WO2008038894A1

WO2008038894A1 - A waterproof-type motor pump for self-cooling

Info

Publication number: WO2008038894A1
Application number: PCT/KR2007/003365
Authority: WO
Inventors: Il-Sun Oh
Original assignee: Shin Han R & D Co., Ltd.
Priority date: 2006-09-25
Filing date: 2007-07-11
Publication date: 2008-04-03
Also published as: KR200433323Y1

Abstract

The present invention provides a self-cooling type waterproof motor pump in which a motor frame (4), which has a spiral groove (31) in a circumferential outer surface thereof, is installed in a water jacket (3) such that water that moves along the spiral groove eliminates heat generated from the motor, thus preventing the malfunction of the motor attributable to overheating, extending the lifetime of the motor, and increasing the efficiency of the motor. To achieve the above purpose, an inlet port is provided in the lower end of the water jacket, and an outlet port is provided in the upper end of the water jacket. As well, the spiral groove is formed in the outer surface of the motor frame such that fluid drawn into the inlet port is rotated and moved upwards along the spiral groove before being discharged through the outlet port.

Description

A WATERPROOF-TYPE MOTOR PUMP FOR SELF-COOLING

Technical Field

[1] The present invention relates to a self-cooling type waterproof motor pump.

Background Art

[2] The present invention relates, in general, to self-cooling type waterproof motor pumps and, more particularly, to a self-cooling type waterproof motor pump in which a motor frame, which has a spiral groove in the circumferential outer surface thereof, is installed in a water jacket such that heat, generated from a motor when it is operated, can be effectively eliminated by a water cooling method, so that water that moves along the spiral groove eliminates heat generated in the motor, thus preventing the malfunction of the motor attributable to overheating, extending the lifetime of the motor, and increasing the efficiency of the motor, thereby reducing the maintenance cost.

[3] Generally, pumps are classified into water supply pumps, vacuum pumps and submerged pumps according to the intended purpose. A typical motor pump requires a separate cooling fan for cooling the driving heat of a motor, so that there are disadvantages in that the size of the motor pump is increased and the costs of components are increased. Furthermore, because the conventional motor pump cannot be operated in the water, there is a problem in that the motor pump cannot be used when it is submerged, for example, in the event of a natural disaster such as a flood.

[4] Meanwhile, among the disclosed pumps, there are submerged motor pumps, which are constructed such that a motor for generating power is operated underwater. However, in the case of such a submerged motor pump, because a separate cooling means is provided, it cannot be used above ground. Disclosure of Invention Technical Problem

[5] Accordingly, the present invention has been made keeping in mind the above problems occurring in the prior art, and an object of the present invention is to provide a self-cooling type waterproof motor pump in which a motor frame, which has a spiral groove in the circumferential outer surface thereof, is installed in a water jacket such that heat, generated from a motor when it is operated, can be effectively removed by a water cooling method, so that water that moves along the spiral groove eliminates heat generated by the motor, thus preventing the malfunction of the motor attributable to overheating, extending the lifetime of the motor, and increasing the efficiency of the motor, thereby reducing maintenance costs. Advantageous Effects

[6] In the self-cooling type waterproof motor pump according to the present invention, a first connection pipe is inserted at a first end thereof into the upper part of a pump casing using a coupling bolt, which is provided at a predetermined position in the upper part of the pump casing. The first connection pipe is coupled at a second end thereof to an inlet port, which is provided on the lower end of a water jacket, so that fluid drawn into the pump casing is supplied into the inlet port. Here, fluid is drawn into the inlet port through the first connection pipe using lifting force generated by the rotation of a motor shaft and an impeller. Subsequently, the fluid, which is drawn into a motor frame through the inlet port, moves upwards along a spiral groove of the motor frame. Furthermore, a second connection pipe is coupled at a first end thereof to an outlet port, which is provided in the upper end of the water jacket such that fluid is discharged from the motor frame towards the pump casing, and is inserted at a second end thereof into the upper part of the pump casing using a coupling bolt, which is provided at a predetermined position in the upper part of the pump casing. Thus, fluid can be effectively discharged from the motor frame into the pump casing through the second connection pipe.

