Flue gas waste heat recovery device and gas water heater

Abstract

The smoke waste heat recovery device comprises a smoke pipe assembly and a waste heat recovery mechanism, the smoke pipe assembly comprises a smoke pipe exhaust pipe, the waste heat recovery mechanism comprises a gravity heat pipe and heat exchange fins, and the gravity heat pipe comprises an evaporation section stretching into the smoke pipe exhaust pipe and a condensation section stretching out of the smoke pipe exhaust pipe; the heat exchange fins are connected to the condensation section. The gravity assisted heat pipe and the heat exchange fins are arranged, the evaporation section can absorb heat of smoke in the smoke pipe exhaust pipe, heat exchange media in the evaporation section are evaporated and flow to the condensation section, the condensation section is connected with the heat exchange fins for heat exchange, heat of the condensation section can be transmitted to the heat exchange fins, and the heat exchange fins can dissipate the heat indoors to heat surrounding air. After heat exchange, steam in the condensation section is cooled and condensed to form liquid, the condensed liquid flows to the evaporation section along the pipe wall of the gravity assisted heat pipe, redundant heat in smoke can be recovered, and therefore the purposes of waste heat recovery, energy conservation and emission reduction are achieved.

Description

Technical Field

[0001] The present application relates to the technical field of water heater accessories, and in particular to a flue gas waste heat recovery device and a gas water heater. Background Art

[0002] A gas water heater is a gas appliance that uses gas as fuel and transfers heat to cold water flowing through a heat exchanger through combustion to prepare hot water. The flue gas produced by the gas water heater is directly discharged into the atmosphere, but the heat carried by this part of the flue gas is not reasonably utilized, resulting in energy loss, which is not conducive to environmental protection and energy saving. Summary of the invention

[0003] Based on this, it is necessary to provide a flue gas waste heat recovery device and a gas water heater that can recover excess heat in the flue gas, thereby achieving the purpose of waste heat recovery, energy saving and emission reduction.

[0004] A flue gas waste heat recovery device, comprising:

[0005] A smoke pipe assembly, the smoke pipe assembly comprising a smoke pipe exhaust pipe;

[0006] The waste heat recovery mechanism includes a gravity heat pipe and heat exchange fins. The gravity heat pipe includes an evaporation section extending into the smoke exhaust pipe and a condensation section extending out of the smoke exhaust pipe. The gravity heat pipe contains a heat exchange medium, and the heat exchange fins are connected to the condensation section.

[0007] In the above scheme, by setting up gravity heat pipes and heat exchange fins, the evaporation section can absorb the heat of the flue gas in the smoke exhaust pipe, so that the heat exchange medium in the evaporation section evaporates and flows to the condensation section. The hot condensation section is connected to the heat exchange fins for heat exchange. The heat of the condensation section can be transferred to the heat exchange fins, which can better realize the heat transfer. The heat exchange fins after heat exchange can dissipate heat to the room to heat the surrounding low-temperature air. After heat exchange, the steam in the condensation section is cooled and condensed, thereby condensing into liquid. The condensed heat exchange medium flows to the evaporation section along the tube wall of the gravity heat pipe under the action of gravity, and circulates continuously. The indoor air will be heated by the heat exchange fins, which can realize the recovery of excess heat in the flue gas, thereby achieving the purpose of waste heat recovery, energy saving and emission reduction.

[0008] In one embodiment, the smoke duct assembly further includes a smoke duct air inlet pipe, which is sleeved on the outside of the smoke duct exhaust pipe, and the central axis of the smoke duct exhaust pipe is inclined toward the bottom of the smoke duct air inlet pipe relative to the central axis of the smoke duct air inlet pipe, and one end of the smoke duct exhaust pipe close to the smoke exhaust port is coaxially arranged with the smoke duct exhaust pipe.

[0009] By tilting the central axis of the smoke pipe exhaust pipe relative to the central axis of the smoke pipe inlet pipe toward the bottom of the smoke pipe inlet pipe, and coaxially arranging the end of the smoke pipe exhaust pipe close to the smoke exhaust port with the smoke pipe exhaust pipe, after the high-temperature flue gas exchanges heat with the evaporation section of the gravity heat pipe, the condensed water generated by cooling can be directly discharged to the outside through the smoke pipe exhaust pipe, thereby preventing the condensed water from flowing back into the gas water heater and damaging the gas water heater.

[0010] In one embodiment, the smoke pipe air inlet pipe and the smoke pipe exhaust pipe are both provided with a first through hole for inserting the gravity heat pipe;

[0011] And / or, a second through hole for inserting the gravity heat pipe is formed on the heat exchange fin, and the condensing section is connected to the second through hole by interference fit.

[0012] The interference fit connection between the condensing section and the second through hole can better transfer the heat of the condensing section to the heat exchange fins.

[0013] In one of the embodiments, the waste heat recovery mechanism further includes a vacuum insulation pipe, which is sleeved on the gravity heat pipe, and the vacuum insulation pipe is sleeved on a portion of the gravity heat pipe located between the smoke pipe inlet pipe and the smoke pipe exhaust pipe.

[0014] By arranging a vacuum insulation pipe between the evaporation section and the condensation section, the heat in the evaporation section can be effectively prevented from flowing to the condensation section, thereby playing an insulating role and preventing heat loss.

[0015] In one of the embodiments, the waste heat recovery mechanism further includes a mounting positioning member, and the gravity heat pipe is sealed and connected to the smoke duct air inlet pipe and the smoke duct exhaust pipe through the mounting positioning member.

[0016] In one embodiment, the mounting positioning member includes a fixing portion and a limiting boss arranged on the fixing portion, the fixing portion is provided with a third through hole for inserting the vacuum insulation pipe or the gravity heat pipe, and the limiting boss has a limiting surface abutting against the outer wall of the smoke duct inlet pipe.

[0017] In one of the embodiments, the fixing portion is sealed and connected to the vacuum insulation pipe or the gravity heat pipe;

[0018] And / or, the vacuum insulation tube is connected to the third through hole by interference fit.

[0019] By sealingly connecting the fixing part with the vacuum insulation pipe or gravity heat pipe, it is possible to effectively prevent moisture or air from leaking out of the gap between the vacuum insulation pipe or gravity heat pipe and the smoke pipe air inlet pipe and the smoke pipe exhaust pipe, thereby affecting the heat transfer between the evaporation section and the condensation section. The mounting positioning member is made of high temperature resistant rubber, which can play a sealing role. The vacuum insulation pipe is connected to the third through hole by interference fit, which can ensure the connection strength between the vacuum insulation pipe and the smoke pipe air inlet pipe and the smoke pipe exhaust pipe.

[0020] In one embodiment, the gravity heat pipe includes a plurality of gravity heat pipes, and the plurality of gravity heat pipes are arranged axially spaced apart from each other along the smoke pipe exhaust pipe;

[0021] And / or, the heat exchange fins include a plurality of heat exchange fins, and the plurality of heat exchange fins are spaced apart along the axial direction of the gravity heat pipe.

[0022] In one embodiment, the gravity heat pipe has a first end and a second end that are arranged opposite to each other, the first ends of the multiple gravity heat pipes are on the same horizontal plane, the evaporation section is located at the second end of the gravity heat pipe, and the lengths of the multiple gravity heat pipes extending into the smoke pipe exhaust pipe are the same.

[0023] The present application also provides a gas water heater, comprising the flue gas waste heat recovery device as described above. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The drawings constituting a part of the present application are used to provide a further understanding of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application.

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0026] Figure 1 This is a schematic diagram of the connection structure between a flue gas waste heat recovery device and a gas water heater shown in one embodiment of the present application.

[0027] Figure 2 This is a schematic structural diagram of a flue gas waste heat recovery device shown in one embodiment of the present application.

[0028] Figure 3 This is a structural cross-sectional view of a flue gas waste heat recovery device shown in one embodiment of the present application.

[0029] Figure 4 This is a schematic diagram of the connection structure of a waste heat recovery mechanism, a vacuum insulation pipe and an installation positioning member shown in an embodiment of the present application.

[0030] Description of Reference Numerals

[0031] 10. Flue gas waste heat recovery device; 100. Smoke pipe assembly; 110. Smoke pipe exhaust pipe; 120. Smoke pipe air inlet pipe; 130. Bend pipe; 200. Waste heat recovery mechanism; 210. Gravity heat pipe; 211. Evaporation section; 212. Condensation section; 220. Heat exchange fins; 300. Vacuum insulation pipe; 400. Installation positioning member; 410. Fixing part; 420. Limiting boss; 421. Limiting surface; 20. Gas water heater. DETAILED DESCRIPTION

[0032] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present application, so the present application is not limited by the specific embodiments disclosed below.

[0033] In the description of the present application, it should be understood that if the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. appear, the orientation or position relationship indicated by these terms is based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application.

[0034] In addition, if the terms "first" or "second" appear, these terms are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of this application, if the term "plurality" appears, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0035] In this application, unless otherwise clearly specified and limited, if the terms "installed", "connected", "connected", "fixed" and the like appear, these terms should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integrated connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0036] In the present application, unless otherwise clearly specified and limited, if there is a description that a first feature is "above" or "below" a second feature, etc., or similar descriptions appear, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "above" and "above" the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. The first feature being "below", "below" and "below" the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0037] It should be noted that if an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. If an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. If any, the terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in this application are for illustrative purposes only and do not represent the only implementation method.

[0038] See also Figure 1 An embodiment of the present application provides a flue gas waste heat recovery device 10 for use with a gas water heater 20 to recover heat from the flue gas discharged by the gas water heater 20 .

[0039] See also Figure 1 and Figure 2 The flue gas waste heat recovery device 10 includes a smoke pipe assembly 100 and a waste heat recovery mechanism 200. The smoke pipe assembly 100 includes a smoke pipe exhaust pipe 110. The smoke pipe exhaust pipe 110 is used to communicate with the smoke exhaust port of the gas water heater 20. Specifically, the smoke pipe exhaust pipe 110 has a first end and a second end that are arranged opposite to each other. The first end is used to communicate with the smoke exhaust port of the gas water heater 20, and the second end is connected to the air.

[0040] See also Figure 2 , Figure 3 and Figure 4The waste heat recovery mechanism 200 includes a gravity heat pipe 210 and a heat exchange fin 220. The gravity heat pipe 210 includes an evaporation section 211 extending into the smoke exhaust pipe 110 and a condensation section 212 extending out of the smoke exhaust pipe 110. The gravity heat pipe 210 contains a heat exchange medium. The heat exchange fin 220 is connected to the condensation section 212. The evaporation section 211 can absorb the heat of the flue gas in the smoke exhaust pipe 110, so that the heat exchange medium in the evaporation section 211 evaporates and flows to the condensation section 212. The condensation section 212 is connected to the heat exchange fin 220 for heat exchange. Exemplarily, the condensation section 212 and the heat exchange fin 220 are made of copper, which can play a role in heat conduction and heat dissipation. The evaporation section 211 is made of stainless steel.

[0041] Working principle of gravity heat pipe 210: An appropriate amount of heat exchange medium is contained in gravity heat pipe 210. Before evaporation, the heat exchange medium is in evaporation section 211 of gravity heat pipe 210. When evaporation section 211 is heated, the heat exchange medium in evaporation section 211 will evaporate and vaporize, absorbing a large amount of latent heat of vaporization at the same time. Steam will flow rapidly to condensation section 212 under a small pressure difference. After cooling, steam will condense on the inner wall of condensation section 212 to form liquid, releasing a large amount of latent heat of vaporization during the process. The condensed heat exchange medium will flow to evaporation section 211 along the wall of gravity heat pipe 210 under the action of gravity. The above working process can be continuously circulated at high speed, and heat will continuously flow from evaporation section 211 of gravity heat pipe 210 to condensation section 212.

[0042] When the gas water heater 20 is burning, the high-temperature flue gas generated after the combustion of the gas will flow through the smoke exhaust port to the smoke exhaust pipe 110, and the smoke exhaust pipe 110 is provided with an evaporation section 211 of the gravity heat pipe 210. The heat exchange medium in the evaporation section 211 can absorb the heat of the high-temperature flue gas in the smoke exhaust pipe 110 and turn into a vapor state and can quickly flow to the condensation section 212. The condensation section 212 is connected to the heat exchange fins 220 for heat exchange, and the heat of the condensation section 212 can be transferred to the heat exchange fins 220, which can better achieve heat transfer. After heat exchange, the heat exchange fins 220 can dissipate heat into the room to heat the surrounding low-temperature air.

[0043] After the heat is dissipated to the room, the steam in the condensation section 212 is cooled and condensed, and then condensed into liquid. The condensed heat exchange medium flows along the wall of the gravity heat pipe 210 to the evaporation section 211 under the action of gravity. With continuous circulation, the indoor air will be heated by the heat exchange fins 220, and the excess heat in the flue gas can be recovered, thereby achieving the purpose of waste heat recovery, energy saving and emission reduction.

