JPH0437611Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a discharge device for a dust collector having a double damper.

(Prior Art) In a bag filter type dust collector, dust floating in air or gas is captured by a bag filter, and only clean air is discharged to the outside.

The dust collector, which has a negative pressure inside, is equipped with a double damper, as shown in FIG. 3, in order to discharge collected dust.

The suction duct 1 is connected to a dust collector main body (hopper) 3 on the downstream side of the bag filter 2. bug filter 2
An exhaust duct 5 is connected to the upstream side of the dust collector, and air is sucked from inside the dust collector using a roots blower (not shown) or the like.

A screw conveyor 4 is installed at the bottom of the dust collector body 3.
is provided, and a discharge port 6 is formed at the end of the screw conveyor 4 for discharging the powder particles sent by the screw conveyor 4.

The discharge port 6 is provided with double upper and lower dampers 7 and 8.

Most of the powder sucked into the dust collector main body 3 from the suction duct 1 as the blower operates falls downward as the flow velocity decreases due to the rapid expansion of the passage cross-sectional area.

Powder particles floating in the air are trapped when passing through the bag filter 2, and only clean air is discharged to the outside via the blower.

The accumulated powder in the dust collector main body 3 is collected at a discharge port 6 by a screw conveyor 4. By opening the upper damper 7, the powder falls into the chamber 9 between it and the lower damper 8. After closing the upper damper 7, the lower damper 8 is opened to take out the powder to the outside.

(Problem to be solved by the invention) By the way, the chamber 9 between the upper and lower dampers 7 and 8
Since the inside of the dust collector body 3 is under negative pressure, a large driving force is required to open the lower damper 8 when taking out the powder dropped into the chamber 9 to the outside. There was a problem in that the powder inside the chamber 9 would fly up due to the sudden pressure change when the chamber 9 was opened.

The present invention aims to solve such problems.

(Means for solving the problem) The present invention is equipped with a filter inside the dust collector body,
This dust collector has a suction duct connected to the upstream side of the filter, a blower connected to the downstream side via an exhaust duct, and a discharge port provided at the bottom of the dust collector main body, with upper and lower dampers arranged in duplicate at this discharge port. In this example, a negative pressure breaker valve was provided at the gate of the lower damper, and the drive arm for opening and closing the gate was linked to open the negative pressure breaker valve at the initial stage of arm lift.

(Function) As the blower operates, the inside of the dust collector body becomes negative pressure,
Powder is sucked through the suction duct, and only air purified by the filter is discharged to the outside.

In order to discharge the powder accumulated inside the dust collector body, the upper damper is opened and the powder falls onto the upper surface of the lower damper. Next, open the lower damper,
In this case, as the drive arm operates, the negative pressure release valve first opens to bring the pressure between the double dampers closer to atmospheric pressure. For this reason, there is almost no difference in pressure between the top and bottom of the lower damper, and the lower damper can be easily opened with a small driving force.

(Example) Examples of the present invention are shown below in Figures 1A to C and 2.
This will be explained based on the diagram.

As shown in the figure, the gate 10 constituting the lower damper 8 is rotated to open and close about a support pin 12 via a drive arm 11. The drive arm 11 is connected to an actuator 21 such as a hydraulic cylinder.

A vent hole 13 is formed in the center of the gate 10, and a negative pressure breaker valve 14 for opening and closing the vent hole 13 is provided.

As shown in FIG. 2, the drive arm 11 is formed of branch arms 11A and 11B that are parallel to each other, and a support shaft 15 connecting the tips thereof is formed on a pair of brackets 16 protruding from the lower surface of the gate 10. It is inserted into the elongated hole 17. and support shaft 15
A negative pressure breaker valve 14 is attached to the center of the valve. The negative pressure breaker valve 14 has a gasket 19 attached to a plate 18 fixed to a support shaft 15, and the gasket 19 opens and closes the vent 13.

Note that when the lower damper 8 is closed, the gate 10 comes into pressure contact with a packing 20 provided around the chamber 9 to maintain the airtightness of the chamber 9.

The other parts are constructed in the same manner as in FIG. 3, and illustration thereof is omitted.

Next, the effect will be explained.

The powder sucked from the suction duct 1 by the operation of the blower falls downward as the flow velocity decreases inside the dust collector main body 3, and the purified air flows through the bag filter 2 to the exhaust duct 5.

Powder accumulated inside the dust collector main body 3 is collected at a discharge port 6 by a screw conveyor 4. By opening the upper damper 7, the powder is transferred to the lower damper 8.
It falls into chamber 9 between. After closing the upper damper 7, the lower damper 8 is opened to take out the powder to the outside, but since the inside of the chamber 9 is under negative pressure like the inside of the dust collector body 3, the lower damper 8 is at atmospheric pressure. It takes a large amount of driving force to be pushed and opened.

However, when the drive arm 11 is actuated by the actuator 21, the support shaft 15 first moves along the elongated hole 17 and the negative pressure breaker valve 14 vents at the beginning of the lift of the drive arm 11, as shown in FIG. 1B. Open your mouth 13.

Therefore, the atmosphere is introduced into the chamber 9, and the pressure inside the chamber 9 becomes almost the same as the outside atmospheric pressure, thereby canceling the suction force of the gate 10.

As shown in FIG. 1C, after the negative pressure release valve 14 opens, the gate 10 rotates and opens to a predetermined opening degree, but since the internal negative pressure is canceled, this rotation is smooth. It is done.

Further, since the inside of the chamber 9 is brought close to atmospheric pressure in advance, there is no sudden pressure change due to the opening of the lower damper 8, and the powder can be smoothly discharged without flying up.

The above operations are repeated in sequence, thereby allowing the powder to be continuously discharged to the outside.

Although this embodiment describes an example in which the application is applied to a powder dust collector with a bag filter, it is obvious that the application is not limited to this. Applicable to equipment that uses

(Effects of the invention) As described above, according to the invention, when opening the lower damper, the negative pressure release valve opens first as the drive arm operates, bringing the chamber pressure between the double dampers closer to atmospheric pressure. The pressure difference between the top and bottom of the lower damper is almost eliminated, the lower damper can be opened easily with a small driving force, and the powder inside is also smoothly discharged because there is no sudden pressure fluctuation.

[Brief explanation of drawings]

1A, B, and C are sectional views of essential parts of an embodiment of the present invention in an operating state, FIG. 2 is a vertical sectional view of a negative pressure breaker valve, and FIG. 3 is a sectional view of a conventional example. 1... Suction duct, 2... Bag filter, 3...
...Dust collector body, 5...Exhaust duct, 6...Exhaust port, 7...Lower damper, 8...Upper damper, 10
... Gate, 11 ... Drive arm, 13 ... Vent, 14 ... Negative pressure release valve, 15 ... Support shaft, 17
...Long hole.

Claims (1)

[Scope of utility model registration request] A filter is provided inside the dust collector body, and a suction duct is connected to the upstream side of the filter, and a blower is connected to the downstream side via an exhaust duct. In a dust collector with a double lower damper arrangement, a negative pressure breaker valve is provided at the gate of the lower damper, and the drive arm that opens and closes the gate is linked to open the negative pressure breaker valve at the initial stage of arm lift. A dust collector discharge device featuring: