Fireproof and smoke-proof non-return device for flue

Abstract

The utility model provides a flue fire-proof smoke-proof non-return device which is characterized in that a valve plate is arranged in a valve cylinder through a spring hinge and is sealed with the valve cylinder, mounting seats of a torsional spring stop lever locking mechanism are symmetrically arranged on the inner wall of the valve cylinder on two sides of the spring hinge, a baffle ring stretches across the valve plate and is rotatably connected with the mounting seats on two sides, and a torsional spring is arranged between the mounting seats and the baffle ring and is fixedly connected with the valve cylinder. The fusing hook is locked at the hinge end of the spring, and the baffle ring overcomes elastic force and is connected with the fusing hook. According to the non-return device, installation of the valve plate can be achieved through an existing spring hinge, and the good smoke discharging and preventing effect is achieved; a fireproof structure of a torsion spring stop lever locking mechanism is additionally arranged, the locking structure is far away from a hinge point, enough large elastic pressure is provided under the action of small elastic force, or stronger elastic pressure is provided under the same elastic force, and the effective sealing fireproof effect is achieved. The product is simple in structure, high in overall strength, convenient to assemble, disassemble and replace, low in manufacturing cost, long in service life and beneficial to popularization and application.

Description

Technical Field

[0001] The utility model belongs to the technical field of fire protection, and in particular relates to a smoke and fire prevention and anti-return device for a flue. Background Art

[0002] In high-rise housing, the kitchen uses a public flue to discharge oil smoke. In order to prevent the backflow of oil smoke, a check valve is usually set on the public flue interface. The existing flue check valves on the market are all half-open, which is not conducive to the discharge of oil smoke and has poor fire prevention effect. Fire prevention is a key project of high-rise buildings and an important project to ensure the safety of people's lives and property. Otherwise, when a fire occurs on a certain floor, it is easy to spread to other floors through the flue, and the toxic gas generated by the fire spreads to other homes through the flue, which also causes harm to other people's lives. Patent CN216200866U discloses a fully open large ventilation smoke and fire check valve. It includes a main body, a connection port, an installation spring, a fixing plate, a return spring, a fire safety spring, a thermal deformation hook, a valve plate, a sealing ring, and a connecting shaft; the fully open large ventilation smoke and fire check valve described in the utility model is easy to install and disassemble, and has a better smoke prevention effect under the joint action of the return spring, the sealing ring, and the convex groove. However, its structure is complicated, and a connecting shaft needs to be used to successively pass through one end of the fixing plate socket, one end of the fire safety spring, the return spring, the other end of the fire safety spring, and the other end of the fixing plate socket to assemble the valve plate, the connecting port, the return spring, and the fire safety spring. The installation space is small, the assembly process is complicated, the assembly difficulty is high, the production efficiency is low, and the production cost is high. It is also not conducive to post-disaster resetting, because the fire safety spring is arranged at one end of the valve plate, it needs to have a large elastic force to ensure sufficient elastic force. Excessive elastic force is not conducive to installation in a small space, and it is easy to cause deformation or even damage of the valve plate at the moment of release, thereby losing the sealing effect. Utility Model Content

[0003] The utility model provides a flue fire and smoke prevention check device, which can effectively solve the above problems.

[0004] The utility model is achieved in this way:

[0005] A flue fire and smoke check device comprises a valve cylinder, a valve plate, a spring hinge and a torsion spring baffle rod locking mechanism, wherein the valve plate is installed inside the valve cylinder through a spring hinge and fits tightly with the valve cylinder, the torsion spring baffle rod locking mechanism is provided with a mounting seat, a baffle ring, a torsion spring and a fuse hook, the mounting seat is symmetrically arranged on the inner wall of the valve cylinder on both sides of the spring hinge, the baffle ring spans the valve plate and is rotatably connected to the mounting seats on both sides, the torsion spring is arranged between the mounting seat and the baffle ring and forms an elastic force away from the spring hinge, the fuse hook is locked to the end of the spring hinge, and the baffle ring overcomes the elastic force and is connected to the fuse hook.

