Gas water heater

Abstract

The utility model discloses a gas water heater relates to gas water heater technical field. Gas water heater includes the fume collecting hood, heat exchanger and combustion chamber casing, and the fume collecting hood is connected with the upper end of heat exchanger, and the lower extreme of heat exchanger is connected with combustion chamber casing. Combustion chamber casing has inner casing and outer casing, and the first airflow channel is formed between inner casing and outer casing, and the second airflow channel is formed between outer casing and heat exchanger. The bottom of combustion chamber casing is equipped with the air inlet of communicating with the first airflow channel. The air inlet, the first airflow channel, the second airflow channel and the inner chamber of fume collecting hood are communicated in proper order. The first airflow channel and the second airflow channel are arranged from bottom to top in combustion chamber casing, and the combustion chamber forms the negative pressure in the working process of gas water heater, and under atmospheric pressure, the outside cold air is constantly entered the first airflow channel and the second airflow channel with outer casing and exchanges heat fully through the air inlet, is not affected by the wind speed of fan, has guaranteed the stability of heat dissipation, and has improved the cooling effect.

Description

Technical Field

[0001] This utility model relates to the field of gas water heater technology, and in particular to a gas water heater. Background Technology

[0002] Existing gas water heaters use a fan on the fume hood to supply oxygen to the combustion chamber, while simultaneously cooling the combustion chamber shell through air cooling. However, the heat dissipation effect of the combustion chamber shell is affected by the fan speed. When the fan speed is unstable, it can lead to poor airflow within the air-cooling channels of the combustion chamber shell, thus affecting the heat dissipation effect. Utility Model Content

[0003] The technical problem solved by this utility model is to provide a gas water heater that can solve the problem of unstable heat dissipation effect caused by the influence of fan speed on the heat dissipation of the combustion chamber shell in the prior art, and improve the stability of heat dissipation and cooling effect of the combustion chamber shell.

[0004] The above-mentioned technical problems are solved by the following technical solutions:

[0005] A gas water heater includes a fume hood, a heat exchanger, and a combustion chamber shell. The fume hood is connected to the upper end of the heat exchanger, and the lower end of the heat exchanger is connected to the combustion chamber shell.

[0006] The combustion chamber shell has an inner shell and an outer shell, a first airflow channel is formed between the inner shell and the outer shell, and a second airflow channel is formed between the outer shell and the heat exchanger;

[0007] The bottom of the combustion chamber housing is provided with an air inlet that communicates with the first airflow channel;

[0008] The air inlet, the first airflow channel, the second airflow channel, and the inner cavity of the smoke hood are connected in sequence.

[0009] The gas water heater described in this utility model has the following advantages compared with the prior art:

[0010] The gas water heater provided by this utility model creates a negative pressure during operation. Under atmospheric pressure, a suction force is generated within the smoke hood, causing external cold air to continuously enter the first airflow channel, the second airflow channel, and the inner cavity of the smoke hood through the air inlet at the bottom of the combustion chamber shell before being discharged. Cold air constantly exchanges heat with the outer shell and inner shell, thus rapidly reducing the temperature of the outer shell. In this gas water heater, the combustion chamber shell is provided with a first airflow channel and a second airflow channel from bottom to top. During operation, under atmospheric pressure, external cold air continuously enters the first and second airflow channels through the air inlet, exchanging heat with the outer shell. This is unaffected by the fan speed, ensuring stable heat dissipation and improving the cooling effect.

[0011] In one embodiment, the outer shell has four side walls, the inner shell includes four heat insulation plates, each side wall is provided with a corresponding heat insulation plate, and a first airflow channel is formed around and connected to each heat insulation plate and its corresponding side wall.

[0012] The bottom of each of the four side walls is provided with an air inlet.

[0013] In one embodiment, the housing has a front side panel and a rear side panel disposed opposite to each other;

[0014] A second airflow channel is formed between the front side plate and the heat exchanger, and between the rear side plate and the heat exchanger;

[0015] The front and rear sides of the heat exchanger are both in contact with the sidewalls of the corresponding insulation plates.

