Flue gas heat exchange device of gas water heater

Abstract

A smoke heat exchange device of a gas water heater comprises a shell, a water heating device, a water inlet pipe and a water outlet pipe, the water heating device comprises a combustor, a heat exchanger and a smoke collecting hood, the smoke collecting hood is provided with a first smoke outlet and a second smoke outlet, and the gas water heater further comprises the smoke heat exchange device and a drainage structure. The smoke heat exchange device is arranged in the shell and located between the water inlet pipe and the water heating device, high-temperature smoke discharged by the water heating device partially enters the smoke heat exchange device and preheats cold water, the drainage structure comprises a drainage valve, and the drainage valve comprises a valve deck, a valve shell and a valve element. The utility model provides a flue gas heat exchange device of a gas water heater, which adopts the flue gas heat exchange device to carry out secondary utilization on high-temperature flue gas, reduces the loss of heat energy generated by a combustor and improves the utilization rate of gas.

Description

Technical Field

[0001] The utility model belongs to the technical field of gas water heaters, and particularly relates to a flue gas heat exchange device for a gas water heater. Background Art

[0002] With the continuous development of society, water heaters have become one of the indispensable household products in our current life. They are divided into gas water heaters and electric water heaters. Gas water heaters use gas as energy and heat through combustion. The heat of gas combustion is transferred to the cold water flowing through the heat exchanger through the heat exchanger to achieve the purpose of preparing hot water.

[0003] Conventional gas water heaters generally consist of burners, heat exchangers, smoke hoods and other components. The burner burns gas to heat the water flowing through the heat exchanger, and the high-temperature flue gas generated during combustion is discharged into the external environment through the smoke hood. The problem is that in the gas water heater with the above structure, the flue gas generated by the burner burning gas still maintains a relatively high temperature after completing one heat exchange treatment, and the flue gas contains water vapor with a high heat energy content. If the flue gas is discharged directly into the external environment, a large amount of heat energy generated by the burner will be lost and wasted, resulting in poor gas utilization, which is not conducive to energy saving.

[0004] Therefore, further improvement is needed. Utility Model Content

[0005] The purpose of the present invention is to overcome at least one of the deficiencies of the above-mentioned prior art and to provide a flue gas heat exchange device for a gas water heater, which uses a flue gas heat exchange device to recycle high-temperature flue gas, reduce the loss of heat energy generated by the burner, and improve the utilization rate of the gas.

[0006] In order to achieve the above-mentioned purpose, the technical solution provided by the embodiment of the present utility model is:

[0007] A flue gas heat exchange device of a gas water heater comprises a shell, a water heating device arranged in the shell and heating cold water by burning gas, a water inlet pipe connecting an external water source and the water heating device and inputting cold water, and a water outlet pipe connecting the water heating device and the external environment and outputting hot water, the water heating device comprises a burner, a heat exchanger, and a smoke collecting hood arranged in sequence from bottom to top, the smoke collecting hood is provided with a first smoke exhaust port for discharging high-temperature smoke to the external environment, and a second smoke exhaust port for discharging high-temperature smoke to the smoke heat exchange device, the first smoke exhaust port is arranged at the top of the smoke collecting hood and extends out of the shell, the second smoke exhaust port is arranged at the side of the smoke collecting hood and connected to the smoke heat exchange device, the gas water heater also comprises The invention relates to a flue gas heat exchange device and a drainage structure for discharging condensed water to the external environment. The flue gas heat exchange device is arranged in a shell and is located between a water inlet pipe and a water heating device. The high-temperature flue gas discharged by the water heating device partially enters the flue gas heat exchange device and preheats the cold water. The drainage structure includes a drain valve. The drain valve includes a valve cover, a valve shell, and a valve core. The valve cover and the valve shell cover each other and form a drainage cavity. The valve core is arranged in the drainage cavity. The buoyancy of the condensed water in the drainage cavity is greater than the weight of the valve core. The valve core is away from the water inlet end of the water valve outlet to open the water valve outlet. The buoyancy of the condensed water in the drainage cavity is less than the weight of the valve core. The valve core is against the water inlet end of the water valve outlet to close the water valve outlet.

[0008] The flue gas heat exchange device includes a heat exchange box, a hot water exchange pipe arranged on the heat exchange box and used to transport cold water, a water inlet joint connecting the water inlet pipe and the hot water exchange pipe and inputting cold water in the direction of the hot water exchange pipe, a water outlet joint connecting the hot water exchange pipe and the water heating device and outputting preheated water to the water heating device, and a drain joint connecting the heat exchange box and the external environment and used to discharge condensed water in the heat exchange box. The hot water exchange pipe is arranged in the heat exchange box, and the water inlet joint, water outlet joint, and drain joint are all arranged at the bottom of the heat exchange box.

[0009] The heat exchange box body is provided with a heat exchange cavity, a smoke inlet connecting the water heating device and the heat exchange cavity and used for high-temperature flue gas to enter the heat exchange cavity, and a smoke outlet connecting the heat exchange cavity and the external environment and used for high-temperature flue gas to discharge the heat exchange cavity. The water exchange water pipe is arranged in the heat exchange cavity, the smoke inlet is arranged on the side of the heat exchange box body, and the smoke outlet is arranged on the top of the heat exchange box body.

[0010] The heat exchange box body is also provided with a first joint mounting hole for installing a water inlet joint, a second joint mounting hole for installing a water outlet joint, and a third joint mounting hole for installing a drain joint. The first joint mounting hole, the second joint mounting hole, and the third joint mounting hole are all located on the bottom surface of the heat exchange box body.

[0011] The heat exchange water pipe is spirally shaped and evenly arranged in the heat exchange box. The water inlet end of the heat exchange water pipe extends toward the bottom of the heat exchange box and is connected to the water inlet joint. The water outlet end of the heat exchange water pipe extends toward the bottom of the heat exchange box and is connected to the water outlet joint.

[0012] One end of the drainage structure is connected to the drainage joint, and the other end thereof is connected to the external environment. The drainage structure also includes a drainage pipe. The drainage valve is provided with a water valve inlet and a water valve outlet. The drainage pipe is arranged between the drainage joint and the drainage valve and is respectively connected to the drainage joint and the water valve inlet. The water valve outlet extends out of the shell and is connected to the external environment.

[0013] The drain valve further includes a monitoring component, which is arranged on the valve cover and / or the valve housing, and a monitoring end of the monitoring component extends into the drain cavity to monitor the capacity of condensed water in the drain cavity.

[0014] The beneficial effects of the utility model are as follows:

[0015] The utility model provides a flue gas heat exchange device in the gas water heater, so that part of the high-temperature flue gas discharged from the water heating device enters the flue gas heat exchange device. The flue gas heat exchange device recycles the flue gas generated by the water heating device and preheats the cold water, thereby reducing the loss of heat energy generated by the water heating device, improving the utilization rate of the gas by the gas water heater, and being conducive to saving energy.

[0016] In addition, the gas water heater uses a flue gas heat exchange device to preheat the cold water, which improves the heat exchange efficiency of the combustion water heater for cold water and improves the heating efficiency of the combustion water heater to a certain extent. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a rear view of a gas water heater according to an embodiment of the present invention.

[0018] Figure 2 This is a structural diagram of a flue gas heat exchange device according to an embodiment of the present invention.

[0019] Figure 3 This is a cross-sectional view of a flue gas heat exchange device according to one embodiment of the present invention.

[0020] Figure 4 This is an exploded view of a heat exchange box according to an embodiment of the present invention.

[0021] Figure 5 This is an exploded view of a heat exchange box according to an embodiment of the present invention.

[0022] Figure 6 This is an exploded view of the drainage structure of one embodiment of the present utility model.

[0023] Figure 7This is an exploded view of the drainage structure of one embodiment of the present utility model.

[0024] Figure 8 This is a schematic diagram of the flue gas flow of a flue gas heat exchange device according to one embodiment of the present invention.

[0025] Figure 9 This is a schematic diagram of the flow of condensed water when the drain valve of the flue gas heat exchange device is closed in one embodiment of the present utility model.

[0026] Figure 10 This is a schematic diagram of the flow of condensed water when the drain valve of the flue gas heat exchange device is opened in one embodiment of the utility model. DETAILED DESCRIPTION

[0027] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in combination with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments.

[0028] See also Figure 1-10The flue gas heat exchange device of the gas water heater includes a shell 1, a water heating device, a water inlet pipe 2, a water outlet pipe 3, a flue gas heat exchange device 4 and a drainage structure. The water heating device includes a burner 501, a heat exchanger 502, and a smoke hood 503 arranged in sequence from bottom to top and arranged in the shell 1. The smoke hood 503 is provided with a first smoke exhaust port 5031 and a second smoke exhaust port 5032. The first smoke exhaust port 5031 is arranged at the top of the smoke hood 503 and extends out of the shell 1. The second smoke exhaust port 5032 is arranged at the side of the smoke hood 503 and is connected to the flue gas heat exchange device 4. The burner 501 heats the water flowing through the heat exchanger 502 by burning gas, and a part of the high-temperature flue gas generated during the combustion is discharged through the first smoke exhaust port 5031 To the external environment, another part of the high-temperature flue gas is discharged into the flue gas heat exchange device 4 through the second smoke exhaust port 5032. The water inlet pipe 2 is arranged in the shell 1, one end of which is connected to the external water source, and the other end is connected to the flue gas heat exchange device 4 to realize the delivery of cold water to the flue gas heat exchange device 4. The water outlet pipe 3 is arranged in the shell 1, one end of which is connected to the external water end, and the other end is connected to the water heating device to realize the output of hot water to the external environment. The flue gas heat exchange device 4 includes a heat exchange box 401, a hot water exchange pipe 402, a water inlet joint 403, a water outlet joint 404, and a drain joint 405, which is arranged in the shell 1 and is located between the water inlet pipe 2 and the water heating device. The heat exchange box 401 is installed in the shell 1 by fasteners and is located on the side of the water heating device. , the hot water exchange pipe 402 is arranged in the heat exchange box 401 to transport cold water and preheat the cold water in the heat exchange box 401, the water inlet joint 403 is arranged at the bottom of the heat exchange box 401 to connect the water inlet pipe 2 and the hot water exchange pipe 402, so that the cold water is input into the direction of the hot water exchange pipe 402, the water outlet joint 404 is arranged at the bottom of the heat exchange box 401 to connect the hot water exchange pipe 402 and the water heating device, so that the preheated water is input into the direction of the water heating device, the drain joint 405 is arranged at the bottom of the heat exchange box 401 to connect the heat exchange box 401 with the external environment, so that the condensed water generated by the high-temperature flue gas after heat exchange is discharged out of the heat exchange box 401, and the high-temperature flue gas discharged from the water heating device partially enters the flue gas heat exchange device 4, and the flue gas heat exchange device 4 Part of the flue gas generated by the heating device is reused and preheated for cold water, thereby reducing the loss of heat energy generated by the water heating device, improving the utilization rate of gas by the gas water heater, and being beneficial to energy saving. The drainage structure also includes a drain valve 406, which includes a valve cover 4063, a valve shell 4064, and a valve core 4065. The valve cover 4063 and the valve shell 4064 are preferably made of metal material or plastic material. The valve cover 4063 and the valve shell 4064 are covered with each other by a spiral structure or a buckling structure to form a drainage chamber 4066. The valve core 4065 is spherical and made of rubber material or silicone material and is arranged in the drainage chamber 4066. When the buoyancy of the condensed water in the drainage chamber 4066 is greater than the weight of the valve core 4065,Under the buoyancy of the condensed water, the valve core 4065 moves upward along the drain chamber 4066, moving away from the water inlet end of the water valve outlet 4062 to open the water valve outlet 4062, allowing the condensed water in the drain chamber 4066 to be discharged from the drain valve 406. When the buoyancy of the condensed water in the drain chamber 4066 is less than the weight of the valve core 4065, the valve core 4065 moves downward along the drain chamber 4066 under the action of gravity, and the valve core 4065 abuts against the water inlet end of the water valve outlet 4062 to close the water valve outlet 4062, causing the condensed water in the drain chamber 4066 to remain in the drain valve 406, thereby enabling the drain valve 4066 to start or stop discharging the condensed water to the external environment.

[0029] In addition, the gas water heater uses the flue gas heat exchange device 4 to preheat the cold water, thereby improving the heat exchange efficiency of the combustion water heater for the cold water and improving the heating efficiency of the combustion water heater to a certain extent.

[0030] Furthermore, in this embodiment, a heat exchange chamber 4011, a smoke inlet 4012, and a smoke outlet 4013 are provided on the heat exchange box 401. The water exchange water pipe 402 is arranged in the heat exchange chamber 4011. The smoke inlet 4012 is arranged on the side of the heat exchange box 401 and connects the water heating device and the heat exchange chamber 4011 to allow high-temperature flue gas to enter the heat exchange chamber 4011 and preheat the cold water. The smoke outlet 4013 is arranged at the top of the heat exchange box 401 and connects the heat exchange chamber 4011 with the external environment to allow high-temperature flue gas to be discharged from the heat exchange chamber 4011. Through the above technical solution, high-temperature flue gas can enter the heat exchange box 401 for heat exchange and be discharged from the heat exchange box 401, which can be understood by those skilled in the art.