[0006] As a further improvement, the spring hinge is provided with a first hinge plate, a second hinge plate, a hinge spring and a hinge shaft, the first hinge plate and the second hinge plate are respectively provided with hinge holes on both sides, the hinge shaft passes through the hinge holes and is connected with the first hinge plate and the second hinge plate, the hinge spring is sleeved on the hinge shaft, the hinge spring is a torsion spring, and the two ends of the torsion spring are respectively abutted against the inner side surfaces of the first hinge plate and the second hinge plate; the second hinge plate is bent outward away from the hinge hole side to form a bent plate, the first hinge plate is fixed on the valve cylinder, the second hinge plate is installed on the valve plate, and the hinge shaft is arranged close to the sealing plane of the valve plate.

[0007] As a further improvement, the mounting seat is provided with a fixed plate, a connecting plate and an axis plate, at least one end of the axis plate is connected to the fixed plate through the connecting plate, the mounting seat is fixed to the inner wall of the valve cylinder through the fixed plate, and the axis plate is provided with an axis hole; the retaining ring is provided with a locking rod and an axis rod, the axis rod is arranged at both ends of the locking rod, the axis rod is arranged in the axis hole, and the axis rod is perpendicular to the axis plate; the torsion spring sleeve is arranged on the axis rod, and one end is fixed to the locking rod, and the other end is fixed to the axis plate.

[0008] As a further improvement, a locking plate is provided at the position of the valve plate corresponding to the locking rod, and a locking groove is provided on the locking plate; or / and locking rods are provided at both sides of the shaft plates, and locking plates are provided at the locking rods corresponding to the retaining rings.

[0009] As a further improvement, a limit rod is provided on the valve plate side of the shaft plate, and the limit rod abuts against the locking rod just when the retaining ring presses the valve plate.

[0010] As a further improvement, a stepped constriction is provided in the middle of the valve cylinder to form a small-diameter air intake cylinder and a large-diameter exhaust cylinder. The valve plate is installed on the inner wall of the exhaust cylinder through a spring hinge, and the valve plate is pressed against the stepped constriction.

[0011] As a further improvement, a sealing cylinder is provided inside the air inlet cylinder of the valve cylinder, and a sealing edge extending toward the center is provided near the exhaust cylinder end of the sealing cylinder. The valve plate is mounted on the inner wall of the valve cylinder by a spring hinge, and the valve plate is pressed against the sealing edge.

[0012] As a further improvement, the vertical height between the step constriction or sealing edge away from the spring hinge end and the spring hinge is smaller than the vertical height between the step constriction or sealing edge at the spring hinge end and the spring hinge, that is, they are inclined.

[0013] As a further improvement, the valve cylinder is a reducer; a sealing ring is provided between the valve plate and the valve cylinder, the step neck or the sealing edge.

[0014] As a further improvement, the sealing ring is a "U"-shaped sealing ring, and the "U"-shaped sealing ring is sleeved on the valve plate or the sealing edge.

[0015] As a further improvement, the valve plate, the step neck or the sealing edge is provided with a sealing groove corresponding to the sealing ring.

[0016] As a further improvement, the opening of the sealed cylinder becomes smaller from the air inlet end to the air outlet end and has a trumpet-shaped structure or at least a step-shaped structure.

[0017] As a further improvement, the fuse hook is provided with a fixing plate, a low-temperature bonding layer and a hook, the fixing plate is connected to the hook via the low-temperature bonding layer, the fixing plate is connected to the spring hinge or the valve cylinder, and the retaining ring is connected to the hook; the air inlet port of the valve cylinder is provided with an inwardly folded first reinforcing edge, the air outlet port is provided with an outwardly folded second reinforcing edge, and the outer edge of the second reinforcing edge is provided with a third reinforcing edge.

[0018] The beneficial effects of the utility model are as follows: the non-return device of the present application can realize the installation of the valve plate by using the existing spring hinge, thereby achieving a good smoke exhaust and smoke prevention effect; and a fire prevention structure of the torsion spring baffle rod locking mechanism is added, and the locking structure is far away from the hinge point, providing a sufficiently large elastic pressure under the action of a smaller elastic force, or having a stronger elastic pressure under the same elastic force, thereby achieving an effective sealing and fire prevention effect; the product has a simple structure, high overall strength, easy assembly, easy disassembly and replacement, low cost, long service life, and is conducive to the promotion and application of the product. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solution of the implementation mode of the utility model, the drawings required for use in the implementation mode will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the utility model and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying creative work.

