Fireproof check valve for flue

Abstract

The utility model aims to provide a flue fireproof check valve, which comprises a base, an outer cover and a valve body, the outer cover is arranged on the base and is convenient to be butted with a pipeline, the valve body is arranged in the outer cover, a support body and a support seat are arranged on the valve body, two blades for blocking the valve body are rotatably arranged between the support body and the support seat, and the valve body is arranged on the support seat. Two swing rods are rotationally arranged on the supporting body, fusing pieces which can be fused in a high-temperature environment are arranged on the two swing rods, elastic pieces are arranged between the swing rods and the valve body, when the temperature of a flue is normal, the two swing rods are buckled together through the fusing pieces, at the moment, the swing rods do not make contact with the blades, and when the temperature of the flue is too high, the fusing pieces are fused when reaching the melting point, so that the blades are prevented from being damaged. The safety valve has the beneficial effects that through the arrangement of the swing rod and the spring, after the fusing piece is fused, the swing rod can rapidly rotate to abut against the blade through the tension of the spring, the blade is pressed to block the valve body, smoke can be prevented from ejecting the blade in the fire disaster, and fire is prevented from spreading towards a public pipeline.

Description

Technical Field

[0001] The utility model belongs to the technical field of fire dampers, in particular to a flue fire check valve. Background Art

[0002] A flue check valve is an automatic valve that opens and closes automatically by the force generated by the flow of the medium in the pipeline. In kitchens using longitudinal public flues, a check valve is installed between the range hood outlet and the public flue to prevent high-temperature flue gas from being discharged into the public flue and entering other floors or high-temperature flue gas in the public flue from flowing back into the kitchen. However, existing flue check valves do not have fire protection functions. When a fire occurs, the fire will follow the smoke into the range hood outlet, push the blades on the check valve and spread into the public flue. If the fire is too large, it will spread to other floors and cause a large fire. Summary of the Invention

[0003] To achieve the above-mentioned purpose, the specific technical solution of the present invention is as follows: a flue fire check valve, comprising a base and an outer cover mounted on the base for convenient docking with a pipeline, and a valve body arranged in the outer cover, the valve body being provided with a support body and a support seat, two blades for sealing the valve body being rotatably arranged between the support body and the support seat, two rocker arms being rotatably arranged on the support body, the two rocker arms being provided with fuses that can melt in a high temperature environment, an elastic member being provided between the rocker arms and the valve body, the elastic member always providing a pulling force to the rocker arms, when the flue temperature is normal, the two rocker arms are buckled together by the fuse to ensure that the rocker arms are not pulled apart, at this time, the rocker arms are between the two blades, when the flue temperature is too high, the fuse melts due to the high temperature, causing the rocker arms to lose their restraint, the two rocker arms being expanded to both sides of the valve body under the elastic pulling force of the elastic member, and as the elastic member slides and pulls the rocker arms apart, the rocker arms gradually press against the blades, and when the two rocker arms are rotated to the maximum opening angle, the two rocker arms press against the blades, thereby achieving the sealing of the valve body by the blades.

[0004] It is worth mentioning that when the flue temperature is too high, it refers to a temperature above 100°C, usually 150°C, while the temperature required for the fuse to melt is above 100°C, usually in the range of 150-280°C.

[0005] According to the above technical solution, the two blades are further provided with gears that mesh with each other. When the two blades rotate, the two gears mesh with each other to achieve synchronous opening and closing of the two blades. The gear structure drives the two blades to rotate and separate, so that the two blades are synchronized, ensuring that the two blades can move synchronously. Even if one of the elastic parts fails, the two blades can continue to operate normally under the pull of one of the elastic parts.

[0006] According to the above technical solution, the support body includes an outer support plate, a positioning plate is provided on the outer support plate, and a positioning groove is provided on the positioning plate which fits the outer shape of the rocker arm. When the two rocker arms are close to each other, the positioning plate will limit the rotation angle of the rocker arm. After the rocker arm is rotated into the positioning groove, it cannot be rotated. The positioning plate and the positioning groove limit the rotation angle of the rocker arm to prevent the two rocker arms from rotating excessively when they are close to each other, resulting in damage to the deformation tension of the elastic part and inability to accurately drive the two rocker arms to rotate apart. When the rocker arm is rotated into the positioning groove, it is also convenient for the installation of the fuse.

[0007] According to the above technical solution, an inner support plate is further provided on the outer support plate, a rotating shaft is rotatably provided between the support seat and the inner support plate, the blade is provided on the rotating shaft, and a limiting plate is provided on the support seat. When the blade drives the rotating shaft to rotate, one end of the rotating shaft conflicts with the limiting plate, and the other end of the rotating shaft conflicts with the outer support plate, thereby limiting the opening and closing position of the blade. The rotating shaft is pressed between the limiting plate and the outer support plate, and the blade will not deviate from the opening and closing position on the valve body when opening and closing.