[0016] In one embodiment, the upper ends of both the front side plate and the rear side plate are bent inward to form a first limiting plate, the first limiting plate including a first horizontal plate and a first vertical plate connected vertically;

[0017] The first vertical plate forms a second airflow channel with the heat exchanger, and the first horizontal plate and the top wall of the corresponding heat insulation plate form a connecting channel that connects the first airflow channel and the second airflow channel.

[0018] In one embodiment, the smoke hood is positioned outside the first vertical plate and connected to the first horizontal plate.

[0019] In one embodiment, the inner wall of the front side plate and the inner wall of the rear side plate are each provided with two symmetrically arranged guide members, and the distance between the two guide members is set to be narrower at the top and wider at the bottom.

[0020] In one embodiment, the guide includes a vertical portion and an inclined portion arranged at an angle, the inclined portion being located above the vertical portion, the angle being 120° to 165°.

[0021] In one embodiment, both the front and rear side plates are internally convex with two symmetrical guide bosses, which form the guide member.

[0022] In one embodiment, each of the four sidewalls is provided with a first support boss, and the heat exchanger and the first support boss clamp and fix the upper part of the heat insulation plate.

[0023] In one embodiment, the height of the first support boss is 2mm to 5mm. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments of this utility model will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the content of the embodiments of this utility model and these drawings without creative effort.

[0025] Figure 1 This is a side sectional view of a gas water heater provided in a specific embodiment of this utility model;

[0026] Figure 2 yes Figure 1 A magnified view of a section at point A in the middle;

[0027] Figure 3 This is a side sectional view of the combustion chamber shell provided in a specific embodiment of this utility model;

[0028] Figure 4 This is a cross-sectional view of the combustion chamber shell provided in a specific embodiment of this utility model;

[0029] Figure 5 This is an exploded view of the combustion chamber shell provided in a specific embodiment of this utility model;

[0030] Figure 6 This is a schematic diagram of the outer shell provided in a specific embodiment of the present utility model;

[0031] Figure 7 This is a schematic diagram of the front panel provided in a specific embodiment of the present invention;

[0032] Figure 8 This is a schematic diagram of the structure of the outer plate provided in a specific embodiment of this utility model;

[0033] Figure 9 This is a structural schematic diagram of a gas water heater provided in a specific embodiment of this utility model;

[0034] Figure 10 This is a schematic diagram of the internal structure of the smoke collection hood provided in a specific embodiment of this utility model.

[0035] In the picture:

[0036] 100, First airflow channel; 200, Second airflow channel; 300, Inner cavity; 400, Connecting channel;

[0037] 1. Smoke hood; 11. Chimney; 111. Air outlet; 12. Smoke hood body; 13. Wind baffle; 14. Flow deflector; 15. Negative pressure pull-out area;

[0038] 2. Heat exchanger;

[0039] 3. Combustion chamber shell; 30. Outer shell; 31. Peripheral plate; 311. Rear side plate; 312. Left side plate; 313. Right side plate; 32. Front side plate; 33. Heat insulation plate; 34. Guide boss; 341. Vertical part; 342. Inclined part; 35. First support boss; 36. Second limiting plate; 361. Second horizontal plate; 3611. Air inlet; 362. Second vertical plate; 37. First limiting plate; 371. First horizontal plate; 3711. Second support boss; 372. First vertical plate; 3721. Third support boss; 38. Third limiting plate; 381. Third horizontal plate; 382. Third vertical plate;

[0040] 4. Burner. Detailed Implementation

[0041] To make the technical problem solved by this utility model, the technical solution adopted, and the technical effect achieved clearer, the technical solution of this utility model will be further described below with reference to the accompanying drawings and specific embodiments.

[0042] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0043] like Figures 1-3As shown, this embodiment provides a gas water heater, including a smoke hood 1, a heat exchanger 2, a combustion chamber shell 3, and a burner 4. The smoke hood 1 is connected to the upper end of the heat exchanger 2, the lower end of the heat exchanger 2 is connected to the combustion chamber shell 3, and the burner 4 is placed at the lower end of the combustion chamber shell 3.

