JPS5918297A - Scroll pump - Google Patents

Abstract

PURPOSE:To prevent a pump casing from being made larger in the size thereof by a method wherein the volumetric expansion of water when it freezes is absorbed by a static vane for guiding which has a large volume. CONSTITUTION:The static vanes 10 for guiding are fitted detachably into an annular groove 4d at the inner peripheral surface thereof and close an opening 1e at the side of the side faces of four sets of water paths 1c by the end face 10a of the outer rim thereof. The one surfaces of four sets of engaging parts 10b, which are formed integrally and having the section of substantially rectangular shape, are engaged with the engaging part 1d of the water path 1c to regulate the pivoting of the static vane 10 for guiding. The inner peripheral surface of an annular liner ring 8, fitted to a fitting hole 4e, is made to oppose to the outer peripheral surface of the suction port 6a of the impeller 6 through a fine gap.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in a centrifugal pump, and more particularly to prevention of freezing and damage in a centrifugal pump having stationary guide vanes.

A conventional type of centrifugal pump will be explained with reference to FIG. In the figure, reference numeral 1 denotes a bracket that is screwed to one end of a frame (not shown) of an electric motor, and has a through hole 1a in its center. 21 [! ! 3 is a shaft sealing member consisting of a mechanical ring fitted to the rotor shaft 2 and the bracket 1, respectively; 4 is an airtight seal to the bracket 1 via an O ring 5; The impeller chamber 4 is threadedly connected to the pump casing in cooperation with the bracket 1.
A is formed 17. 4b is a suction channel formed in the axial direction approximately at the center of the pump casing 4; 40 is a discharge port provided at the upper side of the pump casing 4 in the drawing;
Reference numeral 6 denotes a protrusion inside the impeller chamber 48 of the rotor shaft 2 (a thin-shaped impeller fitted therein; the suction port 4) is formed with a suction port 6a and a plurality of discharge ports 6b facing each other. There is. 71, a roughly annular protrusion 7a formed on the outer periphery of a stationary guide vane made of cast iron is a bracket! The through hole 7h formed in the inner circumferential portion is opposite to the outer circumferential surface of the suction port 6a of the thin impeller 6 through a gap. are doing. 7c is a guide stationary blade 7
A plurality of waterway discharge ports 8 provided in the through hole 7b are annular liner rings fitted to the inner circumferential surface of the through hole 7b, and the inner circumferential surface is connected to the outer circumferential surface of the suction port 6a through a narrow gap (7). 9 is a volumetric expansion absorbing member made of an elastic O-ring fitted in an annular groove 7d provided on the outer peripheral surface of the through hole 7b of the stationary guide vane 70. is the suction pipe (
(not shown) is connected to the discharge port 4c, and a discharge pipe (not shown) is connected to the discharge port 4c.

Conventional centrifugal pumps of this type are constructed as described above, but this type of centrifugal pump is often installed outdoors, especially in the winter when the ambient temperature around the centrifugal pump is below freezing. Therefore, when the operation of the centrifugal pump is stopped and the water in pump f is in a stationary state, the impeller chamber 4a
The water in the inner and suction 1-]4b freezes, and the volume expansion of about 9% due to freezing of this water causes an abnormal load to act on the Colli pump casing 4, the bracket 1, the stationary guide vane 7, etc. Absorbing member 9 made of an elastic O-ring to prevent damage to the pump part due to abnormal loads
However, not only is it necessary to provide the absorbent member 9 on the other side, but also an annular shape 117 into which the absorbent member 9 is fitted is provided.
It is necessary to process d into the guide stationary blade 7. In addition, since the guiding stationary vane 7 is screwed to the bracket 1 with a plurality of small screws, the inner circumferential surface of the liner ring 8 and the outer circumferential surface of the suction 68 of the vane 6 are thin. It is not only difficult to match the gap value to the set value, but also requires the addition of a plurality of f1M+ internal threads and a plurality of machine screws for threaded connection. In addition, the absorbing member 9 needs to have a volume that can sufficiently absorb and contract 9% of the volume expansion of the residual water in the impeller chamber 4a and the suction 1'4b, so the volume of the absorbing member 9 is As a result, the pump casing 4 becomes large in size, which has the disadvantage of increasing the cost in addition to the above.

This invention has been made in an attempt to eliminate such drawbacks, and one example of this invention will be described with reference to FIGS. 2 to 4. In the figure, Ib is an annular projection integrally formed on one end surface of the bracket 1, 1c is four water channels formed in the annular projection 1b, and has an L1 cross section with an engaging portion 1d. The opening 1e is formed in the recessed part of the opening 1e on the side surface. 4d is pump casing 4
an annular groove formed on the outer peripheral surface of the impeller 6 side of the suction port 4b;
Reference numeral 10 denotes a guide stationary vane made of elastic synthetic resin or foamed rubber, whose inner peripheral surface is removably fitted into the annular groove 4d, and whose outer edge end surface 10a is connected to the side surface of the four water channels 1c. [4 engaging portions] obstructing the opening 1e and integrally formed on the outer edge, each having a cross-section with a roadway shape] Ob
One end surface engages with the engaging portion 1d of the waterway IC to restrict rotation of the stationary guide vane 1°. 4e is a two-circular fitting hole formed on the inner peripheral surface of the suction port 4bρ impeller 6 (ill) of the pump casing 4, and 8 is a first annular liner fitted into the fitting hole 4e of B. The inner peripheral surface of the ring faces the outer peripheral surface of the suction port 6a of the impeller 6 through a gap.

The rest of the configuration is the same as that of a conventional centrifugal pump, so a description thereof will be omitted.

In addition, in the embodiment B, the stationary guide vane 1o is provided with four engaging portions 10b, and one end surface of each engaging portion iob engages with the engaging portion 1d of each of the four water 1dles. However, the present invention is not limited to this embodiment. One engaging part Job is provided in the guide stationary vane]0, and only one engaging part Job among the four engaging parts 10b is provided. The guide stationary blades 1o may be engaged with each other to restrict rotation of the guide stationary blades 1o.

As explained above, this invention is formed of a plurality of water channels having an engaging part integrally formed on one end surface of the bracket, and an elastic closed cell, and the inner peripheral part is formed of a suction port of a pump casing. It is removably fitted to the outer peripheral surface and closes the side openings of the plurality of water channels with the end face of the outer edge, and at least one engaging part is provided on the outer edge (this is provided) and Since the structure is equipped with a stationary guide vane that engages with one engaging part, the stationary guide vane not only fully performs its original function, but also prevents water in the pump chamber and the suction port of the casing from freezing. A static IJ with a large volume is used to compensate for the volumetric expansion of the case.
There is no need to change the volume of the casing, etc., since the two-winged ridge can absorb enough water. In addition, the stationary guide vanes are detachably attached to the casing and do not need to be connected to other parts using fastening members, which not only completely prevents damage during freezing, but also allows for small and inexpensive spiral coils. It is effective to provide a pump.

[Brief explanation of drawings]

Fig. 1 is a partial sectional view of a conventional centrifugal pump, Fig. 2 is a partial sectional view showing an embodiment of the present invention, Fig. 3 is a sectional view taken along the line ■-■ in Fig. 2, and Fig. 4. 2 is a sectional view taken along line IV-IV in FIG. 2. FIG. In the figure, 1 is a bracket, 1b is an annular projection, 1c is a water channel, 1e is an opening, 1d is an engaging part, 2 is a rotor shaft, 4 is a pump casing, 4a is an impeller chamber, 4b is a suction IJ , 4 c IJ If-1: 14
1 L, , l, 4d are annular grooves, 6 is blade lf, 10 (4
In the stationary guide vane made of closed cell foam, 10a is an outer edge end surface, and 10b is an engaging portion. In addition, the same 71 bows in the figure indicate 1 or the equivalent part. Agent: Tsuyoshi Ayano - Figure 1 Figure 2 Figure J

Claims (3)

[Claims] (1) In a centrifugal pump having stationary guide vanes,
A plurality of water channels are integrally formed on one end surface of the bracket and have a tx engagement part, and are coupled to one end of the bracket and cooperate with the bracket to form an impeller chamber, and also have a suction port and a discharge port. The inner peripheral part is removably fitted to the outer peripheral surface of the suction port, and the outer peripheral part closes the side opening of the water distribution channel. (7) A centrifugal pump comprising a guide stationary vane provided on the outer edge and at least one engaging portion engaging the waterway engaging portion. (2) The centrifugal pump according to claim 1, wherein the guide stationary vanes are made of elastic foamed synthetic resin or 1' foamed rubber. (3) Patent I, Claim 1, characterized in that the plurality of water channels are a plurality of concave portions formed in a cross-sectional shape.
Whirlpool Pon-i described in Section 1.