[0044] It should be noted that the present application does not limit the purpose of the flue gas waste heat recovery device 10. The heat recovered by the flue gas waste heat recovery device 10 can have a variety of uses, such as heating up the room in winter, building a disinfection cabinet in the kitchen, etc., and an insulated pipe with a fan can be installed at one end of the gravity heat pipe 210 where the heat exchange fins 220 are provided to conduct the heat to other places, etc.

[0045] By setting the gravity heat pipe 210 and the heat exchange fins 220, the evaporation section 211 can absorb the heat of the flue gas in the smoke exhaust pipe 110, so that the heat exchange medium in the evaporation section 211 evaporates and flows to the condensation section 212. The hot condensation section 212 is connected to the heat exchange fins 220 for heat exchange. The heat of the condensation section 212 can be transferred to the heat exchange fins 220, which can better realize the heat transfer. The heat exchange fins 220 after heat exchange can dissipate the heat to the room to heat the surrounding low-temperature air. After heat exchange, the steam in the condensation section 212 is cooled and condensed to form a liquid. The condensed heat exchange medium flows to the evaporation section 211 along the wall of the gravity heat pipe 210 under the action of gravity, and circulates continuously. The indoor air will be heated by the heat exchange fins 220, thereby realizing the recovery of excess heat in the flue gas, thereby achieving the purpose of waste heat recovery, energy saving and emission reduction.

[0046] The flue gas waste heat recovery device 10 according to an embodiment of the utility model will be described in detail below with reference to the accompanying drawings.

[0047] See also Figure 1 , Figure 2 , Figure 3 and Figure 4 According to some embodiments of the present application, optionally, the smoke pipe assembly 100 further includes a smoke pipe air inlet pipe 120, which is sleeved on the outside of the smoke pipe exhaust pipe 110. The central axis of the smoke pipe exhaust pipe 110 is inclined relative to the central axis of the smoke pipe air inlet pipe 120 toward the bottom of the smoke pipe air inlet pipe 120, and one end of the smoke pipe exhaust pipe 110 close to the smoke exhaust port is coaxially arranged with the smoke pipe exhaust pipe 110.

[0048] Specifically, the central axis of the smoke duct air inlet pipe 120 is parallel to the horizontal line. There is an angle between the central axis of the smoke duct air inlet pipe 120 and the central axis of the smoke duct exhaust pipe 110. It should be noted that: the present application does not limit the angle between the central axis of the smoke duct air inlet pipe 120 and the central axis of the smoke duct exhaust pipe 110, which can be set according to actual use requirements.

[0049] The smoke pipe air inlet pipe 120 is used to communicate with the air inlet of the gas water heater 20. Fresh air can enter the gas water heater 20 through the smoke pipe air inlet pipe 120 and the air inlet in sequence. The high temperature after combustion of the gas water heater 20 is discharged into the atmosphere through the smoke pipe exhaust pipe 110 and the smoke exhaust port in sequence. The smoke pipe air inlet pipe 120 and the smoke pipe exhaust pipe 110 are not connected to each other.

[0050] By tilting the central axis of the smoke duct exhaust pipe 110 relative to the central axis of the smoke duct air inlet pipe 120 toward the bottom of the smoke duct air inlet pipe 120, and arranging the end of the smoke duct exhaust pipe 110 close to the smoke exhaust port cocentrically with the smoke duct exhaust pipe 110, after the high-temperature flue gas exchanges heat with the evaporation section 211 of the gravity heat pipe 210, the condensed water generated by cooling can be directly discharged to the outside through the smoke duct exhaust pipe 110, thereby preventing the condensed water from flowing back into the gas water heater 20 and damaging the gas water heater 20.

[0051] The smoke pipe assembly 100 further includes an elbow 130, one end of which is connected to the smoke pipe exhaust pipe 110, and the other end of which is connected to the smoke exhaust port of the gas water heater 20. The smoke pipe air inlet pipe 120 is sleeved on the outside of the elbow 130. Specifically, one end of the elbow 130 has a first central axis. The other end of the elbow 130 has a second central axis, and the first central axis and the second central axis are perpendicular to each other.

[0052] See also Figure 2 , Figure 3 and Figure 4 According to some embodiments of the present application, the waste heat recovery mechanism 200 may further include a vacuum insulation pipe 300, which is sleeved on the gravity heat pipe 210, and the vacuum insulation pipe 300 is sleeved on a portion of the gravity heat pipe 210 between the smoke pipe inlet pipe 120 and the smoke pipe exhaust pipe 110. By arranging the vacuum insulation pipe 300 in the portion between the smoke pipe inlet pipe 120 and the smoke pipe exhaust pipe 110, the heat in the evaporation section 211 can be effectively prevented from flowing to the condensation section 212, thereby playing a role of insulation and preventing heat loss.

