Fire rated check valve

Abstract

This utility model discloses a fireproof check valve, including a body with a circular valve channel. A matching valve cover is provided in the valve channel, and a check device with a fusible mechanism is installed within the valve channel. A support is provided in the valve channel, including a base and a hinged seat. The hinged seat is hinged to the base, and the valve cover is fixed to the hinged seat. A torsion spring is provided between the hinged seat and the base. The check device and the fusible mechanism are both mounted on the base. The check device includes a push rod movably mounted on the base, which can move horizontally on the base. A stretchable elastic element is provided at the end of the base opposite the valve cover, with one end connected to the opposite end of the base and the other end connected to the push rod. Compared with the prior art, this invention changes the traditional method of pressing and locking the valve cover by a rotating support, shortens the stroke of the check device, and improves the fireproof performance of the fireproof check valve.

Description

Technical Field

[0001] This utility model relates to a building fire protection device, and more particularly to a fireproof check valve. Background Technology

[0002] A fireproof check valve for flues is a type of non-return valve. Flue valves, like other valves, open and close automatically based on the force generated by the flow of the medium in the pipeline; they are a type of automatic valve. Check valves are used in piping systems, their main function being to prevent backflow of the medium, and they are suitable for pipelines carrying various media.

[0003] Fireproof check valves are used for smoke exhaust vents. When smoke is exhausted, it passes through the inlet and flows to the outlet, opening the valve cover and exiting outdoors. When no smoke is being exhausted, the valve cover closes to the outlet port, thereby reducing the backflow of external smoke into the pipe. Currently, fire-resistant check valves are typically single-piece or double-piece valve covers. During use, single-piece valve covers are relatively heavy, requiring strong winds and high air pressure from the smoke to open them. When the winds and air pressure are low, the smoke may not be able to fully open the valve cover, leading to backflow of smoke. Double-piece valve covers, being lighter, can solve this problem well. However, due to their two-piece structure, they are prone to leaks after resetting, causing external smoke to flow back through the gaps. Furthermore, the existing fire-resistant check valves all have their fusible links located at the outlet end. This means that when a fire occurs, high-temperature smoke or open flames generated from the inlet end cannot be isolated in time, allowing the smoke or flames to spread. Utility Model Content

[0004] The purpose of this utility model is to provide a fireproof check valve, and the technical problem to be solved is to improve the fireproof performance of the fireproof check valve.

[0005] To solve the above problems, this utility model adopts the following technical solution: a fireproof check valve, including a body with a circular valve channel, a matching valve cover in the valve channel, a check device in the valve channel, a fusible mechanism on the check device, a support in the valve channel, the support including a base and a hinge seat, the hinge seat being hinged to the base, the valve cover being fixed to the hinge seat, and a torsion spring between the hinge seat and the base, so that when there is no air in the pipeline, the valve cover closes the valve channel by means of the torsion spring, and when there is air in the pipeline, the air pushes the valve cover open. This allows air to flow through the valve passage. Both the check valve and the fusible link are mounted on the base. The check valve includes a push rod movably mounted on the base, which can move horizontally on the base. A stretchable elastic element is located at the end of the base opposite the valve cover. One end of the elastic element is connected to the end of the base opposite the valve cover, and the other end is connected to the push rod. Under normal conditions, the fusible link limits the check valve. When exposed to high temperatures or open flames, the fusible link melts when it reaches its melting point, activating the check valve. The push rod abuts against the hinge seat, preventing the valve cover from rotating and opening, thus achieving a seal.

[0006] Furthermore, the base is provided with a horizontally arranged guide groove, and the push rod is inserted into the guide groove.

[0007] Furthermore, the base is U-shaped, including a base plate and two vertical plates disposed on the base plate, guide grooves are respectively disposed on the vertical plates, and the two ends of the push rod are respectively inserted into and pass through the guide grooves to extend to the outer side of the two vertical plates.

[0008] Furthermore, the hinge part has a recessed groove near the hinge point with the base. When the fusion mechanism loses its limit on the check device, the elastic element returns to its original state and drives the push rod to move horizontally towards the valve cover, and finally moves into the groove, so that the upper end wall of the groove abuts against the upper end face of the part of the push rod that extends outside the vertical plate, thereby locking the valve cover.

[0009] Furthermore, the hinge seat is provided with an abutment portion, so that after the valve cover is pushed open by the wind, the abutment portion abuts against the push rod to limit the opening angle of the valve cover.

[0010] Furthermore, the hinge seat includes a connecting and fixing part, and at both ends of the connecting and fixing part are hinge parts that bend towards the base and downward. The lower end of the hinge part is hinged to the vertical plate, and the abutment part is provided on the hinge part.

[0011] Furthermore, the hinge is connected to the vertical plate via a hinge shaft, and a torsion spring is sleeved on the hinge shaft. One end of the torsion spring rests against the valve cover, and the other end rests against the base.

[0012] Furthermore, the elastic element is a tension spring.

[0013] Furthermore, two elastic elements are provided, which are symmetrically arranged in the base.

[0014] Furthermore, the fusion mechanism includes a first limiting member and a second limiting member. The first limiting member is fixed on the push rod, and the second limiting member is fixed on the end of the base away from the valve cover. The second limiting member and the first limiting member are welded together.

[0015] Compared with the prior art, this utility model, by setting a check valve and a fusion mechanism, includes a push rod that can move horizontally on the base. The push rod and the base are connected by an elastic element. When high temperature or open flame occurs in the pipeline during a fire, the fusion mechanism melts, causing the check valve to work. The push rod is pulled horizontally towards the valve cover by the elastic element and abuts against the hinge seat, preventing the valve cover from rotating and opening, thus isolating the smoke or open flame. When the push rod abuts against the hinge seat, its position is close to the hinge position between the base and the hinge seat. This changes the traditional method of pressing and locking the valve cover itself by a rotating bracket, shortens the stroke of the check valve, and improves the fireproof performance of the fireproof check valve. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of this utility model.

[0017] Figure 2 This is a cross-sectional view of the present invention. Figure 1 .

[0018] Figure 3 This is a schematic diagram of the valve cover opening of this utility model.

[0019] Figure 4 This is a schematic diagram of the valve cover locking mechanism of this utility model. Detailed Implementation

[0020] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments.

[0021] like Figure 1 , Figure 2As shown, this utility model discloses a fireproof check valve, including a body 1, which is convex in shape and has a raised circular valve channel 2. One end of the valve channel 2 has a circumferential rim for contacting the flue opening. A locking mechanism for engaging with the flue opening wall is provided on the rim. This locking mechanism is existing technology and generally includes a torsion spring, a locking plate, and a base. The locking plate is connected to the base via a rotating shaft, and the torsion spring is sleeved on the rotating shaft. One arm of the torsion spring is engaged with the base, and the other arm is engaged with the locking plate. The valve channel 2 penetrates the body. 1. The valve passage 2 supplies smoke or air. During installation, the flared edge faces the flue opening, and the protruding part of the body 1 faces the indoor side, so that one end of the valve passage 2 is the inlet and the other end is the outlet. The outlet is located on one end of the flared edge. A matching valve cover 3 is provided at the inlet of the valve passage 2. A circumferential abutment edge is provided at the inlet end of the valve passage 2, and the edge of the valve cover 3 abuts against the abutment edge. A bracket 4 is provided in the valve passage 2. The bracket 4 includes a base 41 and a hinge seat 42. The base 41 is fixed to the inner wall of the valve passage 2 by screws or other means. Hinged to the base 41, the valve cover 3 is fixed on the hinge seat 42. A torsion spring 43 is provided between the hinge seat 42 and the base 41. When there is no air in the pipeline, the torsion spring 43 causes the valve cover 3 to close the valve passage 2. When there is air in the pipeline, the air pushes the valve cover 3 open, allowing air to flow through the valve passage 2. A check device and a fuse mechanism are provided on the base 41. The check device includes a push rod 51 movably mounted on the base 41, which can move horizontally on the base 41. A valve cover 3 is provided on the end of the base 41 opposite to the valve cover 3. The stretchable elastic element 52 has one end connected to the end of the base 41 opposite to the valve cover 3, and the other end connected to the push rod 51. Under normal conditions, the fusion mechanism limits the check device. At this time, the elastic element 52 is stretched and the push rod 51 is limited to the end of the base 41 away from the valve cover 3. When exposed to high temperature or open flame, the fusion mechanism melts when it reaches the melting point, the check device is activated, the elastic element 52 is reset, and the push rod 51 is pulled to slide towards the hinge seat 42, finally abutting against the hinge seat 42, so that the valve cover 3 cannot be rotated to open, thus achieving a seal.

