JPH0512674Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a damper device that is connected to a duct and can be used for various purposes such as a fire damper, a volume damper, and the like.

[Prior Art] Conventionally, as this type of damper device, one shown in FIG. 5 is known.

In FIG. 5, reference numeral 1 is a duct, and 2 is a casing of a damper device connected in the middle of the duct 1. In FIG. The casing 2 has an inner surface having the same dimensions as the inner surface of the duct 1.
A shaft 3 is rotatably provided in the center of the casing 2, and a blade 4 is attached to the shaft 3. The blades 4 open and close the inside of the casing 2 by rotating around the shaft 3. Further, 5 indicates the same blade 4 when the blade 4 is in the closed state.
This is the stoppage.

[Problems to be solved by the invention] By the way, in the above conventional damper device,
Since the shaft 3 and the blades 4 are provided in the center of the casing 2, there is a drawback that even in the fully open state, the shaft 3 and the blades 4 obstruct the flow, resulting in a large pressure loss. Therefore, there was a problem in that a large amount of power was required for blowing air.

[Means for Solving the Problems] The present invention has been made to solve the above problems, and includes a first recess and a second recess that are outwardly recessed and face each other with respect to the inner surface of the duct. a first shaft rotatably provided at an upstream end of the first recess with respect to the fluid flowing inside the casing; A second rotatably provided at the end of the side.
The proximal end portions are fixed to the first and second shafts, respectively, and the respective tip portions are rotated by forward and reverse rotation of the first and second shafts in the same direction, and the respective distal ends are moved toward and away from each other. A first vane and a second vane that open and close the inside of the casing by opening and closing the inside of the casing, and are connected to the ends of the first and second shafts protruding from the casing to move the first and second shafts in the same direction. and a rotational force transmitting member that rotates in synchronization with the duct, and the first and second blades accommodate the first and second recesses, respectively, when the casing is in the open state, and the first and second blades are arranged at least outwardly from the inner surface of the duct. It is characterized by its location.

[Operation] When the first and second blades are in the open state, the first and second shafts and the first and second blades are accommodated in the first and second recesses of the casing, respectively, and the duct It does not protrude inward against the inner surface. Therefore, the first and second shafts and the first and second blades do not obstruct the fluid flowing within the duct.

Further, when the first and second blades are in a closed state or a somewhat closed state, the fluid flowing inside the casing acts on the first blade in the direction of opening it, and the second blade is forced to open. A force acts in the direction that it closes. Therefore, the fluid acts on the first and second shafts through the first and second blades to cause them to rotate in opposite directions.

Since these first and second shafts are connected to rotate synchronously in the same direction by the rotational force transmission member, the forces (torque) that try to rotate these shafts in opposite directions cancel each other out. Ru. Therefore, since no torque is generated on the first and second shafts by the fluid, the first and second blades can be opened and closed with extremely small force.

[Embodiment] Hereinafter, an embodiment of the present invention will be described with reference to FIGS. 1 to 4.

In FIG. 1, reference numeral 11 is a duct, and 12 is a casing of a damper device. The duct 11 is formed into a rectangular tube shape with a rectangular cross section, and a flange 11a for connecting the casing 12 is formed at the open end thereof. Casing 1
2 is provided to be sandwiched between the ducts 11, 11, and the flange 1 of the duct 11 is provided at the inlet portion 12a and the outlet portion 12b, respectively.
Flanges 12c, 12c for connection to 1a are formed. Also, casing 1
The inner circumferential surfaces of the inlet port 12a and the outlet port 12b of 2 are formed to have the same dimensions as the inner circumferential surface of the duct 11, and the upper and lower portions between the inlet port 12a and the outlet port 12b are respectively Recesses (first recess, second recess) 12d, 12d are formed in. The lower concave portion 12d has an outlet portion 1.
A shaft (second shaft) 13 is provided near the inlet 2b, and a shaft (first shaft) 13 is provided in the upper recess 12d near the inlet 12a.

These shafts 13, 13 are respectively connected to the recess 12.
It is rotatably provided through the left and right (direction perpendicular to the plane of paper in FIG. 1) side surfaces of d and 12d. Blades 14, 14 are fixed to these shafts 13, 13, respectively.

As shown in FIG. 2, the blade 14 has a recess 12d.
A rectangular main plane part 1 that fits with some play.
4a, and a strip-shaped side surface portion 14b formed perpendicularly to the main plane portion 14a at the periphery of the main plane portion 14a, with the side surface portion 14b on the base end side being axially It is fixed at 13. This blade 14 is arranged so that when the main plane part 14a is made horizontal, the main plane part 14a is flush with the lower surface or the upper surface of the inlet part 12a and the outlet part 12b, and the side part 14b is arranged in the recessed part 12d. It is attached to the shaft 13 so as to fit into the shaft. Also, code 15
is a stopper for holding the blade 14 horizontally, and 16 is a buffer member for mitigating the impact when the blade 14 hits the stopper 15. In addition, the lower blade 14 includes upper and lower blades 14, 14.
A band-shaped buffer member 17 is attached to the portion where the two contact each other. This buffer member 17 is used to reduce the impact when the upper and lower blades 14, 14 hit each other, and to prevent the gas flowing inside the duct 11 from leaking from the inlet port 12a side to the outlet port 12b side. be. Furthermore, a member 12f shaped in cross section and a band-shaped sealing member 18 placed on the member 12f are provided on the bottom surface 12e of the recess 12d. This seal member 18 is attached to the side surface 14 on the proximal end side of the blade 14 when the blade 14 is in the closed state.
This is to prevent gas leakage by being locked to a locking piece 14c formed at b.

On the other hand, the shafts 13, 1 arranged in the upper and lower recesses 12d
A rotational force transmitting member A is connected to 3 as shown in FIG. The rotational force transmitting member A will be described below. The base ends of short links 20, 20 are fixed to the shafts 13, 13, respectively, at portions protruding from one side surface in the left and right direction of the recess 12d. , 20, a long link 22 is rotatably connected via pins 21, 21, respectively. Further, a lever 23 is attached to the upper shaft 13.

Further, FIG. 4 shows the inlet portion 1 of the casing 12.
2a is a view of the inside of the casing 12 as seen from the arrow, and shows that the blades 14 and shaft 13 do not protrude inside the casing 12 when the blades 14 are in the open state. Further, in this figure and FIG. 1, reference numeral 24 is a stopper for preventing overrun when the blade 14 is rotated in the opening direction.

In the damper device configured in this way, when the lever 23 is rotated, the upper shaft 13, the upper short link 20, the long link 22, and the lower short link 2 are rotated.
The rotational force is transmitted in the order of 0 and the lower shaft 13, and the upper and lower blades 14, 14 simultaneously rotate in the same direction.
For example, when the lever 23 is rotated in the opening direction, the upper blade 14 rotates upward and the lower blade 14 rotates downward. And the upper and lower blades 14, 14
are accommodated in the upper and lower recesses 12d, 12d, respectively. At this time, the main plane part 14a of the blade 14 is connected to the inlet part 12a and the outlet part 1 of the casing 12.
It will be flush with the inner surface of 2b. Further, when the lever 23 is rotated in the closing direction, the upper blade 14 rotates downward, the lower blade 14 rotates upward, and the tips of the upper and lower blades 14, 14 come into contact.
At this time, a force acts on the upper and lower blades 14, 14 to rotate them downward due to gravity, but
These forces are forces that rotate the upper and lower axes 13, 13 in opposite directions, so the upper and lower axes 13, 1
Short links 20, 20 and long links 2 connected to 3
2 and are in a state where they cancel each other out. In addition, the upper and lower blades 14, 14 are
Each receives force from the gas flowing inside the casing 12, but these forces are also applied to the upper and lower shafts 13, 13.
These forces try to rotate the two in opposite directions, so they are balanced and cancel each other out, just like gravity. However, the lower blade 14 receives a greater force from the gas flow than the upper blade 14 because the gas is applied to the portion surrounded by the side surface portion 14b. For this reason, the blade 14,1
4 is subjected to a force in the closing direction in a normal state.

