CN216667989U - Prevent down-draught subassembly and water heater that has it - Google Patents

Abstract

The utility model discloses a down draft prevention assembly and a water heater with the same, wherein the down draft prevention assembly comprises: a smoke exhaust pipe; an annular support mounted on the smoke exhaust duct, the annular support defining an air exit; a wind deflector configured to be turnably provided in the smoke exhaust pipe between an open position and a closed position around a rotation shaft to conduct the air passing opening in a single direction; the crossbeam, the crossbeam is established the pivot below, the surface towards the air inlet direction of crossbeam is equipped with and falls and hinders the face, it hinders the face to fall to be constructed as the width from top to bottom and reduces gradually. The anti-downdraft assembly provided by the embodiment of the utility model has the advantages of good anti-downdraft effect, small smoke discharge resistance and the like.

Description

Prevent down-draught subassembly and water heater that has it

Technical Field

The utility model relates to the technical field of electric appliance manufacturing, in particular to a down-draft prevention assembly and a water heater with the down-draft prevention assembly.

Background

In the gas water heater in the related art, in order to exhaust the burned flue gas, the exhaust pipe needs to be extended out of the room, and in order to avoid backflow of cold air, a turnable wind shield is arranged in the exhaust system, so that the flue gas is only allowed to be discharged in one direction, and the backflow is prevented. But the pivot joint department of deep bead easily produces great gap, leads to outside cold wind still to get into, prevents down the wind effect poor.

SUMMERY OF THE UTILITY MODEL

The present invention is directed to solving at least one of the problems of the prior art. Therefore, the utility model provides the anti-downdraft assembly which has the advantages of good anti-downdraft effect, small smoke discharge resistance and the like.

The utility model also provides a water heater with the anti-downdraft assembly.

To achieve the above object, an embodiment according to a first aspect of the present invention provides a down draft prevention assembly, including: a smoke exhaust pipe; an annular support mounted on the smoke exhaust duct, the annular support defining an air exit; a wind deflector configured to be turnably provided in the smoke exhaust pipe between an open position and a closed position around a rotation shaft to conduct the air passing opening in a single direction; the crossbeam, the crossbeam is established the pivot below, the surface towards the air inlet direction of crossbeam is equipped with and falls and hinders the face, it hinders the face to fall to be constructed as the width from top to bottom and reduces gradually.

The anti-downdraft assembly provided by the embodiment of the utility model has the advantages of good anti-downdraft effect, small smoke discharge resistance and the like.

In addition, the anti-downdraft assembly according to the above embodiment of the present invention may further have the following additional technical features:

according to one embodiment of the utility model, the resistance reducing surface is arc-shaped or V-shaped in a section perpendicular to the length direction of the cross beam, so that an avoiding groove is formed in the upper surface of the cross beam, the rotating shaft is matched in the avoiding groove, a sleeve is arranged on the wind shield, and the sleeve is sleeved on the rotating shaft.

According to one embodiment of the utility model, the cross beam is arranged along the diameter of the smoke exhaust pipe, and the cross beam and the annular bracket are integrally formed.

According to one embodiment of the utility model, the projection of the rotation axis in the horizontal plane falls within the projection of the crossbeam in the horizontal plane.

According to one embodiment of the present invention, both ends of the rotation shaft are connected to the inner circumferential surface of the ring bracket.

According to one embodiment of the utility model, the annular support comprises an installation section attached to the smoke exhaust pipe and an annular rib bent towards the center of the smoke exhaust pipe, and the wind shield is in lap joint with the annular rib when in a closed position.

According to one embodiment of the utility model, the ring-shaped bracket is further provided with a stop lug, and the wind deflector stops against the stop lug in the open position.

According to one embodiment of the utility model, the wind deflectors are two semicircular plates, the linear edges of the two wind deflectors are arranged on the rotating shaft in a turnover manner, and concave surfaces which face away from the air outlet direction are arranged on the wind deflectors.

According to one embodiment of the utility model, the smoke exhaust pipe comprises a straight pipe section and a bent pipe section, and the annular support is arranged on the straight pipe section.

According to one embodiment of the utility model, the width of the cross beam is 4-10 mm.

Embodiments according to the second aspect of the utility model provide a water heater comprising an anti-downdraft assembly according to embodiments of the first aspect of the utility model.

According to the water heater provided by the embodiment of the utility model, the down-draft prevention assembly provided by the embodiment of the first aspect of the utility model has the advantages of good down-draft prevention effect, small smoke discharge resistance and the like.

Additional aspects and advantages of the utility model will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the utility model.

Drawings

The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:

FIG. 1 is a schematic view of a portion of a down draft prevention assembly according to an embodiment of the present invention.

FIG. 2 is a partial schematic structural view of a down draft prevention assembly according to an embodiment of the present invention.

Fig. 3 is a schematic partial structural view of a down draft prevention assembly according to another embodiment of the present invention.

FIG. 4 is a schematic view of a partial structure of a smoke exhaust duct according to an embodiment of the present invention.

FIG. 5 is an exploded view of a smoke exhaust duct according to an embodiment of the present invention.

FIG. 6 is a schematic view of a partial structure of a smoke exhaust duct according to an embodiment of the present invention.

Reference numerals: the smoke exhaust pipe comprises a smoke exhaust pipe 1, an inlet straight pipe section 10, an expansion section 11, an upper pipe portion 12, a lower pipe portion 13, a bent pipe section 20, an anti-backflow assembly 100, an air passing opening 101, an annular support 110, an annular rib 111, an upper flanging 112, a limiting lug 113, a rotating shaft hole 114, an installation section 115, a rotating shaft 120, a wind shield 130, a sleeve 131, a concave surface 132, a cross beam 140, a resistance reducing surface 141 and an avoiding groove 142.

Detailed Description

The present application is based on the discovery and recognition by the inventors of the following facts and problems:

in the gas water heater in the related art, in order to exhaust the burned flue gas, the exhaust pipe needs to be extended out of the room, and in order to avoid backflow of cold air, a turnable wind shield is arranged in the exhaust system, so that the flue gas is only allowed to be discharged in one direction, and the backflow is prevented. But the pivot joint department of deep bead easily produces great gap, leads to outside cold wind still to get into, prevents down the wind effect poor.

Therefore, the cross beam is arranged at the pivot joint of the wind shield of the partial anti-downdraft assembly, cold air in the gap of the wind shield joint is blocked by the cross beam, the ventilation area of the cross beam during smoke discharge can be influenced, the air exhaust resistance is increased, the combustion effect of the gas water heater is influenced, the combustion sufficiency is influenced, and the generation of carbon monoxide is increased.

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention and are not to be construed as limiting the present invention.

In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the utility model and to simplify the description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be considered limiting of the utility model. Furthermore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

A down draft prevention assembly 100 according to an embodiment of the present invention is described below with reference to the accompanying drawings.

As shown in fig. 1 to 6, the anti-downdraft assembly 100 according to the embodiment of the present invention includes a smoke exhaust pipe 1, and a ring bracket 110, a rotating shaft 120, a wind guard 130 and a cross member 140 mounted on the smoke exhaust pipe 1.

The annular support 110 defines the air outlet 101. The wind deflector 130 is configured to be reversibly disposed within the smoke evacuation pipe between an open position and a closed position about a rotation axis to conduct the air flow opening 101 in a single direction. The cross beam 140 is disposed below the rotating shaft 120, and a surface of the cross beam 140 facing the air intake direction is provided with a resistance reducing surface 141, and the resistance reducing surface 141 is configured such that a width thereof is gradually reduced from top to bottom.

In other words, the annular bracket 110 has the air passing opening 101 therein. Both ends of the rotation shaft 120 are connected to the inner circumferential surface of the ring bracket 110. The wind guard 130 is mounted on the rotating shaft 120 in a reversible manner, and the wind guard 130 is configured to conduct the air passing opening 101 from bottom to top in a single direction (the up-down direction is shown by an arrow in the figure and is only for convenience of description, and is not limited to the actual arrangement direction). The cross beam 140 is disposed below the rotating shaft 120, and the lower surface of the cross beam 140 is provided with a resistance reducing surface 141, and the resistance reducing surface 141 is configured to have a width gradually increasing from bottom to top.