[0020] Figure 1 It is a schematic diagram of the overall structure provided by an embodiment of a smoke and fire prevention and anti-return device for a flue according to the utility model;

[0021] Figure 2 It is a cross-sectional view provided by an embodiment of a smoke and fire prevention and anti-return device for a flue according to the utility model;

[0022] Figure 3 It is a structural schematic diagram of a fuse hook provided in an embodiment of a flue fire and smoke prevention and non-return device of the utility model;

[0023] Figure 4 It is another overall structural schematic diagram provided by an embodiment of a flue fire and smoke prevention and non-return device of the utility model;

[0024] Figure 5 It is a structural schematic diagram provided by an embodiment of a flue fire and smoke prevention and non-return device of the utility model;

[0025] Figure 6 It is a schematic diagram of the internal structure provided by an embodiment of a smoke and fire prevention and anti-return device for a flue according to the utility model;

[0026] Figure 7 It is another cross-sectional view provided by an embodiment of a flue fire and smoke prevention and non-return device of the utility model;

[0027] Figure 8 yes Figure 7 The enlarged schematic diagram of point A in the middle;

[0028] Fig. 9 It is another structural schematic diagram provided by an embodiment of a flue fire and smoke prevention and non-return device of the utility model;

[0029] Fig.10 yes Fig. 9 The enlarged schematic diagram of point B in the middle;

[0030] Fig.11 It is a partial explosion diagram provided by an embodiment of a smoke and fire prevention and anti-return device for a flue of the utility model;

[0031] Fig.12 yes Fig.11 The enlarged schematic diagram of the center C;

[0032] Fig.13 It is a structural schematic diagram of a closed cylinder provided by an embodiment of a smoke and fire prevention and anti-return device for a flue according to the utility model;

[0033] Fig.14 It is another structural schematic diagram of a fuse hook provided in an embodiment of a flue fire and smoke prevention and non-return device of the utility model.

[0034] Reference numerals:

[0035] Valve cylinder 1; stepped neck 11; air inlet cylinder 12; exhaust cylinder 13; first reinforced edge 14; second reinforced edge 15; third reinforced edge 16; valve plate 2; sealing ring 21; sealing groove 22; locking plate 23; locking groove 24; spring hinge 3; first hinge plate 31; second hinge plate 32; hinge spring 33; hinge shaft 34; hinge hole 35; torsion spring baffle locking mechanism 4; mounting seat 41; fixing plate 411; connecting plate 412; shaft plate 413; shaft hole 414; locking rod 415; locking plate 416; baffle ring 42; locking rod 421; shaft rod 422; torsion spring 43; fuse hook 44; fixing plate 441; low-temperature bonding layer 442; hook 443; sealing cylinder 5; sealing edge 51. DETAILED DESCRIPTION

[0036] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model. Therefore, the following detailed description of the embodiments of the utility model provided in the drawings is not intended to limit the scope of the utility model for which protection is claimed, but merely represents selected embodiments of the utility model.

[0037] In the description of the present invention, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0038] In the description of the present invention, the terms "inside", "symmetrical", "both sides", "on", "between", "far away", "end", "inner wall", "two ends", "inside", "vertical", "middle", "center", "inward fold", "outward fold", "above" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0039] Reference Figure 1-14 As shown, a flue fire and smoke check device comprises a valve cylinder 1, a valve plate 2, a spring hinge 3 and a torsion spring baffle rod locking mechanism 4, wherein the valve plate 2 is mounted inside the valve cylinder 1 through the spring hinge 3 and is in close contact with the valve cylinder 1, the torsion spring baffle rod locking mechanism 4 is provided with a mounting seat 41, a baffle ring 42, a torsion spring 43 and a fuse hook 44, the mounting seat 41 is symmetrically arranged on the inner wall of the valve cylinder 1 on both sides of the spring hinge 3, the baffle ring 42 spans the valve plate 2 and is rotatably connected to the mounting seats 41 on both sides, the torsion spring 43 is arranged between the mounting seat 41 and the baffle ring 42 and forms an elastic force away from the spring hinge 3, the fuse hook 44 is locked at the end of the spring hinge 3, and the baffle ring 42 overcomes the elastic force and is connected to the fuse hook 44.

