JPH0447544Y2 - - Google Patents

Description

[Detailed description of the invention] Industrial application field This invention relates to a joint device for a movable air duct for forming an air flow path between two members that perform relative reciprocating motion in parallel to each other within a fixed movement stroke. .

Prior Art There are cases where it is desired to form an air flow path between two members that perform relative reciprocating motion parallel to each other within a certain movement stroke. However, in the following description, for the sake of simplicity, one of the two members will be referred to as a fixed side member, and the other will be referred to as a movable duct.

The most common method used in such cases is
A flexible cylinder such as a bellows or hose is used to connect two members. This thing has a cylindrical body,
Since the connecting portions at both ends can be easily made airtight, they can be sufficiently applied to forming an airtight air flow path between two members.

As for the performance required of the air flow path in such cases, there are many cases where it is acceptable even if there is some degree of airtightness. For example, like pneumatic cotton collecting devices often used in spinning machines, etc.
When using a suction blower to create negative pressure and flow a large amount of air to capture and accumulate fluff, etc.
Even if there is a slight airtightness defect in the air flow path on the suction side, the effect on the cotton collection performance of the device is negligible.

Problems to be Solved by the Invention When using the above-mentioned conventional technology, it is essential to provide a space between the two members for the connecting member such as a bellows or hose to flex, and it is necessary to provide space between the two members when the two members are very close together. Therefore, there was a problem in that it could not be applied at all if such a space could not be secured.
In particular, when the amount of air flowing through the air flow path is large, the required ventilation cross-sectional area of the connecting member is also large, so securing this space is not necessarily easy.

Therefore, in view of the actual state of the prior art, the purpose of this invention is to interpose a sliding member between the fixed side member and the movable duct, and to make sure that the respective ventilation holes and cross sections have a required ventilation cross-sectional area. By overlapping without overlapping, it allows relative parallel movement between the two members in cases where strict airtightness is not required, and allows air flow between the two members even if there is no large spatial space. An object of the present invention is to provide a new joint device for a movable air duct, which can form a duct.

Means for Solving the Problems The configuration of this invention to achieve the above object includes a sliding member between the flat surface of the fixed side member and the flange of the movable duct that reciprocates in parallel to this flat surface. The gist is that the shape of the ventilation hole is determined so that the overlapping area of the intervening ventilation hole formed on the flat surface and the cross section of the movable duct does not become less than the required ventilation cross-sectional area.

In this configuration, since the sliding member is interposed between the flat surface of the fixed member and the flange of the movable duct, the movable duct does not touch the flat surface of the fixed member. Even if they move back and forth in parallel, there is no risk that the airtightness between them will be extremely broken. In addition, even if the movable duct moves, the cross section of the movable duct and the ventilation hole of the fixed side member will have an overlapping area that will not be less than the required cross-sectional area, so the air flow path will not be restricted more than necessary. Therefore, there is no risk of excessive flow path resistance.

It works as described above.

Example Examples will be described below with reference to the drawings.

The movable air duct joint device includes a fixed side member 10
and the flange 21 of the movable duct 20.
A sliding contact member 30 is interposed between the two (FIG. 1).

The fixed side member 10 is a hollow box-shaped member having a long hole-shaped ventilation hole 12 on its flat surface 11.

The movable duct 20 is an air duct having a circular cross section 22, and has a flange 21 on its end surface.
is formed. The circular cross-section 22 is selected to have an effective cross-sectional area that is compatible with the air flow rate passing through the movable duct 20. The movable duct 20 is assumed to reciprocate in parallel to the flat surface 11 of the fixed side member 10 with a movement stroke d (arrow K in the figure).

The sliding contact member 30 is, for example, a sheet made of a synthetic resin with excellent wear resistance such as nylon/Teflon (trade name of Dupont), and is cut to the same size as the flange 21 of the movable duct 20, and then Duct 2
A through hole 31 of the same size as the cross section 22 of 0 is provided in the center,
It is assumed that the through hole 31 is attached to the lower surface of the flange 21 so that it matches the cross section 22.

These members are attached to the flange 2 of the movable duct 20.
The sliding member 30 attached to the fixed member 10 contacts the flat surface 11 of the stationary member 10, and is assembled in such a manner that the sliding member 30 can slide on the flat surface 11 (FIG. 2). At this time, the ventilation hole 1 of the fixed side member 10
2 is a long hole that matches the circumferential envelope of the cross section 22 of the movable duct 20 that moves reciprocally with a movement stroke d (Fig. 3), and
The flange 21 and the sliding member 30 are connected to the movable duct 2
It is assumed that the size is selected to be sufficient to cover the ventilation hole 12 for a total movement stroke d of 0.

