JPH0594639U - Air duct connection structure - Google Patents

Abstract

(57) [Abstract] [Objective] The present invention relates to an air-conditioning duct connection structure, which improves the rigidity of the flange and prevents the valve from collapsing at the time of connection to prevent air leakage, and to follow the parting line. The purpose is to prevent cracking. [Structure] In an air-conditioning duct made of synthetic resin by blow molding, which is joined to the flange of the mating duct via a seal material, a longitudinally long rib for preventing cracks is formed outside along the parting line. A large-diameter portion is formed in the vicinity of the mouth end of one half-cutting portion with the bulging degree gradually increasing toward the mouth end with the parting line portion as a boundary. A flange is formed, and at the mouth end of the other half-cutting portion, an outward flange extending outwardly is formed, and the inner flange, the outward flange, and the vertical rib tip portion for preventing cracks along the parting line portion are integrated. The connection structure of the air-conditioning duct characterized by being connected to the.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a connecting structure for a synthetic resin air conditioning duct by blow molding, which is joined to a mating duct flange via a seal material.

[0002]

[Prior Art]

 6 and 7 show a conventional technique. Due to the blow ratio, the duct flange 12 formed by blow molding becomes thinner toward the outer periphery as shown in FIG. Further, as shown in FIG. 7, unevenness occurs due to cutting at the parting line portion.

[0003]

[Problems to be solved by the device]

 In the above prior art, when the flange of the mating duct is joined via the seal material, the flange 12 does not warp to the rear side like 12 'as shown by the dotted line in FIG. There was a problem that it cracked along the recess 13 of No. 7. The present invention aims to solve the above problems.

[0004]

[Means for Solving the Problems]

 In order to solve the above problems, the present invention is a blow molding synthetic resin air-conditioning duct that is joined to the flange of a mating duct via a seal material and is cracked outward along the parting line. Longitudinal ribs for prevention are formed, and a large diameter portion is formed in the vicinity of the mouth end of one of the half cut portions with the parting line portion as a boundary. An inward flange protruding from the end to the inner half circumference is formed, and an outward flange protruding to the outer half circumference is formed at the other half cutting part mouth end to prevent cracks along the inner flange, the outer flange and the parting line part. It is characterized in that it is connected integrally with the tip of the longitudinal rib.

[0005]

【Example】

 Next, an embodiment of the present invention shown in FIGS. 1 to 5 will be described. Reference numeral 1 is a duct, and as shown in FIG. 5, a longitudinal elongated rib 2 for preventing cracks is formed by a mold 10 along the parting line. A large-diameter portion 3 is formed near the mouth end of one half-cutting portion with the bulging degree gradually increasing toward the mouth end with the parting line portion as a boundary, and protrudes from the mouth end of the large-diameter portion to the inner half circumference. An inward flange 4 is formed, and an outward flange 5 projecting to the outer half is formed at the mouth end of the other half cutting part. The inward flange 4, the outward flange 5 and the longitudinal rib 2 for preventing cracks along the parting line are formed. The tip portion of is raised along the large diameter portion 3 and is integrally connected. At the time of blow molding, a sacrificial bag 6 is provided at the end of the large diameter portion 3 to provide a ventilation port, and a sacrificial bag 7 is provided at the other port end. Is formed.

At the time of joining, as shown in FIG. 3, the flanges 4 ′ and 5 ′ of the mating duct 1 ′ are pressed against each other via the seal material 11. At this time, the flanges 4 and 5 are prevented from warping by the crack-preventing elongated ribs 2 and are securely joined to the mating flanges 4'and 5 '. The seal material 11 is prevented from moving by the ridges 9 of the flanges 4 and 5 and the ridges 9'of the flanges 4'and 5 '.

[0007]

[Effect of the device]

 According to the present invention, in a blow molding air-conditioning duct made of synthetic resin, which is joined to the flange of the mating duct via a seal material, a vertical rib for preventing cracks is formed outside along the parting line. A large-diameter portion with a swelling degree gradually increasing toward the mouth end is formed near the mouth end of one half-cut portion with the parting line portion as a boundary, and the inner circumference is extended from the mouth end of the large-diameter portion. An inward facing flange is formed, and at the mouth end of the other half cutting part, an outward facing flange is formed that extends outwardly around the outer circumference, and a longitudinal rib tip is formed along the parting line and the inside flange and the outward facing flange. Since and are connected together, the following effects are obtained.

1. The outward flange and the inward flange are integrally connected to the vertical crack-preventing ribs formed on the outside along the parting line to increase the rigidity of the duct mouth end. 2. By connecting the mating ducts in a 180 ° rotating state, mutual deformations can be compensated for and air leakage can be prevented. 3. Longitudinal ribs for crack prevention along the parting line can prevent duct cracks.

[Brief description of drawings]

FIG. 1 is a front sectional view of an embodiment of the present invention.

FIG. 2 is a right side view of FIG.

FIG. 3 is an external perspective view at the time of connection.

FIG. 4 is an external perspective view showing a state with a sacrificial bag at the time of molding.

FIG. 5 is a cross-sectional view of a parting line portion during die molding.

FIG. 6 is a front sectional view of a flange portion of a conventional duct.

FIG. 7 is a sectional view of a conventional parting line portion.

[Explanation of symbols]

 1 Duct 2 Longitudinal rib for crack prevention 3 Large diameter part 4 Inward flange 5 Outward flange 11 Seal material

Claims (1)

[Scope of utility model registration request] 1. A synthetic resin air-conditioning duct made by blow molding, which is joined to a flange of a mating duct via a seal material, and has longitudinal ribs for preventing cracks formed along a parting line on the outside. A large-diameter portion is formed in the vicinity of the mouth end of one half-cutting portion with the bulging degree gradually increasing toward the mouth end with the parting line portion as a boundary. An inward flange is formed, and at the other end of the half-cut portion, an outward flange is formed to extend to the outer half circumference, and the inner flange, the outward flange, and a longitudinal rib tip portion for preventing cracks along the parting line portion. The air-conditioning duct connection structure is characterized in that they are connected together.