JPS5872792A - Connector of ventilating duct for air conditioning - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] This relates to a duct connection device, and its purpose is to seal and fix the duct without using a separate sealing material such as urethane, improve sealing performance, and reduce man-hours and cost. The goal is to measure the down content and make it even more effective in preventing vibrations and sound.

Conventionally, as shown in FIGS. 1 and 2, a seal of urethane or the like is adhesively fixed to the inner surface of the end of the exhaust duct 1, and the tip of the intake duct 8 is fitted into it, or Alternatively, as shown in Fig. 3, it has been considered to improve the sealing effect by providing an annular protrusion 4a on the outer peripheral surface of the intake duct 4, but since a separate sealing material such as urethane is used, the number of man-hours increases and the cost increases. It had the disadvantage of being expensive.

The present invention provides a bellows at the duct connection part without using a separate sealing material, and utilizes its elasticity to seal and fix the duct, thereby eliminating the conventional drawbacks.

4 to 7 show a first embodiment of the present invention, in which a multi-annular uneven portion 11 with a wave-shaped cross section and a pitch of P is formed at the end of the intake duct 10, and the end of the exhaust duct 12. A bellows portion 18 with a pitch P2 is formed at. Then, it becomes P,)P2.

When inserting the intake side duct) 10 into the exhaust side duct) 12, the tip l8α of the elastic bellows portion l8 is pulled and expanded, and the inner apex 1875 of the bellows portion 13 is shaped into a polycyclic unevenness with a wave-shaped cross section. Move along the outer surface of lO as shown in Figure 7, and
As shown in the figure, the inner apex l8h is fitted and locked into the outer valley lOα of the multi-annular uneven portion 10. bellows belly]. When you release your hand from 3, the bellows portion 13 has elasticity that tends to shrink, and the inner top portion 13b
is pressed into contact with the outer valley lOα from the side and is fixed and sealed at the same time. At this time, if the pitch of the bellows portion 13 is P3, then P1≧P3>P2.

Room 14 is vacant.

8 to 10 show a second embodiment of the present invention, in which a polyannular uneven portion 21 with a pitch P1 and a wave shape in cross section is formed at the end of the intake duct 20 at an angle θ with respect to the axial direction, and Duct 22
A bellows portion 28 with a pitch P2 is formed at an angle θ2 with respect to the axial direction. and p, > p2. θ1>θ2. Room 24 is vacant.

In this second embodiment, when the distal end 28a of the bellows portion 23 is pulled and expanded and engaged with the multi-annular concavo-convex portion 21, the engagement is easy because θ1>θ2.

According to the present invention, a bellows portion formed at the end of the exhaust side duct is inserted and locked onto the outer surface of the multi-annular uneven portion having a corrugated cross section formed at the end of the intake side duct while being extended, without using a separate sealing member. The overall structure and connection work are simple, and the tops of the inner surfaces of the bellows parts come into pressure contact at several locations, resulting in good sealing. By making the connection part long, it can be bent at the connection point, and Since the connection is made using the elasticity of the bellows part, there is little loosening, and since a plurality of spaces are formed in the connection part, it is effective for vibration and sound insulation.

[Brief explanation of the drawing]

Fig. 1 is a perspective view of a conventional first comparative example before connection, Fig. 2 is a front cross-sectional view of the same, Fig. 3 is a front cross-sectional view of a conventional second comparative example before connection, and Fig. 4 is the invention according to the present invention. FIG. 5 is a front sectional view of FIG. 4, FIG. 6 is an exploded front view of FIG. 5, FIG. 7 is a front sectional view of FIG. 6 during connection, and FIG. The figure is a perspective view of a second embodiment of the present invention, FIG. 9 is a front sectional view of FIG. 8, and FIG. 1O is an exploded front sectional view of FIG. 9. 10.20...Intake side duct, 11.21...Multi-annular uneven portion, 12.22...Exhaust side duct, 13゜23
...A bellows belly. Figure 1 Figure 2 Figure 3 Figure 4 Figure 7

Claims (1)

[Claims] A polycyclic uneven portion having a wave-shaped cross section is formed at the end of the duct on the intake side, a stretchable bellows portion having a pitch shorter than the pitch of the uneven portion is formed at the end of the duct on the exhaust side, and a bellows portion is formed on the outer periphery of the polycyclic uneven portion. Connection device for air conditioning ventilation ducts that fit together.