Fireproof check valve

Abstract

The utility model relates to a fireproof check valve. The fireproof check valve comprises an opening capable of opening and closing a valve seat and a valve plate unit used for achieving directional circulation and sealing functions with a valve body. The check valve is characterized in that the valve plate unit comprises a first valve plate and a second valve plate which are relatively independently pivoted on the valve body through a common pivot shaft, and a first elastic piece which can enable each valve plate to always have a trend of closing a corresponding opening of the valve plate is arranged on the pivot shaft, the first valve plate and / or the second valve plate are respectively provided with an acting part, and the acting parts can mutually apply acting force to open corresponding openings of the first valve plate and / or the second valve plate under the action of oil smoke, compared with the prior art, the range hood has the advantages that the acting parts are respectively arranged on the first valve plate and / or the second valve plate, so that the oil smoke can be effectively prevented from entering the range hood under the action of air pressure of the range hood; the force is transmitted to the first valve plate and / or the second valve plate, the opening force of the first valve plate or the second valve plate is increased, and the first valve plate and the second valve plate are opened synchronously.

Description

Technical Field

[0001] The utility model relates to a fireproof damper, in particular to a fireproof check valve used for a range hood flue. Background Art

[0002] The flue check valve is a valve used in the flue system to prevent flue backflow. It is usually set on the flue system. For example, in the exhaust structure of the kitchen, a flue check valve is set on the air outlet of the range hood to prevent the oil smoke sucked out from the range hood from returning to the kitchen through the flue. The existing flue check valve usually works on the principle of hinged connection with the flue outlet. When the exhaust system discharges the oil smoke through the flue, the pressure generated by the flow of oil smoke in the flue is used to lift the flue check valve, so that the flue check valve rotates relative to the flue outlet, thereby opening the outlet and allowing the oil smoke to be discharged from the flue outlet. After all the oil smoke is discharged, the pressure disappears, and the flue check valve returns to the position before rotation by its own gravity or the elastic force of the first elastic member, thereby closing the flue outlet.

[0003] Ordinary flue check valves close the valve opening through a rotatable valve plate. Existing patents include "A flue fire check valve with double valve plates" with patent number ZL201711086467.2. The check valve is formed by installing a first gear and a second gear that mesh with each other at the ends of the first valve plate shaft and the second valve plate shaft. Although the first valve plate and the second valve plate can be opened and closed at the same time, the gears of the valve plate shafts of the first valve plate and the second valve plate are easily stained with oil, so that the first valve plate and / or the second valve plate are stuck during the rotation process, so that only a part of the valve plate can be opened, and it cannot be fully opened synchronously or cannot be fully returned to its original position, thereby affecting the ventilation effect and the effect of preventing smoke backflow within the same period of time. Utility Model Content

[0004] The technical problem to be solved by the utility model is to provide a fire-proof check valve suitable for double valve plates and synchronously opening the valve plates in view of the above-mentioned existing technical status.

[0005] The technical solution adopted by the utility model to solve the above-mentioned technical problems is as follows: the fireproof check valve includes a valve plate unit, which is constructed to open and close the opening of the valve seat to achieve directional flow and sealing functions with the valve body; it is characterized in that: the valve plate unit includes a first valve plate and a second valve plate which are relatively independently pivoted to the valve body through a common pivot axis, and a first elastic member is arranged on the pivot axis, which can enable each valve plate to always have a tendency to close its corresponding opening, wherein the first valve plate and / or the second valve plate are also respectively provided with an action part which can exert a force on each other to open their corresponding openings under the action of oil smoke.

[0006] In order to avoid that when one of the valve plates is stuck with oil and the range hood is opened, the forces on the two valve plates are inconsistent, preferably, a prying position is provided on the acting part of the second valve plate, and the acting part on the first valve plate can slide along the acting part on the second valve plate under the action of oil and smoke. When the first valve plate is moved to the prying position, the first valve plate can apply force to the second valve plate to pry the second valve plate and cause the two valve plates to rotate synchronously to open.