[0044] The combustion chamber shell 3 has an inner shell and an outer shell 30. A first airflow channel 100 is formed between the inner shell and the outer shell 30, and a second airflow channel 200 is formed between the outer shell 30 and the heat exchanger 2. The bottom of the combustion chamber shell 3 has an air inlet 3611 communicating with the first airflow channel 100, and the top of the smoke hood 1 has an air outlet 111. The air inlet 3611, the first airflow channel 100, the second airflow channel 200, and the inner cavity 300 of the smoke hood 1 are sequentially connected. Figure 1 As indicated by the arrow, external cold air enters the first airflow channel 100, the second airflow channel 200, and the inner cavity 300 of the smoke hood 1 through the air inlet 3611, and is discharged through the air outlet 111.

[0045] Combustion in burner 4 creates negative pressure within the combustion chamber, allowing cold air to enter through inlet 3611, flow through the first airflow channel 100, the second airflow channel 200, and the inner cavity 300 of the fume hood 1, and finally exit through outlet 111. This design ensures that during operation, external cold air continuously enters between the inner and outer shells 30, exchanging heat effectively with the outer shell 30 and rapidly reducing its temperature. In this gas water heater, the combustion chamber shell 3 has a first airflow channel 100 and a second airflow channel 200 arranged from bottom to top. During operation, negative pressure is generated within the combustion chamber. Under atmospheric pressure, a suction force is generated within the fume hood 1, continuously drawing external cold air through inlet 3611 into the first and second airflow channels 100 and 200 for thorough heat exchange with the outer shell 30. This process is unaffected by fan speed, ensuring stable heat dissipation and improving cooling efficiency.

[0046] In one embodiment, such as Figure 4 and Figure 5 As shown, the outer shell 30 has four side walls, and the inner shell includes four heat insulation plates 33. Each side wall is provided with a corresponding heat insulation plate 33, and each heat insulation plate 33 and its corresponding side wall form a first airflow channel 100 that surrounds and communicates with the outer shell. Air inlets 3611 are provided at the bottom of each of the four side walls. That is, a surrounding channel is formed around the combustion chamber shell 3, allowing the cold air entering the first airflow channel 100 to fully contact and exchange heat with the four side walls of the combustion chamber shell 3, achieving uniform heat dissipation.

[0047] In one embodiment, the outer casing 30 has a front side plate 32 and a rear side plate 311 disposed opposite to each other. A second airflow channel 200 is formed between the front side plate 32 and the heat exchanger 2, and between the rear side plate 311 and the heat exchanger 2. The front and rear sides of the heat exchanger 2 are both in contact with the sidewalls of the corresponding heat insulation plate 33. One second airflow channel 200 is provided on each of the opposite sides of the combustion chamber casing 3. Gas in the first airflow channel 100 located around the combustion chamber casing 3 enters the inner cavity 300 of the smoke hood 1 through the two second airflow channels 200.

[0048] In one embodiment, the upper ends of the front side plate 32 and the rear side plate 311 are both bent inward to form a first limiting plate 37. The first limiting plate 37 includes a first horizontal plate 371 and a first vertical plate 372. A second airflow channel 200 is formed between the first vertical plate 372 and the heat exchanger 2. A connecting channel 400 connecting the first airflow channel 100 and the second airflow channel 200 is formed between the first horizontal plate 371 and the top wall of the corresponding heat insulation plate 33.

[0049] In one embodiment, the smoke hood 1 is disposed on the outside of the first vertical plate 372 and connected to the first horizontal plate 371. This arrangement facilitates the assembly of the smoke hood 1 and ensures that the second airflow channel 200 is close to the inner wall of the smoke hood 1, which dissipates heat from the outer casing 30 while reducing the temperature of the smoke hood 1, thus achieving the function of heat dissipation for the smoke hood 1.

