Condensation heat exchanger

Abstract

The utility model belongs to the technical field of heat exchange equipment, and particularly relates to a condensation heat exchanger which comprises a shell with a heat exchange cavity, a smoke outlet and a smoke inlet are formed in the top and the bottom of the shell respectively, a smoke guide partition plate is arranged in the heat exchange cavity, and a heat exchange channel is formed between the smoke guide partition plate and the heat exchange cavity. The head end and the tail end of the heat exchange channel are communicated with the smoke inlet and the smoke outlet respectively, a plurality of heat absorption pipes are horizontally and transversely arranged in the heat exchange channel, the ends of the adjacent heat absorption pipes are communicated through a water passing channel to form a water flow channel of a snake-shaped structure, and a water inlet port and a water outlet port which are communicated with the head end and the tail end of the water flow channel respectively are formed in the shell. The heat exchange channel with a long smoke flowing path is formed in the heat exchange cavity through the smoke guide partition plate, and the heat exchange channel is of the S-shaped structure in the horizontal longitudinal direction, so that smoke can flow up and down along the heat exchange channel, the flowing speed of the smoke is effectively reduced, and it is guaranteed that the smoke can conduct sufficient heat exchange with the heat absorption pipe.

Description

Technical fields:

[0001] This utility model belongs to the technical field of heat exchange equipment, and specifically refers to a condensing heat exchanger. Background technology:

[0002] Gas-fired wall-hung boilers are typically equipped with combustion chambers, heat exchangers, and other related devices. The combustion chamber burns gas to generate a large amount of heat, which is then transferred to the cold water flowing through the heat exchanger via the inlet pipe. This raises the temperature of the cold water, forming hot water that is discharged from the outlet pipe. The high-temperature flue gas generated by combustion also passes through a secondary condensing heat exchanger, which recovers the heat from the flue gas to preheat the hot water flow, effectively improving the heat exchange rate of the gas-fired wall-hung boiler.

[0003] Most existing secondary condensing heat exchangers simply place heat-absorbing tubes directly in the flue gas exhaust channel. Due to the short flue gas channel and the fast flue gas flow rate, the heat in the flue gas cannot be effectively absorbed by the heat-absorbing tubes. Summary of the Invention:

[0004] The purpose of this invention is to provide a condensing heat exchanger that forms a long heat exchange channel for flue gas flow in the heat exchange chamber by means of a flue gas baffle. The heat exchange channel has a serpentine structure along the horizontal longitudinal direction, so that the flue gas can flow up and down along the heat exchange channel, effectively slowing down the flow rate of the flue gas and ensuring that the flue gas can have sufficient heat exchange with the heat absorption tube.

[0005] This utility model is implemented as follows:

[0006] A condensing heat exchanger includes a shell with a heat exchange chamber. The top and bottom of the shell are respectively provided with a flue gas outlet and a flue gas inlet communicating with the heat exchange chamber. A smoke guide baffle is provided in the heat exchange chamber, and a heat exchange channel with the smoke guide baffle and the heat exchange chamber is formed in a serpentine structure distributed horizontally. The first and last ends of the heat exchange channel are respectively connected to the flue gas inlet and the flue gas outlet. A plurality of heat absorption tubes are arranged horizontally in the heat exchange channel. The ends of adjacent heat absorption tubes are connected through a water passage to form a serpentine water flow channel. The shell is provided with an inlet port and an outlet port respectively connected to the first and last ends of the water flow channel.

[0007] In the aforementioned condensing heat exchanger, the flue gas baffle includes a flue gas baffle body that separates the upper and lower heat exchange chambers, an upper baffle body that is sealed and fixed on the upper end of the flue gas baffle body, and a lower baffle body that is sealed and fixed on the lower end of the inner bottom surface of the heat exchange chamber. The flue gas inlet is located below the front end of the flue gas baffle body, and a flue gas vent is provided at the rear end of the flue gas baffle body for flue gas to flow from the flue gas inlet to the flue gas outlet. The lower baffle body is located between the flue gas inlet and the upper baffle body. There are flue gas gaps for flue gas to pass through between the lower end of the upper baffle body and the inner bottom surface of the heat exchange chamber, and between the upper end of the lower baffle body and the flue gas baffle body.

[0008] In the aforementioned condensing heat exchanger, the smoke guide plate is inclined downwards along the horizontal direction, and the front end of the smoke guide plate is higher than the rear end of the smoke guide plate.

[0009] In the aforementioned condensing heat exchanger, the upper partition plate is inclined backward vertically, and the upper end of the upper partition plate is in front of the lower end of the upper partition plate.

[0010] In the aforementioned condensing heat exchanger, the flue gas inlet includes a flue gas groove arranged laterally and a plurality of flue gas holes spaced laterally. The flue gas groove is located on one side of the flue gas outlet, and the flue gas holes are located on the side of the flue gas groove closer to the flue gas outlet.

