Gas water heater capable of recovering flue gas waste heat

Abstract

The utility model discloses a gas water heater for flue gas waste heat recovery, which relates to the technical field of gas water heaters, and comprises six water heater bodies and a heat exchanger, the heat exchanger is positioned on one side of the six water heater bodies, and the arc surfaces of the six water heater bodies are communicated with water inlet pipes. The upper surfaces of the six water heater bodies communicate with smoke outlet pipes, the other ends of the three water inlet pipes communicate with a discharging pipe, the upper surfaces of the six water heater bodies communicate with smoke outlet pipes, the other ends of the six smoke outlet pipes communicate with a smoke through pipe, the arc surface of the heat exchanger communicates with a water outlet pipe, and the other end of the water outlet pipe communicates with the discharging pipe. The effect that flue gas waste heat of gas water heating systems of six water heater bodies is recycled in a centralized mode is achieved, and the problems that the flue gas emission flow of a conventional water heater body hot water supply system is small, flue gas with the emission temperature being about 140 DEG C is difficult to recycle, and the use cost of the device is increased are solved.

Description

Technical Field

[0001] The utility model relates to the technical field of gas water heaters, in particular to a gas water heater with flue gas waste heat recovery. Background Technique

[0002] A gas water heater is a gas appliance that uses gas as fuel and heats water by combustion to prepare hot water. It mainly consists of a valve body assembly, a burner, a safety device, a flue, etc. The valve body assembly controls the entire working process of the water heater, which includes a water valve, a gas valve, a micro switch, an igniter, etc. When the water heater is installed, valves are installed on the water inlet pipe, the water extraction pipe, and the smoke outlet pipe.

[0003] The above-mentioned and existing related technologies often have the following defects: In a conventional gas water heater hot water supply system, the flue gas temperature is about 140°C, and this flue gas is directly discharged into the air through the smoke outlet pipe. For a single water heater, due to the small flue gas discharge flow rate and the inability to reuse the flue gas, the gas energy consumption is increased. Simply absorbing the flue gas of a single water heater through a heat exchanger not only makes it difficult to achieve the purpose of waste heat recovery but also increases the use cost.

[0004] Therefore, we propose a gas water heater with flue gas waste heat recovery. Content of the Utility Model

[0005] The purpose of the utility model is to provide a gas water heater with flue gas waste heat recovery to solve the problems raised in the above background technique.

[0006] To achieve the above purpose, the utility model provides the following technical solution: A gas water heater with flue gas waste heat recovery includes six water heater bodies and a heat exchanger. The heat exchanger is located on one side of the six water heater bodies. The arc surfaces of the six water heater bodies are all connected to a water inlet pipe. The other ends of three of the water inlet pipes are connected to a drain pipe. The upper surfaces of the six water heater bodies are all connected to a smoke outlet pipe. The other ends of the six smoke outlet pipes are connected to a smoke passing pipe. The arc surface of the heat exchanger is connected to a water outlet pipe, and the other end of the water outlet pipe is connected to the drain pipe. The heat exchanger arc surface is connected to a smoke inlet pipe at a position above the water outlet pipe, and the other end of the smoke inlet pipe is connected to the smoke passing pipe. The arc surface of the heat exchanger is connected to a water inlet pipe, and the heat exchanger arc surface is connected to a smoke exhaust pipe at a position below the water inlet pipe.

[0007] The effects achieved by the above components are as follows: The effect of centralized recovery and utilization of the flue gas waste heat of the gas hot water systems of the six water heater bodies is achieved, thereby avoiding as much as possible the problems that the flue gas discharge flow rate of the conventional water heater body hot water supply system is small and it is difficult to recover and utilize the flue gas with a discharge temperature of about 140°C, resulting in an increase in the use cost of the device.

[0008] Preferably, a circular ring is slidably connected to the arc surface of the water inlet pipe. One side of the circular ring is fixedly connected to a bottom plate. A driving rod is threadedly penetrated through the arc surface of the circular ring. The lower end of the driving rod is rotatably connected to a limiting plate, and the limiting plate is located above the water inlet pipe.

[0009] The effect achieved by the above components is that rotating the driving rod drives the limiting plate to position the bottom plate, and the bottom plate plays a role in supporting the flange and facilitating the quick disassembly and assembly during the maintenance of the heat exchanger by personnel.

[0010] Preferably, elastic ropes are fixedly connected to both sides of the limiting plate relative to the driving rod, and the other ends of the two elastic ropes are fixedly connected to the inner wall of the circular ring.

[0011] The effect achieved by the above components is that the movement of the limiting plate drives the elastic ropes to stretch and contract, and the elastic ropes achieve the effect of preventing the limiting plate from rotating as much as possible.

[0012] Preferably, a plurality of rubber strips are fixedly connected to the inner wall of the limiting plate, and the arc surfaces of the plurality of rubber strips are in contact with the water inlet pipe.

[0013] The effect achieved by the above components is that the limiting plate drives the rubber strips to fit and press against the arc surface of the water inlet pipe, and the rubber strips play a role in improving the limiting strength of the limiting plate.

[0014] Preferably, a through hole is formed in the inner wall of the bottom plate, and the through hole is located below the water inlet pipe.

[0015] The effect achieved by the above components is that when the flange is installed on the water inlet pipe with bolts, operations can be carried out on the blocked position through the through hole, and the through hole achieves the effect of improving the operation convenience of personnel.

[0016] Preferably, two U-shaped rods are fixedly connected to the arc surface of the circular ring, and both U-shaped rods are located on both sides of the driving rod.

[0017] The effect achieved by the above components is that moving the U-shaped rod drives the entire circular ring to move, and the U-shaped rod plays a role in better holding the circular ring.

[0018] Preferably, two support frames are fixedly connected to the arc surface of the heat exchanger. The cross-section of the support frame is in the shape of "F", and the arc surface of the U-shaped rod is slidably connected to the inner wall of the support frame.

[0019] The effect achieved by the above components is that the U-shaped rod drives the circular ring to move into the support frame, and the support frame achieves the effect of temporarily placing the circular ring to prevent loss.

[0020] Compared with the prior art, the beneficial effects of the present utility model are as follows: It achieves the effect of centrally recovering and utilizing the waste heat of the flue gas of six gas water heater bodies. By adopting the method of connecting multiple water heater bodies in parallel for centralized recovery of flue gas, there is a large space for waste heat utilization after the flue gas converges, thereby improving the hot water efficiency. By exchanging heat with the tap water in the water inlet pipe, the function of increasing the temperature of the water inlet pipe of the water heater body is realized, effectively reducing the gas consumption for the water heater body. After heat exchange, the temperature of the flue gas in the exhaust pipe is reduced to about 50 °C and discharged into the air through the heat exchanger. Calculated based on six 52 kW volume type water heater bodies, the flue gas flow rate is about 480 m³ / h, the temperature is 140 °C, and the pressure is 0.12 MPa. After exchanging heat with 10 m³ / h, which is the total water inlet volume of six water heater bodies, the outlet temperature of the flue gas is 50 °C, and the tap water temperature rises by 3 °C, making the overall hot water system efficiency of the device increase by about 10%. Moreover, the gas consumption of six water heaters is 33 m³ / h, and 3.3 m³ of gas can be saved per hour. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the overall structure of the present utility model;

[0022] Figure 2 It is a schematic diagram of the structure at the heat exchanger of the present utility model;

[0023] Figure 3 For the present utility model Figure 2 Schematic diagram of the partial structure;

[0024] Figure 4 It is a schematic diagram of the structure at the through hole of the present utility model;

[0025] Figure 5 It is a schematic diagram of the flow directions of the tap water and the flue gas system of the present utility model.

[0026] In the figure: 1. Water heater body; 2. Water inlet pipe; 3. Drain pipe; 4. Smoke outlet pipe; 5. Smoke through pipe; 6. Heat exchanger; 7. Water outlet pipe; 8. Smoke inlet pipe; 9. Water inlet pipe; 10. Exhaust pipe; 11. Ring; 12. Bottom plate; 13. Driving rod; 14. Limiting plate; 15. Elastic rope; 16. Rubber strip; 17. Through hole; 18. U-shaped rod; 19. Support frame. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0027] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0028] Please refer to Figures 1-5 For this utility model, a technical solution is provided: a gas water heater for recovering waste heat from flue gas, which includes six water heater bodies 1 and a heat exchanger 6. The heat exchanger 6 is located on one side of the six water heater bodies 1. The arc surfaces of the six water heater bodies 1 are all connected to a water inlet pipe 2. The other ends of three water inlet pipes 2 are connected to a discharge pipe 3. The upper surfaces of the six water heater bodies 1 are all connected to a smoke outlet pipe 4. The other ends of the six smoke outlet pipes 4 are connected to a smoke passage pipe 5. The arc surface of the heat exchanger 6 is connected to a water outlet pipe 7. The other end of the water outlet pipe 7 is connected to the discharge pipe 3. The position on the arc surface of the heat exchanger 6 above the water outlet pipe 7 is connected to a smoke inlet pipe 8. The other end of the smoke inlet pipe 8 is connected to the smoke passage pipe 5. The arc surface of the heat exchanger 6 is connected to a water inlet pipe 9. The position on the arc surface of the heat exchanger 6 below the water inlet pipe 9 is connected to a smoke exhaust pipe 10, achieving the effect of centrally recovering and utilizing the waste heat of the flue gas of the gas hot water systems of the six water heater bodies 1, thereby minimizing the problem that the flue gas discharge flow of the conventional water heater body 1 hot water supply system is small and it is difficult to recover and utilize the flue gas with a discharge temperature of about 140°C, which increases the use cost of the device.