[0022] By using the above method, the horizontally moving push rod acts on the hinge seat connected to the valve cover, which can shorten the stroke of the check valve and lock the valve cover 3 in a short time, thereby improving the fire resistance performance of the fireproof check valve.

[0023] like Figure 1 and Figure 2As shown, the base 41 is U-shaped, including a base plate 412 and two vertical plates 413 disposed on the base plate 412. Guide grooves 411 are respectively provided on the two vertical plates 413. The guide grooves 411 are set at the same height and penetrate through the vertical plates 413. The two ends of the push rod 51 are respectively inserted into and pass through the guide grooves 411 to extend to the outer side of the two vertical plates 413. Specifically, a protrusion 511 is provided at the position of the push rod 51 on the inner side of the vertical plate 413, so that when the push rod 51 is located at the end of the guide groove 411 away from the valve cover 3, the protrusion 511 prevents the push rod 51 from coming out of the guide groove 411.

[0024] like Figure 1 , Figure 2 , Figure 3 As shown, the hinge seat 42 includes a connecting and fixing part 422. At both ends of the connecting and fixing part 422, there are hinge parts 423 that bend towards the base 41 and downward. The lower end of the hinge part 423 is hinged to the vertical plate 413. At the end of the hinge part 423 near the connecting and fixing part 422, there is an abutment part 421. After the valve cover 3 is pushed open by the wind, the abutment part 421 abuts against the push rod 51 to limit the opening angle of the valve cover 3. When there is no wind, the torsion spring 43 returns to its original position and pushes the valve cover 3 to close the valve passage 2 again.

[0025] like Figure 2 and Figure 4 As shown, a recessed groove 424 is provided at the hinge part 423 near the hinge point with the base 41 and opposite the position of the vertical plate 413. When the fusion mechanism loses its limit on the check device, the elastic element 52 returns to its original state and drives the push rod 51 to move horizontally towards the valve cover 3, and finally moves into the groove 424, so that the upper end wall of the groove 424 abuts against the upper end surface of the part of the push rod 51 that extends outside the vertical plate 413, thereby locking the valve cover 3.

[0026] like Figure 1 and Figure 2 As shown, the hinge 423 is connected to the vertical plate 413 by a hinge shaft 44. The torsion spring 43 is sleeved on the hinge shaft 44. One end of the torsion spring 43 rests on the valve cover 3, and the other end rests on the base 41.

[0027] In this utility model, the elastic element 52 is a tension spring. Preferably, there are two elastic elements 52, which are symmetrically arranged in the base 41. Each end of the elastic element 52 is provided with two hooks. One hook is hooked into the groove of the vertical plate 413 at one end of the valve cover 3, and the other hook is hooked into the groove of the protrusion 511 of the push rod 41.

[0028] like Figure 1 and Figure 2As shown, in this utility model, the fusion mechanism includes a first limiting member 61 and a second limiting member 62. The first limiting member 61 is fixed to the push rod 51, and the second limiting member 62 is fixed to the end of the base 41 away from the valve cover 3. The second limiting member 62 and the first limiting member 61 are fixed together by soldering. Specifically, the fusion mechanism is located in the middle between the base plate 412 and the push rod 51. Both the first limiting member 61 and the second limiting member 62 are L-shaped. One end of the first limiting member 61 is fastened to the push rod 51 by screws, and the other end is soldered to one end of the second limiting member 62. The other end is connected and fixed to the base plate 412 by rivets or the like. The fusion mechanism is made of metal material with a melting point of 150 degrees Celsius.

