A fireproof guiding check valve

Abstract

The present invention discloses a fireproof guiding check valve, which includes a valve body with double doors. Inside the valve body, there are valve plates symmetrically arranged with respect to a vertical beam. The valve body is installed at the front end of a diversion pipeline. The valve body further includes a temperature sensing device and a guiding plate. The temperature sensing device is installed on the valve body and includes a spring, a positioning shaft arranged on the valve body, two L-shaped connecting rods symmetrically arranged with respect to the vertical beam, and a fuse piece for fixing the connecting rods. There is a gap between the temperature sensing device and the valve plate. The temperature sensing device opens under the action of the spring according to the increase in temperature, so that the L-shaped connecting rods abut against the double-door valve plate. The guiding plate is arranged on one side of the valve body and is used to guide the flow direction of the gas entering the valve. In the present invention, when the temperature sensing device is closed, it has high stability. After the connecting rod is lowered, the locking method between the horizontal side and the valve plate makes the valve plate receive a large force and is not easily opened by the suction force of a large air volume, with high stability. At the same time, the temperature sensing device has a fast locking speed, good sealing performance, high structural strength and high safety.

Description

Technical Field

[0001] The invention relates to a check valve, in particular to a fire-proof guide check valve. Background Art

[0002] In the ventilation ducts of public places or in the smoke exhaust ducts of range hoods, check valves are usually installed to prevent the spread of high-temperature smoke in the event of a fire. The double-valve plate connecting rod type temperature sensing device has the advantages of small valve plate space and large air output during ventilation, and is often used in ventilation ducts or range hoods in public places. In the double-valve plate single spring connecting rod type temperature sensing device, the most critical structure is the temperature sensing device, that is, the device that locks the check valve plate according to the temperature of the pipeline air flow. Many check valve temperature sensing devices use spring thrust to lock the valve plate, but at high temperatures, the spring is prone to failure, causing the valve plate to open, causing the fire to spread further. At the same time, the existing temperature sensing device is not strong, and the temperature sensing device in the daily closed state will hinder the opening and closing of the valve plate, affecting the ventilation volume; the existing valve body structure cannot guide the wind direction. If it is set on a curved pipe with a change of direction, it is easy to cause problems such as air intake scouring, and it cannot meet the test rules under the new standard. Summary of the invention

[0003] Purpose of the invention: The present invention aims to provide a fire-proof check valve with high working efficiency, rapid locking and guiding function to solve the above problems.

[0004] Technical solution: The fireproof guide check valve of the present invention includes a double-door valve body, in which a valve plate symmetrically arranged about a vertical beam is arranged. The valve body is installed at the front end of the change-direction pipeline. The valve body also includes a temperature sensing device and a guide plate. The temperature sensing device is installed on the valve body, and includes a spring, a positioning shaft arranged on the valve body, two L-shaped connecting rods symmetrical about the vertical beam and a fuse fixing the connecting rod. There is a gap between the temperature sensing device and the valve plate. The temperature sensing device opens under the action of the spring according to the increase in temperature, so that the L-shaped connecting rod is against the double-door valve plate; the guide plate is arranged on one side of the valve body, and is used to guide the flow direction of the gas entering the valve.

[0005] The guide plate is arranged on the inner wall of the valve body, and includes a folded edge which has an included angle with the inner wall of the valve body, and the inclined direction of the folded edge faces the direction of the change-direction pipeline.

[0006] The guide plate is a cover-shaped structure arranged outside the valve body.

[0007] The valve sheet is formed by stamping and fixing two unit valve sheets, and the covering area of ​​the guide plate is smaller than half of the flow area of ​​the valve body.

[0008] The L-shaped connecting rod comprises a vertical side and a horizontal side, one end of the vertical side is connected to the positioning shaft through a fixed shaft, so that the connecting rod rotates around the fixed shaft; one end of the spring is connected to the L-shaped connecting rod, and the other end is connected to the distal end of the positioning shaft.

[0009] The positioning axis is parallel to the vertical beam.

[0010] The positioning shaft is provided with a fixing device, and the two ends of the fixing device are connected to the horizontal edges through fuse pieces respectively.

[0011] The valve plate is inclined relative to the side wall of the valve body, and the guide plate is arranged at one end where the angle between the valve plate and the side wall of the valve body is an obtuse angle.

[0012] The horizontal side of the L-shaped connecting rod faces the end where the angle between the valve plate and the side wall of the valve body is an acute angle.

[0013] A groove is arranged on the outer periphery of the valve plate to increase the strength of the valve plate.

[0014] Beneficial effects: Compared with the prior art, the present invention has the following significant advantages:

[0015] (1) When the check valve of the present invention is in normal use, the temperature sensing device occupies little space, which can ensure that the valve plate of the check valve can be opened to the maximum, and the ventilation volume of the valve body is maximum in the closed state. When the check valve is used in electrical appliances such as range hoods, the oil fume emission is greater.

[0016] (2) The valve body of the present invention has a guiding function and can be arranged in front of the direction-changing pipe to buffer the change in wind direction.

[0017] (3) The temperature sensing device of the present invention has high stability when closed. After the connecting rod is lowered, the locking method of the horizontal edge and the valve plate makes the valve plate subject to large force and is not easily opened by large air volume suction, thus having high stability. At the same time, the temperature sensing device has a fast locking speed, good sealing, high structural strength and high safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic diagram of the structure of Embodiment 1 of the present invention;

[0019] Figure 2 It is a structural schematic diagram of the temperature sensing device of the present invention;

[0020] Figure 3 This is a schematic diagram of the structure of Embodiment 2 of the present invention;

[0021] Figure 4 This is a schematic diagram of the structure of Embodiment 3 of the present invention;

[0022] Figure 5 It is a schematic diagram of the normal use state of the present invention. DETAILED DESCRIPTION

[0023] The technical solution of the present invention is further described below in conjunction with the accompanying drawings.

[0024] like Figure 1As shown, the valve body 1 of the double door of the embodiment 1 of the present invention is provided with a valve plate 2 symmetrical about the vertical beam 10, and the valve body 1 is installed at the front end of the change-direction pipeline. The valve body 1 also includes a temperature sensing device and a guide plate 7. The valve plate 2 is stamped from a unit valve plate, which solves the problems of high cost, low connection strength and short service life caused by the rivet connection of the traditional valve plate, improves the service life of the valve plate, reduces the manufacturing cost and simplifies the manufacturing process. A groove is provided on the periphery of the valve plate 2 to increase the strength of the valve plate.

[0025] The temperature sensing device includes a positioning shaft 3, a spring 6, an L-shaped connecting rod 5 and a fixed shaft 8. Both ends of the positioning shaft 3 are connected to the valve body 1, are parallel to the vertical beam 7 and are located in the same vertical plane. A fixed shaft 8 is provided in the middle of the positioning shaft 3, and one end of the vertical side 51 of the L-shaped connecting rod 5 is connected to the fixed shaft 8, and the connecting rod can rotate around the fixed shaft 8. The transverse sides of the two connecting rods are perpendicular to the positioning shaft and face in the opposite direction of the positioning shaft 3. In this embodiment, two springs 6 are provided, one end of the spring is respectively connected to the two transverse sides, and the other end is connected to the far end of the positioning shaft. A fixing device 4 is also provided on the positioning shaft 3, and the two ends of the fixing device 4 are respectively connected to the two transverse sides by a fuse 9, so that when the valve is in normal use, the L-shaped connecting rod 5 is fixed to one end of the positioning shaft 3 and the spring 6 is in a stretched state.

[0026] A connector for reinforcement is provided between the two vertical rods 51 to prevent deformation of the connecting rod and to prevent the problem of asynchronism during the movement of the two connecting rods. The vertical side 51 of the L-shaped connecting rod 5 is inclined relative to the positioning shaft 3 in the horizontal direction. The inclination angle makes the horizontal side 52 abut against the valve plate 2 after opening. The width of the horizontal side should correspond to the width of the valve plate to ensure that the connecting rod does not contact the inner surface of the valve body when it falls, and can abut against the valve plate. The vertical side 51 of the L-shaped connecting rod 5 is inclined relative to the positioning shaft 3 in the vertical direction, so that when the check valve is in normal use, the horizontal side 52 is arranged below the positioning shaft 3, that is, arranged inside the check valve body 1.

[0027] The guide plate 7 is arranged on the inner wall of the valve body 1, and includes a folded edge 72 and a fixed edge 71 which are at an angle with the inner wall of the valve body 1. The fixed edge 71 is used to connect the guide plate 7 with the inner wall of the valve body 1. The folded edge 72 is inclined in the direction of the redirected pipeline, and is used to guide the incoming air into the redirected pipeline. In this embodiment, the guide plate 7 is symmetrical about the vertical beam 10, the installation height of the guide plate 7 is at a certain distance from the valve plate 2, and the angle between the folded edge 72 and the inner wall is an acute angle, so as to ensure that the valve plate 2 can be fully opened during the normal use of the valve body 1.

