A heating device for a gas water heater

Abstract

The present invention belongs to the technical field of gas water heaters, and specifically refers to a heating device for gas water heaters, including a main box body with a flue gas passage, an inverted burner arranged on the main box body and having a nozzle located in the flue gas passage, and a heat exchange tube located below the inverted burner and horizontally arranged on the flue gas passage, a flow channel with a water inlet and a water outlet is provided on the main box body, and the flow channel is adjacent to the heat exchange tube, a smoke exhaust port is provided on the flue gas passage, a condensate collection chamber is formed in the flue gas passage located below the heat exchange tube, and a condensate outlet is provided on the main box body. In the present invention, the high-temperature flue gas generated by the inverted burner will be transferred from top to bottom along the flue gas passage through the heat exchange tube for heat exchange, and the condensate formed on the outer surface of the heat exchange tube will drip downward to the condensate collection chamber under the action of gravity, which effectively avoids the situation in which the condensate drips onto the inverted burner and causes corrosion of the inverted burner compared to the prior art.

Description

Technical field:

[0001] The invention belongs to the technical field of gas water heaters, and in particular relates to a heating device for gas water heaters. Background technology:

[0002] Existing condensing gas water heaters generally have flames burning upwards, and adopt an exhaust method of taking in gas from the bottom and exhausting smoke from the top. Gas water heaters with this exhaust method generally have a heat exchanger set at the top or side, but for condensing gas water heaters, this setting will have many disadvantages in long-term use: the condensed water generated by the heat exchanger drips onto the burner and causes corrosion to the burner, which not only reduces the combustion efficiency, but also affects the service life of the burner, and is not conducive to the discharge of condensed water. Summary of the invention:

[0003] The object of the present invention is to provide a heating device for a gas water heater, in which the burner is inverted to avoid being corroded by condensed water and to facilitate the discharge of condensed water.

[0004] The present invention is achieved in that:

[0005] A heating device for a gas water heater comprises a main box body with a smoke passage, an inverted burner arranged on the main box body and having a nozzle located in the smoke passage, and a heat exchange tube located below the inverted burner and horizontally extending through the smoke passage, a flow passage with a water inlet and a water outlet is provided on the main box body, and the flow passage is adjacent to the heat exchange tube, a smoke exhaust port connected to the outside is provided at one end of the smoke passage away from the inverted burner and the heat exchange tube, a condensate collecting chamber for collecting condensate is formed in the smoke passage below the heat exchange tube, and a condensate outlet connected to the condensate collecting chamber is provided on the main box body.

[0006] In the above-mentioned heating device for a gas water heater, the main box body includes a heat exchange shell and a condensate collecting shell spliced ​​together upper and lower, the inner cavity of the heat exchange shell is connected to the inner cavity of the condensate collecting shell and forms the flue gas channel, and the inner cavity of the condensate collecting shell is the condensate collecting cavity, the inverted burner and the heat exchange tube are arranged on the heat exchange shell, and the smoke exhaust port is opened on the condensate collecting shell or the heat exchange shell.

[0007] In the above-mentioned heating device for a gas water heater, the condensed water outlet is provided on the lower end surface of the condensed water collecting shell, and the smoke exhaust port is arranged upward on the upper end surface of the condensed water collecting shell.

[0008] In the above-mentioned heating device for a gas water heater, it also includes a gas premixer, a gas mixing chamber is provided in the gas premixer, an air inlet port, an air inlet port and an air outlet port connected to the gas mixing chamber are provided on the gas premixer, the air outlet port is connected to the air inlet of the inverted burner, the air inlet port is connected to the air outlet of the fan, and the air inlet port is connected to an external gas source.

[0009] In the above-mentioned heating device for a gas water heater, a throat is provided in the gas mixing chamber between the air inlet port and the air outlet port, and both ends of the throat are sealed and connected to the gas mixing chamber. The corresponding port size of the throat close to the air inlet port is smaller than the corresponding port size close to the air outlet port, and the air inlet port is connected to the middle part of the throat.

[0010] In the above-mentioned heating device for a gas water heater, a wind pressure switch for detecting the wind pressure in the air inlet port is arranged on the gas premixer near the air inlet port. The wind pressure switch is electrically connected to the control assembly, and the control assembly controls the speed of the fan according to the signal of the wind pressure switch.