[0007] In order to make the first valve disc and the second valve disc be in a flush position when they move away from each other to close the opening of the valve seat, preferably, the action portion of the second valve disc includes a horizontal section for the first valve disc to slide and a support wall inclined at an angle α relative to the horizontal plane of the horizontal section, and the end of the support wall in the horizontal section corresponds to the prying position. The angle α can be selected as 90°, and of course, the inclined support arm can be inclined at a greater angle than 90° or less than 90°.

[0008] In order to achieve the interaction between the first valve disc and the second valve disc and exert force on each other, from the perspective of simple structure, preferably, the action part of the first valve disc is a plate-shaped pressing plate, the lower surface of the pressing plate is against the horizontal section of the action part of the second valve disc, and when the free end of the pressing plate slides to the end of the horizontal section of the second valve disc, the first valve disc can use the end as a fulcrum to apply force to the second valve disc, thereby prying the second valve disc and causing the two to rotate and open synchronously. Under the action of the air pressure of the range hood, the force is transmitted to the first valve disc, and after sliding along the horizontal section of the second valve disc to its end, the opening force of the second valve disc is increased, so that the second valve disc is pried and the two rotate and open synchronously, and vice versa, so as to achieve the purpose of synchronous opening of the first valve disc and the second valve disc.

[0009] In order to increase the force exerted by the first valve plate and the second valve plate on each other, preferably, the acting parts are provided with two groups, the acting parts provided on the first valve plate have the same structure as the acting parts of the second valve plate, and the acting parts provided on the second valve plate also have the same structure as the acting parts of the first valve plate, and the two groups are symmetrically distributed.

[0010] In order to speed up the opening and closing speed of the valve seat by the first valve disc and the second valve disc, preferably, the first valve disc and the second valve disc are both provided with a pivot seat that can pivot around the pivot axis, and the pivot axis is provided with a rotating body between adjacent pivot seats to strengthen the relative pivoting of the two.

[0011] In order to avoid the problem that the pivotal seat between the valve plate unit and the valve seat is easily stained with oil, preferably, it also includes:

[0012] The valve body has an inlet end for the oil smoke to flow in and an outlet end for the oil smoke to flow out;

[0013] a valve seat disposed in the valve body adjacent to the inlet end and having an opening in fluid communication with the inlet end and the outlet end; and

[0014] The blocking chamber is arranged on the valve body, and the blocking chamber can at least partially surround the pivoting part of the valve plate unit and the valve seat to prevent oil stains from adhering to the pivoting part.

[0015] By providing a blocking chamber in the valve body, the pivot point between the valve plate unit and the valve seat can be at least partially surrounded therein to prevent oil stains from adhering to the pivot point, thereby avoiding the valve plate unit from getting stuck during rotation, or being able to only partially open but not fully open or fully return to its original position during use, thereby improving the ventilation effect and the effect of preventing smoke backflow of the fire check valve.

[0016] From the perspective of blocking, a simpler way is that at least one wall portion of the blocking chamber is provided with sockets for inserting two ends of the pivot axis of the valve plate unit.

[0017] When the temperature in the flue is too high, in order to prevent the fire from spreading, preferably, the valve body is provided with a fixed bracket at the edge of the valve seat, and a forced closing member, a second elastic member acting on the forced closing member, and a fuse assembly are installed on the fixed bracket. When the fuse assembly is in an unfused state, the forced closing member is limited on the fuse assembly and detached from the valve plate, and when the fuse assembly is in a fused state, the forced closing member detaches from the fuse assembly and forces the valve plate to close under the action of the second elastic member.

[0018] In order to facilitate the forced closing member to forcefully close the valve plate under the action of the second elastic member, preferably, the forced closing member is rod-shaped, and sliding brackets for the forced closing member to slide are respectively provided on both sides of the fixed bracket.

[0019] Compared with the prior art, the advantage of the utility model is that: since the first valve plate and / or the second valve plate are respectively provided with an acting part, under the action of the wind pressure of the range hood, the force is transmitted to the first valve plate and / or the second valve plate, thereby increasing the opening force of the first valve plate or the second valve plate, so that the first valve plate and the second valve plate can be opened synchronously. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic diagram of the structure of the fire-proof check valve in the embodiment of the utility model;

[0021] Figure 2 This is a schematic diagram of the structure of the first valve plate in the embodiment of the utility model;

[0022] Figure 3 It is a structural schematic diagram of the first valve disc and the second valve disc in the valve seat in the embodiment of the utility model in a closed state;

[0023] Figure 4 for Figure 3 Schematic diagram of the structure from another angle;

[0024] Figure 5 This is a diagram showing the interaction between the first valve plate and the second valve plate in an embodiment of the utility model;

[0025] Figure 6 for Figure 5 A magnified schematic diagram of center A. DETAILED DESCRIPTION

[0026] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0027] like Figures 1 to 6 The fireproof check valve of this embodiment includes a valve plate unit, which is configured to open and close the opening of the valve seat 8, and is used to achieve directional flow and sealing functions with the valve body 7; the valve plate unit includes a first valve plate 1 and a second valve plate 2 which are relatively independently pivoted to the valve body 7 through a common pivot shaft 4, and a first elastic member 3 is arranged on the pivot shaft 4 so that each valve plate always has a tendency to close its corresponding opening, wherein the first valve plate 1 and / or the second valve plate 2 are also respectively provided with an action part which can exert an action force to open the corresponding opening under the action of oil smoke, and since the first valve plate 1 and / or the second valve plate 2 are respectively provided with the action part, under the action of the wind pressure of the range hood, the force is transmitted to the first valve plate 1 and / or the second valve plate 2, thereby increasing the opening force of the first valve plate 1 or the second valve plate 2, so that the first valve plate 1 and the second valve plate 2 can achieve the purpose of synchronous opening. In order to increase the force exerted by the first valve plate 1 and the second valve plate 2 on each other, two groups of acting parts are provided. The acting part provided on the first valve plate 1 has the same structure as the acting part of the second valve plate 2, and the acting part provided on the second valve plate 2 has the same structure as the acting part of the first valve plate 1, and the two groups are symmetrically distributed.

[0028] Specifically, in order to prevent the two valve discs from being subjected to inconsistent forces when one of the valve discs is stuck by oil stains and the range hood is opened, a prying position 21 is provided on the action portion of the second valve disc 2, and the action portion of the first valve disc 1 can slide along the action portion of the second valve disc 2 under the action of oil smoke. When the first valve disc 1 moves to the prying position 21, the first valve disc 1 can apply force to the second valve disc 2, and the second valve disc 2 is pried and the two valve discs are synchronously rotated to open. The following description is given as an example;

