JP2001082390A - Resin molding and manufacturing method thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To realize shortening of a manufacturing process, improvement of workability, and reduction of a manufacturing cost by a method therein a gap between a pipe and an end face member is sealed by utilizing a nature to shrink resin during molding of a resin molding product. SOLUTION: In a canned motor wherein a pipe 12 is molded by using thermoset resin and integral molding with a mold flange 11 situated on the end face side of the pipe 12 is carried out, the canned motor comprises a contact surface pressed in the longitudinal direction of the pipe 12 through contraction force of resin exerted on a protrusion part; and an O-ring 30 to generate an elastic force by a press force exerted on the contact surface and seal a gap between the mold flange 11 and the end face of the pipe 12.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a resin molded article in which a pipe is molded with a resin that shrinks during solidification, and a method of manufacturing the same.

[0002]

2. Description of the Related Art As a resin molded product, for example, a technique in which a fluid flow path is formed in a stator mold portion of a canned motor pump and integrally molded is disclosed in Japanese Patent Application Laid-Open No. H10-281092. Such a stator mold portion is molded by, for example, injection molding such as RIM molding, a core forming a flow path is arranged at a predetermined position in a mold, and a resin in a fluid state is injected into the mold by a chemical reaction. It is obtained by solidifying to a desired shape and forming a flow path in a resin molded product.

[0003] Here, the term "mold" means that a material of the same or another material is put into a resin molded product and integrally molded. The above publication also discloses a technique in which a pipe (tube) is placed in a mold and molded, and the pipe is used as a flow path.

When this pipe is used, for example, as a flow path of a fluid (even in the form of a gel or a particle) passing through the inside of a canned motor, a gap between an end face member disposed on an end face of the stator mold portion and the pipe is formed. Need to be sealed. That is, if the seal between the end face member and the pipe is not sealed or the sealing is insufficient, the handling liquid or the like flowing in the pipe enters the resin, and the leakage or leakage of the stator molded in the resin may occur. It may cause a short circuit.

In order to avoid such an adverse effect, a sealing member such as an O-ring or a gasket is interposed between the end member and the pipe, and the flange formed at both ends of the pipe and the end member are bolted. It was necessary to seal with the elasticity of the sealing member generated by joining. still,
When the pipe and the end member are made of a metal material or a weldable resin, a method of sealing the pipe and the end member by welding can be considered.

[0006]

However, in this resin molded product, it was necessary to tighten or weld with bolts to generate elasticity in the sealing member. Work is required, and there has been a problem that the number of manufacturing steps increases and workability deteriorates. Incidentally, in the case of fastening with bolts, there is also a problem that the number of parts increases and the manufacturing cost deteriorates accordingly.

The present invention has been made in view of such circumstances, and utilizes the property that resin shrinks during molding of a resin molded product to seal between a pipe and an end face member, thereby making it possible to manufacture the resin in a manufacturing process. It is an object of the present invention to provide a resin molded product and a method for manufacturing the same, which can achieve a reduction in manufacturing cost, improvement in workability, and reduction in manufacturing cost.

[0008]

According to the first aspect of the present invention,
While molding the pipe with the resin that contracts when it solidifies,
In a resin molded product integrally formed with an end face member disposed on the pipe end face side, a contact surface pressed in a longitudinal direction of the pipe by a contraction force of the resin received by a protruding portion, and provided on the corresponding contact surface. And a seal portion for generating elasticity by the pressing force to seal between the end face member and the pipe end face.

According to this configuration, the projecting portion receives the contraction force of the resin, presses the contact surface in the longitudinal direction of the pipe, and generates elasticity to the seal portion.
A seal is provided between the end face member and the pipe end face.

[0010] According to a second aspect of the present invention, the seal portion includes:
It is a seal member interposed between the pipe end face and the end face member.

According to this configuration, the sealing between the end face member and the pipe is performed by distorting the seal member by the pressing force from the contact surface to generate elasticity.

The invention according to claim 3 is characterized in that the seal member is an O-ring or a gasket.

According to a fourth aspect of the present invention, at least one of the pipe and the end face member is made of an elastic body, and the seal portion is a contact portion of the elastic body with the pipe end face or the end face member. And

[0014] According to this configuration, the seal between the pipe end face and the end face member is made by the elasticity of the pipe or the end face member without interposing a seal member between the pipe end face and the end face member.

The invention according to claim 5 is characterized in that only the abutting portion of the pipe or the end face member or the vicinity thereof is made of an elastic body.