[0031] Furthermore, in this embodiment, the heat exchange box 401 is further provided with a first joint mounting hole 4014, a second joint mounting hole 4015, and a third joint mounting hole 4016. The first joint mounting hole 4014 is provided on the bottom surface of the heat exchange box 401. The size of the first joint mounting hole 4014 is equivalent to the size of the water inlet joint 403, so that the water inlet joint 403 can be detachably mounted on the heat exchange box 401. The second joint mounting hole 4015 is provided on the bottom surface of the heat exchange box 401. The size is equivalent to that of the water outlet joint 404, so that the water outlet joint 404 can be detachably installed on the heat exchange box body 401. The third joint mounting hole 4016 is set on the bottom surface of the heat exchange box body 401. The size of the third joint mounting hole 4016 is equivalent to that of the drain joint 405, so that the drain joint 405 can be detachably installed on the heat exchange box body 401. Through the above technical solution, the water inlet joint 403, the water outlet joint 404, and the drain joint 405 are installed on the heat exchange box body 401, which can be understood by those skilled in the art.

[0032] Furthermore, in this embodiment, the hot water exchange pipe 402 is spirally shaped and evenly arranged in the heat exchange cavity 4011 of the heat exchange box 401. The water inlet end of the hot water exchange pipe 402 extends toward the bottom of the heat exchange box 401 and is connected to the water inlet joint 403. The water outlet end of the hot water exchange pipe 402 extends toward the bottom of the heat exchange box 401 and is connected to the water outlet joint 404. Through the above technical solution, the hot water exchange pipe 402 is installed in the heat exchange cavity 4011 and connected to the external water source and water heating device, which can be understood by those skilled in the art.

[0033] Furthermore, one end of the drainage structure is connected to the drainage connector 405, and the other end thereof is connected to the external environment. Specifically, in this embodiment, the drainage structure also includes a drainage pipe 407, and the drainage valve 406 is provided with a water valve inlet 4061 and a water valve outlet 4062. The water valve inlet 4061 is located at the top of the drainage valve 406, and the water valve outlet 4062 is located at the bottom of the drainage valve 406. The drainage pipe 407 is preferably a hose and is arranged between the drainage connector 405 and the drainage valve 406 and is respectively connected to the drainage connector 405 and the water valve inlet 4061, so that the condensed water is discharged from the heat exchange box 401 and enters the drainage valve 406 through the water valve inlet 4061. The water valve outlet 4062 extends out of the shell 1 and is connected to the external environment, so that the condensed water in the drainage valve 406 is discharged into the external environment. This can be understood by those skilled in the art.

[0034] Furthermore, in this embodiment, the drain valve 406 also includes a monitoring component. Specifically, in this embodiment, the monitoring component is preferably a detection head and is arranged on the valve cover 4063 and is electrically connected to the control board of the gas water heater. The monitoring end of the monitoring component extends into the drain cavity 4066 to monitor the capacity of the condensed water in the drain cavity 4066. Specifically, when the condensed water in the drain cavity 4066 contacts the monitoring end of the monitoring component, the monitoring component sends a signal to the control board of the gas water heater, causing the control board of the gas water heater to stop the gas water heater from continuing to work. Through the above technical solution, the backflow of condensed water is avoided and the normal operation of the gas water heater is guaranteed, which can be understood by those skilled in the art.

[0035] 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, which is defined by the appended claims and their equivalents.

