JP4503722B2 - Vertical submersible electric pump - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a vertical submersible electric pump.
[0002]
[Prior art and its problems]
Conventionally, the vertical submersible electric pump has an oil chamber 122 interposed between the swirl chamber 102 and the motor 113 as shown in FIG. Since the pressure difference increases, the pumped water may enter the oil chamber 122 through the sliding surface of the mechanical seal 121. In addition, when oil is supplied into the oil chamber 122, the amount of oil due to thermal expansion is anticipated and the amount of oil is normally limited to about 80%. Therefore, an air reservoir A is formed above the oil chamber 122, and a mechanical seal In the upper part of 121, lubrication failure occurs.
[0003]
OBJECT OF THE INVENTION
An object of the present invention is to provide a vertical submersible electric pump that does not cause a liquid leakage from a spiral chamber to an oil chamber and that does not cause poor lubrication of a mechanical seal.
[0004]
[Structure of the invention]
In Vertical water electric pump according to the present invention, an oil of thermal expansion for the mechanical seal lubrication, in order to counteract the pressure difference between the swirl chamber and the oil chamber that occurs during the pump drive with to absorb the increase in oil volume A second oil chamber, which is made of a hollow elastic material, is connected and integrated through an oil passage hole drilled outward from a lower portion of the first oil chamber in which a mechanical seal is installed. A motor frame is installed in the oil chamber so that the hollow interior of the oil chamber communicates with the spiral chamber in the pump casing so as to surround the first oil chamber standing on the seal plate of the pump casing . on the outer peripheral surface, housing the motor in the motor frame part which is Tate設in parallel form the second oil chamber and the machine room adjacent to the water channel to be distracted to the tube axis direction to the circumferential direction And the upper end portion of the motor frame is FutaSo by the head cover.
[0005]
[Action]
As the oil enclosed in the oil chamber is fully expanded with the oil chamber expanded, the oil chamber gradually contracts as the volume increases due to thermal expansion, and the effective volume of the oil chamber increases, and the temperature decreases. As the oil volume decreases, the oil chamber gradually expands to reduce the effective volume of the oil chamber, and the oil in the oil chamber is always kept reaching the upper part of the mechanical seal. Further, the pressure difference between the spiral chamber and the oil chamber generated during the driving of the pump is reduced by the oil chamber.
[0006]
【Example】
Embodiments of the present invention will be described below with reference to the drawings.
[0007]
Reference numeral 1 denotes a pump casing made of a wear-resistant material such as rubber, and the inside is formed in a spiral chamber 2. 3 is an impeller that is fitted in the lower part of the motor shaft 4 and accommodated in the pump casing 1, 5 is a suction cover that is fixed to the lower edge of the pump casing 1 and has a pump suction port 6 opened in 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, and 10 is a pump casing 1 that is moved outward by water pressure. It is a reinforcing wall for preventing deformation, is guided from the peripheral portion of the seal plate 8 and abuts on the outer periphery of the winding of the pump casing 1. Reference numeral 11 denotes a cylindrical motor frame standing on the seal plate 8 of the pump casing 1. The upper end surface is closed by attaching 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 component chamber 16 are vertically arranged in parallel in the circumferential direction adjacent to a water channel 14 extending in the cylinder axis direction. 17... 17 are partition walls that divide the chambers. The end portion 2E of the winding in the spiral chamber 2 communicates with the lower end portion of the water passage 14, and the upper end portion of the water passage 14 communicates with the pump discharge port 19 via the guide passage 18 formed in the inner peripheral portion of the head cover 12. As shown in the drawings of the embodiment, two water passages 14 and 14 are arranged opposite to each other, and their lower ends are respectively connected to terminal ends 2E and 2E of the double spiral chamber 2 respectively. In this case, the upper ends of the water channels 14 and 14 are joined at the guide channel 18 in the head cover 12 and communicate with the pump discharge port 19. The second oil chamber 15 is vertically provided so as to be narrowed between the water channels 14 and 14 via a partition wall 17, and the lower end portion thereof is connected to an oil passage hole 20 formed in a lower portion of the motor frame 11. Thus, the first oil chamber 22 formed in the peripheral portion of the mechanical seal 21 is communicated, and the upper end portion is communicated from the upper surface of the head cover 12 to the oil supply port 23 established. Reference numeral 24 denotes an oil supply plug applied to the oil supply port 23. The electrical component chamber 16 communicates with the motor frame 11 through a lead wire extraction hole 25 provided on the inner surface thereof, and the upper end surface communicates with the power cable insertion port 26 at the upper part of the motor frame 11. 