The invention according to claim 6 is characterized in that the resin is made of a thermosetting resin.

According to this configuration, since the thermosetting resin has an irreversible property such that it does not return to the original flow state due to the temperature rise after molding, the temperature rise due to heating or heat generated from outside or inside the resin molded product. Does not soften the thermosetting resin and does not decrease the sealing force.

The invention according to claim 7 is characterized in that a heat source is molded in the thermosetting resin.

According to this configuration, even when the temperature rises due to the heat generated from the heat source, the thermosetting resin does not soften and the sealing force does not decrease.

The invention according to claim 8 is characterized in that the resin after solidification is a stator molded portion in which a stator of a canned motor is molded, and the pipe is a flow passage through which a handled liquid passes. Features.

According to a ninth aspect of the present invention, after the pipe is arranged at a predetermined position in a mold in which a desired shape is formed, the resin in a flowing state is poured into the mold, and the shrinkage force at the time of solidification of the resin is set. Is provided to the end face member.

[0022]

Embodiments of the present invention will be specifically described below with reference to the drawings. The resin molded product according to the present embodiment includes a stator mold part of a canned motor pump, and has a pipe in which a handling liquid flows in the stator mold.

As shown in FIG. 2, the canned motor pump 1 having the stator mold section 2 has a front casing section 3 on a front end face and rear casing sections 4 and 5 on a rear end face. The appearance is constituted by. Reference numeral 20 in the figure denotes a junction box in which a terminal 20a (shown in FIG. 1) for supplying a current to the stator 7 is provided.

As shown in FIG. 1, the stator mold portion 2
Is provided with a rotor 8 rotatable about a shaft 9 in a space inside thereof and a can 6 formed along an outer peripheral surface of the space. A stator 7 is molded between a space portion and an external portion of the stator mold portion 2 (a portion to be filled with resin), and a rotor 8 is applied by applying a voltage to the stator 7. Shaft 9
It is arranged to rotate around.

Bearings 10 are provided near both ends of the shaft 9, respectively.
In the case of 0, the axial movement of the shaft 9 is restricted by the thrust washer 19 and the key 21. Further, impellers 13 are fixed to both ends of the shaft 9, respectively, so that the rotation of the rotor 8 is transmitted to the impeller 13.

In the stator mold part 2, four pipes 12 are molded at the four corners on the outer peripheral side of the stator 7, and the openings at both ends thereof face the end face of the stator mold part 2. . Further, a mold flange 11 is formed on an end face of the stator mold section 2, and is disposed so as to cover an end face of the pipe 12 other than the opening.

The pipe 12 in the mold flange 11
An insert nut 14 as shown in FIG. 5 is molded at the upper and lower positions in FIG.
A screw hole 14a extending in the axial direction is formed from the center of one of the four surfaces. A female screw is formed on the inner peripheral wall of the screw hole 14a, and can be screwed with a screw 16 and bolts 15a and 15b described later.

On the side of the insert nut 14,
Two recesses 14b and 14c are formed,
While molding the b side with the mold flange 11,
The concave portion 14c is molded with the stator mold portion 2.
A hole 11a is formed at a position corresponding to the screw hole 14a in the mold flange 11. And FIG.
As shown in FIG. 5, the bolts 15a and 15b and the screw 16 can be inserted into the screw hole 14a.

The front casing section 3 or the rear casing sections 4, 5 and the stator mold section 2 are connected by bolts 15a, 15b screwed to the respective insert nuts 14, and a bearing housing 29 accommodating the bearing 10 is provided. The mold flange 11 and the mold flange 11 are connected by a screw 16 screwed to each insert nut 14.

The front casing section 3 and the rear casing section 5 are connected to the front and rear faces of the stator mold section 2, and rotatably house impellers 13 protruding from both end faces of the stator mold section 2 and rotatably accommodate the impellers 13. A flow path 22 extending from the disposition portion of the pipe 12 to the tip end opening of the pipe 12,
23 are formed, and flow paths 24 and 25 extending to the flange 18 and the rear casing part 4 are respectively formed.

The rear casing part 4 has 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 the front surface of the front casing part 3 and the rear surface of the rear casing part 4 by a hexagon bolt 17 and is connected to the flow paths 24 and 26 and opens to the outside of the canned motor pump 1.
7, 28 are formed.

With this configuration, the impeller 13 on the front side
After passing through the openings 24 and 22 and the pipe 12 due to the rotating action of the
5 and 26, and is discharged from the opening 28 (during discharge, the rotation of the rear impeller 13).
The interior of the stator mold portion 2 that is likely to generate high heat when energized is cooled.

