A kind of anti-backdraft smoke collecting hood for water heater

Abstract

The present invention relates to a smoke hood for preventing backflow of water heater, comprising a smoke hood (1), the smoke hood (1) being provided with an exhaust port (11) for connecting a smoke exhaust pipe (6), and a check valve (2); the feature is that the check valve (2) comprises a first valve plate (21) and a second valve plate (22) which can block the exhaust port (11) after docking, the first valve plate (21) and the second valve plate (22) being respectively hinged to one end of a first connecting rod (31) and a second connecting rod (32); a rotating member which can be driven to rotate by water flow is provided in a water inlet pipe (8) of the water heater, the rotating member drives the other ends of the first connecting rod (31) and the second connecting rod (32) to move up and down through a transmission assembly, thereby driving the first valve plate (21) and the second valve plate (22) to slide radially, and opening or closing the exhaust port (11). The present invention does not require additional energy consumption, and can completely block the exhaust port, thereby completely avoiding the phenomenon of backflow of outdoor airflow.

Description

Technical Field

[0001] The invention relates to the field of water heaters, in particular to an anti-backdraft smoke collecting hood for water heaters. Background Art

[0002] During the operation of the water heater, smoke exhaust is required. Usually, a smoke exhaust pipe is connected to the air outlet of the smoke hood, and the smoke is forced to be exhausted to the outdoors through the smoke exhaust pipe by a fan. Since the smoke exhaust pipe is connected to the outdoor environment, in order to prevent the outdoor wind from flowing back into the room through the smoke exhaust pipe when the water heater is not working, a check valve is usually installed in the existing smoke exhaust pipe.

[0003] As disclosed in CN202835516U, "A range hood with a check valve" comprises a smoke exhaust duct connected to the upper end of the range hood, a check valve being arranged at the mouth of the smoke exhaust duct, the check valve having the same cross-sectional shape as the smoke exhaust duct, comprising two semicircular valve plates butting against each other, the diameter edges of the two semicircular valve plates being hinged on a connecting shaft, the two ends of the connecting shaft being connected to the inner wall of the smoke exhaust duct; and a limit block is also arranged in the smoke exhaust duct to prevent the two valve plates from moving in the opposite direction.

[0004] When the water heater is working, the wind pressure generated by the rotation of the fan pushes the two valve plates to rotate in opposite directions, opening the smoke exhaust duct; when the water heater is not working, even if there is wind backflow into the smoke exhaust duct from the outdoor environment, the wind will not flow back because the valve plate can only rotate in one direction.

[0005] However, with the existing structure, since the smoke exhaust pipe is easily deformed and the turning space in the pipe is limited, a certain gap must be left between the valve plate and the inner wall of the pipe, otherwise the valve plate is easy to get stuck, which makes it impossible to completely prevent backflow, and some air can still enter the water heater; especially when the wind is strong, the backflow is still quite obvious. Summary of the invention

[0006] The technical problem to be solved by the present invention is to provide a backflow prevention smoke collecting hood for a water heater in view of the current state of the prior art, in which a valve plate can completely cover the air outlet, so as to completely avoid the occurrence of backflow.

[0007] The technical solution adopted by the present invention to solve the above technical problems is: the anti-backdraft smoke collecting hood for the water heater comprises a smoke collecting hood, the smoke collecting hood is provided with an exhaust port for connecting to a smoke exhaust pipe, and a check valve;

[0008] Features:

[0009] The check valve comprises a first valve plate and a second valve plate which can block the exhaust port after docking, and the first valve plate and the second valve plate are hinged to one end of a first connecting rod and a second connecting rod respectively;

[0010] A rotating part that can be driven to rotate by water flow is provided in the water inlet pipe of the water heater. The rotating part drives the other ends of the first connecting rod and the second connecting rod to move up and down through the transmission assembly, thereby driving the first valve plate and the second valve plate to slide radially to open or close the exhaust port.

[0011] Furthermore, a slide seat may be sleeved on the lead screw, the slide seat and the lead screw are in clearance fit, and the slide seat support is arranged on the nut. This structure makes the movement of the valve plate smoother, and the slide seat can be used as a mounting base for the two connecting rods, and can also be used as a counterweight when the nut moves down along the lead screw, so that the nut moves down more smoothly and quickly, so that the valve plate can quickly close the exhaust port.

