JP3545638B2 - Mounting structure of impeller to rotating shaft - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a mounting structure of an impeller with respect to a rotation shaft of a liquid sending pump, and more particularly, to provide a spiral groove or the like in a shaft hole of the impeller and a partitioning back plate on a back surface of the impeller to discharge and clean. The present invention relates to a structure for mounting an impeller with respect to a rotary shaft of a pump so as to improve the above.
[0002]
[Prior art]
A conventionally known mounting structure of the impeller to the rotary shaft of this type of pump has neither the above-mentioned groove nor the partition back plate (see FIGS. 5 and 6).
[0003]
When pumping a fluid such as high-temperature milk with a pump having such a structure, the fluid may enter the fitting portion between the impeller and the shaft, stagnate, and may be scorched without being discharged. There is a problem that is not preferable in maintaining sanitary properties, such as taking a long time when washing in preparation for use, and sometimes not being able to wash.
[0004]
[Problems to be solved by the invention]
The pump according to the present invention has been developed in order to solve the above-described problems, and an object of the present invention is to provide a novel impeller mounting structure for a rotary shaft of the pump. .
[0005]
[Means for Solving the Problems]
In order to achieve the above object, the mounting structure of the impeller with respect to the rotary shaft of the pump according to the present invention is configured such that the shaft hole at the center of the hub of the impeller is fitted and stopped at the tip of the rotary shaft protruding into the case. A pump provided with an impeller, wherein a groove is provided on the contact surface of the shaft hole with the rotating shaft, one end of which is in front of the hub and the other end of which is open on the back, and a partition back plate on the back of the impeller, and a case. Inside the back wall of the rear face of the partition wall, a recess having a diameter slightly smaller than the outer diameter of the partition back panel is provided at a position facing the partition back panel, and the shaft of the impeller hub is appropriately provided. The groove provided in the hole has a spiral, linear or curved shape.
[0006]
[Action]
The present invention provides a spiral groove or the like that is open at both ends on the impeller side of the fitting portion and a partition back plate on the back side of the impeller to generate a high pressure on the back side of the impeller, thereby improving the discharge performance. , Thereby preventing scorching of the fluid and at the same time improving the cleaning performance.
[0007]
【The invention's effect】
The mounting structure of the impeller with respect to the rotating shaft according to the present invention is such that the drainage and cleaning properties are improved by providing a spiral groove or the like and a partition back plate as described above. It has a remarkable effect that can completely achieve the purpose.
[0008]
【Example】
The embodiment shown in the figure is a booster pump in which an impeller 6 is attached by fitting and stopping a shaft hole 5 at the center of a hub 4 to a tip 3 of a rotating shaft 2 protruding into a pump case 1, On the contact surface of the shaft hole 5 with the rotating shaft 2, a spiral groove 7 having one end opened in front of the hub 4 and the other end opened in the back is provided, and a partition back plate 8 is provided on the back of the impeller 6. A recess 9 having a diameter slightly smaller than the outer diameter of the partitioning back plate 8 is formed at a position facing the partitioning back plate 8 inside the back wall 14 of the above, so that the remarkable effect as described above is obtained. It was made.
[0009]
The impeller 6 is prevented from coming off by the pin 10 and is pushed out in the direction of coming off by the spring 11, so that the clearance 12 between the peripheral portion of the partition back plate 8 and the opening edge of the recess 9 is appropriately maintained. The pump case 1 and the rotary shaft 2 are hermetically sealed by a positive pressure seal structure 13.
[0010]
The present invention can be implemented with a groove shape other than a spiral shape, for example, a linear shape, a curved shape, or a spiral shape or the like provided on the circumferential surface of the rotating shaft. Accordingly, various modifications can be made without departing from the spirit of the present invention, and the present invention naturally extends to such modified mounting structures.
[Brief description of the drawings]
FIG. 1 is a sectional view of a main part showing an embodiment of the present invention.
FIG. 2 is a sectional view taken along the line AA of FIG. 1;
FIG. 3 is a rear view showing the impeller.
FIG. 4 is a cross-sectional view taken along the line BB of FIG. 3;
FIG. 5 is a sectional view of a main part showing a conventional example.
FIG. 6 is a sectional view taken along the line CC in FIG. 5;
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Case 2 Rotating shaft 3 Tip part 4 Hub 5 Shaft hole 6 Impeller 7 Spiral groove 8 Partition back plate 9 Depression 10 Pin 11 Spring 12 Clearance 13 Seal structure 14 Back wall

Claims (2)

A pump in which an impeller is mounted by fitting and stopping a shaft hole at the center of an impeller hub to a tip end of a rotation shaft protruding into a case, wherein one end of the pump is provided on a contact surface of the shaft hole with the rotation shaft. Is provided with a groove at the front of the hub, the other end of which is open at the back, a partition back plate at the back of the impeller, and the outside of the partition back plate at a location inside the back wall of the case opposite to the partition back plate. A mounting structure for an impeller with respect to a rotating shaft, wherein a recess having a diameter slightly smaller than the diameter is provided. 2. The mounting structure for an impeller with respect to a rotating shaft according to claim 1, wherein the shape of the groove provided in the shaft hole of the hub of the impeller is spiral, linear, or curved.

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