Claims

1. A flue gas heat exchange device for a gas water heater, comprising a shell (1), a water heating device arranged in the shell (1) and heating cold water by burning gas, a water inlet pipe (2) connecting an external water source and the water heating device and inputting cold water, and a water outlet pipe (3) connecting the water heating device and the external environment and outputting hot water, wherein the water heating device comprises a burner (501), a heat exchanger (502), and a smoke hood (503) arranged in sequence from bottom to top, the smoke hood (503) being provided with a first smoke exhaust port (5031) for exhausting high-temperature smoke to the external environment, and a second smoke exhaust port (5032) for exhausting high-temperature smoke to the flue gas heat exchange device (4), the first smoke exhaust port (5031) being provided at the top of the smoke hood (503) and extending outside the shell (1), the second smoke exhaust port (5032) being provided at the side of the smoke hood (503) and connected to the flue gas heat exchange device (4), and characterized in that: The gas water heater further comprises a flue gas heat exchange device (4) and a drainage structure for discharging condensed water to the external environment. The flue gas heat exchange device (4) is arranged in the housing (1) and is located between the water inlet pipe (2) and the water heating device. The high-temperature flue gas discharged by the water heating device partially enters the flue gas heat exchange device (4) and preheats the cold water. The drainage structure comprises a drainage valve (406). The drainage valve (406) comprises a valve cover (4063), a valve housing (4064), and a valve core (4065). The valve cover (4063) and the valve housing (406) are connected to each other. 4) They cover each other and form a drainage cavity (4066), the valve core (4065) is arranged in the drainage cavity (4066), the buoyancy of the condensed water in the drainage cavity (4066) is greater than the weight of the valve core (4065), the valve core (4065) is away from the water inlet end of the water valve outlet (4062) to open the water valve outlet (4062), the buoyancy of the condensed water in the drainage cavity (4066) is less than the weight of the valve core (4065), the valve core (4065) is against the water inlet end of the water valve outlet (4062) to close the water valve outlet (4062).

2. The flue gas heat exchange device of the gas water heater according to claim 1, characterized in that: The flue gas heat exchange device (4) comprises a heat exchange box (401), a heat exchange water pipe (402) arranged on the heat exchange box (401) and used for conveying cold water, a water inlet joint (403) connecting the water inlet pipe (2) and the heat exchange water pipe (402) and inputting cold water into the heat exchange water pipe (402), a water outlet joint (404) connecting the heat exchange water pipe (402) and the water heating device and outputting preheated water to the water heating device, and a drain joint (405) connecting the heat exchange box (401) and the external environment and used for discharging condensed water in the heat exchange box (401), wherein the heat exchange water pipe (402) is arranged in the heat exchange box (401), and the water inlet joint (403), the water outlet joint (404), and the drain joint (405) are all arranged at the bottom of the heat exchange box (401).

3. The flue gas heat exchange device of the gas water heater according to claim 2, characterized in that: The heat exchange box (401) is provided with a heat exchange chamber (4011), a smoke inlet (4012) connecting the water heating device and the heat exchange chamber (4011) and used for high-temperature flue gas to enter the heat exchange chamber (4011), and a smoke outlet (4013) connecting the heat exchange chamber (4011) and the external environment and used for high-temperature flue gas to discharge the heat exchange chamber (4011); the water exchange water pipe (402) is arranged in the heat exchange chamber (4011), the smoke inlet (4012) is arranged on the side of the heat exchange box (401), and the smoke outlet (4013) is arranged on the top of the heat exchange box (401).

4. The flue gas heat exchange device of the gas water heater according to claim 2, characterized in that: The heat exchange box (401) is further provided with a first joint mounting hole (4014) for mounting a water inlet joint (403), a second joint mounting hole (4015) for mounting a water outlet joint (404), and a third joint mounting hole (4016) for mounting a drain joint (405); the first joint mounting hole (4014), the second joint mounting hole (4015), and the third joint mounting hole (4016) are all located on the bottom surface of the heat exchange box (401).

5. The flue gas heat exchange device of the gas water heater according to claim 2, characterized in that: The hot water exchange pipe (402) is spirally shaped and evenly arranged in the heat exchange box (401); the water inlet end of the hot water exchange pipe (402) extends toward the bottom of the heat exchange box (401) and is connected to the water inlet joint (403); the water outlet end of the hot water exchange pipe (402) extends toward the bottom of the heat exchange box (401) and is connected to the water outlet joint (404).

6. The flue gas heat exchange device of a gas water heater according to claim 2, characterized in that: One end of the drainage structure is in communication with the drainage joint (405), and the other end thereof is in communication with the external environment. The drainage structure further comprises a drainage pipe (407). The drainage valve (406) is provided with a water valve inlet (4061) and a water valve outlet (4062). The drainage pipe (407) is arranged between the drainage joint (405) and the drainage valve (406) and is in communication with the drainage joint (405) and the water valve inlet (4061), respectively. The water valve outlet (4062) extends out of the housing (1) and is in communication with the external environment.

7. The flue gas heat exchange device of a gas water heater according to claim 1, characterized in that: The drain valve (406) further includes a monitoring component, which is arranged on the valve cover (4063) and / or the valve housing (4064), and a monitoring end thereof extends into the drain cavity (4066) for monitoring the volume of condensed water in the drain cavity (4066).

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