JPS5943519Y2 - pump casing - Google Patents

Description

[Detailed description of the invention] The present invention consists of a casing plate, a peripheral wall made of rubber that is fixed to the periphery of the casing plate, stands up at a certain height, has a draining section, and forms a volute chamber together with the draining section. Regarding a pump casing consisting of.

A submersible pump that integrates a motor part and a pump part [? In this case, a pump portion is formed at one end, for example, the lower end of the motor portion.

In order to suitably configure the pump section of this type of so-called motor pump, the present applicant previously proposed a rubber casing as shown in FIG.

As shown in FIG. 1, the rubber casing 1 consists of a metal casing plate 2 and a peripheral wall 3 made of vulcanized rubber that is fixed to the periphery of the metal casing plate 2 and stands upright to form a volute chamber.

The casing 1 is attached to the lower part of the motor frame 4 with bolts 5, and an impeller 6 is arranged within the peripheral wall 3 of the casing 1.

The details of the structure of the casing 1 are as shown in FIG. 2 A 9 port and FIG. 3 A 2 port, and FIG.
Figure I.

At the mouth, the peripheral wall 3 has an inwardly extending drainage section I.

However, with this configuration, the volute winding start part is far away from the impeller outer periphery, and it cannot be aligned with the flow direction of the fluid from the impeller outlet, resulting in deterioration of pump characteristics and leakage from the casing plate 2. There were drawbacks such as peeling of the drain section I.

Furthermore, if an attempt is made to forcefully fix a rubber part to a metal part using a fixing means, the rubber may be torn off, and the encased fixing means will get in the way of water flow.

Therefore, an object of the present invention is to provide a pump casing in which the rubber drainage part does not peel off, and the rubber drainage part and peripheral wall can be firmly fixed to a metal part such as the casing without being torn off. .

In the case of the pump casing according to this 4tiC, the rubber peripheral wall covers the outer peripheral surface of the casing plate, and after being fitted into the pump casing, the rubber drainage part VC has a hole for inserting a nut. and a bolt insertion hole having a smaller diameter than the nut insertion hole is drilled at the position of the casing plate corresponding to the hole, and the casing plate is fixed from the hub bolt nare l,
In addition, a reinforcing metal fitting is embedded in a rubber drainage part near the tongue part.

Since the rubber peripheral wall covers the outer periphery of the metal casing plate, no excessive force is applied to the peripheral wall, and there is no particular need for fixing means such as bolts and nuts.

Furthermore, since the reinforcing metal fittings are buried near the tongue of the draining portion, no excessive force is generated and no flow path loss occurs.

Furthermore, since the bolt insertion hole is provided with a diameter smaller than that of the nut insertion hole, the structure can be similar to that shown in FIG. 1, ensuring secure fixation of the rubber parts and eliminating flow path loss.

An embodiment of the present invention will be described below with reference to FIGS. 4A and 5.

The pump casing 11 shown in these figures KB has a casing plate 12 made of a metal plate or the like, and the casing plate 12 has a substantially triangular shape, with a suction hole 13 bored in the center.

A lower end portion of a peripheral wall 14 made of rubber is fixed to the peripheral edge of the casing plate 12, and the peripheral wall 14 rises from there at a fixed height.

A porlute chamber 15 is formed inside the peripheral wall 14 .

As can be seen from the opening in FIG. 4, a peripheral wall 14 made of rubber covers the outer peripheral surface 12a of the casing plate 12, and is fitted into the pump casing in the same manner as in FIG.

The rubber drainage part 17 has a hole 19 for inserting a nut.
The casing plate 12 corresponding to this hole 19 is provided with a bolt insertion hole 18 having a smaller diameter than the hole 19, as shown in FIG.
is fixed with bolts and nuts.

The lower ends of rod-shaped reinforcing metal fittings 16 are fixed to the draining portions of the casing plate 12 near their respective apexes by stud welding, spot welding, or the like.

A draining portion 17 extends from the peripheral wall 14, and the reinforcing metal fitting 16 is covered by the draining portion 17. In other words, the reinforcing metal fitting 16 is buried near the tongue portion 17aVC of the draining portion 17.

Further, the peripheral wall 14 and the draining portion 17 are connected to the casing plate V-)
It is preferable to fix the reinforcing metal fittings 16 to the reinforcing metal fittings 12, and to attach unvulcanized rubber to these and vulcanize them, that is, to perform rubber vulcanization molding.The reinforcing metal fittings 16 should have an appropriate shape other than a rod shape. Can be done.

The present invention is constructed as described above, and the reinforcing metal fittings 16 are embedded in the draining portion 17. This will strengthen it.

That is, as shown in FIG. 5, the pressures Pl and P2 on both sides acting on the draining part 17 have a relationship of Pl>P2, and since they are not constant pressures and fluctuate, a second
In the present invention, a large vulcanized area is required for the draining portion I shown in FIGS.
7 extends considerably longer from the peripheral wall 14 than the drain portion I in FIG. 2, and the radius of curvature can be set to a smaller radius of curvature r.

If the reinforcing metal fittings 16 are not provided and the shape is the same as that of the present invention, there is a risk that the drainage portion will deform due to the internal pressure P 1 tP 2 and come into contact with the outer periphery of the impeller.

As a result of the draining section 17 being vulcanized into a shape close to the ideal as described above, the performance of the pump casing of the present invention is higher than that of the conventional dotted line YK as shown by the solid line X in FIG. , both output was improved.

As explained above, in the present invention, by providing a reinforcing metal fitting in the drain section, the volute chamber, particularly the drain section, can be vulcanized into a shape close to the ideal, and the pump performance can be improved.

Furthermore, it is possible to prevent the draining portion from peeling off from the casing plate and to prevent damage to the draining portion.

Further, since the rubber peripheral wall covers the outer peripheral surface of the metal casing plate, no undue force is applied to the peripheral wall.

Since the draining part has reinforcing metal fittings buried near the tongue part, it can be securely fixed without applying excessive force, and there is little flow path loss.

Furthermore, the bolts and nuts for tightening can be easily fixed to the casing plate at the drainage section.

In particular, since the bolt insertion hole is provided with a smaller diameter than the nut insertion hole, the nut can be suitably accommodated.

Therefore, the life of the rubber parts is long and the pump performance is not impaired.

[Brief explanation of the drawing]

Figure 1 is a partial sectional view of a pump using the pump casing that is the basis of the present invention, Figure 2 (A) 2 ports and Figure 3 (B) 9 ports are plane views showing details of the rubber pump casing in Figure 1. Fig. 4A is a plan view and side sectional view showing an embodiment of the pump casing according to the present invention, Fig. 5 is an enlarged view of the main part of Fig. 4A, Fig. 6 is the main part of Fig. FIG. 3 is a diagram for explaining the performance of the invention. 12...Casing plate, 14...
・Peripheral wall, 16--Reinforcement metal & 17--Curved drain section, 17a--tongue, 18--hole for bolt insertion, 19--for bent nut insertion Hole.

Claims (1)

[Scope of utility model registration request] In a pump comprising a casing plate and a rubber peripheral wall that is fixed to the peripheral edge of the casing plate and stands up at a certain height and has a draining part and forms a volute chamber together with the draining part, the rubber peripheral wall covers the outer circumferential surface of the casing plate and is fitted into the pump casing, and the rubber drainage part has a hole for inserting a nut, and the hole is located at a corresponding position on the casing plate. A bolt insertion hole with a smaller diameter than the nut insertion hole is drilled, the casing plate is fixed with a bolt nut, and a reinforcing metal fitting is embedded in a rubber drainage part near the tongue part. %(i) of the pump casing.