JP4596576B2 - All-round water submersible electric pump - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an all-around water channel type submersible electric pump.
[0002]
[Prior art and its problems]
In an oil bath type submersible electric pump, generally, as shown in FIG. 5, a lower portion of the oil chamber 107 is formed with a small diameter so as to approach the pump shaft 103 as a means for avoiding the pumping pressure directly acting on the shaft seal device. The pump shaft 103 is partly exposed, and pressure is released from the part directly to the outside. Therefore, the water discharged from the pressure relief part will be scattered outside, and the pump peripheral part will be contaminated with muddy water during low water level operation. In addition, as described above, in relation to the lower part of the oil chamber 107 having a small diameter and a shape close to the pump shaft 103, the water conduit 113 led from the end portion 101 e of the winding of the spiral chamber 101 is oil. The water level is lower than that of the lower wall 109 of the oil chamber because it has an independent pipe structure standing outside the chamber 107 and a space G that is isolated from the oil chamber 107 is formed. When the water level is reached, the means for cooling the lubricating oil is completely lost.
[0003]
OBJECT OF THE INVENTION
The purpose of the present invention is to perform pressure relief when the pump is driven without polluting the periphery of the pump with muddy water even at low water levels, and at the low water level, an effective cooling effect of the lubricating oil can be obtained by pumping water. It is to provide an all-around water channel type submersible electric pump.
[0004]
[Structure of the invention]
In the all-round water channel type submersible electric pump according to the present invention, the upper end portion of the tubular water channel led from the terminal end of the spiral chamber along the inner surface of the oil chamber side wall is conducted to the lower end of the annular water channel described later. The upper end of the annular water channel formed between the opposed surfaces of the motor frame and the outer cover is connected to the pump discharge port to partition the spiral chamber that houses the impeller and the oil chamber that houses the shaft seal device , A shaft hole that forms the upper wall of the swirl chamber and is superposed on the upper surface of the lower plate body in which the tubular water channel, the shaft hole, and the fistula are formed, and forms the lower wall of the oil chamber and is formed in the center portion. A partition plate formed by superposition with the lower surface of the upper plate body, which has a concave groove extending in the radial direction to the opening of the end portion and forming a horizontal hole by superposition with the upper surface of the lower plate body At the center portion of the cast guide the radial direction from the hole periphery of the vertical interpolated by the axial bore of the pump shaft Holes are formed, the upper end of the vertical hole communicating with the lower surface opening shape in strainer to the intake inlet communicates with the outside surrounds the pump suction port along a swirl chamber sidewall, the opening of the end portion of the transverse bore And a pressure relief channel that passes through the spiral chamber side wall is formed.
[0005]
【Example】
Hereinafter, description will be made with reference to the drawings of the embodiments.
[0006]
1 is a spiral chamber, 2 is an impeller fitted in the lower end portion of the pump shaft 3 and accommodated in the spiral chamber 1, 4 is a pump suction port drilled in the central portion of the lower wall 5 of the spiral chamber, A strainer that surrounds the pump suction port 5 and communicates with the outside and flows in water, and 7 is an oil chamber interposed between the spiral chamber 1 and the motor frame 8, and is placed on the spiral chamber 1 via the partition plate 9. Are combined. A shaft seal device 10 is provided in the oil chamber 7. An out cover 11 is provided on the outer periphery of the motor frame 8 erected on the spiral chamber 1 via the oil chamber 7, and an annular water channel 12 is formed between the opposing surfaces of the both 8 and 11. Reference numeral 13 denotes a tubular water conduit that is guided along the inner surface of the oil chamber side wall 14 from the winding end portion 1 e in the spiral chamber 1, and an aspect in which one surface of the tube wall constitutes a part of the oil chamber side wall 14. The other surface of the pipe wall is erected so as to be in direct contact with the lubricating oil in the oil chamber 7, and its upper end portion is electrically connected to the lower end portion of the annular water channel 12. The upper end portion of the annular water channel 12 communicates with a pump discharge port (not shown). Reference numeral 15 denotes a fistula formed in the shape of an opening on the lower surface along the spiral chamber side wall 16. A shaft hole 18 into which the pump shaft 3 is vertically inserted is formed at the center of the partition plate 9, and a lateral hole 17 is formed in the partition plate 9 that extends radially from the periphery of the shaft hole 18. The opening at the end of the lateral hole 17 is formed so as to conduct to the upper end of the hole 15. In the drawing of the embodiment, when the lower plate body 9a constituting the upper wall of the spiral chamber 1 and the upper plate body 9b constituting the lower wall of the oil chamber 7 are superposed, a lateral hole 17 is formed on the joint surface. Although an example of the mating structure is shown, a single plate structure in which the upper surface is the lower wall upper surface of the oil chamber 7 and the lower surface is the upper wall lower surface of the spiral chamber 1 may be used. The point is that the spiral chamber 1 and the oil chamber 7 are divided into upper and lower portions , and the opening at the terminal end of the lateral hole 17 led from the peripheral portion of the shaft hole 18 may be conducted to the upper end portion of the pothole 15. . As a result, the pressure relief from the back of the blade in the spiral chamber 1 through the pump shaft 3 or the protective sleeve S to the side hole 17 from the peripheral portion of the shaft hole 18 and further to the lower side of the spiral chamber side wall 16 through the hole 15. The water channel is configured to communicate with the inside of the strainer 6 in the form of a lower surface opening. It should be noted that members related to the water cooling action such as the tubular water conduit 13 and the oil chamber side wall 14 are made of a heat conductive material such as metal.