As will be understood by those skilled in the art, the phrase "the wind deflector 130 is configured to unidirectionally conduct the air flow through the air flow opening 101 from bottom to top" means that the wind deflector 130 only allows the air flow from bottom to top to pass through the air flow opening 101. In other words, the wind deflector 130 opens the air passage 101 when the air flow flows from bottom to top and the wind deflector 130 covers the air passage 101 when the air flow flows from top to bottom. The down draft prevention function of the down draft prevention assembly 100 can be realized thereby.

The "width of the resistance-reducing surface 141" is relative to its length. In other words, it means a dimension perpendicular to its longitudinal direction in the horizontal plane.

Specifically, the anti-backflow assembly 100 is connected to the exhaust path of the gas water heater, such as at the smoke outlet of the body, in the exhaust duct, between the exhaust duct and the body, etc. When the gas water heater is normally combusted to discharge smoke, the discharged smoke passes through the anti-downdraft assembly 100 from bottom to top, and pushes the wind shield 130, so that the wind shield 130 opens the air inlet 101. When the gas water heater is not discharging smoke, the air passing opening 101 is closed by the air baffle 130, so that external cold air is prevented from flowing backwards from top to bottom.

According to the anti-downdraft assembly 100 provided by the embodiment of the utility model, the anti-downdraft function can be realized by arranging the wind shield 130 which is in one-way conduction with the air inlet 101.

Because the wind shield 130 is connected with the ring-shaped support 110 through the rotating shaft 120 in an overturning manner, a gap is easily formed at the rotating shaft 120, and thus, external cold air can still flow backwards.

Through setting up crossbeam 140, compare the subassembly that prevents down draught among the correlation technique, can utilize crossbeam 140 to shelter from the gap that deep bead 130 produced in pivot 120 department, reduce the outside cold wind that flows backward through this gap to improve the subassembly 100 that prevents down draught's the effect of preventing down draught.

Further, by providing the resistance reducing surface 141 on the lower surface of the cross beam 140, the resistance reducing surface 141 is configured to gradually increase in width from the bottom to the top. Therefore, when smoke is normally discharged, the airflow is guided by the resistance reducing surface 141 when passing through the cross beam 140 from bottom to top, the influence of the cross beam 140 on smoke discharge resistance can be reduced, and compared with a cross beam without the resistance reducing surface 141 in the prior art, the smoke discharge resistance can be reduced, the combustion effect of the water heater is improved, and the generation of carbon monoxide is reduced.

Therefore, the anti-downdraft assembly 100 according to the embodiment of the utility model has the advantages of good anti-downdraft effect, small smoke discharge resistance and the like.

A down draft prevention assembly 100 according to an embodiment of the present invention is described below with reference to the accompanying drawings.

In some embodiments of the present invention, as shown in fig. 1-6, a down draft prevention assembly 100 according to an embodiment of the present invention includes a ring bracket 110, a rotation shaft 120, a wind deflector 130, and a cross member 140.

In one embodiment of the present invention, the resistance reducing surface 141 is curved in a cross-section perpendicular to the length of the beam 140, as shown in fig. 3. Therefore, the arc-shaped surface can be used for forming the resistance reducing surface 141, and the airflow is guided by the arc-shaped surface when passing through the cross beam 140 from bottom to top, so that the airflow resistance is reduced.

In one embodiment of the present invention, the resistance-reducing surface 141 is V-shaped in a cross-section perpendicular to the length direction of the beam 140, as shown in fig. 2. Therefore, the resistance reducing surface 141 can be formed by the V-shaped surface, and when the airflow passes through the cross beam 140 from bottom to top, the airflow is guided by the V-shaped surface, so that the airflow resistance is reduced.

Advantageously, as shown in fig. 1, the projection of the rotation axis 120 in the horizontal plane falls within the projection of the beam 140 in the horizontal plane. Therefore, the shielding effect of the cross beam 140 on the gap at the rotating shaft 120 can be improved, and air leakage at the gap can be further reduced.

Advantageously, the shaft 120 is disposed parallel to the beam 140, as shown in fig. 1. Therefore, the shielding effect of the cross beam 140 on the gap at the rotating shaft 120 can be improved, and air leakage at the gap can be further reduced.