[7] In addition, the self-cooling waterproof motor pump of the present invention has the spiral groove, which is formed in the circumferential outer surface of the motor frame such that heat, generated from the motor when it is operated, can be effectively cooled by a water cooling method. Accordingly, in the present invention, water rotates and moves upwards along the spiral groove and, therefore, effectively eliminates heat generated from the motor, thus preventing the malfunction of the motor, extending the lifetime of the motor, and increasing the efficiency of the motor, thereby reducing the maintenance cost. Brief Description of the Drawings

[8] Fig. 1 is a sectional view showing critical parts of the present invention;

[9] Fig. 2 is an exploded view of the critical parts of the present invention;

[10] Fig. 3 is a sectional view illustrating a water jacket coupled to a motor frame according to the present invention; and

[11] Fig. 4 is view showing an embodiment of a self-cooling type waterproof water pump having a relatively long connection pipe according to the present invention.

[12] [Description of the elements in the drawings]

[13] 1 : upper bracket 2: bearing

[14] 3 : water j acket 4 : motor frame

[15] 5 : rotor 6 : inlet port

[16] 7,9: connection pipe 8: outlet port [17] 10: bearing 11: casing cover

[18] 12: impeller 13: stator

[19] 14: motor shaft 15: bearing housing

[20] 16: mechanical seal 17: impeller nut

[21] 18,28: pump casing 19: washer

[22] 20,22: coupling bolt 21 : through hole

[23] 100: pump assembly

Best Mode for Carrying Out the Invention

[24] In order to accomplish the above object, the present invention provides a self- cooling type waterproof motor pump, including:

[25] a motor frame having therein an electromagnet including a rotor and a stator,

[26] a water jacket for sealing the motor frame,

[27] an upper bracket coupled to an upper end of the motor frame and having a bearing therein, [28] a bearing housing coupled to a lower end of the motor frame, with a bearing provided in an upper end of the bearing housing, and a through hole (21) formed in a lower end of the bearing housing for screw coupling, [29] a pump casing coupled at an upper part thereof to a locking bolt inserted through the through hole formed in the lower end of the bearing housing, the pump casing having an inlet for drawing fluid thereinto and an outlet, [30] a motor shaft supported at an upper end thereof by the bearing provided in the upper bracket, the motor shaft extending through the motor frame and being supported at a lower end thereof by the bearing provided in a central portion of the bearing housing, with a key provided on the lower end of the motor shaft, and [31] an impeller having at a central portion thereof a hole, in which a key hole is formed such that the key of the motor shaft is inserted into and locked to the key hole, so that the impeller is rotated along with the motor shaft to move fluid, which is drawn into the pump casing through the inlet, to the outlet, wherein [32] an inlet port for drawing fluid is provided in the lower end of the water jacket, and an outlet port for discharging the fluid is provided in the upper end of the water jacket, and [33] a spiral groove is formed in a circumferential outer surface of the motor frame, which is inserted into the water jacket, so that the fluid drawn into the inlet port rotates and moves upwards along the spiral groove and is discharged through the outlet port. [34] Preferably, the self-cooling type waterproof motor pump may further include a first connection pipe inserted at a first end thereof into a first portion of the upper part of the pump casing using a coupling bolt, which is provided at a corresponding position in the upper part of the pump casing, the first connection pipe being coupled at a second end thereof to the inlet port, which is provided in the lower end of the water jacket, so that fluid drawn into the pump casing is supplied into the inlet port through the first connection pipe, and a second connection pipe coupled at a first end thereof to the outlet port, which is provided in the upper end of the water jacket, the second connection pipe being inserted at a second end thereof into a second portion of the upper part of the pump casing using a coupling bolt, which is provided at a corresponding position in the upper part of the pump casing, such that the fluid is discharged into the pump casing through the second connection pipe.

[35] Furthermore, the first and second connection pipes, which are respectively coupled at first ends thereof to the inlet port and the outlet port, may be relatively long, and second ends of the first and second connection pipes may be coupled to the corresponding locking bolts, which are provided at the first and second portions in the upper part of the pump casing.

[36] Hereinafter, the construction, operation and effect of a preferred embodiment of the present invention will be described in detail with reference to the attached drawings.

[37] As shown in Figs. 1, 2 and 3, in the preferred embodiment of the present invention, a motor frame 4, which has therein an electromagnet including a rotor 5 and a stator 3 of the type used in a typical motor, is provided in the upper part of a self-cooling type waterproof motor pump 30.

[38] Furthermore, a water jacket 3 is provided around the motor frame 4 to seal the circumferential outer surface of the motor frame 4.

[39] In addition, an upper bracket 1 is seated onto and coupled to the upper end of the motor frame 4 to seal the motor frame 4. The upper bracket 1 includes a bearing 2 therein.

[40] The lower end of the motor frame 4 is seated onto the upper surface of a bearing housing 15. A bearing 10 is provided at the center in the upper surface of the bearing housing 15.

