JPH077593Y2 - Anti-rust structure for submersible pump motor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a rust preventive structure for a motor for a submersible pump.

[Conventional technology]

As a generally used submersible pump at present, there is a submersible pump in which a pump casing and an impeller are molded from plastic, and a submersible motor is fixed thereon to drive the impeller.

[Problems to be solved by the device]

As mentioned above, the plastic submersible pump is resistant to rust, but even if the motor casing can be made partly plastic, most of its bearings etc. must be made of iron or aluminum. Therefore, there is a problem of red rust in the case of iron and white rust in the case of aluminum.

Especially in recent years, the quality of water has deteriorated, and there is a demand for a submersible pump that can also be used for seawater. Therefore, a problem may occur in the conventional motor.

The problem of this invention is to solve the above problems, and to improve the motor in particular, to provide an inexpensive rustproof structure for a motor for submersible pumps that is resistant to rust and has a large cooling effect. Is to provide.

[Means for Solving the Problems]

In order to solve the above-mentioned problems, the present invention covers the outer peripheral surface of a vertical motor case fixed on the casing of a submersible pump with a stainless steel cylinder, and the upper and lower ends of the stainless steel cylinder are below the head cover and above the pump casing. Close to
Provided is a rust preventive structure for a motor for a submersible pump, wherein an annular packing is embedded in an annular space between the upper and lower outer peripheral slopes of the motor case and the upper and lower inner peripherals of a stainless steel cylinder.

[Action]

When a submersible pump using a motor embodying this invention is put into water and the impeller is driven by the motor, the water sucked into the casing from the suction port of the pump casing swirls inside the casing and is discharged from the discharge port by centrifugal force. It goes out and goes up in the pumping pipe connected to the outlet.

As described above, the motor of the submersible pump placed in water is in direct contact with the stainless steel cylinder on the outside, but an annular packing bites between the inner circumference of the upper and lower ends of the stainless steel cylinder and the outer circumference of the upper and lower ends of the motor case. In this state, water is prevented from penetrating between the stainless steel cylinder and the motor case, so there is no risk of rust occurring in the motor case even when the water is poured into poor quality water or seawater.

〔Example〕

In the embodiment shown in FIGS. 1 and 2, 1 is a pump casing, 2 is a vertical motor fixed to the upper portion thereof, and 3 is a motor case.

Further, the shaft 6 of the motor 2 penetrates the mechanical seal 5 below the bearing 4 and enters the casing 1, and an impeller 7 is fixed to the lower end thereof.

A suction port 10 is provided at the center of the lower part of the casing 1, and a discharge port 11 is provided at a part of the outer periphery of the upper part, and a pumping pipe (not shown) is connected to the discharge port 11.

Reference numeral 12 is a ring-shaped pump base that is bolted to the lower part of the casing 1, and a porous bottom plate 13 is attached to the inside thereof, and a cylindrical body having a large number of through holes 14 between the pump base 12 and the casing 1.
15 is fixed.

A head cover 16 is bolted to the upper end of the motor case 3.

Reference numeral 17 denotes a stainless steel cylinder which is closely attached to the outer peripheral surface of the motor case, and the cylinder 17 is made of stainless steel or a non-rust metal such as titanium.

The upper end of the stainless steel cylinder 17 is fitted in the annular groove 19 on the outer circumference of the lower surface of the head cover 16, and the lower end of the stainless steel cylinder 17 is fitted inside the annular projection 20 on the upper outer circumference of the casing 1.

The motor case 3 is made of an iron casting, an aluminum casting, an iron plate, or the like, and has upper and lower end outer circumferences with slopes 21 and 22.

Therefore, the inner circumference of the upper and lower ends of the stainless steel cylinder 17 and the slopes 21, 22
An annular space with a triangular cross-section is formed between the two, but at the time of assembly, annular packings 23 and 24 such as O-rings are fitted in this space so that the space between the outer peripheral surface of the motor case 3 and the inner peripheral surface of the stainless steel cylinder 17 is separated. Be completely watertight.

The pump casing 1, the impeller 7, etc. are made of a non-rust material such as plastic.

In the case of the above-described embodiment, the rotation of the impeller 7 by the motor 2 causes the water sucked into the casing 1 from the suction port 10 to swirl inside the casing 1 and to flow from the discharge port 11 to the pumping pipe by centrifugal force.

[Effect of device]

This invention covers the outer peripheral surface of the vertical motor case of the submersible pump with a stainless steel cylinder, and the upper and lower ends of the stainless steel cylinder are brought into close contact with the lower side of the head cover and the upper side of the pump casing.
Since water is not in contact with the outer peripheral surface of the motor case by inserting an annular packing in the annular space between the upper and lower outer peripheral slopes of the motor case and the upper and lower inner peripheral surfaces of the stainless steel cylinder, the motor case Even if a material that easily rusts, such as iron or aluminum, is used as the material of, the motor case is not rusted.

In addition, the motor case is made of an inexpensive material such as iron or aluminum and has sufficient strength as described above, and the stainless steel tube is made of a thin material, so that the strength is sufficient and inexpensive, and the heat dissipation effect is not impaired. A rust preventive effect can be obtained.

[Brief description of drawings]

FIG. 1 is a vertical sectional front view of a main part of a submersible pump using this invention, and FIG. 2 is an enlarged vertical sectional front view showing a part of a motor case of the same. 1 ... Pump casing, 2 ... Vertical motor, 3 ... Motor case, 17 ... Stainless steel cylinder, 19 ... Annular groove, 20 ...
… Annular protrusions, 21, 22 …… Slopes, 23, 24 …… Annular packing.

Claims (1)

[Scope of utility model registration request] 1. A vertical motor case fixed on the casing of a submersible pump is covered with a stainless steel cylinder, and the upper and lower ends of the stainless steel cylinder are brought into close contact with the lower side of the head cover and the upper side of the pump casing. A rustproof structure for the motor for submersible pumps, with an annular packing embedded in the annular space between the upper and lower outer perimeter slopes and the stainless steel cylinder upper and lower inner perimeters.