Waste heat recovery equipment for gas-fired hot water boiler

Abstract

The utility model discloses gas-fired hot water boiler waste heat recovery equipment which comprises a bottom plate, a shell is arranged on one side of the upper portion of the bottom plate, a gas inlet cavity is formed in the upper end of the interior of the shell, a gas outlet cavity is formed in the bottom of the interior of the shell, a plurality of heat exchange pipes distributed at equal intervals are arranged between the gas inlet cavity and the gas outlet cavity, a gas inlet pipe is arranged on one side of the gas inlet cavity, and a gas outlet pipe is arranged on the other side of the gas inlet cavity. An air inlet pipe is arranged on one side of the air outlet cavity, an air outlet pipe is arranged on one side of the air outlet cavity, the air inlet pipe and the air outlet pipe both extend to the outer side of the shell, a scraper is connected to the outer side of the heat exchange pipe in a sleeving mode, a mounting base is arranged on one side of the upper portion of the shell, the upper portion of the mounting base is movably connected with a rotating disc, a threaded rod is inserted into the middle of the rotating disc, and the lower portion of the threaded rod is fixedly connected with the scraper. The heat energy recovery equipment is good in heat energy recovery efficiency, scale attached to the heat exchange pipes is convenient to clean, the phenomenon that the heat energy recovery efficiency of the recovery equipment is reduced is effectively avoided, and the practicability of the recovery equipment is improved.

Description

Technical Field

[0001] This utility model relates to the field of gas-fired hot water boiler technology, and in particular to a waste heat recovery device for gas-fired hot water boilers. Background Technology

[0002] A gas-fired water heater is a gas appliance that uses gas as fuel to heat water by transferring heat to cold water flowing through a heat exchanger. Because gas-fired water heaters generate a large amount of flue gas and waste heat energy during operation, waste heat recovery equipment is needed to assist in heat recovery. However, existing waste heat recovery equipment suffers from scale buildup on the heat exchange tubes after prolonged use, significantly reducing the condensation efficiency of the heat exchange tubes and thus lowering the overall efficiency of the waste heat recovery equipment. Therefore, we propose a waste heat recovery device for gas-fired water heaters. Utility Model Content

[0003] To address the aforementioned problems, this invention provides a waste heat recovery device for gas-fired hot water boilers. This invention solves the problem that in existing waste heat recovery devices for gas-fired hot water boilers, scale builds up on the heat exchange tubes after prolonged use, significantly reducing the condensation efficiency of the heat exchange tubes and thus lowering the overall waste heat recovery efficiency.

[0004] This utility model discloses a waste heat recovery device for a gas-fired hot water boiler, comprising a base plate, a shell on one side above the base plate, an air inlet chamber at the upper end of the shell, an air outlet chamber at the bottom of the shell, a plurality of heat exchange tubes arranged at equal intervals between the air inlet chamber and the air outlet chamber, an air inlet pipe on one side of the air inlet chamber, and an air outlet pipe on one side of the air outlet chamber, both extending to the outside of the shell, a scraper sleeved on the outside of the heat exchange tubes, a mounting base on one side above the shell, a turntable movably connected above the mounting base, a threaded rod inserted into the middle of the turntable, and a scraper fixedly connected below the threaded rod, a pump body on the side of the base plate away from the shell, the pump body input end connected to the shell through a first guide pipe, and the pump body output end provided with a second guide pipe.

[0005] In the above scheme, the second guide pipe is equipped with a first valve.

[0006] In the above scheme, a guide rod is inserted into the middle of the side of the housing away from the mounting base, and the lower part of the guide rod is fixedly connected to the scraper.

[0007] In the above scheme, a drain pipe is provided on one side of the lower part of the shell, the drain pipe is connected to the air outlet chamber, and a second valve is provided at one end of the drain pipe outside the shell.

[0008] In the above scheme, a liquid level display tube is provided on the side of the housing away from the air inlet pipe.

[0009] In the above scheme, the housing is provided with a manhole below the liquid level display tube.

[0010] In the above scheme, the outer side of the turntable is provided with anti-slip texture.

