JPH06173862A - Resin film forming device of screw type pump rotor - Google Patents

Abstract

PURPOSE:To coat a screw type pump rotor, whose tooth parts are in an undercut shape, with thermo-setting resin evenly and so as not to generate burrs on its outer surface. CONSTITUTION:In order to coat a screw type pump rotor 1 consisting of tooth parts 3 of undercut shape where the thickness of tooth descreases gradually toward its diametrical inside with thermo-setting resin 5, this resin film forming device is provided with frame members 10, 11, 12 which support a screw type pump rotor 1, an integrated heat resisting rubber mold which is held between the screw type pump rotor 1 and the frame members 10, 11, 12, a positioning means 14 for the frame members 10, 11, 12 and the screw type pump rotor 1, and positioning members for the frame members 10, 11, 12 and the heat resisting rubber mold 7.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a resin film forming apparatus for a screw type pump rotor for coating a resin on the surface of the screw type pump rotor.

[0002]

2. Description of the Related Art Conventionally, as a resin film molding method for a roots type pump rotor, there is a method of molding a resin film by an injection molding method using a mold as described in JP-A-63-117188. Are known.

[0003]

According to the prior art, in order to coat a thermosetting resin on a screw type pump rotor including a tooth portion having an undercut shape in which the tooth thickness decreases inward in the radial direction, While dividing the mold into multiple parts,
It is necessary to consider the mold release from the screw type pump rotor in which the resin film is molded. Therefore, not only does the mold have a complicated shape, but also the problem that resin enters the mating surfaces of the divided molds and burrs occur on the outer surface of the screw pump rotor. Had.

The present invention has been made in view of the above problems of the prior art. The object of the present invention is to heat a screw type pump rotor having an undercut shape in its teeth. An object of the present invention is to provide a resin film forming apparatus for a screw type pump rotor capable of coating a curable resin evenly and without causing burrs on the outer surface.

[0005]

SUMMARY OF THE INVENTION In order to solve the above problems, the present invention provides a screw type pump rotor including a tooth portion having an undercut shape in which the tooth thickness decreases inward in the radial direction with a thermosetting resin. In a resin film forming apparatus for a screw type pump rotor for coating, a frame member supporting the screw type pump rotor, an integral heat-resistant rubber mold held between the screw type pump rotor and the frame member, It comprises a positioning member for the frame member and the screw type pump rotor, and a positioning member for the frame member and the heat resistant rubber mold.

Further, it is preferable that positioning members for the frame member and the heat-resistant rubber mold are provided on the resin injection port side and the side facing the resin injection port side.

[0007]

A uniform resin film having a predetermined film thickness is formed on the outer surface of the screw type pump rotor.

[0008]

Embodiments of the present invention will be described below with reference to the accompanying drawings. 1 is a plan view of a resin film molding apparatus for a screw type pump rotor according to the present invention, FIG. 2 is a front view which is also a partial sectional view, FIG. 3 is a plan view of another embodiment, and FIG. It is a front view which is a figure.

The screw type pump rotor 1 has a shaft 2 at the center of rotation, forms an undercut shape in which the tooth thickness decreases inward in the radial direction, and has five twisted tooth portions 3.
Is formed. Further, a positioning hole 4 for positioning the rotation direction of the rotor 1 is formed on the upper surface of the rotor 1.

The resin film forming apparatus for the screw type pump rotor is
A rubber die 7 that forms a predetermined space 6 between the surface of the screw type pump rotor 1 to form the resin coating layer 5 on the surface of the screw type pump rotor 1, and the screw type pump rotor 1 for positioning and screwing the screw type pump rotor 1. It comprises a positioning jig 8 for supporting the rubber mold 7 while forming a predetermined space 6 between the surface of the pump rotor 1 and the rubber mold 7.

The rubber mold 7 is cylindrical and is integrally formed of heat resistant rubber. The positioning jig 8 includes an upper plate 10 that contacts the upper surface of the rubber mold 7, a lower plate 11 that contacts the lower surface of the rubber mold 7, and an upper plate 1.
0 and a lower plate 11 sandwiching the rubber mold 7 so as to support the rubber mold 7, and a frame member including two columns 12;
It comprises a positioning pin, an upper plate 10, and a positioning member including a rubber die 7 and a positioning hole formed in the rotor 1.

The upper plate 10 has a recess 13 into which the upper end of the rubber mold 7 is fitted, and a positioning hole 15 into which a positioning pin 14 for positioning the rubber mold 7 with respect to the positioning jig 8 is fitted. A rotor shaft hole 16 for positioning the screw type pump rotor 1 with respect to the positioning jig 8.
And a positioning hole 18 into which a positioning pin 17 for positioning the rotation direction of the screw pump rotor 1 is fitted. Further, through holes 19 into which the two columns 12 are fitted are formed at both ends of the upper plate 10.

