Fireproof check valve
By introducing a check valve, a fusion mechanism, and an assist mechanism into the fireproof check valve, the problems of difficulty in opening the valve cover and poor sealing under low wind conditions are solved, achieving effective sealing and self-resetting under high temperature or open flame conditions, thus improving fire resistance performance.
Patent Information
- Application Number
- CN202520795070.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-25
- Publication Date
- 2026-02-10
- Estimated Expiration
- 2035-04-25
AI Technical Summary
Existing fireproof check valves are difficult to open effectively under low wind and air pressure conditions, and there are problems such as poor sealing leading to backflow of smoke or spread of open flames. In particular, the poor sealing of the two-piece structure and the improper setting of the fuse mechanism lead to air leakage and smoke spread.
A fireproof check valve was designed, comprising a check device, a fusion mechanism, an assist mechanism, and a return mechanism. By installing fusion mechanisms at both the inlet and outlet ends, the check device is melted by high temperature or open flame. Combined with the assist mechanism and the return mechanism, the valve cover is sealed. An inclined vent is used to improve the valve cover reset effect.
It achieves effective sealing under low wind and high temperature conditions, prevents backflow of smoke and spread of open flame, improves fire resistance, and ensures that the valve cover can automatically reset in the absence of wind, reducing the risk of air leakage.
Smart Images
Figure CN223895165U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to a kind of building fire prevention devices, in particular to a fire prevention check valve. BACKGROUND
[0002] The fire prevention check valve of flue is a check valve, and the flue valve is automatically opened and closed by the force generated by the flow of medium in pipeline, and belongs to an automatic valve. The check valve is used in pipeline system, and its main function is to prevent medium backflow, and can be applied to the pipeline of various media.
[0003] The fire prevention check valve is used in the smoke exhaust hole of smoke exhaust, and when smoke gas is exhausted, the smoke gas passes through the air inlet end and flows to the air outlet end to open the valve cover, and then is discharged outside. When there is no smoke gas to be exhausted, the valve cover is closed on the air outlet port, so as to reduce the backflow of external smoke gas into the pipeline. At present, the fire prevention check valve is usually single or two pieces of valve cover. In use, the single valve cover is heavy, so that only smoke gas with large wind force and air pressure can open the valve cover. When the wind force and air pressure of smoke gas are small, the valve cover cannot be completely opened, which causes the smoke gas to flow back. The two-piece valve cover can solve the above problems, but due to its two-piece structure, it is easy to leak after resetting, which causes the external smoke gas to flow back from the gap. Moreover, the existing fire prevention check valve fuse mechanism is arranged at the air outlet end, which cannot cut off the high-temperature smoke gas or open fire from the air inlet end in time when fire occurs, so as to cause the smoke gas or open fire to spread. SUMMARY
[0004] The utility model aims at providing a fire prevention check valve, and the technical problem to be solved is to improve the fire prevention performance of the fire prevention check valve.
[0005] To solve the above problems, the utility model discloses the following technical scheme realizes: a fireproof check valve, including the valve body, the valve body has the air inlet end and the air outlet end, the valve body includes the base, the valve cover, be equipped with the air vent on the base, the valve cover rotatablely arranged on the air vent, the air vent is semicircular, is symmetrically arranged on the base, is equipped with the partition plate between two air vents, the shape of valve cover is compatible with the shape of air vent, valve cover sets up on the one end of base located the air outlet end, to when the wind from the air inlet end enters the valve body, promote valve cover and rotate and open, make the wind can pass through from the air vent after from the air outlet end and discharge, be equipped with check device on the one end of partition plate located the air outlet end, be equipped with the fusing mechanism on check device, normal state, fusing mechanism is located to check device, when meeting high temperature or open fire, fusing mechanism melts when reaching the melting point, check device starts, and valve cover is pressed tightly on the air vent, realizes sealing, still be equipped with the power assisting mechanism on the one end of partition plate located the air outlet end, to in the condition without wind, push valve cover to close with the air vent, be equipped with the through hole on the partition plate, and the through hole is opposite with fusing mechanism position, to with fusing mechanism is partially exposed in the air inlet end one end.
[0006] Further, the fusing mechanism includes a first fuse piece and a second fuse piece, the first fuse piece is fixed on the partition plate, the second fuse piece is L-shaped, one end of the second fuse piece is welded and fixed with the first fuse piece, and the other end of the second fuse piece abuts against the check device.
[0007] Further, the position where the first fuse piece and the second fuse piece are welded and fixed is opposite to the through hole, so that the position where the first fuse piece and the second fuse piece are welded and fixed is partially exposed.
[0008] Further, the check device includes a first torsion spring and a rotating arm, a shaft column is arranged at the center of the one end of the partition plate located the air outlet end, the shaft column is perpendicular to the surface of the partition plate, the rotating arm is provided with a shaft hole at the center thereof, the rotating arm is connected with the shaft column through the shaft hole, the torsion spring is arranged on the shaft column, the torsion spring has two first torsion arms, a limiting arm is arranged on the one end of the partition plate located the air outlet end, one of the first torsion arms abuts against the limiting arm, and the other of the first torsion arms abuts against the rotating arm.
[0009] Further, the two ends of the rotating arm are respectively provided with protruding portions, the surface of the one end of the valve cover located the air outlet end is provided with an arc-shaped slope surface, the curvature of the slope surface is compatible with the rotating track of the rotating arm and opposite to the positions of the protruding portions, so that when the rotating arm rotates, the protruding portions are driven to slide on the slope surface, and finally abut against the slope surface tightly.
[0010] Further, the power assisting mechanism includes a second torsion spring and a fixing column, the fixing column is fixed on the surface of the one end of the partition plate located the air outlet end, the axis of the fixing column is parallel to the surface of the partition plate, the second torsion spring is sleeved on the fixing column, the second torsion spring has two second torsion arms, the two second torsion arms respectively extend towards the valve cover and abut against the surface of the valve cover.
[0011] Furthermore, a hinge bracket is provided on one end of the dividing plate at the air outlet. The hinge bracket is fixed on the dividing plate. Both ends of the hinge bracket are provided with shaft holes that connect to the rotating shafts on the valve cover. The rotating shafts at both ends of the valve cover are inserted into the shaft holes. A raised groove is provided in the middle of the hinge bracket. The rotating arm is located in the raised groove. The two long sides of the raised groove are through grooves, allowing the rotating arm to rotate in the raised groove. A valve cover limiting part is provided on the long side of the raised groove to limit the maximum opening angle of the valve cover.
[0012] Furthermore, the base is also provided with a return mechanism to enable the valve cover to be fully reset after being opened. The return mechanism includes a first magnet in the valve cover and a second magnet at the air inlet end of the vent. The second magnet is fixed to the base by a bracket.
[0013] Furthermore, the vent is inclined, tilting from the upper end of the air inlet towards the lower end of the air outlet.
[0014] Furthermore, the vent is inclined, tilting from the upper end of the air inlet towards the lower end of the air outlet.
[0015] Compared with the prior art, this utility model, by setting a check valve and a fusion mechanism, enables the check valve to operate when high temperature or open flame occurs in the pipeline during a fire. The fusion mechanism melts, pressing the valve cover tightly against the vent, thus isolating the smoke or open flame. A through hole is set on the side of the dividing plate located at the air inlet end, exposing part of the fusion mechanism. This allows the fusion mechanism to be triggered at both the air outlet and air inlet ends, enabling the check valve to operate and improving 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. Figure 1 .
[0017] Figure 2 This is a schematic diagram of the structure of this utility model. Figure 2 .
[0018] Figure 3 This is a schematic diagram of the rotating arm and valve cover pressing together.
[0019] Figure 4 This is a schematic diagram of the air inlet and air outlet of this utility model.
[0020] Figure 5 This is a schematic diagram of the return mechanism of this utility model.
[0021] Figure 6 This is a schematic diagram of the structure of the check valve and the fuse mechanism of this utility model. Figure 1 .
[0022] Figure 7 This is a schematic diagram of the structure of the check valve and the fuse mechanism of this utility model. Figure 2 . Detailed Implementation
[0023] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments.
