JPS5943288Y2 - Constant air flow control device for pneumatic conveyance equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a device for controlling the amount of air in a pneumatic waste transport device.

Recently, collection and transportation using vacuum pipelines has been attracting attention and being put into practice as a rational method for collecting and transporting municipal waste.

As shown in FIG. 1, one collection system 3 is formed by connecting garbage posts 1a to 1m installed at required intervals to a branch pipe 2, and each branch pipe 2 of several collection systems 3 is connected to the branch pipe 2. The cut pulp 4 is connected to a transport main 5 which is connected to an air source 10 of a collection station 6 to form a basic collection line.

When collecting garbage stored in each garbage post 1a to 1m of one collection system 3, first, the atmospheric intake valve 9 in the collection station 6 and the cut valve 4 of the corresponding collection system are opened. After that, the air source 10 is driven, and then,
When the air intake valve (not shown) of one garbage post 1a is opened and the atmosphere intake valve 9 is closed, air flows in from the air intake valve, and this inflow air causes the garbage post 1 to be closed.
The garbage stored in a is transferred to a separator 7 of a collection station 6 through a branch pipe 2 and a main pipe 5.

When the garbage collection of the garbage post 1a is completed, the air intake valve (not shown) of the next garbage post 1b is opened, and the air intake valve of the previous garbage post 1a is closed. The garbage stored in 1b is transferred to separator 7.

By performing these operations sequentially, each garbage post 1
Garbage accumulated within 0 to 1 m is successively collected in a separator 7.

Now, assuming that the pressure of the transport air is P, this pressure P is the distance t from station 6 to the corresponding Go □ post 1, the wind speed V,
It is a function of the weight W of garbage and other factors, and if the distance between each garbage post 1a to 1m4 is t1 to tm, the transportation pressure required to transport garbage within each garbage post 1a to 1m is the characteristic shown in Figure 2. It is expressed as shown by curves 1 to Im.

Also, the pressure CP of the air source 10) - air volume (Q characteristic is the curve ■
It is expressed as shown in .

It is assumed that the weight W of the garbage in each garbage droplet Ha~1 m is constant.

Then, find the air volume Qm and wind speed Vm necessary to transport the garbage of 1 m from the garbage post located farthest from station 6, that is, the intersection Xm of the curve Im and ■.
is the planned operating point, and the air volume Q corresponding to this operating point
m and wind speed Vm are determined as the planned air volume and wind speed of the collection device, respectively.

However, in the conventional device described above, if the operating point (planning point) 1 <
trn) When transporting garbage at the garbage post Ha, the intersection X1 of the curved line and ■ becomes the operating point, and this operating point
The air volume Q1 and wind speed ■1 are the air volume Qm and wind speed Vm.
significantly larger than.

That is, the closer the garbage post is to the station 6, the greater the wind speed (2) and the air volume (Q) of the inflowing air.

On the other hand, the go post is configured and buttoned according to the capacity of the transport device, that is, the amount of transport. Therefore, the silencer (not shown), air intake valve, etc. are also set to the minimum necessary size. ing.

Therefore, when transport air of a predetermined air volume Qm and wind speed Vm flows into the garbage posts 1a to 1m, these garbage posts 1a to 1m do not generate any noise when the air flows in.

However, in the above-mentioned conventional device, as mentioned above, the closer the garbage post is to the air source, the greater the air volume Q and wind speed ■ are than necessary. Therefore, there was a drawback that the silencer of the post was also large and the cost was high.

This invention was made with the purpose of eliminating the above-mentioned drawbacks.
To provide a constant air volume control device in a pneumatic transportation device which prevents noise from a garbage post by always keeping the amount of air flowing into the garbage post constant regardless of the distance from the station.

Hereinafter, the present invention will be described in detail based on an embodiment of the present invention with reference to the accompanying drawings.

Referring to FIG. 3, an air volume control device 15 is provided for the main air pipe connecting the pack filter 8 of the collection station 6 and the air source 10.

This air volume control device 15 includes an air volume detector 16 and an air volume control valve 1.
7, an air volume detector 15 is connected to the main air pipe 11, detects the amount of conveyed air in the air pipe 11, outputs a corresponding signal, and applies it to the air volume control valve 17.

This air volume detector 16 is composed of, for example, an orifice plate, and such an air volume detector is well known.

The air volume control valve 17 is connected between the main air pipe 11 and the xylencer 12 via the air pipe 13.

In addition, when the atmospheric air suction valve 14 as a safety device is provided, the air volume control valve 17 is connected so as to bypass this atmospheric suction valve 14 as shown in the figure.

This air volume control valve 1T is controlled to open and close according to a signal from the air volume detector 16.

