Fire damper actuator

Abstract

The present invention discloses a fire damper actuator, comprising a bracket, a support shaft provided on the bracket, a locking plate mounted on the support shaft, a pressure plate spring mounted on the support shaft between the locking plate and the bracket, a hot melt sheet extending toward the locking plate and capable of melting or separating at a set temperature, the locking plate provided with a claw extending toward the hot melt sheet and clamped onto the hot melt sheet, a valve plate strip corresponding to the locking plate hingedly connected to one end of the support shaft near the locking plate, a recess provided at one end of the locking plate facing the pressure plate spring, a hook provided on the valve plate strip that snaps into the recess, and a mutual locking mechanism between the locking plate and the valve plate strip after the locking plate is separated from the hot melt sheet and pressed against the valve plate strip. The present invention is applied to fire dampers in air ducts or using longitudinal common smoke ducts, and the actuator forces the valve plate in an open state to be forcibly closed and locked closed, thereby protecting the lives of residents.

Description

Technical Field

[0001] The present invention relates to a fire damper, in particular to a fire damper actuator. Background Art

[0002] Ventilation equipment is essential in modern buildings. Air ducts are crucial components of building ventilation systems, and fire dampers within them are a crucial element. Fire dampers include a valve body with an openable valve disc within the body. When the smoke temperature within the duct reaches a certain value, the valve disc should close to block smoke and fire. In kitchens using longitudinal public flue ducts, to prevent fumes from the flue duct from flowing back into the kitchen, a device such as a flue fire damper is typically installed between the range hood's exhaust pipe and the public flue duct. Existing flue fire dampers typically include a smoke duct formed by a housing. The smoke duct has opposing air inlets and outlets. The air inlet is connected to the range hood's exhaust pipe, and the outlet extends into the public flue duct. An openable and closable valve disc is installed at the smoke duct outlet. The valve disc consists of one or two discs, hinged to the smoke duct via a valve disc pivot. A high-temperature shutoff device is installed on the outlet side to force the valve disc to close. When the range hood is not in use, the valve is in the closed position due to its own gravity, covering the air outlet; when the range hood is in use, the valve is in the open position, away from the air outlet. Since multiple users share a common longitudinal flue, once a fire occurs in a household, a large amount of high-temperature harmful gases will flow into the common longitudinal flue. If the valve in the flue fire damper is not closed in time, these large amounts of high-temperature harmful gases will enter the home of the user who is using the range hood through the flue fire damper's smoke channel, thereby threatening the life safety of the occupants. The existing flue fire damper is provided with a high-temperature closing device on the outer end face of the air outlet end, which can force the valve to close toward the air inlet side at a set temperature. When the smoke temperature in the common flue is in a very high emergency state and the smoke temperature in the common flue reaches the set warning temperature, the high-temperature closing device forces the valve in the open state to close. However, the high-temperature closing devices on existing flue fire dampers all use the force of a spring to close the valve plate. When the high temperature in the public flue continues for a certain period of time, the spring fails due to the high temperature, the valve plate loses the restraining force of the spring and will be opened again. High-temperature harmful gases will flow into the user's home, thereby threatening the lives of the residents. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide a fire damper actuator which can forcibly close the fire damper valve plate when the smoke temperature in the public smoke duct is in an emergency state at a very high level, and the valve plate of the fire damper is always in a closed state.

[0004] In order to solve the above technical problems, the present invention includes a bracket, whose structural characteristics are that the bracket is provided with a support shaft, a locking pressure plate is installed on the support shaft, a pressure plate compression spring is installed on the support shaft between the locking pressure plate and the bracket, and a hot melt sheet is provided on the bracket that extends toward the locking pressure plate and can melt or separate at a set temperature, and the locking pressure plate and the hot melt sheet are interlocked.

