JPS5888497A - Impeller for pump - Google Patents

Abstract

PURPOSE:To simply the shape as well as to enable the way of machining and materials to be improved so as to reduce the cost and improve the quality by forming the impeller body consisting of blade parts integrated with the boss part, and the base plate to cover the blade parts, in two divided sections. CONSTITUTION:An impeller 7 forms dividingly an impeller body 7a in which blade parts 16 and a boss part 8 are integrated with each other and a base plate 17 to cover th blade parts 16. And, the impeller 7 and a motor shaft 6 are reliably fixed to each other in such a way that screwed-up fixation of the motor shaft 6 and the impeller 7 is done in a manner of tightening them in the reverse direction to the turning direction. By such a constitution, any article which was obliged to be formed using aluminum, etc. in the past can be now obtained by injection forming of thermoplastic resin, such as polypropylene, etc. with improvement of processing, together with improvement on materials, such as resistance against corrosion as well as low-cost production.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to the improvement of the impeller of a pump used, for example, for circulating washing water in a dishwasher or spraying washing liquid in a washing machine, by simplifying the structure and assembly of the impeller. , together with the cost.

It is also d to aim for an advantage in terms of quality.

Conventional pump impellers have a shape as shown in Figure 3, with the blade part a and the base plate that covers it all integrated.Moreover, because the shape is complex, there are difficulties in processing methods and materials. Due to restrictions, they were generally formed by casting metal materials such as aluminum.

For this reason, processing costs and material costs are high, and in terms of performance, aluminum materials cannot be said to have excellent corrosion resistance, and are not satisfactory in terms of both cost and quality.

The present invention aims at simplifying the shape of the impeller by making it into a split structure, making it possible to improve processing methods and materials, and aiming at reducing costs and improving quality.O The following is an example of the present invention. This will be explained with reference to the attached drawings.

1 and 2, 1 is a motor for driving the pump, 2 is a bracket fixed to the motor 1 with a screw 3, and 4 is a first bolt fixed to the bracket 2 with a tightening means 6 consisting of a bolt and a nut. In the pump casing, reference numeral 6 denotes a motor shaft, the tip of which is threaded, and this tip is threadedly connected to a shaft bushing 9 that is integrally inserted into the boss portion 8 of the impeller 7. Further, the tightening method by this screwing is formed in a direction opposite to the rotation direction of the impeller 7.

1o is a seal ring inserted into the boss portion 8 of the impeller 7;
A floating seat 11 is inserted into the first pump casing 4 and constitutes a so-called mechanical seal. 12 is the second pump casing, backing 13
By tightening the screw 14 through the first pump casing 4
Fixed.

16 is the water receiver of the circulation pump, and in this embodiment,
It is formed integrally with the second pump casing 12.

By driving the motor 1, the impeller 7 also rotates 1 in the same direction as the rotation direction of the motor 10, sucking in circulating water in the direction of arrow A and discharging it in the direction of arrow A. At this time,
The impeller 7 is acted upon by the circulating water, and a force is applied in a direction opposite to the direction of rotation of the impeller 7.

Therefore, by screwing and fixing the motor shaft 6 and impeller 7 in a direction opposite to the rotation direction,
A force is always applied in the tightening direction of the screw engagement, so that the impeller 7 and the motor shaft 6 are securely fixed.

Next, impeller 7. Regarding details - The feature of the 0 impeller 7 that will be explained is that by forming the impeller itself in parts, we were able to improve workability and quality. Processing method based on shape,
By dividing and forming items that were subject to material constraints, the shape has been simplified, and items that previously had to be formed using aluminum or other materials through casting process,
This makes it possible to injection mold the thermoplastic resin such as polypropylene, which provides effects such as improved processability and improved corrosion resistance.

That is, the impeller 7 is divided into an impeller body 7a in which the impeller body 7a is integrally formed with the impeller part 16 and the boss part 8, and a base plate 17 that covers the impeller part 16. 18 and 19 are provided, and the impeller 7 is formed by threading the threaded portions 18 and 19 together.

- By screwing the threaded parts 18 and 19 in the same direction as the rotation direction a of the impeller, a force is applied to the impeller main body 7a and the base plate 17 in the direction of tightening. death,
Securely fixed. This is because, when the impeller main body 7a rotates, rotational force acts on the base plate 17 only through the threaded portions 18.degree.
19, it is impossible for the impeller main body 7a and the base plate 17 to loosen and come off.

Furthermore, since the blade portion 16 and the boss portion 8 of one of the divided bodies of the impeller 7 are integrally formed, the blade portion 16 may be eccentric with respect to the center of the boss portion 8 during processing.

Surface runout is unlikely to occur.

As described above, according to the present invention, by forming the impeller, which was conventionally formed into one body, into two pieces and screwing the two together, it is possible to simultaneously improve workability and improve material quality. , it is possible to obtain a pump impeller with stable quality at a low cost.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a circulation pump according to an embodiment of the present invention, FIG. 2 is an exploded perspective view of its impeller, and FIG. 3 is an external perspective view of a conventional impeller of this type. 7a---Impeller body, 8---Boss part,
16...Blade portion, 17...Base plate,
18.19...Threaded part.

Claims (2)

[Claims] (1) An impeller for a pump in which an impeller main body integrally having a blade portion and a boss portion and a base plate covering the blade portion are formed separately, and the two are screwed together. (2) The impeller for a pump according to claim 1, wherein the direction in which the impeller body and the base plate are screwed together is tightened in the same direction as the rotation direction of the impeller body.