JP2000227089A - Vertical submerged motor-driven pump - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vertical submerged motor-driven pump in which cooling function of oil is not spoiled even in the case of a seal plate covered with rubber, deformation due to water pressure is not generated even in the case of making the pump casing out of rubber, and it is unnecessary to fall sideways at oil feeding. SOLUTION: A reinforcing wall 10 is led down from the peripheral part of a seal plate 8 fixed to a pump casing 1 made of rubber from the back, it is brought in contact with the outer circumference of the pump casing 1, and on the outer circumferential face of a cylindrical motor frame 11 standingly provided on the pump casing 1 through the seal plate 8, a water passage 14 of which the lower end part is communicated to the scroll chamber 2 in a pump easing 1 and the upper end part is communicated to a pump discharge port 19, and a second oil chamber 15 of which the lower end part is communicated to a first oil chamber 22 on the peripheral part of a mechanical seal 21 and the upper end part is communicated to an oil feed port 23 on the upper part of the motor frame 11, are vertically provided in a row in the circumferential direction.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

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

[0002]

[Prior art and its problems] Vertical type submersible electric pumps
As shown in FIG. 9, an oil casing 100 is superimposed on a pump casing 101 via a rear liner 108, and a motor frame 111 is erected thereon. Cooling of the lubricating oil is performed by pumping. However, if the rubber coating 109 is applied to the rear liner 108 in contact with the oil chamber 122 in order to maintain abrasion resistance, the oil cooling function is impaired. Further, when the pump casing 101 is made of rubber, it is necessary to reinforce the pump casing 101 by increasing the wall thickness in order to prevent deformation due to water pressure, which results in an unnecessary increase in volume. Furthermore, since the opening position of the oil supply port 123 is limited to the side surface of the oil chamber 122, there is an inconvenience that the pump has to be turned over when refueling.

[0003]

SUMMARY OF THE INVENTION It is an object of the present invention to prevent the oil cooling function from being impaired even when a rubber coating is applied to a seal plate, and to prevent the pump casing from being made of rubber without an unnecessary increase in volume. An object of the present invention is to provide a vertical submersible electric pump that can prevent deformation due to water pressure and does not need to be turned over when refueling.

[0004]

In the vertical submersible electric pump according to the present invention,
The seal plate is fixed from the back of the pump casing, which is formed of a wear-resistant elastic material such as rubber and the inside is formed in a spiral chamber, and the reinforcing wall guided from the peripheral portion of the seal plate is wound around the pump casing. A water passage whose lower end communicates with the spiral chamber in the pump casing and whose upper end communicates with the pump discharge port on the outer peripheral surface of the cylindrical motor frame which is abutted on the outer periphery of the pump casing via the seal plate. And a second oil chamber whose lower end communicates with the first oil chamber around the mechanical seal and whose upper end communicates with the oil supply port above the motor frame are vertically arranged in parallel in the circumferential direction. When a plurality of water passages are vertically provided on the outer peripheral surface of the cylindrical motor frame, the upper ends of the water passages are merged at the upper side periphery of the cylindrical motor frame and communicate with the pump discharge port.

[0005]

BRIEF DESCRIPTION OF THE DRAWINGS FIG.

Reference numeral 1 denotes a pump casing made of a wear-resistant elastic material such as rubber, and the inside thereof is formed in a spiral chamber 2. Reference numeral 3 denotes an impeller fitted to the lower guide portion of the motor shaft 4 and housed in the pump casing 1. Reference numeral 5 denotes a suction cover fixed to the lower edge of the pump casing 1 and having a pump suction port 6 opened at the center. 7 is a strainer, 8 is a seal plate fixed to the back of the pump casing 1, 9 is a protective sheet made of a wear-resistant material and attached to the lower surface of the seal plate 8, 10 is a pump casing 1 which is moved outward by water pressure The reinforcing wall is a reinforcing wall for preventing deformation, and is guided down from a peripheral portion of the seal plate 8 and abuts on the outer periphery of the winding of the pump casing 1. Then, the lower end surface of the seal plate 8 and the lower end surface of the pump casing 1 are formed in a torch shape, and the suction cover 5 is brought into contact with the torch surface to tighten bolts at important points. Since the perforated reinforcing wall 10 is located on the outer periphery of the pump casing 1, it is easy to position the bolt when tightening the bolt, and the lower end surface of the reinforcing wall 10 also plays a role of tightening. It is convenient. Reference numeral 11 denotes a cylindrical motor frame which stands upright on the seal plate 8 of the pump casing 1, and its upper end face is closed by mounting a head cover 12 or the like, and a motor 13 is accommodated therein. On the outer peripheral surface of the motor frame 11, a second oil chamber 15 and an electrical equipment chamber 16 are vertically arranged in a circumferential direction in parallel with a water channel 14 extending in the cylinder axis direction.
Reference numerals 17... 17 denote partition walls for partitioning the respective chambers. The end portion 2E of the spiral in the spiral chamber 2 communicates with the lower end of the water passage 14, and the upper end of the water passage 14 communicates with the pump discharge port 19 via a guide passage 18 formed in the inner peripheral portion of the head cover 12. As shown in the drawings of the embodiment, two waterways 14,
Are disposed in opposition to each other, and the lower ends thereof are respectively electrically connected to the ends 2E, 2E of the windings of the double spiral chamber 2, respectively. And joins to the pump discharge port 19 through the guide path 18 in the inside. The second oil chamber 15 is provided vertically so as to be narrowed between the water channels 14, 14 via a partition 17.
The lower end communicates with the first oil chamber 22 formed in the periphery of the mechanical seal 21 through the oil hole 20 formed in the lower part of the motor frame 11, and the upper end opens from the upper surface of the head cover 12. To the filled fuel supply port 23. Reference numeral 24 denotes an oil supply plug provided to the oil supply port 23. The electrical equipment room 16 is provided with a lead wire outlet hole 25 provided on the inner surface thereof.
And the upper end surface thereof communicates with the power cable insertion port 26 above the motor frame 11.