[0011] The advantages and beneficial effects of this utility model are as follows: This utility model provides a waste heat recovery device for a gas-fired hot water boiler. As the flue gas passes through the heat exchange tube 5, the heat inside the flue gas exchanges heat with the water inside the shell 2 through the heat exchange tube 5, thereby achieving the purpose of recovering waste heat from the flue gas. The pump body 12 extracts the water after heat exchange inside the shell 2 through the first guide pipe 13, and simultaneously, the water after heat exchange can be discharged through the second guide pipe 14. This recovery device has a simple structure, good heat recovery efficiency, and the scale adhering to the heat exchange tubes is easy to clean, effectively avoiding the phenomenon of reduced heat recovery efficiency and improving the practicality of the recovery device. Attached Figure Description

[0012] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0013] Figure 1 This is a schematic diagram of the structure of this utility model;

[0014] Figure 2 This is the front view of the present invention;

[0015] Figure 3 This is a cross-sectional view of the present invention.

[0016] In the diagram: 1. Base plate; 2. Shell; 3. Inlet chamber; 4. Outlet chamber

[0017] 5. Heat exchanger tube; 6. Inlet pipe; 7. Outlet pipe; 8. Scraper.

[0018] 9. Mounting base; 10. Turntable; 11. Threaded rod; 12. Pump body

[0019] 13. First guide pipe; 14. Second guide pipe; 15. First valve; 16. Guide rod

[0020] 17. Drain pipe; 18. Second valve; 19. Liquid level display tube; 20. Manhole

[0021] 21. Anti-slip texture. Detailed Implementation

[0022] The specific embodiments of this utility model will be further described below with reference to the accompanying drawings and examples. The following examples are only used to more clearly illustrate the technical solution of this utility model and should not be construed as limiting the scope of protection of this utility model.

[0023] like Figure 1-3 As shown, this utility model is a waste heat recovery device for a gas-fired hot water boiler, including a base plate 1, a shell 2 on one side of the base plate 1, an air inlet chamber 3 at the upper end of the shell 2, and an air outlet chamber 4 at the bottom of the shell 2. Multiple heat exchange tubes 5 are arranged at equal intervals between the air inlet chamber 3 and the air outlet chamber 4. An air inlet pipe 6 is provided on one side of the air inlet chamber 3, and an air outlet pipe 7 is provided on one side of the air outlet chamber 4. When the gas-fired hot water boiler is working, the flue gas generated can enter the air inlet chamber 3 through the air inlet pipe 6. Through the conduction of the heat exchange tubes 5, the flue gas can enter the air outlet chamber 4 and be discharged through the air outlet pipe 7. As the flue gas passes through the heat exchange tubes 5, the heat inside the flue gas exchanges heat with the water inside the shell 2 through the heat exchange tubes 5, thereby achieving the purpose of recovering waste heat from the flue gas. Both the air inlet pipe 6 and the air outlet pipe 7 extend to the outside of the shell 2. A scraper 8 is sleeved on the outside of the heat exchange tubes 5. A mounting base 9 is provided, which is movably connected to a turntable 10 at its top. A threaded rod 11 is inserted into the middle of the turntable 10, and the turntable 10 and the threaded rod 11 are threadedly connected. The threaded rod 11 is fixedly connected to a scraper 8 at its bottom. When the turntable 10 rotates, it pushes the scraper 8 to move vertically. During the movement of the scraper 8, it can clean the scale adhering to the heat exchange tube 5, thereby avoiding the phenomenon of reduced heat exchange efficiency due to scale adhering to the heat exchange tube 5. A pump body 12 is provided on the side of the base plate 1 away from the shell 2. The input end of the pump body 12 is connected to the shell 2 through a first guide pipe 13, and the output end of the pump body 12 is provided with a second guide pipe 14. When the pump body 12 is working, it draws water after heat exchange inside the shell 2 through the first guide pipe 13, and at the same time, it can discharge the water after heat exchange through the second guide pipe 14.

[0024] The second guide pipe 14 is provided with a first valve 15, which can control the opening and closing of the second guide pipe 14.

[0025] A guide rod 16 is inserted into the middle of the side of the housing 2 away from the mounting base 9. The guide rod 16 is fixedly connected to the scraper 8 below and is movably connected to the housing 2. Through the cooperation between the guide rod 16 and the housing 2, the movement stability of the scraper 8 is effectively improved.