[0007]
[Action]
When the pump is driven, the water sucked into the spiral chamber 1 from the pump suction port 4 cools the lubricating oil in the process of passing through the tubular water conduit 13 in the oil chamber from the end portion 1e of the winding, and the annular in the out cover 11 In the process of ascending the water channel 12, the motor heat is absorbed and discharged from the pump discharge port. And the said cooling effect | action by pumping functions effectively as much as possible water absorption from the pump suction inlet 4. FIG. That is, the cooling effect of the lubricating oil and the motor is maintained even in the ultra-low water level state where the oil chamber side wall 14 and the spiral chamber side wall 16 are exposed on the water surface. Further, a part of the water in the spiral chamber 1 flows along the pump shaft 3 or the protective sleeve S from the back of the blade, flows into the lateral hole 17 from the hole edge of the shaft hole 18, and further passes through the hole 15 to form the side wall 16 of the spiral chamber. The pressure generated in the swirl chamber 1 is not propagated into the oil chamber 7 by being discharged from the depressurized water passage that goes downward, and the strainer is not discharged toward the outer side. 6 is discharged below the water surface.
[0008]
【The invention's effect】
According to the all-around-water-type submersible electric pump of the present invention, since the discharge of the pumped water when the pump is driven is discharged below the water surface without being directed toward the outer side, the peripheral portion of the pump can be removed even during low water level operation. There is no such thing as muddy water. In addition, since the tubular water conduit is led through the oil chamber and the tube wall is in direct contact with the lubricating oil, the cooling effect of the lubricating oil by pumping is extremely high, and the oil chamber side wall and the swirl chamber side wall are exposed on the water surface. Even in the ultra-low water level state, there is an advantage that the cooling effect of the lubricating oil by pumping is maintained, and the effect also affects the heat generation absorption of the motor.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional side view of a main part of an all-around water channel submersible electric pump of the present invention.
FIG. 2 is a longitudinal side view showing a state in which a partition plate interposed between a spiral chamber and an oil chamber is vertically divided in the all-around water channel submersible electric pump of the present invention.
FIG. 3 is a bottom view of a casing that constitutes an oil chamber in the all-around-water-type submersible electric pump of the present invention, and shows a state in which an upper half plate body of a partition plate is fitted to a lower surface opening.
FIG. 4 is a plan view of a casing constituting a spiral chamber in an all-around water submersible electric pump of the present invention, showing a state in which a lower half plate body of a partition plate is fitted to an upper surface opening.
FIG. 5 is a vertical sectional side view of a main part of a conventional all-around hydroelectric pump.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Spiral chamber 1e End part of winding 2 Impeller 3 Pump shaft 5 Pump suction port 6 Strainer 7 Oil chamber 8 Motor frame 9 Partition plate
9a Lower plate
9b Upper plate body 10 Shaft seal device 11 Out cover 12 Annular water channel 13 Tubular water channel 14 Oil chamber side wall 15 Bore hole 16 Swirl chamber side wall 17 Horizontal hole 18 Shaft hole

Claims (1)

The upper end portion of the tubular water conduit that is guided along the inner surface of the oil chamber side wall from the end portion of the spiral chamber winding is connected to the lower end portion of the annular water passage, which is formed between the opposing surfaces of the motor frame and the outer cover. The upper end of the annular water channel is connected to the pump discharge port, and the upper wall of the spiral chamber is configured to partition the spiral chamber that houses the impeller and the oil chamber that houses the shaft seal device. And is superposed on the upper surface of the lower plate body in which the fistula is drilled, and extends from the axial hole drilled in the central portion constituting the lower wall of the oil chamber to the opening of the terminal portion in the radial direction, shaft hole concave groove in the center of the partition plate formed by polymerization of the lower surface of the engraved by an upper plate member, which is inserted a vertical pump shaft for forming a lateral bore by polymerization of the upper surface of the lower plate member are lateral hole to be cast guide from the hole periphery the radial direction formed, pump inlet along the swirl chamber sidewall The upper end of the vertical hole communicating with the lower surface opening shape surrounding to the strainer to the intake flow into communication with the outside, the depressurization waterway passing by conduction to the opening end portion of the transverse bore below the said volute chamber sidewall characterized in that is constituted, the entire periphery waterway submersible electric pump.

Images