JPH0737629Y2 - Damper device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a damper device provided in a duct connecting a dust collector and a dust source.

(Prior Art) Generally, a duct connecting a dust collector and a dust source has a blocking damper that shuts off the duct by a cylinder in an emergency, and a blast wind that flows backward toward the dust source in the duct when an explosion occurs in the dust collector. And a check valve for shutting off.

(Problems to be solved by the invention) However, if two types of shut-off damper and check valve are to be provided in the duct, the structure becomes complicated and the manufacturing cost increases, and moreover, the time from blast detection to operation is high. However, there was a problem that the mounting area also increased.

(Means for Solving the Problems) The present invention relates to a damper device that solves the above-mentioned problems, and includes an upper end of a damper that opens and closes an opening on the inlet side in a case body having an inlet and an outlet. A stopper is provided to restrict the opening of the damper to a position of a half open state on the downstream side so as to pivotally support the damper and to operate in a closing direction when the damper receives a blast. An arm with a weight that urges the damper in the opening direction and an arm that faces the trajectory of the piston rod of the cylinder that closes the damper are attached to the shaft end.

(Operation) If such a damper device is installed between the ducts connecting the dust collector and the dust source, as in the conventional damper device of this type, the damper will normally reach the position where it comes into contact with the stopper by the arm with the weight. Since it is opened and the opening is open, the dust-containing gas from the dust source is sucked into the dust collector through the inflow port and outflow port and is filtered, so that only clean air is released into the atmosphere. When an explosion occurs in the dust collector, the damper, which is opened to the vicinity of the center of the case main body by the stopper on the downstream side, resists the urging force of the weight when it receives the blast flowing back from the outlet. If the blast blows back to the dust source and does not cause trouble because it moves to block the opening, and if you want to block the damper and stop it in an emergency due to operational problems, then use the cylinder. Pis if you activate The arm of the damper shaft facing the forward / backward movement path of the ton rod is pushed against the biasing force of the weight by the piston rod to pivot the damper and close the opening.

(Example) Next, this invention is demonstrated in detail based on the Example shown in figure.

Reference numeral (1) is a case body having an inflow port (2) and an outflow port (3), and a damper (5) for opening and closing an opening (4) on the inflow port (2) side in the case body (1). Is pivotally supported by its upper end. (6) is a stopper that regulates the opening of a damper (5) provided on the downstream side of the case body (1), and the stopper (6) causes the damper (5) to be in a half-opened state toward the downstream side. Is being pivoted up to. Reference numeral (7) is a damper shaft for pivotally mounting the damper (5), and an arm (9) with a weight (8) is provided at the shaft end of the damper shaft (7) protruding outside the case body (1). Since the arm (9) attached to the weight (8) is always displaced from the vertical line, the damper (5) is always urged in the opening and pivoting direction.
(10) is an arm fixed to one end of the damper shaft (7), and the arm (10) is a trajectory of a piston rod (12) of a cylinder (11) attached to a side wall of the case body (1). When the cylinder (11) is activated, the contact surface (12a) of the piston rod (12) advances and pushes the receiving surface (10a) of the arm (10) to pivot the arm (10). The damper (5) is pivoted against the force of the weight (8) to close the opening (4). In addition, in the figure (1
3) is a limit switch that stops the operation of the cylinder (11). With such a configuration, if this device is connected to the duct connecting the dust collector and the dust source to drive the dust collector, the exhaust gas from the dust source is sucked into the dust collector through the inlet and outlet. Although only filtered clean air is released to the atmosphere, when an explosion occurs in the dust collector,
Even if the blast flows back toward the dust source,
The case body (1) connected to the duct has a damper (5) pivoted on the downstream side in a half-open state,
The damper (5) receives the blast flowing in from the outlet (3) and closes the opening (4) against the force of the weight (8) to prevent the blast from flowing back to the dust source. When the damper is cut off during operation to perform an emergency stop, the cylinder (11) is operated to move the piston rod (12) forward, so that the damper that faces the trajectory of the piston rod (12) moves forward and backward. The arm (10) attached to the shaft end of the shaft (7) is pressed by the piston rod (12) to pivot, and the damper (5) closes the opening (4). When the piston rod (12) is retracted when dust collection is restarted, the damper (5) is automatically pivoted by the weight (8) to open the opening (4).

(Effect of the Invention) As is apparent from the above description, the present invention allows the damper to be pivoted on the downstream side, and has a weight at the shaft end of the damper shaft and an arm for urging the damper in the opening direction at all times. Even when a sudden explosion accident occurs inside the dust collector or when the dust collector is artificially stopped in an emergency by installing an arm that faces the trajectory of the piston rod of the cylinder that closes the damper, the conventional method is used. A single damper can be used for shutting off without using two sets of shut-off damper and check valve. It has various advantages such as a simple structure, inexpensive manufacturing, and a large reduction in mounting area. In addition, it is of great practical value.

[Brief description of drawings]

FIG. 1 is a partially cutaway side view showing an embodiment of the present invention, FIG. 2 is a plan view of the same, and FIG. 3 is a partially cutaway side view of the same state. (1): case body, (2): inflow port, (3): outflow port, (4): opening, (5): damper, (6): stopper, (7): (8): weight, ( 9): arm, (10): arm, (11): cylinder, (12): piston rod.

Claims (1)

[Scope of utility model registration request] 1. An upper end of a damper (5) for opening and closing an opening (4) on the inlet (2) side is pivotally supported in a case body (1) having an inlet (2) and an outlet (3). At the same time, a stopper (6) for restricting the opening degree of the damper (5) to a half-opened position on the downstream side is provided so that the damper (5) operates in the closing direction when it receives a blast, and the case body (1) ) An arm (9) with a weight (8) for urging the damper (5) in an opening direction, and a cylinder (for closing the damper (5) at the shaft end of the damper (5) protruding outward. A damper device, characterized in that the arm (10) facing the advance / retreat trajectory of the piston rod (12) of (11) is attached.