[0050] Specifically, the bottom of the smoke hood 1 is provided with an outer edge, which covers the outside of the first vertical plate 372. Since the first vertical plate 372 and the first horizontal plate 371 are connected by an arc, there is a small gap between the side wall of the smoke hood body 12 and the first vertical plate 372. The outer edge abuts against the first horizontal plate 371 and is fixed to the first horizontal plate 371 by welding or bolt connection.

[0051] In this embodiment, the outer shell 30 includes an outer perimeter plate 31 with a front opening and a front side plate 32. The front side plate 32 is disposed on the opening side of the outer perimeter plate 31. The outer perimeter plate 31 includes a left side plate 312, a right side plate 313 and a rear side plate 311 disposed between the left side plate 312 and the right side plate 313. Each of the left side plate 312, the rear side plate 311, the right side plate 313 and the front side plate 32 is provided with a heat insulation plate 33. Each heat insulation plate 33 and its corresponding plate form a first airflow channel 100 that surrounds and communicates with the surrounding area.

[0052] Specifically, the heat insulation board 33 is made of aluminum silicate fiberboard. The dense fiber structure inside the aluminum silicate fiberboard effectively blocks heat transfer, and the porous structure between the fibers significantly slows down heat conduction and convection, thereby reducing the transfer of heat from the combustion chamber shell 3 to the outer plates 31 and the front plate 32, thus providing effective heat insulation. At the same time, the high melting point and low thermal conductivity of aluminum carbonate material itself allow it to withstand high-temperature environments for extended periods, extending its service life. In addition, the high density of the heat insulation board 33 also provides noise reduction.

[0053] Furthermore, air inlets 3611 are provided at the bottom of the left side panel 312, rear side panel 311, right side panel 313, and front side panel 32. This allows external cold air to enter from the bottom of the outer casing 30, increasing the amount of external cold air entering and improving heat dissipation efficiency.

[0054] In one embodiment, such as Figure 1 , Figure 3 , Figures 6-8 As shown, each of the four side walls is provided with a first support boss 35, which clamps and fixes the upper part of the heat exchanger 2 and the first support boss 35 to the heat insulation plate 33. The height of the first support boss 35 is equal to the gap of the first airflow channel 100 (e.g., Figure 3 As shown, the gap of the first airflow channel 100 is J). According to the temperature inside the combustion chamber shell 3, the gap J of the first airflow channel 100 is adjusted by adjusting the height of the first support boss 35, thereby adjusting the intake volume of cold air inside the first airflow channel 100, so as to reduce the temperature of the outer surface of the combustion chamber shell 3.

[0055] Specifically, the first support boss 35 is formed by the inner protrusion of the outer plate 31 and the front side plate 32. The one-piece molding design reduces the processing difficulty and ensures the processing accuracy.

[0056] The tops of the four heat insulation plates 33 abut against the perimeter of the heat exchanger 2 to prevent high-temperature flue gas from leaking out of the combustion chamber shell 3. The heat exchanger 2 includes heat exchange plates, and all the high-temperature flue gas flows between the heat exchange plates to fully exchange heat with them and prevent heat loss.

[0057] In one embodiment, the height of the first support boss 35 is 2mm to 5mm. That is, the gap J of the first airflow channel 100 is controlled within 2mm to 5mm. Based on the length, width and height of the outer shell 30, the flow rate of cold air entering the first airflow channel 100 is sufficient to dissipate heat from the outer surface of the outer shell 30, thereby reducing the temperature of the outer surface of the combustion chamber shell 3.

[0058] In this embodiment, the height of the first support boss 35 is 3.8mm.

[0059] In one embodiment, such as Figure 7 and Figure 8As shown, a second limiting plate 36 is provided at the lower end of the front side panel 32, the left side panel 312, the rear side panel 311, and the right side panel 313. The second limiting plate 36 is a flange that bends inward from the lower end of the outer side panel 31 and the front side panel 32. The second limiting plate 36 includes a second horizontal plate 361 and a second vertical plate 362. The second horizontal plate 361 abuts against the lower end surface of the heat insulation plate 33, and the second vertical plate 362 abuts against the inner wall of the heat insulation plate 33.

