JPH0431081Y2 - - Google Patents

Description

[Detailed explanation of the idea] [Industrial application field]

The present invention relates to an automatic return device for a smoke exhaust port that is installed at the room-side opening of a smoke exhaust duct and returns the opened smoke exhaust port to a closed state in the event of a fire outbreak or during maintenance. This invention relates to an automatic return device for a smoke exhaust port, which allows the return operation to be easily performed, allows the return operation to be performed manually even in the event of a power outage, and alleviates the impact caused by the closure of the blades.

[Conventional technology]

In recent years, fires often generate large amounts of smoke, and structures such as buildings are required to remove evacuation obstacles caused by smoke, especially in the early stages of a fire outbreak.
Smoke extraction equipment has been installed to buy time for people to evacuate. For example, as shown in FIG. 5, this is a smoke exhaust duct 32 having an exhaust fan 31 at its open end.
and a smoke exhaust port 3 provided at an opening 33 on each room side of this smoke exhaust duct 32 (mainly near the ceiling), and this smoke exhaust port 3 includes a drive device (not shown) for opening and closing the blade 1; It is comprised of a smoke outlet control device (not shown), etc., including a sensor, etc. that detects smoke and activates the drive device. In order to ensure reliable operation, this drive device generally uses a mechanical mechanism using a reaction force such as a spring.

[Problem that the invention attempts to solve]

The smoke exhaust vents described above need to be opened and closed not only during actual operation, but also for maintenance during normal times. However, in the conventional smoke exhaust vent as described above, the return operation is not easy, partly because the smoke exhaust vent is installed at a high position. This led to problems such as neglect of daily maintenance.

[Means to solve the problem]

In order to solve the above-mentioned problems, the present invention provides a smoke exhaust vent that is equipped with a blade that opens and closes the inside of the duct, an elastic member that biases the duct in the opening direction, and a lock mechanism that restricts the operation of the elastic member. The automatic return device of the smoke exhaust port that returns the blade to the closed state is rotated in the direction in which the other end of the string connected to the blade is wound and the string is wound up, thereby causing the blade to close. A pulley that rotates, a drive motor that rotates the pulley, and a drive motor that is installed between the drive motor and the pulley and meshes with the pulley as the drive motor rotates in the forward direction to transmit the rotation of the drive motor, and as the drive motor rotates in the reverse direction, the pulley a clutch that disengages the casing, a spiral spring that is stretched between the pulley rotation shaft and the casing and biases the pulley in the direction of rotation in which the string is wound, and a one-sided joint that connects the pulley to the rotation shaft. The pulley is configured with a shock absorber that slows down the rotation speed when the pulled pulley rotates in the direction of pulling out the string.

[Effect]

According to such an automatic return device, the torque of the drive motor is transmitted to the pulley for winding up the cord through the clutch, which is engaged and disengaged in the forward and reverse directions of the drive shaft, so that the drive motor is not activated. The smoke exhaust vent can be closed by simply opening the smoke exhaust vent, making remote control possible, and since the drive motor and pulley are usually separated, there is no need for the drive motor to interfere with the operation of the smoke exhaust vent when it opens. It never becomes. Since a spiral spring is attached that biases the pulley in the direction in which the string whose one end is connected to the blade is wound around the pulley, it can be returned manually without using the drive motor. . Furthermore, since the shock absorber provided through the one-way joint operates to reduce the rotational speed only when the smoke exhaust port is opened, no unnecessary load is placed on the drive motor or human power when returning.