According to the damper device configured as above,
When the blades 14, 14 are in the open state, the upper and lower shafts 1
3, 13 and the upper and lower blades 14, 14 are accommodated in the upper and lower recesses 12d, 12d, respectively, and the blade 1
4 is flush with the inner surfaces of the inlet portion 12a and the outlet portion 12b of the casing 12, so the pressure loss of the gas passing through the casing 12 is extremely small. Therefore, the blower capacity can be reduced.

Further, since the force acting on the blade 14 such as gravity is offset by the short link 20 and the long link 22, the blade 14 can be opened or closed with a small operating force.

In addition, a buffer member 17 is provided at the tip of the lower blade 14.
are provided, and the bottom part 12 of the upper and lower recesses 12d, 12d
The locking piece 1 on the base end side of the upper and lower blades 14, 14 is shown in e.
Since the sealing member 18 that is engaged with the blade 4c is provided, the airtightness is good when the blade 14 is in the closed state.

In the above embodiment, the shaft 13 is configured to be rotated manually by the lever 23, but the shaft 13 may be rotated by an electric motor or the like.

[Effect of the invention] As explained above, according to the invention, when the first and second blades are in the open state, the first and second shafts and the first and second blades are respectively connected to the casing. It is accommodated within the first and second recesses and does not protrude inwardly with respect to the inner surface of the duct. Therefore, the first and second shafts and the first and second blades do not obstruct the fluid flowing within the casing, and pressure loss becomes extremely small. Therefore, for example, when air is used as the fluid, the amount of energy consumed for blowing can be kept to a minimum. Furthermore, it is also possible to use a smaller blower than before.

Furthermore, due to the fluid flowing inside the casing, a force is exerted on the first and second shafts through the first and second blades to cause them to rotate in opposite directions. Forces (torques) that try to rotate in opposite directions cancel each other out by the rotational force transmission member.

Therefore, since no torque is generated on the first and second rotating shafts by the fluid, the opening and closing operations of the first and second blades can be performed with extremely small force.

[Brief explanation of the drawing]

1 to 4 are views showing one embodiment of the present invention, in which FIG. 1 is a side sectional view of a damper device, FIG. 2 is a side sectional view of the main part of the damper device, and FIG. FIG. 4 is a side view of the damper device, FIG. 4 is a view taken along arrow P in FIG. 3, and FIG. 5 is a side sectional view of the damper device shown as a conventional example. 11...Duct, 12...Casing, 12d
... recess (first recess, second recess), 13...
shafts (first shaft, second shaft), 14... blades (first
blade, second blade), A... Rotational force transmission member.

Claims (1)

[Claims for Utility Model Registration] In a damper device connected to a duct to open and close the duct, a casing in which a first recess and a second recess are formed facing each other and are recessed outwardly from the inner surface of the duct. a first shaft rotatably provided at an upstream end of the first recess with respect to the fluid flowing inside the casing; and a first shaft rotatably provided at an end of the second recess on the downstream side of the fluid. A rotatably provided second shaft, the base end portions of which are fixed to the first and second shafts respectively, and are rotated by forward and reverse rotation of the first and second shafts in the same direction. a first blade and a second blade that open and close the inside of the casing by bringing their respective tips into contact and separation; and a first blade connected to the ends of the first and second shafts protruding from the casing. and a rotational force transmitting member that rotates the second shaft synchronously in the same direction, and the first and second blades are accommodated in the first and second recesses, respectively, when the casing is in an open state. A damper device characterized in that the damper device is located at least outside the inner surface of the duct.