JPH0587386U - Air duct connection structure - Google Patents

Abstract

(57) [Summary] [Purpose] Along with simplifying the work of installing the sealing material attached to the end of the air conditioning duct and facilitating the recycling of the duct body, it is also used as a parting line for air conditioning ducts manufactured by blow molding. A connection structure for an air conditioning duct that secures the strength of a crushed portion along the line. [Structure] Male duct obtained by blow molding synthetic resin
A pair of locking hooks (2, 2) are projected on the parting line part of the seal material winding part of the connection part of (1), and a longitudinal rib (2) is formed along all parting lines except the connection part. 3,
3) forming the locking hooks (2,2) on at least both ends
A sealing material (4) having a hole (5) that can be engaged with is wound around the mouth end of the connecting portion of the male duct (1) and both ends thereof are overlapped, and the both holes (5, 5 ) Is engaged with one of the locking hooks, and in this state, the connecting portion of the male duct (1) is fitted into the female duct (7).

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an air-conditioning duct connection structure. Specifically, it simplifies the work of installing a sealing material that is attached to the end of the air-conditioning duct and facilitates the recycling of the duct body, and at the same time, improves the air-conditioning duct manufactured by blow molding. The present invention relates to a connection structure for an air conditioning duct that secures the strength of a crushed portion along a parting line.

[0002]

[Prior Art]

 As shown in FIG. 6, the structure of the connecting portion in the conventional air-conditioning duct is such that the connecting portion of the male duct 1'is simply a cylindrical shape, and the double-sided adhesive tape 8 is attached to the entire outer surface of the cylindrical connecting portion. The attached sealing material 4'of, for example, foamed polyurethane resin is wound, and this is fitted and connected to a female duct (not shown).

By the way, in an air-conditioning duct manufactured by conventional blow molding, as shown in FIG. 7, a synthetic resin parison in a molten state at the time of duct molding is clamped by a mold 6 ′ from the left and right along a parting line PL. The crushed portion of the molded duct 1'is not only thinner than other portions but also a welded portion because it is crushed and welded and cut at that portion. Along the edge of the crushed portion, cracks tend to occur at the crushed portion, especially at the edges.

[0004]

[Problems to be solved by the device]

 Therefore, according to the connection structure of the male duct 1'shown in FIG. 6, the sealing material 4'is attached to the end peripheral surface of the male duct 1'when connecting the end portions of the air conditioning duct. Not only does this work require skill, but the number of man-hours increases, and the cost is high because the double-sided adhesive tape 8 having the same area as the sealing material 4'is required. In addition, since the duct body and the sealant are strongly adhered and integrated, it was not possible to separate the two easily even if an attempt was made to recycle the duct, and efficient collection was impossible.

Furthermore, as described above, in the air conditioning duct manufactured by the conventional blow molding, as shown in FIG. 7, a thin portion is generated along the parting line PL, and that portion becomes fragile, especially at the end portion. The structure is such that the part breaks easily.

The present invention was developed to solve the above problems all at once. The purpose of the present invention is to facilitate the work of connecting the air-conditioning duct and to reuse the waste materials. Another object of the present invention is to provide a connection structure for an air conditioning duct, which improves the strength of the crushed portion.

[0007]

[Means for Solving the Problems]

 In order to achieve such an object, the present invention provides a pair of locking hooks projecting on the parting line part of the seal material winding part of the connection part of the male duct obtained by blow molding of synthetic resin, A longitudinally extending rib is formed along all the parting lines except the part, and a sealing material (4) having holes (5) at least at the start end and the end capable of engaging with the locking hooks (2, 2) is provided. The male duct (1) is wound around the mouth of the connecting part and both ends are overlapped with each other, and one of the pair of locking hooks (5) is attached to the both hole parts (5, 5). The main structure is the connection structure of the air conditioning duct, which is characterized in that the connection part of the male duct is fitted into the female duct in this state.

[0008]

[Action]

 When connecting the male and female ducts, wrap them around the outer peripheral surface of the male duct connection so that both ends of the sealing material overlap, and make holes at least at both ends of the sealing material. The male and female ducts can be installed without skill by simply attaching the same locking hooks of the male ducts to the parts, and then fitting the connecting end to the female ducts. Secure and easy connection. Further, since the double-sided adhesive tape is not used as the sealing material at all, it is easy to handle and advantageous in terms of cost.

When removing both ducts, the male duct is pulled out from the female duct, and the ends of the sealing material wound around the connecting portion of the male duct are removed from the respective locking hooks, and the male duct is removed. Since the sealing material is completely and easily separated, recycling of the duct is easy.

Further, since vertical ribs are formed in the parting line parts of both ducts over the entire length except the connecting part of the male duct, the locking hook causes cracks in the parting line part of the connecting part. Not only does it make it less likely to occur, but it also secures sufficient strength in other parting lines to prevent damage.