[0011] In the above-mentioned heating device for a gas water heater, the heat exchange tubes include a plurality of rows of flat heat exchange tubes arranged vertically, each of which is provided with a heat exchange fin, and the flat heat exchange tubes in the same row and between two adjacent rows of flat heat exchange tubes are connected by flow channels.

[0012] In the above-mentioned heating device for a gas water heater, the flat heat exchange tubes are arranged in three or four rows.

[0013] In the above-mentioned heating device for a gas water heater, the heat exchange tubes include a plurality of circular heat exchange tubes arranged side by side, and a plurality of rows of flat heat exchange tubes located below the circular heat exchange tubes and arranged vertically. The flat heat exchange tubes are each sleeved with heat exchange fins, and the adjacent circular heat exchange tubes, the circular heat exchange tubes and the flat heat exchange tubes located in the top row, the flat heat exchange tubes located in the same row, and the flat heat exchange tubes in two adjacent rows above and below are connected through flow channels.

[0014] In the above-mentioned heating device for gas water heater, the heat exchange plate is in a sheet-like structure, and a plurality of heat exchange plates are arranged axially at intervals along the corresponding row of flat heat exchange tubes. The heat exchange plate is provided with a plurality of mounting holes for the flat heat exchange tubes in the same row to pass through.

[0015] The outstanding advantages of the present invention compared with the prior art are:

[0016] The present invention arranges the inverted burner above the heat exchange tube. The high-temperature flue gas generated by the inverted burner will pass through the heat exchange tube from top to bottom along the flue gas channel for heat exchange transfer, and the condensed water formed on the outer surface of the heat exchange tube will drip downward to the condensed water collecting chamber under the action of gravity. Compared with the prior art, it effectively avoids the situation where the condensed water drips onto the inverted burner and causes corrosion of the inverted burner. At the same time, the condensed water in the condensed water collecting chamber can also be discharged outward through the condensed water outlet, which is easy to clean. Description of the drawings:

[0017] Figure 1 is a three-dimensional diagram of the first embodiment of the present invention;

[0018] Figure 2 is a cross-sectional view of embodiment 1 of the present invention;

[0019] Figure 3 is a cross-sectional view of a second embodiment of the present invention;

[0020] Figure 4 It is a cross-sectional view of the third embodiment of the present invention.

[0021] In the figure: 1. Smoke duct; 2. Main box; 3. Inverted burner; 4. Circulation channel; 5. Smoke exhaust port; 6. Condensate collection chamber; 7. Heat exchange shell; 8. Condensate collection shell; 9. Gas premixer; 10. Air inlet port; 11. Air inlet port; 12. Air outlet port; 13. Fan; 14. Throat; 15. Air pressure switch; 16. Flat heat exchange tube; 17. Heat exchange plate; 18. Round heat exchange tube. Specific implementation method:

[0022] The present invention is further described below with reference to specific embodiments. Figure 1 —4:

[0023] Embodiment 1:

[0024] A heating device for a gas water heater comprises a main box body 2 having a flue gas passage 1, an inverted burner 3 arranged on the main box body 2 and having a nozzle located in the flue gas passage 1, and a heat exchange tube located below the inverted burner 3 and horizontally extending through the flue gas passage 1, a flow channel 4 having a water inlet and a water outlet is provided on the main box body 2, and the flow channel 4 is adjacent to the heat exchange tube, a smoke exhaust port 5 connected to the outside is provided at one end of the flue gas passage 1 away from the inverted burner 3 and the heat exchange tube, a condensate collecting chamber 6 for collecting condensate is formed in the flue gas passage 1 below the heat exchange tube, and a condensate outlet connected to the condensate collecting chamber 6 is provided on the main box body 2.

[0025] The present invention arranges the inverted burner 3 above the heat exchange tube. The high-temperature flue gas generated by the inverted burner 3 will pass through the heat exchange tube from top to bottom along the flue gas channel 1 for heat exchange transfer, and the condensed water formed on the outer surface of the heat exchange tube drips downward to the condensed water collecting chamber 6 under the action of gravity. Compared with the prior art, it effectively avoids the situation where the condensed water drips onto the inverted burner 3 and causes corrosion of the inverted burner 3. At the same time, the condensed water in the condensed water collecting chamber 6 can also be discharged outward through the condensed water outlet, which is convenient for cleaning.

[0026] Meanwhile, in this embodiment, the specific composition structure of the main housing 2 is as follows: the main housing 2 includes a heat exchange shell 7 and a condensate collection shell 8 spliced ​​up and down, the inner cavity of the heat exchange shell 7 is connected to the inner cavity of the condensate collection shell 8 and forms the flue gas channel 1, and the inner cavity of the condensate collection shell 8 is the condensate collection chamber 6, the inverted burner 3 and the heat exchange pipe are arranged on the heat exchange shell 7, and the smoke exhaust port 5 is opened on the condensate collection shell 8 or the heat exchange shell 7. Among them, the inner cavity of the heat exchange shell 7 has no upper end face and lower end face, the inverted cover of the inverted burner 3 is arranged at the upper end port of the inner cavity of the heat exchange shell 7, and the cover of the condensate collection shell 8 is arranged on the lower end port of the inner cavity of the heat exchange shell 7.

[0027] Furthermore, in order to facilitate the discharge of condensed water, the condensed water outlet is opened on the lower end surface of the condensed water collecting shell 8. At the same time, in this embodiment, the smoke exhaust port 5 is arranged on the condensed water collecting shell 8, and the smoke exhaust port 5 is arranged upward on the upper end surface of the condensed water collecting shell 8.

[0028] In addition, a gas premixer 9 is included, in which a gas mixing chamber is provided, and an air inlet port 10, an air inlet port 11 and an air outlet port 12 which are connected to the gas mixing chamber are provided on the gas premixer 9, the air outlet port 12 is connected to the air inlet of the inverted burner 3, the air inlet port 10 is connected to the air outlet of the fan 13, and the air inlet port 11 is connected to an external gas source, that is, air and gas are fully mixed in the gas premixer 9 to form a mixed gas for combustion by the inverted burner 3.

[0029] At the same time, in order to make the air and the gas be mixed more fully, a throat 14 is provided in the gas mixing chamber between the air inlet port 10 and the gas outlet port 12, and both ends of the throat 14 are sealed and connected to the gas mixing chamber, and the size of the corresponding port of the throat 14 close to the air inlet port 10 is smaller than the size of the corresponding port close to the gas outlet port 12, and the air inlet port 11 is connected to the middle of the throat 14. That is, the air enters from the port with a smaller diameter of the throat 14, so that a negative pressure is formed in the throat 14, thereby causing a certain amount of gas to be sucked into the throat 14 from the air inlet port 11, and finally forming a mixed gas with a certain proportion of air and gas.

[0030] Furthermore, in order to reasonably control the working power of the fan 13, a wind pressure switch 15 for detecting the wind pressure in the air inlet port 10 is provided on the gas premixer 9 near the air inlet port 10. The wind pressure switch 15 is electrically connected to the control assembly, and the control assembly controls the speed of the fan 13 according to the signal of the wind pressure switch 15.

[0031] Furthermore, in order to enable the heat exchange tubes and the high-temperature flue gas to fully exchange heat, the heat exchange tubes include a plurality of rows of flat heat exchange tubes 16 arranged vertically, and the flat heat exchange tubes 16 are sleeved with heat exchange fins 17. The flat heat exchange tubes 16 in the same row and the flat heat exchange tubes 16 in two adjacent rows are connected through the circulation channels 4. At the same time, a water outlet is provided on the circulation channel 4 directly connected to the flat heat exchange tubes 16 in the top row, and a water inlet is provided on the circulation channel 4 directly connected to the flat heat exchange tubes 16 in the bottom row.

[0032] Furthermore, in this embodiment, the flat heat exchange tubes 16 are arranged in three rows.

[0033] Furthermore, the heat exchange fins 17 are in a sheet-like structure, and a plurality of them are arranged at intervals along the axial direction of the corresponding row of flat heat exchange tubes 16 . The heat exchange fins 17 are provided with a plurality of mounting holes for the flat heat exchange tubes 16 in the same row to pass through.

[0034] Embodiment 2:

[0035] The structure of this embodiment is basically the same as that of the above-mentioned embodiment 1, and the main difference is that the flat heat exchange tubes 16 are arranged in four rows, which can more fully transfer heat and improve the heat exchange efficiency compared with the embodiment 1.