[0012] In order to enable the two valve plates to seal the exhaust port when the exhaust port is closed, preferably, a folded edge folded outward is provided on the periphery of the inner end of the exhaust pipe connected to the exhaust port, and the folded edge is located in the smoke collecting hood and has a gap with the inner wall of the smoke collecting hood;

[0013] The first valve plate and the second valve plate both include a bottom plate, the edge of the bottom plate has a side wall extending upward, and the upper end edge of the side wall has a clamping edge folded inward; after the first valve plate and the second valve plate are closed, the clamping edges on the two valve plates are inserted into the gap, thereby sealing the exhaust port.

[0014] In order to make the movement of the valve plate smoother and more stable, a guide rail may be provided in the smoke collecting hood, and the first valve plate and the second valve plate are slidably limited on the guide rail.

[0015] Preferably, the guide rail is a sliding shaft, and the first valve plate and the second valve plate are both provided with sliding bearings; the guide rail is inserted into the sliding bearings. This structure makes the opening and closing action of the check valve smoother.

[0016] As a further improvement of the above solutions, preferably, the transmission assembly may include a ball screw and a base threadedly connected to the ball screw, and the other ends of the first connecting rod and the second connecting rod are hinged on the base;

[0017] The rotating member is drivingly connected to the ball screw;

[0018] The ball screw is connected to a bracket, and the bracket is connected to a peripheral position of the air outlet.

[0019] As a further improvement of the above solutions, a first limit block and a second limit block for limiting the moving range of the base may be provided on the ball screw;

[0020] A guide rod is further connected between the first limit block and the second limit block, and the base is slidably arranged on the guide rod. The guide rod is designed to cooperate with the two connecting rods to further prevent the base from rotating.

[0021] In the above schemes, preferably, the rotating member is coaxially connected to the first bevel gear, the first bevel gear meshes with the second bevel gear, and the second bevel gear is coaxially connected to the lead screw;

[0022] The rotating member is coaxially connected to the first bevel gear.

[0023] Preferably, the rotating part is a turbine. This structure is sensitive to water flow impact and has a high kinetic energy conversion rate.

[0024] Alternatively, the rotating member may further include a connecting shaft, a peripheral wall of which is connected to at least three connecting rods, each of which is connected to a spherical crown blade, and the openings of each blade are oriented in the same direction.

[0025] More preferably, the blades are in a hemispherical crown shape.

[0026] Compared with the prior art, the anti-backflow smoke collector hood for the water heater provided by the present invention sets the valve plate in the smoke collector hood, utilizes the kinetic energy of the water flow when the water heater is working, converts it into torque through the conversion part, drives the movement of the connecting rod, and thus drives the translation of the valve plate to open or close the exhaust port without additional energy consumption, and has good energy-saving and consumption-reducing effects, and avoids the movable space that must be reserved for the rotation of the valve plate in the prior art. The two valve plates can completely block the exhaust port when closed, and completely avoid the phenomenon of backflow of outdoor airflow. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a partial cross-sectional view of the assembly structure of Example 1 of the present invention (air outlet is open);

[0028] Figure 2 It is a longitudinal cross-sectional view of Embodiment 1 of the present invention (air outlet is opened);

[0029] Figure 3 It is a three-dimensional schematic diagram of the smoke exhaust pipe, check valve, connecting rod, transmission assembly, rotating part and part of the water pipe assembly structure in Example 1 of the present invention (the exhaust port is open);

[0030] Figure 4 It is a three-dimensional schematic diagram of the smoke exhaust pipe, check valve, connecting rod, transmission assembly, rotating part and part of the water pipe assembly structure in Example 1 of the present invention (the exhaust port is closed);

[0031] Figure 5 It is a partial schematic diagram of the assembly structure of the valve plate and the inlet end of the smoke exhaust pipe in Example 1 of the present invention.

[0032] Figure 6 It is a three-dimensional schematic diagram of the smoke exhaust duct, check valve, connecting rod, transmission component, rotating part and part of the water pipe assembly structure in Example 2 of the present invention (exhaust port is open). DETAILED DESCRIPTION

[0033] The present invention is further described in detail below with reference to the accompanying drawings.

[0034] Example 1

[0035] like Figure 1 As Figure 5 As shown, the anti-backdraft smoke collecting hood for the water heater includes:

[0036] The smoke collecting hood 1 is installed above the heat exchanger of the water heater and is a collection and buffer space for smoke to be discharged. The smoke collecting hood 1 is provided with an exhaust port 11 for connecting to the smoke exhaust pipe 6.