As described above, when the handling liquid passes through the pipe 12, in order to prevent the handling liquid from leaking between the mold flange 11 on the end face and the pipe 12, an O-ring 30 as a seal member is provided between these members. (FIGS. 3 and 4
See also). The O-ring 30 provides elasticity by the applied force to the mold flange 11 and the pipe 1.
2 and exerts a sealing function.
In this embodiment, the contact surface 1 of the mold flange 11
1b (detailed later) and the end flange 12 of the pipe 12
a.

Here, the insert nut 14 and the mold flange 11 constitute an end member for pressing the O-ring 30 by a force caused by shrinkage of the resin when it is solidified.
The insert nuts 14 are provided at four locations (see FIGS. 3 and 9) so as to surround both ends of the opening of the pipe 12, and reference numeral 11c denotes a gasket groove formed in the mold flange 11. Is shown. Reference numeral 11d in FIG. 9C indicates a projection formed in the gasket groove 11c, and has a function of concentrating stress and improving the sealing property of the gasket.

As shown in FIG. 4, the end face member has a contact face 11b (mold flange 1) which contacts the O-ring 30.
1) and a protrusion 14d (insert nut 1) that is molded in the stator mold portion 2 and protrudes in a direction orthogonal to the resin shrinkage direction of the stator mold portion 2.
4 side). Note that the protruding portion 14d may be protruded in a direction inclined at a predetermined angle with respect to the shrinkage direction of the resin.

Since the insert nut 14 is formed by insert molding on the mold flange 11, the contact surface 11b and the protrusion 14d are formed continuously, and the force (resin of resin) applied to the protrusion 14d is formed. Contraction force) contact surface 1
1b to press the O-ring 30.

Further, the stator mold portion 2 is made of a material that contracts when it is solidified. Considering that the stator mold portion 2 has a stator 7 as a heat source, for example, polydicyclopentadiene (epoxy resin, Phenolic resin, unsaturated polyester, diallyl phthalate, polyimide)
Thermosetting resins such as PPE, PPS, and PEE are preferable if they are resins that shrink during solidification.
K, etc., which meet necessary specifications such as liquid resistance and heat resistance).

Next, a method of manufacturing the canned motor pump 1 will be described (see FIG. 1). First, the stator 7, the pipe 12, the can (stator liner) 6, and the mold flange 11 (one each on the left and right sides of the stator 7) are arranged at predetermined positions in the mold. A thermosetting resin is poured into the mold, and these components are solidified while being integrated to form a stator mold portion 2.
Get.

At the time of this solidification, as shown in FIG. 4, the contraction force P0 of the resin of the stator mold portion 2 becomes a force P1 for pulling the projecting portion 14d of the insert nut 14 rightward in the figure, and this force P1 is Contact surface 11b
And the force P2 for pressing the O-ring 30. Thereby, the space between the stator mold part 2 and the pipe 12 is tightly sealed by the elasticity of the O-ring 30 increased by the force P2. In addition, since the pipes 12 are equally distributed at the four corners of the stator mold section 2, the internal stress generated in the stator mold section 2 during solidification of the resin is well balanced.

Thereafter (see FIG. 1), the rotor 9, the shaft sleeve 36, the thrust washer 19, the shaft 9 on which the key 21 and the like are formed are incorporated into the stator mold part 2, and a carbon bearing 10 serving as a slide bearing is inserted. The molded bearing housing 29 and the molded flange 11 are connected by the screw 16. Then, the impeller 13 is fastened to the shaft 9 with a nut, and the assembly of the rotating parts is completed.

Thereafter, the front casing part 3 and the rear casing parts 4, 5 formed by separate resin molding are connected by bolts 15a, 15b, and then the flange 18
And the front casing part 3 and the rear casing part 4 are connected by a hexagonal bolt 17, and the canned motor pump 1
The main assembling work is completed. Of course, mold flange 1
A gasket is used to seal between the front casing 1 and the front casing and the rear casing 4, and between the rear casings 4 and 5, so that the handling liquid does not leak.

As described above, according to the resin molded product of the present embodiment, a means for applying a force to generate elasticity in the O-ring 30 (for example, a fastening means with a bolt or the like) is not required, so that the configuration is simplified, and the components are simplified. Points can be reduced.