Specifically, as shown in fig. 1, a sleeve 131 is disposed on the wind deflector 130, the sleeve 131 is sleeved on the rotating shaft 120, an avoiding groove 142 is disposed on the upper surface of the cross beam 140, and the sleeve 131 is fitted in the avoiding groove 142. Therefore, the turning arrangement of the wind shield 130 is facilitated, the sealing performance can be further improved, the air leakage is reduced, and the anti-downdraft effect of the anti-downdraft assembly 100 is improved.

More specifically, as shown in fig. 1 to 3, the ring bracket 110 includes a mounting section 115 attached to the smoke exhaust pipe 1, and a ring rib 111 bent toward the center of the smoke exhaust pipe 1, and the wind shield 130 is overlapped on the ring rib 111 in the closed position.

In other words, the wind deflector 130 is provided on the rotary shaft 120 so as to be turnable between an open position and a closed position, the annular bracket 110 is provided at an inner peripheral surface thereof with an annular rib 111 and a stopper lug 113, the wind deflector 130 is supported on the annular rib 111 in the closed position, and the wind deflector 130 abuts against the stopper lug 113 in the open position. Therefore, the overturning limit position of the wind deflector 130 can be limited by the annular rib 111 and the limiting lug 113, so that the wind deflector 130 can keep the sealing of the air passing opening 101 in the closing position, and the situation that the wind deflector 130 cannot be reset due to the fact that the wind deflector 130 is overturned excessively can be avoided. In addition, the snap fit of the annular rib 111 and the wind deflector 130 may improve the sealing of the anti-wind down assembly 100 when the wind deflector 130 is in the closed position.

Specifically, as shown in fig. 1-3, the inner edge of the annular rib 111 also has an upturn 112. The wind deflector 130 is supported on the upturn 112 in the closed position. This not only improves the sealing of the damper 130 in the closed position, but also reduces the wind resistance of the anti-wind down assembly 100.

As shown in fig. 1-3, the two limiting lugs 113 may be located above the two ends of the rotating shaft 120. This may facilitate defining the open position of the wind deflector 130.

Alternatively, as shown in fig. 1-3, the cross beam 140 is oriented along the diameter of the ring bracket 110, the wind deflectors 130 are two and semicircular plates, and the linear edges of the two wind deflectors 130 are mounted on the rotating shaft 120 in a turnable manner. Therefore, the wind deflector 130 can be turned conveniently, and the wind deflector 130 is prevented from being difficult to turn flexibly due to the fact that the wind deflector 130 is too large in size.

Furthermore, a concave surface 132 facing away from the air outlet direction is disposed on the wind deflector 130. Thereby, the sealing effect of the wind deflector 130 can be improved.

Specifically, as shown in fig. 1, each wind deflector 130 is provided with a plurality of bushings 131, the plurality of bushings 131 are provided at intervals along the straight side of the wind deflector 130, and the bushings 131 of the two wind deflectors 130 are offset from each other. Therefore, the installation of the wind shield 130 can be facilitated, the gap of the rotating shaft 120 can be reduced, and the anti-downdraft effect is further improved.

In one specific example of the utility model, the width of the beam 140 is 4-10 millimeters. It will be understood by those skilled in the art that the "width of the beam 140" is relative to its length. In other words, it means a dimension perpendicular to its longitudinal direction in the horizontal plane. Therefore, the influence of the cross beam 140 on the ventilation area of the air inlet 101 can be reduced under the condition of ensuring the shielding effect of the cross beam 140 on the gap at the position of the rotating shaft 120, and the influence of the cross beam 140 on the air exhaust resistance is reduced.

Specifically, as shown in fig. 2 and 3, two rotating shaft holes 114 may be formed in the annular bracket 110, and both ends of the rotating shaft 120 may be respectively fitted into the two rotating shaft holes 114. This may facilitate the installation of the hinge 120.

The ring support 110 and the cross beam 140 may be a unitary piece. Specifically, the same plate material may be bent. This may facilitate manufacture of the down draft prevention assembly 100.

