JPS6243229Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an airtight damper used to block air flowing in a duct.

In the air conditioning equipment of a building, in order to supply, return, and exhaust air, the air outlet or inlet installed in each room is connected to an air conditioner, blower, etc. through a main duct system, annular duct system, etc. When disinfecting, etc. is performed in one room, it is necessary to ensure that other rooms that do not require disinfection, etc. are not affected through the duct. Rooms that need to be disinfected include rooms that require sterilization, such as animal experiment facilities, hospitals, and pharmaceutical factories, and disinfection of these rooms is performed regularly. When disinfecting, completely seal the gaps around entrance and exit doors to prevent the sterilizing agent from leaking outside. At this time, make sure that the ducts leading to other systems and these It is necessary to completely isolate the room from the However, in normal conditions other than during disinfection, it is desirable not to impede the air circulation within the duct.

As a conventional airtight damper, Utility Model 52-39357
There is something disclosed in the publication No. This is achieved by mounting the damper shaft in the radial direction on the damper body, and extending the shielding plate (vane) provided on the damper shaft in the axial direction of the damper body to obtain an open state.The damper shaft can then be rotated 90 degrees. In the closed state, the periphery of the shielding plate contacts the stopper ring provided on the damper body, and the elastic plate provided on the shielding plate elastically contacts the stopper ring, resulting in a sealed state. is obtained. However, in such conventional airtight dampers, the shielding plate is always present inside the damper body, so when the damper is opened, the shielding plate flaps and generates noise.
In addition, it is easy to cause air drift and disturb the smooth flow of air, and the shielding plate and stopper ring have to have a complicated structure in order to obtain a sealed state.

As another conventional airtight damper,
One such example is disclosed in Japanese Patent Publication No. 23915.
A protruding recess is formed in the damper body, and one end of the shielding plate is fixed to the damper shaft that is journalled in this protruding recess. However, in such conventional airtight dampers, since the shielding plate is housed in the protruding recess when the damper is open, this structure is less likely to cause air drift, but on the other hand, the presence of the protruding recess requires a large housing space for the damper body, and in addition, since one end of the shielding plate is fixed to the damper shaft, complete sealing cannot be achieved if there is an installation error, warping, distortion, etc. in the shielding plate.

The present invention was devised to eliminate such problems, and provides an airtight damper with a simpler structure and superior air blocking performance compared to conventionally proposed airtight dampers. .

The present invention will be explained below with reference to the illustrated embodiments.

In the figure, reference numeral 1 denotes a damper body with a rectangular cross section whose openings on both sides are connected to the duct, and an opening 2a is provided in one side wall 2, and a hinge 3
A door 4 that is attached at points a and 3b and can be opened and closed is attached. A gasket 5 made of neoprene sponge, for example, is fixed to the inner circumferential surface of the door 4 so that it elastically adheres to the periphery of the opening 2a when the door 4 is closed, and a gasket 5 made of, for example, neoprene sponge is fixed to the inner peripheral surface of the door 4, and a shielding plate 16 (to be described later) is attached on one side approximately in the center. A second gasket 18 is fixedly attached to the edge portion to elastically adhere to the edge. An upper pedestal 8a and a lower pedestal 8b are fixed to the inner surfaces of the upper and lower side walls of the opening 2a portion of the damper body 1, with their heights matching the upper and lower edges of the opening 2a, respectively. Reference numeral 6 denotes a locking edge, which is formed in a U-shape on the inner circumference of the damper body 1 excluding the opening 2a side. Specifically, its upper side 6a is connected to the upper pedestal 8a, and its lower side 6b
is fixed to the lower pedestal 8b. 7a and 7b are guide pieces that guide the shielding plate 16, and each pedestal 8a and 8
It is fixed on the same side as the locking edge 6 of b, preferably on the upstream side of the air flow, at a predetermined distance from the upper side 6a and lower side 6b of the locking edge.

Further, a shaft rod 9 that crosses the mounting side of the guide pieces 7a and 7b is rotatably mounted on the damper body 1, and a disk is eccentrically inserted into the center of the shaft rod 9, and a set screw 10 is screwed. An eccentric cam 11 is provided which is tightened and fixed, and the end of the shaft rod 9 on the opening 2a side is connected to the damper body 1 via an airtight bearing 12.
A closing handle 13 for rotating the eccentric cam 11 by penetrating one side 2 is attached to the eccentric cam 11.
Install with the phase shifted by 90°. Reference numeral 14 denotes a pressing member which is fixed at a position where the diameter of the eccentric cam 11 is maximum around the shaft rod 9, and can be moved back and forth by inserting bolts 15a and 15b into the long holes 14a of the eccentric cam 11 and tightening them. The working length of the eccentric cam 11 can be adjusted. Here, the eccentric cam 11 can gradually increase the action length by giving the outer edge of the flat plate a circular or a suitable contour curve other than circular, and can apply a gradually increasing pressing force to the center of the shielding plate 16, which will be described later. In addition, as in this embodiment, there is a pressing member 14 at the location of the maximum action length.
By providing this and adjusting its working length, it is possible to maintain good contact with the first packing 17, which will be described later, and to obtain a good airtight condition each time it is used. Note that a plurality of eccentric cams 11 can be arranged in parallel in the axial direction of the shaft rod 9.