[0040] The valve plate 2 is controlled to open and close by a spring hinge 3. When smoke needs to be exhausted to the outside, the wind pulls the valve plate 2 to open. When smoke is no longer to be exhausted to the outside, the valve plate 2 is closed under the action of its own weight and the spring hinge 3.

[0041] The torsion spring baffle locking mechanism 4 is separately arranged from the spring hinge 3. Since the functions of the two are different, the spring hinge 3 must control the valve plate 2 to open and close, and also facilitate the opening of the valve plate 2, otherwise it is not conducive to the discharge of oil smoke to the outside; while the torsion spring baffle locking mechanism 4 is to hinder the opening of the valve plate 2, so that the valve plate 2 has a better airtight compression effect, and prevents the smoke or poisonous gas at the fire scene from being discharged to other floors through the flue, and also prevents the fire from spreading to other places through the flue. The torsion spring baffle locking mechanism 4 is far away from the spring hinge fulcrum of the valve plate 2, and its pressing force on the valve plate 2 is greater, which has a better fire prevention effect. Furthermore, the two are separately arranged to avoid the assembly of multiple parts in a small space, which increases the difficulty of assembling the device; and the structure is centrally arranged, and in order to match each part, the modification of the parts is large, which increases the manufacturing cost.

[0042] The hinge plate on one side of the spring hinge 3 is locked on the inner wall of the valve cylinder 1, and the hinge plate on the other side is locked on the valve plate 2. The spring hinge 3 adopts a conventional flat plate structure hinge plate. The fuse hook 44 is locked to the hinge plate of the spring hinge 3 on the side of the valve cylinder 1 by screws, or locked to the inner wall of the valve cylinder 1 in the same vertical direction as the spring hinge 3. It is locked by screws, which is convenient for installation and later replacement.

[0043] The spring hinge 3 can be arranged on the valve cylinder 1 on the oil fume inlet side of the valve plate, or on the valve cylinder 1 on the oil fume outlet side of the valve plate. Opening to the outlet side can be achieved by changing the arrangement of the spring.

[0044] Furthermore, the spring hinge 3 is provided with a first hinge plate 31, a second hinge plate 32, a hinge spring 33 and a hinge shaft 34, the first hinge plate 31 and the second hinge plate 32 are respectively provided with hinge holes 35 on both sides, the hinge shaft 34 passes through the hinge hole 35 and is connected with the first hinge plate 31 and the second hinge plate 32, the hinge spring 33 is sleeved on the hinge shaft 34, the hinge spring 33 is a torsion spring, and the two ends of the torsion spring are respectively abutted against the inner side surfaces of the first hinge plate 31 and the second hinge plate 32; the second hinge plate 32 is bent outward away from the hinge hole 35 to form a bent plate, the first hinge plate 31 is fixed on the valve cylinder 1, the second hinge plate 32 is installed on the valve plate 2, and the hinge shaft 34 is arranged close to the sealing plane of the valve plate 2.

[0045] The second hinge plate 32 is configured as a bent plate, and the bending angle of the bent plate can be an obtuse angle, so that when the valve plate 2 is sealed with the valve cylinder 1, especially when it is in close contact with the step constriction 11 or the sealing edge 51, a better sealing effect can be achieved; if the second hinge plate 32 does not adopt the bent plate design, when it is in close contact, point contact will occur when it is close to the spring hinge 3 side, and the sealing opening on the far side is prone to open, resulting in a poor sealing effect; by adopting the design of a bent plate, when the valve plate 2 is in close contact with the step constriction 11 or the sealing edge 51, a surface contact is formed, and the sealing effect is improved. The height position of the hinge shaft 34 is close to the height position of the valve plate 2 and the step constriction 11 or the sealing edge 51, and the valve plate 2 is easier to seal after closing. At the same time, the lower the position of the hinge shaft 34 is, the larger the opening angle of the valve plate 2 is, and the smoother the smoke exhaust is.

