JP2001231212A - Resin molded motor and its manufacturing method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a resin molded motor wherein a cabinet molded by resin is reinforced and workability in the course of manufacturing can be improved, and its manufacturing method. SOLUTION: In the resin molded motor provided with a casing 2a molded by resin, a stator 7 arranged in the cabinet 2a, a rotor 8 which rotates together with a shaft 9 in the stator 7, and mold flanges 11 arranged on both side surfaces of the cabinet 2a, a coupling member 31 which is molded in the casing 2a and interconnects the mold flanges 11 is installed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a resin-molded motor in which a housing is formed of resin and a rotor is rotated by applying a voltage to a stator, and a method of manufacturing the same.

[0002]

2. Description of the Related Art Conventionally, as a canned motor having a can interposed between a stator and a rotor, for example, Japanese Unexamined Patent Publication No.
No. 2,810,922. In such a canned motor, the stator is molded with a thermoplastic resin such as an epoxy synthetic resin by a molding method such as injection molding, compression molding, and transfer molding.
A canned motor pump using this canned motor,
The casing is fixed to the front surface of the canned motor and includes a casing having a suction port for sucking a fluid such as a handling liquid and a discharge port for discharging the fluid.

[0003] With this configuration of the canned motor pump, the rotor is rotated by electromagnetic induction caused by applying a voltage to the stator, and is formed in the casing by the rotation of a shaft and an impeller interlocked with the rotor. A fluid such as a handling liquid can be sucked from the suction port, and the fluid can be discharged from the discharge port.

A bearing for supporting a shaft is provided in the canned motor, and the bearing housing is fastened to an end plate formed on a side surface of a casing of the canned motor to thereby connect the bearing to the canned motor. Is fixed at a predetermined position.

When the canned motor pump is used, a duct or the like connected to an external pipe is attached to the suction port and the discharge port of the casing, and the pump is set to exert a pumping action on the fluid in the pipe. .

[0006]

However, in the above-mentioned conventional canned motor, since its housing is formed of resin, its rigidity is lower than that of a metal canned motor. It deforms and causes various problems.

[0007] For example, moments in various directions are applied to the casing depending on the mounting state of the duct connected to the pipe, and the load due to the moment may shift the bearing via the end face plate.

If the center of the shaft is displaced from the center of the bearing, the shaft and the bearing interfere with each other to generate a large frictional force, which may cause a reduction in motor efficiency or damage to the shaft or the bearing. was there. In addition, when the deviation is remarkable, the rotor may be locked and the motor may be burned.

On the other hand, as used in general-purpose DC motors, there is a known type in which a hole or a notch is formed in an epoxy mold portion as a housing, and the motor is reinforced through a through bolt. To manufacture a motor,
It is necessary to form a hole or a notch for the through bolt, and there is a problem that workability in manufacturing the motor is deteriorated.

The present invention has been made in view of such circumstances, and provides a resin-molded motor that can reinforce a resin-molded housing and improve workability in a manufacturing process. With the goal.

[0011]

According to the first aspect of the present invention,
A housing formed of resin, a stator provided in the housing, to which voltage can be applied from the outside, a rotor rotating with the shaft in the stator, and a housing disposed on both side surfaces of the housing. And a connecting member which is molded in the housing and connects the end face plates to each other.

According to such a configuration, the connecting member can be molded at the same time as the housing is formed at the time of manufacturing, and the load applied to one end face plate is applied to the other end plate via the connecting member at the time of use. Disperse on end plate.

According to a second aspect of the present invention, the connecting member is
One end is fixed to one end face plate by screwing, and the other end is fixed to the other end face plate by fitting.

According to this configuration, after one end face plate and the connecting member are connected by screwing, the other end face plate is fitted and connected to the other end of the connecting member, so that the assembly can be performed in a short time. . When a plurality of connecting members are attached to the end face plate, they can be attached all at once and securely.

According to a third aspect of the present invention, in the other end plate, a fitting member having a partially cut-out annular shape is fixed, and a groove formed in the other end of the connecting member is formed. The connection member and the other end face plate are connected by fitting into the ring of the fitting member.

The invention according to claim 4 is characterized in that the connecting member is provided in a canned motor having a can interposed between the stator and the rotor.

According to a fifth aspect of the present invention, there is provided an assembling step of assembling the connecting member and the stator between predetermined positions of the two end face plates facing each other, and the connecting member and the stator assembled in the assembling step. And a molding step of molding the housing while molding with resin.

According to a sixth aspect of the present invention, the assembling step includes:
After fixing one end of the connecting member to one end plate by screwing and assembling the stator at a predetermined position, the other end plate is fixed to the other end of the connecting member fixed to the one end plate by fitting. It is characterized by doing.

[0019]

Embodiments of the present invention will be specifically described below with reference to the drawings. The induction motor type canned motor pump of the present embodiment rotates a rotor by an electromagnetic induction effect generated by applying a voltage to a stator, and sucks and discharges a fluid by the rotational force, as shown in FIG. A canned motor 2 as a resin molding motor, a front casing 3 disposed on a front end face of the canned motor 2, and rear casing sections 4 and 5 on a rear end face. Is configured. Reference numeral 20 in the figure denotes a junction box in which a terminal 20a (see FIG. 1) for supplying a current to the stator 7 is provided.

As shown in FIG. 1, a canned motor 2 in an induction motor type canned motor pump 1 has a rotor 8 rotatable about a shaft 9 in a space inside thereof.
And a can (stator liner) 6 is formed along the outer surface of the space. The can (stator liner) 6 is a liquid-tight cylindrical member formed by FRP (fiber reinforced resin), but may be made of another resin, or may be made of another material (for example, metal or the like). ).

Then, between the space portion of the canned motor 2 and the external portion (the portion to be filled with resin to become the housing 2a)
A stator 7 is molded, and the rotor 8 is arranged to rotate about a shaft 9 by applying a voltage to the stator 7.

In the vicinity of both ends of the shaft 9, bearings 10 (carbon bearings as sliding bearings) which are insert-molded in bearing housings 29 are provided, respectively. Axial movement is restricted. Further, impellers 13 are provided at both ends of the shaft 9.
Are respectively fixed, and the rotation of the rotor 8 is transmitted to the impeller 13.

In the canned motor 2, four pipes 12 are molded at four corners on the outer peripheral side of the stator 72 (see FIG. 3).
It is configured to face the end face. A mold flange 11 as an end face plate as shown in FIG. 3 is formed on both end faces of the canned motor 2, and is arranged so as to cover an end face of the pipe 12 other than the opening.

As shown in FIG.
An insert nut 14 is molded at the upper and lower positions of the pipe 12 in the figure, and a screw 16 and bolts 15a and 15b are screwed into a screw hole extending from the center of one surface of the insert nut 14 in the axial direction. It is concluded by joint. Reference numeral 30 indicates an O-ring that seals between the pipe 12 and the mold flange 11.

Furthermore, a screw-type insert nut 33 or a fitting-type insert nut 32 for screwing or fitting a connecting member 31 described in detail later is provided at the left and right positions of the pipe 12 in the figure. Inserted inside.

The front casing 3 or the rear casings 4, 5 and the canned motor 2 are connected by bolts 15a, 15b screwed to the respective insert nuts 14, and are molded with a bearing housing 29 containing the bearing 10. The flange 11 is connected by screws 16 screwed to the respective insert nuts 14.

The front casing 3 and the rear casing 5 are connected to the front and rear of the canned motor 2, respectively.
The impellers 13 protruding from both end surfaces of the canned motor 2 are rotatably accommodated, and flow paths 22 and 23 are formed to extend from a portion where the impellers 13 are provided to a tip end opening of the pipe 12. Channels 24 and 25 extending to the part 4 are respectively formed.

In the rear casing part 4, a flow path 2 which is continuous with the flow path 25 of the rear casing part 5 and extends to the flange 18.
6 are formed. The flange 18 is fixed to a front surface of the front casing portion 3 and a rear surface of the rear casing portion 4 by a hexagonal bolt 17, and is connected to the flow paths 24 and 26 so as to be open to the outside of the induction motor type canned motor pump 1. , Discharge ports 28 are formed.

