A temperature-sensitive device for a check valve

Abstract

The present invention discloses a temperature-sensitive device for a check valve, which is installed inside the check valve body of a double-door. It includes a positioning shaft parallel to the symmetric center of the double-valve plate. Both ends of the positioning shaft are connected to the valve body. Two symmetric L-shaped connecting rods are provided on the positioning shaft. The L-shaped connecting rod includes a vertical side and a horizontal side. One end of the vertical side is connected to the positioning shaft through a fixed shaft, enabling the connecting rod to rotate 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. A fuse piece is provided at the end of the L-shaped connecting rod, such that when the valve is in normal use, the connecting rod is fixed to one end of the positioning shaft, and the spring is in a stretched state. The temperature-sensitive device of the present invention has high stability when closed. After the connecting rod is lowered, the locking method between the horizontal side and the valve plate causes the valve plate to receive a large force and is not easily opened by the suction force of a large air volume, resulting in high stability. At the same time, the temperature-sensitive device has a fast locking speed, good sealing performance, high structural strength, and high safety.

Description

Technical Field

[0001] The present invention relates to a temperature sensing device, and more particularly to a temperature sensing device for a check valve. Background Art

[0002] In the ventilation ducts of public places or in the exhaust ducts of range hoods, check valves are usually provided to prevent the spread of high-temperature flue gas in the event of a fire. The double-valve plate type link type temperature sensing device has the advantages of small space occupied by the valve plate and large air output during ventilation, and is often applied to the ventilation ducts of public places or range hoods. In the double-valve plate single-spring link type temperature sensing device, the most critical structure is the temperature sensing device, that is, a 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, resulting in the opening of the valve plate and further spread of the fire. At the same time, most of the single-spring link type temperature sensing devices have low strength, and the temperature sensing device will hinder the opening and closing of the valve plate in the normal closed state, affecting the ventilation volume. Summary of the Invention

[0003] Object of the Invention: The present invention aims to provide a check valve temperature sensing device with high working efficiency, rapid locking, small occupied space and high strength to solve the above problems.

[0004] Technical Solution: The check valve temperature sensing device of the present invention is installed inside the check valve body with double doors, and includes a positioning shaft parallel to the symmetric center of the double-door valve plate. Both ends of the positioning shaft are connected to the valve body. Two symmetric L-shaped links are provided on the positioning shaft. The L-shaped link includes 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 link rotates around the fixed shaft; one end of the spring is connected to the L-shaped link, and the other end is connected to the distal end of the positioning shaft; a fuse piece is provided at the end of the L-shaped link, so that the link is fixed to one end of the positioning shaft in the normal use state of the valve, and the spring is in a stretched state.

[0005] A fixing device is provided on the positioning shaft, and both ends of the fixing device are respectively connected to the horizontal sides of the two links through fuse pieces.

[0006] A connecting member is provided between the L-shaped links.

[0007] One end of the spring is connected to the connecting member, and the other end is connected to the distal end of the positioning shaft.

[0008] There is one spring, the connecting member is parallel to the horizontal side, and the spring is provided at the central position of the connecting member.

[0009] The vertical side is inclined relative to the positioning shaft in the horizontal direction, and the inclination angle is such that the opened horizontal side can abut against the double-door valve plate.

[0010] The vertical side is inclined relative to the positioning shaft in the vertical direction.

[0011] Beneficial effects: Compared with the prior art, the present invention has the following remarkable advantages:

[0012] (1) When the check valve of the present invention is in the normal use state, the temperature sensing device occupies less space, which can ensure that the valve disc of the check valve can be opened to the maximum, and the ventilation volume of the valve body is the largest in the closed state. When the check valve is applied to electrical appliances such as range hoods, the oil fume emission is greater.

[0013] (2) When the temperature sensing device of the present invention is closed, it has high stability. After the connecting rod is lowered, the locking method of the horizontal side and the valve disc makes the valve disc receive a large force and is not easily opened by the large air volume suction, with high stability; at the same time, the locking speed of the temperature sensing device is fast, the sealing performance is good, and the structural strength and safety are high. Description of the drawings

[0014] Figure 1 is a schematic structural diagram of the present invention installed on a check valve;

[0015] Figure 2 is a schematic structural diagram of the present invention;

[0016] Figure 3 is another schematic structural diagram of the present invention;

[0017] Figure 4 is a schematic diagram of the present invention in the normal use state. Detailed implementation manners

[0018] The technical solution of the present invention will be further described below with reference to the drawings.

[0019] The check valve body 1 and the double valve disc 2 installed inside the check valve body 1. The double-opening valve disc is symmetric about the vertical beam 10 provided on the valve body. The present invention is provided inside the valve body and includes a positioning shaft 3, a spring 6, an L-shaped connecting rod 5, and a fixed shaft 8, as Figure 1 、 2 shown.

[0020] Both ends of the positioning shaft 3 are connected to the valve body 1, parallel to the vertical beam 7 and located in the same vertical plane. A fixed shaft 8 is provided in the middle of the positioning shaft 3. 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 horizontal sides of the two connecting rods are perpendicular to the positioning shaft and face the direction opposite to the positioning shaft 3. In this embodiment, there are two springs 6. One end of each spring is respectively connected to the two horizontal sides, and the other end is connected to the distal end of the positioning shaft. A fixing device 4 is also provided on the positioning shaft 3. Both ends of the fixing device 4 are respectively connected to the two horizontal sides through fusing pieces 9, so that in the normal use state of the valve, the L-shaped connecting rod 5 is fixed at one end of the positioning shaft 3 and the spring 6 is in a stretched state.

[0021] A connecting piece 11 for reinforcement is provided between the two vertical rods 51 to prevent the connecting rod from deforming and to prevent the problem of out-of-step during the movement of the two connecting rods. The vertical side 51 of the L-shaped connecting rod 5 is inclined in the horizontal direction relative to the positioning shaft 3, and the inclination angle is such that the horizontal side 52 after opening abuts against the double valve plate 2. The width of the horizontal side should correspond to the width of the valve plate to ensure that it does not contact the inner surface of the valve body when the connecting rod falls, and at the same time can abut against the valve plate. The vertical side 51 of the L-shaped connecting rod 5 is inclined in the vertical direction relative to the positioning shaft 3, so that when the check valve is in normal use, the horizontal side 52 is located below the positioning shaft 3, that is, inside the check valve body 1.

[0022] As Figure 3 shown, in another embodiment of the present invention, there is one spring 6. One end is connected to the connecting piece 11 between the two vertical sides 51, and the other end is connected to the distal end of the positioning shaft. The rest of the structure is the same as that of the first embodiment. In the case where the size of the check valve body is small, the size and weight of the connecting rod are also designed to be small, and a single spring can pull its movement, so using one spring also plays a role in saving space.

[0023] The present invention is further described in combination with the working process: In the normal use state of the check valve, the fuse piece fixes the connecting rod to one end of the positioning shaft. At this time, the spring is in a stretched state, as Figure 4 shown. In the normal use state, the structure of the present invention does not affect the opening degree of the valve and can ensure the normal ventilation effect. When a fire breaks out, the gas temperature rises, causing the fuse piece to melt. Under the action of the restoring force of the spring, the connecting rod is driven to rotate downward, so that the horizontal side of the connecting rod finally abuts against the check valve plate after rotation.

Claims

1. A temperature-sensitive device for a check valve, installed inside the check valve body (1) of a double-door, comprising a positioning shaft (3) parallel to the symmetry center of the double-valve plate (2), both ends of the positioning shaft (3) being connected to the valve body, characterized in that, There are two symmetric L-shaped connecting rods (5) provided on the positioning shaft (3). 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), enabling the connecting rod to rotate around the fixed shaft (8); one end of the spring (6) is connected to the L-shaped connecting rod (5), and the other end is connected to the distal end of the positioning shaft (3); a fuse piece (9) is provided at the end of the L-shaped connecting rod (5), such that when the valve is in the normal use state, the connecting rod is fixed to one end of the positioning shaft (3), and the spring (6) is in a stretched state; a connecting member (11) is provided between the L-shaped connecting rods (5); one end of the spring (6) is connected to the connecting member (11), and the other end is connected to the distal end of the positioning shaft (3).

2. The temperature-sensitive device for a check valve according to claim 1, characterized in that, A fixing device (4) is provided on the positioning shaft (3), and both ends of the fixing device (4) are respectively connected to the horizontal sides (52) of the two connecting rods through fuse pieces (9).

3. The temperature-sensitive device for a check valve according to claim 1, characterized in that, There is one spring (6), the connecting member (11) is parallel to the horizontal side (52), and the spring (6) is provided at the central position of the connecting member (11).

4. The temperature-sensitive device for a check valve according to claim 1, characterized in that, The vertical side (51) is inclined relative to the positioning shaft (3) in the horizontal direction, and the inclination angle is such that the opened horizontal side (52) can abut against the double valve flap (2).

5. The temperature-sensitive device for a check valve according to claim 1, characterized in that, The vertical side (51) is inclined relative to the positioning shaft (3) in the vertical direction.

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