[0060] A second support boss 3711 is provided on the first horizontal plate 371, and the second support boss 3711 abuts against the upper end face of the heat insulation plate 33. The heat insulation plate 33 is limited and fixed by the second limiting plate 36, the first limiting plate 37 and the heat exchanger 2, so as to stably clamp the four heat insulation plates 33 between the heat exchanger 2, the outer plate 31 and the front side plate 32. The second support boss 3711 on the first horizontal plate 371 limits the upper end face of the heat insulation plate 33, and the gap between the second support bosses 3711 forms a connecting channel 400, so that the gas in the first airflow channel 100 can enter the second airflow channel 200 through the connecting channel 400.

[0061] In this embodiment, a third support boss 3721 is provided on the first vertical plate 372. The third support boss 3721 abuts against the heat exchanger 2 and is used to limit the front and rear sides of the heat exchanger 2.

[0062] The upper ends of the left side plate 312 and the right side plate 313 are each provided with a third limiting plate 38. The third limiting plate 38 includes a third horizontal plate 381 and a third vertical plate 382. The heat exchanger 2 is sandwiched between the two third vertical plates 382 and is fixedly connected to the two third vertical plates 382 by screws.

[0063] In one embodiment, the air inlet 3611 is provided on the second horizontal plate 361. External cold air passes through the air inlet 3611 and enters the first airflow channel 100 through the second horizontal plate 361. A large amount of external cold air comes into contact with the second horizontal plate 361. The heat insulation plate 33 can also exchange heat with the external air through the second horizontal plate 361, further reducing the heat transferred by the heat insulation plate 33 to the outer plate 31 and the front plate 32.

[0064] In this embodiment, the specific number and shape of the first support boss 35, the second support boss 3711 and the third support boss 3721 are not limited, as long as they can satisfy the function of stable support.

[0065] In one embodiment, the inner walls of both the front side plate 32 and the rear side plate 311 are provided with two symmetrically arranged guide members, with the distance between the two guide members being narrower at the top and wider at the bottom. The arrangement of the two guide members guides the gas within the first airflow channel 100 around the combustion chamber shell 3, directing it to two opposing second airflow channels 200. Specifically, the airflow entering between the front side plate 32 and the heat insulation plate 33, and the airflow between the rear side plate 311 and the heat insulation plate 33, enters the second airflow channel 200 along the area between the two guide members. The airflow entering between the left side plate 312 and the heat insulation plate 33, and the airflow between the right side plate 313 and the heat insulation plate 33, enters the second airflow channel 200 under the guidance of the opposite sides of the two guide members. This achieves orderly guided flow of gas around the combustion chamber shell 3, accelerates the airflow velocity, and thus accelerates the cooling rate.

[0066] In one embodiment, the guide includes a vertical portion 341 and an inclined portion 342 arranged at an angle, with the inclined portion 342 located above the vertical portion 341 and the angle being 120° to 165°.

[0067] like Figure 7 As shown, in this embodiment, the included angle α is 150°. The distance between the two vertical parts 341 is L2, and the minimum distance between the two inclined parts 342 is L1.

[0068] Of course, in other embodiments, the guide can also be configured to be inclined inward from bottom to top.

[0069] In one embodiment, both the front side plate 32 and the rear side plate 311 have two symmetrical guide bosses 34 protruding inwards, forming guide elements. The guide bosses 34 are integrally formed with the front side plate 32 and the outer side plate 31, which is easy to process and has high forming precision.

[0070] like Figure 9 and Figure 10 As shown, the smoke hood 1 includes a smoke hood body 12 and a chimney 11. The chimney 11 is located on top of the smoke hood body 12, and its outlet is an air outlet 111. Two guide plates 14 are provided on opposite sides of the smoke hood body 12. Both guide plates 14 are inclined upwards towards the center of the smoke hood body 12 along the height direction, and their tops form a ventilation opening. A baffle plate 13 is provided between the ventilation opening and the air outlet 111. The baffle plate 13 is a V-shaped plate with its opening facing upwards, used to prevent backflow of air from outside the smoke hood body 12.