The anti-downdraft assembly 100 can be arranged in the smoke exhaust pipe 1 of the gas water heater.

The smoke exhaust pipe 1 comprises a bend pipe section 20, an inlet straight pipe section 10 and an anti-downdraft assembly 100. The inlet straight section 10 is connected at its upper end to the elbow section 20 and at its lower end adapted to be removably connected to the smoke outlet of the water heater. The anti-backflow component 100 is arranged in the inlet straight pipe section 10, the anti-backflow component 100 is connected with the inner wall of the inlet straight pipe section 10, and the anti-backflow component 100 is constructed in a mode that the inlet straight pipe section 10 is communicated in a one-way mode from bottom to top.

It should be understood here that the smoke exhaust pipe 1 is arranged outside the water heater body, and is detachably connected with the smoke exhaust port of the water heater or the smoke exhaust pipe is arranged on the water heater body and is connected with the smoke exhaust outlet of the smoke collecting stove of the water heater, that is, the smoke exhaust pipe can be a smoke exhaust pipe section outside the water heater body or a smoke exhaust pipe section anti-downdraft assembly 100 of the water heater body structure is arranged in the inlet straight pipe section 10 of the smoke exhaust pipe 1, and the smoke exhaust pipe 1 does not form a part of a smoke exhaust duct in the gas water heater body, but is connected with the smoke exhaust pipe 1 outside the air exhaust port of the gas water heater body.

In other words, the anti-backflow assembly 100 is integrated into the smoke exhaust pipe 1, not into the smoke exhaust of the gas water heater, nor is it a separate structure connected between the smoke exhaust pipe 1 and the smoke exhaust.

According to the smoke exhaust pipe 1 provided by the embodiment of the utility model, the anti-downdraft assembly 100 is arranged in the inlet straight pipe section 10, compared with the anti-downdraft assembly integrated in the body of the gas water heater in the related art, if the anti-downdraft assembly 100 is damaged or blocked, the anti-downdraft assembly 100 can be replaced by replacing the smoke exhaust pipe 1, the gas water heater does not need to be integrally replaced, or the gas water heater is dismounted and replaced, so that the maintenance and the replacement of the anti-downdraft assembly 100 can be facilitated, and the maintenance cost of the gas water heater is reduced.

And, through setting up anti-downdraft subassembly 100 in import straight tube section 10, compare the independent anti-downdraft structure of connecting between tub and the fuselage of discharging fume among the relevant art, utilize the closing of tub 1 of discharging fume and anti-downdraft subassembly 100 to form anti-downdraft structure jointly, need not independent manufacturing and installation, can practice thrift material and installation cost.

That is, in the present preferred embodiment, the smoke exhaust pipe 1 can save the installation, material and maintenance costs of the anti-back wind component 100 by integrating the anti-back wind component 100 into the smoke exhaust pipe 1, instead of integrating the anti-back wind structure into the water heater body, or connecting the separate structure between the smoke exhaust pipe and the smoke exhaust port.

In addition, through setting up down draught prevention subassembly 100 in import straight tube section 10, compare the technical scheme who sets up in bend section or exit, can be convenient for down draught prevention subassembly 100's setting, improve down draught prevention effect.

Advantageously, as shown in figures 4-6, the inlet straight tube section 10 is formed with an expanded section 11 projecting radially outwards, the anti-downdraft assembly being mounted in the expanded section 11. This may facilitate installation of the down draft prevention assembly 100.

In one embodiment of the utility model, as shown in figure 6, the inlet straight tube section 10 is a one-piece member. Therefore, the sealing performance of the smoke exhaust pipe 1 can be improved conveniently, and the assembly process of the smoke exhaust pipe 1 is simplified.

In another embodiment of the present invention, as shown in fig. 5, the inlet straight pipe section 10 comprises an upper pipe portion 12 and a lower pipe portion 13, the upper pipe portion 12 is connected with the lower pipe portion 13 in a plugging manner, and the anti-downdraft assembly 100 is installed at the connection position of the upper pipe portion 12 and the lower pipe portion 13. This may facilitate installation of the down draft prevention assembly 100.

