JPH0574717B2 - - Google Patents

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 multistage pump, in which a casing cover of a pump casing 2 surrounding a multistage impeller 1 is integrally formed on the lower surface of a flange 3a of a vertical shaft motor 3 via a support 4, and penetrates through the upper part of the casing 2. The impeller 1 is attached to the lower end of the rotating shaft 3b.
is fixed. The pump is attached to the liquid storage tank 5 with a flange 3a, and has a suction port 2a and a flange 3a on the lower surface and the outer periphery of the upper end of the casing 2.
A discharge passage 2b communicating with the upper side of each is provided. A disk 6 that engages with the lower surface of the shaft penetrating portion of the casing 2 to perform a labyrinth action is attached to the rotating shaft 3.
b. Disks 7 and 8 are fixed to the rotating shaft 3b of the support column 4 with appropriate distances from the upper surface of the casing 2 and the lower surface of the flange 3a, respectively, and the shaft penetrating portion of the flange 3a is in contact with an oil seal or the like. A shaped shaft sealing device 9 is provided.

When the pump is operated, the high-pressure liquid 10 accompanying the transfer may leak from the shaft penetrating portion of the casing 2 against the labyrinth action of the disc 6. This liquid 10 is shaken off in the radial direction by the lower disk 7 and most of it is recovered, but a part of the liquid 10 that hits the column 4 and the discharge passage 2b is shaken off by the upper disk 8. It resists and reaches the shaft sealing device 9 section.

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. Further, this liquid 10 may enter the bearing 3c of the motor and reduce the lubricity of the bearing 3c, and in order to prevent this, there is a disadvantage that the shaft sealing device 9 must be replaced frequently.

[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 object, the present invention provides a liquid transfer pump including a vertical shaft motor attached to a liquid storage tank with a flange, and in which an impeller is surrounded by a pump casing below the flange and a casing cover. The struts and discharge passages to be coupled are integrally formed with a horizontal partition wall between the two, and the space between the partition walls and the casing cover is closed, and a pair of side plates spanning the struts and the discharge passages are formed between the struts and the discharge passages. A rectangular box-like body is formed by being attached to the discharge passage by a fastening means, an opening is provided in the lower part of the box-like body, and a disk is fixed to the rotating shaft inside the box-like body.

According to such a configuration, the liquid leaking from the shaft penetrating portion of the casing can be shaken off by the disk and collected from the opening of the box-shaped body, and the liquid can be prevented from leaking to the outside from the flange or entering the bearing. I won't.
Particularly in the case of a multi-stage, high-pressure pump where the rotational jetting speed of liquid leaking from the shaft penetrating part of the casing is high, the rectangular box-like body has the effect of weakening the rotary jetting speed, and the upper part of the box-like body Prevents it from ejecting upward from the shaft penetrating part. Further, the partition wall integrally molded with the pillars and the like is well suited for molding such as casting, which includes the axis and has a cut-off surface perpendicular to the pillars, and does not require a core or the like. If the side plates are also molded integrally with the partition wall, the box-like body will definitely become a core, which will significantly reduce productivity.

[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, the liquid transfer pump comprises a vertical shaft motor 3 mounted at a flange 3a on a liquid storage tank 5, below which a pump casing 2 surrounds an impeller 1. The flange 3a, the casing cover 2x of the pump casing, the strut 4 that connects these two, and the discharge passage 2b are integrally molded. The discharge passage 2b faces the support column 4 and is connected to the flange 3.
The upper side of a is communicated with the casing cover 2x.

The above structure is approximately the same as the conventional example. As a characteristic structure of the embodiment, a horizontal partition wall 2c is provided between the flange 3a and the casing cover 2x.
are integrally molded. Then, a pair of side plates 21 are bridged over the support column 4 and the discharge passage 2b so as to close the space between the partition wall 2c and the casing cover 2x, and both ends of the pair of side plates 21 are connected to the support column 4 by fastening means such as screws.
and is attached to the discharge passage 2b to form a rectangular box-like body 22. An opening 21a is provided in the lower part of this box-like body 22, and the disc 7 is fixed to the rotating shaft 3b inside the box-like body 22. In this way, the liquid 10 leaked from the shaft penetrating portion of the casing 2 during operation is removed from the disk 7.
It is designed so that it can be shaken off and returned downward through 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.

〔Effect of the invention〕

The liquid transfer pump of the present invention includes a vertical shaft motor attached to a liquid storage tank with a flange, and a pump casing below the vertical shaft motor surrounding an impeller, the flange and the casing cover, and a strut connecting the two. A discharge passage and a horizontal partition wall between the two are integrally molded, a gap between the partition wall and the casing cover is closed, and a pair of side plates spanning the pillar and the discharge passage are fastened to the pillar and the discharge passage. A rectangular box-like body is formed by attaching the disc to the rotary shaft inside the box-like body, and an opening is provided at the bottom of the box-like body.

According to such a configuration, the liquid leaking from the shaft penetrating portion of the casing can be shaken off by the disk and collected from the opening of the box-shaped body, and the liquid can be prevented from leaking to the outside from the flange or entering the bearing. It has the effect of stopping it from happening. Particularly in the case of a multi-stage, high-pressure pump where the rotational jetting speed of liquid leaking from the shaft penetrating part of the casing is high, the rectangular box-like body has the effect of weakening the rotary jetting speed, and the upper part of the box-like body This has the effect of preventing the liquid from ejecting upward from the shaft penetrating portion. Moreover, the partition wall integrally molded with the pillars and the like has the advantage that it is well suited for molding such as casting, which includes the axis and has a cutout surface perpendicular to the pillars, and does not require a core or the like.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view of an embodiment of the invention, FIG. 2 is a longitudinal sectional view of the main part of the embodiment, and FIG. 3 is a -
A cross-sectional view taken along the line, and FIG. 4 is a vertical cross-sectional view of the conventional example. 2...Casing, 2b...Pump discharge path, 2
c... Bulkhead, 2x... Casing cover, 3...
Motor, 3a...flange, 3b...rotating shaft, 4
...Strut, 5...Tank, 7...Disc, 10...
Liquid, 21... Side plate, 21a... Opening, 22...
...Box-shaped body.

Claims (1)

[Claims] 1. In a liquid transfer pump that is equipped with a vertical shaft motor attached to a liquid storage tank with a flange, and in which an impeller is surrounded by a pump casing below, the flange and the casing cover, the strut and discharge passage that connect the two, and the space between the two. A rectangular box is formed by integrally molding a horizontal partition wall, and a pair of side plates that close the space between the partition wall and the casing cover, and span the pillars and the discharge passage, are attached to the pillars and the discharge passage by fastening means. 1. A liquid transfer pump characterized in that a box-shaped body is formed, an opening is provided at a lower part of the box-shaped body, and a disk is fixed to a rotating shaft inside the box-shaped body.