[0011]

【Example】

 Hereinafter, embodiments of the present invention will be specifically described with reference to the drawings. 1 is a perspective view for explaining a connection structure of an air conditioning duct showing a first embodiment of the present invention, FIG. 2 is a longitudinal sectional view of a connection portion of the air conditioning duct, and FIG. 3 is a cross section of the connection portion. It is a plan view.

[0012] A pair of locking members each having a substantially T-shaped tip are engaged with a parting line portion of a sealing material winding portion of a connecting end portion of a male duct 1 obtained by blow molding a synthetic resin of the present invention. The hooks 2, 2 are projected on the same outer circumference with a phase difference of 180 ° with the hook direction facing the circumferential direction. In addition, long vertical ribs 3 are formed over the entire length of the parting line portion other than the connecting end portion to secure the strength of the parting line portion of the male duct 1.

To blow-mold the male duct 1 having the above structure, a parison is inserted into a mold in an open state, and a part of the parison along the lengthwise direction is sandwiched, as in normal molding. Thus, the mold 6 is closed, and then the compressed fluid is fed into the mold and the parison is molded in a heated and molten state. The mold cavity has a cylindrical shape as shown in FIG. 5 and a shape in which the locking hooks 2 and 2 are formed on the line of the parting line PL at the connecting portion of the male duct 1 with a phase difference of 180 °. Has been done. Although not shown, the entire length of the parting line P.L other than the connecting portion has a rib forming portion for forming the vertically long rib 3 shown in FIG.

On the other hand, the seal member 4 attached to the connecting portion of the male duct 1 has a length longer than the outer peripheral length of the male duct 1 and has a length such that the end portions of the male duct 1 overlap each other in a predetermined length portion. In this embodiment, holes 5 which can be engaged with the pair of locking hooks 2 are formed at the start end, the end and the middle.

The locking hook 2 formed on one parting line portion of the male duct 1 configured as described above is inserted into and engaged with the hole portion 5 formed in the middle portion of the sealing member 4, The sealing material 4 is wound around the connecting portion of the male duct 1, and the both end portions of the sealing material 4 are overlapped with each other, and the hole portions 5 and 5 formed at the end portions have a substantially T-shaped cross section. The other locking hooks 2 on the other side are engaged as shown in FIGS. 3 and 4. In this state, as shown in FIG. 1, the connecting portion of the male duct 1 is fitted into the female duct 7 to complete the connection.

[0016]

[Effect of the device]

 According to the present invention, when connecting the male and female ducts as described above, the sealing material is wound around the outer peripheral surface of the connecting portion of the male duct so that both ends of the sealing material are overlapped. It is a simple work that involves engaging the hooks of the male duct with the holes formed at least at both ends of the male duct, and then fitting the connecting ends of the male duct to the female duct, which requires skill. The male and female ducts can be connected securely and easily without any trouble. Moreover, since double-sided adhesive tape is not used as the sealing material at all, it is easy to handle and advantageous in terms of cost.

To remove both ducts, simply pull out the male duct from the female duct and remove the ends of the sealing material wound around the connection part of the male duct from the respective locking hooks. Duct recycling is easy because the sealant is completely and easily separated.

Furthermore, since the longitudinal ribs are formed in the parting line portions of both ducts over the entire length except the connecting portion of the male duct, the locking hooks cause cracks in the parting line portion of the connecting portion. Not only is it less likely to occur, but sufficient strength is secured in other partitioning line parts as well, and damage etc. is eliminated.

[Brief description of drawings]

FIG. 1 is an exploded perspective view showing a structure of a connecting portion of an air conditioning duct which is a typical embodiment of the present invention.

FIG. 2 is a vertical sectional view showing a connected state of the duct.

FIG. 3 is a cross-sectional view showing a connected state of the duct.

FIG. 4 is an enlarged cross-sectional view showing a state in which a sealing material is attached to a connecting portion of a male duct.

FIG. 5 is a partial cross-sectional view showing a die structure of a parting line portion in a connection portion of a male duct.

FIG. 6 is a vertical cross-sectional view showing a connected state in a conventional air conditioning duct.

FIG. 7 is a partial cross-sectional view showing a conventional mold structure of a parting line portion.

[Explanation of symbols]

 1,1 'Male duct 2 Locking hook 3 Longitudinal rib 4,4' Sealing material 5 Hole 6,6 'Mold 7 Female duct 8 Double-sided adhesive tape

Claims (1)

[Scope of utility model registration request] 1. A pair of locking hooks (2, 2) are projected on a parting line part of a sealing material winding part of a connecting part of a male duct (1) obtained by blow molding a synthetic resin. , Longitudinal ribs (3, 3) are formed along the entire parting line except the connecting portion, and at least the start end and the end have holes (5) capable of engaging with the locking hooks (2, 2). Sealing material
(4) is wound around the mouth of the connecting part of the male duct (1) and both ends are overlapped with each other, and one of the pair of locking hooks (5) is fitted into the both hole parts (5, 5). A connection structure for an air conditioning duct, characterized in that the connection portion of the male duct (1) is fitted to the female duct (7) in this state.