[0071] When the burner 4 is burning, a negative pressure is generated inside the combustion chamber and the smoke hood 12. Under the action of atmospheric pressure, a negative pressure suction zone 15 is formed in the middle area between the two guide plates 14 inside the smoke hood 12. A suction force is generated inside the smoke hood 12, which causes cold air to flow in from the air inlet 3611, flow through the first airflow channel 100, the second airflow channel 200 and the inner cavity 300 of the smoke hood 1, and finally flow out from the air outlet 111.

[0072] The above description is only a preferred embodiment of this utility model. For those skilled in the art, there will be changes in the specific implementation method and application scope based on the idea of ​​this utility model. The content of this specification should not be construed as a limitation of this utility model.

Claims

1. A gas-fired water heater, comprising a smoke hood (1), a heat exchanger (2), and a combustion chamber shell (3), wherein the smoke hood (1) is connected to the upper end of the heat exchanger (2), and the lower end of the heat exchanger (2) is connected to the combustion chamber shell (3), characterized in that, The combustion chamber shell (3) has an inner shell and an outer shell (30), a first airflow channel (100) is formed between the inner shell and the outer shell (30), and a second airflow channel (200) is formed between the outer shell (30) and the heat exchanger (2); The bottom of the combustion chamber housing (3) is provided with an air inlet (3611) that communicates with the first airflow channel (100); The air inlet (3611), the first airflow channel (100), the second airflow channel (200), and the inner cavity (300) of the smoke hood (1) are connected in sequence.

2. The gas water heater of claim 1, wherein, The outer shell (30) has four side walls, and the inner shell includes four heat insulation plates (33). Each side wall is provided with a corresponding heat insulation plate (33). Each heat insulation plate (33) and its corresponding side wall form a first airflow channel (100) that surrounds and communicates with the other side. The bottom of each of the four sidewalls is provided with an air inlet (3611).

3. The gas water heater of claim 2, wherein, The outer casing (30) has a front side plate (32) and a rear side plate (311) disposed opposite to each other; A second airflow channel (200) is formed between the front side plate (32) and the heat exchanger (2), and between the rear side plate (311) and the heat exchanger (2); The front and rear sides of the heat exchanger (2) are both in contact with the corresponding sidewall of the heat insulation plate (33).

4. The gas water heater of claim 3, wherein, The upper ends of the front side plate (32) and the rear side plate (311) are both bent inward to form a first limiting plate (37), the first limiting plate (37) includes a first horizontal plate (371) and a first vertical plate (372); The first vertical plate (372) forms a second airflow channel (200) between itself and the heat exchanger (2), and the first horizontal plate (371) and the top wall of the corresponding heat insulation plate (33) form a connecting channel (400) connecting the first airflow channel (100) and the second airflow channel (200).

5. The gas water heater of claim 4, wherein, The smoke hood (1) is placed on the outside of the first vertical plate (372) and connected to the first horizontal plate (371).

6. The gas water heater of claim 3, wherein, The inner wall of the front side plate (32) and the inner wall of the rear side plate (311) are each provided with two symmetrically arranged guide members, and the distance between the two guide members is set to be narrower at the top and wider at the bottom.

7. The gas water heater of claim 6, wherein, The guide includes a vertical part (341) and an inclined part (342) arranged at an angle, the inclined part (342) being located above the vertical part (341), and the angle being 120° to 165°.

8. The gas water heater of claim 6, wherein, Both the front side plate (32) and the rear side plate (311) are internally convexly formed with two symmetrical flow guide bosses (34), which form the flow guide.

9. The gas water heater according to claim 2 or 3, wherein, Each of the four side walls is provided with a first support boss (35), and the heat exchanger (2) and the first support boss (35) clamp and fix the upper part of the heat insulation plate (33).

10. The gas water heater of claim 9, wherein, The height of the first support boss (35) is 2mm to 5mm.

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