JPH0143138Y2 - - Google Patents

Description

[Detailed explanation of the idea] (Industrial application field) The present invention relates to an improvement of a dust collection device.

The dust collection device includes a conveyance duct connected to a dust collector equipped with a suction blower, a suction duct connected to the conveyance duct and facing each of the plurality of dust generating equipment, and a suction duct provided in each suction duct and connected to each suction duct. A valve mechanism that opens and closes, and a drive state of each of the dust generating equipment is detected, and as the number of stopped dust generating equipment increases, the rotation speed of the suction blower is lowered, and a suction is applied to the stopped dust generating equipment. Some devices are equipped with a control mechanism that closes a valve mechanism provided in the duct. With this configuration, the suction blowers can be effectively controlled according to the number of dust generating equipment in operation.
It is possible to save energy.

(Problems to be solved by the invention) However, in the case of the above dust collection device,
Since the inner diameter of the conveyance duct is larger than the inner diameter of the suction duct, if the rotation speed of the suction blower is reduced in response to blockage in a given suction duct, the conveyance duct will This resulted in a decrease in the suction flow rate within the conveyor duct, and there was a risk that dust would accumulate within the conveyor duct, causing the conveyor duct to become clogged.

The present invention was developed in view of the above circumstances, and its purpose is to prevent clogging in the conveyance duct.

(Means for Solving the Problems) In order to achieve this object, the present invention includes a transport duct 3 connected to a dust collector 1 equipped with a suction blower 2, and a plurality of dust collectors connected to the transport duct 3. Suction ducts 11, 12, 13 facing the generation equipment 8, 9, 10, respectively, and each suction duct 1
Valve mechanisms 14 to 19 provided in each of the suction ducts 1, 12, and 13 to open and close each suction duct 11, 12, and 13;
Then, the driving state of each of the dust generating equipments 8, 9, 10 is detected, and as the number of stopped dust generating equipments 8, 9, 10 increases, the rotation speed of the suction blower 2 is lowered and the number of rotations of the suction blower 2 is decreased. A dust recovery device comprising: a control mechanism 21 for closing a valve mechanism provided in a suction duct facing the stopped dust generating equipment; An on-off valve 2 that communicates and shuts off the inside of the conveying duct 3 and the atmosphere at
The configuration is such that 0 is provided.

(Function) With the above-described configuration, the on-off valve 20 is changed in the opening direction, and the suction ducts 11, 12, 13 are in the open state.
If the suction flow rate within the suction duct is reduced to an extent that does not impede dust suction, the pressure loss in each suction duct will be reduced correspondingly to the reduction in the suction flow rate. As a result, the suction flow rate by the suction blower 2 increases, and a suction flow rate sufficient for transporting the dust can be ensured within the conveyance duct 3.

(Example) Examples of the present invention will be described below.

In FIG. 1, 1 is a dust collector, a suction blower 2 is connected to its discharge port, and a conveyance duct 3 is connected to the suction port of the dust collector 1. A plurality of filters 4 are provided inside the dust collector 1, and dust is collected by the filters 4, and the collected dust is collected in a pallet 5 below the dust collector 1.

The suction blower 2 is driven by the motor 6, and the suction blower 2 creates a negative pressure on the suction port side of the dust collector 1. A rotation speed control device 7 is connected to the motor 6, and the rotation speed of the motor 6 is controlled by an output signal from the rotation speed control device 7.

The conveyance duct 3 extends horizontally from the dust collector 1 toward above the plurality of dust generating facilities 8 , 9 , and 10 . This conveyance duct 3 includes a plurality of suction ducts 1 each having an inner diameter smaller than the inner diameter of the conveyance duct 3.
1, 12, 13 are connected, and each suction duct 11, 12, 13 is connected to each of the dust generating equipment 8, 9,
10 each. Each suction duct 11,
On-off valves 14, 15, 16 are provided in the on-off valves 12, 13, respectively.
16 is driven by cylinder mechanisms 17, 18, and 19.

An electric damper 20 as an on-off valve is connected to the end of the conveyance duct 3.
The atmosphere and the inside of the conveyance duct 3 are communicated with each other by opening and closing.

The rotation speed control device 7, the cylinder mechanism 17, 1
8, 19 and the electric damper 20 have a control mechanism 21.
is connected on its output side, and each dust generating equipment 8, 9, 10 is connected on the input side of the control mechanism 21.
drive source is connected. Thereby, the control mechanism 21 controls the rotation speed control device 7 and the cylinder mechanism 1 according to the operating state of each dust generating equipment 8, 9, 10.
7, 18, 19 and the electric damper 20.

Next, the operation of the dust collection device will be explained.

When the dust generating equipment 8, 9, 10 is being driven, the driving state signal of each dust generating equipment 8, 9, 10 is input to the control mechanism 21, and the control mechanism 21 Based on the status signal, the rotation speed control device 7, each cylinder mechanism 17, 18, 19
and output signals to the electric damper 20, respectively. Based on the output signal from the control mechanism 21, the rotation speed control device 7 outputs an output signal for fully rotating the motor 6 to the motor 6, and the motor 6 drives the suction blower 2 based on the full rotation. Each cylinder mechanism 17, 18, 19 opens the on-off valve 14, 15, 16 based on the output signal from the control mechanism 21, and the inside of each suction duct 11, 12, 13 and the dust collector 1 are opened.
communicate with. For this reason, each dust generating equipment 8,
The dust generated from 9 and 10 is removed from each suction duct 1.
1, 12, 13, dust collector 1 via conveyance duct 3
be guided by The electric damper 20 has a control mechanism 21
Based on the output signal from the conveyor duct 3, the valve inside the conveyor duct 3 is kept closed to the atmosphere.