With this configuration, the impeller 13 on the front side
The fluid such as the handling liquid which has flowed in from the suction port 27 by the rotating action of the fluid flows through the flow paths 24, 22 and the pipe 12, and then is discharged from the discharge port 28 through the flow paths 23, 25, 26. Is driven by the rotation of the rear impeller 13), and the inside of the canned motor 2, which tends to generate high heat when energized to the stator 7, can be cooled.

In consideration of the fact that the stator 7 which is a heat source is provided inside the canned motor 2, for example, a polydicyclopentadiene (epoxy resin, phenol resin, unsaturated polyester, sialyl phthalate, polyimide) or the like can be used. Although it is preferable to mold with a thermosetting resin, even a thermoplastic resin such as PPE, PPS, PEEK
And so on, which may meet required specifications such as liquid resistance and heat resistance.

Here, the induction motor type canned motor pump 1 according to the present invention has a connecting member 31 made of metal for connecting between the two mold flanges 11 as shown in FIG. 4 and a connecting member 31 as shown in FIG. A screw-type insert nut 33 and a fitting-type insert nut 32 for fixing the connecting member 31 to the mold flange 11 are provided.

Although the connecting member 31 is preferably a metal rod-shaped member as in the present embodiment, rigidity can be secured and
Other materials may be used as long as the load applied to one mold flange 11 can be dispersed to the other mold flange 11.

The connecting member 31 has a male thread formed at one end 31a and a tapered shape at the other end 31b, and a groove 31c is formed at the root of the tapered shape. The groove 31c has such a size that a fitting member 34 (previously provided in a fitting type insert nut 32, which will be described in detail later) having a partially cut-out shape of an annular shape as shown in FIG. 6 can be fitted. Is formed.

On the other hand, as shown in FIG. 5 (a), the screw-type insert nut 33 is formed with two screw holes 33a, 33b extending from both end faces in the axial direction, respectively. A female screw corresponding to the male screw at one end 31a of the connecting member 31 is formed on the inner peripheral surface. Further, as shown in FIG. 3B, the fitting type insert nut 32 has a screw hole 32a extending from one surface in the axial direction (in the same manner as the screw type insert nuts 33a and 33b, a female screw is formed on the inner peripheral surface). Is formed, and a fitting hole 32b extending from the other surface to face the screwing hole 32a is formed.

The inner peripheral surface of the fitting hole 32b is
1 has a shape substantially similar to the tapered shape of the other end 31 and a shape in which a groove 32ba into which the fitting member 32 can be fitted is added.
4 has been inserted.

In this state, when the other end 31b of the connecting member 31 is inserted into the fitting hole 32b, the fitting member 32 is gradually pressed in the radial direction due to the tapered shape of the other end 31b, and is formed. The notch expands the diameter and the groove 3
When the fitting member 32 is inserted to 1c, the diameter of the fitting member 32 is reduced to the original diameter. That is, the fitting member 34 fits into the groove 31c, so that the other end 31b of the connecting member 31 is fitted to the fitting type insert nut 32.

The screw-type insert nut 33 and the fitting-type insert nut 32 are shown in FIGS.
(B) is inserted into the mold flange 11,
While supporting both ends of the connecting member 31, the canned motor 2 is screwed with the bolts 15c and 15d.
To the front casing part 3, the rear casing part 4,
5 is fixed.

With this configuration, the rigidity of the canned motor 2 can be improved, and when a load such as a moment is applied to one of the mold flanges 11, the load is transmitted to the connecting member 31 so that the other mold flange 11 is moved. And it is possible to prevent an excessive load from being applied only to one of the mold flanges 11.

The above-mentioned induction motor type canned motor pump 1
Is attached to an external pipe, ducts 35 and 36 formed in the pipe are attached to the suction port 27 and the discharge port 28, and the fluid in the pipe is sucked from the suction port 27 by the rotation of the impeller 13 on the front side. With the rear impeller 1
The fluid is discharged from the discharge port 28 to the pipe by the rotating action of Step 3.

At this time, the arrangement state of the piping or the duct 35
In some cases, an excessive moment is applied to the flange 18 depending on the mounting state of the flanges 36. That is, the pipe is not always linearly extended with respect to the suction ports 27 and 28, and may be attached in a bent state due to, for example, a space problem or a positional relationship with another device.

In such a case, an excessive moment due to the bending of the pipe or the like causes the intake ports 27, 2 through the ducts 35, 36.
The bearing 10 transmitted to the mold flange 8 and the mold flange 11 and fixed to the mold flange 11 may be damaged, or the center of the bearing 10 may be shifted with respect to the center of the shaft 9 to cause interference.

According to this embodiment, the load input from one pipe is transmitted to the connecting member 31 and escapes to the other pipe, so that a large force is not applied to the housing 2a of the canned motor 2. Therefore, a load such as an excessive moment is not transmitted to the bearing 10, and the above problem can be solved.

Next, a method of manufacturing the above-described induction motor type canned motor pump 1 will be described with reference to FIGS. Manufacturing the induction motor type canned motor pump 1 according to the present embodiment includes an assembling step and a forming step.

The assembling step includes connecting the connecting member 31, the stator 7, and the fixing member 31 between predetermined positions of the two facing mold flanges 11.
This is a step of assembling the can 6 and the pipe 12. Specifically, as shown in FIG. 7, one end of the connecting member 31 is fixed to one mold flange 11 installed on the floor surface by screwing, and After assembling the stator 7 at the center of the flange 11, the other mold flange 11 is fixed to the other end of the connecting member 31 from above by fitting (FIG. 8).
reference).

By such a process, the plurality of connecting members 31
(In the present embodiment, the number is eight, but the number is not limited to this.) It is possible to assemble with one touch at a glance, and the assembling workability of the connecting member 31 can be improved. Further, as described above, since the connecting member 31 fitted to the mold flange 11 at one end has a structure that is difficult to be detached from the fitted-type insert nut 32, the workability of the subsequent process is deteriorated due to the detachment. Can be avoided.

Next, the following forming step is performed. That is,
The mold flange 11 on which the connecting member 31, the stator 7, the pipe 12, the can (stator liner) 6 and the like are assembled is disposed at a predetermined position in a resin molding die, and is fluidized by reaction injection molding (RIM). Is poured into the mold, and the connecting member 31 and the pipe 12 are solidified while being integrated by molding to obtain the housing 2a of the canned motor 2.

According to this process, the connecting member 31 can be molded in the housing 2a simultaneously with the resin molding of the housing 2a, so that a step of separately forming a hole or a notch for passing the connecting member 31 is unnecessary. Since the workability is improved and the housing 2a and the connecting member 31 are integrally formed, the rigidity of the canned motor 2 can be further improved as compared with the case where the connecting member 31 is passed through a hole or a notch.

Thereafter, the rotor 8, the shaft sleeve 3
6, the shaft 9 on which the thrust washer 19, the key 21 and the like are formed is incorporated into the housing 2a of the canned motor 2,
A bearing housing 29 in which a carbon bearing 10 serving as a plain bearing is insert-molded and a mold flange 11 are connected by screws 16. Then, the impeller 13 is fastened to the shaft 9 by a nut, and the assembly of the canned motor 2 (resin molding motor) is completed.

After connecting the front casing part 3 and the rear casing parts 4, 5 formed by separate resin molding with bolts 15a, 15b, 15c and 15d, the flange 18 and the front casing part 3 and the rear casing part are connected. The main assembly work of the induction motor type canned motor pump 1 is completed by connecting the part 4 with the hexagon bolt 17.

According to the canned motor 2 of the induction motor type canned motor pump 1 manufactured as described above, the housing 2
Since the connecting member 31 is resin-molded at a, the rigidity of the canned motor 2 can be further improved. In this case, since the connecting member 31 is made of metal, the load applied to one mold flange 11 can be distributed to the other mold flange 11.

Although the present embodiment has been described above, the present invention is not limited to the induction motor type canned motor pump, but may be applied to a resin molding motor of another form using a drive source (including a DC type or an AC type). ). Further, the present invention may be applied to a case in which a casing is provided only on the front surface of the canned motor, and a fluid inlet and a fluid outlet are formed in the casing. Further, the resin molding motor of the present invention is not limited to a motor applied to a liquid pump such as a handling liquid, but may be applied to a gas motor such as a blower.

[0052]

According to the first and fifth aspects of the present invention,
The housing 2a formed of resin can be reinforced, and the workability in the manufacturing process can be improved.

According to the second aspect of the present invention, the work of assembling the connecting member to the both end face plates can be facilitated.
In addition, when a plurality of connecting members are attached to the end face plate, they can be performed all at once and reliably, and workability at the time of assembling them can be improved.

According to the invention of claim 3, the invention of claim 2 can be realized with a simple configuration.

According to the fourth aspect of the present invention, the deformation of the resin molding motor causes the seal member disposed between the end face plate and the can, for example, to be displaced or broken, thereby impairing the seal function. Can be avoided.

According to the sixth aspect of the present invention, a plurality of connecting members can be assembled at once with one touch, and the workability of assembling the connecting members can be improved.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an induction motor type canned motor pump to which a canned motor according to the present invention is applied,
2A is a sectional view taken along line AA in FIG. 2, and FIG. 2B is a sectional view taken along line BB in FIG.

FIG. 2 is an external view showing an induction motor type canned motor pump to which the canned motor according to the present invention is applied.

FIG. 3 (a) is a front view of a canned motor according to the present invention,
(B) Enlarged view of part X in (a)

FIG. 4 is a side view showing a connecting member included in an induction motor type canned motor pump to which the canned motor according to the present invention is applied;

FIG. 5 is a side view showing (a) a screw-type insert nut and (b) a fitting-type insert nut provided in an induction motor type canned motor pump to which the canned motor according to the present invention is applied.

FIG. 6 is a sectional view taken along line VI-VI in FIG.

FIG. 7 is a perspective view showing a manufacturing process of the canned motor of the present invention.

FIG. 8 is a perspective view showing a manufacturing process of the canned motor of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Induction motor type canned motor pump 2 ... Canned motor (resin molding motor) 2a ... Housing 3 ... Front casing part (casing part) 4, 5 ... Rear casing part (casing part) 6 ... Can (stator liner) 7 ... Stator 8 ... Rotor 9 ... Shaft 10 ... Bearing 11 ... Mold flange (end face plate) 12 ... Pipe 13 ... Impeller 14 ... Insert nut 15a, 15b, 15c, 15d ... Bolt 16 ... Screw 17 ... Hex bolt 18 ... Flange 19 ... Thrust washer 20 ... Junction box 20a ... Terminal 21 ... Key 22-26 ... Flow path 27 ... Suction port 28 ... Discharge port 29 ... Bearing housing 30 ... O-ring 31 ... Connecting member 31a ... One end 31b ... Other end 31c, 32ba ... Groove 32: Fitting type insert nut 32a, 2b, 33a ... Nishigoana 33 ... screwed type insert nut 33b ... engaging hole 34 ... fitting member 35 ... duct 36 ... shaft sleeve

Claims (6)

[Claims] 1. A housing formed of resin, a stator disposed in the housing and capable of applying a voltage from the outside, a rotor rotating together with a shaft in the stator, and the housing. A resin molded motor having end plates disposed on both side surfaces of the resin molded motor, further comprising a connecting member molded in the housing to connect the end surface plates to each other. 2. The connecting member according to claim 1, wherein one end of the connecting member is fixed to one end face plate by screwing, and the other end is fixed to the other end face plate by fitting. Resin molding motor. 3. A fitting member having a partially cut-out annular shape is fixed to the other end face plate, and a groove formed at the other end of the connecting member is formed in a circle of the fitting member. 3. The resin-molded motor according to claim 2, wherein the connecting member and the other end face plate are connected by being fitted to a ring. 4. The resin according to claim 1, wherein the connecting member is provided on a canned motor having a can interposed between the stator and the rotor. Forming motor. 5. An assembling step of assembling the connecting member and the stator between predetermined positions of the two facing end face plates, and molding the connecting member and the stator assembled in the assembling step with resin. The method for manufacturing a resin-molded motor according to any one of claims 1 to 4, further comprising a molding step of molding the housing. 6. The assembling step includes fixing one end of the connecting member to one end face plate by screwing, assembling a stator at a predetermined position, and then fixing the other end face plate to the one end face plate. The method according to any one of claims 2 to 4, wherein the connecting member is fixed to the other end of the connecting member by fitting.