[0046] The articulated shaft 34 is arranged close to the sealing plane of the valve plate 2, which means that it is close to the same plane as the sealing surface of the valve plate 2 and the step neck 11 or the sealing edge 51, and as close to the sealing plane as possible. When the sealing surface is inclined, it is close to the sealing plane of the articulated shaft 34. If the spring hinge 3 is arranged at the lower end of the inclined step neck 11 or the sealing edge 51, the articulated shaft 34 is close to the lower end sealing plane of the valve plate 2.

[0047] Furthermore, the mounting seat 41 is provided with a fixing plate 411, a connecting plate 412 and an axis plate 413, at least one end of the axis plate 413 is connected to the fixing plate 411 through the connecting plate 412, the mounting seat 41 is fixed to the inner wall of the valve cylinder 1 through the fixing plate 411, and an axis hole 414 is provided on the axis plate 413; the retaining ring 42 is provided with a locking rod 421 and an axis rod 422, the axis rod 422 is provided at both ends of the locking rod 421, the axis rod 422 is provided in the axis hole 414, and the axis rod 422 is perpendicular to the axis plate 413; the torsion spring 43 is sleeved on the axis rod 422, and one end is fixed to the locking rod 421, and the other end is fixed to the axis plate 413.

[0048] The retaining ring 42 is installed through the mounting seat 41 to avoid the problem of oil smoke leakage caused by the shaft hole for installing the retaining ring 42 on the valve cylinder 1. The shaft plate 413 is vertically arranged with the shaft rod 422, and more precisely, the shaft hole 414 on the shaft plate 413 is parallelly arranged with the shaft plate 413, which can avoid friction with the shaft hole 414 when the shaft rod 422 rotates, so that the rotation is smoother on the one hand, and the wear of the shaft hole 414 or the shaft rod 422 is avoided on the other hand, and the service life is extended.

[0049] The locking rod 421 is preferably configured as an arc-shaped locking rod 421 , which has higher strength and avoids deformation.

[0050] Furthermore, the valve plate 2 is provided with a locking plate 23 at the position corresponding to the locking rod 421 , and the locking plate 23 is provided with a locking groove 24 ; or / and the shaft plates 413 on both sides are provided with locking rods 415 , and the locking rods 415 are provided with locking plates 416 corresponding to the retaining rings 42 .

[0051] When the retaining ring 42 is released by the fuse hook 44, the locking rod 421 of the retaining ring 42 presses against the valve plate 2, and the locking rod 421 is then inserted into the locking groove 24 of the locking plate 23, or the locking plate 416 is inserted into the locking rod 415, to prevent smoke from exerting pressure on the valve plate 2, so that the retaining ring 42 overcomes the torsion spring 43 and is lifted up, resulting in the valve plate 2 not being tightly sealed and leaking air or smoke. The above two structures can be set separately or together, and can be set according to the needs of the application site.

[0052] Furthermore, a limiting rod is provided on the valve disc 2 side of the shaft plate 413 , and the limiting rod abuts against the locking rod 421 just when the retaining ring 42 presses the valve disc 2 .

[0053] The limit rod can prevent the lock rod 421 from generating excessive pressure at the moment of fire protection separation, thereby damaging the valve plate 2, causing the valve plate 2 to deform or break, and affecting the sealing effect. The limit rod can be in contact with the lock rod 421 when the retaining ring 42 presses the valve plate 2, or the position of the limit rod is slightly lower than the position at this time.

[0054] Furthermore, a stepped constriction 11 is provided in the middle of the valve cylinder 1 to form a small-diameter air intake cylinder 12 and a large-diameter exhaust cylinder 13 . The valve plate 2 is installed on the inner wall of the exhaust cylinder 13 through a spring hinge 3 , and the valve plate 2 is pressed against the stepped constriction 11 .

[0055] The diameter of the air inlet cylinder 12 is smaller than that of the exhaust cylinder 13, so that low pressure can be formed in the exhaust cylinder, which is more conducive to the opening of the valve plate 2 for exhaust. The valve plate 2 can be directly pressed and sealed with the step shrinkage 11 of the valve cylinder 1.

[0056] In actual application, the spring hinge 3 can also be installed on the inner wall of the air inlet cylinder 12. At this time, by changing the arrangement of the spring, the spring can also be opened toward the air outlet, and the fuse hook 44 is arranged on the exhaust cylinder 13 and connected to the stop ring 42. This method can be easily obtained through the structural design of the present application and belongs to an equivalent technical solution.

[0057] Furthermore, a sealing cylinder 5 is provided inside the air inlet cylinder 12 of the valve cylinder 1, and a sealing edge 51 extending toward the center is provided at the end of the sealing cylinder 5 close to the exhaust cylinder 13, and the valve plate 2 is installed on the inner wall of the valve cylinder 1 through a spring hinge 3, and the valve plate 2 is pressed against the sealing edge 51.

[0058] The valve plate 2 is preferably mounted on the inner wall of the air inlet cylinder 12 through a spring hinge 3. In addition, a sealing cylinder 5 is added, which is more conducive to processing according to the size of the valve plate 2, with a higher matching degree and a better sealing effect. The sealing cylinder 5 is tightly fitted or interference fit with the valve cylinder 1. The sealing cylinder 5 can also be integrally formed with the valve cylinder 1. The device is preferably made of stainless steel or other metal materials by die casting, and can also be made of fireproof plastic injection molding.

[0059] Furthermore, the vertical height between the step constriction 11 or the sealing edge 51 away from the end of the spring hinge 3 and the spring hinge 3 is smaller than the vertical height between the step constriction 11 or the sealing edge 51 at the end of the spring hinge 3 and the spring hinge 3. That is to say, the step constriction 11 or the sealing edge 51 is inclined, so as to facilitate the covering with the valve plate 2.

[0060] The setting of the height difference of the stepped constriction 11 or the sealing edge 51 is more conducive to the valve plate to be opened and closed with the spring hinge 3 as the center, and the sealing effect is better.

[0061] Furthermore, the valve cylinder 1 is a reducer, and a sealing ring 21 is provided between the valve plate 2 and the valve cylinder 1, the stepped constriction 11 or the sealing edge 51 to increase the sealing effect.

[0062] The valve cylinder 1 is configured as a reducer, so that it can be connected to exhaust pipes of different diameters. The air inlet cylinder 12 and the exhaust cylinder 13 are respectively reducers, which realize two-stage diameter reduction, so that it can be connected to exhaust pipes of more different diameters. At the same time, it is also convenient for the sealing cylinder 5 to be sealed and installed in the valve cylinder 1.

[0063] Furthermore, the sealing ring 21 is a “U”-shaped sealing ring 21 , and the “U”-shaped sealing ring 21 is sleeved on the valve plate 2 or the sealing edge 51 .

[0064] The "U"-shaped sealing ring 21 is easy to install and is not easy to fall off.

[0065] Furthermore, the valve plate 2, the step neck 11 or the sealing edge 51 is provided with a sealing groove 22 corresponding to the sealing ring 21 to enhance the sealing effect.

[0066] Furthermore, the opening of the sealed tube 5 becomes smaller from the air inlet end to the air outlet end, and is in a trumpet shape or at least a step-like structure.

[0067] On the one hand, it is convenient to match and press the valve plate 2 to seal; on the other hand, it makes the oil smoke gradually form a greater pressure in the closed tube 5, which is conducive to opening the valve plate 2 for smoke exhaust.

[0068] The opening of the valve plate 2 end of the sealing cylinder 5 becomes smaller, so that a certain gap is formed between the sealing cylinder 5 and the valve cylinder 1, which is conducive to the valve plate 2 opening with the spring hinge 3 as the center, playing a certain avoidance role.

[0069] Furthermore, the fuse hook 44 is provided with a fixing plate 441, a low-temperature bonding layer 442 and a hook 443, the fixing plate 441 is connected to the hook 443 through the low-temperature bonding layer 442, the fixing plate 441 is connected to the spring hinge 3 or the valve cylinder 1, and the retaining ring 42 is connected to the hook 443; the air inlet port of the valve cylinder 1 is provided with an inwardly folded first reinforcing edge 14, the air outlet port is provided with an outwardly folded second reinforcing edge 15, and the outer edge of the second reinforcing edge 15 is provided with a third reinforcing edge 16.

[0070] During a fire, the temperature reaches a certain level, the low-temperature bonding layer 442 is melted, and the hook 443 is separated from the fixing plate 441, thereby releasing the hook 443 and the locking rod 421 of the retaining ring 42, and the locking rod presses the valve plate 2 under the action of the torsion spring 43.

[0071] The provision of the reinforcing edge can improve the strength of the valve cylinder 1 .

[0072] During installation, the device is set vertically, with one side of the spring hinge 3 at the top; or the device is set horizontally, preferably the spring hinge 3 is located above the central horizontal plane of the valve cylinder 1, and more preferably the spring hinge 3 is located directly above the central dot of the valve cylinder 1. This method is conducive to the spring hinge 3 opening the valve plate, while avoiding the heavy wear of the spring hinge 3 on one side caused by the low center of gravity. The oil smoke pipe is inserted into the valve cylinder 1 from the first reinforcement edge 14 and sealed.

[0073] When in use, under normal conditions, the gear lever 42 is reset and connected to the fuse hook 44, and the valve plate 2 is sealed and pressed with the sealing tube 5 under the action of the elastic hinge 3; when exhausting oil smoke, under the action of the exhaust thrust, the valve plate 2 overcomes the force of the spring hinge 3 to open, and the oil smoke is discharged from the valve tube, and the valve plate 2 is reset under the action of the spring hinge 3 when the exhaust stops; when a fire occurs, when the temperature reaches a certain level, the low-temperature bonding layer 442 will be melted, and the hook 443 will be disengaged from the fixing plate 441, thereby releasing the hook 443 and the locking rod 421 of the retaining ring 42, and the locking rod presses the valve plate 2 under the action of the torsion spring 43; at the same time, the locking rod 421 is inserted into the locking groove 24 of the locking plate 23, or the locking plate 416 is inserted into the locking rod 415, to prevent smoke and dust from exerting pressure on the valve plate 2, so that the retaining ring 42 overcomes the torsion spring 43 and is lifted up, resulting in the valve plate 2 not being tightly sealed and leaking air or smoke. The above two structures can be set separately or together according to the needs of the application site. When it is necessary to reset the gear lever 42, first connect the fixing plate 441 with the hook 443 using the low-temperature bonding layer 442, or replace the entire fuse hook 44, and then reset the locking rod 421 on the fuse hook 44. When resetting the locking rod 421, if the locking plate 23 is used to lock the position, the locking rod 421 can be disengaged from the locking groove 24 by forcing it; if the locking plate 416 and the locking rod 415 are locked, the locking rod 415 needs to be pushed out of the locking plate 416 with a workpiece so that the locking plate 416 is disengaged from the locking rod 415 before the locking rod 421 can be reset.

[0074] The above description is only the preferred implementation of the utility model, and is not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A smoke and fire prevention device, characterized in that: The invention comprises a valve barrel (1), a valve plate (2), a spring hinge (3) and a torsion spring stop rod locking mechanism (4); the valve plate (2) is mounted inside the valve barrel (1) through the spring hinge (3) and is tightly fitted with the valve barrel (1); the torsion spring stop rod locking mechanism (4) is provided with a mounting seat (41), a stop ring (42), a torsion spring (43) and a fuse hook (44); the mounting seat (41) is symmetrically arranged on the inner wall of the valve barrel (1) on both sides of the spring hinge (3); the stop ring (42) spans the valve plate (2) and is rotatably connected to the mounting seats (41) on both sides; the torsion spring (43) is arranged between the mounting seat (41) and the stop ring (42) and forms an elastic force away from the spring hinge (3); the fuse hook (44) is locked at the end of the spring hinge (3); and the stop ring (42) overcomes the elastic force and is connected to the fuse hook (44).

2. A flue fire and smoke prevention and non-return device according to claim 1, characterized in that: The spring hinge (3) is provided with a first hinge plate (31), a second hinge plate (32), a hinge spring (33) and a hinge shaft (34); hinge holes (35) are respectively provided on both sides of the first hinge plate (31) and the second hinge plate (32); the hinge shaft (34) passes through the hinge hole (35) and is connected to the first hinge plate (31) and the second hinge plate (32); the hinge spring (33) is sleeved on the hinge shaft (34); the hinge spring (33) is a torsion spring; two ends of the torsion spring are respectively abutted against the inner side surfaces of the first hinge plate (31) and the second hinge plate (32); the second hinge plate (32) is bent outwardly away from the hinge hole (35) to form a bent plate; the first hinge plate (31) is fixed on the valve cylinder (1); the second hinge plate (32) is mounted on the valve plate (2); and the hinge shaft (34) is arranged close to the sealing plane of the valve plate (2).