Dust generating equipment 8 stops, and dust generating equipment 9, 1
0 is being driven, the dust generating equipment 9,
The drive state signal is inputted to the control mechanism 21 only from 10, and the control mechanism 21 controls each cylinder mechanism 17, 1 based on the input drive state signal.
8, 19, rotation speed control device 7 and electric damper 20
The output signal is output to each. Based on each output signal, the cylinder mechanism 17 closes the on-off valve 14, and the cylinder mechanisms 18 and 19 close the on-off valve 15 and 16.
Let's open. The rotation speed control device 7 includes a control mechanism 21
Based on the output signal from the motor 6, the rotation speed of the motor 6 is lowered from the full rotation state to the first predetermined state, and the suction flow velocity in each suction duct 12, 13 is not increased more than necessary as conventionally done. Based on the output signal from the control mechanism 21, the electric damper 20
The valve is opened to the first predetermined opening degree, and the atmosphere and the inside of the transport duct 3 are communicated with each other. The opening degree of the electric damper 20 corresponds to the rotation speed of the motor 6, and as the rotation speed of the motor 6 decreases, the opening degree of the electric damper 20 increases. Therefore, even if the rotation speed of the motor 6 decreases to the first predetermined state as described above, the atmosphere corresponding to that state will flow into the transport duct 3 via the electric damper 20, and the transport duct 3, a suction flow rate sufficient for transporting dust is ensured. To explain this more specifically, the atmosphere flows into the transport duct 3 via the electric damper 20.
When air flows into the air, the total suction flow rate of the atmosphere in the suction ducts 12 and 13 decreases compared to the case where the electric damper 20 is not opened, and the suction flow rate in each suction duct 12 and 13 decreases accordingly. Become. Therefore, the pressure loss in the suction ducts 12 and 13 decreases in proportion to the square of the decrease in the suction flow velocity, and the flow rate of atmospheric air sucked by the suction blower 2 increases accordingly. Therefore, the suction flow velocity within the transport duct 3 becomes high enough to transport dust, and no dust is deposited within the transport duct 3. However, based on the opening of the electric damper 20, each suction duct 12,
The reduction in the suction flow speed in the dust pump 13 is adjusted by the rotation speed of the motor 6 and the opening degree of the electric damper 20, and each suction speed does not decrease until it interferes with dust suction.

Dust generating equipment 8 and 9 stop, and dust generating equipment 1
0 is being driven, the dust generating equipment 10
Only the drive state signal is input to the control mechanism 21, and the control mechanism 21 sends output signals to each cylinder mechanism 17, 18, 19, rotation speed control device 7, and electric damper 20 based on the drive state signal. Output each. Based on each output signal, the cylinder mechanisms 17 and 18 close the on-off valves 14 and 15,
The cylinder mechanism 19 opens the on-off valve 16. Further, the rotation speed control device 7 lowers the rotation speed of the motor 6 to a second predetermined state lower than the first predetermined state, and does not increase the suction flow velocity in the suction duct 13 more than necessary. The electric damper 20 is opened to a second predetermined opening degree that is larger than the first predetermined opening degree based on an output signal from the control mechanism 21 . Air is introduced at a predetermined flow rate. As a result, as above,
Suction flow velocity sufficient for dust transport is ensured within the transport duct 3.

FIG. 2 shows another embodiment, and the same components as those in the previous embodiment are given the same reference numerals, and the explanation thereof will be omitted.

In this embodiment, a wind speed transmitter 2 is installed in the conveyor duct 3.
2 faces downstream from the connection portion between the suction duct 11 and the conveyance duct 3, and a wind speed transmitter 22 and an electric damper 20 are connected via a regulator 23.

With this configuration, the regulator 23 controls the opening degree of the electric damper 20 in accordance with the signal from the wind speed transmitter 22. Such a configuration is particularly effective when there are many dust generating facilities.

Note that the on-off valve is not limited to the electric damper 20 as in the above embodiment, but may be a manual valve.

(Effects of the invention) As described above, the present invention can ensure sufficient suction flow velocity for dust transport in the transport duct, so as the number of stopped dust generating equipment increases, the rotation speed of the suction blower can be reduced. Even if it is lowered, dust will not accumulate in the conveyance duct, and clogging in the conveyance duct can be prevented.

In addition, since the structure is such that it is sufficient to connect the on-off valve to the conveyance duct, it is not only easy to manufacture, but also can be assembled into existing equipment.

[Brief explanation of the drawing]

FIG. 1 is a conceptual diagram showing a dust collecting device according to the present invention, and FIG. 2 is a conceptual diagram showing a dust collecting device according to another embodiment. 1... Dust collector, 3... Suction blower, 3... Conveyance duct, 8, 9, 10... Dust generating equipment, 11, 12,
13...Suction duct, 14-16...Opening/closing valve, 17-
19...Cylinder mechanism, 20...Electric damper, 21...
Control mechanism.

Claims (1)

[Scope of Claim for Utility Model Registration] A conveyance duct connected to a dust collector equipped with a suction blower, a suction duct connected to the conveyance duct and facing each of a plurality of dust generating equipment, and a suction duct provided in each suction duct and each suction duct connected to a dust collector equipped with a suction blower. A valve mechanism that opens and closes the duct and the driving state of each of the dust generating equipment is detected, and as the number of stopped dust generating equipment increases, the rotation speed of the suction blower is reduced and the number of stopped dust generating equipment is reduced. a control mechanism for closing a valve mechanism provided in a facing suction duct, the dust collection device comprising: a control mechanism that closes a valve mechanism provided in a suction duct facing the suction duct; A dust collection device characterized by being equipped with an on-off valve that communicates and shuts off.