Smoke discharging device for gas water heater and gas water heater

Abstract

This utility model discloses a flue gas device for gas water heaters and a gas water heater, belonging to the field of home appliance technology, and is designed to solve the problem of slow reset speed of existing anti-reverse butterfly plates. The flue gas device for gas water heaters disclosed in this utility model includes an anti-backflow component, which includes: a bracket with a flue gas passage hole; a rotating shaft; and a flap, which is hinged to the bracket via the rotating shaft and can swing around the shaft. The flap can block and open the flue gas passage hole. The flap includes a flap body and a recessed groove, the recessed groove being located in the flap body and protruding in the direction of blocking the flue gas passage hole. When the thrust of the flue gas flow in the flue gas passage hole is less than a set value, the recessed groove allows the flap to swing in the direction of blocking the flue gas passage hole. In the flue gas device for gas water heaters and gas water heaters disclosed in this utility model, the flap includes a recessed groove, which allows the flap to quickly swing in the direction of blocking the flue gas passage hole, and the flap can tightly engage with the flue gas passage hole, enhancing the sealing performance.

Description

Technical Field

[0001] This utility model relates to the field of home appliance technology, and in particular to a flue gas exhaust device for gas water heaters and a gas water heater. Background Technology

[0002] Gas water heaters utilize the heat generated by the combustion of combustible gas. Cold water exchanges heat with this gas to form hot water for user consumption. The combustion of combustible gas produces exhaust gases, which must be promptly vented outdoors to prevent any adverse health effects on users.

[0003] Existing gas water heaters are equipped with a connected exhaust hood and exhaust pipe. The exhaust gases produced by the combustion of combustible gas are collected by the exhaust hood and then discharged outdoors through the exhaust pipe. This means the exhaust pipe is connected to the outdoor space. Regardless of whether the gas water heater is in operation, the internal components of the gas water heater are connected to the outdoor space through the exhaust pipe. Insects, dust, impurities, and other foreign objects may enter the gas water heater through the exhaust pipe. When the outdoor temperature is low, cold air may flow back into the gas water heater through the exhaust pipe, causing the heat exchanger and other components inside the gas water heater to freeze and be damaged, shortening the service life of the gas water heater.

[0004] To address the aforementioned issues, some existing gas water heaters are equipped with a backflow preventer butterfly plate on their exhaust pipes. When the gas water heater is operating, exhaust gas is ejected through the exhaust pipe. At this time, the backflow preventer butterfly plate is lifted by the airflow, leaving the exhaust pipe open and allowing for normal exhaust gas discharge. After the gas water heater stops operating, the backflow preventer butterfly plate returns to its original position under its own weight, blocking the exhaust pipe in the exhaust pipe and preventing foreign objects and cold air from entering the gas water heater through the exhaust pipe. However, the existing structure has drawbacks: the backflow preventer butterfly plate resets slowly, and gaps easily form between the reset butterfly plate and the exhaust pipe, resulting in poor sealing and making it difficult to completely prevent foreign objects and cold air from entering the gas water heater through the exhaust pipe, leading to a poor user experience. Utility Model Content

[0005] The purpose of this utility model is to propose a flue gas device and a gas water heater, which solves the problem of slow reset speed of the existing anti-reverse butterfly plate and has good sealing performance.

[0006] To achieve this objective, the present invention adopts the following technical solution:

[0007] A flue gas exhaust device for a gas water heater includes an anti-backflow component. The anti-backflow component includes: a bracket with an exhaust port; a rotating shaft; and a flap hinged to the bracket via the rotating shaft and capable of rotating around the rotating shaft. The flap can block and open the exhaust port. The flap includes a flap body and a recessed groove. The recessed groove is located in the flap body and protrudes in the direction of blocking the exhaust port. When the thrust of the flue gas flow in the exhaust port is less than a set value, the recessed groove allows the flap to rotate in the direction of blocking the exhaust port.

[0008] In one preferred embodiment, the bracket includes a cylindrical sidewall, the bottom edge of which is bent inward to form an annular bottom edge, and the smoke exhaust hole is located within the bottom edge; the sidewall has two hinged through holes for the rotating shaft to pass through, and when the flap blocks the smoke exhaust hole, the flap body abuts against the bottom edge, and the recessed groove is located in the smoke exhaust hole.

