improving the heat exchange efficiency of the gas water heater and reducing the time users wait for hot water.

Description

Technical Field

[0001] The invention belongs to the technical field of household appliances, and in particular relates to a waste heat absorption water storage structure and a gas water heater with high heat utilization rate. Background Art

[0002] A gas water heater is a gas water heater that uses gas as fuel and transfers heat to cold water flowing through a heat exchanger through combustion heating to achieve the purpose of preparing hot water. However, in the prior art, the burner inside the gas water heater still has a temperature of about 100-200°C after heat exchange through the heat exchanger and is directly discharged to the outside. In other words, the waste heat of the flue gas after heat exchange is not effectively utilized. At the same time, there is room for further optimization of the waiting time for users to get hot water. Summary of the invention

[0003] In order to solve the above technical problems, the present application further improves the internal structure of the gas water heater, in order to improve the heat utilization rate of the flue gas after heat exchange and reduce the time users have to wait for hot water. One of the purposes of the present invention is to provide a waste heat absorption and water storage structure with high heat utilization rate, and the second purpose is to provide a corresponding gas water heater.

[0004] The specific technical solution is described below:

[0005] A waste heat absorption and water storage structure with high heat utilization rate includes a heat exchanger and a fan arranged on the flue gas outlet path of the heat exchanger, and also includes:

[0006] A water storage component disposed at the outlet of the fan;

[0007] The water storage assembly is provided with a smoke exhaust channel and a water storage cavity, and the water storage cavity covers at least a portion of the outer surface of the smoke exhaust channel;

[0008] The smoke exhaust channel includes a plurality of parallel sub-channels, and a smoke mixing portion is provided at the turning points of the plurality of sub-channels, and a mixing path whose cross-sectional area is repeatedly reduced and then expanded is provided in the smoke mixing portion;

[0009] After the smoke flows through the smoke mixing part, the sub-channel has a gradually decreasing aperture along the outflow direction of the smoke;

[0010] An electric auxiliary heating device for heating is provided in the water storage cavity;

[0011] The water storage chamber is communicated with the water flow channel of the heat exchanger.

[0012] In the above technical solution, the water storage component arranged at the fan outlet is used to store water, and the stored water absorbs the smoke discharged by the fan, and can also preheat the stored water, thereby improving the heat exchange efficiency of the gas water heater, reducing the time users wait for hot water, and optimizing the user experience.

[0013] in:

[0014] For the smoke exhaust channel, especially for the smoke exhaust channel after the smoke flows through the smoke mixing part, the heat exchange efficiency of the smoke is one of the core factors affecting the heating effect of the water storage component. Therefore, the improvement of the present invention is also reflected in the following aspects:

[0015] ① By gradually limiting the aperture of some sub-channels, the corresponding space when the smoke flows out is gradually reduced. Relatively speaking, the pressure inside the smoke exhaust channel will increase appropriately. The increase in pressure is manifested in more frequent and intense collisions between smoke molecules at the microscopic level, which means that - from the principle of heat conduction - the frequency and probability of heat transfer are improved. It also means - from the principle of heat convection - the flow state of smoke inside the smoke exhaust channel is more intense, the uniformity of heat flow and the speed of heat transfer are enhanced, thereby improving the heat exchange efficiency;

[0016] ② The mixed flow structure of the flue gas mixing part can amplify the heat transfer effect of the above-mentioned pressurization process, achieving the effect of 1+1>2, further improving the heat transfer efficiency;

[0017] ③ As a tapered tube that is thin at the top and thick at the bottom, in the sub-channel after the flue gas mixing section, the flow rate becomes faster and the pressure becomes smaller as it goes up. The pressure difference forms a drainage effect, which facilitates the outflow of flue gas.

[0018] Preferably, after the flue gas flows through the flue gas mixing section, the aperture ratio of the inlet and outlet of the sub-channel is (1.5-2.5):1.

[0019] Preferably, the flue gas mixing section includes a plurality of sub-mixing sections, each of which connects at least some of the sub-channels. The flue gas mixing section can improve the heat exchange uniformity and heat exchange effect. The sub-mixing sections further improve the heat exchange uniformity by connecting the sub-channels.

[0020] Further preferably, the sub-mixing section has a plurality of mixing surfaces with different orientations, which can increase the heat exchange area and form flue gas with different flow directions through reflection, thereby enhancing the thermal convection effect.

