Actuator for fire damper

Abstract

The present invention discloses an actuator for a fire damper, which comprises a bracket. A support shaft is provided on the bracket, and a locking pressure plate is sleeved on the support shaft. A pressure plate compression spring is sleeved on the support shaft between the locking pressure plate and the bracket. One end of the support shaft close to the locking pressure plate is hinged with a valve piece pressing strip corresponding to the locking pressure plate. A hot melt sheet that extends towards the locking pressure plate and can melt or separate at a set temperature is provided at the bracket part. The locking pressure plate is provided with a claw that extends towards the hot melt sheet and is clamped on the hot melt sheet. An inwardly arranged valve piece pressing strip guiding groove is provided along the relative outer side of the locking pressure plate, and a clamping groove is provided inside the valve piece pressing strip guiding groove. A hook that is buckled in the clamping groove is provided on the valve piece pressing strip. When the two valve piece pressing strips are opened, the two valve piece pressing strips are in a locked state. The present invention is applied to a fire damper in an air duct or using a longitudinal common flue gas duct. This actuator forcibly closes the valve piece in the open state and keeps it in a locked closed state, thereby protecting the lives of residents.

Description

Technical Field

[0001] The present invention relates to a fire damper, and particularly to an actuator for a fire damper. Background Art

[0002] In modern social buildings, ventilation equipment is essential. Since the air duct is an important component of the building ventilation equipment, and the fire damper in the air duct is an important part thereof. The fire damper includes a valve body, and an openable valve plate is provided in the valve body. When the flue gas temperature in the air duct reaches a certain value, the valve plate should be closed to block the smoke and fire. In a kitchen using a longitudinal common flue gas duct, in order to prevent the fumes in the flue gas duct from flowing back into the kitchen, a device such as a flue fire damper is generally provided between the air outlet of the range hood and the common flue gas duct. The existing flue fire damper generally includes a flue gas passage formed by a housing. The flue gas passage has opposite air inlets and air outlets. The air inlet is connected to the air outlet of the range hood, and the air outlet extends into the common flue gas duct. A closable valve plate is provided at the air outlet of the flue gas passage. The valve plate is one or two pieces and is hinged to the flue gas passage through a valve plate rotating shaft. A high-temperature closing device capable of forcibly closing the valve plate is provided on the air outlet side. When the range hood is not in use, the valve plate is in the closed position due to its own gravity and covers the air outlet part; when the range hood is in use, the valve plate is in the open position and the valve plate is away from the air outlet. Since multiple users share a longitudinal common flue gas duct, once a fire occurs in one household, a large amount of high-temperature harmful gases will pour into the longitudinal common flue gas duct. At this time, if the valve plate in the flue fire damper is not closed in time, these large amounts of high-temperature harmful gases will enter the homes of users using the range hood through the flue gas passage of the flue fire damper, thus threatening the lives of the residents. The existing flue fire damper is provided with a high-temperature closing device on the outer end surface of the air outlet end that can forcibly close the valve plate toward the air inlet side at a set temperature. When the flue gas temperature in the common flue gas duct is in a very high emergency state and reaches the set warning temperature, the high-temperature closing device forcibly closes the open valve plate. However, the high-temperature closing devices on the existing flue fire dampers all use the force of a spring to close the valve plate. When the high temperature in the common flue gas duct lasts for a certain period of time, the spring fails due to the high temperature, and the valve plate loses the restraint force of the spring and will be opened again, and the high-temperature harmful gases will pour into the user's home, thus threatening the lives of the residents. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide an actuator for a fire damper that can forcibly close the valve plate of the fire damper when the flue gas temperature in the common flue gas duct is in a very high emergency state, and the valve plate of the fire damper is always in the closed state.

[0004] To solve the above technical problems, the present invention includes a bracket, and its structural feature is that a support shaft is provided on the bracket, a locking pressure plate is sleeved on the support shaft, a pressure plate compression spring is sleeved on the support shaft between the locking pressure plate and the bracket, a valve plate pressing strip corresponding to the locking pressure plate is hinged at one end of the support shaft close to the locking pressure plate, a hot melt sheet extending towards the locking pressure plate and capable of melting or separating at a set temperature is provided at the bracket part, the locking pressure plate and the hot melt sheet are interlocked with each other, a valve plate pressing strip guiding groove arranged inward is provided along the relative outer side of the locking pressure plate, a clamping groove is provided inside the valve plate pressing strip guiding groove, and a hook buckled in the clamping groove is provided on the valve plate pressing strip.

