JPH11196547A - Electric pump and manufacture thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a high-quality electric pump without a defect in insulation by preventing occurrence of dew condensation in a rotor of the electric pump and a driving circuit. SOLUTION: In an electric pump, a motor casing 4 and a pump back casing 9 are assembled or formed in a body. Then, resin material 19 is filled into a space around a stator part 5 and a driving circuit 7, and the motor casing 4 is filled with the resin to prevent occurrence of dew condensation at a winding part 8 or the driving circuit 7.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric pump in the field of pumps and a method for manufacturing the same.

[0002]

2. Description of the Related Art Conventionally, electric pumps such as direct-drive sealless pumps are provided with a pump back casing for separating a motor and a pump so that water does not enter the motor.

[0003] However, the above-described electric pump of the sealless pump has a structure in which the water flow of the pump section enters the inner surface of the motor stator.

For this reason, when water having a temperature lower than room temperature is passed through the electric pump, the motor stator and the electronic circuit on which the winding of the motor, which is the outer peripheral surface of the so-called pump back casing, is provided on the back side of the pump. The built-in drive circuit unit causes operation failure due to insulation failure or rust due to water droplets adhering to dew condensation, and can be used only for liquids having a temperature of room temperature or higher.

[0005]

For this reason, the tooth surface of the stator and the drive circuit may be dealt with by applying a moisture-proofing agent or coating with a resin, but this is troublesome.

It is also conceivable to mold the motor portion with a resin, but a large-scale mold apparatus is required, and it is necessary to inject and fill the resin with a large pressure, which increases the cost. Furthermore, since the tooth surface on the inner diameter side of the stator core is exposed, invasion of moisture by capillary action cannot be completely prevented.

[0007]

SUMMARY OF THE INVENTION The present invention has been made in view of the above points, and has been made in order to solve the above-mentioned problems. The back casing is assembled to fill the motor casing surrounding the motor stator section and the drive circuit section with a resin material to prevent dew condensation on the winding section and the drive circuit section. An electric pump is provided.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An electric pump and a method of manufacturing the same according to the present invention are constructed by assembling a motor casing of a motor section of a direct drive sealless pump and a pump back casing of a pump section to surround a motor stator section and a drive circuit section. The motor casing is filled with a resin material to prevent dew formation on the winding portion and the drive circuit portion.

An electric pump 1 drives a sealless pump 3 by direct drive of a motor 2 as shown in FIG. 1. A motor stator 5 is provided inside a motor casing 4 and an end motor casing 5 is provided at a rear portion thereof. 6 and a drive circuit unit 7 mounted in the end motor casing 6
, And controls the power supply to the winding 8 of the motor stator 5 to drive the pump 3.

As shown in FIG. 1, the pump 3 is provided with a hat-shaped pump back casing 9 along the rear part of the pump 2 in a watertight manner inside the motor stator 5 of the motor 2, and a magnet 10 inside the pump back casing. An impeller 11 buried axially symmetrically and integrally formed is rotatably housed in a pump casing 12 and assembled. 13 is an impeller rotating shaft, 14,
Reference numeral 15 denotes a shaft support, 16 denotes a suction port, and 17 denotes a discharge port.

In the electric pump 1 assembled and formed as described above, a required resin material 19 having fluidity flows from a lead wire outlet 18 opened in the end motor casing 6 as shown in FIG. And the pump back casing 9, the end motor casing 6 and the stator 5
The resin material 19 is filled in a motor casing surrounding the drive circuit section 7 and is hardened and integrated.

By filling the resin material 19 from the resin inlet 20 into the motor 2 assembled with the electric pump 1 in this way, the outside air is shut off and the stator core 2 of the motor 2 is
1 and the drive circuit 7 can be prevented from dew formation, and can be used for liquids having a temperature lower than room temperature.

Also, since the resin material flows into the closed motor casing and is filled after the electric pump is assembled, a mold for molding is not particularly required, so that the filling device can be simplified and the resin material can be simplified. Can be in an airtight state in close contact with each casing.