Reference numeral 16 denotes a shielding plate, which is formed into a rectangular plate shape that can come into contact with the locking edge 6 provided around the damper body 1, as shown in FIG. A first packing 17 made of sponge or the like is fixed. A handle 16a is formed by bending one side edge of the shielding plate 16, and when the door 4 is closed, it comes into close contact with the second gasket 18 fixed to the door 4 to maintain airtightness.

To assemble the airtight damper made up of the above parts, open the door 4, hold the shielding plate 16 with the handle 16a on the front side, and place the first gasket 17 on the locking edge 6 side, using the guide pieces 7a and 7b. It is inserted into the damper main body 1 while being guided, and the closing handle 13 is rotated to press the shielding plate 16 with the pressing member 14 of the eccentric cam, so that the first gasket 17 is elastically brought into close contact with the locking edge 6. Maintaining airtightness, close door 4 and seal 5.
to the periphery of the opening 2a, and the second gasket 18 to the handle 16a, which is one edge of the shielding plate 16, to create an airtight state, and rotate the handle 19 to attach the locking piece 19a to the shaft rod 9. Ring member 2 attached
This is done by locking it at 0. As a result, air flowing in the direction of the arrow inside the damper is effectively blocked, and sterilized air in one room is prevented from flowing into other rooms through the duct.

Note that this invention works similarly even if the first packing 17 is fixed to the locking edge 6 side, the packing 5 to the opening 2a side, and the second packing 18 to the handle 16a side of the shielding plate 16. Furthermore, the invention is the same even if a packing material is fixed to the entire inner surface of the door 4 and this packing material has the function of keeping the packing 5 and the second packing 18 airtight.

In this way, the airtight damper according to the present invention has the shielding plate 16 inserted into the damper body 1 and the eccentric cam 1
A fully closed state can be obtained easily and reliably by rotating the shield plate 16, and a fully open state can be obtained by removing the shielding plate 16, making it suitable for use in locations that are not frequently opened and closed.

As explained above, the present invention includes a damper body having an opening in one side wall, a door that can maintain and close the opening airtightly, and a gate provided around the inner circumference of the damper body at the opening location except for the opening side. a retaining edge, a shaft rod that is rotatably mounted across the damper body, fixes the eccentric cam, has one end kept airtight, protrudes outside the damper body, and is provided with a closing handle;
It consists of a shielding plate that can be inserted through the opening and abut against the locking edge, a first packing that is fixed to the locking edge or the shielding plate, and a second packing that is fixed to one side edge of the shielding plate or the door. , the shielding plate is pressed by an eccentric cam to bring the shielding plate and the locking edge into close contact with each other via a first gasket, and the shielding plate and the door are brought into close contact with each other through a second gasket by closing the door. It has an airtight damper that maintains airtightness.

Therefore, the following actions and effects can be obtained.

By using a damper main body and a shielding plate that have a simple and compact structure, a closed state that maintains a high degree of airtightness can be obtained, and this airtightness is not easily affected by fluctuations in air pressure.

Since the open state can be obtained by removing the shielding plate from the damper body, noise and drift caused by the shielding plate are not generated in the open state, and a quiet and smooth air flow can be obtained.

The closed state is achieved by manually operating the handle and rotating the shaft, so it is not suitable for emergency shutoffs such as automatic closing, but it requires periodic shutoffs such as during disinfection, and it is not suitable for automatic shutoffs. Suitable for locations with sufficient capacity and infrequent closure. Furthermore, by opening the door, it is possible to visually check whether the shielding plate is closed or not.

The closed state is achieved by applying a gradually increasing pressing force to the center of the shielding plate using an eccentric cam, so the structure is relatively simple and has excellent durability, and the peripheral edge of the shielding plate is closed through the first packing. The shielding plate is in close contact with the locking edge, and one edge of the shielding plate is in close contact with the door via the second gasket, maintaining a high degree of airtightness. Further, the eccentric cam always applies a good pressing force to the shielding plate depending on the state of the first packing.

[Brief explanation of the drawing]

1 to 5 show an embodiment of the airtight damper according to the present invention, FIG. 1 is a perspective view of the airtight damper with the shielding plate removed, FIG. 2 is a perspective view of the airtight damper in the closed state,
FIG. 3 is a sectional view showing an example of the relationship between the eccentric cam and the shielding plate in the closed state, FIG. 4 is a perspective view of the shielding plate, and FIG. 5 is a sectional view taken along the line A-A in FIG. 3. . 1: damper body, 2: one side wall, 2a: opening,
3a, 3b: Hinge, 4: Door, 5, 17, 18:
Packing, 6: Locking edge, 9: Shaft rod, 11: Eccentric cam, 12: Airtight bearing, 13: Closing handle, 1
6: Shielding plate, 16a: Handle.

Claims (1)

[Scope of utility model registration request] A damper body having an opening in one side wall, a door capable of airtightly holding and closing the opening, a locking edge provided around the inner circumference of the damper body at the opening location except for the opening side, and a locking edge that traverses the damper body. A shaft rod is rotatably mounted on a shaft, fixing the eccentric cam, and having one end kept airtight and protruding outside the damper body and provided with a closing handle, and a locking edge inserted through the opening. a shielding plate that can come into contact with the shielding plate, a first packing that is fixed to the locking edge or the shielding plate, and a second packing that is fixed to one side edge of the blocking plate or the door,
The shielding plate is pressed by an eccentric cam to bring the shielding plate and the locking edge into close contact with each other through the first gasket, and when the door is closed, the shielding plate and the door are brought into close contact through the second gasket to form an airtight seal. An airtight damper characterized by holding.