[0021] For the mixing path, its specific expression can be: a number of spacer columns are arranged at intervals in the mixing path, each spacer column has four side walls, each side wall is a curved surface, and each curved surface serves as the above-mentioned mixing surface. The bending method makes the spacer column form a mixing structure with thicker ends and thinner middle. When the flue gas flows through the mixing structure, the change in the cross-sectional area of ​​the path makes the flue gas always in a state of compression-expansion, and the heat in the flue gas can be fully diffused and conducted.

[0022] Preferably, the electric auxiliary heating device includes a heating tube arranged in the water storage cavity and a heating joint arranged outside the water storage cavity, and the heating tube is heated by energizing the heating joint. Further preferably, the heating tube is arranged at the bottom of the water storage cavity, so that the water can be heated from the moment it enters the water storage cavity, and the smoke exhaust channel can be avoided.

[0023] Preferably, the air outlet of the fan is laterally arranged; the water storage assembly has a vertically distributed water storage space, and the smoke exhaust inlet and the smoke exhaust outlet of the smoke exhaust channel have staggered smoke exhaust flow trajectories; further preferably, the smoke exhaust inlet of the smoke exhaust channel is arranged at the side wall of the water storage assembly, and the smoke exhaust outlet of the smoke exhaust channel is arranged at the upper surface of the water storage assembly.

[0024] The horizontally arranged fan outlet prevents the smoke from being discharged directly upwards. It cooperates with the arrangement of the smoke exhaust channel to form a circuitous channel, which is conducive to sufficient heat exchange and convenient for arrangement in a relatively narrow space.

[0025] Preferably, the water inlet and outlet of the water storage chamber have staggered drainage flow trajectories; further preferably, the water inlet of the water storage chamber is arranged at the lower surface of the water storage assembly, and the water outlet of the water storage chamber is arranged at the side wall of the water storage assembly. Further preferably, the smoke exhaust inlet and the water outlet are arranged on the same side wall to facilitate arrangement in a narrow space.

[0026] Preferably, a smoke collecting hood is provided between the heat exchanger and the inlet of the fan.

[0027] Preferably, the heat exchanger, the smoke hood and the fan are sequentially arranged in the vertical direction from bottom to top, and the vertical arrangement has the advantage of high integration.

[0028] Preferably, the water storage chamber and the smoke exhaust channel are not connected.

[0029] A gas water heater is provided with a water storage structure as described in any of the above technical solutions.

[0030] In summary, the technical solution of the present invention has the following main beneficial effects:

[0031] Compared with the prior art, the technical solution of the present invention utilizes the water stored in the water storage component to absorb the waste heat of the flue gas and preheats the stored water at the same time, which can improve the heat exchange efficiency of the gas water heater, shorten the time users wait for hot water, and improve the user experience.

[0032] For the smoke exhaust channel, especially for the smoke exhaust channel after the smoke flows through the smoke mixing part, the heat exchange efficiency of the smoke is one of the core factors affecting the heating effect of the water storage component. Therefore, the improvement of the present invention is also reflected in the following aspects:

[0033] ① By gradually limiting the aperture of some sub-channels, the corresponding space when the smoke flows out is gradually reduced. Relatively speaking, the pressure inside the smoke exhaust channel will increase appropriately. The increase in pressure is manifested in more frequent and intense collisions between smoke molecules at the microscopic level, which means that - from the principle of heat conduction - the frequency and probability of heat transfer are improved. It also means - from the principle of heat convection - the flow state of smoke inside the smoke exhaust channel is more intense, the uniformity of heat flow and the speed of heat transfer are enhanced, thereby improving the heat exchange efficiency;

[0034] ② The mixed flow structure of the flue gas mixing part can amplify the heat transfer effect of the above-mentioned pressurization process, achieving the effect of 1+1>2, further improving the heat transfer efficiency;

[0035] ③ As a tapered tube that is thin at the top and thick at the bottom, in the sub-channel after the flue gas mixing section, the flow rate becomes faster and the pressure becomes smaller as it goes up. The pressure difference forms a drainage effect, which facilitates the outflow of flue gas.