[0053] See also Figure 2 , Figure 3 and Figure 4 According to some embodiments of the present application, optionally, a first through hole for inserting the gravity heat pipe 210 is provided on both the smoke pipe air inlet pipe 120 and the smoke pipe exhaust pipe 110. In this embodiment, the vacuum insulation pipe 300 is located between the smoke pipe air inlet pipe 120 and the smoke pipe exhaust pipe 110 and the gravity heat pipe 210. There is a partial vacuum insulation pipe 300 between the smoke pipe air inlet pipe 120 and the smoke pipe exhaust pipe 110, and the vacuum insulation pipe 300 can play a role in insulation, preventing heat from being lost from the gap between the smoke pipe air inlet pipe 120 and the smoke pipe exhaust pipe 110.

[0054] See also Figure 2 , Figure 3 and Figure 4According to some embodiments of the present application, optionally, a second through hole for inserting the gravity heat pipe 210 is provided on the heat exchange fin 220, and the condensing section 212 is connected to the second through hole by interference fit. The heat of the condensing section 212 can be better transferred to the heat exchange fin 220 by the interference fit connection between the condensing section 212 and the second through hole.

[0055] See also Figure 2 , Figure 3 and Figure 4 According to some embodiments of the present application, optionally, the waste heat recovery mechanism 200 further includes a mounting positioning member 400 , and the gravity heat pipe 210 is sealed and connected to the smoke duct air inlet pipe 120 and the smoke duct exhaust pipe 110 through the mounting positioning member 400 .

[0056] Specifically, the mounting positioning member 400 includes a fixing portion 410 and a limiting boss 420 arranged on the fixing portion 410 . The fixing portion 410 is provided with a third through hole for inserting the vacuum insulation pipe 300 . The limiting boss 420 has a limiting surface 421 abutting against the outer wall of the smoke duct inlet pipe 120 .

[0057] The limiting boss 420 is connected to the upper end of the fixing portion 410. The fixing portion 410 is disposed around the outside of the vacuum insulation pipe 300. The limiting boss 420 can abut against the outer wall of the smoke pipe air inlet pipe 120, thereby limiting the vacuum insulation pipe 300. The outer contour of the limiting surface 421 is the same as the outer wall of the smoke pipe air inlet pipe 120.

[0058] The fixing part 410 is sealed and connected to the vacuum insulation pipe 300, which can effectively prevent moisture or air from leaking out of the gap between the vacuum insulation pipe 300 and the smoke pipe air inlet pipe 120 and the smoke pipe exhaust pipe 110, thereby affecting the heat transfer between the evaporation section 211 and the condensation section 212. The installation positioning member 400 is made of high temperature resistant rubber, which can play a sealing role.

[0059] See also Figure 2 , Figure 3 and Figure 4 According to some embodiments of the present application, the vacuum insulation pipe 300 is optionally connected to the third through hole by interference fit. The vacuum insulation pipe 300 is connected to the third through hole by interference fit, so that the connection strength between the vacuum insulation pipe 300 and the smoke pipe air inlet pipe 120 and the smoke pipe exhaust pipe 110 can be ensured.

[0060] See also Figure 2 , Figure 3 and Figure 4According to some embodiments of the present application, optionally, the gravity heat pipe 210 includes a plurality of gravity heat pipes 210, and the plurality of gravity heat pipes 210 are arranged at intervals along the axial direction of the smoke exhaust pipe 110. The heat exchange fins 220 include a plurality of heat exchange fins 220, and the plurality of heat exchange fins 220 are arranged at intervals along the axial direction of the gravity heat pipe 210. It should be understood that the present application does not limit the number of gravity heat pipes 210 and heat exchange fins 220, and can be set according to actual use requirements.

[0061] See also Figure 2 , Figure 3 and Figure 4 According to some embodiments of the present application, optionally, the gravity heat pipe 210 has a first end and a second end that are arranged opposite to each other, the first ends of the plurality of gravity heat pipes 210 are on the same horizontal plane, the evaporation section 211 is at the second end of the gravity heat pipe 210 of the gravity heat pipe 210, and the lengths of the plurality of gravity heat pipes 210 extending into the smoke pipe exhaust pipe 110 are the same. Specifically, since the central axis of the smoke pipe exhaust pipe 110 is inclined toward the bottom of the smoke pipe intake pipe 120 relative to the central axis of the smoke pipe intake pipe 120, the length of each gravity heat pipe 210 is different. In the direction away from the smoke exhaust port, the length of the gravity heat pipe 210 gradually increases to ensure that the gravity heat pipe 210 has sufficient heat exchange contact surface with the high-temperature flue gas, thereby improving the recovery rate of the flue gas waste heat.

