JPH10248193A - Motor for pump - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a motor for a pump which can be manufactured at low cost and capable of preventing a stator from being rusted when the leakage of a liquid is preventable. SOLUTION: This motor is provided with a box 50 made of a resin in which a channel 54, through which a fluid L passes, is formed, a stator 61 formed integrally with this box 50 and disposed at a position surrounding the channel 54, a rotor 63 disposed in the channel 54 and a shaft 62 which, connected to the rotor 63, drives a fluid pump. In the stator 61, a surface 66 is spaced from the channel 54 by inserting a resin member is between, and at least a part of a surface 67 is exposed to the outside of the box 50, on which a resin mold 61 is formed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pump motor for driving a fluid pump for delivering liquid such as gasoline, and more particularly to improvement of liquid tightness and prevention of deterioration of a stator.

[0002]

2. Description of the Related Art FIGS. 9A and 9B are views showing an example of a conventional pump motor 10, in which FIG.
3A is a cross-sectional view taken along the line YY and viewed in the direction of the arrow, and FIG. 4B is a cross-sectional view taken along the line XX in FIG. FIG. 10 is a perspective view showing a main part of the pump motor 10.

[0003] The pump motor 10 includes a housing 2 made of a resin material.
0 and an electric motor unit 30. The housing 20 includes a housing main body 21 formed in a cylindrical shape, a bearing support portion 22 provided at a left portion of the housing main body 21 in FIG. (A) a lid 23 for covering the middle right opening. In FIG. 9, reference numeral 24 denotes a flow path through which the liquid L flows, and reference numeral 25 denotes a connection pipe connected to a tank (not shown).

[0004] The motor section 30 is formed integrally with the housing body 21 and is provided with a stator 3 surrounding the flow path 24.
1, a shaft 32 disposed in the flow path 24, a rotor 33 attached to the shaft 32, and a shaft 3
2 is provided.

[0005] The stator 31 includes a laminated core 31a, a coil 31b attached to the core 31a, and a supply 31c for supplying electric power to the coil 31b from outside.

The surface 36 of the core portion 31a on the side of the flow path 24 and the flow path 24 are separated by a distance δ by a resin material, and do not contact the liquid L flowing through the flow path 24. The outer surface 37 of the core portion 31a is partially exposed outside the housing body 21.

The pump motor 10 constructed as described above
Then, the electric motor unit 30 is driven by the electric power supplied from the supply unit 31c, and the rotor 33 rotates. Accordingly, the shaft 32 rotates, and the pump device is driven.

On the other hand, the liquid L introduced into the housing body 21 from the connection pipe 25 flows through the flow path 24 and is sent to the pump device. Since the flow path 24 is formed of a resin material,
No liquid leakage occurs. Since the core 31a of the stator 31 is not in contact with the flow path 24, the core 31
There is no danger that the liquid L will enter the stator 31 from a.

FIG. 11 is a perspective view showing a main part of another conventional pump motor 10. As shown in FIG. Also in this case, the outer surface 37 of the core portion 31a of the stator 31 is exposed to the outside.

[0010]

In the conventional pump motor 10 described above, the stator 31 is disposed in a mold and molded with a resin material to form the housing body 21 integrally.
In this case, since the resin material is interposed between the surface 36 and the flow path 24, the surface 36 cannot be used as a reference for positioning.
Instead, the surface 37 is used as a reference for positioning. However, since the surface 37 of the stator 31 is exposed, there is a problem that rust is generated from the surface 37.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a pump motor which can be manufactured at low cost and can prevent rust from being generated in a stator when liquid leakage can be prevented.

[0012]

Means for Solving the Problems In order to solve the above problems and achieve the object, an invention according to claim 1 is a pump motor for driving a fluid pump for sending out a fluid, wherein the fluid flows through the motor. A housing made of a resin material in which a flowing channel is formed, a stator provided integrally with the housing and disposed at a position surrounding the flow channel, and a rotor disposed in the flow channel. A shaft connected to the rotor for driving the fluid pump, wherein the stator has an inner portion separated from the flow path by interposing the resin material therebetween, and an outer portion of the stator. At least a portion is exposed to the outside of the housing and is resin-molded.

[0013] As a result of taking the above measures, the following effects occur. That is, in the first aspect of the present invention, since the housing is formed of the resin material together with the fluid flow path, leakage of the fluid can be prevented. On the other hand, a stator is provided integrally with the housing, and the stator is disposed at a position surrounding the flow path, and an inner portion of the stator is separated from the flow path with a resin material interposed therebetween. Therefore, no fluid leaks through the stator. In addition, since at least a part of the outer portion of the stator is exposed to the outside of the housing, it is possible to position the stator with reference to the outside when resin sealing is performed integrally with the housing. . Furthermore, since the portion exposed to the outside of the housing is resin-molded, it can be prevented from touching moisture, and there is no possibility that rust will occur.