The lower plate 11 has a recess 20 into which the lower end of the rubber mold 7 is fitted, and a rotor shaft hole 21 for positioning the screw rotor 1 with respect to the positioning jig 8.
And a resin injection port 23 for injecting a high-viscosity resin material 22 such as a thermosetting epoxy resin, which is a coating material, is formed in the space 6, and the screw type rotor 1 is further inserted in the mold 7. Positioning pin 24 for positioning so that the resin injection port 23 is directly below the thickness center 3a of the tooth portion 3
Has been planted. Further, a screw hole 25 for tightening the two columns 12 is formed at the end of the lower plate 11.

The rubber mold 7 is formed with a positioning hole 26 into which the positioning pin 14 is fitted and a positioning hole 27 into which the positioning pin 24 is fitted.

In order to form a resin film on the surface of the screw type pump rotor 1 by the resin film forming apparatus for the screw type pump rotor constructed as described above, first, the screw type pump rotor 1 is formed in the lower opening of the rubber mold 7. Screwed in, lower plate 11
The shaft 2 is inserted into the rotor shaft hole 21 and the lower end of the rubber mold 7 is fitted into the recess 20, and the positioning pin 24 is fitted into the positioning hole 27 of the rubber mold 7.

Next, the shaft 2 is inserted into the rotor shaft hole 16 of the upper plate 10, the upper end of the rubber mold 7 is fitted into the recess 13, and the positioning hole 15 of the upper plate 10 and the positioning hole of the rubber mold 7 are further inserted. The position of 26 is aligned and the locating pin 14 is fitted therein.

Then, the shaft 2 is slightly rotated so that the positioning hole 18 of the upper plate 10 and the positioning hole 4 of the screw type pump rotor 1 are aligned with each other and the positioning pin 17 is positioned.
Fit in it. Further, when the column 12 is inserted into the through hole 19 of the upper plate 10 and tightened into the screw hole 25 of the lower plate 11, the rubber mold 7 and the screw type pump rotor 1 are fixed to the positioning jig 8.

Then, a predetermined space 6 is formed between the surface of the screw type pump rotor 1 and the rubber mold 7, and the resin injection port 23 is positioned just below the thickness center 3a of the tooth portion 3.

Next, when the resin 22 is injected from the resin injection port 23, it hits the wall thickness center 3a of the tooth part 3 and then the resin 22 flows evenly on both outer peripheral surfaces 3b and 3c of the tooth part 3 and air entrapment occurs. The resin coating layer 5 having no dents or cavities is formed on the surface of the screw rotor 1.

FIGS. 3 and 4 show another embodiment, in which the sleeve 30 is used in place of the column 12 shown in FIG. 2 in order to maintain the shape of the rubber mold 7 when the rubber mold 7 is thin or has insufficient rigidity. It is a resin film forming apparatus of the screw type pump rotor in the case of doing. The other structure is almost the same as that of the embodiment shown in FIGS. The upper plate 10 and the sleeve 30 are fixed by a clamp member 31.

[0021]

As described above, according to the present invention, even in the screw type pump rotor in which the tooth portion has the undercut shape, since the resin film is formed integrally, the outer surface of the rotor is free from burrs. A uniform resin film can be formed with a predetermined film thickness without generation. In addition, the cost can be reduced by using a rubber mold, as compared with a mold that requires a complicated split surface. Also,
With the rubber mold, it is possible to easily perform the mold release by utilizing the elastic deformation of the rubber.

[Brief description of drawings]

FIG. 1 is a plan view of a resin film molding apparatus for a screw pump rotor according to the present invention.

FIG. 2 is a front view showing a partial cross-sectional view of a resin film molding apparatus for a screw type pump rotor according to the present invention.

FIG. 3 is a plan view of another embodiment.

FIG. 4 is a front view showing a partial cross-sectional view of another embodiment.

[Explanation of symbols]

1 ... Screw type pump rotor, 3 ... Tooth portion, 4, 26, 27 ...
Positioning holes, 7 ... Rubber type, 10 ... Upper plate (frame member), 11 ... Lower plate (frame member), 12 ... Struts (frame member), 13, 20 ... Recesses, 14, 17, 24 ... Positioning pins (positioning) Member), 15, 18 ... Positioning hole, 1
6, 21 ... Rotor shaft hole, 22 ... Resin, 23 ... Resin injection port, 30 ... Sleeve (frame member).

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Satoru Nakano 1-10-1 Shin-Sayama, Sayama City, Saitama Prefecture Honda Engineering Co., Ltd.

Claims (2)

[Claims] 1. A resin film forming apparatus for a screw type pump rotor, wherein a screw type pump rotor comprising a tooth portion having an undercut shape whose tooth thickness decreases inward in a radial direction is coated with a thermosetting resin. A frame member supporting the screw type pump rotor, an integral heat-resistant rubber mold held between the screw type pump rotor and the frame member, a positioning member for the frame member and the screw type pump rotor, A resin film molding apparatus for a screw type pump rotor, comprising: the frame member and a positioning member for positioning the heat resistant rubber mold. 2. A resin film molding apparatus for a screw type pump rotor according to claim 1, wherein positioning members for positioning the frame member and the heat resistant rubber mold are provided on a resin injection port side and a side facing the resin injection port side. .