[0008] According to the above technical solution, a magnet is further provided on the blade, and the valve body is made of an adsorbable material. The blade will be adsorbed on the valve body through the magnet. When smoke passes through the base, the smoke flow will push the blade to rotate open, allowing the valve body to discharge smoke smoothly. When no smoke passes through the base, the blade will reset and be adsorbed on the valve body to achieve sealing of the valve body.

[0009] According to the above technical solution, further, a sealing gasket is provided on the blade to seal the gap between the valve body and the blade.

[0010] According to the above technical solution, the rocker arm is further rotatably arranged on the outer support plate and the inner support plate, the elastic member can be set as a spring, a pull ring and a pulling member are provided on the spring, the pulling member is sleeved on the rocker arm and can slide between the rocker arm, a notch is opened on the valve body, the pull ring is set on the notch, when the fuse is blown, the spring pulls the rocker arm to rotate through the pulling member, and synchronously, the pulling member will slide on the rocker arm.

[0011] According to the above technical solution, a turn buckle is rotatably provided on the base, and a convex point is provided on the outer cover. After the base and the outer cover are aligned, the turn buckle is rotated to buckle over the convex point, so that the turn buckle can press the outer cover to achieve the assembly between the base and the outer cover.

[0012] According to the above technical solution, the gear is a first gear, and the inner support plate is provided with an inclined surface. When the first gear is provided on the blade, it is provided close to the inclined surface of the inner support plate so that the first gear avoids the valve body. When the blade rotates, with the cooperation of the two first gears, the two blades will separate or close synchronously.

[0013] According to the above technical solution, further, the gear is a second gear, and when the second gear is provided on the blade, it is located between the support seat and the limiting plate.

[0014] Compared with the prior art, the beneficial effects of the present invention are as follows: through the provision of the rocker arm and the spring, after the fuse is melted, the tension of the spring can be used to quickly rotate the rocker arm to contact the blades, pressing the blades to block the valve body, thereby preventing smoke from pushing open the blades during a fire and preventing the fire from spreading to the common pipeline. In addition, the provided positioning plate and positioning groove can limit the rotation angle of the rocker arm to prevent the two rocker arms from rotating excessively to one side when close together, causing deformation and tension of the elastic member to be damaged. In the event of a fire, the elastic member cannot accurately pull the rocker arm to contact the blades, and mutually meshing gears are provided on both rotating shafts, so that the two blades can move synchronously to open or close, and even if one of the elastic members fails, the two blades can continue to operate normally under the pull of one of the elastic members. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions of the embodiments of the present disclosure, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present disclosure. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0016] Figure 1 This is a reference schematic diagram of the overall structural state of Example 1 of the present utility model.

[0017] Figure 2 This is a reference schematic diagram of the structural state when the fuse in Example 1 of the present invention is not blown.

[0018] Figure 3 This is a reference schematic diagram of the structural state of the fuse in embodiment 1 of the present invention after it has not been blown.

[0019] Figure 4 This is a reference schematic diagram of the side view structural state of the valve body of the second embodiment of the present utility model.

[0020] Figure 5 This is a reference schematic diagram of the side view structural state of the valve body of Example 3 of the present utility model.

[0021] Explanation of the marks in the figure: 1. Base; 2. Outer cover; 3. Valve body; 4. Turn buckle; 5. Support body; 6. Blade; 7. Rocker arm; 8. Spring; 9. Fuse; 10. Support seat; 11. Rotating shaft; 12. Outer support plate; 13. Inner support plate; 14. Limit plate; 15. Notch; 16. Pull ring; 17. Pulling member; 18. Sealing gasket; 19. First gear; 20. Second gear. DETAILED DESCRIPTION

[0022] The embodiments of the present disclosure are described in detail below in conjunction with the accompanying drawings. The implementation methods of the present disclosure are explained below through specific examples. Those skilled in the art can easily understand other advantages and effects of the present disclosure from the contents disclosed in this specification, which are further explained below in conjunction with the accompanying drawings.

[0023] Example 1

[0024] See also Figure 1-3 It can be seen that an embodiment of the present utility model is a flue fire check valve, comprising a base 1 and an outer cover 2 mounted on the base 1 for easy docking with a pipe, a valve body 3 is provided in the outer cover 2, a support body 5 and a support seat 10 are provided on the valve body 3, a blade 6 is provided between the support body 5 and the support seat 10 for resettable rotation, and a sealing gasket 18 is provided on the blade 6 for sealing the gap between the valve body 3 and the blade 6. When smoke passes through the base 1, the smoke flow will push the blade 6 to rotate open, so that the valve body 3 can discharge smoke smoothly. When no smoke passes through the base 1, the blade 6 will reset and be adsorbed on the valve body 3, thereby sealing the valve body 3.