[0009] In one preferred embodiment, the bracket further includes a limiting plate, one end of which is connected to the side wall, and the other end of which extends radially inward along the side wall. The limiting plate and the bottom edge are located on opposite sides of the hinged through hole.

[0010] In one preferred embodiment, the anti-backflow assembly includes two semi-circular flaps, the edges of the two flap bodies are respectively curled to form hinged tubes for passing through the rotating shaft, and the hinged tubes of the two flaps are staggered.

[0011] In one preferred embodiment, the bracket further includes a support portion, and the two hinged through holes are respectively located at both ends of the support portion, and the hinged tube can abut against the support portion.

[0012] In one preferred embodiment, the rotating shaft is interference-fitted with the hinge tube.

[0013] In one preferred embodiment, a relief recess is formed by a radial inward recess on the sidewall, and the hinged through hole is disposed on the relief recess.

[0014] In one preferred embodiment, the distance between the two hinged through holes is less than the length of the rotating shaft and less than the outer diameter of the sidewall.

[0015] In one preferred embodiment, the smoke exhaust device further includes a smoke exhaust pipe, a limiting protrusion ring is formed on the inner wall of the smoke exhaust pipe, the bracket passes through the smoke exhaust pipe and abuts against the limiting protrusion ring, and the smoke exhaust through hole communicates with the smoke exhaust channel inside the smoke exhaust pipe.

[0016] On the other hand, the present invention adopts the following technical solution:

[0017] A gas water heater includes a fume hood with a through hole. The gas water heater also includes the aforementioned gas water heater exhaust device, which is connected to the fume hood, and the exhaust hole communicates with the through hole.

[0018] The flue plate of the exhaust device for gas water heaters disclosed in this utility model includes a recessed groove that protrudes towards the direction of blocking the exhaust vent. When the flue plate is in the upward-tilted state, the recessed groove lowers the center of gravity of the flue plate and moves it further away from the pivot, thus giving the flue plate greater resetting potential energy. When the thrust of the flue gas flow in the exhaust vent is less than a set value, the recessed groove allows the flue plate to quickly swing towards the direction of blocking the exhaust vent and quickly reset. Moreover, the flue plate can tightly engage with the exhaust vent, enhancing the seal and ensuring that foreign objects and cold air do not enter the gas water heater through the exhaust vent, resulting in a better user experience.

[0019] The gas water heater disclosed in this utility model includes the above-mentioned exhaust device for gas water heaters. The structure of the flap has been improved. The addition of a sinking trough does not affect the normal emission of exhaust gas, ensures sealing, and improves the reset speed of the flap. Attached Figure Description

[0020] Figure 1 This is a structural schematic diagram of a gas water heater provided in a specific embodiment of this utility model;

[0021] Figure 2 This is an exploded view of the smoke exhaust device provided in a specific embodiment of this utility model;

[0022] Figure 3 This is a schematic diagram of the combined structure of two flaps provided in a specific embodiment of this utility model;

[0023] Figure 4 This is a schematic diagram of the structure of the flap provided in a specific embodiment of this utility model;

[0024] Figure 5 This is a schematic diagram of the structure of the bracket provided in a specific embodiment of this utility model.

[0025] In the picture:

[0026] 1. Bracket; 2. Rotating shaft; 3. Flip plate; 4. Exhaust pipe; 5. Exhaust hood; 11. Exhaust hole; 12. Side wall; 13. Bottom edge; 14. Hinge hole; 15. Limiting plate; 16. Support part; 17. Avoidance recess; 31. Flip plate body; 32. Sinking groove; 33. Hinge pipe; 41. Limiting protrusion ring; 51. Cover hole. Detailed Implementation

[0027] To make the above-mentioned objectives, features, and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a full understanding of this utility model. However, this utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this utility model. Therefore, this utility model is not limited to the specific embodiments disclosed below.

[0028] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0029] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0030] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., 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, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0031] In this utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0032] It should be noted that when an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0033] This embodiment discloses a flue gas device for a gas water heater and a gas water heater including the flue gas device, such as Figure 1 As shown, the gas water heater includes a fume hood 5, and a fume extraction device is connected to the fume hood 5. For example... Figures 2 to 4 As shown, the exhaust device for a gas water heater includes an anti-backflow component, which comprises a bracket 1, a rotating shaft 2, and a flap 3. The bracket 1 has an exhaust port 11, and the exhaust hood 5 has a hood through-hole 51, which are connected. The flap 3 is hinged to the bracket 1 via the rotating shaft 2 and can rotate around the shaft 2. The flap 3 can both block and open the exhaust port 11.

[0034] The flap 3 includes a flap body 31 and a recessed groove 32. The recessed groove 32 is located in the flap body 31 and protrudes towards the direction of blocking the exhaust vent 11. When the flap 3 is in the flipped-up state, the recessed groove 32 makes the center of gravity of the flap 3 lower and farther away from the pivot 2, so the flap 3 has a greater restoring potential energy. When the thrust of the flue gas flow in the exhaust vent 11 is less than a set value, the recessed groove 32 can make the flap 3 quickly swing towards the direction of blocking the exhaust vent 11, and the flap 3 can be tightly fastened to the exhaust vent 11, enhancing the sealing performance and ensuring that foreign objects and cold air will not enter the gas water heater through the exhaust vent 11, resulting in a better user experience.

[0035] The anti-backflow component improves the structure of the flap 3 by adding a recessed groove 32, which does not affect the normal emission of exhaust gas and ensures sealing. Specifically, when the gas water heater is working, exhaust gas is ejected through the exhaust hole 11, and the flap 3 is lifted up to an inclined upward state by the exhaust gas. At this time, the recessed groove 32 separates from the edge of the exhaust hole 11, and does not obstruct the emission of exhaust gas. When the gas water heater is in standby mode, there is no longer any push from the exhaust gas on the flap 3. Under its own weight, the flap 3 returns to its original position. The recessed groove 32 speeds up the return of the flap 3 and makes the fit between the flap 3 and the exhaust hole 11 tighter.

[0036] Based on the above structure, the smoke exhaust device also includes a smoke exhaust stack 4, the bottom end of which is connected to a through hole 51 on the smoke exhaust hood 5. The smoke exhaust through hole 11 connects to the smoke exhaust channel inside the smoke exhaust stack 4, and the exhaust gas is discharged outdoors after passing through the smoke exhaust hood 5, the smoke exhaust stack 4, and the smoke exhaust through hole 11.

[0037] A limiting protrusion ring 41 is formed on the inner wall of the exhaust pipe 4. The bracket 1 passes through the exhaust pipe 4 and abuts against the limiting protrusion ring 41. The limiting protrusion ring 41 can limit the position of the bracket 1, improving assembly efficiency. The bracket 1 can be installed inside the exhaust pipe 4 and abut against the limiting protrusion ring 41, which provides a certain supporting force to the bracket 1, making the installation of the bracket 1 more stable. The bracket 1 can also be installed inside the exhaust pipe 4 and located below the limiting protrusion ring 41, as long as the limiting protrusion ring 41 does not affect the flipping and resetting of the flap 3.

[0038] The specific connection method between the bracket 1 and the exhaust pipe 4 is not limited, as long as it can ensure a stable connection between the two without gaps. In this embodiment, the bracket 1 is installed inside the exhaust pipe 4 and located below the limiting protrusion ring 41. The periphery of the bracket 1 is spot-welded to the inner wall of the exhaust pipe 4, resulting in a stable connection structure, high processing efficiency, and good sealing performance.

[0039] The specific shape of the flap 3 is not limited, as long as it can open and close the smoke exhaust vent 11. In this embodiment, for example... Figure 2 and Figure 4 As shown, the anti-backflow component includes two semi-circular flaps 3, which together form a circular structure. When exhaust gas is discharged, the two flaps 3 can flip up to open the exhaust vent 11; when there is no exhaust gas to be discharged, the two flaps 3 can reset to close the exhaust vent 11.

[0040] The edges of the two flap bodies 31 are respectively curled to form hinge tubes 33 for the rotating shaft 2 to pass through. The hinge tubes 33 of the two flaps 3 are staggered. The rotating shaft 2 passes through the hinge tubes 33 of the two flap bodies 31 in sequence, thereby connecting the two flap bodies 31 together. The two flap bodies 31 can swing around the rotating shaft 2 respectively. When one flap body 31 is stuck and cannot be flipped up or reset, it does not affect the normal swing of the other flap body 31.

[0041] To prevent the flap body 31 from swinging around the pivot 2 while simultaneously moving radially along the pivot 2, in this embodiment, the pivot 2 and the hinge tube 33 are interference-fitted. The flap body 31 can swing stably around the pivot 2 without radial movement, resulting in more stable spatial posture, lower noise, and better sealing.

[0042] The specific structure of the bracket 1 is not limited, as long as it can stably support the flip plate 3. In this embodiment, for example... Figure 5 As shown, the bracket 1 includes a connected sidewall 12 and a bottom edge 13, wherein the sidewall 12 is cylindrical and the bottom edge 13 is annular. The bottom edge 13 bends and extends from the bottom edge of the sidewall 12 toward the interior of the sidewall 12, and the smoke exhaust hole 11 is located within the bottom edge 13.

[0043] Based on the above structure, two recesses 17 are formed radially inward on the sidewall 12, and the two recesses 17 are symmetrically arranged with respect to the center of the sidewall 12. A hinged through hole 14 is provided in the recess 17, such as... Figure 2 and Figure 5 As shown, the rotating shaft 2 passes through a hinged through hole 14 and connects the two flaps 3 together, and then passes through another hinged through hole 14 to realize the hinge connection between the flaps 3 and the bracket 1.

[0044] The recess 17 is recessed relative to the outer wall of the bracket 1. In this embodiment, the distance between the two hinged through holes 14 is less than the length of the pivot 2 and less than the outer diameter of the side wall 12. Both ends of the pivot 2 can be inserted into the hinged through holes 14 without coming out, ensuring the stability of the installation structure of the flap 3. Both ends of the pivot 2 will not protrude from the bracket 1, avoiding affecting the tight fit between the bracket 1 and the exhaust pipe 4, and avoiding the flap 3 from getting stuck when it swings due to friction between the end of the pivot 2 and the inner wall of the exhaust pipe 4, resulting in a better user experience.

[0045] Based on the above structure, the bracket 1 also includes a limiting plate 15. One end of the limiting plate 15 is connected to the side wall 12, and the other end of the limiting plate 15 extends radially inward along the side wall 12. The limiting plate 15 and the bottom edge 13 are located on opposite sides of the hinged through hole 14. After assembly, the end of the rotating shaft 2 is located below the limiting plate 15, and the maximum angle at which the flip plate 3 flips up is against the side of the limiting plate 15. This prevents the flip plate 3 from being lifted up by the exhaust gas and standing upright, and prevents it from failing to reset under its own weight due to being upright, making it more convenient to use.

[0046] To prevent the connection between the two flaps 3 from collapsing, in this embodiment, the bracket 1 further includes a strip-shaped support portion 16, which radially penetrates the smoke exhaust hole 11. Two hinged holes 14 are located at opposite ends of the support portion 16, and the rotating shaft 2 is parallel to the support portion 16. After assembly, the hinged tubes 33 of both flaps 3 can abut against the support portion 16, preventing the hinged tubes 33 from moving downwards.

[0047] The specific shape of the sinking groove 32 and its sinking thickness relative to the flap body 31 are not limited, as long as the flap 3 can be reset more quickly and smoothly. In this embodiment, as shown... Figure 2 , Figure 3 and Figure 5 As shown, the flap body 31 is semi-circular, and the recessed groove 32 is also semi-circular and slightly smaller than the flap body 31. When the flap 3 blocks the smoke exhaust hole 11, the flap body 31 abuts against the bottom edge 13, and the recessed groove 32 is located in the smoke exhaust hole 11. The flap 3 fits more tightly with the bracket 1, resulting in better sealing.

[0048] like Figure 1 As shown, apart from the exhaust device and exhaust hood 5, the gas water heater also includes a heat exchanger, burner, gas distributor, fan, water flow sensor and proportional valve, etc. The above structures are the same as those in the prior art, and will not be described in detail here.

[0049] Note that the above description is merely a preferred embodiment of the present invention and the technical principles employed. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and various obvious changes, readjustments, and substitutions can be made without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments, and may include many other equivalent embodiments without departing from the concept of the present invention. The scope of the present invention is determined by the scope of the appended claims.

Claims

1. A flue gas exhaust device for a gas water heater, including an anti-backflow component, characterized in that, The backflow prevention component includes: A bracket (1) has a smoke exhaust hole (11) on it. Rotating shaft (2); and, The flap (3) is hinged to the bracket (1) via the pivot (2) and can swing around the pivot (2). The flap (3) can cover and open the smoke exhaust hole (11). The flap (3) includes a flap body (31) and a sinking groove (32). The sinking groove (32) is located in the flap body (31) and protrudes in the direction of covering the smoke exhaust hole (11). When the thrust of the smoke flow in the smoke exhaust hole (11) is less than a set value, the sinking groove (32) can make the flap (3) swing in the direction of covering the smoke exhaust hole (11).

2. The flue gas exhaust device for a gas water heater according to claim 1, characterized in that, The bracket (1) includes a cylindrical sidewall (12), the bottom edge of the sidewall (12) is bent toward the inside of the sidewall (12) to form an annular bottom edge (13), the smoke exhaust hole (11) is located in the enclosure of the bottom edge (13); the sidewall (12) is provided with two hinged through holes (14) for the shaft (2) to pass through, when the flap (3) blocks the smoke exhaust hole (11), the flap body (31) abuts against the bottom edge (13), and the sinking groove (32) is located in the smoke exhaust hole (11).

3. The flue gas exhaust device for a gas water heater according to claim 2, characterized in that, The bracket (1) also includes a limiting plate (15), one end of which is connected to the side wall (12), and the other end of which extends radially inward along the side wall (12). The limiting plate (15) and the bottom edge (13) are located on opposite sides of the hinged through hole (14).

4. The flue gas exhaust device for a gas water heater according to claim 3, characterized in that, The anti-backflow assembly includes two semi-circular flaps (3), the edges of the two flap bodies (31) are respectively curled to form hinge tubes (33) for passing through the rotating shaft (2), and the hinge tubes (33) of the two flaps (3) are staggered.

5. The flue gas exhaust device for a gas water heater according to claim 4, characterized in that, The bracket (1) also includes a support portion (16), with two hinged through holes (14) located at both ends of the support portion (16), and the hinged tube (33) abutting against the support portion (16).

6. The flue gas exhaust device for a gas water heater according to claim 4, characterized in that, The rotating shaft (2) is interference-fitted with the hinge tube (33).

7. The flue gas exhaust device for a gas water heater according to claim 3, characterized in that, The sidewall (12) is recessed radially inward to form a relief recess (17), and the hinged through hole (14) is provided on the relief recess (17).

8. The flue gas exhaust device for a gas water heater according to claim 7, characterized in that, The distance between the two hinged through holes (14) is less than the length of the shaft (2) and less than the outer diameter of the sidewall (12).

9. The flue gas exhaust device for a gas water heater according to any one of claims 1 to 8, characterized in that, The smoke exhaust device also includes a smoke exhaust pipe (4), a limiting protrusion ring (41) is formed on the inner wall of the smoke exhaust pipe (4), the bracket (1) passes through the smoke exhaust pipe (4) and abuts against the limiting protrusion ring (41), and the smoke exhaust through hole (11) is connected to the smoke exhaust channel inside the smoke exhaust pipe (4).

10. A gas water heater, comprising a fume hood (5), wherein the fume hood (5) has a through hole (51), characterized in that, The gas water heater further includes a gas water heater exhaust device as described in any one of claims 1 to 9, the exhaust device being connected to the exhaust hood (5), and the exhaust through hole (11) being connected to the hood through hole (51).

Images