In the movable air duct coupling device having such a configuration, the cross section 22 of the movable duct 20 is maintained at any position within the movement stroke d.
Since the overlapping area of the fixed side member 10 and the ventilation hole 12 (referring to the area of the portion where the cross section 22 and the ventilation hole 12 overlap; the same applies hereinafter) remains unchanged, even if the movable duct 20 moves, the movable duct 20 remains unchanged. The flow path resistance at the joint between the duct 20 and the stationary member 10 can also be kept constant. In addition, the airtightness between the two
Since the sliding contact member 30 functions as a kind of packing, it can be maintained in good condition as long as it does not wear out. Note that the direction of air flow between the movable duct 20 and the fixed side member 10 is not particularly limited.

Other embodiments The sliding contact member 30 is attached to the flange 2 of the movable duct 20.
Instead of the sheet attached to the fixed member 10, it may be a ring-shaped member attached to the periphery of the ventilation hole 12 of the stationary member 10 (FIG. 4). Alternatively, it may be an O-ring-shaped member that is attached to the groove 13 formed along the entire circumference of the ventilation hole 12 of the stationary member 10 (FIG. 5). However, here, the sliding contact member 30 protrudes in an annular shape onto the flat surface 11 of the fixed side member 10, and the lower surface of the flange 21 of the movable duct 20 is Assume that there is uniform sliding contact. In addition, in these embodiments, the sliding contact member 30 may be attached to the movable duct 20 side instead of the fixed side member 10 side.

Cross section 22 of movable duct 20 and fixed side member 10
The shapes and related dimensions of the vent holes 12 are such that the overlapping area of the two within the movement stroke d of the movable duct 20 is not less than a predetermined required ventilation cross-sectional area that is compatible with the air flow rate passing through the movable duct 20. (Article 6)
figure). For example, Figure A shows a case where the cross section 22 is large enough to allow a sufficient margin, so that the movement stroke d can be taken to the outside of the ventilation hole 12 of the same shape and size. B is further
When the movement stroke d is allowed to be particularly large by making the ventilation hole 12 a long hole, C in the same figure is
A case is shown in which the cross section 22 and the ventilation hole 12 are changed to square holes.

Further, the reciprocating direction of the movable duct 20 may be at any angle θ other than right angles with respect to the longitudinal direction of the movable duct 20 as long as it is parallel to the flat surface 11 of the fixed side member 10. (Figure 7).

The fixed side member 10 may be a duct-like member having a flange 14 sufficient to provide a predetermined ventilation hole 12 instead of a hollow box-like member (FIG. 8). At this time, the cross section 16 of the fixed side member 10
is smaller than the ventilation hole 12, the reducer portion 15 is interposed between the ventilation hole 12 and the cross section 16.

Effects of the invention As explained above, according to this invention, a sliding member is interposed between the flat surface of the fixed side member and the flange of the movable duct that reciprocates in parallel thereto,
By determining the shape of the ventilation hole so that the overlapping area between the ventilation hole formed on the flat surface and the cross section of the movable duct is not less than the required ventilation cross-sectional area, the area between the fixed side member and the movable duct is Since only a sliding contact member is interposed, an air flow path can be formed between the two without requiring any special space, which is an excellent effect.

[Brief explanation of the drawing]

1 to 3 show an embodiment; FIG. 1 is an exploded perspective view, FIG. 2 is an assembled vertical cross-sectional view, and FIG. 3 is an operational state view. 4 and 5 are schematic diagrams corresponding to FIG. 2, respectively, showing another embodiment. 6A to 6C are views corresponding to FIG. 3, respectively, showing still another embodiment. 7th
8 and 8 respectively show a fourth embodiment showing another embodiment.
It is a figure equivalent figure. d...Movement stroke, 10...Fixed side member,
11...Flat surface, 12...Vent hole, 20...Movable duct, 21...Flange, 22...Cross section, 30
...Sliding contact member.

Claims (1)

[Scope of utility model registration request] A sliding member is interposed between a flat surface of the fixed side member and a flange of a movable duct that reciprocates in parallel with the flat surface, and a ventilation hole is formed in the flat surface within the movement stroke of the movable duct. A joint device for a movable air duct, wherein the shape of the ventilation hole is selected so that an overlapping area between the cross section of the movable air duct and the cross section of the movable duct does not become less than a required ventilation cross-sectional area.