JP2000320486A - Electric pump for relay - Google Patents

Abstract

(57) [Summary] [Object] To provide a relay electric pump in which the pressure in a spiral chamber is released without discharging pressurized water to the outside and the shaft sealing function in an oil chamber is not impaired. [Structure] From the end portion 1e of the winding of the spiral chamber 1 to the oil chamber peripheral wall 1
The end of the water conduit 13 extending along the inner surface of the annular channel 4 is connected to the beginning of the annular water channel 12 and the terminal of the annular water channel 12 is connected to the pump discharge port.
And a relief hole formed along the peripheral wall 16 of the volute chamber, and a hole 17 extending radially from the periphery of the shaft hole 18 formed in the center of the partition body 9 that defines A return water passage 21 communicating from the hole 15 to the pump suction port 4 is provided therein, and a connection mechanism 20 is attached to a distal end portion of a connection pipe 22 extending away from the open end of the pump suction port 4.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a relay electric pump.

[0002]

2. Description of the Related Art As is well known, in an electric pump used underwater, in order to prevent the pressure generated in the spiral chamber from being transmitted to the oil chamber when the pump is driven, the shaft sealing function is prevented from being impaired. A structure is used in which the pressure inside the spiral chamber is released. However, in a relay electric pump often used on land, it is not preferable that water discharged from the depressurizing portion leaks and scatters to the outside.

[0003] Therefore, the relay electric pump has a structure in which the pressure inside the volute chamber is not released during driving, and the pressure acting on the shaft sealing portion is reduced to the water supply pressure supplied from the preceding stage.
When the pumping pressure generated by the relay pump itself is increased, the shaft sealing function is impaired.

[0004]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a relay electric pump in which the pressure in a spiral chamber is released without discharging pressurized water to the outside and the shaft sealing function in an oil chamber is not impaired. is there.

[0005]

In the relay electric pump according to the present invention, the terminal end of the headrace extending from the terminal end of the spiral chamber along the inner surface of the peripheral wall of the oil chamber is connected to the start end of the annular channel described later. At the same time, the end of the annular water passage formed between the opposing surfaces of the motor frame and the out cover is conducted to the pump discharge port, and the pump shaft is inserted through the center of the partition that separates the spiral chamber and the oil chamber. A shaft hole is bored, and a bore hole radially extended from the periphery of the shaft hole is bored, and the starting end of the relief hole bored along the peripheral wall of the volute chamber is set at the end of the bore hole. A connecting pipe extending from the opening end of the pump suction port and having a return water passage extending from the relief hole to the pump suction port by connecting the annular base to the end of the spiral chamber peripheral wall. A coupling mechanism was attached to the tip of the body.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The embodiments will be described below with reference to the drawings.

[0007] 1 is a spiral chamber, 2 is an impeller fitted in a lead-out end of a pump shaft 3 and accommodated in the spiral chamber 1, 4 is a pump suction hole formed in a central portion of a spiral chamber outer wall 5. , 7 is the spiral chamber 1
And an oil chamber interposed between the motor frame 8 and the oil chamber. The oil chamber is connected to the spiral chamber 1 through a partition 9. 10
Is a shaft sealing device provided in the oil chamber 7. An outer cover 11 is provided around the outer periphery of the motor frame 8 adjacent to the oil chamber 7, and an annular water passage 12 is formed between the opposing surfaces of the both 8, 11. 13 is the end portion 1 of the spiral in the spiral chamber 1
e, a water conduit extending along the inner surface of the oil chamber peripheral wall 14, and one surface of the pipe wall is integrally connected in such a manner as to constitute a part of the oil chamber peripheral wall 14, and the other of the pipe wall is The surface is formed so as to be in direct contact with the lubricating oil in the oil chamber 7, and the terminal end thereof communicates with the start end of the annular water passage 12. The end of the annular water channel 12 communicates with a pump discharge port (not shown). Reference numeral 15 denotes a relief hole formed along the spiral chamber peripheral wall 16. A shaft hole 18 into which the pump shaft 3 is vertically inserted is bored in the center of the partition body 9, and a cutout hole 17 extending radially from the periphery of the shaft hole 18 is bored in the partition body 9. The terminal end is electrically connected to the starting end of the escape hole 15. The drawing of the embodiment shows an example of a mating structure in which when a plate body 9a facing the spiral chamber 1 and a plate body 9b facing the oil chamber 7 are connected in a back-to-back shape, a hole 17 is formed in the connection surface. Is shown, but one side is a spiral chamber 1
And the other surface may face the oil chamber 7 in a single plate structure. The point is that the spiral chamber 1 and the oil chamber 7 are separated from each other, and the terminal end of the hole 17 extending from the periphery of the shaft hole 18 may be electrically connected to the start end of the relief hole 15. Reference numeral 19 denotes a suction adapter in which an annular base is connected to an end of the spiral chamber peripheral wall 16 and a connecting mechanism 20 is attached to a tubular tip end thereof. The connecting pipe 22 extends from the open end of the pump suction port 4. In the drawings of the embodiment, the coupling mechanism 20 has a coupling structure in which a connection bolt insertion hole is formed in a flange extending around the outer periphery of the distal end portion of the connection pipe 22. However, this structure is not necessarily required. However, it is a matter of course that other pipe joint structures may be adopted. The headrace 13
It is desirable that members related to the water cooling action such as the oil chamber peripheral wall 14 be made of a heat conductive material such as a metal.

[0008]

According to the aspect in which the connecting pipe 22 is connected to the water supply pipe extending from the discharge port of the pre-installed pump, the water sucked from the pump suction port 4 into the volute 1 when the pump is driven.
The lubricating oil is cooled in the process of passing through the water conduit 13 in the oil chamber 7 from the end portion 1e of the winding, and is discharged from the pump discharge port while absorbing heat generated by the motor in the process of passing through the annular water channel 12 in the out cover 11. Then, water is supplied to a downstream pump by a water supply pipe extending from the pump discharge port. The spiral chamber 1
A part of the water in the inner space flows through the pump shaft 3 or the protective sleeve S from the back of the blade, flows into the extraction hole 17 from the hole edge of the shaft hole 18, and is further reduced into the suction adapter 19 through the escape hole 15. Thus, the pressure generated in the volute 1 does not propagate into the oil chamber 7. Then, the water reduced from the escape hole 15 passes through the return water passage 21 and is sucked into the spiral chamber 1 again from the pump suction port 4.

[0009]

According to the relay electric pump of the present invention, the pressure in the spiral chamber is released without discharging the pressurized water to the outside, and the pressure generated in the spiral chamber does not propagate to the oil chamber. This has the advantage that the shaft sealing function in the oil chamber is not impaired.

[Brief description of the drawings]

FIG. 1 is a vertical sectional side view of a main part of an electric pump for relay of the present invention.

FIG. 2 is a longitudinal sectional side view in a case where a partition body used in the electric pump for relay of the present invention is composed of two members, a plate body facing a volute chamber and a plate body facing an oil chamber.

FIG. 3 is an end view of the casing of the oil chamber, to which the partition body constituting plate according to the embodiment of FIG. 2 is fitted, as viewed from the plate body fitting side;

4 is an end view of the swirl chamber forming casing to which the partition forming plate according to the embodiment of FIG. 2 is fitted, as viewed from the plate fitting side;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Spiral chamber 1e End of winding 3 Pump shaft 4 Pump suction port 7 Oil chamber 8 Motor frame 9 Partition plate 11 Out cover 12 Annular water channel 13 Water channel 14 Oil chamber peripheral wall 15 Relief hole 16 Spiral chamber peripheral wall 17 Drill hole 18 Shaft hole Reference Signs List 20 connection mechanism 21 return waterway 22 connection pipe

Claims (1)

[Claims] 1. An end portion of a water guide channel extending from an end portion of a winding of a spiral chamber along an inner surface of a peripheral wall of an oil chamber to a start end portion of an annular water channel to be described later, and a facing surface between a motor frame and an out cover. The end of the annular water passage formed therebetween is connected to the pump discharge port, and a shaft hole through which the pump shaft is inserted is formed at the center of the partition that separates the spiral chamber and the oil chamber. A perforation hole extending radially from the perimeter of the hole is bored, and the starting end of the relief hole perforated along the perimeter wall of the volute chamber is connected to the end of the perforation hole, and the annular base is connected to the volute chamber. A return passage connected to the end of the peripheral wall and leading from the relief hole to the pump suction port, and a connection mechanism attached to a distal end of the connection pipe extending away from the open end of the pump suction port; A relay electric pump characterized by the above-mentioned.