[0005] An outward flange is provided on the relative outer side of the valve plate pressing strip.

[0006] The locking pressure plate is generally strip-shaped as a whole, a hole sleeved with the support shaft is provided in the middle part of the locking pressure plate, valve plate pressing strip guiding grooves arranged inward are provided at both ends of the locking pressure plate along the length direction, clamping grooves are provided at the relative inner ends of the two valve plate pressing strip guiding grooves, a claw is provided on one side of the locking pressure plate in the width direction, and the clamping groove and the guiding groove are separated by a partition strip.

[0007] Both ends of the locking pressure plate in the length direction are bent towards the same side along the junction of the valve plate pressing strip guiding groove and the clamping groove.

[0008] The hot melt sheet is a bimetallic sheet formed by welding two metal sheets with a welding material capable of melting at a set temperature.

[0009] The valve plate pressing strips are two symmetrically arranged ones.

[0010] The bracket includes a cross arm, a leg is provided at one end of the cross arm, and the support shaft is installed on the cross arm; a leg is also provided at the other end of the cross arm, and an outwardly folded foot is provided at the end of the leg.

[0011] As another technical solution, the present invention includes a bracket, and its structural feature is that a support shaft is provided on the bracket, a locking pressure plate is sleeved on the support shaft, a pressure plate compression spring is sleeved on the support shaft between the locking pressure plate and the bracket, a valve plate pressing strip corresponding to the locking pressure plate is hinged at one end of the support shaft close to the locking pressure plate, a non-metallic hot melt sheet extending towards the locking pressure plate and capable of melting or separating at a set temperature is provided at the bracket part, the locking pressure plate and the hot melt sheet are interlocked with each other, a valve plate pressing strip guiding groove arranged inward is provided along the relative outer side of the locking pressure plate, a clamping groove is provided inside the valve plate pressing strip guiding groove, and a hook buckled in the clamping groove is provided on the valve plate pressing strip.

[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 sleeved on the support shaft, a pressure plate compression spring is sleeved on the support shaft between the locking pressure plate and the bracket, and a valve plate pressing strip corresponding to the locking pressure plate is hinged at one end of the support shaft close to the locking pressure plate. When the heat-melting sheet is heated to reach the set temperature and melts or separates, the locking pressure plate is released from the restraint of the heat-melting sheet. Under the action of the pressure plate compression spring, it slides along the support shaft and presses against the valve plate pressing strip. At this time, the hook on the valve plate pressing strip forms a chute with the relatively inner side surface of the valve plate pressing strip during the unfolding process of the valve plate pressing strip. The outer edge of the partition strip slides along this chute, and the outer edge of the partition strip between the card slot and the guiding slot is buckled inside the hook, so that the two valve plate pressing strips are in a locked state. The locking pressure plate presses against the two valve plate pressing strips and makes the two valve plate pressing strips open outward and press on the valve plate of the fire damper. Since the valve plate pressing strips are in a locked state, the valve plate is always in a closed state. The actuator for the fire damper of the present invention is applied in the air duct or the fire damper using a longitudinal common flue. When the flue gas temperature in the air duct or the common flue is in a very high emergency state and reaches the set warning temperature, the actuator forcibly closes the valve plate in the open state, and the valve plate of the fire damper is always in a locked closed state, thus protecting the lives of the residents. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The following further describes in detail the specific embodiments of the present invention in conjunction with the drawings:

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

[0016] Figure 2 is Figure 1 the A-A sectional structural diagram of

[0017] Figure 3 is Figure 1 the structural diagram of the locking pressure plate in

[0018] Figure 4 is Figure 2 the state diagram when the valve plate pressing strip in

[0019] Figure 5 is a schematic structural diagram of another implementation state of the present invention;

[0020] Figure 6 is a schematic structural diagram of a specific application example of the present invention;

[0021] Figure 7 is Figure 6 the right view structural diagram. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0022] Referring to the attached drawings, the actuator for the fire damper includes a bracket 1, and a support shaft 3 is provided on the bracket 1. The bracket 1 includes a cross arm, one end of the cross arm is provided with a leg, the support shaft 3 is installed on the cross arm, and legs can also be provided at the other end of the cross arm. The end of the leg is provided with a foot that is folded outward relatively, which is convenient for installing the bracket 1 at the corresponding part of the fire damper. One end of the support shaft 3 is provided with a threaded section, and a support shaft installation hole is provided on the cross arm of the bracket 1. The end of the support shaft 3 with the threaded section passes through the support shaft installation hole and is fixed on the cross arm of the bracket 1 through a nut. A lock pressing disc 7 is sleeved on the support shaft 3, and a disc pressing spring 2 is sleeved on the support shaft 3 between the lock pressing disc 7 and the bracket 1. A heat melting sheet 5 that extends towards the lock pressing disc 7 and can melt or separate or break at a set temperature is provided at the position of the bracket 1. The heat melting sheet 5 can be a heat melting wire. The shape of the heat melting sheet 5 can be sheet-shaped, strip-shaped, column-shaped, etc. In actual application, the heat melting sheet 5 can also be replaced with a non-metallic material, such as an engineering plastic or nylon that can melt or separate or break at a set temperature. The lock pressing disc 7 is provided with a claw 6 that extends towards the heat melting sheet 5 and is clamped on the heat melting sheet 5. A card slot for the claw 6 to be inserted into is correspondingly provided on the heat melting sheet 5, or the heat melting sheet 5 is provided with a claw that extends towards the lock pressing disc 7 and is clamped on the lock pressing disc 7, and a card hole or card slot corresponding to the claw is provided on the lock pressing disc 7, so that a mutual locking relationship is formed between the lock pressing disc 7 and the heat melting sheet 5. In this embodiment, the heat melting sheet 5 is a bimetallic sheet formed by welding two metal sheets with a welding material that can melt at a set temperature, or a bimetallic sheet formed by inserting pins or cards made of a heat melting material that can melt at a set temperature. The bimetallic sheet is in a crank arm shape, and an installation hole corresponding to the support shaft installation hole of the bracket 1 is provided on one of the crank arms. The bimetallic sheet is sleeved on the support shaft 3, and the support shaft 3 is fixed on the bracket 1 through a nut. Of course, the bimetallic sheet can be directly installed on the bracket. A valve plate pressing strip 9 corresponding to the lock pressing disc 7 is hinged at one end of the support shaft 3 close to the lock pressing disc 7. A notch is opened at the end of the support shaft 3, and the valve plate pressing strip 9 is hinged in the notch through a hinge shaft 8. The valve plate pressing strip 9 is provided with two branches symmetrically arranged along the support shaft 3. The free end of the valve plate pressing strip 9 is in a knife head shape, and a flange that protrudes outward is provided on the relative outer side of the valve plate pressing strip 9, and the flange protrudes from the relative outer side surface of the valve plate pressing strip 9. An inwardly provided valve plate pressing strip guiding groove 11 is provided along the relative outer side of the lock pressing disc 7, and a card slot 10 is provided inside the valve plate pressing strip guiding groove 11. A hook 4 that is buckled in the card slot 10 is provided on the valve plate pressing strip 9. See Figure 2 、 Figure 3, the locking pressure plate 7 is generally strip-shaped as a whole. A hole sleeved with the support shaft 3 is provided in the middle part of the strip-shaped locking pressure plate 7. Valve strip guide grooves 11 are provided at both ends along the length direction of the strip-shaped locking pressure plate 7 and are arranged inward. Claw slots 10 are provided at the relative inner ends of the two valve strip guide grooves 11. A claw 6 is provided on one side in the width direction of the strip-shaped locking pressure plate 7. Both ends in the length direction of the locking pressure plate 7 are bent toward the same side (toward the end with the notch of the support shaft 3) at the intersection of the valve strip guide groove 11 and the claw slot 10. The locking pressure plate 7 is integrally formed by one-time stamping of a steel plate. When the two valve strips 9 are in the locked state, the hooks 4 provided on the valve strips 9 (which are located on the relative inner sides of the valve strips 9 at this time) are buckled in the claw slots 10 of the locking pressure plate 7. The two valve strips 9 are respectively located in the guide grooves 11. The claw slot 10 and the guide groove 11 are separated by a partition strip. When the two valve strips 9 are opened, the two valve strips 9 are generally in a symmetric and parallel state. The outer edge of the partition strip between the claw slot 10 and the guide groove 11 is buckled in the hook 4, so that the two valve strips 9 are in the locked state.