Further, according to the present embodiment, since the manufacturing process such as the fastening means is not required, the manufacturing process can be shortened.
Workability can be improved. Note that components such as the can (stator liner) 6 and the pipe 12 that come into contact with the fluid flowing in the stator mold portion 2 are formed of members separate from the stator mold portion 2, and therefore may be configured according to the properties of the fluid. These materials can be selected, and the most suitable canned motor pump 1 can be obtained according to the purpose of use.

Although the present embodiment has been described above, the application of the present invention is not limited to the canned motor pump, but can be widely applied to all resin molded products in which pipes are molded. The pipe or the mold flange 11 may be made of metal, resin, or another material. Further, the present invention can be applied to a resin molded product sealed by a gasket instead of the O-ring 30. still,
A liquid gasket (liquid gasket) can also be used.

Further, the insert nut 14 and the mold flange 11 may be formed as an integral component (end face member), such as the configuration shown in FIG. 6, the configuration shown in FIG. 7, or the configuration shown in FIG. It may be.

The resin molded product A shown in FIG. 6 has a structure in which the end of a pipe 12 ′, which is present therein, is sealed with an end member 32 via a gasket 31 by molding, and a resin 32 is formed at the protrusion 32 a of the end member 32. After receiving the contraction force, the force is transmitted to the contact surface 32b, and the gasket 31 is pressed.
This pressing force increases the elasticity of the gasket 31, improves the sealing performance, and can be applied to the pipe 12 'having no flange formed at the tip. Note that, instead of the gasket 31, another seal member (for example, an O-ring or the like) using elasticity may be used.

The resin molded product B shown in FIG. 7 has a configuration in which the end of the pipe 12 existing inside the mold is sealed with an end member 33 via an O-ring 30.
After receiving the contraction force of the resin at the protrusion 33a, the force is transmitted to the contact surface 33b, and the O-ring 30 is pressed. This pressing force increases the elasticity of the O-ring 30 and improves the sealing performance. Note that, instead of the O-ring 30, another sealing member (for example, a gasket or the like) using elasticity may be used.

The resin molded product C shown in FIG. 8 has a configuration in which the O-ring 30 abutting on the end flange 12a of the pipe 12 is pressed by the end member 34.
After receiving the contraction force of the resin at 4a, the force is applied to the contact surface 34b.
And presses the O-ring 30. On the other hand, pipe 12
The end flange 12b also receives the contraction force of the resin on the right side in the figure, and the O-ring 30 is deformed by this force and the pressing force applied to the contact surface 34b to increase the elasticity and improve the sealing performance. . Note that, instead of the O-ring 30, another sealing member (for example, a gasket or the like) using elasticity may be used.

According to this method, it is possible to seal only one side. The length l of the end flange 12b may be adjusted so that a pressing force required for sealing can be obtained. If the pressing force can be maintained only by l ', the end flange 12b becomes unnecessary.

In addition to the above-mentioned O-ring, gasket, and other elastic members forming a sealing portion with a resilient sealing member,
Without using these sealing members, the molded pipe 12
Alternatively, the seal portion may be configured such that the mold flange 11 itself has elasticity so that the contraction force of the resin is received at the end face of the pipe 12. The end of the pipe 12 or the contact portion of the mold flange 11 with the end of the pipe 12 constitutes a seal portion.

In this case, as in the resin molded product D shown in FIG. 10, in order to obtain a sufficient sealing force between the end face of the pipe 12 and the mold flange 11, the projection 12c (seal portion)
It is preferable to transmit the contraction force of the resin received by the protruding portion 35a to the contact surface 35b to concentrate the stress applied to the contact surface 35b.

The pipe 12 or the mold flange 1
1, only the portion where these come into contact may be formed of an elastic body. In this case, it is preferable that two-stage injection molding is performed on the end face of the pipe 12 or the contact portion of the mold flange 11 with the pipe 12 so that an elastomer or the like is attached to the portion (seal portion).

In the above embodiment, the pipe 1 is mainly used by utilizing the contraction force of the resin in the longitudinal direction of the resin molded product.
Although the sealing force is obtained by the force acting in the longitudinal direction of 2, the contraction force in the radial direction of the pipe 12 in the resin molded product may be used.

In this case, as shown in FIG. 11, the projecting portion 37 of the end face member 37 and the flange at the end of the pipe 12 are inclined as shown to reduce the radial contraction force P0 of the resin in the longitudinal direction of the pipe 12. The force is converted into the force P3 or P4 in the direction, and the O-ring 30 is given elasticity.

That is, the radial contraction force P0 is applied to the protrusion 37
Or forces P7, P8 against the flange at the end of the pipe 12.
Of these components P7 and P8 (vertical components P5 and P6 in the drawing and horizontal components P3 and P4 in the drawing), P3 and P4 in the horizontal direction are pipes. 12 acts in the longitudinal direction to increase the sealing force.