[0007]

When the pump is driven, the water sucked into the swirl chamber 2 from the pump suction port 6 rises in the water passage 14 from the end portion 2E of the winding while the motor 13 and the second oil chamber 15 in the motor frame 11 are moving up. Guideway 1 while cooling the lubricating oil inside
The liquid is discharged from the pump discharge port 19 through 8.

[0008]

According to the vertical submersible electric pump of the present invention,
Since the second oil chamber is vertically arranged in parallel with the water channel using the outer peripheral space of the motor frame, the cooling effect of the lubricating oil by pumping is enhanced, and the lower surface of the seal plate has abrasion resistance. Even when the protective sheet is attached, the oil cooling function is not impaired at all, and the life of the shaft sealing device can be extended. Also, even if the pump casing is made of rubber, it is protected by the reinforcing wall,
Even if it is made thin, it does not deform due to water pressure. Furthermore, since the refueling port is opened from the upper portion of the motor frame, there is an advantage that it is not necessary to turn the pump over when refueling.

[Brief description of the drawings]

FIG. 1 is a vertical sectional side view of a portion of a vertical submersible electric pump according to the present invention in which a water channel and a second oil chamber are displayed.

FIG. 2 is a vertical sectional side view of a portion of the vertical submersible electric pump according to the present invention in which a water channel and an electrical equipment room are displayed.

FIG. 3 is a plan view of a motor frame of the vertical submersible electric pump according to the present invention.

FIG. 4 is a bottom view of a motor frame in the vertical submersible electric pump according to the present invention.

FIG. 5 is a vertical sectional side view taken along line AA of FIG. 3;

FIG. 6 is a longitudinal sectional side view taken along line BB of FIG. 3;

FIG. 7 is a bottom view of a head cover for closing an upper end surface of the motor frame shown in FIGS. 3 to 6;

FIG. 8 is a cross-sectional plan view taken along line CC of FIG.

FIG. 9 is a vertical sectional side view of a conventional vertical submersible electric pump.

[Explanation of symbols]

 Reference Signs List 1 pump casing 2 spiral chamber 8 seal plate 10 reinforcing wall 11 motor frame 14 water passage 15 second oil chamber 19 pump discharge port 21 mechanical seal 22 first oil chamber 23 oil supply port 26 power cable insertion port

Claims (2)

[Claims] 1. A seal plate is fixed from the back of a pump casing formed inside a spiral chamber by being molded from a wear-resistant elastic material such as rubber, and a reinforcing wall guided from a peripheral portion of the seal plate is fixed. The outer peripheral surface of the cylindrical motor frame which is brought into contact with the outer periphery of the winding of the pump casing and is erected on the pump casing via a seal plate,
A water passage whose lower end communicates with the spiral chamber in the pump casing and whose upper end communicates with the pump discharge port, and whose lower end communicates with the first oil chamber around the mechanical seal and whose upper end communicates with the oil supply opening above the motor frame. A vertical submersible electric pump characterized in that two oil chambers are vertically installed in parallel in the circumferential direction. 2. A structure in which a plurality of water passages are provided vertically on an outer peripheral surface of the cylindrical motor frame, and upper ends of the water passages merge at an upper side periphery of the cylindrical motor frame to communicate with a pump discharge port. The vertical submersible electric pump according to claim 1, characterized in that: