JPS6242125Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a screw pump, and relates to an improvement in the impeller to facilitate its manufacture.

FIG. 1 is a side view schematically showing the screw pump, and FIG. 2 is a sectional view taken along line A--A in FIG. 1. In these figures, 1 is a screw main body having one or several blades, and its shaft 3 is connected to the upper and lower pairs of screws while maintaining a slight gap C with respect to the inclined concrete trough 2 that serves as the casing. It is held by bearings 4 and 5. Also, axis 3
is connected to a drive machine 6, and is rotated in the direction of the arrow. Note that 7 is a guide.

This screw pump has its lower part submerged in the suction water level at a low level, and its upper part located at the discharge water level, and is driven to rotate by a drive unit 6, whereby water is pumped up along the concrete trough 2 by the screw main body 1. .

By the way, with the screw pump, it is very difficult to create a gap C between the screw body 1 (ie, the blade) and the concrete trough 2 to a predetermined value. FIG. 3 is an enlarged view of a part of FIG. 1, and the gap C is created by lathing a surface finishing mortar 9 on the surface of the concrete groove 8 that has already been poured, and then combining this mortar 9 with the blades 10 of the screw body. is formed between.

In order to obtain this clearance C over the entire length of the screw pump, conventionally, a round bar or shaped steel, etc. is temporarily attached to the outer peripheral edge of the blade 10, and the screw is placed in the concrete groove 8 to which unsolidified mortar is adhered. Main body 1
After the mortar has completely solidified, the temporary attached members such as round rods are removed from the blade 10. In other words, the thickness of the removed member such as the round bar becomes the gap C.

Such a conventional method requires many man-hours for attaching members such as round bars to the outer periphery of the blade 9, man-hours for removing the mortar after solidification, and many man-hours for finishing and repairing the outer periphery of the blade, and is inefficient. The problem was that they were forced to work for long hours.

The present invention has been made with the aim of solving these conventional difficulties. An embodiment of the present invention will be described in detail below with reference to FIGS. 4 to 6.

FIG. 4 is a partially enlarged view of the tip of the vane used in the screw pump of the present invention, and FIG. 5 is a sectional view taken along the line B--B in FIG. 4. The blade 20 shown in these figures corresponds to the conventional blade 10 shown in FIG. 3, but in the initial state, it is formed between the screw body 1 and the concrete trough 2. Considering the dimension of the gap C, the diameter of the blade 20 is finished to D+2C. Here, D is the screw diameter. A V-shaped groove 21 is continuously formed at a position having a diameter D, and notches 22 are provided at appropriate intervals so as to reach the groove 21 from the peripheral edge.

A screw main body 1 having such a blade 20
When the blade 20 is rotated in the conventional manner in a concrete groove 8 to which unsolidified mortar is adhered, as shown in FIG. As shown in Figure d, the tip 23 is successively bent from the groove 21 due to the raking force during trough mortar finishing, and finally the tip 23 is separated as shown in Figure d. Therefore, by removing the tip portion 23, a predetermined gap C is formed between the screw body 1 and the concrete trough 2.

As described in detail above, according to the present invention, in order to obtain a predetermined blade clearance, there is no need for the troublesome work of attaching or removing special members as in the past, and the outer periphery of the blade is , is formed larger by the gap C, and the tip of the blade corresponding to the gap C is broken and removed during trough mortar finishing, so the work efficiency can be dramatically improved.

It goes without saying that in the case of a screw having several blades, the present invention may be applied to at least one blade, and the other blades may be left in the same manner as before.

[Brief explanation of the drawing]

Figure 1 is a side view showing the outline of the screw pump, Figure 2 is a sectional view taken along line A-A in Figure 1, Figure 3 is an enlarged view of a part of Figure 1, and Figure 4 is the main part of the pump. FIG. 5 is a plan view showing an enlarged tip of the blade used in the screw pump according to the invention.
FIG. 6, a sectional view taken along line -B, is a diagram shown for explaining the operation of the present invention. 1...Screw body, 2...Concrete trough, 3...Shaft, 9...Mortar, 20...Blade,
21...Groove, 22...Notch.

Claims (1)

[Scope of utility model registration request] In a screw body used in a screw pump having a mortar-finished inclined concrete trough as a casing, the outer diameter of at least one of the screw blades installed on the drive shaft is increased by the amount of the gap provided between the outer periphery of this blade and the trough surface. 1. A screw main body, characterized in that a circumferential groove and a radial notch are provided on the outer periphery of the blade, and a portion enlarged by the gap can be broken by external force.