[0029] As Figure 3 and Figure 4 shown, a circular ring 11 is slidably connected to the arc surface of the water inlet pipe 9. One side of the circular ring 11 is fixedly connected to a bottom plate 12. A driving rod 13 is threadedly penetrated through the arc surface of the circular ring 11. The lower end of the driving rod 13 is rotatably connected to a limiting plate 14. The limiting plate 14 is located above the water inlet pipe 9. Rotating the driving rod 13 drives the limiting plate 14 to position the bottom plate 12. The bottom plate 12 serves to support the flange and facilitate the quick disassembly and assembly during the maintenance of the heat exchanger 6 by personnel. Elastic ropes 15 are fixedly connected to the positions on both sides of the limiting plate 14 relative to the driving rod 13. The other ends of the two elastic ropes 15 are fixedly connected to the inner wall of the circular ring 11. The movement of the limiting plate 14 drives the elastic ropes 15 to stretch and contract. The elastic ropes 15 achieve the effect of preventing the limiting plate 14 from rotating as much as possible. A plurality of rubber strips 16 are fixedly connected to the inner wall of the limiting plate 14. The arc surfaces of the plurality of rubber strips 16 are all abutted against the water inlet pipe 9. The limiting plate 14 drives the rubber strips 16 to fit and press against the arc surface of the water inlet pipe 9. The rubber strips 16 serve to improve the limiting strength of the limiting plate 14.

[0030] As Figure 2 and Figure 3 and Figure 4As shown in the figure, a through hole 17 is provided on the inner wall of the bottom plate 12. The through hole 17 is located below the water inlet pipe 9. When the flange is installed on the water inlet pipe 9 with bolts, the occlusion position is operated through the through hole 17, and the through hole 17 achieves the effect of improving the convenience of personnel operation. Two U-shaped rods 18 are fixedly connected to the arc surface of the ring 11. Both of the two U-shaped rods 18 are located on both sides of the driving rod 13. Moving the U-shaped rod 18 drives the overall movement of the ring 11. The U-shaped rod 18 plays a role in better holding the ring 11. Two support frames 19 are fixedly connected to the arc surface of the heat exchanger 6. The cross-section of the support frame 19 is in the shape of "F". The arc surface of the U-shaped rod 18 is slidably connected to the inner wall of the support frame 19. The U-shaped rod 18 drives the ring 11 to move into the support frame 19, and the support frame 19 achieves the effect of temporarily placing the ring 11 to prevent loss.

[0031] Working principle: When it is necessary to centrally recover and utilize the flue gas of the six water heater bodies 1, tap water enters the heat exchanger 6 through the water inlet pipe 9, passes through the water outlet pipe 7 into the exhaust pipe 3 from the heat exchanger 6, and then is discharged into the water inlet pipes 2 of three of the water heater bodies 1 through the exhaust pipe 3. At this time, the other three water heater bodies 1 enter water through the water inlet pipe 2 through the normal water system. The water heater body 1 is heated by gas. After the six water heater bodies 1 are heated, the temperature of the tap water inside rises. The generated flue gas enters the smoke pipe 5 through the smoke outlet pipe 4 centrally, and then enters the heat exchanger 6 through the smoke inlet pipe 8. At this time, the flue gas contacts the tap water flowing in the heat exchanger 6. After actual measurement, calculated by six 52kW-capacity water heater bodies 1, the flue gas flow rate is about 480m3 / h, the temperature is 140°C, and the pressure is 0.12MPa. After exchanging heat with 10m3 / h, that is, the total water inlet of six water heater bodies 1, the flue gas at about 140°C exchanges heat with the tap water in the heat exchanger 6, so that the flue gas cools down to about 50°C in the heat exchanger 6 and is discharged through the exhaust pipe 10, while the tap water temperature rises by 3°C after exchanging heat with the high-temperature flue gas in the heat exchanger 6, so that the overall heating efficiency of the hot water system of the six water heater bodies 1 is increased by about 10%. The gas consumption of the six water heater bodies 1 is 33m3 / h. After heat exchange for three of the water heater bodies 1, the gas consumption can be saved by 3.3m3 per hour. Thus, while recovering and utilizing the waste heat of the high-temperature flue gas, the gas energy consumption cost of the water heater body 1 is reduced.