[0014]

1 (a) and 1 (b) show a pump motor 40 according to an embodiment of the present invention.
4 to FIG. 4 show a molding process, and FIGS.
FIG. 4 is a view showing a mold used for manufacturing the pump motor 40.

The pump motor 40 has a housing 5 made of a resin material.
0 and an electric motor unit 60. The housing 50 includes a housing main body 51 formed in a cylindrical shape, a bearing support portion 52 provided at a left portion of the housing main body 51 in FIG. 1 to support a bearing 64 described later, and an opening at a right portion in FIG. And a lid 53 for covering the portion. In FIG. 1, reference numeral 54 denotes a flow path through which the liquid L flows, and reference numeral 55 denotes a connection pipe connected to a tank (not shown).

The motor unit 60 is integrally molded with the housing body 51 as described later, and is integrally formed with a stator (stator) 61 surrounding the flow path 54 and a shaft 62 disposed in the flow path 54. And a rotor (rotor) 63 attached to the shaft 62 and a pair of bearings 64 and 65 that support the shaft 62.

The stator 61 has a laminated core 61a, a coil 61b attached to the core 61a, a supply 61c for supplying electric power to the coil 61b from outside, and a part of the core 61a. And a resin mold 61d that seals the resin mold.

The surface 66 of the core portion 61a on the side of the flow path 54 is separated from the flow path 54 by a resin material.
4 does not come into contact with the liquid L flowing therethrough. Also, the core part 61
The outer surface 67 a is partially exposed outside the housing body 51.

Next, a description will be given of a manufacturing process of the above-mentioned housing body 51. As a first stage, as shown in FIGS. 2A and 2B, a resin mold 61d is applied to the core portion 61a.
At this time, as shown in FIG.
By aligning the surface 66 inside 1a with the reference plane α, the core portion 61a is positioned so that the axis thereof coincides with the axis C. Then, a resin mold 61d is formed at a predetermined position on the surface 67.

Next, as a second stage, FIGS.
The coil 61b is wound as shown in FIG. Then, as a third stage, as shown in FIG. 5B, a core portion 61a on which a resin mold 61d is formed is arranged in a mold 70. At this time, positioning is performed by bringing the surface of the resin mold 61d into contact with the reference plane β. In FIG. 5B, reference numeral 71 denotes an upper die, and 7 denotes an upper die.
Reference numeral 2 denotes a lower mold, in which a cavity 73 corresponding to the housing body 51 is formed. Then, when the resin material is injected, the housing body 51 as shown in FIG. 4 is formed.

The pump motor 40 constructed as described above
Then, the electric motor unit 60 is driven by the electric power supplied from the supply unit 61c, and the rotor 63 rotates. Accordingly, the shaft 62 rotates, and the pump device is driven.

On the other hand, the liquid L introduced into the housing body 51 from the connection pipe 55 flows through the flow path 54 and is sent to the pump device. Since the channel 54 is formed of a resin material,
No liquid leakage occurs. Also, since the core portion 61a of the stator 61 is not in contact with the flow path 54, the core portion 61a
There is no danger that the liquid L will enter the stator 61 from a.

As described above, in the pump motor 40 according to the present embodiment, the molding is performed with reference to the outer surface 67 instead of the surface 66 of the stator 61 on the side of the flow path 54. The liquid can be prevented from leaking without exposing the stator 61. Further, since the formation of the housing 50 and the formation of the flow path 54 can be performed at the same time, a frame or the like for preventing liquid leakage is not required, and the number of components can be reduced. For this reason, the number of steps is reduced when manufacturing the pump motor 40, and the manufacturing cost can be reduced.

Further, since the resin mold 61d is formed on a portion of the surface 67 of the stator 61 which is exposed outside the housing body 51, it is possible to prevent the resin from being in contact with moisture, and there is no possibility of rust being generated. Since the resin mold 61d is not formed on a part of the surface 67 of the stator 61 that is not exposed to the outside of the housing body 51, heat radiation can be improved.

FIGS. 6 and 7 illustrate a manufacturing process of the housing body 51 of the pump motor according to the first modification of the present embodiment. The housing body 51 according to the first modification example
However, the difference from the above-described embodiment is that a resin mold 61 d for protecting the core 61 a from moisture and a core 61
a and an insulating member 61e for insulating the coil 61b from each other. The insulating member 61e may be formed of a resin mold, or may be coated with epoxy powder or a resin-molded spool.