[0024] like Figure 1 , Figure 2 as well as Figure 4 As shown, this utility model discloses a fireproof check valve, including a valve body 1, which has an air inlet and an air outlet. The valve body 1 includes a base 2 and a valve cover 3. The base 2 includes a main body 21, with connecting edges 22 around its perimeter. A sealing strip 23 is provided on one end of the connecting edge 22 at the air outlet. The main body 21 is cylindrical and hollow. Ventilation openings 4 are provided on the main body 21. The ventilation openings 4 are semi-circular and symmetrically arranged on the main body 21. A dividing plate 5 is provided between two ventilation openings 4. The valve cover 3 is rotatably mounted on the dividing plate 5 via a pivot. On one end surface of the air outlet, the shape of the valve cover 3 is adapted to the shape of the vent 4. The edge of the valve cover 3 is larger than the edge of the vent 4 so that it abuts against the edge of the vent 4 when closed, forming a one-way valve. A sealing ring is provided on the edge of the valve cover 3 to achieve a seal. When air enters the valve body 1 from the air inlet, it pushes the valve cover 3 to rotate and open, allowing air to pass through the vent 4 and then be discharged from the air outlet. A check device 6 is provided on the end of the dividing plate 5 located at the air outlet. The check device 6 is equipped with a fuse mechanism 7. Under normal conditions, the fuse mechanism 7 limits the check device 6. Figure 3 As shown, when exposed to high temperature or open flame, the fusion mechanism 7 melts when it reaches its melting point, and the check device 6 is activated, pressing the valve cover 3 against the vent 4 to achieve a seal. An assist mechanism 8 is also provided on the end of the dividing plate 5 at the air outlet, so that the valve cover 3 can be pushed to close with the vent 4 when there is no wind. The dividing plate 5 is provided with a through hole 51, which is opposite to the position of the fusion mechanism 7, so that the fusion mechanism 7 is partially exposed at the air inlet end. This allows the fusion mechanism 7 to be triggered at both the air inlet and air outlet ends, so that the fusion mechanism 7 can be triggered to melt and the check device 6 can be activated when a fire occurs at either the air inlet or air outlet end.
[0025] In this invention, both the fuse mechanism 7 and the check valve 6 can be implemented using existing technologies. However, this invention employs the following structure.
[0026] like Figure 1 , Figure 6 and Figure 7As shown, the fuse mechanism 7 includes a first fuse piece 71 and a second fuse piece 72. The first fuse piece 71 is fixed to the dividing plate 5 by screws. Specifically, connecting holes are provided on both the dividing plate 5 and the first fuse piece 71. After the screw passes through the connecting hole, it is tightened with a nut to fix the first fuse piece 71 to the dividing plate 5. The second fuse piece 72 is L-shaped, with one end fixed to the first fuse piece 71 by soldering, and the other end abutting against the check device 6. The position where the first fuse piece 71 and the second fuse piece 72 are fixed by soldering is opposite to the through hole 51, so that the position where the first fuse piece 71 and the second fuse piece 72 are fixed by soldering is partially exposed, thereby enabling the fuse mechanism 7 to be triggered at the air intake end as well.
[0027] like Figure 1 , Figure 6 and Figure 7 As shown, the anti-return device 6 of this utility model can be implemented with the following structure, including a first torsion spring 61, a rotating arm 62, and a shaft 52 at the center of one end of the dividing plate 5 at the air outlet. The shaft 52 is perpendicular to the surface of the dividing plate 5. After passing through the dividing plate 5, a nut is provided on the surface of both ends of the dividing plate 5, and a thread is provided on the shaft 52. The two nuts are threadedly connected to the threads on the shaft 52 to fix the shaft 52 on the dividing plate 5. The rotating arm 62 has a shaft hole 63 at its center, and the rotating arm 62 is connected to the shaft through the shaft hole 63. 52 is connected, and torsion spring 61 is set on shaft column 52. Torsion spring 61 has two first torsion arms 611. A limiting arm 53 is provided on one end of the dividing plate 5 located at the air outlet. One of the first torsion arms 611 abuts against the limiting arm 53, and the other first torsion arm 611 abuts against the rotating arm 62. In this utility model, the limiting arm 53 is composed of one screw that fixes the first fuse piece 71. The other end of the second fuse piece 72 extends to abut against the outer edge of the rotating arm 62. The second fuse piece 72 is specifically set at the front end of the rotating arm 62 in the rotation direction.
[0028] like Figure 1 and Figure 6 As shown, the first torsion arm 611 that abuts against the limiting arm 53 has a bent ring portion, which is fitted onto the screw.
[0029] In this invention, the rotating arm 62 has bends around its perimeter to form an inner cavity, and another first torsion arm 611 abuts against one of the bends on the long side.