[0025] Furthermore, a turn buckle 4 is rotatably provided on the base 1, and a convex point is provided on the outer cover 2. After the base 1 and the outer cover 2 are aligned, the turn buckle 4 can be rotated to buckle over the convex point, so that the turn buckle 4 can press the outer cover 2 to achieve the assembly between the base 1 and the outer cover 2.

[0026] Furthermore, the support body 5 includes an outer support plate 12, an inner support plate 13 is provided on the outer support plate 12, two rotating shafts 11 are rotatably provided between the support seat 10 and the inner support plate 13, the blade 6 is provided on the rotating shaft 11, and a magnet is provided on the blade 6. The blade 6 can rotate between the support seat 10 and the inner support plate 13 through the rotating shaft 11 to achieve opening and closing with the valve body 3. The valve body 3 is made of an adsorbable material, and the blade 6 will be adsorbed on the valve body 3 through the magnet to achieve closing of the blade 6 and the valve body 3.

[0027] Furthermore, a positioning plate is provided on the outer support plate 12, and a positioning groove is provided on the positioning plate that fits the shape of the rocker arm 7. When the two rocker arms 7 are close to each other, the positioning plate will limit the rotation angle of the rocker arm 7, and the rocker arm 7 cannot rotate after it rotates into the positioning groove.

[0028] Furthermore, a limit plate 14 is provided on the support seat 10. When the rotating shaft 11 is provided on the support seat 10 and the inner support plate 13, one end of the rotating shaft 11 contacts the limit plate 14, and the other end of the rotating shaft 11 contacts the outer support plate 12, thereby limiting the opening and closing position of the blade 6.

[0029] Furthermore, two rocker arms 7 are rotatably provided on the inner support plate 13, and the two rocker arms 7 are provided with fuses 9 that can be melted in a high temperature environment. The fuse 9 can buckle the two rocker arms 7, and an elastic member is provided between the valve body 3 and the rocker arm 7. The elastic member can be set as a spring 8. When the fuse 9 is melted, the two rocker arms 7 will rotate and separate around the inner support plate 13 under the elastic force of the spring 8, and during the rotation of the rocker arms 7, the spring 8 will slide between the rocker arms 7. When the two rocker arms 7 are rotated to the maximum opening angle, the two rocker arms 7 will press against the blade 6 to achieve the sealing of the valve body 3 by the blade 6.

[0030] Furthermore, the spring 8 is provided with a pull ring 16 and a pulling piece 17. The pulling piece 17 is sleeved on the rocker arm 7 and can slide between the rocker arm 7. A notch 15 is provided on the valve body 3, and the pull ring 16 is arranged on the notch 15. When the fuse 9 is blown, the spring 8 pulls the rocker arm 7 to rotate through the pulling piece 17, and synchronously, the pulling piece 17 will slide on the rocker arm 7.

[0031] Example 2

[0032] Reference Figure 4 As shown: The difference between this embodiment and the first embodiment is that a gear structure is added to the rotating shaft 11, so that the two blades 6 can be opened or closed synchronously during the opening and closing process;

[0033] Furthermore, a first gear 19 is provided on the two rotating shafts 11, and an inclined surface is provided on the inner support plate 13. The first gear 19 is arranged close to the inclined surface of the inner support plate 13, and the two first gears 19 are engaged with each other. When the smoke pushes the two blades 6 to rotate close to opening, the two rotating shafts 11 will drive the two first gears 19 to rotate and engage, so that the opening speed of the two blades 6 remains consistent.

[0034] Example 3

[0035] Reference Figure 5 As shown: the difference between this embodiment and the second embodiment is that the position of the gear structure on the rotating shaft 11 is different, so that the gear structure can be installed in a suitable position according to production and assembly requirements;

[0036] Furthermore, a second gear 20 is provided on the two rotating shafts 11 and located in the support seat 10. The two second gears 20 are engaged with each other. When the smoke pushes the two blades 6 to rotate close to opening, the two rotating shafts 11 will drive the two second gears 20 to rotate and engage, so that the opening speed of the two blades 6 remains consistent.

[0037] In summary, the above is only a specific embodiment of the present disclosure, but the scope of protection of the present disclosure is not limited to this. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in this disclosure should be included in the scope of protection of the present disclosure. Therefore, the scope of protection of the present disclosure should be based on the scope of protection of the claims.

