JPS62189399A - Liquid transfer pump - Google Patents

Abstract

PURPOSE:To make it possible to withdraw liquid from an opening of a box- shaped body and to make the use of a contact type sealing device needless by shaking off the liquid leaked out from the axis through part of a casing at operation with a disc fixed to the rotating shaft inside the box-shaped body and having compact construction. CONSTITUTION:A side plate 21 is installed in a space enclosed by a horizontal partition 2C, a strut 4 and a pump discharging passage 2b so that it may surround a rotating shaft 3b piercing through a pump casing and a disc 7 fixed to it on the upper face of the pump casing 2 and a box-shaped body 22 is formed. The constitution of the lower part of this side plate 21 is so arranged that the liquid 10 which leaked out from the axis through part of an opening 21a may be shaked off by the disc 7 to return downward through the opening 21a. This liquid 10 is withdrawn downward from the gap of an adjacent strut 4 along the upper face of the casing 2. In this way, the liquid that leaked out from the axis through part of the casing 2 at operation can be steadily withdrawn with a compact construction and the use of a contact type sealing device can be made needless.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of the Invention] The present invention relates to a liquid transfer pump that is capable of recovering liquid leaking from a shaft penetrating portion of a pump casing with a compact structure.

[Prior art and its problems]

A conventional example of a liquid transfer pump will be explained based on FIG. 4.

FIG. 4 shows a multi-stage pump, in which a pump casing 2 surrounding a multi-stage impeller 1 is attached to a flange 3 of a vertical shaft motor 3.
It is integrally formed on the lower surface of the casing 2 via the support 4.
The impeller 1 is attached to the lower end of the rotating shaft 3b passing through the upper part of the
The pump is attached to the liquid storage tank 5 at a flange 3a, and a suction port 2a and a discharge passage 2b communicating with the upper side of the flange 3a are provided on the lower surface and the outer periphery of the upper end of the gauging 2, respectively. Said casing 2
A disk 6 that engages with the lower surface to perform a labyrinth action is fixed to the rotating shaft 3b in the shaft penetrating portion of the rotary shaft 3b. A disk 7.8 is fixed to the rotating shaft 3b of the support column 4 with appropriate gaps between the upper surface of the casing 2 and the lower surface of the second flange 38, and the shaft penetrating part of the flange 3a is fitted with an oil seal or the like. A contact type shaft sealing device 9 is provided.

When the pump is operated, the high-pressure liquid 10 that accompanies the transfer may leak out from the shaft penetrating portion of the gooshing 2 against the labyrinth action of the disc 6. This liquid 10 is collected in the radial direction by the lower disk 7, but most of it is recovered by the pillar 4.
A portion of the liquid 10 hitting the discharge passage 2b reaches the shaft sealing device 9 against the swinging action of the upper disc 8.

In such a structure, when trying to transfer cutting fluid etc. for a machine tool, the contact surface of the shaft sealing device 9 is abraded by cutting powder mixed in the cutting fluid, and the fluid 10 leaks from the shaft penetrating portion of the flange 3a. Furthermore, this liquid 10 may enter the bearing 3C of the motor 3 and reduce the lubricity of the bearing 3C, and to prevent this, there is a disadvantage that the shaft sealing device 9 must be frequently replaced. Ta.

[Purpose of the invention]

SUMMARY OF THE INVENTION In order to eliminate the above-mentioned drawbacks, it is an object of the present invention to provide a liquid transfer pump that is capable of recovering liquid leaking from a shaft penetrating portion of a pump casing with a compact structure.

[Key points of the invention]

In order to achieve the above-mentioned object, this invention forms a box-like body by attaching to the upper surface of a pump casing a horizontal partition wall that surrounds a rotating shaft passing through the pump casing, and a side plate having an opening at the lower part. A disk is fixed to the rotating shaft inside the box-like body, and the liquid leaking from the shaft penetrating portion of the casing is shaken off by the disk and collected from the opening of the box-like body.

[Embodiments of the invention]

FIGS. 1, 2, and 3 show embodiments of the present invention, and the same parts as in FIG. 4 are denoted by the same reference numerals.

In these figures, a horizontal partition wall 2C, a support column 4, and a pump discharge passage 2 are shown on the upper surface of the pump gauging 2 so as to surround the rotating shaft 3b passing through the pump gauging 2 and the disk 7 fixed thereto.
A side plate 21 is attached to the space surrounded by b to form a box-shaped body 22. An opening 21a is provided at the bottom of the side plate 21.
is provided so that the liquid 10 leaking from the shaft penetrating portion of the casing 2 during operation is shaken off by the disk 7 and returned downward from the opening 21a. This liquid 10 travels along the upper surface of the casing 2 and is collected downward from between the adjacent struts 4.

C Effects of the Invention] According to the present invention, in the liquid transfer pump, a box-shaped body is formed by a horizontal partition plate and a side plate so as to surround the rotating shaft passing through the upper surface of the pump casing and the disk fixed to the rotating shaft. The side plate is installed so that the lower part becomes the opening, so the structure is compact and the liquid leaking from the shaft penetration part of the casing can be reliably collected, and there is no need to use a contact type shaft sealing device. The effect is that it can be done as follows.

[Brief explanation of drawings]

Fig. 1 is a longitudinal cross-sectional view of an example of this invention, Fig. 2 is a longitudinal cross-sectional view of main parts of an embodiment, Fig. 3 is a cross-sectional view taken along the line ■-■ in Fig. 2, and Fig. 4 is a conventional FIG. 3 is a vertical cross-sectional view of an example. 2...Casing, 2b...Pump discharge path, 2c.
...Partition plate, 3...Motor, 3m...Flange, 3b
... Rotating shaft, 4... Support, 5... Tank, 7...
・Disc, 10...Liquid 7...Figure 1, Figure 2, Figure 3, Figure 4

Claims (1)

[Claims] 1) In a liquid transfer pump that includes a vertical shaft motor attached to a liquid storage tank with a flange, and a pump casing is integrally formed on the lower surface of the flange via a support, the upper surface of the casing surrounds a rotating shaft passing through it. A horizontal partition wall and a side plate with an opening at the bottom are attached to form a box-like body, and a disc is fixed to the rotating shaft inside the box-like body to prevent liquid leaking from the shaft penetration part of the casing during operation. A liquid transfer pump characterized in that the liquid is collected from an opening of a box-like body by being shaken off by the disk.