[0023] See Figure 6 , Figure 7A specific application example shown is a flue fire damper applied to a common flue. The flue fire damper includes a flue gas passage formed by a housing 12. The flue gas passage is cylindrical. One end of the flue gas passage has an air inlet 13, and the opposite end is the air outlet end. At the air outlet end, there is an end face 15 adapted to the flue gas passage. An air outlet is provided on the end face 15. A rotatable valve plate 14 that can only open in the air outlet direction and corresponds to the air outlet is provided on the end face 15. An installation disk is provided on the outer wall of the housing 12. The installation disk is integrally processed with the flue gas passage forming the air inlet 13. After being stamped, the end face 15 is fixedly connected to the installation disk. Two air outlets are provided on the end face at the air outlet end. A boss or groove facing the outer end face (the outer end face faces the air outlet direction of the flue gas passage) is provided around the air outlets. Two rotatable valve plates 14 that can only open in the air outlet direction and correspond to the air outlets are provided on the outer end face at the air outlet end. The two air outlets are symmetrically arranged left and right on the end face at the air outlet end. The end face at the air outlet end and the upper ends of the two valve plates 14 are inclined towards the air inlet 13 direction. The periphery of the valve plate 14 is provided with a bent edge or a rib corresponding to the aforementioned boss or groove. A fire damper actuator for forcibly closing the valve plate 14 when the set temperature is reached is provided on the end face 15, so that the valve plate 14 is always in the closed state. In this embodiment, a notch is opened at one end of the support shaft 3 close to the valve plate 14. A valve plate pressing strip 9 is hinged in the notch through a hinge shaft 8. The valve plate pressing strip 9 is composed of two branches symmetrically arranged along the support shaft 3. The two branches of the valve plate pressing strip 9 are respectively arranged corresponding to the two valve plates 14. An outward flange is provided on the relative outer side of the valve plate pressing strip 9 to facilitate the valve plate pressing strip 9 to press the valve plate 14. When the flue gas temperature in the common flue reaches the set warning temperature, the solder between the bimetal sheets melts, and one sheet falls off from the other sheet. The locking pressure disk 7 is released from the restraint of the bimetal sheet and slides along the support shaft 3 under the action of the pressure disk compression spring 2. At this time, a chute is formed between the hook 4 on the valve plate pressing strip 9 and the relative inner side surface of the valve plate pressing strip 9 during the unfolding process of the valve plate pressing strip 9. The outer edge of the spacer strip slides along this chute. The locking pressure disk 7 presses against the two valve plate pressing strips 9 and makes the two valve plate pressing strips 9 open outward and press on the two valve plates 14. Since the valve plate pressing strip 9 is in the locked state, the valve plate 14 is always in the closed state.

[0024] Figure 6 , Figure 7 In the specific application example shown, the flue fire damper has an end face at the air outlet end adapted to the flue gas passage. Two air outlets are provided on the end face. A rotatable valve plate that can only open in the air outlet direction and corresponds to the air outlet is provided on the end face. The fire damper actuator for forcibly closing the valve plate is Figure 1The double-leg structure shown. In actual application, due to the diversity of the structure of the flue fire damper itself, for example: the valve plate is arranged in the flue gas passage of the fire damper, the flue gas passage can also be a variable-diameter passage, the valve plate can be two pieces or one piece, and the opening direction of the valve plate can be opposed opening, side opening, upward opening, downward opening, etc. To adapt to the forced closing of the valve plates of flue fire dampers with different structures, the actuator for the fire damper used to forcibly close the valve plates can also adopt Figure 5 the single-leg structure shown, which is convenient for installing the actuator for the fire damper at the corresponding part of the flue fire damper, such as installing it on the end face of the air outlet through the support feet with the outer folds at the ends of the support legs, or installing it on the mounting plate of the flue fire damper and on the side wall of the outer shell of the flue fire damper.

[0025] The specific structures of the above embodiments are for illustrating the present invention rather than limiting the present invention. All improvements based on the present invention shall fall within the protection scope of the present invention.

Claims

1. An actuator for a fire damper, comprising a bracket (1), characterized in that A support shaft (3) is provided on the bracket (1), a locking pressure plate (7) is sleeved on the support shaft (3), a pressure plate compression spring (2) is sleeved on the support shaft (3) between the locking pressure plate (7) and the bracket (1), one end of the support shaft (3) close to the locking pressure plate (7) is hinged with a valve piece pressing strip (9) corresponding to the locking pressure plate (7), a hot melt sheet (5) that extends towards the locking pressure plate (7) and can melt or separate at a set temperature is provided at the bracket (1) part, the locking pressure plate (7) and the hot melt sheet (5) are interlocked with each other, an inwardly arranged valve piece pressing strip guiding groove (11) is provided along the relative outer side of the locking pressure plate (7), and a clamping groove (10) is provided inside the valve piece pressing strip guiding groove (11). A hook (4) that is buckled in the clamping groove (10) is provided on the valve piece pressing strip (9).

2. The actuator for a fire damper according to claim 1, characterized in that An outward flange is provided on the relative outer side of the valve piece pressing strip (9).

3. The actuator for the fire damper according to claim 1, characterized in that The locking pressure plate (7) is generally in a strip plate shape as a whole. A hole sleeved with the support shaft (3) is provided in the middle part of the locking pressure plate (7). Inwardly arranged valve piece pressing strip guiding grooves (11) are provided at both ends of the locking pressure plate (7) along the length direction. Clamping grooves (10) are provided at the relative inner ends of the two valve piece pressing strip guiding grooves (11). A claw (6) is provided on one side of the locking pressure plate (7) in the width direction. The clamping groove (10) and the guiding groove (11) are separated by a partition strip.

4. The actuator for the fire damper according to claim 3, characterized in that Both ends of the locking pressure plate (7) in the length direction are bent towards the same side along the junction of the valve piece pressing strip guiding groove (11) and the clamping groove (10).

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

6. The actuator for the fire damper according to claim 1, characterized in that The valve piece pressing strips (9) are two symmetrically arranged ones.

7. The actuator for a fire damper according to any one of claims 1 - 6, characterized in that The bracket (1) includes a cross arm, and a leg is provided at one end of the cross arm. The support shaft (3) is installed on the cross arm.

8. The actuator for a fire damper according to claim 7, characterized in that Legs are also provided at the other end of the cross arm, and the ends of the legs are provided with outwardly folded feet.

9. An actuator for a fire damper, comprising a bracket (1), characterized in that A support shaft (3) is provided on the bracket (1), a locking pressure plate (7) is sleeved on the support shaft (3), a pressure plate compression spring (2) is sleeved on the support shaft (3) between the locking pressure plate (7) and the bracket (1), one end of the support shaft (3) close to the locking pressure plate (7) is hinged with a valve piece pressing strip (9) corresponding to the locking pressure plate (7), a non-metallic hot melt sheet (5) that extends towards the locking pressure plate (7) and can melt or separate at a set temperature is provided at the bracket (1) part, the locking pressure plate (7) and the hot melt sheet (5) are interlocked with each other, an inwardly arranged valve piece pressing strip guiding groove (11) is provided along the relative outer side of the locking pressure plate (7), and a clamping groove (10) is provided inside the valve piece pressing strip guiding groove (11). A hook (4) that is buckled in the clamping groove (10) is provided on the valve piece pressing strip (9).

10. The actuator for a fire damper according to claim 9, characterized in that The non-metallic hot melt sheet (5) is made of engineering plastic or nylon material.

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