3. A flue fire and smoke prevention and non-return device according to claim 1, characterized in that: The mounting seat (41) is provided with a fixing plate (411), a connecting plate (412) and an axis plate (413); at least one end of the axis plate (413) is connected to the fixing plate (411) via the connecting plate (412); the mounting seat (41) is fixed to the inner wall of the valve cylinder (1) via the fixing plate (411); and an axis hole (414) is provided on the axis plate (413); the retaining ring (42) is provided with a locking rod (421) and an axis rod (422); the axis rod (422) is provided at both ends of the locking rod (421); the axis rod (422) is provided in the axis hole (414), and the axis rod (422) is perpendicular to the axis plate (413); the torsion spring (43) is sleeved on the axis rod (422), and one end of the torsion spring is fixed to the locking rod (421), and the other end is fixed to the axis plate (413).

4. A flue fire and smoke prevention and non-return device according to claim 3, characterized in that: The valve plate (2) is provided with a locking plate (23) at a position corresponding to the locking rod (421), and the locking plate (23) is provided with a locking groove (24); or / and the shaft plates (413) on both sides are provided with locking rods (415), and the locking rods (415) are provided with locking plates (416) corresponding to the retaining ring (42).

5. The smoke and fire prevention device according to claim 1, characterized in that: The valve cylinder (1) is provided with a stepped constriction (11) in the middle, forming a small-diameter air intake cylinder (12) and a large-diameter air exhaust cylinder (13); the valve plate (2) is mounted on the inner wall of the air exhaust cylinder (13) via a spring hinge (3), and the valve plate (2) is pressed against the stepped constriction (11).

6. A flue fire and smoke prevention and non-return device according to claim 1, characterized in that: A sealing cylinder (5) is provided inside the air inlet cylinder (12) of the valve cylinder (1), and a sealing edge (51) extending toward the center is provided at the end of the sealing cylinder (5) close to the air outlet cylinder (13). The valve plate (2) is mounted on the inner wall of the valve cylinder (1) via a spring hinge (3), and the valve plate (2) is pressed against the sealing edge (51).

7. A flue fire and smoke prevention and non-return device according to claim 5 or 6, characterized in that: The vertical height between the stepped constriction (11) or the sealing edge (51) away from the end of the spring hinge (3) and the spring hinge (3) is smaller than the vertical height between the stepped constriction (11) or the sealing edge (51) at the end of the spring hinge (3) and the spring hinge (3), i.e., they are arranged obliquely.

8. A flue fire and smoke prevention and non-return device according to claim 5 or 6, characterized in that: The valve cylinder (1) is a reducer; a sealing ring (21) is provided between the valve plate (2) and the valve cylinder (1), the stepped neck (11) or the sealing edge (51).

9. A flue fire and smoke prevention and non-return device according to claim 8, characterized in that: The sealing ring (21) is a "U"-shaped sealing ring (21), and the "U"-shaped sealing ring (21) is sleeved on the valve plate (2) or the sealing edge (51); the valve plate (2), the stepped constriction (11) or the sealing edge (51) are provided with a sealing groove (22) corresponding to the sealing ring (21).

10. A flue fire and smoke prevention and non-return device according to claim 6, characterized in that: The fuse hook (44) is provided with a fixing plate (441), a low-temperature bonding layer (442) and a hook (443); the fixing plate (441) is connected to the hook (443) via the low-temperature bonding layer (442); the fixing plate (441) is connected to the spring hinge (3) or the valve cylinder (1); the retaining ring (42) is connected to the hook (443); the air inlet port of the valve cylinder (1) is provided with an inwardly folded first reinforcing edge (14); the air outlet port is provided with an outwardly folded second reinforcing edge (15); the outer edge of the second reinforcing edge (15) is provided with a third reinforcing edge (16); the opening of the sealing cylinder (5) becomes smaller from the air inlet end to the air outlet end, and is in a trumpet shape or at least one step-shaped structure.

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