JPS595199Y2 - Liner ring adjustment device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a device for adjusting a liner ring in a double-suction centrifugal pump with open vanes.

Conventionally, in a double suction type centrifugal pump having open vanes, a liner ring 2 is attached to the outer peripheral edge of an open vane 1 as shown in FIG. ' is provided and is attached to the casing 3 with bolts 4 or the like.

However, in the conventional type, the attachment position of the liner ring 2 cannot be adjusted, that is, the size of the clearance ε' cannot be adjusted, so, for example, the open blade 1 and the liner ring 2 wear out over time, resulting in an increase in the clearance ε'. case,
Unless the liner ring 2 is replaced, the clearance ε′
In other words, performance degradation cannot be corrected without replacing parts.

In addition, due to changes in the conditions of foreign substances contained in the pumped liquid,
There are cases where it is necessary to increase or decrease the clearance ε' at the local pump station, but it has not been possible to respond to such situations, that is, changes in liquid quality.

For this reason, it has recently been considered to attach the liner ring to the casing so that its position can be adjusted so that the clearance can be increased or decreased as necessary, but this method is difficult to adjust or cannot be done reliably. There are many problems above.

The present invention was devised to solve such problems, and provides a practical liner ring adjustment device that can easily and reliably adjust the clearance.

Hereinafter, one embodiment of the present invention will be described with reference to FIGS. 2 and 3.

A liner ring 11 for an open blade 10 of a double-suction type centrifugal pump is provided with a cylindrical portion 14 of a predetermined length that protrudes toward the suction chamber 13 via a stepped portion 12, and an end portion of this cylindrical portion 14 on the suction chamber 13 side. A top having, for example, a flange-shaped projection 15 projecting toward the outer circumferential side.

The bottom is split in half.

On the other hand, the casing 16 includes the suction chamber 13 side and the main shaft 1 side.
A support ring portion 19 having a notch 18 formed in a ring shape and open on the side 7 is provided by tightening it with a pole 20 inserted in the radial direction, for example.

In addition, the casing 16 and the support ring part 19 also have upper and lower parts.
It is split in half.

Thus, the cylindrical portion 14 of the liner ring 11 is fitted and supported by the support ring portion 19 provided on the casing 16 so as to be movable in the axial direction of the main shaft 17, and the protrusion 15 of the liner ring 11 is fitted into and supported by the support ring portion 19 provided on the casing 16. It is inserted into the notch 18 via a spacer 21 having a split ring shape and having a predetermined thickness t, and is fixed with a bolt 22 inserted from the suction chamber 13 side in parallel to the main shaft 17.

Thereby, a predetermined clearance ε is provided between the open blade 10 and the liner ring 11.

Note that the step portion 12 of the liner ring 11 and the support ring portion 1
A predetermined gap t1 is provided between the liner ring 11 and the side surface of the liner ring 9 on the side of the pump chamber 23, so that the liner ring 11 can also be moved in a direction that increases the clearance ε.

With such a configuration, when adjusting the clearance ε, the casing 16 and the liner ring 11 are divided into upper and lower parts, and the liner ring 11 is attached and detached by operating the bolts 22 from the suction chamber 13 side. What is necessary is to replace it with one having a different thickness t.

Therefore, the clearance ε can be adjusted by simply replacing the spacer 21 without requiring replacement of the liner ring 11 itself. However, in the present invention, the attachment/detachment of the liner ring 11 and the replacement of the spacer 21 are performed using the supporting ring of the casing 16. Part 1
It is extremely easy to perform this operation only from one direction through the suction chamber 13 formed in 9 and the notch 18 that opens to the main shaft 17 side, that is, by using the wide open part. Moreover, since alignment is easy, the clearance ε can be set reliably.

In other words, the spacer 21 and the protrusion 15 of the liner ring 11 can be attached to and removed from the support ring portion 19, and the bolt 22 can be inserted and removed in the same manner from the suction chamber 13 side along the axial direction of the main shaft 17.

In the above embodiment, the support ring portion 19 is connected to the casing 1.
6, but this is because the machining of the threaded hole 24 for inserting the bolt 22 along the axial direction of the main shaft 17 is covered by the outer wall of the casing 16 (see Fig. 1). This is because machining is difficult or impossible in such a case, and therefore, if machining the screw hole is possible, it goes without saying that the support ring portion 19 may be constructed integrally with the casing 16.

Further, in the above embodiment, the support ring portion 19 is attached to the casing 1.
6) I fixed it at 20, but it is of course possible to use a cast-in recess.

It goes without saying that the spacer 21 may have a washer shape or any other shape.

[Brief explanation of drawings]

Fig. 1 is a schematic sectional view showing a conventional example, Figs. 2 and 3 show an embodiment of the present invention, Fig. 2 is a sectional view showing an enlarged main part, and Fig. 3 is a sectional view showing an enlarged view of the main part. FIG. 2 is a view taken in the direction of arrow III in FIG. 2; 10...Open blade, 11...Liner ring, 13...Suction chamber, 14...
・Cylindrical part, 15...Protrusion, 16...Casing, 17...Main shaft, 18...Notch, 19...Support ring part , 21...
Spacer, 22... Bolt, ε... Clearance.

Claims (1)

[Scope of utility model registration request] A liner ring for an open vane of a double suction type centrifugal pump is attached to a casing with a predetermined clearance provided between the open vane and the liner ring, and the liner link protrudes toward the suction chamber side. The cylindrical portion is provided with a cylindrical portion and a protrusion projecting in the outer circumferential direction from the suction chamber side end of the cylindrical portion C. At the same time, the protrusion is formed to be open to the suction chamber side and the main shaft side of the support ring crucible, or a bolt is inserted through a spacer and inserted parallel to the main shaft from the suction chamber side. A liner ring adjustment device that is fixed.