Secondary heat exchange assembly of gas water heater

Abstract

A secondary heat exchange assembly of a gas water heater comprises a fan, a heat exchange air duct and a secondary heat exchanger, the air inlet end of the fan is communicated with a burner used for heating a main heat exchanger, the air outlet end of the fan is communicated with the heat exchange air duct, a smoke outlet communicated with the outside is formed in the heat exchange air duct, and the secondary heat exchanger is arranged in the heat exchange air duct. The secondary heat exchanger communicates with the main heat exchanger. According to the secondary heat exchange assembly of the gas water heater, smoke generated by combustion of the combustor is exhausted into the heat exchange air duct through the draught fan, then the smoke passes through the secondary heat exchanger, heat of the smoke can be transmitted to water in the secondary heat exchanger, and then the heat is transmitted to water in the main heat exchanger. Cold water in the main heat exchanger is preheated, so that the heat exchange speed is increased, the heat exchange effect of the main heat exchanger is improved, heat of smoke is fully utilized, energy waste is reduced, in addition, the temperature of the smoke is reduced after the smoke passes through the secondary heat exchanger, then the smoke is discharged to the outside through the smoke outlet, and rising of the external environment temperature is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of gas water heaters, in particular to a secondary heat exchange assembly of a gas water heater. Background Art

[0002] A gas water heater, also known as a gas water boiler, is a gas appliance 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. A gas water heater generally only has one heat exchange, the heat exchange speed is relatively slow, and the heat exchange effect is not very ideal. The temperature of the flue gas it emits is relatively high, and the heat of the flue gas is not utilized. This part of the heat can only be wasted, resulting in serious energy waste.

[0003] Therefore, further improvements are necessary. Utility Model Content

[0004] The purpose of the utility model is to provide a secondary heat exchange assembly for a gas water heater with a simple structure, good heat exchange effect, full utilization of flue gas heat, energy saving and strong practicality, so as to overcome the shortcomings of the prior art.

[0005] A secondary heat exchange assembly of a gas water heater designed for this purpose is characterized by comprising a fan, a heat exchange duct and a secondary heat exchanger, the air inlet end of the fan being connected to a burner for heating a main heat exchanger, the air outlet end of the fan being connected to the heat exchange duct, a smoke exhaust port connected to the outside being provided on the heat exchange duct, the secondary heat exchanger being arranged in the heat exchange duct, and the secondary heat exchanger being connected to the main heat exchanger.

[0006] The heat exchange air duct includes an air inlet channel, an air outlet channel and a middle channel. The air inlet channel is connected to the fan, the air outlet channel is connected to the smoke exhaust port, the air inlet channel and the air outlet channel are connected through the middle channel, and the middle channel is bent.

[0007] The width of the air outlet channel is greater than the width of the air inlet channel.

[0008] The secondary heat exchanger is arranged on the air outlet channel along the width direction of the air outlet channel.

[0009] The secondary heat exchanger is set close to the smoke exhaust port.

[0010] A first protruding air duct portion is provided on one side of the air inlet channel protruding toward the heat exchange air duct, and a second protruding air duct portion is provided on the other side of the air outlet channel protruding toward the heat exchange air duct.

[0011] A first guide slope is provided between the first protruding air duct portion and the middle channel, and the first protruding air duct portion is connected to the middle channel through the first guide slope. A second guide slope is provided between the second protruding air duct portion and the middle channel, and the second protruding air duct portion is connected to the middle channel through the second guide slope.

[0012] The secondary heat exchanger is provided with a connector for connecting to the main heat exchanger, and the heat exchange air duct is provided with a through hole, through which the connector extends out of the heat exchange air duct.

[0013] A filter is provided on the smoke exhaust port.

[0014] The heat exchange air duct comprises a first air duct shell and a second air duct shell connected to each other, and the first air duct shell and the second air duct shell cover each other to form the heat exchange air duct.

[0015] The utility model provides a secondary heat exchange assembly of a gas water heater. The flue gas generated by the combustion of the burner is discharged into the heat exchange air duct through the fan, and then the flue gas passes through the secondary heat exchanger. The heat of the flue gas is transferred to the water in the secondary heat exchanger, and then the heat is transferred to the water in the main heat exchanger, preheating the cold water in the main heat exchanger, thereby increasing the heat exchange speed, improving the heat exchange effect of the main heat exchanger, making full use of the heat of the flue gas, and reducing energy waste. In addition, the temperature of the flue gas will decrease after passing through the secondary heat exchanger, and then it will be discharged to the outside through the exhaust port, reducing the increase in the external ambient temperature. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic diagram of the overall structure of the secondary heat exchange assembly in one embodiment of the present utility model.

[0017] Figure 2 This is a schematic diagram of the overall structure of the secondary heat exchange assembly in another aspect of an embodiment of the present invention.

[0018] Figure 3 This is a schematic diagram of the overall structure of the heat exchange duct in one embodiment of the present invention.

[0019] Figure 4 This is a schematic diagram of the exploded structure of the secondary heat exchange assembly in one embodiment of the present utility model.

[0020] Figure 5 This is a schematic diagram of the overall structure of the secondary heat exchange assembly in the third position in one embodiment of the present utility model.

[0021] Figure 6 This is a schematic diagram of the exploded structure of the heat exchange duct in one embodiment of the present invention. DETAILED DESCRIPTION

[0022] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0023] See also Figures 1-6The secondary heat exchange assembly of the gas water heater includes a fan 1, a heat exchange duct 2 and a secondary heat exchanger 3. The secondary heat exchanger 3 is a condenser. The air inlet end 17 of the fan 1 is connected to the burner for heating the main heat exchanger. Specifically, a combustion chamber is provided inside the burner, and the combustion chamber is connected to the air inlet end 17 of the fan 1 through a smoke exhaust channel. The main heat exchanger is arranged above the burner. The above structure is a prior art and will not be described in detail here. The air outlet end 18 of the fan 1 is connected to the heat exchange duct 2. The heat exchange duct 2 is provided with a smoke exhaust port 4 connected to the outside world. The secondary heat exchanger 3 is arranged in the heat exchange duct 2, and the secondary heat exchanger 3 is connected to the main heat exchanger.

[0024] The heat exchange air duct 2 includes an air inlet channel 5, an air outlet channel 6 and an intermediate channel 7. The air inlet channel 5 is connected to the fan 1, and the air outlet channel 6 is connected to the smoke exhaust port 4. The air inlet channel 5 and the air outlet channel 6 are connected through the intermediate channel 7. The intermediate channel 7 is curved to reduce the flow velocity of the flue gas, thereby allowing the flue gas to fully exchange heat with the secondary heat exchanger 3.

[0025] The air inlet channel 5 is provided at one end of the heat exchange air duct 2 , and the air outlet channel 6 is provided at the other end of the heat exchange air duct 2 .

[0026] The width of the air outlet channel 6 is greater than that of the air inlet channel 5, and the secondary heat exchanger 3 is arranged on the air outlet channel 6 along the width direction of the air outlet channel 6; the contact area between the flue gas and the secondary heat exchanger 3 can be increased, thereby improving the heat exchange efficiency.

[0027] The secondary heat exchanger 3 is arranged close to the smoke exhaust port 4 .

[0028] The air inlet channel 5 is provided with a first protruding air duct portion 8 protruding toward one side of the heat exchange air duct 2, and the air outlet channel 6 is provided with a second protruding air duct portion 9 protruding toward the other side of the heat exchange air duct 2. The first protruding air duct portion 8 and the second protruding air duct portion 9 can respectively increase the cross-sectional area of ​​the air inlet channel 5 and the air outlet channel 6, thereby reducing the flue gas flow velocity, so that the flue gas can fully exchange heat with the secondary heat exchanger 3.

[0029] A first guide slope 10 is provided between the first protruding air duct portion 8 and the intermediate channel 7, and the first protruding air duct portion 8 is connected to the intermediate channel 7 through the first guide slope 10. A second guide slope 11 is provided between the second protruding air duct portion 9 and the intermediate channel 7, and the second protruding air duct portion 9 is connected to the intermediate channel 7 through the second guide slope 11; the first guide slope 10 and the second guide slope 11 guide the flow of smoke.

[0030] The secondary heat exchanger 3 is provided with a connector 12 for connecting to the main heat exchanger, and the heat exchange air duct 2 (the second air duct shell 16) is provided with a through hole 13. The connector 12 extends out of the heat exchange air duct 2 through the through hole 13 to connect to the main heat exchanger. The connector 12 is connected to the main heat exchanger through a pipeline.

[0031] The smoke exhaust port 4 is provided with a filter 14 , which can block dust and insects from the outside and prevent them from entering the heat exchange air duct 2 .

[0032] The heat exchange air duct 2 includes a first air duct shell 15 and a second air duct shell 16 welded to each other, and the first air duct shell 15 and the second air duct shell 16 cover each other to form the heat exchange air duct 2; the first protruding air duct portion 8 is arranged on the side of the first air duct shell 15, and the second protruding air duct portion 9 is arranged on the side of the second air duct shell 16.

[0033] The above is a preferred embodiment of the present invention, which illustrates and describes the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are merely illustrative of the principles of the present invention. Various changes and improvements may be made to the present invention without departing from the spirit and scope of the present invention. Such changes and improvements are intended to fall within the scope of the present invention. The scope of protection claimed in the present invention is defined by the appended claims and their equivalents.

Claims

1. A secondary heat exchange assembly for a gas water heater, characterized by: The invention comprises a fan (1), a heat exchange air duct (2) and a secondary heat exchanger (3); an air inlet end (17) of the fan (1) is connected to a burner for heating a main heat exchanger; an air outlet end (18) of the fan (1) is connected to the heat exchange air duct (2); a smoke exhaust port (4) connected to the outside is provided on the heat exchange air duct (2); the secondary heat exchanger (3) is provided in the heat exchange air duct (2); and the secondary heat exchanger (3) is connected to the main heat exchanger.

2. The secondary heat exchange assembly of the gas water heater according to claim 1, characterized in that: The heat exchange air duct (2) comprises an air inlet channel (5), an air outlet channel (6) and an intermediate channel (7); the air inlet channel (5) is connected to the fan (1); the air outlet channel (6) is connected to the smoke exhaust port (4); the air inlet channel (5) and the air outlet channel (6) are connected via the intermediate channel (7); and the intermediate channel (7) is arranged in a curved manner.

3. The secondary heat exchange assembly of the gas water heater according to claim 2, characterized in that: The width of the air outlet channel (6) is greater than the width of the air inlet channel (5).

4. The secondary heat exchange assembly of the gas water heater according to claim 3, characterized in that: The secondary heat exchanger (3) is arranged on the air outlet channel (6) along the width direction of the air outlet channel (6).

5. The secondary heat exchange assembly of the gas water heater according to claim 4, characterized in that: The secondary heat exchanger (3) is arranged close to the smoke exhaust port (4).

6. The secondary heat exchange assembly of the gas water heater according to claim 3, characterized in that: The air inlet channel (5) is provided with a first protruding air channel portion (8) protruding toward one side of the heat exchange air channel (2), and the air outlet channel (6) is provided with a second protruding air channel portion (9) protruding toward the other side of the heat exchange air channel (2).

7. The secondary heat exchange assembly of the gas water heater according to claim 6, characterized in that: A first flow guiding oblique portion (10) is provided between the first protruding air duct portion (8) and the intermediate channel (7), and the first protruding air duct portion (8) is connected to the intermediate channel (7) via the first flow guiding oblique portion (10); a second flow guiding oblique portion (11) is provided between the second protruding air duct portion (9) and the intermediate channel (7), and the second protruding air duct portion (9) is connected to the intermediate channel (7) via the second flow guiding oblique portion (11).

8. The secondary heat exchange assembly of the gas water heater according to claim 1, characterized in that: The secondary heat exchanger (3) is provided with a connector (12) for connecting to the main heat exchanger, the heat exchange air duct (2) is provided with a through hole (13), and the connector (12) extends out of the heat exchange air duct (2) through the through hole (13).

9. The secondary heat exchange assembly of the gas water heater according to claim 1, characterized in that: A filter screen (14) is provided on the smoke exhaust port (4).

10. The secondary heat exchange assembly of the gas water heater according to claim 1, characterized in that: The heat exchange air duct (2) comprises a first air duct shell (15) and a second air duct shell (16) which are connected to each other. The first air duct shell (15) and the second air duct shell (16) cover each other to form the heat exchange air duct (2).

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