[0011] In the aforementioned condensing heat exchanger, the heat absorption tubes are corrugated tubes arranged in the heat exchange channel. The ends of two adjacent heat absorption tubes in the same row are connected by a bend, and the inner hole of the bend serves as the water passage. The heat absorption tubes in two adjacent rows are staggered left and right.

[0012] In the aforementioned condensing heat exchanger, the inner bottom surface of the heat exchange chamber is an inclined surface structure with a lowest point, and a drain connector communicating with the outside is provided at its lowest point.

[0013] The outstanding advantages of this utility model compared to the prior art are:

[0014] This utility model has a simple structure, reasonable design, and high heat exchange efficiency. It forms a heat exchange channel with a long flue gas flow path in the heat exchange chamber by means of a flue gas baffle. The heat exchange channel has a serpentine structure along the horizontal longitudinal direction, so that the flue gas can flow up and down along the heat exchange channel, effectively slowing down the flow rate of the flue gas and ensuring that the flue gas can have sufficient heat exchange with the heat absorption tube. Attached image description:

[0015] Figure 1 This is a three-dimensional view of the entire utility model;

[0016] Figure 2 This is an overall sectional view of the present invention.

[0017] In the diagram: 1. Shell; 2. Flue gas outlet; 3. Flue gas inlet; 4. Heat absorption tube; 5. Water inlet port; 6. Water outlet port; 7. Smoke guide plate; 8. Upper partition plate; 9. Lower partition plate; 10. Smoke vent; 11. Smoke vent; 12. Bend; 13. Drainage connector. Detailed implementation method:

[0018] The present invention will be further described below with reference to specific embodiments. See also: Figure 1 —2:

[0019] A condensing heat exchanger includes a shell 1 with a heat exchange chamber. The top and bottom of the shell 1 are respectively provided with a flue gas outlet 2 and a flue gas inlet 3 communicating with the heat exchange chamber. A smoke guide baffle is provided in the heat exchange chamber, and a heat exchange channel with the smoke guide baffle and the heat exchange chamber is formed in a serpentine structure distributed horizontally. The first and last ends of the heat exchange channel are respectively connected to the flue gas inlet 3 and the flue gas outlet 2. A plurality of heat absorption tubes 4 are arranged horizontally in the heat exchange channel. The ends of adjacent heat absorption tubes 4 are connected through a water passage to form a serpentine water flow channel. The shell 1 is provided with a water inlet port 5 and a water outlet port 6 respectively connected to the first and last ends of the water flow channel.

[0020] This utility model has a simple structure, reasonable design and high heat exchange efficiency. With the help of the smoke guide baffle, a heat exchange channel with a long flue gas flow path is formed in the heat exchange chamber. The heat exchange channel has a serpentine structure along the horizontal longitudinal direction, so that the flue gas can flow up and down along the heat exchange channel, effectively slowing down the flow rate of the flue gas and ensuring that the flue gas can have sufficient heat exchange with the heat absorption tube 4.

[0021] In this embodiment, the smoke guide baffle can be formed in the heat exchange chamber by directly using a serpentine baffle to form the heat exchange channel. In this embodiment, the specific structure of the smoke guide baffle is as follows: the smoke guide baffle includes a smoke guide plate body 7 that separates the heat exchange chamber, an upper partition plate body 8 that is sealed and fixed on the upper end of the smoke guide plate body 7, and a lower partition plate body 9 that is sealed and fixed on the bottom surface of the heat exchange chamber. The flue gas inlet 3 is located below the front end of the smoke guide plate body 7, and the rear end of the smoke guide plate body 7 is provided with a smoke outlet for the flue gas to flow from the flue gas inlet 3 to the flue gas outlet 2.

[0022] In this embodiment, two or more upper partition plates 8 and lower partition plates 9 can be provided, and they are staggered to form a serpentine structure with many bends and valleys. In this embodiment, based on the actual heat exchange efficiency and economic benefits between the flue gas and the heat exchange tube, only one upper partition plate 8 and one lower partition plate 9 are provided. The lower partition plate 9 is located between the flue gas inlet 3 and the upper partition plate 8. There are flue gas gaps between the lower end of the upper partition plate 8 and the inner bottom surface of the heat exchange chamber, and between the upper end of the lower partition plate 9 and the smoke guide plate 7, for the flue gas to pass through.

[0023] In order to make the flue gas flow downward as a whole during the flow of the heat exchange channel, so as to further slow down the flow rate of the flue gas, the smoke guide plate 7 is inclined downward along the horizontal, and the front end of the smoke guide plate 7 is higher than the rear end of the smoke guide plate 7.

[0024] Correspondingly, in order to effectively guide the flue gas flow from the peak position of the heat exchange channel bend to the valley position of the heat exchange channel bend, and to avoid the flue gas sinking to the valley position due to being squeezed at the peak position of the heat exchange channel bend, the upper partition plate 8 is inclined backward vertically, and the upper end of the upper partition plate 8 is in front of the lower end of the upper partition plate 8.

[0025] To reduce the flow rate of the flue gas, the flue gas inlet includes a transversely arranged flue gas channel 10 and a plurality of transversely spaced flue gas holes 11. The flue gas channel 10 is located on one side of the flue gas outlet 2, and the flue gas holes 11 are located on the side of the flue gas channel 10 closest to the flue gas outlet 2. That is, a portion of the flue gas flows to the flue gas outlet 2 through the flue gas holes 11, which have a smaller diameter than the flue gas channel 10, and its flow rate is relatively fast. The remaining flue gas flows to the flue gas outlet 2 through the flue gas channel 10, which has a larger diameter, and its flow rate is relatively slow. The two flue gas flow rates interfere with each other, causing the flue gas to become turbulent inside the flue gas outlet 2, thereby significantly slowing down the flow rate of the flue gas exiting the flue gas outlet 2.

[0026] In order to enable the heat absorption tube 4 to effectively exchange heat with the flue gas, the heat absorption tube 4 is a corrugated tube and is arranged in the heat exchange channel. The ends of two adjacent heat absorption tubes 4 in the same row are connected by a bend 12, and the inner hole of the bend 12 is the water passage. The heat absorption tubes 4 in the two adjacent rows are staggered.

[0027] In addition, in order to quickly collect and discharge condensate, the inner bottom surface of the heat exchange chamber is an inclined surface structure with a lowest point, and a drain connector 13 communicating with the outside is provided at its lowest point.

[0028] The above embodiments are only one of the preferred embodiments of this utility model and are not intended to limit the scope of implementation of this utility model. Therefore, all equivalent changes made in accordance with the shape, structure and principle of this utility model should be covered within the protection scope of this utility model.

Claims

1. A condensing heat exchanger, characterized in that: The shell (1) includes a heat exchange chamber. The top and bottom of the shell (1) are respectively provided with a flue gas outlet (2) and a flue gas inlet (3) communicating with the heat exchange chamber. A smoke guide baffle is provided in the heat exchange chamber, and a heat exchange channel with the smoke guide baffle and the heat exchange chamber is formed in a serpentine structure along the horizontal longitudinal direction. The first and last ends of the heat exchange channel are respectively connected to the flue gas inlet (3) and the flue gas outlet (2). Several heat absorption tubes (4) are arranged in the heat exchange channel along the horizontal transverse direction. The ends of adjacent heat absorption tubes (4) are connected through a water passage to form a serpentine water flow channel. The shell (1) is provided with a water inlet port (5) and a water outlet port (6) respectively connected to the first and last ends of the water flow channel. The smoke guide plate includes a smoke guide plate (7) that separates the upper and lower heat exchange chambers, an upper partition plate (8) that is sealed and fixed on the upper end of the smoke guide plate (7), and a lower partition plate (9) that is sealed and fixed on the lower end of the heat exchange chamber. The flue gas inlet (3) is located below the front end of the smoke guide plate (7). The rear end of the smoke guide plate (7) is provided with a flue gas inlet for flue gas to flow from the flue gas inlet (3) to the flue gas outlet (2). The lower partition plate (9) is located between the flue gas inlet (3) and the upper partition plate (8). There are flue gas gaps between the lower end of the upper partition plate (8) and the inner bottom surface of the heat exchange chamber, and between the upper end of the lower partition plate (9) and the smoke guide plate (7) for flue gas to pass through.

2. A condensing heat exchanger according to claim 1, characterized in that: The smoke guide plate (7) is inclined downward along the horizontal, and the front end of the smoke guide plate (7) is higher than the rear end of the smoke guide plate (7).

3. A condensing heat exchanger according to claim 1, characterized in that: The upper partition plate (8) is inclined backward along the vertical direction, and the upper end of the upper partition plate (8) is in front of the lower end of the upper partition plate (8).

4. A condensing heat exchanger according to claim 1, characterized in that: The smoke vent includes a smoke vent slot (10) arranged in the horizontal direction and a number of smoke vent holes (11) distributed at intervals in the horizontal direction. The smoke vent slot (10) is located on one side of the flue gas outlet (2), and the smoke vent holes (11) are located on the side of the smoke vent slot (10) close to the flue gas outlet (2).

5. A condensing heat exchanger according to claim 1, characterized in that: The heat absorption tube (4) is a corrugated tube and is arranged in the heat exchange channel. The ends of two adjacent heat absorption tubes (4) in the same row are connected by a bend (12), and the inner hole of the bend (12) is the water passage. The heat absorption tubes (4) in the upper and lower adjacent rows are staggered.

6. A condensing heat exchanger according to claim 1, characterized in that: The inner bottom surface of the heat exchange chamber is an inclined surface structure with a lowest point, and a drain connector (13) communicating with the outside is provided at its lowest point.

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