JP2004218460A - Heat pipe cooled submersible motor pump - Google Patents

Abstract

A heat-pipe-cooled submersible motor pump capable of reducing the number of parts, simplifying the structure, and obtaining a high cooling effect is provided.
A heat pipe cooling type submersible motor pump 1 includes a vertical shaft submersible motor 2 and a pump 3 driven by the submersible motor 2 and is installed in a suction water tank 4. An outer periphery of the motor frame 10 is surrounded by a metal ring 11, and a plurality of heat pipes 12, 12... From below. The heat radiating portions 12B of the heat pipes 12, 12 are inserted upward from the lower side at predetermined intervals and are watertightly inserted into the cover 14 to communicate with the inside of the pumping pipe 9.
[Selection diagram] Fig. 1

Description

[0001]
FIELD OF THE INVENTION
TECHNICAL FIELD The present invention relates to a heat pipe cooling type underwater motor pump having a heat pipe.
[0002]
[Prior art]
In a submersible motor pump including a submersible motor and a pump driven by the submersible motor, the motor frame is cooled by water pumped by an impeller of the pump rotationally driven by the submersible motor or a part thereof. There is an underwater motor. As shown in FIG. 5, the underwater motor includes a pump casing 50 in which an impeller 51 is rotatably accommodated, and cooling water pressurized in a rear shroud portion 51 a of the impeller 51 is supplied to a plurality of water passages in an intermediate casing 52. Through a cooling pipe 53 and a water cooling chamber 56 formed by a motor frame 54 and a water cooling jacket 55. The cooling water in the water cooling chamber 56 absorbs the heat of the core chamber 57 via the motor frame 54 and returns to the rear shroud portion 51a of the impeller 51 again through the intermediate casing 52. A part of the circulated cooling water is discharged to the outside from a discharge pipe 58 at an upper portion of the water cooling jacket 55, and a part of the circulated cooling water is replaced with pumping water to prevent the temperature of the cooling water from rising.
[0003]
On the other hand, the cooling water pressurized in the rear shroud portion 51a of the impeller 51 passes through another water passage 52b of the intermediate casing 52, passes through the cooling pipe 59a, and is guided to the radiator 60. The cooling water passing through the radiator 60 absorbs the heat of the core chamber 57 and returns to the rear shroud portion 51a of the impeller 51 again through the cooling pipe 59b and the intermediate casing 52.
[0004]
However, in the submersible motor pump of FIG. 5, pump pumping is used for cooling water to the radiator 60. Since a normal submersible motor pump handles rainwater, sewage, sewage, and the like, the dirt of pumped water used for cooling water adheres to the inner surface of the radiator 60 to reduce the cooling effect, or the inner surface of the cooling pipes 59a and 59b There was a possibility that the cooling water might be obstructed by sticking.
[0005]
Therefore, as shown in FIG. 6 and FIG. 7, a drive-side magnet 62a fixed to the main shaft 61 and a driven-side magnet 62c fixed to the driven shaft 62b are provided at the upper end of the motor at the shaft end opposite to the pump. A magnet shaft coupling 62 is provided, an impeller 63 is fixed to the tip of the driven shaft 62b, and a casing 64 is provided so as to surround the impeller 63. The impeller 63 and the casing 64 constitute a pump 65. The casing 64 is connected to the cooling pipe 59b via the suction pipe 66a and to the radiator 60 via the discharge pipe 66b, so that the radiator 60, the cooling pipes 59a and 59b, the casing 64, the suction pipe 66a and the discharge There has been proposed an underwater motor in which a closed loop for circulating fresh water through a pipe 66b is formed (for example, see Patent Document 1).
[0006]
The rotation of the underwater motor drives the impeller 51 to rotate, and the cooling water boosted in the rear shroud portion 51 a of the impeller 51 passes through the plurality of water passages 52 a of the intermediate casing 52 and is guided to the water cooling chamber 56. . The cooling water in the water cooling chamber 56 absorbs heat generated by the motor cores 67 and 68 and the coil, and then returns to the rear shroud portion 51a of the impeller 51 again through the intermediate casing 52.
[0007]
Since the pump 65 is rotationally driven via the magnet shaft joint 62 together with the rotational driving of the impeller 51, the cooling water is forcibly circulated to the radiator 60. The cooling pipes 59 a and 59 b connecting the pump 65 and the radiator 60 are cooled by cooling water in a water cooling chamber 56 formed by the motor frame 54 and the water cooling jacket 55, and the coil ends and the rotor taken by the radiator 60 are removed. Heat is released outside the motor. As described above, the pump 65 connected to the radiator 60 is provided near the motor / coil end, and the pump 65 and the radiator 60 are connected by the cooling pipes 59a and 59b passing through the water cooling chamber 56, so that the cooling water supplied to the radiator 60 is provided. The pump can use fresh water instead of pumping water. Therefore, it is possible to avoid problems such as contamination of the pumping water adhering to the inner surface of the radiator 60 to reduce the cooling effect and sticking to the inner surfaces of the cooling pipes 59a and 59b to hinder the flow of the cooling water.
[0008]
[Patent Document 1]
JP-A-8-294250 (FIGS. 1, 2 and 3)
[0009]
[Problems to be solved by the invention]