[0056]

According to the present invention, by utilizing the property that the resin shrinks during molding of the resin molded article, the gap between the pipe and the end face member is sealed, thereby shortening the manufacturing process and improving the workability. Manufacturing costs can be reduced. Furthermore, according to the sixth and seventh aspects of the present invention, since the resin is a thermosetting resin, the resin does not return to the original flowing state or softened state even when the temperature rises, and the sealing force is maintained. Can be.

[Brief description of the drawings]

FIG. 1 is a sectional view of a canned motor pump applied as a resin molded product according to the present invention.

FIG. 2 is a side view and a front view of a canned motor pump applied as a resin molded product according to the present invention.

FIG. 3 is an enlarged view of a portion II in FIG.

FIG. 4 is an enlarged schematic diagram of FIG. 3;

FIG. 5 is a side view showing an insert nut of a canned motor pump applied as a resin molded product according to the present invention.

FIG. 6 is a schematic view showing a resin molded product A according to the present invention.

FIG. 7 is a schematic view showing a resin molded product B according to the present invention.

FIG. 8 is a schematic view showing a resin molded product C according to the present invention.

9A is a front view showing a stator mold part of a canned motor pump applied as a resin molded product according to the present invention, FIG. 9B is an enlarged view of a part X in FIG. 9A, and FIG. CC
Line cross section

10A is a schematic view showing a resin molded product D according to the present invention, and FIG. 10B is an enlarged view of a Y part in FIG.

11A is a schematic view showing a resin molded product E according to the present invention, and FIG. 11B is an enlarged view of a Z part of FIG.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Canned motor pump 2 ... Stator mold part (resin molded product) 3 ... Front casing part 4, 5 ... Rear casing part 6 ... Can (stator liner) 7 ... Stator 8 ... Rotor 9 ... Shaft 10 ... Bearing 11 ... Mold flange (end face member) 11a ... Hole 11b, 32b, 33b, 34b, 35b, 37b ... Contact face 11c ... Gasket groove 11d ... Protrusion 12, 12 '... Pipe 12a, 12b ... End flange 12c ... Protrusion 13 ... Impeller 14 ... Insert nut (end face member) 14a ... Screw hole 14b, 14c ... Recess 14d, 32a, 33a, 34a, 35a, 37a ... Protrusion 15a, 15b ... Bolt 16 ... Screw 17 ... Hex bolt 18 ... Flange 19 ... Thrust washer 20 Junction box 20a Terminal 21 Key 22 -26 ... flow path 27, 28 ... opening 29 ... bearing housing 30 ... O-ring (seal member) 31 ... gasket 32, 33, 34, 35, 37 ... end face member 36 ... shaft sleeve A, B, C, D, E: resin molded product P0: contraction force P1 to P4: force

Claims (9)

[Claims] 1. A resin molded product molded with a resin that shrinks during solidification and integrally formed with an end member disposed on an end surface of the pipe, wherein the shrinkage force of the resin received at a projecting portion causes the pipe to shrink. A resin molding comprising: a contact surface pressed in a longitudinal direction; and a seal portion that generates elasticity by a pressing force applied to the contact surface and seals between the end surface member and the pipe end surface. Goods. 2. A resin molded product according to claim 1, wherein said seal portion is a seal member interposed between said pipe end face and said end face member. 3. The resin molded product according to claim 2, wherein said seal member is an O-ring or a gasket. 4. The apparatus according to claim 1, wherein at least one of the pipe and the end face member is made of an elastic body, and the seal portion is a contact portion of the elastic body with the pipe end face or the end face member. Resin molded products. 5. The resin molded product according to claim 4, wherein only the abutting portion of the pipe or the end face member or the vicinity thereof is made of an elastic body. 6. The resin molded product according to claim 1, wherein said resin is made of a thermosetting resin. 7. A resin molded product according to claim 6, wherein a heat source is molded in said thermosetting resin. 8. The method according to claim 1, wherein the resin after solidification is a stator molded part obtained by molding a stator of a canned motor, and the pipe is a flow path through which a handled liquid passes. The resin molded product according to claim 1. 9. After arranging the pipe at a predetermined position in a mold where a desired shape is formed, the resin in a flowing state is poured into the mold, and a contraction force when the resin is solidified is applied to the end face member. 9. The method according to claim 1, wherein:
The method for producing a resin molded product according to any one of the above.