[41] The bearing housing 15 has a through hole 21 in the lower end thereof such that it can be coupled to an upper part of a pump casing 18 through the through hole 21 by screw coupling.

[42] The bearing housing 15 is integrally coupled to the pump casing 18 by tightening a locking bolt 21 into the insert hole 22 of the pump casing 18 through the through hole 21, which is formed through the lower end of the bearing housing 15.

[43] In other words, the locking bolt 22, which is inserted through the through hole 21 of the lower end of the bearing housing 15, is tightened into the insert hole 22, which is formed in the upper part of the pump casing 18, so that the bearing housing 15 is integrally coupled to the pump casing 18. [44] Meanwhile, the pump casing 18, which is provided in the lower part of the self- cooling type waterproof motor pump 30, has an inlet (IN), through which fluid is drawn into the motor pump, and an outlet (OUT) therein.

[45] In addition, a casing cover 11 is coupled to the upper part of the pump casing 18 to seal the upper part of the pump casing 18.

[46] Furthermore, an upper end of a motor shaft 14 is supported by the bearing 2, which is provided in the upper bracket 1. The lower end of the motor shaft 14 is supported at a predetermined position by the bearing 10, which is provided in the central portion of the bearing housing 15, through the motor frame 4. A key 27 is provided on the lower end of the motor shaft 14.

[47] An impeller 12 has in a central portion thereof a hole 24, in which a key hole 28 is formed so that the key 27 of the motor shaft 14 is inserted into and locked into the key hole 28. The impeller 12 is rotated along with the motor shaft 14 and serves to move fluid, which is drawn into the pump casing 18 through the inlet (IN), to the outlet (OUT).

[48] Furthermore, a threaded part is formed on the lower end of the motor shaft 14 such that the motor shaft 14 can be coupled to the impeller 12 through the threaded part. That is, the impeller 12 can be integrally coupled to and rotated along with the motor shaft 14 by coupling a washer 19 and an impeller fastening nut 17 to the threaded part of the motor shaft 14.

[49] Meanwhile, as shown in Figs. 1 and 2, an inlet port 6 is provided on the lower end of the water jacket 3, so that fluid for cooling is drawn into the water jacket 3 through the inlet port 6. An outlet port 8, through which the fluid is discharged, is provided in the upper end of the water jacket 3.

[50] The motor frame 4 is installed in the water jacket 3.

[51] In detail, a spiral groove 31 is formed in the circumferential outer surface of the motor frame 4, so that, when the motor is operated and the impeller 12, which is coupled to the motor shaft 14 using the key 27 of the motor shaft 14 and the key hole 28, is thus rotated by the rotation of the motor shaft 14, fluid (water or cooling water) is drawn into the motor frame through a first connection pipe 7 and the inlet port 6, moves upwards along the spiral groove, and is discharged outside the motor frame through the outlet port 8 and a second connection pipe 9, which is connected to the outlet port 8, by the difference in lifting force.

[52] As such, in the self-cooling waterproof motor pump 30 of the embodiment of the present invention, the spiral groove 31 is formed in the circumferential outer surface of the motor frame 4 such that heat generated from the motor when it is operated can be effectively cooled by a water cooling method.

[53] Hence, water rotates and moves upwards along the spiral groove 31 and therefore effectively eliminates heat generated in the motor, thus preventing the motor from malfunctioning, extending the lifetime of the motor, and increasing the efficiency of the motor, thereby reducing maintenance costs.

[54] Furthermore, as shown in Figs. 1 and 3, the first connection pipe 7 is inserted at a first end thereof into the upper part of the pump casing 18 using a coupling bolt 20, which is provided at a predetermined position in the upper part of the pump casing 18. The first connection pipe 7 is coupled at a second end thereof to the inlet port 6, which is provided on the lower end of the water jacket 3, so that fluid drawn into the pump casing 18 is supplied into the inlet port 6. Here, fluid is drawn into the inlet port 6 through the first connection pipe 7 using lifting force generated by rotation of the motor shaft 14 and the impeller 12.

[55] Subsequently, fluid, which is drawn into the motor frame 4 through the inlet port 6, moves upwards along the spiral groove 31 of the motor frame 4. The second connection pipe 8 is coupled at the first end thereof to the outlet port 9, which is provided in the upper end of the water jacket 3 such that fluid is discharged from the motor frame 4 towards the pump casing 18, and is inserted at the second end thereof into the upper part of the pump casing 18 using a coupling bolt 20, which is provided at a predetermined position in the upper part of the pump casing 18. Thus, fluid can be effectively discharged from the motor frame 4 into the pump casing 18 through the second connection pipe 8.

