JPH0811617B2 - Screw pump - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention is used when transporting a transported material, for example, sludge such as sludge accumulated on the seabed, an intake of a power plant, a lake, a river, a port, or the like. Related to screw pumps.

[Prior Art] A screw pump that has been already proposed has a gutter with a semicircular cross section in the lower part, and screw blades are rotatably arranged in the gutter so that the screw blades are arranged along the screw surface of the screw blade. It was configured to send packages (eg, Mechanical Engineering Handbook, 6th Edition, pages 16-30).

[Problems to be Solved by the Invention] However, the conventional screw pump has a structure in which the package is simply introduced into the inside of the screw pump from the intake port, so that the efficiency of capturing the package is poor. There was a drawback.

[Means for Solving the Problems] In the first invention, a screw conveyor having an intake port at one end and a discharge port at the other end, and a screw conveyor rotatably provided on the intake port side of the screw conveyor and agitated A screw pump, comprising: an inlet device having a screen and a scraping plate; and an input port for feeding a transported material to the inlet device, and a screw conveyor having a machine length of 5 to 10 times the screw diameter, the stirring screen Is a plurality of screen blades arranged on the outer periphery of the screw conveyor and connected to each other in a substantially polygonal ring shape on the substantially same plane in the axial direction at equal pitches. The screw is arranged on the outer periphery of the screw conveyor and extends in the axial direction, and the radius of gyration of the front end in the rotation direction is larger than the radius of gyration of the rear end in the rotation direction. Position consists in close proximity to the screw blade of the screw conveyor, the rotational direction of the stirring screen and the writing plate has both a structure in which a direction opposite to the rotating direction of the screw conveyor.

According to a second aspect of the invention, in the screw pump of the first aspect of the invention, an openable and closable foreign matter discharging portion is provided below an inlet device provided rotatably around a horizontal axis.

[Operation] In the screw pump of the present invention, the transported material is sent to the inlet device side by the hopper and is further positively taken into the screw conveyor by the inlet device. Greatly improved.

If a foreign matter discharging portion is provided below the inlet device, an unnecessarily large rock or foreign matter can be taken out from the discharging portion.

[Example] Hereinafter, the present invention will be described in detail with reference to an example shown in the drawings.

FIG. 1 is a sectional view showing an embodiment of the screw pump according to the present invention, and FIG. 2 is a sectional view taken along the line II-II in FIG.

The screw conveyor 1 is configured to include a cylindrical tubular body 2 and a screw 3 rotatably housed in the tubular body 2, and the screw 3 conveys a transported object (soft mud such as sludge). It can be transported. The screw 3 is a pulley 4 connected to one end of the cylindrical body 2 on the discharge port side.
It is configured to be rotationally driven via.

Further, an inlet device 6 for scraping a transported object into the screw conveyor 1 is provided on the intake port 5 side of the screw conveyor 1. This inlet device 6 is
On the intake port 5 side of the screw conveyor 1, a rotary cylinder 7 coaxially attached to the screw conveyor 1 and rotatable about an axis, a bracket 8 attached to one end side of the rotary cylinder 7, The structure includes a scraping plate 9 supported and fixed to the bracket 8 and arranged around the screw 3, and a stirring screen 10 provided on the outer peripheral side of the scraping plate 9. The scraping plate 9 is the screw conveyor 1
Is disposed on the outer periphery of the screw 3 and extends in the axial direction by about the hopper width, and the radius of rotation of the front end in the rotation direction is larger than the radius of rotation of the rear end in the rotation direction, and the rear end position is the screw conveyor. It is disposed close to the screw 3 of No. 1. The stirring screen 10 is for preventing an unnecessarily large rock or foreign matter from entering the cylindrical body 2 through the intake port 5, and is a ring having a substantially triangular shape as shown in FIG. A plurality of (in the present embodiment, eight) members are provided in the shape of a member and are separated from each other by a predetermined distance in the axial direction of the screw 3. In addition, the rotary cylinder 7
Has its other end connected to the taper shaft 12 through an end plate 11, and the rotary cylinder 7 is rotated by rotationally driving the gear 13 fixed to the open end side of the taper shaft 12. It is configured. A bearing 12a for the tapered shaft 12 is fixed to a part of a side wall of the hopper 14.

The stirring screen 10 and the scraping plate 9 are not limited to the substantially triangular shape composed of three members, as shown in FIG. 2, and may be polygonal shapes such as a quadrangle and a pentagon. You can Further, when the stirring screen 10 and the scraping plate 9 are both rotated in the opposite direction to the screw 3, the efficiency of taking in the mud into the screw 3 is further improved.

Reference numeral 14 is a hopper which is fixed to the outer periphery of the cylindrical body 2 so as to surround the inlet device 6 and which is an inlet for the soft mud. The hopper 14 is formed in a trumpet shape with its upper end opened.
Moreover, the lower end 14b has a closed structure. A foreign matter discharge port 14a that can be opened and closed is provided on the side wall on the lower end side of the hopper 14 as shown by the arrow X in FIG.