Claims

1. A flue fire check valve, comprising a base (1), an outer cover (2) mounted on the base (1) for convenient connection with a pipeline, and a valve body (3) disposed in the outer cover (2), characterized in that: The valve body (3) is provided with a support body (5) and a support seat (10), two blades (6) for sealing the valve body (3) are rotatably provided between the support body (5) and the support seat (10), two swing rods (7) are rotatably provided on the support body (5), and the two swing rods (7) are provided with fuses (9) that can be melted in a high temperature environment, and an elastic member is provided between the swing rod (7) and the valve body (3), and the elastic member always provides a pulling force to the swing rod (7). When the flue temperature is normal, the two swing rods (7) are buckled together by the fuse (9) to ensure that the valve body (3) is in good condition. The swing rod (7) is prevented from being pulled apart. At this time, the swing rod (7) is between the two blades (6). When the flue temperature is too high, the fuse (9) melts due to the high temperature, causing the swing rod (7) to lose its restriction. The two swing rods (7) are unfolded to both sides of the valve body (3) under the elastic tension of the elastic member. As the elastic member slides and pulls the swing rod (7) apart, the swing rod (7) gradually presses against the blades (6). When the two swing rods (7) are rotated to the maximum opening angle, the two swing rods (7) press against the blades (6), thereby achieving the sealing of the valve body (3) by the blades (6).

2. A flue fire check valve according to claim 1, characterized in that: The two blades (6) are both provided with gears that mesh with each other. When the two blades (6) rotate, the two gears mesh with each other, thereby achieving synchronous opening and closing of the two blades (6).

3. The flue fire check valve according to claim 1, characterized in that: The support body (5) includes an outer support plate (12), and a positioning plate is provided on the outer support plate (12). The positioning plate is provided with a positioning groove that fits the outer shape of the pendulum rod (7). When the two pendulum rods (7) are close to each other, the positioning plate will limit the rotation angle of the pendulum rod (7), and the pendulum rod (7) cannot rotate after it rotates into the positioning groove.

4. A flue fire check valve according to claim 3, characterized in that: An inner support plate (13) is provided on the outer support plate (12); a rotating shaft (11) is rotatably provided between the support seat (10) and the inner support plate (13); the blade (6) is provided on the rotating shaft (11); a limiting plate (14) is provided on the support seat (10); when the blade (6) drives the rotating shaft (11) to rotate, one end of the rotating shaft (11) contacts the limiting plate (14), and the other end of the rotating shaft (11) contacts the outer support plate (12), thereby limiting the opening and closing position of the blade (6).

5. The flue fire check valve according to claim 1, characterized in that: The blade (6) is provided with a magnet, and the valve body (3) is made of an adsorbable material. The blade (6) is adsorbed on the valve body (3) through the magnet. When smoke passes through the base (1), the smoke flow pushes the blade (6) to rotate, so that the valve body (3) can discharge smoke smoothly. When no smoke passes through the base (1), the blade (6) is reset and adsorbed on the valve body (3), thereby sealing the valve body (3).

6. The flue fire check valve according to claim 1, characterized in that: The blade (6) is provided with a sealing gasket (18) capable of sealing the gap between the valve body (3) and the blade (6).

7. The flue fire check valve according to claim 1, characterized in that: The rocker arm (7) is rotatably arranged on the outer support plate (12) and the inner support plate (13); the elastic member can be arranged as a spring (8); a pull ring (16) and a pulling member (17) are arranged on the spring (8); the pulling member (17) is sleeved on the rocker arm (7) and can slide between the rocker arm (7); a notch (15) is provided on the valve body (3); the pull ring (16) is arranged on the notch (15); when the fuse (9) is blown, the spring (8) pulls the rocker arm (7) to rotate through the pulling member (17); synchronously, the pulling member (17) slides on the rocker arm (7).

8. The flue fire check valve according to claim 1, characterized in that: A turn buckle (4) is rotatably provided on the base (1), and a convex point is provided on the outer cover (2). After the base (1) and the outer cover (2) are aligned, the turn buckle (4) is rotated to buckle over the convex point, so that the turn buckle (4) can press the outer cover (2), thereby realizing the assembly between the base (1) and the outer cover (2).

9. The flue fire check valve according to claim 2, characterized in that: The gear is a first gear (19), and the inner support plate (13) is provided with an inclined surface. When the first gear (19) is provided on the blade (6), it is provided close to the inclined surface of the inner support plate (13), so that the first gear (19) and the valve body (3) avoid each other. When the blade (6) rotates, the two blades (6) will be synchronously separated or closed under the cooperation of the two first gears (19).

10. The flue fire check valve according to claim 2, characterized in that: The gear is a second gear (20). When the second gear (20) is arranged on the blade (6), it is located between the support seat (10) and the limiting plate (14).

Images