However, in addition to the main shaft 61, the stator core 67, the stator coil and the rotor core 68, which are main components of the underwater motor, the water cooling chamber 56 formed by the motor frame 54 and the water cooling jacket 55 and the rear shroud portion 51 a of the impeller 51 increase the pressure. In addition to the necessity of a self-pumping water cooling system such as a water passage 52a for guiding the self-pumped water to the water cooling chamber 56, fresh water is circulated by the radiator 60, the cooling pipes 59a and 59b, the casing 64, the suction pipe 66a, and the discharge pipe 66b. A fresh water cooling system is required that forms a closed loop and forcibly circulates cooling water composed of fresh water to the radiator 60 by a pump 65 that is rotationally driven with the main shaft 61 via the magnet shaft coupling 62. As a result, the structure is complicated, and there is a possibility that a failure is likely to occur.
[0010]
The present invention has been made in view of such circumstances, and provides a heat pipe cooling type submersible motor pump capable of reducing the number of parts, simplifying the structure, and obtaining a high cooling effect. It is an object.
[0011]
[Means for Solving the Problems]
In order to achieve the above object, a heat pipe cooling type underwater motor pump according to the present invention includes an underwater motor and a pump driven by the underwater motor, and a heat absorbing portion of the heat pipe is capable of absorbing heat by the underwater motor. The pump is characterized in that the heat radiating portion of the heat pipe is mounted facing the inside of the pumping pipe of the pump at a level higher than the level of the heat absorbing portion.
[0012]
Further, the heat pipe cooling type submersible motor pump may be an in-line type in which the heat pipe cooling type submersible motor pump is installed in the air outside the suction water tank. The “in-line type” refers to a type in which a submersible motor pump is interposed in a pipeline including a suction piping system and a discharge piping system.
[0013]
According to the first aspect of the present invention, the heat of the submersible motor is absorbed by the heat of vaporization of the working fluid that is heated and evaporated (vaporized) by the heat of the submersible motor in the heat absorbing portion of the heat pipe. The density of the evaporated working fluid is reduced. For this reason, the working fluid moves to the heat radiating section at a level higher than the level of the heat absorbing section, where it is cooled by the self-pumping water of the pump to radiate heat and condense (liquefy). The density of the condensed working fluid increases. As a result, the working fluid is returned to the heat absorbing section at a level lower than the level of the heat radiating section. By repeating such a cycle, the underwater motor is cooled.
[0014]
According to the second aspect of the present invention, there is no need to separately provide an air cooling system or a water cooling system for the underwater motor.
[0015]
BEST MODE FOR CARRYING OUT THE INVENTION
An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a partially cutaway side view of an embodiment of the invention described in claim 1, and FIG. 2 is an enlarged sectional view taken along line AA of FIG. The motor pump 1 includes a vertical shaft submersible motor 2 and a pump 3 driven by the submersible motor 2 and is installed in a suction water tank 4. Then, the impeller (not shown) of the pump 3 is driven to rotate by the rotation of the underwater motor 2, water in the suction water tank 4 is sucked into the casing 6 from the suction port 5, and the discharge curved pipe 8 from the discharge port 7 to the pumping water The water is pumped along the pipe 9.
[0016]
The outer periphery of the vertical shaft submersible motor 2, that is, the outer periphery of the motor frame 10 is surrounded without any gap by a metal ring 11, and the metal ring 11 has a plurality of heat pipes 12, 12,. The portion 12A is fitted downward from the upper side at a predetermined interval in the circumferential direction.
[0017]
On the other hand, at a position slightly higher than the upper end of the metal ring 11 in the pumping pipe 9, that is, a position slightly higher than the heat absorbing portion 12 </ b> A of the heat pipe 12, the inside of the vertical shaft submersible motor 2 is deviated in the direction of the center axis C and is pumped. An overhang 13 communicating with the inside of the pipe 9 is provided, and the overhang 13 is closed by a bowl-shaped cover 14 in a watertight and detachable manner. As shown in FIG. 3, the heat radiating portions 12B of the heat pipes 12, 12,... Are inserted upward from the lower side at predetermined intervals and watertightly inserted into the cover , And is held by the cover 14 via the holding plate 15 so as not to swing. The heat absorbing portion 12A and the heat insulating portion 12C are continuous through a horizontal bent portion, and the heat insulating portion 12C and the heat radiating portion 12B are continuous through a vertical bent portion.
[0018]
With such a configuration, the heat of the submersible motor is generated by the heat of vaporization of the working fluid such as water or alternative Freon which is heated and evaporated (evaporated) by the heat of the submersible motor 2 in the heat absorbing portions 12A of the heat pipes 12, 12. Absorb. The density of the evaporated working fluid is reduced. For this reason, the hydraulic fluid moves to the heat radiating portion 12B located at a position slightly higher than the heat absorbing portion 12A, where it is exposed to the self-pumping water of the pump 3, that is, the self-pumping water in the pumping pipe 9, cooled and radiated to condense (liquefy). ). The density of the condensed working fluid increases. Thereby, the working fluid is returned to the heat absorbing portion 12A located at a position slightly lower than the heat radiating portion 12B. By repeating such a cycle, the underwater motor 2 is cooled.