[Embodiment] An embodiment of the present invention will be described below with reference to the drawings. First, the smoke exhaust port 3 to which the automatic return device A of the present invention is attached will be explained with reference to FIG. This blade 1 is the duct casing 2
The rotary shaft 4 is rotatably supported by a rotary shaft 4 installed in a, and the rotary shaft 4 is provided with an elastic member S that biases the rotary shaft 4 in the direction of opening. This elastic member S is a rod-shaped spring member whose center part is wound into a coil shape, and when it is biased, one end side reinforces the rotating shaft 4 between the casing 2a and maintains the open position of the blade 1. is engaged with the side of the regulating beam member 5, and the other end is engaged with the upper surface of the blade 1,
Further, a coil-shaped central portion is wound around the rotating shaft 4. Further, a lock mechanism B locks the blade 1 against the bias of the elastic member S in the closed position of the blade 1, and a smoke exhaust port control device (not shown) that releases the lock mechanism B and opens the blade 1. ) etc. are provided. The locking mechanism B employs a well-known locking mechanism _B1 that is used, for example, when opening and closing a door, and is further provided with a wire or the like for manually releasing the locking mechanism B. . 1 to 3 show the automatic return device A, and in these figures, reference numeral 6 indicates a string whose one end is tied to the free end of the blade 1, and reference numeral 7 indicates the other end of this string 6. is fixed and wound around a pulley for winding up the string 6; reference numeral 8 denotes a drive shaft connected to a drive motor 9 via a reducer 10;
Reference numeral 11 indicates a clutch that engages with the pulley 7 as the drive shaft 8 rotates in the normal direction to transmit the rotation, and disengages the engagement with the pulley 7 as the drive shaft 8 rotates in the reverse direction. a spiral spring, reference numeral 1, which is stretched between the coils and urges the pulley 7 in the direction of rotation in which the string 6 is wound;
Reference numeral 4 designates a shock absorber connected to the rotating shaft 7a through a one-way joint 15, which slows down the rotation speed of the pulley 7 when it rotates in the direction in which the string 6 is pulled out. Note that, hereinafter, the forward rotation direction refers to the direction in which the pulley 7 rotates in the direction in which the string 6 is wound up and closes the blade 1, and the term reverse rotation refers to the direction in which the pulley 7 rotates in the direction in which the string 6 is wound back. The direction in which the blade 1 is rotated to open the blade 1 is shown. The clutch 11 includes a shaft 16 whose one end is connected to the drive shaft 8 and whose other end is inserted into the shaft hole 7b of the pulley 7, a first clutch portion 17 externally mounted on the shaft 16, and a first clutch portion 17. a sliding friction plate 18 provided on the outside of the pulley 7, a second clutch portion 19 integrally formed with the pulley 7, and a first
The spring 20 is inserted into the shaft 16 in a space between the clutch portion 17 and the second clutch portion 19 and biases the first clutch portion 17 toward the drive shaft 8 with respect to the shaft 16. As shown in FIG. 2, the first clutch portion 17 has a spiral groove 21 formed on the side of the drive shaft 8, which protrudes from the shaft 16 when the shaft 16 rotates in the normal rotation direction. Pin 22
By sliding this spiral groove 21, the first clutch portion 17 is pushed out toward the second clutch portion 19 side, and the first clutch portion 17 and the second clutch portion 1 are
9 are engaged, the pin 22 hits the spiral groove 21 and the first clutch portion 17 and the second clutch portion 19
It is designed to rotate. The sliding friction plate 18 prevents the first clutch portion 17 from rotating when the pin 22 moves within the spiral groove 21, and prevents the first clutch portion 17 from rotating.
It helps the forward movement of both clutch parts 17,
19 is adjusted by a threaded pin 23 shown in FIG. 3 so as not to rub so strongly as to suppress its rotation after they are engaged. On the end surface of the first clutch section 17 that butts against the second clutch section 19, a second meshing tooth section 24 is formed on the end surface on the second clutch section 19 side.
A first meshing tooth portion 25 that meshes with the first meshing tooth portion 25 is formed.
Here, the fixing part 40 into which the screw pin 23 is screwed is
It is fixed to the inner wall of a casing 41 that covers the entire automatic return device A. A rotary shaft 7a fixed to the surface of the pulley 7 opposite to the second clutch portion 19 is connected to the casing 1.
3, and this rotating shaft 7
A and the casing 13 are connected to each other with the rotating shaft 7a in the forward rotation direction (the rotation direction in which the pulley 7 winds the string 6).
A spiral spring 12 is tensioned. The biasing force of this spiral spring 12 is set to be slightly weaker than the biasing force of the elastic member S of the smoke exhaust port. Further, a shock absorber 14 is provided at the other end of the rotating shaft 7a via a one-way joint 15. This shock absorber 14 has a disk 2 on a shaft 27.
8 is attached, and a viscous fluid chamber 29 is provided around this disc 28.
5 exerts a resistance action only on the reverse rotation axis of the rotation shaft 7a, and the rotation shaft 7a idles when rotating in the forward direction. Further, a control device is provided to control starting, stopping, and rotational direction of the drive motor 9. As an example of the function of this control device, when the blade 1 of the smoke exhaust port is in a closed state, a self-evident limit switch mechanism senses the closed state.
A signal is sent from the limit switch mechanism to the control device to stop or reverse the drive motor 9. This causes the drive motor 9
This prevents overload operation of the pulley 7, and also prevents the string 6 wound around the pulley 7 from stretching or breaking. Next, the operation of the smoke exhaust port automatic return device A constructed as described above will be described. As shown in phantom lines in FIG. 4, when the smoke outlet is operated and opened, the string 6 engaged with the free end of the blade 1 is pulled out from the pulley 7. When the drive motor 9 is rotated in the forward direction, the drive shaft 8 rotates, and the pin 22 slides in the helical groove 21 of the first clutch portion 17. At this time, since the rotation of the clutch portion 17 is suppressed by the action of the friction sliding plate 18, the first meshing tooth portion 25 of the first clutch portion 17 meshes with the second meshing tooth portion 24 of the second clutch portion 19. be advanced until When both the meshing teeth 24 and 25 mesh, the rotation of the drive shaft 8 is transmitted to the pulley 7, the string 6 is wound up, and the blade 1 of the smoke exhaust port is closed. At this time, while the elastic member S that operates the smoke exhaust port is biased, the blade 1
is locked by lock mechanism B. When the vane 1 is locked, the limit switch mechanism senses its closed state, and the limit switch mechanism sends a signal to the control device, which in turn sends a signal to reverse the drive motor 9 and close the pin 22 and spring 20. The first drive clutch part 17 is pushed back and is separated from the second clutch part 19, and the smoke exhaust port becomes ready for starting. In addition, during the above-mentioned automatic return, when a signal to operate the smoke exhaust port is issued from the smoke exhaust port control device, the drive motor 9 stops normal rotation and is reversed, and the engagement of the clutch 11 is released to return to the starting state. The smoke exhaust vent is now operational. Furthermore, if the restoration power source is cut off due to a power outage or the like during restoration, the drive motor 9 is immediately reversed by another power source, the clutch 11 is disengaged, and the blade 1 is automatically opened by the reaction force of the elastic member S. Further, during maintenance of the smoke exhaust port, or in the event of a power outage, it is necessary to manually restore the smoke exhaust port. In this case, if the blade 1 is rotated in the closing direction against the reaction force of the elastic member S until the locking mechanism B is locked, the string 6 is wound up by the reaction force of the spiral spring 12 and initialized. become a state. In such opening/closing operations, the one-way joint 1
Shock absorber 1 connected to pulley 7 via 5
Due to the action of 4, when the smoke exhaust port is activated (when the blade 1 opens), the rotational speed of the blade 1 is slowed down and the impact when it hits the duct casing 2a is eased, and when it is returned to its original state, it spins idle and is automatically or manually returned. It is designed so that it does not interfere with As described in detail above, according to this automatic return device, the smoke exhaust port can be closed simply by operating the drive motor 9, remote control is possible, and when the smoke exhaust port opens, the drive motor 9 This does not impede the operation of the smoke exhaust port, and manual return without using the drive motor 9 can be performed without any problem. Further, a spiral spring 12 is attached which urges the pulley 7 in a direction in which the string 6 whose one end is connected to the blade 1 is wound around the pulley 7, and by the action of the one-way joint 15, the shock absorber Since the rotation speed is reduced only when the smoke exhaust port is opened, no unnecessary load is placed on the drive motor 9 or human power when returning. Furthermore, safety is maintained by opening the smoke exhaust port even if an activation signal is issued during automatic return.