[0029] In this invention, the edge of the valve cover 3 is provided with a sealing ring to increase the sealing effect.

Claims

1. A fire safe check valve comprising a body (1) having a circular valve passage (2) formed therein, a correspondingly shaped valve cover (3) being provided in the valve passage (2), a check device being provided in the valve passage (2), a fuse mechanism being provided on the check device, characterized in that: The valve passage (2) is provided with a bracket (4), which includes a base (41) and a hinge seat (42). The hinge seat (42) is hinged to the base (41). The valve cover (3) is fixed on the hinge seat (42). A torsion spring (43) is provided between the hinge seat (42) and the base (41) so that the valve cover (3) can close the valve passage (2) by the torsion spring (43) when there is no air in the pipeline. When there is air in the pipeline, the valve cover (3) is pushed open by the air so that the air can flow through the valve passage (2). The check device and the fuse mechanism are both provided on the base (41). The check device includes A push rod (51) is set on the base (41). The push rod (51) can move horizontally on the base (41). A stretchable elastic element (52) is provided on the end of the base (41) opposite to the valve cover (3). One end of the elastic element (52) is connected to the end of the base (41) opposite to the valve cover (3), and the other end is connected to the push rod (51). Under normal conditions, the fusion mechanism limits the check device. When it encounters high temperature or open flame, the fusion mechanism melts when it reaches the melting point, the check device is activated, and the push rod (51) abuts against the hinge seat (42), so that the valve cover (3) cannot be rotated to open, thus achieving a seal.

2. The fire-rated check valve of claim 1, wherein: The base (41) is provided with a horizontally arranged guide groove (411), and the push rod (51) is partially inserted into the guide groove (411).

3. The fire-rated check valve of claim 2, wherein: The base (41) is U-shaped and includes a base plate (412) and two vertical plates (413) set on the base plate (412). Guide grooves (411) are respectively set on the vertical plates (413). The two ends of the push rod (51) are inserted into and pass through the guide grooves (411) to extend to the outer side of the two vertical plates (413).

4. The fire-rated check valve of claim 3, wherein: The hinge seat (42) includes a connecting and fixing part (422). At both ends of the connecting and fixing part (422), there are hinge parts (423) that bend towards the base (41) and downward. The lower end of the hinge part (423) is hinged to the vertical plate (413). The abutting part (421) is provided on the hinge part (423). The hinge part (423) has an inwardly recessed groove (424) near the hinge point with the base (41). When the fusion mechanism loses its limit on the check device, the elastic element (52) returns to its original state and drives the push rod (51) to move horizontally towards the valve cover (3), and finally moves into the groove (424), so that the upper wall of the groove (424) abuts against the upper end face of the part of the push rod (51) that extends to the outside of the vertical plate (413), thereby locking the valve cover (3).

5. The fire-rated check valve of claim 4, wherein: The hinge seat (42) is provided with an abutment part (421) so that after the valve cover (3) is pushed open by the wind, the abutment part (421) abuts against the push rod (51) to limit the opening angle of the valve cover (3).

6. The fire-rated check valve of claim 5, wherein: The hinge (423) is connected to the vertical plate (413) via a hinge shaft (44). A torsion spring (43) is sleeved on the hinge shaft (44). One end of the torsion spring (43) rests on the valve cover (3), and the other end rests on the base (41).

7. The fire-rated check valve of claim 6, wherein: The elastic element (52) is a tension spring.

8. The fire-rated check valve of claim 7, wherein: Two elastic elements (52) are provided, which are symmetrically arranged in the base (41).

9. The fire-rated check valve according to any one of claims 1-8, wherein: The fusion mechanism includes a first limiting member (61) and a second limiting member (62). The first limiting member (61) is fixed on the push rod (51), and the second limiting member (62) is fixed on the end of the base (41) away from the valve cover (3). The second limiting member (62) and the first limiting member (61) are welded together.

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