[0036] Further or more detailed beneficial effects will be described in detail in conjunction with specific examples in the specific implementation manner. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 is a schematic diagram of the internal structure of the gas water heater in the embodiment;

[0038] Figure 2 is a front view structural schematic diagram of the water storage assembly in the embodiment;

[0039] Figure 3 is a schematic diagram of the three-dimensional structure of the water storage assembly in the embodiment;

[0040] Figure 4 Schematic diagram of the internal cross-sectional structure of the water storage assembly in the embodiment.

[0041] Reference numerals:

[0042] 1: Water storage component;

[0043] 1.1: smoke exhaust channel, 1.11: smoke exhaust inlet, 1.12: smoke exhaust outlet, 1.13: sub-channel, 1.14: smoke mixing section, 1.141: sub-mixing section, 1.141a: mixing surface;

[0044] 1.2: water storage chamber, 1.21: water inlet, 1.22: water outlet;

[0045] 1.3: electric auxiliary heating device, 1.31: heating tube, 1.32: heating joint;

[0046] 2: Heat exchanger, 3: Fan, 4: Fume hood, 5: Burner. DETAILED DESCRIPTION

[0047] The present invention is further explained with reference to the following embodiments:

[0048] The core technical problem faced by the technical solution of the embodiment of the present application comes from the inventor's accurate understanding of the existing technology. Therefore, how to improve the thermal utilization rate of the gas water heater, reduce the time users wait for hot water, and improve the user experience are technical problems that the inventor urgently needs to solve.

[0049] It should be noted that the embodiments do not constitute a limitation on the protection scope of the claims of the present invention. According to the technical concepts provided / proven by the embodiments, all technical solutions that can be reasonably anticipated by technicians in the relevant technical field should be included in the protection scope of the claims of the present invention.

[0050] The embodiments are described in detail as follows:

[0051] Please refer to the attached Figures 1 to 4 This embodiment relates to a preheating water storage structure with an electric auxiliary heating device, which is arranged in the shell of a gas water heater, and includes a fan 3, a smoke collecting hood 4, a heat exchanger 2 and a burner 5 arranged in sequence from top to bottom, wherein the suction port of the fan 3 faces downward and is arranged on the path of the smoke outlet in the heat exchanger 2, and the outlet of the fan 3 faces the horizontal direction;

[0052] The structure also includes a water storage assembly 1 arranged at the outlet of the fan 3, and the water storage assembly 1 is provided with a smoke exhaust channel 1.1, a water storage cavity 1.2 and an electric auxiliary heating device 1.3;

[0053] The water storage chamber 1.2 is used to store water, and covers a portion of the outer surface of the smoke exhaust channel 1.1, and is not connected to the smoke exhaust channel 1.1. The water storage chamber 1.2 is arranged vertically, and the smoke exhaust inlet 1.11 of the smoke exhaust channel 1.1 is arranged at the side wall of the water storage component 1, and the water outlet 1.22 of the water storage chamber 1.2 is arranged at the same side wall, and the smoke exhaust outlet 1.12 of the smoke exhaust channel 1.1 is arranged at the upper surface of the water storage component 1, and the water inlet 1.21 of the water storage chamber 1.2 is arranged at the lower surface of the water storage component 1, and the water storage chamber 1.2 is connected to the water flow channel of the heat exchanger 2 through the above-mentioned water outlet 1.22;

[0054] The electric auxiliary heating device 1.3 includes a heating tube 1.31 arranged in the water storage chamber 1.2 and a heating joint 1.32 arranged outside the water storage chamber 1.2. Power is supplied through the heating joint 1.32, and heating is performed through the heating tube 1.31. In a preferred embodiment, the heating tube 1.31 is arranged at the bottom of the water storage chamber 1.2, so that the water can be heated from the moment it enters the water storage chamber 1.2, and the arrangement of the smoke exhaust channel 1.1 is conveniently avoided.

[0055] The smoke exhaust channel 1.1 includes a plurality of parallel sub-channels 1.13, and a smoke mixing section 1.14 is provided at the turning point where the plurality of sub-channels 1.13 turn from horizontal to vertical. The smoke mixing section 1.14 includes a plurality of sub-mixing sections 1.141, and each sub-mixing section 1.141 connects a row of sub-channels 1.13 at the turning point thereof. A mixing path whose cross-sectional area is repeatedly reduced and then expanded is provided in each sub-mixing section 1.141. The mixing path in the present embodiment is specifically manifested as follows: a plurality of spacer columns are provided at intervals in the mixing path, and each spacer column has four side walls, and each side wall is a curved surface, and each curved surface is a mixing surface 1.141a. The bending mode makes the spacer columns form a mixing structure with thicker ends and thinner middle. When the smoke flows through the mixing structure, the change of the cross-sectional area of ​​the path makes the smoke always in a state of being compressed and expanded, so that the heat in the smoke can be fully diffused and conducted.

[0056] In a further preferred embodiment, a plurality of spacer columns are arranged in an array in the sub-mixing section 1.141;

[0057] After the smoke flows through the smoke mixing part 1.14, the sub-channel 1.13 has a gradually decreasing aperture along the outflow direction of the smoke. Specifically, the aperture ratio of the inlet and outlet of the sub-channel 1.13 is controlled at 1.5-2.5:1, and the sub-mixing part 1.141 has a plurality of mixing surfaces 1.141a with different directions.

[0058] In the technical solution of this embodiment, the water storage assembly 1 arranged at the outlet of the fan 3 is used to store water, and the stored water absorbs the smoke exhausted by the fan 3, and can also preheat the stored water through the electric auxiliary heating device 1.3, which not only makes better use of the waste heat of the smoke and improves the heat exchange efficiency of the gas water heater, but also shortens the time for users to wait for hot water, thereby improving the user experience;

[0059] The horizontally arranged outlet of the fan 3 prevents the smoke from being discharged directly upwards, and forms a circuitous channel in combination with the arrangement of the smoke exhaust channel 1.1, which is conducive to sufficient heat exchange;

[0060] At the same time, the flue gas mixing section 1.14 can improve the heat exchange uniformity and heat exchange effect. Each sub-mixing section 1.141 is connected to a row of sub-channels 1.13 to further improve the heat exchange uniformity.

[0061] Further:

[0062] In this embodiment, by gradually narrowing the aperture of some sub-channels 1.13, the corresponding space when the smoke flows out is gradually reduced. Relatively speaking, the internal pressure of the smoke exhaust channel 1.1 will increase, which is manifested in more frequent and intense collisions between smoke molecules at the microscopic level, which means that the frequency and probability of heat transfer are increased, and the flow state of smoke in the smoke exhaust channel is more intense, and the uniformity of heat flow and the speed of heat transfer are enhanced, thereby improving the heat exchange efficiency;

[0063] At the same time, the mixed flow structure of the flue gas mixing part 1.14 can be used to amplify the heat transfer effect of the above-mentioned supercharging process, achieving the effect of 1+1>2. The plurality of mixing surfaces 1.141a facing different directions can increase the heat exchange area and facilitate the formation of flue gases in different directions through reflection, thereby enhancing the heat convection effect and further improving the heat transfer efficiency.

[0064] As a tapered tube that is thin at the top and thick at the bottom, in the sub-channel 1.13 after the smoke mixing section 1.14, the flow velocity increases and the pressure decreases as it goes upwards, and the pressure difference forms a drainage effect, which facilitates the outflow of smoke.

[0065] The structure described in this embodiment is also convenient to arrange in a relatively narrow space and has the advantage of high integration.

[0066] In the aforementioned embodiment, the heating pipe 1.31 is arranged at the water inlet 1.21 of the water storage chamber 1.2, that is, water flows in from the water inlet 1.21, is heated, and then exchanges heat with the hot flue gas in the flue gas mixing part 1.14, so that the temperature difference between the flue gas and the water during heat exchange becomes smaller due to the prior heating. When the temperature difference is reduced, the heat transfer power during heat exchange is also reduced synchronously, which will have an adverse effect on the improvement of heat exchange efficiency;

[0067] In view of this, in a preferred embodiment, the heating pipe 1.31 of the electric auxiliary heating device 1.3 is arranged at the water outlet 1.22 to heat the water that is about to flow out. The heating pipe 1.31 is arranged in this way so that the contact area between the flue gas mixing part 1.14 and the water maintains as large a temperature difference as possible. After the water has fully exchanged heat with the hot flue gas, it is heated by the heating pipe 1.31 at the water outlet 1.22, thereby obtaining better heat exchange efficiency, being more energy-saving and environmentally friendly, and at the same time not affecting the beneficial effect of the electric auxiliary heating device 1.3 in accelerating the formation of hot water.