[0030] like Figure 1 , Figure 6 and Figure 7As shown, in this utility model, a hinge bracket 54 is provided on one end of the dividing plate 5 located at the air outlet. The hinge bracket 54 is fixed to the dividing plate 5 by screws. Both ends of the hinge bracket 54 are respectively provided with shaft holes for connecting to the rotating shafts on the valve cover 3. The rotating shafts at both ends of the valve cover 3 are respectively inserted into these shaft holes. A raised groove 55 is provided in the middle of the hinge bracket 54. The rotating arm 62 is located in the raised groove 55. The two long sides of the raised groove 55 are through grooves, allowing the rotating arm 62 to rotate within the raised groove 55. The shaft 52 passes through the raised groove 55 and is secured with a nut. An angle limiting part 56 is provided on the edge of the raised groove 55 opposite to the second fuse 72, restricting the rotation angle of the rotating arm 62. The angle limiting part 56 is located between the shaft 52 and the second fuse 72 and is close to the shaft 52. This angle limiting part 56 restricts the rotation angle of the rotating arm 62 to 90 degrees (e.g., ...). Figure 3 As shown), under normal conditions, the rotating arm 62 is located in the protrusion groove 55. A valve cover limiting part 57 is provided on the long side of the protrusion groove 55 to limit the maximum opening angle of the valve cover 3 and prevent it from being unable to return to its original position due to an excessive opening angle. Two valve cover limiting parts 57 are provided on each long side.
[0031] like Figure 6 and Figure 7 As shown, protrusions 64 are provided at both ends of the rotating arm 62 to further press the valve cover.
[0032] like Figure 1 and Figure 3 As shown, an arc-shaped slope 31 is provided on the surface of the valve cover 3 at the outlet end. The curvature of the slope 31 is adapted to the rotation trajectory of the rotating arm 62 and is opposite to the position of the protrusion 64. When the rotating arm 62 rotates, the protrusion 64 is driven to slide on the slope 31 and finally comes into close contact with the slope 31, further pressing the valve cover. The slope 31 is an inclined surface that gradually rises from the surface of the valve cover 3.
[0033] like Figure 1As shown, the assist mechanism 8 includes a second torsion spring 81 and a fixing post 82. The fixing post 82 is fixed to the surface of one end of the dividing plate 5 located at the air outlet. The fixing post 82 is integrally formed with the shaft post 52. The fixing post 82 is threaded, and its axis is parallel to the surface of the dividing plate 5. The second torsion spring 81 is sleeved on the fixing post 82 and is fixed to the fixing post 82 by two nuts threadedly connected to the threads on the fixing post 82. The second torsion spring 81 has two second torsion arms 83, which face the valve cover respectively. Extending in direction 3 and abutting against the surface of valve cover 3, in this utility model, the torque of the second torsion spring 81 should be less than the opening pressure requirement of the fireproof check valve, so as to prevent the fireproof check valve from failing to open, and also to ensure that the two torsion arms 82 of the second torsion spring 81 can push the valve cover 3 to reset in the absence of wind. In this utility model, the torque of the second torsion spring 81 is less than the torque of the first torsion spring 61, so when the rotating arm 62 rotates, even if it touches the second torsion arm 83, it will push it away, so that the rotating arm 62 can continue to rotate.
[0034] like Figure 5 As shown, a return mechanism 9 is also provided on the base 2 to enable the valve cover 3 to be fully reset after opening. The return mechanism 9 includes a first magnet 91 in the valve cover 3 and a second magnet 92 located at the air inlet end of the vent 4. The second magnet 92 is fixed on the base 2 by a bracket 93. The figure only shows the positional relationship between the bracket 93 and one of the valve covers.
[0035] like Figure 4 As shown, in this utility model, the vent 4 is inclined, tilting from the upper end of the air inlet to the lower end of the air outlet, so that after installation, the valve cover 3 can automatically reset due to gravity when there is no wind. This further enables the valve cover 3 to reset, and by cooperating with the assist mechanism, the reset effect of the valve cover 3 is greatly improved.
[0036] The installation of fireproof check valves is the same as that of existing similar products, and will not be described in detail here.
[0037] This utility model has the ability to trigger the fusion mechanism through the air inlet and air outlet, which greatly improves the fire resistance performance of the fireproof check valve. By setting up an assist mechanism, a return mechanism, and tilting the vent, the flexibility of valve cover closing is further improved, avoiding the gap between the valve cover and the vent after closing, which would allow smoke to enter the room from the air inlet through the gap.