[0026] A drain pipe 17 is provided on one side below the shell 2. The drain pipe 17 is connected to the air outlet chamber 4. A second valve 18 is provided at one end of the drain pipe 17 outside the shell 2. The condensate that appears after the flue gas inside the heat exchange tube 5 exchanges heat with the water can be discharged through the drain pipe 17. The second valve 18 can control the opening and closing of the drain pipe 17.

[0027] The housing 2 is provided with a liquid level display tube 19 on the side away from the air inlet pipe 6, through which the water level inside the housing 2 can be observed.

[0028] The housing 2 is located below the liquid level display tube 19 and has a manhole 20, through which the scale scraped off by the scraper 8 can be cleaned.

[0029] The turntable 10 is provided with anti-slip texture 21 on the outer side. The anti-slip texture 21 effectively increases the friction between the palm and the turntable 10, making it easier for the staff to rotate the turntable 10.

[0030] Specifically, in this utility model, the flue gas generated during the operation of the gas-fired water heater can enter the air inlet chamber 3 through the air inlet pipe 6. Through the conduction of the heat exchange pipe 5, the flue gas can enter the air outlet chamber 4 and be discharged through the air outlet pipe 7. When the flue gas passes through the heat exchange pipe 5, the heat inside the flue gas is exchanged with the water inside the shell 2 through the heat exchange pipe 5, thereby achieving the purpose of recovering the waste heat in the flue gas. When the turntable 10 rotates, the turntable 10 pushes the scraper 8 to move vertically. During the movement of the scraper 8, the scraper 8 can clean the scale attached to the heat exchange pipe 5, thereby avoiding the phenomenon of reduced heat exchange efficiency due to scale buildup in the heat exchange pipe 5. When the pump body 12 is working, the pump body draws the water after heat exchange inside the shell through the first guide pipe, and at the same time, it can discharge the water after heat exchange through the second guide pipe.

[0031] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A waste heat recovery device for a gas-fired hot water boiler, comprising a base plate (1), characterized in that, A shell (2) is provided on one side above the base plate (1). An air inlet chamber (3) is provided at the upper end of the shell (2), and an air outlet chamber (4) is provided at the bottom of the shell (2). Multiple heat exchange tubes (5) are arranged at equal intervals between the air inlet chamber (3) and the air outlet chamber (4). An air inlet pipe (6) is provided on one side of the air inlet chamber (3), and an air outlet pipe (7) is provided on one side of the air outlet chamber (4). Both the air inlet pipe (6) and the air outlet pipe (7) extend to the outside of the shell (2). A scraper is sleeved on the outside of the heat exchange tubes (5). (8) A mounting base (9) is provided on one side of the upper part of the housing (2). The upper part of the mounting base (9) is movably connected to the turntable (10). A threaded rod (11) is inserted into the middle of the turntable (10). The lower part of the threaded rod (11) is fixedly connected to the scraper (8). A pump body (12) is provided on the side of the bottom plate (1) away from the housing (2). The input end of the pump body (12) is connected to the housing (2) through the first guide pipe (13). The output end of the pump body (12) is provided with a second guide pipe (14).

2. The waste heat recovery equipment for a gas-fired hot water boiler according to claim 1, characterized in that, The second guide pipe (14) is equipped with a first valve (15).

3. The waste heat recovery equipment for a gas-fired hot water boiler according to claim 1, characterized in that, A guide rod (16) is inserted into the middle of the side of the housing (2) away from the mounting base (9), and the lower part of the guide rod (16) is fixedly connected to the scraper (8).

4. The waste heat recovery equipment for a gas-fired hot water boiler according to claim 1, characterized in that, A drain pipe (17) is provided on one side below the housing (2). The drain pipe (17) is connected to the air outlet (4). A second valve (18) is provided at one end of the drain pipe (17) outside the housing (2).

5. The waste heat recovery equipment for a gas-fired hot water boiler according to claim 1, characterized in that, The housing (2) is provided with a liquid level display tube (19) on the side away from the air inlet pipe (6).

6. The waste heat recovery equipment for a gas-fired hot water boiler according to claim 5, characterized in that, The housing (2) is provided with a manhole (20) located below the liquid level display tube (19).

7. The waste heat recovery equipment for a gas-fired hot water boiler according to claim 1, characterized in that, The turntable (10) has anti-slip texture (21) on its outer side.

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