27 is a hollow oil chambers made with stretchable elastic material such as synthetic rubber, which is provided inside the oil chamber so as to communicate the interior thereof hollow to swirl chamber 2 in the pump casing 1, In the drawings of the embodiment, an example in which the second oil chamber 15 is installed in the second oil chamber 15 is shown.
[0008]
Prior to the use of the pump, the oil in the first oil chamber 22 and the second oil chamber 15 is filled by supplying oil from the oil supply port 23. While the pump is being driven, the water sucked into the spiral chamber 2 from the pump suction port 6 goes through the induction path 18 while cooling the motor 13 in the motor frame 11 in the process of rising in the water path 14 from the winding end portion 2E. Then, it is discharged from the pump discharge port 19. As the operating time of the pump elapses, the oil in the first oil chamber 22 and the second yl chamber 15 gradually increases in temperature due to the lubrication of the mechanical seal 21 and the heat absorption of the motor 13, and the oil chamber increases. 27 gradually contracts, and the effective volumes of the first oil chamber 22 and the second oil chamber 15 are expanded. If the pump stops and time passes, the oil volume decreases due to the temperature drop. However, as the oil volume decreases, the oil chamber 27 gradually expands and the effective volumes of the first oil chamber 22 and the second oil chamber 15 are reduced. Therefore, the oil is maintained in a state reaching the upper part of the mechanical seal 21. Therefore, even if the operation of the pump is started again, the lubrication function of the mechanical seal 21 is not impaired. Further, part of the pumped water continues to flow into the oil chamber 27 from the swirl chamber 2 while the pump is being driven, so that the pressure difference between the swirl chamber 2 and the oil chambers 15 and 22 is reduced, and the pumped water enters the oil chamber. Be blocked.
[0009]
【The invention's effect】
According to the present invention, pumping leakage is eliminated by balancing the pressure in the swirl chamber and the pressure in the oil chamber, and the lubrication effect of the mechanical seal is enhanced by keeping the oil in the oil chamber always full. be able to.
[Brief description of the drawings]
FIG. 1 is a longitudinal side view of a portion where a water channel and a second oil chamber of a vertical submersible electric pump of the present invention are displayed.
FIG. 2 is a longitudinal side view of the vertical submersible electric pump of the present invention at a site where a water channel and an electrical component room are displayed.
FIG. 3 is a plan view of a motor frame in the vertical hydroelectric pump of the present invention.
FIG. 4 is a bottom view of a motor frame in the vertical hydroelectric pump of the present invention.
5 is a longitudinal side view taken along the line AA in FIG. 3. FIG.
6 is a longitudinal side view taken along line BB in FIG. 3. FIG.
7 is a bottom view of a head cover for closing the 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 in FIG. 1. FIG.
FIG. 9 is a longitudinal side view of a conventional vertical submersible electric pump, showing an example in which oil in the oil chamber does not reach the upper part of the mechanical seal.
[Explanation of symbols]
1 Pump casing 2 Swirl chamber 8 Seal plate 11 Motor frame
12 Head cover 15 Second oil chamber
20 Oil passage hole 21 Mechanical seal 22 First oil chamber 27 Oil chamber

Claims (1)

An oil of thermal expansion for the mechanical seal lubrication were made hollow with stretchable elastic material for offset the pressure difference between the swirl chamber and the oil chamber that occurs during the pump drive with to absorb the increase in oil volume The oil chamber is installed in a second oil chamber integrated through an oil passage hole drilled outward from a lower portion of the first oil chamber having a mechanical seal, and the oil chamber is hollow. The inner periphery of the motor frame communicates with the spiral chamber in the pump casing and is extended on the outer peripheral surface of the motor frame so as to surround the first oil chamber standing on the seal plate of the pump casing in the cylinder axis direction. the second oil chamber and the machine room is housed a motor in the motor frame part which is Tate設in parallel form circumferentially adjacent to waterways, cover the upper portions of the motor frame Characterized in that is more FutaSo, Vertical water electric pump.

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