JPH063625Y2 - Fire damper opening and closing device - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention relates to a device for opening / closing a damper for automatically opening / closing a lid in the event of a fire.

[Conventional technology]

Large buildings such as recent buildings, factories or theaters are fully equipped with air-conditioning equipment, and ducts are arranged vertically and horizontally inside these buildings. At the same time, it is equipped with various equipment for disaster prevention. Among them, fire and smoke prevention equipment is one of the important equipment to prevent the spread of fire when a fire occurs.

Generally, there are three elements for burning an object, that is, fuel, heat, and oxygen, and the combustion can be stopped by removing one or more of these elements.

Therefore, by installing a damper in the middle of the duct and closing the cover of the damper when a fire occurs, the fire can be shut off for each fireproof section, and damage can be minimized.

On the other hand, since the damper is connected to the middle portion of the duct as described above, most of the damper is installed in the attic or the like.

Therefore, the first condition is that the lid of the damper is automatically closed when an abnormal situation such as a fire occurs.

As a damper that adapts to this condition, conventionally, it was installed in the damper when the lid of the damper was closed by motor drive or gas pressure, etc., or when the duct became hot, in conjunction with the smoke detector and heat detector. A fire-proof damper has been developed that uses a thermal fuse that blows and the lid closes automatically.

As the lid opening / closing mechanism driven by the motor, for example, a cam plate is attached to the shaft of the lid member protruding to the outside of the damper, and the cam plate is rotated by a rotating member connected to the drive source to rotate the lid member. Some open and close.

Further, as another method, the opening operation of the lid member is performed by driving the motor, and in order to maintain the opened state, a locking mechanism is separately provided, and the closing operation is performed by the locking mechanism. There is a system in which the lid is closed by utilizing the restoring force of the biasing member which is biased in the opposite direction in advance during the opening operation by removing the lid.

(Problems to be solved by the invention) However, in the conventional motor-operated lid opening / closing mechanism that opens / closes by a motor drive, a drive source such as a motor is reversed in order to open / close the lid member. A device that rotates in both directions is required.

Further, in the system in which the lid is opened / closed by the motor driving and locking mechanism, the reverse rotation of the motor is not required, but the locking mechanism requires an auxiliary mechanism such as a solenoid.

Therefore, in any of the methods, various incidental mechanisms are attached, so it is necessary to secure a space in a narrow space such as an attic. Furthermore, the increase in incidental mechanisms causes an increase in cost and frequency of occurrence of breakdowns. Will increase.

In view of the above-mentioned drawbacks, the problem to be solved in the present invention is to provide a fire protection damper that can open and close the damper lid with a simple structure.

[Means for Solving the Problems]

In order to achieve the above object, the present invention is connected to a main shaft of a lid member protruding to the outside of a damper by urging the main shaft by a biasing member in the rotation direction of the main shaft and connecting a first portion to a cam circumferential portion.
A cam plate provided with an engaging portion of the cam plate, and an engaging member that releasably engages with the first engaging portion of the cam plate when the cam plate is at a rotation limit point in a direction opposite to the urging direction. An actuating member that rotates the cam plate in a direction opposite to the urging direction of the urging member and is provided with a second engaging portion, and a third engaging and disengaging member to the second engaging portion of the operating member. A rotary member provided with an engaging portion, a drive source for rotating the rotary member in one direction, a fuse lever connected to a fuse installed in the damper, and operated by blowout of the fuse, It is characterized by comprising an interlocking member for rotating the shaft of the lid member in conjunction with the operation of the fuse lever.

Here, the engaging member is provided with a locking roller that engages and disengages with the first engaging portion of the cam plate on one side, and a latch gear that is meshable with the drive source on the other side. Further, the rotation shaft of the latch gear may be provided at a position eccentric from the gear center. Further, the third engaging portion of the rotating member may be formed by a plurality of protrusions provided on the peripheral portion.

〔Example〕

The features of the present invention will be specifically described below with reference to the embodiments shown in the drawings.

In FIGS. 1 to 3, reference numeral 1 denotes a damper installed in an intermediate portion of a duct or the like, and three blades 2 as a lid member are rotatably mounted on the damper 1 via an interlocking rod 3. It is installed.

Among them, the blades 2a are connected to an opening / closing device 7 provided with a frame 6 via a main shaft 5 that penetrates the damper 1.

On the other hand, FIG. 4 shows a state in which the blades 2 are fully opened, and the opening / closing device 7 is a locking plate in which the main shaft 5 protruding from the base plate 8 is formed with a contoured circumferential portion 9a and a cutout portion 9b on the frame body 6. 9
Is connected and fixed, and a return plate 10 is rotatably mounted coaxially with the locking plate 9.

The return plate 10 is provided with a return lever 11 which has a hook-shaped hook 11a at one end and a protrusion 11b at the center, and which is connected to a spring 12 having one side locked to the base plate 8. Axis 10a
It is rotatably supported by.

The hooking portion 11a is rotatably supported on the base plate 8 by a shaft 14a and is provided with a return gear pin 15 provided on a peripheral portion of a return gear 14 meshed with a motor gear 13 driven by a motor (not shown). Engage with.

Further, an inverted L-shaped locking lever 16 rotatably supported by a shaft 16a is locked in the notch 9b of the locking plate 9 by a locking roller 16b provided at one end side. There is. Also,
A fan-shaped latch gear 17 provided at a position with an eccentric shaft center is connected to the other end of the locking lever 16, and the gear 17 meshes with the motor gear 13.

In this state, the blade 2 in the damper 1 is fully opened, the spring 5a connected to the main shaft 5 is wound up, and the locking plate 9
In contrast, it is biased counterclockwise.
The locking roller 16b locked in the notch 9b of the locking plate 9 locks the rotation of the locking plate 9.

In addition to the above configuration, one end side of the shaft 16a is in contact with the locking lever 16 and the other end side of which is connected to the fuse portion 4 projecting inside the damper body 1 is rotatable. Is supported by.

Further, the fuse lever 18 has a spring 18a, one end of which is locked to the frame body 6 and which is constantly loaded with a tensile force (see FIG. 9).
Are linked to.

The operation status of the switch for the fire protection damper of the present invention having the above structure is as follows.

In the normal state, as shown in FIGS. 1 to 3, the blade 2 of the damper 1 is set to the fully open state.

Next, when a fire or the like occurs in the building, the motor gear 13 rotates counterclockwise by an operation signal from the heat or smoke detector.

By this rotation, as shown in FIGS. 5 and 6, the latch gear 17 meshing with the motor gear 13 first rotates clockwise. Since the latch gear 17 is provided at the position where the shaft center is eccentric as described above, the latch gear 17 is pushed out in the direction of arrow A as it rotates.

With this movement, the locking lever 16 rotates clockwise,
The locking roller 16b moves in the B direction.

As a result, the engagement state between the engagement plate 9 and the engagement roller 16b is released, and the spring that has been in the fully open state and is connected to the main shaft 5 until now.
The locking plate 9 urged counterclockwise by 5a rotates, and the blades 2 connected via the locking plate 9 rotate until they come in contact with the blade contact stop plate 2b to be in a closed state. .

When the closing operation of the blade 2 is completed, as shown in FIG. 6, the locking roller 16b is on the circumferential portion 9a of the locking plate 9,
Therefore, the latch gear 17 is separated from the motor gear 13.

At this time, the return gear 14 is in a state of being rotated about 30 degrees as compared with the fully open state of the blade 2 in FIG. 4, and the return gear pin 15 immediately before being engaged with the hooking portion 11a provided on the return lever 11 is shown. It is stopped at the position.

Next, a returning operation for fully opening the blade 2 will be described.

When the motor gear 13 rotates counterclockwise by the return actuation signal, the return gear 14 rotates clockwise as shown in FIGS. 7 and 8 with this rotation.

The return gear 14 is provided with two return gear pins 15 symmetrically with respect to the shaft 14a. Therefore, one of the return gear pins 15 is engaged with the hook portion 11a, and the hook portion 11a
In the tangential direction of the return gear pin 14.

Along with this operation, the return plate 10 also rotates clockwise, the end 10b of the return plate 10 and the projection 9c provided on the locking plate 9 come into contact with each other, and the locking plate 9 also moves clockwise. By rotating, the blade 2 starts to open via the main shaft 5.

Further, the locking plate 9 rotates and the locking roller 16b provided on the locking lever 16 fits into the notch 9b.

At the same time, a protrusion 11b provided at the center of the return lever 11
Comes into contact with the boss portion 14b of the return gear 14, the movement of the return lever 11 is stopped, and the engagement state between the return gear pin 15 and the hook portion 11a is released.

As a result, the return lever 11 is pulled back to the original position by the spring 12, and the blade 2 is returned to the fully open state shown in FIG.

On the other hand, when the fluid temperature in the duct (not shown) reaches an abnormally high temperature, the fuse provided in the fuse portion 4 installed in the damper 1 is melted, and the fuse lever 18 and the fuse portion 4 are melted. The connection with is cut off.

As a result, as shown in FIG. 9, the restoring force of the spring 18a causes the fuse lever 18 to rotate clockwise, and the tip of the fuse lever 18 presses the engaging lever 16, causing the engaging lever 16 to rotate clockwise. As a result, the locking roller 16b is disengaged from the notch 9b, and the blade 2 is closed by the same operation as described above.

Furthermore, the same applies when manually returning to the reset state.
As shown in FIG. 10, the blade 2 can be closed by rotating the manual handle clockwise about the shaft 16a and removing the locking roller 16b from the notch 9b.

[Effect of device]

As described above, in the opening / closing device for the fire damper of the present invention, the engaging member that is disengageably engaged with the engaging portion of the cam plate is disengaged with the engaging portion of the cam plate on one side. A locking roller and a latch gear that can mesh with the drive source are provided on the other side, and the rotation shaft of the latch gear is provided at a position eccentric from the gear center.

Further, the engaging portion of the rotating member that engages and disengages with the engaging portion of the actuating member is formed by a plurality of protrusions provided on the peripheral portion.

Therefore, since the latch gear is pushed out in the rotational direction as the drive source rotates, the locking roller disengages from the engaging portion of the cam plate, and the closing operation of the lid member is performed.

Further, the closed lid member rotates the cam plate via the engaging portion of the rotating member that is connected to the drive source and rotates in the same direction as the closing operation, and the cam plate is engaged with the engaging portion. When the locking roller is locked, it returns to the opened state.

From the above, the fire damper opening / closing device of the present invention can open and close the lid member by rotating the drive source for rotating the rotating member in one direction.
Since the rotary member is provided with the plurality of protrusions, the lid member can be opened and closed in a short rotation angle, that is, in a short time.

[Brief description of drawings]

FIG. 1 is a front view showing a mounting state of a switch for a fire damper of the present invention, FIG. 2 is a side view of the same, and FIG. 3 is an overall perspective view.
FIG. 4 is a plan sectional view showing details of the switchgear in a normal state,
FIG. 5 is a plan sectional view showing a transitional state of the closing operation, FIG. 6 is a plan sectional view showing a completed state of closing, and FIGS. 7 and 8 are plan sectional views showing a state during transition to a fully opened state. FIG. 9 is a plan sectional view showing the closing operation by the thermal fuse device,
FIG. 10 is an explanatory diagram showing a manual closing operation. 1: Damper body, 2: Blade, 3: Interlocking rod, 4: Fuse part, 5: Main shaft, 6: Frame body, 7: Opening / closing device, 8: Base plate, 9: Locking plate, 9a: Circumferential part, 9b: Notch part, 9c : Protrusion 10: Return plate, 10a: Shaft 11: Return lever, 11a: Hook portion 11b: Protrusion, 12: Spring 13: Motor gear, 14: Return gear 14a: Shaft, 14b: Boss portion 15: Return gear pin , 16: Locking lever 16a: Shaft, 16b: Locking roller 17: Latch gear, 18: Fuse lever 19: Handle

Claims (3)

[Scope of utility model registration request] 1. A cam plate, which is connected to a main shaft of a lid member protruding to the outside of the damper in a rotational direction of the main shaft by an urging member and which is provided with a first engaging portion on a cam circumferential portion. ,
An engaging member that releasably engages with the first engaging portion of the cam plate when the cam plate is at a rotation limit point in the direction opposite to the urging direction; and the cam plate of the urging member. An operating member that rotates in a direction opposite to the biasing direction and that has a second engaging portion; and a rotating member that has a third engaging portion that engages and disengages with the second engaging portion of the operating member, A drive source that rotates the rotating member in one direction, a fuse lever that is connected to a fuse installed in the damper, and operates by blowout of the fuse, and the lid member that interlocks with the operation of the fuse lever. An opening / closing device for a fire-proof damper, which comprises an interlocking member for rotating the shaft of the. 2. The engaging member is provided on one side with a locking roller that engages and disengages with the first engaging portion of the cam plate, and on the other side with a latch gear that is meshable with the drive source. The opening / closing device for a fire protection damper according to claim 1, further comprising a rotary shaft of the latch gear provided at a position eccentric from a gear center. 3. The opening / closing device for a fire protection damper according to claim 1, wherein the third engaging portion of the rotating member is formed by a plurality of protrusions provided on a peripheral portion.