[0062] The present application also provides a gas water heater 20, comprising the above-mentioned flue gas waste heat recovery device 10.

[0063] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0064] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be construed as limiting the scope of the patent application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent application shall be subject to the attached claims.

Claims

1. A flue gas waste heat recovery device, characterized in that: include: A smoke tube assembly (100), the smoke tube assembly (100) comprising a smoke tube exhaust pipe (110); A waste heat recovery mechanism (200), the waste heat recovery mechanism (200) comprising a gravity heat pipe (210) and a heat exchange fin (220), the gravity heat pipe (210) comprising an evaporation section (211) extending into the smoke exhaust pipe (110) and a condensation section (212) extending out of the smoke exhaust pipe (110), a heat exchange medium is contained in the gravity heat pipe (210), and the heat exchange fin (220) is connected to the condensation section (212).

2. The flue gas waste heat recovery device according to claim 1, characterized in that: The smoke pipe assembly (100) further comprises a smoke pipe air inlet pipe (120), wherein the smoke pipe air inlet pipe (120) is sleeved on the outside of the smoke pipe exhaust pipe (110), and the central axis of the smoke pipe exhaust pipe (110) is inclined relative to the central axis of the smoke pipe air inlet pipe (120) and toward the bottom of the smoke pipe air inlet pipe (120).

3. The flue gas waste heat recovery device according to claim 2, characterized in that: The smoke pipe air inlet pipe (120) and the smoke pipe exhaust pipe (110) are both provided with a first through hole for inserting the gravity heat pipe (210); And / or, the heat exchange fin (220) is provided with a second through hole for inserting the gravity heat pipe (210), and the condensing section (212) is connected to the second through hole by interference fit.

4. The flue gas waste heat recovery device according to claim 2, characterized in that: The waste heat recovery mechanism (200) further comprises a vacuum insulation pipe (300), wherein the vacuum insulation pipe (300) is sleeved on a portion of the gravity heat pipe (210) between the smoke pipe air inlet pipe (120) and the smoke pipe exhaust pipe (110).

5. The flue gas waste heat recovery device according to claim 4, characterized in that: The waste heat recovery mechanism (200) further comprises a mounting positioning member (400), and the gravity heat pipe (210) is sealedly connected to the smoke pipe air inlet pipe (120) and the smoke pipe exhaust pipe (110) via the mounting positioning member (400).

6. The flue gas waste heat recovery device according to claim 5, characterized in that: The mounting positioning member (400) comprises a fixing portion (410) and a limiting boss (420) arranged on the fixing portion (410); the fixing portion (410) is provided with a third through hole for inserting the vacuum insulation pipe (300); and the limiting boss (420) has a limiting surface (421) abutting against the outer side wall of the smoke pipe air inlet pipe (120).

7. The flue gas waste heat recovery device according to claim 6, characterized in that: The fixing portion (410) is sealed and connected to the vacuum insulation pipe (300) or the gravity heat pipe (210); And / or, the vacuum insulation tube (300) is connected to the third through hole by interference fit.

8. The flue gas waste heat recovery device according to claim 1, characterized in that: The gravity heat pipe (210) includes a plurality of gravity heat pipes (210), and the plurality of gravity heat pipes (210) are arranged at intervals along the axial direction of the smoke pipe exhaust pipe (110); And / or, the heat exchange fin (220) includes a plurality of heat exchange fins (220), and the plurality of heat exchange fins (220) are arranged at intervals along the axial direction of the gravity heat pipe (210).

9. The flue gas waste heat recovery device according to claim 1, characterized in that: The gravity heat pipe (210) has a first end and a second end that are arranged opposite to each other, the first ends of the plurality of gravity heat pipes (210) are on the same horizontal plane, the evaporation section (211) is located at the second end of the gravity heat pipe (210), and the lengths of the plurality of gravity heat pipes (210) extending into the smoke pipe exhaust pipe (110) are all the same.

10. A gas water heater, characterized in that: It comprises a flue gas waste heat recovery device (10) as claimed in any one of claims 1 to 9.

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