[0032] When the flange needs to be installed after the heat exchanger 6 is maintained and repaired, first move the U-shaped rod 18 away from the inner wall of the support frame 19, and the support frame 19 achieves the effect of temporarily preventing the loss of the ring 11. Then move the U-shaped rod 18 to drive the ring 11 to move to the arc surface of the water inlet pipe 9. The U-shaped rod 18 plays a role in better taking the ring 11. Then rotate the driving rod 13 through the ring 11 to the side close to the water inlet pipe 9. After the limiting plate 14 drives the rubber strip 16 to fit and press against the water inlet pipe 9 through the driving rod 13, the rubber strip 16 plays a role in improving the limiting strength of the limiting plate 14. At this time, the elastic rope 15 is in a stretched state through the movement of the limiting plate 14, and the elastic rope 15 achieves the effect of preventing the limiting plate 14 from rotating as much as possible. The ring 11 drives the bottom plate 12 to fit against the flange of the water inlet pipe 9 through the rotation of the driving rod 13. Then place another flange on the inner wall of the bottom plate 12 until it fits against the water inlet pipe 9 and install it with bolts. Above the bottom plate 12, it can be installed through the through hole 17, and the through hole 17 achieves the effect of improving the convenience of personnel operation. After installation, the ring 11 is located on the arc surface of the water inlet pipe 9, thus completing the support installation between the flange and the water inlet pipe 9.

[0033] It should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not expressly listed, or elements inherent to such process, method, article or device.

[0034] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principle and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A gas water heater for recovering waste heat from flue gas, comprising six water heater bodies (1) and a heat exchanger (6), characterized in that: The heat exchanger (6) is located on one side of the six water heater bodies (1); the arc surfaces of the six water heater bodies (1) are all connected to a water inlet pipe (2); the other ends of three of the water inlet pipes (2) are connected to an exhaust pipe (3); the upper surfaces of the six water heater bodies (1) are all connected to a smoke outlet pipe (4); the other ends of the six smoke outlet pipes (4) are connected to a smoke vent pipe (5); the arc surface of the heat exchanger (6) is connected to a water outlet pipe (7); the other end of the water outlet pipe (7) is connected to the exhaust pipe (3); the arc surface of the heat exchanger (6) is connected to a smoke inlet pipe (8) at a position above the water outlet pipe (7); the other end of the smoke inlet pipe (8) is connected to the smoke vent pipe (5); the arc surface of the heat exchanger (6) is connected to a water inlet pipe (9); the arc surface of the heat exchanger (6) is connected to a smoke exhaust pipe (10) at a position below the water inlet pipe (9).

2. A gas water heater with flue gas waste heat recovery according to claim 1, characterized in that: The circular arc surface of the water inlet pipe (9) is slidably connected to a circular ring (11), one side of the circular ring (11) is fixedly connected to a bottom plate (12), a driving rod (13) is threadedly penetrated through the circular arc surface of the circular ring (11), the lower end of the driving rod (13) is rotatably connected to a limiting plate (14), and the limiting plate (14) is located above the water inlet pipe (9).

3. A gas water heater with flue gas waste heat recovery according to claim 2, characterized in that: The position of the limiting plate (14) relative to both sides of the driving rod (13) is fixedly connected with elastic ropes (15), and the other ends of the two elastic ropes (15) are fixedly connected to the inner wall of the ring (11).

4. A gas water heater with flue gas waste heat recovery according to claim 3, characterized in that: A plurality of rubber strips (16) are fixedly connected to the inner wall of the limiting plate (14), and the arc surfaces of the plurality of rubber strips (16) are in contact with the water inlet pipe (9).

5. A gas water heater with flue gas waste heat recovery according to claim 2, characterized in that: A through hole (17) is provided on the inner wall of the bottom plate (12), and the through hole (17) is located below the water inlet pipe (9).

6. A gas water heater with flue gas waste heat recovery according to claim 2, characterized in that: Two U-shaped rods (18) are fixedly connected to the arc surface of the circular ring (11), and the two U-shaped rods (18) are located on both sides of the driving rod (13).

7. A gas water heater with flue gas waste heat recovery according to claim 6, characterized in that: The arc surface of the heat exchanger (6) is fixedly connected to two support frames (19), the cross section of the support frame (19) is "F" shaped, and the arc surface of the U-shaped rod (18) is slidably connected to the inner wall of the support frame (19).

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