[Effect of the idea]

The present invention includes a string connected to a blade of a smoke exhaust port,
a pulley around which the other end of the string is wound and which rotates the blade in the closing direction by rotating in the direction in which the string is wound; a drive motor that drives the pulley; and a drive motor that drives the pulley. A clutch is provided between the pulley and the casing, and a clutch is provided between the pulley and the casing to transmit the rotation of the drive motor by meshing with the pulley when the drive motor rotates in the forward direction, and disengaging from the pulley when the drive motor rotates in the reverse direction. A spiral spring is provided to urge the pulley in the direction of rotation in which the string is wound up, and a spiral spring is connected to the rotating shaft via a one-way joint to apply force when the pulley rotates in the direction in which the string is pulled out. The structure is equipped with a shock absorber that slows down the speed, so the smoke exhaust port can be closed simply by activating the drive motor, making remote control possible, and since the motor and pulley are normally separated, The drive motor does not interfere with the operation of the smoke outlet when the smoke outlet opens. Since the string with one end connected to the blade is attached to the spiral spring that urges the pulley in the direction in which it is wound around the pulley, it can be returned manually without any problem without using the drive motor. In addition, the shock absorber installed via the one-way joint operates to reduce the rotational speed only when the smoke exhaust port opens, so there is no need to place an unnecessary load on the drive motor or human power when returning. It has excellent effects such as:

[Brief explanation of drawings]

Fig. 1 is a front sectional view of one embodiment of the present invention, Fig. 2 is a front view of the clutch, and Fig. 3 is the same as Fig. 2.
III-III arrow view, Figure 4 is a sectional view of the smoke exhaust port, Figure 5
The figure is a schematic diagram of a smoke exhaust duct. 1...Blade, 2...Duct, 6...String, 7...
...Pulley, 7a... Rotating shaft, 9... Drive motor,
11...Clutch, 12...Spiral spring, 13...Casing, 14...Buffer device, 1
5...One-way joint, A...Automatic return device, B...
...Lock mechanism, S...Elastic member.

Claims (1)

[Scope of utility model registration request] A smoke exhaust port that is equipped with a blade that opens and closes the inside of the duct, an elastic member that biases the blade in the opening direction, and a lock mechanism that restricts the operation of the elastic member, and that returns the blade to the closed state. The automatic opening return device includes a pulley around which the other end of a string connected to the blade is wound and rotates in a direction in which the string is wound to rotate the blade in a closing direction. , a drive motor that rotates the pulley;
A clutch is provided between the drive motor and the pulley and engages with the pulley as the drive motor rotates in the forward direction to transmit the rotation of the drive motor and disengages with the pulley as the drive motor rotates in the reverse direction. A spiral spring is stretched between the casing and biases the pulley in the direction of rotation in which the string is wound, and a pulley connected to the rotating shaft via a one-sided joint pulls out the string. An automatic return device for a smoke exhaust port, characterized in that it is equipped with a buffer device that slows down the rotational speed when rotating in a direction.