JPS5830160Y2 - Pump casing clearance adjustment device - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a clearance adjustment device for a pump using a semi-open impeller.

In pumps using semi-open impellers,
It is necessary to properly adjust the clearance between the front face of the impeller and the casing.

Conventionally, this clearance has been adjusted by interposing an adjusting shim 9 between the impeller and the shaft or by interposing a shim at the mounting portion of the casing.

However, this type of conventional device has the disadvantage that adjustment requires skill and takes a long time.

Therefore, an object of the present invention is to provide a pump casing clearance adjustment device that can easily adjust the clearance between the casing and the impeller.

According to the present invention, the casing that houses the impeller is provided with a flange that is fixed to a bracket that is fixed to the pump body,
An elastic bent portion is provided at the radially inner end of the flange, and the flange extends 7 radially outward from the bent portion.
A tightening means is provided for tightening the flange against the bracket in the axial direction, and a flexible gasket is provided between the flange and the bracket, thereby making it possible to adjust the side clearance between the casing and the impeller. be.

Therefore, a space is created between the bracket and the flange of the casing by the folded part, and the folded part engages with the bracket.

Therefore, when the 7 langes are tightened by the tightening means, the entire casing is elastically deformed using the tip where the bent part engages with the bracket as a fulcrum, and the entire casing approaches the bracket side, which increases the clearance between the casing and the impeller. can be adjusted.

Bolts and nuts can be used as the tightening means, and the tightening means or nuts are located outside the pump casing, so that adjustment operations can be carried out easily.

Since there is a space between the bracket and the flange, liquid will leak, so an elastic gasket is provided to prevent leakage in this area.

Therefore, the tightening member pulls the casing while compressing the elastic gasket, so that the sealing action is improved by tightening.

As described above, in the present invention, the flange of the casing has a spring effect, and the clearance can be freely adjusted using the tightening member.

Embodiments of the present invention will be described below with reference to the drawings in comparison with a conventional device.

FIG. 1 shows an example of a conventional adjustment device, in which a stepped portion 2a is formed at the tip of a rotary shaft 2 disposed within the pump body, and a stepped portion 2alC is The impeller 3 is installed with a key 4 and a nut 5.

A casing 6 is attached to surround the impeller 3.

Further, a dust-proof suction cover 7 is arranged outside the casing 6.

At this time, it is necessary to adjust the clearance C between the front surface of the impeller 3 and the casing to an appropriate value, but in the conventional device shown in FIG. The clearance C was adjusted by sandwiching the shim 8 and appropriately selecting the thickness of the shim 8.

Therefore, in this conventional device, the clearance C can only be measured after the impeller 3 is attached by sandwiching the shim 8 and the casing 6 is assembled, so the adjustment work requires reassembling several times. Next, in another conventional adjustment device shown in FIG. 2, the casing 6 and the suction cover 10 are formed separately, and the suction cover 10 is attached with a nut 9. Clearance Ct can be adjusted by inserting shim 8 for clearance adjustment.
-This is an adjustment.

The conventional adjustment device shown in FIG. 2 also has the disadvantage that the clearance C is measured only after assembly, making adjustment time-consuming.

The present invention solves the above-mentioned inconvenience, and the following is the third point.
Embodiments of the present invention will be described with reference to the drawings.

Also in the present invention, as in the conventional pump, the impeller 13 is attached to the tip end 12a of the rotary shaft 12 disposed within the pump body 11 by means of a key 14 and a nut 15.

A bracket 18 is attached to a bolt 21 on the front of the pump body 11.
Fixed by

The casing 16 is attached to the bracket 18, and the cover 17 is attached to the casing 16. In the present invention, the end of the flange portion 16a of the casing 16 is bent, and the tip of this bent portion is attached to the casing 16. is in contact with the side flange surface and has a spring action.

Then, bolts 22 installed radially outward from the bent portion of the flange portion are passed through the mounting holes of the flange 18 and tightened with nuts 19.

At this time, a flexible gasket 20 is interposed between the casing 16 and the flange 18.

Since the flange portion 16a of the casing 16 has a spring action, the amount of clearance C between the impeller 13 and the casing 16 can be freely adjusted by adjusting the force with which the nut 19 is tightened. can.

As described above, the present invention has the effect that the clearance can be adjusted at the same time as the casing is assembled, so the adjustment process can be omitted and the pump assembly process can be shortened.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing a conventional clearance adjustment device, FIG. 2 is a sectional view showing another conventional clearance adjustment device,
FIG. 3 is a sectional view showing the clearance adjustment device of the present invention. 1.11...Pump body, 2,12...
・Shaft, 3, 13... Impeller, 6, 16・
...Casing, 7,17...Suction cover, 18...Bracket, 19...Tightening nut, 20...Gasket.

Claims (1)

[Scope of claim for utility model registration] In a pump using a semi-open type impeller, the impeller is housed. A flange is provided on the casing to be fixed to a bracket fixed to the pump body, an elastic bent part is provided at the radially inner end of the flange, and the flange is attached to the bracket radially outward from the bent part. A pump characterized in that a tightening means is provided for tightening in the axial direction, and a flexible gasket is provided between the flange and the bracket, thereby making it possible to adjust the side clearance between the casing and the impeller. casing clearance adjustment device.