JPH041868Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Field of Industrial Application) The present invention relates to a bellows-type pump used in a pouring mechanism such as a jar pot.

(Prior Art) As shown in FIG. 5, this type of bellows-type pump has conventionally had a bellows-like main body that is open at least at one end and has a flange portion 16 projecting outward at right angles from the periphery of the opening. 1, a lid-side opening 17 that fits into the opening side of the bellows-like main body 1, and a flange 18 that extends outward from the end surface periphery of this opening 17 and is welded to the flange portion 16 of the bellows-like main body 1.
It has a structure in which a lid body 4 made of synthetic resin having a shape is attached to a fitting part 15 of the bellows-shaped main body 1 and welded. A lid body 4 is attached to the fitting portion 15 of the bellows-shaped main body 1.
The opening 17 is connected to the flange 16 on the bellows-shaped main body 1 side
The bellows-shaped main body 1 and the lid 4 temporarily fitted thereto are rotated integrally by fitting and holding the bellows-shaped main body 1 with a gap formed between the outer surface and the outer surface of the flange 18 of the lid 4. The flange portion 1 of the bellows-like main body 1
6. By heating the peripheral edge part, when the flange part 16 of the bellows-shaped main body 1 melts into a bead shape, the opening 17 of the lid body 4 is further fitted into the bellows-like main body 1, and the bellows-like main body 1 is heated. Flange portion 16 and lid body 4
The bellows-shaped main body 1 and the lid body 4 are welded together by closely contacting the flanges 18 and by sandwiching and pressing the flanges together to form a bellows-shaped pump.

(Problems to be Solved by the Invention) According to the above configuration, since the flange portion 16 of the bellows-like main body 1 is heated, the melted portion of the flange portion 16 of the bellows-like main body 1 does not come into close contact with the lid body 4 before crimping. Since it is necessary to provide a gap as shown in FIG. Bellows-shaped body 1
The problem was that the flange portion 16 of the weld was deformed, the welding became uneven, and peeling failures occurred frequently due to insufficient welding strength.

(Means for Solving the Problems) The present invention has been made to eliminate the above-mentioned drawbacks, and the flange portion of the bellows-shaped main body is formed by slightly curving toward the lid body side.

(Function) With the configuration described above, the bellows-shaped main body and the lid body housed in the respective molds fit the opening of the lid body into the bellows-like main body fitting portion, and the flange of the bellows-like main body and the flange of the lid are in surface contact. These peripheral edges and end faces are heated and welded while intensively rotating. In this case, the flatness of the flange portion is ensured by the curved end surface of the flange surface of the bellows-shaped main body, so that it is difficult to deform and uniform welding is performed.

(Example) An embodiment of the present invention will be described below with reference to the drawings.