[0005] A valve plate strip corresponding to the locking pressure plate is hinged on one end of the support shaft close to the locking pressure plate, and a recessed groove is provided on one end of the locking pressure plate facing the pressure plate compression spring, and a hook is provided on the valve plate strip that is snapped into the recessed groove. After the locking pressure plate is separated from the hot melt plate and pressed toward the valve plate strip, a mutual locking mechanism is provided between the locking pressure plate and the valve plate strip.

[0006] The mutually locking mechanism is that the valve plate pressure strip is wedge-shaped at its hinged end after it is opened, and the corresponding ends of the locking pressure plate and the valve plate pressure strip have conical cavities, and the valve plate pressure strip with a wedge-shaped hinged end and the locking pressure plate with a conical cavity form a wedge-shaped lock.

[0007] The thermal fuse is a bimetallic sheet formed by welding two metal sheets through a welding material that can melt at a set temperature.

[0008] The valve plate pressure strips are two symmetrically arranged.

[0009] The bracket includes a cross arm, one end of which is provided with a support leg, and the support shaft is installed on the cross arm; a support leg is also provided at the other end of the cross arm, and the end of the support leg is provided with a relatively outward-folded support foot.

[0010] The relative outer side surface of the end portion of the valve sheet pressure strip is in a step shape, and saw teeth are provided on the step-shaped outer side surface.

[0011] As another technical solution, the present invention includes a bracket, whose structural feature is that the bracket is provided with a support shaft, a locking pressure plate is mounted on the support shaft, a pressure plate compression spring is mounted on the support shaft between the locking pressure plate and the bracket, and a non-metallic hot melt sheet is provided on the bracket that extends toward the locking pressure plate and can melt or separate at a set temperature, and the locking pressure plate and the hot melt sheet are interlocked.

[0012] The non-metallic hot melt sheet is made of engineering plastic or nylon material.

[0013] After adopting the above structure, since a support shaft is provided on the bracket, a locking pressure plate is mounted on the support shaft, and a pressure plate compression spring is mounted on the support shaft between the locking pressure plate and the bracket, when the hot melt sheet is heated to a set temperature and melts or separates, the locking pressure plate is freed from the restraint of the hot melt sheet and slides along the support shaft under the action of the pressure plate compression spring, and the locking pressure plate is pressed on the valve plate of the fire damper, so that the valve plate is in a closed state; and a valve plate pressure strip corresponding to the locking pressure plate is hinged on one end of the support shaft close to the locking pressure plate, and a groove is provided on the end of the locking pressure plate facing the pressure plate compression spring, and a card is provided on the valve plate pressure strip. The hook is buckled in the groove, and after the locking plate is separated from the hot melt and pressed against the valve strip, a mutual locking mechanism is formed between the locking plate and the valve strip. When the hot melt is heated to a set temperature and melts or separates, the locking plate is separated from the constraint of the hot melt and slides along the support shaft under the action of the pressure plate compression spring. At this time, the hook on the valve strip disengages the groove of the locking plate, and the locking plate presses against the valve strip and causes the valve strip to open outward and press on the valve plate of the fire damper. Due to the wedge lock formed between the valve strip and the locking plate with a conical cavity, the valve plate is always in a closed state. The fire damper actuator of the present invention is used in fire dampers in air ducts or using longitudinal public smoke ducts. When the smoke temperature in the air duct or public smoke duct is in a very high emergency state and the smoke temperature reaches the set warning temperature, the actuator forces the valve plate in the open state to close, and the valve plate of the fire damper is always in a locked closed state, thereby protecting the lives of residents. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The specific embodiments of the present invention are described in further detail below with reference to the accompanying drawings:

[0015] Figure 1 It is a structural schematic diagram of the present invention;

[0016] Figure 2 for Figure 1 AA cross-sectional structural diagram;

[0017] Figure 3 for Figure 2 The state diagram of the middle valve strip when it is open;

[0018] Figure 4 This is a structural diagram of another embodiment of the present invention;

[0019] Figure 5 This is a structural diagram of a specific application example of the present invention;

[0020] Figure 6 for Figure 5 Schematic diagram of the structure of the right view. DETAILED DESCRIPTION

[0021] Referring to the accompanying drawings, the fire damper actuator includes a bracket 1, on which a support shaft 3 is mounted. The bracket 1 includes a crossbar, one end of which is provided with a support leg. The support shaft 3 is mounted on the crossbar. A support leg may also be provided at the other end of the crossbar. The ends of the support legs are provided with outwardly folded feet to facilitate mounting the bracket 1 at the corresponding position on the fire damper. A threaded section is provided at one end of the support shaft 3. A support shaft mounting hole is provided in the crossbar of the bracket 1. The threaded end of the support shaft 3 passes through the support shaft mounting hole and is secured to the crossbar of the bracket 1 via a nut. A locking plate 7 is mounted on the support shaft 3. A pressure plate spring 2 is mounted on the support shaft 3 between the locking plate 7 and the bracket 1. A thermal fuse 5 is provided on the bracket 1, extending toward the locking plate 7 and capable of melting or separating at a set temperature. The thermal fuse 5 may be a thermal fuse and may be in the form of a sheet, strip, column, or other similar shape. In practical applications, the thermal fuse 5 may also be made of non-metallic materials, such as engineering plastics or nylon that melt, separate, or break at a set temperature. The locking plate 7 is provided with a claw 6 that extends toward the hot melt plate 5 and is clamped onto the hot melt plate 5. The hot melt plate 5 is provided with a corresponding slot for the claw 6 to be clamped into, or the hot melt plate 5 is provided with a claw that extends toward the locking plate 7 and is clamped onto the locking plate 7. The locking plate 7 is provided with a clamping hole or a clamping slot corresponding to the claw, so that a mutual locking relationship is formed between the locking plate 7 and the hot melt plate 5. In this embodiment, the hot melt plate 5 is a bimetallic plate formed by welding two metal plates with a welding material that can melt at a set temperature, or a bimetallic plate that is inserted together by a pin or a card made of a hot melt material that can melt at a set temperature. The bimetallic plate is in the shape of a crank arm, one of which is provided with a mounting hole corresponding to the support shaft mounting hole of the bracket 1. The bimetallic plate is sleeved on the support shaft 3, and the support shaft 3 is fixed to the bracket 1 by a nut. Of course, the bimetallic plate can be directly mounted on the bracket. A valve strip 9 corresponding to the locking pressure plate 7 is hinged on one end of the support shaft 3 near the locking pressure plate 7. A notch is provided at the end of the support shaft 3, and a valve strip 9 is hinged in the notch via a hinge shaft 8. The valve strips 9 are two symmetrically arranged along the support shaft 3. A recessed groove 11 is provided on the end of the locking pressure plate 7 facing the pressure plate compression spring 2. A hook 10 is provided on the valve strip 9 that is snapped into the recessed groove 11. After the locking pressure plate 7 is separated from the hot melt plate 5 and pressed against the valve strip 9, a mutual locking mechanism is formed between the locking pressure plate 7 and the valve strip 9. The mutual locking mechanism is that the valve strip 9 is wedge-shaped at its hinged end after it is opened, and the corresponding ends of the locking pressure plate 7 and the valve strip 9 have a tapered cavity 4. The valve strip 9 with a wedge-shaped hinged end forms a wedge-shaped lock with the locking pressure plate 7 with the tapered cavity 4. See Figure 2 、 Figure 3The valve strip 9 is in the shape of a crank arm, and the locking plate 7 is roughly cylindrical. The two valve strips 9 are symmetrically arranged on the outer side of the locking plate 7. When the two valve strips 9 are in the locked state, the hooks 10 provided on the valve strips 9 (at this time located on the opposite inner sides of the valve strips 9) are snapped into the recessed groove 11 of the locking plate 7. One of the crank arms of the two valve strips 9 is arranged parallel to the axis of the support shaft 3. When the two valve strips 9 are opened, the opposing outer sides of the two valve strips 9 form an angle at the hinge end, and the inner cone angle of the tapered cavity 4 of the locking plate 7 is consistent with the angle formed by the two valve strips 9. A wedge-shaped lock is formed between the inner cone surface of the tapered cavity 4 of the locking plate 7 and the opposing outer sides of the two valve strips 9. The opposing outer sides of the ends of the valve strips 9 are stepped, and the stepped outer sides are provided with serrations.

[0022] See also Figure 5 、 Figure 6A specific application example shown is a flue fire damper used in a public flue. This flue fire damper includes a cylindrical smoke channel formed by a housing 12, with an air inlet 13 at one end and an outlet at the other. The outlet is provided with an end face 15 adapted to the smoke channel, which is provided with an outlet. This end face 15 also includes a rotatable valve disc 14 corresponding to the outlet and capable of opening only in the outlet direction. A mounting plate is provided on the outer wall of the housing 12. The mounting plate is integrally formed with the smoke channel forming the air inlet 13. The end face 15 is stamped and fixedly connected to the mounting plate. Two air outlets are located on the end face of the outlet end. These outlets are surrounded by projections or grooves facing the outer end face (which faces the direction of the smoke duct's airflow). Two rotatable valve discs 14, corresponding to the air outlets and open only in the airflow direction, are located on the outer end face of the outlet end. The two air outlets are symmetrically arranged on the outlet end face. The outlet end face and the upper ends of the two valve discs 14 are inclined toward the air inlet 13. The valve discs 14 are surrounded by curved edges or ridges corresponding to the projections or grooves. A fire damper actuator is located on the end face 15, which forces the valve disc 14 to close toward the air inlet 13 at a set temperature, ensuring that the valve disc 14 remains closed. In this embodiment, a notch is provided at one end of the support shaft 3 close to the valve disc 14, and a valve disc pressure strip 9 is hinged in the notch through a hinge shaft 8. The valve disc pressure strip 9 is composed of two symmetrically arranged along the support shaft 3, and the two valve disc pressure strips 9 are respectively arranged corresponding to the two valve discs 14. When the flue gas temperature in the common flue gas duct reaches the set warning temperature, the solder between the bimetallic strips melts, one of the strips falls off from the other, and the locking pressure plate 7 breaks away from the restraint of the bimetallic strips and slides along the support shaft 3 under the action of the pressure plate compression spring 2. At this time, the hook 10 on the valve disc pressure strip 9 disengages the sinking groove 11 of the locking pressure plate 7, and the locking pressure plate 7 presses against the two valve disc pressure strips 9 and causes the two valve disc pressure strips 9 to open outward and press on the two valve discs 14. Since a wedge-shaped lock is formed between the valve disc pressure strip 9 and the locking pressure plate 7 with a conical cavity 4, the valve disc 14 is always in a closed state. The opposite outer side surface of the end of the valve plate pressure strip 9 is in a step shape, and the stepped outer side surface is provided with serrations, so that the locking between the end of the valve plate pressure strip 9 and the valve plate 14 is more stable.

[0023] Figure 5 、 Figure 6 In the specific application example shown, the flue fire damper has an air outlet end face adapted to the smoke passage, with two air outlets provided on the end face, and a rotatable valve disc corresponding to the air outlets that can only be opened in the air outlet direction. The fire damper actuator for forcibly closing the valve disc is Figure 1In actual application, due to the diversity of the structure of the flue fire damper itself, such as: the valve disc is set in the smoke channel of the fire damper, the smoke channel can also be a variable diameter channel, the valve disc can be two discs or one disc, the opening direction of the valve disc can be split, side-opening, upward opening, downward opening, etc. In order to adapt to the forced closing of the valve disc of the flue fire damper with different structures, the fire damper actuator for forced closing of the valve disc can also adopt Figure 4 The single-leg structure shown facilitates installation of the fire damper actuator at the corresponding position of the flue fire damper, such as by installing it on the end face of the air outlet through the support foot with the end of the support leg folded outward, or on the mounting plate of the flue fire damper and on the side wall of the outer shell of the flue fire damper. When the fire damper is closed, the support shaft 3 is tightened and the locking plate 7 is tightened, so that the locking plate 7 and the support shaft 3 are tightened. When the fire damper is closed, the support shaft 3 is tightened and the locking plate 7 is tightened. When the fire damper is closed, the support shaft 3 is tightened and the locking plate 7 is tightened. When the fire damper is closed, the support shaft 3 is tightened and the locking plate 7 is tightened. When the fire damper is closed, the support shaft 3 is tightened and the locking plate 7 is tightened. A valve strip 9 corresponding to the locking plate 7 is hinged on one end of the support shaft 3 near the locking plate 7, which is a further optimization of the aforementioned structure. The valve strip 9 can be two symmetrically arranged along the support shaft 3, corresponding to the fire damper that forces the closure of two valve discs, or it can be a single strip, corresponding to the fire damper that forces the closure of a single valve disc. A recess 11 is provided on the end of the locking plate 7 facing the pressure plate compression spring 2, and a hook 10 is provided on the valve strip 9 that snaps into the recess 11. After the locking plate 7 is separated from the hot melt 5 and pressed against the valve strip 9, the valve strip 9 opens outward and presses on the valve disc 14. Since a wedge-shaped lock is formed between the valve strip 9 and the locking plate 7 having the tapered cavity 4, the valve disc 14 is always in a closed state.

[0024] The specific structures of the above embodiments are intended to illustrate the present invention rather than to limit the present invention. All improvements based on the present invention should fall within the scope of protection of the present invention.

Claims

1. A fire damper actuator, comprising a bracket (1), characterized in that The bracket (1) is provided with a support shaft (3), a locking plate (7) is mounted on the support shaft (3), a pressure plate compression spring (2) is mounted on the support shaft (3) between the locking plate (7) and the bracket (1), and a hot melt sheet (5) extending toward the locking plate (7) and capable of melting or separating at a set temperature is provided on the bracket (1), and the locking plate (7) and the hot melt sheet (5) are interlocked; A valve strip (9) corresponding to the locking pressure plate (7) is hinged on one end of the support shaft (3) near the locking pressure plate (7); a recess (11) is provided on one end of the locking pressure plate (7) facing the pressure plate compression spring (2); a hook (10) is provided on the valve strip (9) and is snapped into the recess (11); after the locking pressure plate (7) is separated from the hot melt plate (5) and pressed toward the valve strip (9), a mutual locking mechanism is provided between the locking pressure plate (7) and the valve strip (9); The mutually locking mechanism is that the valve plate pressure strip (9) is wedge-shaped at its hinged end after opening, the locking pressure plate (7) and the corresponding ends of the valve plate pressure strip (9) have a tapered cavity (4), and the valve plate pressure strip (9) with a wedge-shaped hinged end and the locking pressure plate (7) with the tapered cavity (4) form a wedge-shaped locking.

2. The fire damper actuator according to claim 1, characterized in that The thermal fuse (5) is a bimetallic sheet formed by welding two metal sheets through a welding material that can melt at a set temperature.

3. The fire damper actuator according to claim 1, characterized in that The valve plate pressure strips (9) are two symmetrically arranged ones.

4. The fire damper actuator according to claim 1, characterized in that The bracket (1) comprises a cross arm, one end of which is provided with a support leg, and the support shaft (3) is mounted on the cross arm.

5. The fire damper actuator according to claim 4, characterized in that A supporting leg is also provided at the other end of the horizontal arm, and the end of the supporting leg is provided with a relatively outward-folded supporting foot.

6. The fire damper actuator according to claim 1, characterized in that The relative outer side surface of the end portion of the valve plate molding (9) is in a step-like shape, and the step-like outer side surface is provided with serrations.

7. The fire damper actuator according to claim 1, characterized in that The hot melt sheet (5) is made of engineering plastic or nylon material.

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