[0019]
That is, since the cooling of the underwater motor 2 is performed by the plurality of heat pipes 12, 12,..., The number of parts is significantly reduced and the structure is simplified as compared with the conventional example of FIGS. , And a high cooling effect can be obtained due to the excellent heat exchange characteristics of the heat pipes 12, 12,....
[0020]
Further, the pumping pipe 9 is provided with an overhang 13 that is offset in the direction of the central axis C of the vertical shaft submersible motor 2 and communicates with the inside of the pumping pipe 9. A cover 14 that closes the overhang 13 has heat pipes 12, 12. .. Since the respective heat radiating portions 12B are inserted and the heat radiating portions 12B are retracted from the pumping passage cross-section of the pumping pipe 9, the cross-sectional area of the pumping pipe 9 is reduced by the heat radiating portions 12B, and the internal resistance of the pumping pipe 9 is reduced. Does not occur. Moreover, the dimension L from the central axis C of the vertical shaft submersible motor 2 to the mating surface 14A between the overhang portion 13 and the cover 14 is measured from the central axis C to the mating surface 16 between the discharge port 7 of the pump 3 and the discharge curved pipe 8. Since the length can be reduced to the dimension L or less, the heat-pipe-cooled submersible motor pump 1 can be easily taken in and out of the inlet hole (not shown) of the ceiling (not shown) of the suction water tank 4.
[0021]
On the other hand, as shown in FIG. 4, a dry pit 17 is provided near the suction water tank 4, and the heat pipe cooling type submersible motor pump 1 described with reference to FIGS. The port 5 is configured to communicate with the inside of the suction water tank 4 via the suction pipe system 18, that is, in a state where the heat pipe cooling type submersible motor pump 1 is installed in the atmosphere inside the dry pit 17 outside the suction water tank 4. Even in the case of an in-line type interposed in a pipeline composed of the suction piping system 18 and the discharge piping system 19 provided with the discharge bending pipe 8 and the water pumping pipe 9, as in the above embodiment, the heat pipe 12,12... Since a high cooling effect can be obtained by the excellent heat exchange characteristics possessed, air cooling equipment such as a fan for cooling the submersible motor 2 in the dry pit 17 and the self pumping water of the pump 3 are circulated. There is no need to separately provide a water-cooling equipment, such as water-cooled chamber for. Moreover, even if rainwater or the like flows into the dry pit 17 in an emergency and submerges the submersible motor 2, it is not affected at all and has a high cooling effect due to the excellent heat exchange characteristics of the heat pipes 12, 12,. Can be demonstrated.
[0022]
In the above embodiment, the configuration in which the heat radiating portion 12B is positioned at a position slightly higher than the heat absorbing portion 12A has been described. The same operation and effect as the embodiment can be obtained.
[0023]
【The invention's effect】
As described above, since the heat pipe cooling type submersible motor pump of the present invention is configured, the following special effects are obtained.
[0024]
According to the first aspect of the present invention, since the cooling of the underwater motor is performed by the heat pipe, the number of parts can be significantly reduced as compared with the conventional example, and the structure can be simplified, and the heat can be reduced. A high cooling effect can be obtained by the excellent heat exchange characteristics of the pipe.
[0025]
According to the second aspect of the present invention, there is no need to separately provide an air cooling facility such as a fan for cooling a submersible motor and a water cooling facility such as a water cooling chamber in which self-pumping water of a pump circulates. In addition, even if the underwater motor is submerged in an emergency, a high cooling effect can be exerted by the excellent heat exchange characteristics possessed by the heat pipe without any influence.
[Brief description of the drawings]
FIG. 1 is a side view, partially broken away, showing an embodiment of the invention described in claim 1;
FIG. 2 is an enlarged sectional view taken along line AA of FIG.
FIG. 3 is an enlarged sectional view taken along line BB of FIG. 1;
FIG. 4 is a side view showing an embodiment of the invention described in claim 2;
FIG. 5 is a sectional view of a first conventional example.
FIG. 6 is a sectional view of a second conventional example.
FIG. 7 is an enlarged sectional view of a main part of a second conventional example.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Heat pipe cooling type underwater motor pump 2 Underwater motor 3 Pump 4 Suction water tank 9 Pumping pipe 12 Heat pipe 12A Heat pipe heat absorbing part 12B Heat pipe heat radiating part

Claims (2)

A submersible motor and a pump driven by the submersible motor, wherein a heat absorbing portion of the heat pipe is attached to the submersible motor so as to absorb heat, and a heat radiating portion of the heat pipe is at a level equal to or higher than the level of the heat absorbing portion. A heat-pipe-cooled submersible motor pump, which is mounted facing the pumping pipe. The heat pipe cooling type submersible motor pump according to claim 1, wherein the heat pipe cooling type submersible motor pump is an in-line type installed in the air outside the suction water tank.

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