[0029] The action part of the second valve disc 2 of this embodiment includes a horizontal section 22 for the first valve disc 1 to slide and a support wall 23 inclined at an angle α relative to the horizontal plane of the horizontal section 22, and the end of the support wall 23 in the horizontal section 22 corresponds to the prying position 21. The angle α can be selected as 90°, and of course the inclined support arm can be inclined at a greater angle than 90° or less than 90°. The purpose of this design is that when the first valve disc 1 and the second valve disc 2 are away from each other to close the opening of the valve seat 8, the two can be in a flush position, that is, the lower surface of the first valve disc 1 can be placed on the upper surface of the action part of the second valve disc 2. In order to achieve the interaction between the first valve disc 1 and the second valve disc 2 and exert force on each other, referring to the figure, the action part of the first valve disc 1 is a plate-shaped pressing plate 11, and the lower surface of the pressing plate 11 rests on the horizontal section 22 of the action part of the second valve disc 2. When the free end of the pressing plate 11 slides to the end of the horizontal section 22 of the second valve disc 2, the first valve disc 1 can use the end as a fulcrum to apply force to the second valve disc 2, thereby prying the second valve disc 2 and causing the two to rotate and open synchronously. Under the action of the air pressure of the range hood, the force is transmitted to the first valve disc 1, and after sliding along the horizontal section 22 of the second valve disc 2 to its end, the opening force of the second valve disc 2 is increased, so that the second valve disc 2 is pried and the two rotate and open synchronously, and vice versa, so as to achieve the purpose of synchronous opening of the first valve disc 1 and the second valve disc 2. In addition, in order to speed up the speed of the first valve disc 1 and the second valve disc 2 opening and closing the opening of the valve seat 8, the first valve disc 1 and the second valve disc 2 are both provided with a pivot seat 5 that can pivot around the pivot shaft 4, and the pivot shaft 4 is provided with a rotating body 6 between adjacent pivot seats 5 to strengthen the relative pivoting of the two. In order to avoid the problem that the pivot seat 5 between the valve disc unit and the valve seat 8 is easily stained with oil, the fire-proof check valve also includes a valve body 7 having an inlet end for oil smoke to flow in and an outlet end for oil smoke to flow out, a valve seat 8 disposed in the valve body 7 at a position adjacent to the inlet end and having an opening connected to the inlet end and the outlet end, and a blocking chamber 9 disposed on the valve body 7, the blocking chamber 9 can at least partially surround the pivot of the valve disc unit and the valve seat 8 to block oil from adhering to the pivot. By providing a barrier chamber 9 in the valve body 7, the pivot point between the valve plate unit and the valve seat 8 can be at least partially surrounded therein to prevent oil stains from adhering to the pivot point, thereby avoiding the valve plate unit from getting stuck during rotation, or being able to only partially open but not fully open or fully return to its original position during use, thereby improving the ventilation effect and the effect of preventing smoke backflow of the fire check valve, and at least one wall portion of the barrier chamber 9 is provided with a socket 91 for inserting the two ends of the pivot shaft 4 of the valve plate unit.

[0030] When the temperature in the flue is too high, in order to prevent the fire from spreading, preferably, the valve body 7 is provided with a fixed bracket 10 at the edge of the valve seat 8, and a forced closing member 20, a second elastic member 30 acting on the forced closing member 20 and a fuse assembly 40 are installed on the fixed bracket 10. When the fuse assembly 40 is in an unfused state, the forced closing member 20 is limited on the fuse assembly 40 and detached from the valve plate, and when the fuse assembly 40 is in a fused state, the forced closing member 20 detaches from the fuse assembly 40 and forces the valve plate to close under the action of the second elastic member 30.

[0031] Finally, in order to facilitate the forced closing member 20 to force the valve plate to close under the action of the second elastic member 30, the forced closing member 20 is in the shape of a rod, and sliding brackets 50 are respectively provided on both sides of the fixed bracket 10 for the forced closing member 20 to slide. In addition, the valve body 7 is also provided with an air guide cover at the outlet end for guiding oil smoke, and a fence structure is provided on the air guide cover. In addition, whether the valve plate unit is opened or closed, it is in the valve body 7 to reduce the risk of being damaged. The valve body 7 is sealed with the valve seat 8 and the air guide cover through a rubber ring.

[0032] In summary, the working process of the fire check valve is as follows: first, the fire check valve is installed on the wall and its installation position is adjusted; when the fire check valve is opened, the first valve plate 1 and the second valve plate 2 are forced to open and discharge the oil smoke under the action of the oil smoke, and when the fire check valve is closed, the first valve plate 1 and the second valve plate 2 fall back on the valve seat 8 obliquely by their own gravity and the action of the first elastic member 3; when the temperature in the flue is too high, the fuse assembly 40 is melted, and the forced closing member 20 is forced to close the first valve plate 1 and the second valve plate 2 under the action of the second elastic member 30 to prevent the spread of fire; if when the first valve plate 1 and the second valve plate 2 are opened, one of them is stuck due to oil stains, such as the second valve plate 2, the free end of the pressure plate 11 of the first valve plate 1 can be slid to the end of the horizontal section 22 of the second valve plate 2, and the first valve plate 1 can use the end as a fulcrum to apply force to the second valve plate 2, and pry the second valve plate 2 and cause the two to rotate synchronously to open.

Claims

1. A fire-proof check valve, comprising a valve plate unit, the valve plate unit being configured to open and close an opening of a valve seat (8) for achieving directional flow and sealing functions with a valve body (7); characterized in that: The valve plate unit comprises a first valve plate (1) and a second valve plate (2) which are relatively independently pivoted to a valve body (7) via a common pivot shaft (4), and a first elastic member (3) is arranged on the pivot shaft (4) so ​​that each valve plate always has a tendency to close its corresponding opening, wherein the first valve plate (1) and / or the second valve plate (2) are also respectively provided with an action part which can exert a force on each other to open their corresponding openings under the action of oil smoke.

2. The fireproof check valve according to claim 1, characterized in that: The acting portion on the second valve plate (2) is provided with a prying position (21), and the acting portion on the first valve plate (1) can slide along the acting portion on the second valve plate (2) under the action of oil smoke. When the first valve plate (1) moves to the prying position (21), the first valve plate (1) can exert force on the second valve plate (2), thereby prying the second valve plate (2) and causing the two to rotate synchronously to open.

3. The fire-proof check valve according to claim 2, characterized in that: The action portion of the second valve plate (2) comprises a horizontal section (22) for the first valve plate (1) to slide, and a supporting wall (23) inclined at an angle α relative to the horizontal plane of the horizontal section (22), and the end of the supporting wall (23) in the horizontal section (22) corresponds to the prying position (21).

4. The fire-proof check valve according to claim 3, characterized in that: The working part of the first valve plate (1) is a plate-shaped pressure plate (11), and the lower surface of the pressure plate (11) rests on the horizontal section (22) of the working part of the second valve plate (2). When the free end of the pressure plate (11) slides to the end of the horizontal section (22) of the second valve plate (2), the first valve plate (1) can use the end as a fulcrum to apply force to the second valve plate (2), thereby prying the second valve plate (2) and causing the two to rotate synchronously to open.

5. The fire-proof check valve according to claim 4, characterized in that: The action parts are provided in two groups, the action parts provided on the first valve plate (1) have the same structure as the action parts of the second valve plate (2), and the two groups are symmetrically distributed.

6. The fire check valve according to any one of claims 1 to 5, characterized in that: The first valve plate (1) and the second valve plate (2) are both provided with a pivot seat (5) capable of pivoting around the pivot shaft (4), and the pivot shaft (4) is provided with a rotating body (6) between adjacent pivot seats (5) to strengthen the relative pivoting of the two.

7. The fire-proof check valve according to claim 6, characterized in that: Also included are: The valve body (7) has an inlet end for the oil smoke to flow in and an outlet end for the oil smoke to flow out; a valve seat (8) disposed in the valve body (7) at a position adjacent to the inlet end and having an opening in fluid communication with the inlet end and the outlet end; as well as The blocking chamber (9) is arranged on the valve body (7), and the blocking chamber (9) can at least partially surround the pivot point between the valve plate unit and the valve seat (8) to prevent oil stains from adhering to the pivot point.

8. The fire-proof check valve according to claim 7, characterized in that: At least one wall portion of the barrier chamber (9) is provided with a socket (91) for inserting two ends of the pivot shaft (4) of the valve plate unit.

9. The fire-proof check valve according to claim 8, characterized in that: The valve body (7) is provided with a fixed bracket (10) at the edge of the valve seat (8), and a forced closing member (20), a second elastic member (30) acting on the forced closing member (20), and a fuse assembly (40) are installed on the fixed bracket (10). When the fuse assembly (40) is in an unfused state, the forced closing member (20) is limited on the fuse assembly (40) and detached from the valve plate, and when the fuse assembly (40) is in a fused state, the forced closing member (20) is detached from the fuse assembly (40) and forced to close the valve plate under the action of the second elastic member (30).

10. The fire-proof check valve according to claim 9, characterized in that: The forced closing member (20) is rod-shaped, and sliding brackets (50) capable of allowing the forced closing member (20) to slide are respectively provided on both sides of the fixed bracket (10).

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