This air volume control valve 17 is, for example, a diaphragm type control valve, and such a control valve is well known.

The atmospheric air intake valve 14 and the air volume control valve 17 may be arranged in either order.

When the air volume in the transport pipe 5 changes by ΔQ from the standard air volume Qs due to the characteristics of the air source, the air volume detector 16 controls the opening and closing of the air volume control agent 7 in accordance with this change ΔQ, and the transport pipe 5 Control is performed so that the air volume within is always equal to the reference air volume Qs.

That is, for example, when the air volume in the transport pipe 5 increases by ΔQ, the air volume control valve 17 is opened in accordance with this increase ΔQ, and air is bypassed from the atmosphere via the silencer 12 by the increased amount ΔQ. It flows into the main air pipe 11.

Therefore, the air volume in the transport pipe 5 becomes the standard air volume Qs.

In this way, the air volume inside the transport pipe 5 can be kept constant.

Then, as described above, as shown in FIG. 4, the wind speed Vm of the transportation air necessary for transporting garbage with the characteristic curve Im of the garbage post 1 m located at the farthest distance tm from the station 6 and the characteristic curve 1 m of the air source 10, Set air volume Qm and transportation pressure Pm.

Of course, the weight W of the garbage to be transported is assumed to be constant.

Further, the value of the airflow detector 16 is set to the airflow at this planning point Xm, and this airflow Qm is set as the reference airflow.

Now, for example, when transporting garbage from garbage droplet Ha located at the closest distance t1 from station 6, the operating point moves to the intersection X1 of characteristic curves ■1 and ■, and the transportation pressure in transport pipe 5 is Pl. The wind speed and air volume both increase to ■1 and Ql, respectively.

The air volume detector 16 immediately detects when the air volume in the main air pipe 11 increases, outputs a signal corresponding to the increase ΔQ1 (=Q1°0m), opens the air volume control valve 17, and removes the air from the garbage post. Control is performed so that the inflow air volume, that is, the air volume of the air volume detection unit 16 is constant.

Therefore, the air volume corresponding to the increase ΔQ flows from the atmosphere into the main transport pipe 11 via the air volume control valve n.

Therefore, the air flow inflow operating point from the garbage post is characteristic curve 1.
1 at point x'lt, the air volume in the transport pipe 5 is Qm, and the transport pressure is the pressure P' required for this air volume Qm.
□, and the operating point of the air source 10 is Xl.

Therefore, the wind speed and air volume of the transportation air flowing into the garbage post 1a are the standard wind speed Vm and the standard air volume Qm, and the garbage post 1a is driven by the incoming air.

It doesn't make any noise. In addition, the air source 10 is a transport pipe 5
It is driven in accordance with the transportation pressure while keeping the air volume inside constant, and therefore, when there is no load, the power is considerably reduced, resulting in economical operation.

Of course, even if the load changes during garbage collection operation of the same garbage post, the air volume is controlled in the same manner as described above.

Incidentally, in this embodiment, the go post has been described, but it is also possible to control the constant air volume of the dust chute in the same way.

As explained above, according to the present invention, the wind speed in the transportation pipe can be kept constant regardless of the distance from the garbage collection station to each garbage post t or fluctuations in the transportation pressure during transportation. Since the air source is operated according to the load factor, the motive power of the air source is reduced, and economical operation can be achieved.

[Brief explanation of the drawing]

Fig. 1 is a schematic diagram of a pneumatic transport type garbage collection and transport device, Fig. 2 is an explanatory diagram of the operation of a conventional transport device, and Fig. 3 is an example of a constant air volume control device in a pneumatic transport device according to the present invention. The figure shown in FIG. 4 is an explanatory diagram of the operation of the device of the present invention. 1a~1m...garbage post, 2...branch pipe, 4...cut valve, 5...main pipe, 6...collection station, 7...Separator, 8...Pack filter, 9...
Air intake valve, 10... Air source, 11...
・Main air pipe, 12... Silencer, 13...
...Air pipe, 14...Atmosphere intake valve, 16...
...Air volume detector, 17...Air volume control valve.

Claims (1)

[Scope of utility model registration request] In a garbage collection and transportation device that transports garbage to a collection station 1 using a pneumatic transportation method, the main air pipe between the separator of the collection station and the air source detects the air volume of the main air pipe and sends a corresponding signal. An output airflow detector is connected to the main air pipe on the negative side and to the silencer on the other side, and the opening degree is controlled according to the signal to detect the airflow from the garbage transport air intake regardless of the airflow flowing to the air source. 1. A constant air volume control device for a pneumatic transport device, characterized in that it comprises an air volume control valve for chemotaxis.