Claims
1. A fireproof check valve, comprising a valve body (1), the valve body (1) having an air inlet and an air outlet, the valve body (1) comprising a base (2) and a valve cover (3), the base (2) having a vent (4), and the valve cover (3) being rotatably mounted on the vent (4), characterized in that: The ventilation openings (4) are semi-circular and symmetrically arranged on the base (2). A dividing plate (5) is provided between the two ventilation openings (4). The shape of the valve cover (3) is adapted to the shape of the ventilation openings (4). The valve cover (3) is located on the end of the base (2) at the air outlet so that when the air enters the valve body (1) from the air inlet, it pushes the valve cover (3) to rotate and open, allowing the air to pass through the ventilation openings (4) and then be discharged from the air outlet. A check device (6) is provided on the end of the dividing plate (5) at the air outlet. A fuse mechanism (7) is provided on the check device (6). Under normal conditions, the fuse... The shut-off mechanism (7) limits the check valve (6). When it encounters high temperature or open flame, the shut-off mechanism (7) melts when it reaches the melting point, and the check valve (6) is activated, pressing the valve cover (3) onto the vent (4) to achieve a seal. An assist mechanism (8) is also provided on the end of the dividing plate (5) located at the air outlet, so that the valve cover (3) can be pushed to close with the vent (4) when there is no wind. The dividing plate (5) is provided with a through hole (51), which is opposite to the position of the shut-off mechanism (7) so that the shut-off mechanism (7) is partially exposed at the air inlet end.
2. The fireproof check valve according to claim 1, characterized in that: The fusion mechanism (7) includes a first fusion piece (71) and a second fusion piece (72). The first fusion piece (71) is fixed on the dividing plate (5), and the second fusion piece (72) is L-shaped, with one end welded to the first fusion piece (71) and the other end abutting against the check device (6).
3. The fireproof check valve according to claim 2, characterized in that: The position where the first fuse (71) and the second fuse (72) are welded and fixed is opposite to the through hole (51), so that the position where the first fuse (71) and the second fuse (72) are welded and fixed is partially exposed.
4. The fireproof check valve according to claim 1, characterized in that: The check valve (6) includes a first torsion spring (61) and a rotating arm (62). A shaft (52) is provided at the center of one end of the dividing plate (5) at the air outlet. The shaft (52) is perpendicular to the surface of the dividing plate (5). A shaft hole (63) is provided at the center of the rotating arm (62). The rotating arm (62) is connected to the shaft (52) through the shaft hole (63). The torsion spring (61) is set on the shaft (52). The torsion spring (61) has two first torsion arms (611). A limiting arm (53) is provided at one end of the dividing plate (5) at the air outlet. One of the first torsion arms (611) abuts against the limiting arm (53), and the other first torsion arm (611) abuts against the rotating arm (62).
5. The fireproof check valve according to claim 4, characterized in that: The rotating arm (62) has protrusions (64) on both ends. The valve cover (3) has an arc-shaped slope (31) on one end of the air outlet. The curvature of the slope (31) is adapted to the rotation trajectory of the rotating arm (62) and is opposite to the position of the protrusions (64). When the rotating arm (62) rotates, the protrusions (64) are driven to slide on the slope (31) and finally come into close contact with the slope (31).
6. The fireproof check valve according to claim 1, characterized in that: The assist mechanism (8) includes a second torsion spring (81) and a fixed post (82). The fixed post (82) is fixed on one end surface of the dividing plate (5) at the air outlet. The axis of the fixed post (82) is parallel to the surface of the dividing plate (5). The second torsion spring (81) is sleeved on the fixed post (82). The second torsion spring (81) has two second torsion arms (83). The two second torsion arms (83) extend toward the valve cover (3) respectively and abut against the surface of the valve cover (3).
7. The fireproof check valve according to claim 1, characterized in that: A hinge bracket (54) is provided on one end of the dividing plate (5) at the air outlet. The hinge bracket (54) is fixed on the dividing plate (5). The two ends of the hinge bracket (54) are respectively provided with shaft holes that connect to the rotating shaft on the valve cover (3). The rotating shafts at both ends of the valve cover (3) are respectively inserted into the shaft holes. A raised groove (55) is provided in the middle of the hinge bracket (54). The rotating arm (62) is located in the raised groove (55). The two long sides of the raised groove (55) are through grooves, so that the rotating arm (62) can rotate in the raised groove (55). A valve cover limiting part (57) is provided on the long side of the raised groove (55) to limit the maximum opening angle of the valve cover (3).
8. The fireproof check valve according to any one of claims 1-7, characterized in that: The base (2) is also provided with a return mechanism (9) so that the valve cover (3) can be fully reset after being opened. The return mechanism (9) includes a first magnet (91) in the valve cover (3) and a second magnet (92) in the vent (4) located at the air inlet end. The second magnet (92) is fixed on the base (2) by a bracket (93).
9. The fireproof check valve according to claim 8, characterized in that: The ventilation opening (4) is inclined, tilting from the upper end of the air inlet to the lower end of the air outlet.
10. The fireproof check valve according to any one of claims 1-7, characterized in that: The ventilation opening (4) is inclined, tilting from the upper end of the air inlet to the lower end of the air outlet.