In the above description, the resin material is introduced from the lead wire outlet of the end motor casing. However, the resin inlet may be provided at an appropriate position in the motor casing and the pump back casing.

Further, in the above description, the motor casing and the pump back casing are provided separately, but it is possible to carry out an appropriate operation based on the gist of the present invention, for example, by integrating the motor casing and the pump back casing.

[0016]

FIG. 1 shows an embodiment of the present invention and is an example of a direct drive sealless pump. The electric pump 1 is assembled by connecting a motor casing 4 to an end motor casing 6, a pump back casing 9, and a pump casing 12, as shown in FIG.

The required resin material 19 flows into the motor stator 5, the drive circuit unit 7, the lead wire 21, etc. from the lead wire inlet 18, and the motor casing is filled with the resin material 19. And lead wire inlet 18
The lead wire fixing bush 22 is mounted and sealed while the resin material 19 is soft.

Therefore, by filling the inside of the motor in the motor casing surrounding the electric pump with the resin material, the outside air is shut off, and dew condensation is prevented from occurring on the stator core of the motor and the drive circuit portion. Can be used for low temperature liquids. In particular, since the resin material flows into the casing and is filled after the electric pump is assembled, a mold for molding is not particularly required, and the filling device can be simplified.

Further, since the lead wire inlet is used as a resin material inlet, no opening of the resin inlet is required, and the lead wire inlet can be reliably sealed.

FIG. 2 shows another embodiment of the present invention, in which a motor casing 4 is formed by integrating an outer peripheral portion of an end motor casing and a pump back casing. The resin material 19 flows from the cover 23 side and fills the motor casing.

In particular, as shown in FIG. 2, the filling surface of the resin material 19 is set slightly inside the end cover 22 of the motor casing 4 so that leakage at the time of injection of the resin material 19 can be prevented. Similarly, outside air can be shut off to prevent dew condensation on the stator core of the motor and the drive circuit.

[0022]

As described above, according to the present invention, the motor casing of the motor section of the direct drive sealless pump and the pump back casing of the pump section are assembled to surround the motor stator section and the drive circuit section. By filling the casing with the resin material, the resin material can be formed integrally with the casing in the electric pump, and the resin material can be in an airtight state in which the casing is in close contact with each casing, and dew condensation occurs on the winding portion and the drive circuit portion Can be prevented.

Therefore, the quality can be improved by eliminating insulation failure, and the liquid can be used even at a temperature lower than room temperature. Further, since the resin material can be flowed and filled using the casing, a mold for molding is not required, and the filling device can be simplified.

In addition, by assembling the motor and the pump together and filling the motor casing with the resin material from the lead wire inlet of the motor casing, it is not necessary to open the resin inlet and the lead wire inlet is also provided. The sealing state can be reliably established.

[Brief description of the drawings]

FIG. 1 is a partially cut-away side view of an embodiment of the present invention;

FIG. 2 is an explanatory side sectional view in which the end cover of another embodiment of the above is disassembled and partially omitted.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Electric pump 2 ... Motor 3 ... Pump 4 ... Motor casing 5 ... Motor stator 6 ... End motor casing 7 ... Drive circuit part 8 ... Winding 9 ... Pump back casing 11 ... Impeller

Claims (4)

[Claims] A motor casing of a motor part of a direct drive sealless pump and a pump back casing of a pump part are assembled, and a resin material is filled in a motor casing surrounding a motor stator part and a drive circuit part and wound. An electric pump characterized in that dew condensation is prevented from occurring on a wire portion and a drive circuit portion. 2. The electric pump according to claim 1, wherein the motor casing and the pump back casing are integrally formed. 3. A motor and a pump of a direct drive sealless pump are combined and assembled to assemble a motor casing of a motor part of a magnet pump and a pump back casing of a pump part from a resin inlet provided in a motor casing. A method for manufacturing an electric pump, characterized in that a resin material flows into and fills a motor casing surrounding a motor stator portion and a drive circuit portion to prevent dew condensation from occurring in a winding portion and a drive circuit portion. 4. The method according to claim 3, wherein the resin inlet is a lead wire outlet.