[0028] like Figure 3As shown, in Embodiment 2 of the present invention, the guide plate 7 may be a cover-shaped structure arranged outside the valve body 1, and the guide plate 7 is hemispherical, arc-shaped, or rectangular, etc. In this embodiment, the guide plate 7 is arranged in a direction opposite to the direction of the change-direction pipeline, and does not completely cover the flow area of ​​the incoming air, and preferably the covering area is less than half of the flow cross-sectional area.

[0029] like Figure 4 As shown, in the embodiment 3 of the present invention, the spring 6 is provided with a connecting piece, one end of which is connected to the connecting piece between the two vertical sides 51, and the other end is connected to the distal end of the positioning shaft, and the rest of the structure is the same as that of the embodiment 1. In the case where the size of the check valve body is small, the size and weight of the connecting rod are also small, and a single spring can pull it to move, so using a single spring also saves space.

[0030] The present invention is further described in conjunction with the working process: When the check valve is in normal use, the fuse piece fixes the connecting rod to one end of the positioning shaft, and the spring is in a stretched state. Figure 4 As shown, in normal use, the structure of the present invention does not affect the opening of the valve, and can ensure normal ventilation effect. When a fire occurs, the gas temperature rises, causing the fuse to melt, and the connecting rod is driven to rotate downward under the action of the spring restoring force, so that the horizontal side of the connecting rod finally abuts against the check valve plate after rotation.

Claims

1. A fire-proof guide check valve, comprising a double-door valve body (1), wherein a valve plate (2) symmetrically arranged about a vertical beam (10) is arranged in the valve body (1), It is characterized in that The valve body (1) is installed at the front end of the direction-changing pipeline, and the valve body (1) also includes a temperature sensing device and a guide plate (7); the temperature sensing device includes a spring (6), a positioning shaft (3) arranged on the valve body (1), two L-shaped connecting rods (5) symmetrical about the vertical beam (10), and a fuse (9) fixing the connecting rods, the L-shaped connecting rod (5) includes a vertical side (51) and a horizontal side (52), one end of the vertical side (51) is connected to the positioning shaft (3) through a fixed shaft (8), so that the connecting rod rotates around the fixed shaft (8); the spring (6) is One end is connected to an L-shaped connecting rod (5), and the other end is connected to the distal end of the positioning shaft (3). There is a gap between the temperature sensing device and the valve plate (2). The temperature sensing device opens under the action of the spring (6) according to the temperature increase, so that the L-shaped connecting rod (5) is pressed against the valve plate (2); the guide plate (7) is arranged on one side of the valve body (1) and is used to guide the flow direction of the gas entering the valve. The guide plate (7) is arranged on the inner wall of the valve body (1) and includes a folded edge (72) having an angle with the inner wall of the valve body (1), and the inclination direction of the folded edge (72) is toward the direction of the change-direction pipeline.

2. The fire-proof guide check valve according to claim 1, It is characterized in that The guide plate (7) is a cover-shaped structure arranged on the outside of the valve body (1).

3. The fire-proof guide check valve according to claim 1, It is characterized in that The valve sheet (2) is formed by stamping and fixing two unit valve sheets.

4. The fire-proof guide check valve according to claim 1, It is characterized in that The positioning axis (3) is parallel to the vertical beam.

5. The fire-proof guide check valve according to claim 1, It is characterized in that The positioning shaft (3) is provided with a fixing device (4), and both ends of the fixing device (4) are connected to the horizontal edge (52) via fuse pieces (9) respectively.

6. The fire-proof pilot check valve according to claim 1, It is characterized in that The valve plate (2) is inclined relative to the side wall of the valve body, and the guide plate is arranged at one end where the angle between the valve plate and the side wall of the valve body is an obtuse angle.

7. The fire-proof pilot check valve according to claim 6, It is characterized in that The horizontal side (52) of the L-shaped connecting rod (5) faces the end where the angle between the valve plate and the side wall of the valve body is an acute angle.

8. The fire-proof pilot check valve according to claim 1, It is characterized in that The outer periphery of the valve plate (2) is provided with a groove.

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