[0037] The smoke exhaust pipe 6 is connected to the exhaust port 11 and is a passage for the smoke exhausted from the exhaust port to be discharged outdoors. In this embodiment, the periphery of the inner end of the smoke exhaust pipe 6 connected to the exhaust port 11 is provided with an outwardly folded edge 61, and the folded edge 61 is accommodated in the smoke hood 1 and has a gap with the inner wall of the smoke hood (not shown in the figure).

[0038] The bracket 5 is connected to the inner wall of the smoke hood along the periphery of the air outlet 11 and serves as a connection basis for other components.

[0039] The check valve 2 is used to open or close the exhaust port 11 so that the smoke generated during operation can be discharged from the exhaust port, or to prevent the wind in the external environment from flowing back into the smoke hood from the smoke exhaust pipe when closed; it includes a first valve plate 21 and a second valve plate 22 that can block the exhaust port 11 after docking, and the first valve plate 21 and the second valve plate 22 both include a bottom plate 23, and the edge of the bottom plate 23 has an upwardly extending side wall 24, and the upper end edge of the side wall 24 has an inwardly folded clamping edge 25; after the first valve plate 21 and the second valve plate 22 are closed, the clamping edges 25 on the two valve plates are clamped into the gap 62, thereby sealing the exhaust port 11.

[0040] There are two guide rails 26, which are horizontally arranged in the smoke hood 1. This embodiment adopts a sliding shaft, and its two ends are respectively connected to the two opposite inner walls of the smoke hood 1. The bottom plates of the first valve plate 21 and the second valve plate 22 are both provided with sliding bearings 27. The two guide rails 26 are respectively inserted into the corresponding sliding bearings 27, so that the two valve plates are slidably limited on the guide rails 26.

[0041] There are two connecting rods, which respectively drive and connect the first valve plate 21 and the second valve plate 22; in this embodiment, the first connecting rod 31 is hinged on the bottom plate of the first valve plate, and the second connecting rod 32 is hinged on the bottom plate of the second valve plate 22; the other end of the first connecting rod and the second connecting rod is hinged on the base 42.

[0042] The transmission assembly 4 includes a ball screw 41 and a base 42 threadedly connected to the ball screw.

[0043] The rotating member is arranged in the water inlet pipe 8 of the water heater, and converts the kinetic energy of the water flow into torque under the impact of the water flow, driving the ball screw 41 to rotate; it includes a connecting shaft 71, the upper end of which is sealed and passes through the water pipe wall to drive the connecting ball screw 41; at least three connecting rods 72 are connected to the peripheral wall of the connecting shaft 71 accommodated in the water pipe 8, and each connecting rod 72 is connected to a spherical crown blade 73, and the opening direction of each blade is consistent. The crown plate 73 in this embodiment is a hemispherical crown.

[0044] There are two limit blocks, which are arranged on the ball screw 41 and are provided with a moving distance for the base 42; wherein the first limit block 45 is connected to the lower end of the screw 41, and the second limit block 46 is connected to the screw 41 near the exhaust port 11. Two guide rods 48 are also connected between the first limit block 45 and the second limit block 46, and the base 42 is slidably arranged on the two guide rods 48.

[0045] When the water heater is working, water flows into the water pipe, and the water flows impact the crown plates, pushing the crown plates to rotate. The crown plates rotate in sequence, driving the connecting shaft to drive the ball screw to rotate in place, and the base moves upward along the ball screw under the restriction of the two connecting rods and the guide rail, driving the lower ends of the first connecting rod and the second connecting rod to move upward, and the upper ends of the first connecting rod and the second connecting rod respectively drive the first valve plate and the second valve plate to translate backwards, thereby opening the exhaust port, and the smoke is discharged from the exhaust port and discharged to the outside through the smoke exhaust pipe.

[0046] When the water heater stops working, the rotating parts lose the driving force of the water flow, and the base moves downward along the ball screw under its own gravity, pulling the two connecting rods downward, driving the two valve plates to move in opposite directions and close the exhaust port. When the two valve plates are docked, the edge of the valve plate is inserted into the gap between the folded edge of the exhaust pipe and the inner wall of the smoke hood, thereby sealing the exhaust port. At this time, no matter how strong the outdoor wind is, the wind cannot flow back into the smoke hood.

[0047] Example 2

[0048] like Figure 6 As shown, the rotating part in this embodiment is a turbine 7, which is arranged in a water pipe 8.

[0049] The rotating member is coaxially connected to the first bevel gear 43 , the first bevel gear 43 is meshed with the second bevel gear 44 , and the second bevel gear 44 is connected to the rotating shaft 47 .

[0050] The upper end of the rotating shaft 47 is sealed and passes through the water pipe 8 to connect with the ball screw 41 .

[0051] When the water heater is working, water flow impacts the turbine to rotate, and the turbine transmits kinetic energy to the first bevel gear, the second bevel gear and the ball screw in sequence.

[0052] The rest of the contents are the same as those in Example 1.

Claims

1. A backflow prevention smoke collecting hood for a water heater, comprising a smoke collecting hood (1), wherein the smoke collecting hood (1) is provided with an exhaust port (11) for connecting to a smoke exhaust pipe (6), and a check valve (2); Features: The check valve (2) comprises a first valve plate (21) and a second valve plate (22) which can block the exhaust port (11) after being connected, and the first valve plate (21) and the second valve plate (22) are respectively hinged to one end of a first connecting rod (31) and a second connecting rod (32); A rotating part that can be driven to rotate by water flow is provided in the water inlet pipe (8) of the water heater, and the rotating part drives the other ends of the first connecting rod (31) and the second connecting rod (32) to move up and down through a transmission assembly, thereby driving the first valve plate (21) and the second valve plate (22) to slide radially, thereby opening or closing the exhaust port (11).

2. The anti-backdraft smoke collecting hood for water heater according to claim 1, characterized in that A folded edge (61) folded outward is provided on the periphery of the inner end of the smoke exhaust pipe (6) connected to the exhaust port (11); the folded edge (61) is located inside the smoke collecting hood (1) and has a gap (62) with the inner wall of the smoke collecting hood; The first valve plate (21) and the second valve plate (22) both comprise a bottom plate (23), the edge of the bottom plate (23) having a side wall (24) extending upward, the upper end edge of the side wall (24) having an inwardly folded clamping edge (25); after the first valve plate (21) and the second valve plate (22) are closed, the clamping edges (25) on the two valve plates are inserted into the gap, thereby sealing the exhaust port (11).

3. The anti-backdraft smoke collecting hood for water heater according to claim 2, characterized in that A guide rail (26) is provided in the smoke collecting hood (1), and the first valve plate (21) and the second valve plate (22) are slidably limited on the guide rail (26).

4. The anti-backdraft smoke collecting hood for a water heater according to claim 3, characterized in that The guide rail (26) is a sliding shaft, and the first valve plate (21) and the second valve plate (22) are both provided with sliding bearings (27); the guide rail (26) is inserted into the sliding bearings (27).

5. The anti-backdraft smoke collecting hood for a water heater according to any one of claims 1 to 4, characterized in that The transmission assembly comprises a ball screw (41) and a base (42) threadedly connected to the ball screw (41), and the other ends of the first connecting rod (31) and the second connecting rod (32) are hinged on the base (42); The rotating member is drivingly connected to the ball screw (41); The ball screw (41) is connected to a bracket (5), and the bracket (5) is connected to a peripheral position of the air outlet (11).

6. The anti-backdraft smoke collecting hood for water heater according to claim 5, characterized in that The ball screw (41) is provided with a first limit block (45) and a second limit block (46) for limiting the moving distance of the base (42); A guide rod (48) is also connected between the first limit block (45) and the second limit block (46), and the base (42) is slidably arranged on the guide rod (48).

7. The anti-backdraft smoke collecting hood for a water heater according to claim 5, characterized in that The rotating member is coaxially connected to a first bevel gear (43), the first bevel gear (43) is meshed with a second bevel gear (44), and the second bevel gear (44) is coaxially connected to the ball screw (41); The rotating member is coaxially connected to the first bevel gear (43).

8. The anti-backdraft smoke collecting hood for a water heater according to claim 5, characterized in that The rotating part is a turbine (7).

9. The anti-backdraft smoke collecting hood for a water heater according to claim 5, characterized in that The rotating member comprises a connecting shaft (71), and at least three connecting rods (72) are connected to the peripheral wall of the connecting shaft (71). Each of the connecting rods (72) is connected to a spherical crown blade (73), and the openings of each blade are in the same direction.

10. The anti-backdraft smoke collecting hood for a water heater according to claim 9, characterized in that The blade (73) is in the shape of a hemispherical crown.

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