As a first step, as shown in FIGS. 6A and 6B, a resin mold 61d and an insulating member 61e are applied to the core 61a. At this time, as shown in FIG. 5A, first, the inner surface 66 of the core portion 61a is made to coincide with the reference surface α so that the axis of the core portion 61a is coincident with the axis C. Position. And the resin mold 6
1d is formed at a predetermined position on the surface 67.

Next, as a second stage, FIGS.
The coil 61b is wound as shown in FIG. Then, as shown in FIG. 5B, the core portion 61a on which the resin mold 61d is formed is arranged in the mold 70. At this time, positioning is performed by bringing the surface of the resin mold 61d into contact with the reference plane β. In FIG. 5B, reference numeral 71 denotes an upper die, 72 denotes a lower die, and a cavity 73 corresponding to the housing body 51 is formed. Then, when the resin material is injected, the housing body 51 as shown in FIG. 4 is formed.

In the first modified example, the coil 61b is wound after the resin mold 61d and the insulating member 61e are applied as described above, but after the insulating member 61e is applied to the core portion 61a. The coil 61b may be wound, and thereafter, the resin mold 61d may be applied.

FIGS. 8A and 8B are perspective views showing a main part of a pump motor according to a second modification of the present embodiment. In this modification, the resin mold 61d is
The resin mold 68 is formed not on a part of the surface 67 but on the entire peripheral surface. Therefore, the shape of the housing body 51A can be simplified as shown in FIG. It should be noted that the present invention is not limited to the above-described embodiment, and it is needless to say that various modifications can be made without departing from the spirit of the present invention.

[0030]

According to the first aspect of the present invention, since the housing is formed of the resin material together with the fluid flow path, leakage of the fluid can be prevented. On the other hand, a stator is provided integrally with the housing, and the stator is disposed at a position surrounding the flow path, and an inner portion of the stator is separated from the flow path with a resin material interposed therebetween. Therefore, no fluid leaks through the stator. In addition, since at least a part of the outer portion of the stator is exposed to the outside of the housing, it is possible to position the stator with reference to the outside when resin sealing is performed integrally with the housing. . Furthermore, since the portion exposed to the outside of the housing is resin-molded, it can be prevented from touching moisture, and there is no possibility that rust will occur.

[Brief description of the drawings]

FIG. 1 is a view showing a pump motor according to one embodiment of the present invention, wherein FIG. 1 (a) is a cross-sectional view taken along a line BB in FIG. FIG. 2B is a cross-sectional view taken along the line AA in FIG.

FIGS. 2A and 2B are diagrams showing a first stage of a molding process of the pump motor, wherein FIG. 2A is a perspective view of a core portion, and FIG. 2B is a sectional view taken along line C1-C1 in FIG. FIG.

FIG. 3 is a view showing a second stage of the molding process,
(A) is a perspective view of a core part, (b) is C2 in (a).
Sectional drawing cut | disconnected by the -C2 line and seen in the arrow direction.

FIG. 4 is a view showing a third stage of the molding process.

FIG. 5 is a vertical sectional view showing a mold used for manufacturing the pump motor.

FIG. 6 is a view showing a first step of a molding step of the pump motor according to the first modification of the embodiment, and (a).
Is a perspective view of the core portion, and (b) is D1-D1 in (a).
Sectional drawing cut | disconnected by the line and seen in the arrow direction.

7A and 7B are diagrams showing a second stage of the molding process, FIG. 7A is a perspective view of a core, and FIG. 7B is a cross-sectional view taken along line D2-D2 in FIG.

FIG. 8 is a perspective view showing a main part of a pump motor according to a second modification of the embodiment.

FIG. 9 is a view showing a conventional pump motor,
(A) is a sectional view taken along the line YY in (b) and viewed in the direction of the arrow, and (b) is XX in (a).
Sectional drawing cut | disconnected in the position shown by the line and seen in the arrow direction.

FIG. 10 is a perspective view showing a main part of the pump motor.

FIG. 11 is a perspective view showing a main part of another conventional pump motor.

[Explanation of symbols]

 Reference numeral 40: pump motor 50: housing 51: housing body 54: flow path 60: electric motor 61: stator (stator) 61a: core 61b: coil 61d: resin mold 62: shaft 63: rotor (rotor)

Claims (1)

[Claims] 1. A pump motor for driving a fluid pump for sending out a fluid, wherein the casing is made of a resin material and has a flow path through which the fluid flows, and is provided integrally with the casing. A stator disposed at a position surrounding the flow path; a rotor disposed in the flow path; and a shaft connected to the rotor and driving the fluid pump. Wherein the resin material is interposed and separated from the flow path, and at least a part of an outer portion thereof is exposed to the outside of the housing and is resin-molded. .