[0036] Embodiment three:

[0037] The structure of this embodiment is basically the same as that of the first embodiment, and the main difference is that the heat exchange tubes include a plurality of circular heat exchange tubes 18 arranged side by side, and a plurality of rows of flat heat exchange tubes 16 located below the circular heat exchange tubes 18 and arranged vertically, and the flat heat exchange tubes 16 are sleeved with heat exchange fins 17, and the two adjacent circular heat exchange tubes 18, the circular heat exchange tubes 18 and the flat heat exchange tubes 16 located in the top row, the flat heat exchange tubes 16 located in the same row, and the flat heat exchange tubes 16 in the upper and lower adjacent rows are respectively connected through the circulation channel 4. At the same time, the circulation channel 4 directly connected to the circular heat exchange tubes 18 is provided with a water outlet, and the circulation channel 4 directly connected to the flat heat exchange tubes 16 located in the bottom row is provided with a water inlet.

[0038] The above embodiment is only one of the preferred embodiments of the present invention, and is not intended to limit the scope of implementation of the present invention. Therefore, any equivalent changes made based on the shape, structure, and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A heating device for a gas water heater, characterized in that: The invention comprises a main box (2) having a smoke passage (1), an inverted burner (3) arranged on the main box (2) and having a nozzle located in the smoke passage (1), and a heat exchange tube located below the inverted burner (3) and horizontally extending through the smoke passage (1); a flow passage (4) having a water inlet and a water outlet is provided on the main box (2), and the flow passage (4) and the heat exchange tube are adjacent to each other; a smoke exhaust port (5) communicating with the outside is provided at one end of the smoke passage (1) away from the inverted burner (3) and the heat exchange tube; a condensate collection chamber (6) for collecting condensate is formed in the smoke passage (1) below the heat exchange tube; and a condensate outlet communicating with the condensate collection chamber (6) is provided on the main box (2); It also includes a gas premixer (9), wherein a gas mixing chamber is provided in the gas premixer (9), and an air inlet port (10), an air inlet port (11), and an air outlet port (12) are provided on the gas premixer (9) and are connected to the gas mixing chamber, wherein the air outlet port (12) is connected to the air inlet of the inverted burner (3), the air inlet port (10) is connected to the air outlet of the fan (13), and the air inlet port (11) is connected to an external gas source; A throat (14) is provided in the gas mixing chamber between the air inlet port (10) and the air outlet port (12), and both ends of the throat (14) are sealedly connected to the gas mixing chamber, the corresponding port size of the throat (14) close to the air inlet port (10) is smaller than the corresponding port size close to the air outlet port (12), and the air inlet port (11) is connected to the middle of the throat (14); A gas premixer (9) near the air inlet port (10) is provided with an air pressure switch (15) for detecting the wind pressure in the air inlet port (10); the air pressure switch (15) is electrically connected to the control assembly, and the control assembly controls the speed of the fan (13) according to a signal from the air pressure switch (15); The heat exchange tubes include a plurality of circular heat exchange tubes (18) arranged side by side, and a plurality of rows of flat heat exchange tubes (16) located below the circular heat exchange tubes (18) and arranged vertically, each of the flat heat exchange tubes (16) being sleeved with a heat exchange fin (17), and the two adjacent circular heat exchange tubes (18), the circular heat exchange tubes (18) and the flat heat exchange tubes (16) located in the top row, the flat heat exchange tubes (16) located in the same row, and the flat heat exchange tubes (16) in two adjacent rows above and below are connected through the circulation channels (4); A water outlet is provided on the circulation channel (4) directly connected to the circular heat exchange tube (18), and a water inlet is provided on the circulation channel (4) directly connected to the flat heat exchange tube (16) located in the bottom row; The heat exchange fins (17) are in a sheet-like structure and are arranged in a plurality at intervals along the axial direction of the corresponding row of flat heat exchange tubes (16). The heat exchange fins (17) are provided with a plurality of mounting holes for the flat heat exchange tubes (16) in the same row to pass through.

2. A heating device for a gas water heater according to claim 1, characterized in that: The main box body (2) includes a heat exchange shell (7) and a condensate collection shell (8) which are spliced ​​together from top to bottom. The inner cavity of the heat exchange shell (7) is connected to the inner cavity of the condensate collection shell (8) to form the flue gas channel (1), and the inner cavity of the condensate collection shell (8) is the condensate collection chamber (6). The inverted burner (3) and the heat exchange tube are arranged on the heat exchange shell (7), and the smoke exhaust port (5) is opened on the condensate collection shell (8) or the heat exchange shell (7).

3. A heating device for a gas water heater according to claim 2, characterized in that: The condensate outlet is opened on the lower end surface of the condensate collecting shell (8), and the smoke exhaust port (5) is arranged upward on the upper end surface of the condensate collecting shell (8).

Images