[0068] The embodiment also relates to a gas water heater, wherein the pre-heat exchange water storage structure described in any of the above embodiments is arranged inside the gas water heater.

[0069] In the description of this specification, the description with reference to the terms "embodiment", "basic embodiment", "preferred embodiment", "other embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0070] Although the preferred embodiments of the present invention have been described, those skilled in the art may make other changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the present invention.

[0071] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. A waste heat absorption and water storage structure with high heat utilization rate, comprising a heat exchanger (2) and a fan (3) arranged on the flue gas outlet path of the heat exchanger (2), characterized in that: Also included are: A water storage component (1) disposed at the outlet of the fan (3); The water storage component (1) is provided with a smoke exhaust channel (1.1) and a water storage chamber (1.2), and the water storage chamber (1.2) covers at least a portion of the outer surface of the smoke exhaust channel (1.1); The smoke exhaust channel (1.1) comprises a plurality of parallel sub-channels (1.13), a smoke mixing section (1.14) is provided at the turning points of the plurality of sub-channels (1.13), and a mixing path whose cross-sectional area repeatedly shrinks and then expands is provided in the smoke mixing section (1.14); After the smoke flows through the smoke mixing portion (1.14), the sub-channel (1.13) has a gradually decreasing aperture along the smoke outflow direction; An electric auxiliary heating device (1.3) for heating is arranged in the water storage cavity (1.2); The water storage chamber (1.2) is in communication with the water flow channel of the heat exchanger (2).

2. The water storage structure according to claim 1, characterized in that: After the flue gas flows through the flue gas mixing section (1.14), the aperture ratio of the inlet and outlet of the sub-channel (1.13) is (1.5-2.5):

1.

3. The water storage structure according to claim 1 or 2, characterized in that: The flue gas mixing section (1.14) comprises a plurality of sub-mixing sections (1.141), and each of the sub-mixing sections (1.141) enables at least part of the sub-channels (1.13) to communicate with each other.

4. The water storage structure according to claim 3, characterized in that: The sub-mixing section (1.141) has a plurality of mixing surfaces (1.141a) facing in different directions.

5. The water storage structure according to claim 4, characterized in that: A plurality of spacer columns are arranged at intervals in the mixing path, each spacer column has a plurality of side walls, each side wall is formed by the mixing surface (1.141a), and the spacer columns form a mixing structure that is thicker at both ends and thinner in the middle.

6. The water storage structure according to claim 1, characterized in that: The electric auxiliary heating device (1.3) comprises a heating tube (1.31) arranged in the water storage chamber (1.2) and a heating joint (1.32) arranged outside the water storage chamber (1.2).

7. The water storage structure according to claim 6, characterized in that: The heating pipe (1.31) is arranged at the bottom of the water storage chamber (1.2).

8. The water storage structure according to claim 1, characterized in that: The air outlet of the fan (3) is arranged laterally, the water storage assembly (1) has a vertically distributed water storage space, and the smoke exhaust inlet (1.11) and the smoke exhaust outlet (1.12) of the smoke exhaust channel (1.1) have staggered smoke exhaust flow trajectories.

9. The water storage structure according to claim 8, characterized in that: The smoke exhaust inlet (1.11) of the smoke exhaust channel (1.1) is arranged on the side wall of the water storage component (1), and the smoke exhaust outlet (1.12) of the smoke exhaust channel (1.1) is arranged on the upper surface of the water storage component (1).

10. The water storage structure according to claim 8, characterized in that: The water inlet (1.21) and the water outlet (1.22) of the water storage chamber (1.2) have staggered drainage flow trajectories.

11. The water storage structure according to claim 10, characterized in that: The water inlet (1.21) of the water storage cavity (1.2) is arranged on the lower surface of the water storage component (1), and the water outlet (1.22) of the water storage cavity (1.2) is arranged on the side wall of the water storage component (1).

12. The water storage structure according to claim 10, characterized in that: The smoke exhaust inlet (1.11) and the water outlet (1.22) are arranged on the same side wall.

13. The water storage structure according to claim 1, characterized in that: The water storage chamber (1.2) and the smoke exhaust channel (1.1) are not connected.

14. Gas water heater, characterized in that: A water storage structure according to any one of claims 1 to 13 is arranged inside.

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