[56] Meanwhile, as shown in Fig. 3, the connection pipes 7 and 9 may have relatively long lengths. In this case, also, first ends of the connection pipes 7 and 9 are respectively connected to the inlet port 6 and the outlet port 8, which are respectively provided in the lower and upper ends of the water jacket 3.

[57] In addition, the second ends of the connections 7 and 9 are respectively connected to coupling bolts 25 and 26, which are provided at respective predetermined positions on the upper part of the pump casing 28.

[58] As such, because the connection pipes can have various lengths, even when the pump and the motor are constructed such that they are spaced apart from each other by a relatively long distance, fluid can be supplied to the motor frame 4, so that heat generated by the operation of the motor is effectively eliminated by the fluid which moves upwards along the spiral groove 31 formed in the circumferential outer surface of the motor frame 4.

[59] Additionally, referring to Figs. 1, 2 and 3, an internal thread is formed in the circumferential inner surface of each of the inlet port 6 and the outlet port 8. Thus, first ends of the connection pipes 7 and 9, which have threaded parts in the opposite ends thereof, respectively engage with the internal threads of the inlet port 6 and the outlet port 8. The threaded parts of the other ends of the connection pipes 7 and 9 are threaded into the corresponding coupling bolts 20, which are provided in the upper part of the pump casing 18.

[60] Furthermore, in the self-cooling type waterproof motor pump of the present invention, a packing or seal (not shown) may be formed at a corresponding position on the upper bracket 1, such that the self-cooling type waterproof motor pump can be amphibious. In addition, the bearing housing is integrally coupled to the pump casing 18 by inserting the locking bolt 21 through the through hole 21, which is formed through the lower end of the bearing housing 15. A mechanical seal 16 is provided on the upper end of the impeller 16.

[61] Moreover, those skilled in the art will appreciate that various modifications, additions and substitutions are possible.

Claims

[1] A self-cooling type waterproof motor pump, comprising: a motor frame having therein an electromagnet including a rotor and a stator, a water jacket for sealing the motor frame, an upper bracket coupled to an upper end of the motor frame and having a bearing therein, a bearing housing coupled to a lower end of the motor frame, with a bearing provided in an upper end of the bearing housing, and a through hole (21) formed in a lower end of the bearing housing for screw coupling, a pump casing coupled at an upper part thereof to a locking bolt inserted through the through hole formed in the lower end of the bearing housing, the pump casing having an inlet for drawing fluid thereinto and an outlet, a motor shaft supported at an upper end thereof by the bearing provided in the upper bracket, the motor shaft extending through the motor frame and being supported at a lower end thereof by the bearing provided in a central portion of the bearing housing, with a key provided on the lower end of the motor shaft, and an impeller having at a central portion thereof a hole, in which a key hole is formed such that the key of the motor shaft is inserted into and locked to the key hole, so that the impeller is rotated along with the motor shaft to move fluid, which is drawn into the pump casing through the inlet, to the outlet, wherein an inlet port for drawing fluid is provided in the lower end of the water jacket, and an outlet port for discharging the fluid is provided in the upper end of the water jacket, and a spiral groove is formed in a circumferential outer surface of the motor frame, which is inserted into the water jacket, so that the fluid drawn into the inlet port rotates and moves upwards along the spiral groove and is discharged through the outlet port.

[2] The self-cooling type waterproof motor pump according to claim 1, further comprising: a first connection pipe inserted at a first end thereof into a first portion of the upper part of the pump casing using a coupling bolt, which is provided at a corresponding position in the upper part of the pump casing, the first connection pipe being coupled at a second end thereof to the inlet port, which is provided in the lower end of the water jacket, so that fluid drawn into the pump casing is supplied into the inlet port through the first connection pipe, and a second connection pipe coupled at a first end thereof to the outlet port, which is provided in the upper end of the water jacket, the second connection pipe being inserted at a second end thereof into a second portion of the upper part of the pump casing using a coupling bolt, which is provided at a corresponding position in the upper part of the pump casing, such that the fluid is discharged into the pump casing through the second connection pipe.

[3] The self-cooling type waterproof motor pump according to claim 1 or 2, wherein the first and second connection pipes, which are respectively coupled at first ends thereof to the inlet port and the outlet port, are long, and second ends of the first and second connection pipes are coupled to the corresponding locking bolts, which are provided at the first and second portions in the upper part of the pump casing.