The configuration of the embodiment is as shown in FIGS. 1 to 4. First, to explain the welding structure shown in FIG. 3, the A formwork 6 attached to the shaft 5 is formed into a U-shaped cross section with the surface opposite to the side where it is attached to the shaft 5 open, and the inside of the recess is A holding chamber 7 is formed for accommodating and supporting the bellows-shaped main body 1. The A-form frame 6 and the shaft 5 are attached so that the center axis of the holding chamber 7 and the rotation center axis of the shaft 5 coincide. On the other hand, on the side of the A-form frame 6 facing the open surface, a B-form frame 9 is fixed to a horizontally movable shaft 8, and this B-form frame 9 has a recess formed in the surface facing the A-form frame 6. This concave portion serves as a B holding chamber 10 that accommodates and holds the lid 4. The central axis of this B holding chamber 10 coincides with the central axis of the A-form frame 6 and also with the axis of rotation of the shaft 5. In the welding apparatus configured in this manner, the burner 11 is positioned facing and adjacent to the peripheral end surface of the A-form frame 6 on the opening side. This burner 11 is a hot jet burner that blows out heated air. Next, the structure of the bellows-shaped main body 1 and the lid body 4 which are welded together will be explained. The bellows-shaped main body 1 has a plurality of bellows 12 on its peripheral wall, and has a bottom wall 13 integrally formed at the bottom. That is, it is formed into a container shape with one end open and the cross-sectional shape substantially U-shaped. A ring-shaped recess into which one end of the restoring coil spring 14 is fitted and held is formed in the center of the bottom wall 13 of the bellows-shaped main body 1, and the opening is located approximately along the axis from the maximum inner diameter of the bellows 12. The bellows-shaped main body side fitting part 15 is composed of a cylindrical wall slightly elongated along the direction, and furthermore, a flange part 16 projecting outward in the radial direction is provided on the peripheral edge of the opening end of this main body side fitting part 15. It was formed. On the other hand, the lid 4 has a cap shape that opens toward the bellows-like main body 1, and has a lid-side opening 17 corresponding to the main-body side fitting part 15 having a wall slightly extending along the axial direction on its outer periphery. Furthermore, a flange 18 is formed on the outer peripheral edge of this opening 17 and projects outward in the radial direction. As shown in FIG.
A core portion 19 that fits into and holds the other end of the restoring coil spring 14 arranged on the axis is formed in the center of the lid body 4, and a core portion 19 is formed in the outer center of the lid body 4. A push-in operation section 20 that protrudes continuously is provided. The bellows-shaped main body 1 is housed in the holding chamber 7 of the A-form frame 6, then the lid body 4 is housed in the holding chamber 10 of the B-form frame 9, and then the coil spring 14 is fitted into the core part 19 of the lid body 4. let me,
Hold this in a horizontal position. After this, formwork A 6 and B
The formwork 9 is brought close and the opening 17 of the lid 4 is fitted into the main body side fitting part 15 of the opening of the bellows-shaped main body 1.
At this time, a certain gap is provided between the flange portion 16 of the bellows-shaped main body 1 and the flange 18 of the lid body 4.

The operation of this embodiment having the above configuration will be explained.

For welding the bellows-shaped main body 1 and the lid body 4, first, the A-form frame 6 and the B-form frame 9 are rotated at the same speed.
The bellows-like main body 1 and the lid body 4 are rotated together in a partially fitted state in this way, and the burner 11 is directed toward the peripheral end surface on the opening side of the A-form frame 6. Heated air is blown out so as to intensively heat the peripheral edge and end face of the flange portion 16. As a result, the peripheral edges and end surfaces of the flange portion 16 and the flange 18 of the lid body 4 are uniformly heated over the entire circumference, and due to the heating, the flange portion 16 begins to melt and deforms into a bead shape. When the portion begins to deform, heating of the portion by the burner 11 is stopped. Next, formwork A 6 and B
The formwork 9 is clamped and crimped with a predetermined pressure,
The welding is completed in the state shown in FIG. 4. At this time, by forming the flange portion 16 of the bellows-shaped main body 1 into an R-shaped flange 2 that is curved toward the opening direction as shown in FIG. It is raised and becomes difficult to deform.

(Effects of the invention) As described above, according to the invention, by curving the surface side of the flange portion of the bellows-shaped main body, deformation of the flange portion can be eliminated and welding with the lid body can be made uniform. This has the effect of increasing welding strength and eliminating welding defects.

[Brief explanation of the drawing]

Fig. 1 is a sectional view of the main part of a bellows type pump showing an embodiment of the present invention, Fig. 2 is a side view of the main part with the same part cut away, Fig. 3 is a sectional view of the welding process, and Fig. 4 is the welding process. The subsequent sectional view of the main part, FIG. 5, is a partially cutaway sectional view of the waist of a conventional bellows type pump. 1... Bellows-shaped main body, 4... Lid body, 16... Flange portion.

Claims (1)

[Scope of utility model registration request] a bellows-shaped main body having at least one end opened and a flange extending outward from the periphery of the opening; a lid-side opening corresponding to a main body-side fitting part formed on the opening side of the bellows-like main body; A bellows-type pump having a structure in which a lid made of synthetic resin has a flange that extends outward from the periphery of the end face of the opening and is welded to the flange portion, and is attached and welded to the fitting portion of the bellows-shaped main body. In the bellows type pump, the flange portion 16 of the bellows-shaped main body 1 is formed by being slightly curved toward the lid body 4 side.