Further, a centrifugal pump type impeller 16 is provided on the discharge port 15 side of the screw conveyor 1. The impeller
16 operates at the same time as the rotation of the screw shaft 3a, and sends the transported material from the discharge port 15 to the discharge pipe 18 by centrifugal force.

Then, the machine length of the screw conveyor (the center of the hopper to the center of the discharge port 15) is determined within a range of about 5 to 10 times the screw diameter.

 Next, the operation will be described.

First, at the same time when a package is loaded into the hopper 14 through its upper end opening 14c, the inlet device 6 is moved in a direction (arrow B in FIG. 2) opposite to the rotation direction of the screw 3 (arrow A in FIG. 2).
Direction). That is, by rotating the gear 13, the taper shaft 12, the rotary cylinder 7, the scraping plate 9 and the stirring screen 10 are integrally rotated in the direction of arrow B in FIG. Then, the transported material is stirred by the stirring screen 10 and then taken into the cylindrical body 2 from the taking-in port 5 by the rotation of the scraping plate 9. At this time,
The foreign matter 19 mixed in the transported material is prevented from entering through the intake port 5 by the agitation screen 10, is accumulated in the lower end 14b of the hopper, and is appropriately discharged from the foreign matter discharge port 14a to the outside of the hopper 14.

On the other hand, the transported matter taken into the cylindrical body 2 is the screw 3
Is moved to the right (the discharge port 15 side) in the cylinder 2 by the rotation of
It is discharged from the discharge port 15 to the discharge pipe 18. At the time of this discharge, the transported material is pumped and discharged from the discharge port 15 into the discharge pipe 18 by the centrifugal force generated by the rotation of the impeller 16.

The purpose of the screw 3 is to cut out the transported material quantitatively by controlling the number of revolutions, to hold the pushing pressure of the transported material, and to prevent the air from flowing backward for sending the transported material under a mixed pressure. Therefore, the length of the screw conveyor should be at least 5 times the screw diameter and 10 times or less.
Even if it is longer than this, the above-mentioned effect does not change much.

The pitch between the screws 3 may be set at the same interval, but as shown in FIG. 1, the pitch on the intake port 5 side should be wide and the pitch on the intake port 15 side should be gradually narrowed. As a result, the filling rate can be increased and the pumping force can be increased.

Although the screw conveyor 1 is used as a horizontal type in the above-described embodiments, it is not limited to this and may be used as a vertical type.

Further, instead of the hopper 14, an input port communicating with the transportation pipe can be used.

The screw pump of the present invention can transport various substances. In addition, for example, when a sludge such as sludge is transported, a powdery or slurry solidifying agent may be added to the sludge and the mixture may be kneaded and pressure-fed.

[Advantages of the Invention] As described above, according to the present invention, since the inlet device is provided on the intake side of the screw conveyor, the transported object is efficiently taken into the screw conveyor,
This has the effect of significantly improving the uptake efficiency as compared with the conventional case.

Further, by providing the foreign matter discharging portion, it is possible to quickly discharge an unnecessarily large rock or foreign matter.

Then, the machine length of the screw conveyor is set to 5 of the screw diameter.
Since the length is doubled to 10 times to a certain extent, even if this screw conveyor is used as a mud-feeding device for a mixed-pressure feeding device, air does not flow backward and cause any trouble.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of the screw pump according to the present invention, and FIG. 2 is a sectional view taken along the line II-II in FIG. DESCRIPTION OF SYMBOLS 1 ... Screw conveyor, 5 ... Intake port, 6 ... Inlet device, 9 ... Scraping plate, 10 ... Stirring screen, 14 ... Hopper (input port), 15 ... Discharge port, 16 ... Impeller.

Claims (2)

[Claims] 1. A screw conveyor having an intake port at one end and a discharge port at the other end, and an inlet device rotatably provided on the intake port side of the screw conveyor and having a stirring screen and a scraping plate. A screw pump having an inlet for feeding a transported material to the inlet device and having a machine length of the screw conveyor of 5 to 10 times the screw diameter, wherein the stirring screen is arranged on the outer periphery of the screw conveyor. The screen blades, which are connected to each other in a substantially polygonal ring shape on the substantially same plane, are arranged in a plurality of stages at equal intervals in the axial direction, and the scraping plate is arranged on the outer periphery of the screw conveyor. And the radius of gyration of the front end in the rotational direction is larger than the radius of gyration of the rear end in the rotational direction, and the rear end position is the screw of the screw conveyor. A screw pump characterized in that the rotation direction of the stirring screen and the scraping plate are in the direction opposite to the rotation direction of the screw conveyor, the rotation direction being close to the screw blade. 2. The screw pump according to claim 1, further comprising an openable / closable foreign matter discharge portion provided below an inlet device provided rotatably around a horizontal axis.