Specifically, the anti-downdraft assembly 100 may be further connected to the inner wall of the inlet straight pipe section 10 by welding after being installed in place. Thus, the sealing performance of the smoke exhaust pipe 1 can be further ensured.

Specifically, as shown in fig. 5 and 6, the elbow section 20 is a bellows. Therefore, the mobility of the elbow section 20 can be improved conveniently, and the smoke exhaust pipe 1 can be installed and connected conveniently.

More specifically, as shown in fig. 5 and 6, the smoke exhaust pipe 1 further comprises an outlet straight pipe section 30, and the outlet straight pipe section 30 is connected with one end of the elbow section 20 far away from the inlet straight pipe section 10. This facilitates the installation and connection of the smoke exhaust pipe 1.

Optionally, the outlet straight tube section 30 is 60-80mm in length. The minimum diameter of the smoke exhaust pipe 1 is 60-80mm, and the length of the inlet straight pipe section 10 is 60-85 mm. Thus, the size of the smoke exhaust pipe 1 is more reasonable, and the installation of the anti-downdraft assembly 100 is facilitated.

A water heater according to an embodiment of the present invention is described below. A water heater according to an embodiment of the present invention includes a down draft prevention assembly 100 according to the above-described embodiment of the present invention.

According to the water heater of the embodiment of the utility model, by utilizing the anti-downdraft assembly 100 of the embodiment of the utility model, the advantages of good anti-downdraft effect, small smoke resistance and the like are achieved.

Specifically, the water heater is a gas water heater.

Other constructions and operations of water heaters according to embodiments of the present invention are known to those of ordinary skill in the art and will not be described in detail herein.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an illustrative embodiment," "an example," "a specific example," or "some examples" or the like mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the utility model. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

While embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the utility model, the scope of which is defined by the claims and their equivalents.

Claims (11)

1. A down draft prevention assembly, comprising:

a smoke exhaust pipe;

an annular support mounted on the smoke exhaust duct, the annular support defining an air exit;

a wind deflector configured to be turnably provided in the smoke exhaust pipe between an open position and a closed position around a rotation shaft to conduct the air passing opening in a single direction;

the crossbeam, the crossbeam is established the pivot below, the crossbeam is equipped with towards the surface of air inlet direction and falls and hinder the face, it hinders the face to fall to be constructed as the width from top to bottom and reduces gradually.

2. The anti-downdraft assembly according to claim 1, wherein the resistance reducing surface is arc-shaped or V-shaped in a cross section perpendicular to the length direction of the cross beam so as to form an avoiding groove in the upper surface of the cross beam, the rotating shaft is fitted in the avoiding groove, a sleeve is arranged on the wind deflector, and the sleeve is sleeved on the rotating shaft.

3. The anti-downdraft assembly of claim 1, wherein the cross beam is disposed along a diameter of the smoke exhaust pipe, the cross beam being integrally formed with the annular support.

4. The anti-downdraft assembly according to claim 1, wherein a projection of the rotating shaft in a horizontal plane falls within a projection of the cross beam in a horizontal plane.

5. The anti-downdraft assembly according to claim 1, wherein both ends of the rotating shaft are connected to an inner circumferential surface of the annular bracket.

6. The anti-downdraft assembly according to claim 1, wherein the annular support comprises a mounting section attached to the smoke exhaust pipe and an annular rib bent towards the center of the smoke exhaust pipe, and the wind shield is in lap joint with the annular rib in the closed position.

7. The anti-downdraft assembly according to claim 1, wherein the annular bracket is further provided with a stop lug thereon, the wind deflector stopping against the stop lug in the open position.

8. The anti-downdraft assembly according to claim 1, wherein the wind deflectors are two semicircular plates, linear edges of the two wind deflectors are rotatably mounted on the rotating shaft, and concave surfaces recessed in a direction away from the wind outlet direction are formed in the wind deflectors.

9. The anti-downdraft assembly of claim 1, wherein the smoke exhaust tube comprises a straight tube section and a bent tube section, and the annular brace is disposed on the straight tube section.

10. The anti-downdraft assembly of claim 1, wherein the width of the cross beam is 4-10 millimeters.

11. A water heater comprising the down draft prevention assembly according to any one of claims 1 to 10.

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