JPH0356715Y2 - - Google Patents

Description

[Detailed description of the invention] "Industrial application field" This invention relates to a duct connection structure in air conditioning equipment, ventilation equipment, etc.

"Prior Art" As the above-mentioned duct, a spiral duct with a circular cross section formed by spirally winding a band-like iron plate has been widely used.
In order to connect such spiral ducts, a plug joint as shown in FIG. 6 is generally used. In FIG. 6, numerals 1 and 1 are connected spiral ducts, and 2 is a plug-in joint. In order to connect the spiral ducts 1 and 1 using this plug-in joint 2, first apply a sealing material 3, 3 for preventing air leakage to the outer surface of both ends of the plug-in joint 2, and then connect both ends of the spiral duct 1 to each other. , 1 and then fixed with a plurality of tapping screws 4 . . . , and then a tape 5 is wrapped around the outside thereof.

"Problems to be Solved by the Invention" By the way, when using the above-mentioned conventional insertion joint 2, the following steps are required: applying a sealant 3, fixing with a tapping screw 4, and wrapping a tape 5. The work used to be laborious, time consuming and inefficient. In addition, skill is required to ensure the connection, and sometimes the sealing material 3 is not sufficiently applied or the tape 5 is not wrapped sufficiently, resulting in air leakage.

This invention was made in view of the above circumstances, and aims to provide a structure that allows ducts to be easily and reliably connected to each other.

"Means for Solving the Problems" This invention provides a duct connection structure in which both ducts are connected by inserting the ends of the ducts to be connected to each other into both ends of a joint, in which the joint is A cylindrical locking part whose inner dimension is larger than the outer dimension of the duct, on the outside of the central part in the longitudinal direction of the cylindrical main body whose outer dimension is slightly smaller than the inner dimension of the duct. A sealing material is provided along the entire circumference between the inner surface of the locking portion and the outer surface of the main body portion, and both ends of the locking portion are directed diagonally inward. Once bent, a locking edge is formed, while at the end of the duct to be connected,
A locking claw is provided that projects diagonally outward from the tip of the duct toward the rear, and the end of the duct is inserted into the outside of the end of the main body of the joint, thereby locking the duct. It is characterized in that the pawl and the locking edge formed on the locking portion of the joint are engaged, and the tip of the duct is buried in the sealing material.

``Example'' Below, an example of this invention is shown in Figures 1 to 4.
This will be explained with reference to the figures. Fig. 1 is a sectional view showing a state in which the spiral ducts 1 and 1 are connected by the structure of this embodiment, Fig. 2 is a sectional view of a joint 10 used in this embodiment, and Fig. 3 is a sectional view of the joint 10 used in this embodiment. A perspective view of the end of the spiral duct 1, and FIG. 4 is a partially enlarged sectional view thereof.

First, the configuration of the above joint 10 will be explained with reference to FIG. 2. This joint 10 is composed of a cylindrical main body 11 whose outer diameter is slightly smaller than the inner diameter of the spiral ducts 1, 1 to be connected, and a locking part 12 fixed to the outer surface of the main body 11. ing. The locking portion 12 has an inner diameter equal to that of the main body portion 11.
It has a cylindrical shape that is larger than the outer diameter of the main body part 11 and has a length slightly shorter than the main body part 11, and has a groove 1 in its center that bulges inward and contacts the outer surface of the main body part 11.
3 was formed. This locking part 12 is
It is fixed to the central part of the main body part 11 by a screw 14 screwed into the groove 13 from inside. As a result, a gap is secured between the outer surface of the main body part 11 and the inner surface of the locking part 12, and sealing materials 15, 15 are arranged around the entire circumference on both sides of the groove 13 within the gap. . Further, both ends of the locking portion 12 are bent diagonally inward over the entire circumference to form locking edges 16, 16, and the tips of the locking edges 16, 16 and There is a slight gap between the outer surface of the main body 11 and the outer surface of the main body 11.
As will be described later, the duct 1 is allowed to be inserted into the main body 11. It is preferable that a large number of the joints 10 having the above configuration be manufactured at a duct manufacturing factory and then transported to the site for use.

On the other hand, at the end of the spiral duct 1 to be connected, as shown in FIGS. 3 and 4, there are a plurality of locking claws 17 projecting diagonally outward from the tip side toward the rear side. They are formed at equal intervals in the direction. These locking claws 17 are formed by being punched out from the inside of the spiral duct 1 by punching and at the same time being bent diagonally.

Spiral duct 1 using the above joint 10,
1 to each other, spiral duct 1, 1
It is sufficient to insert the respective ends of the joint 10 into the outer sides of both ends of the main body 11 of the joint 10 so that their tips abut against the grooves 13. By doing this, the locking claws 17 formed at the ends of the spiral ducts 1, 1 enter inside the locking edges 16, 16, and as shown in FIG. 1, they engage. Spiral ducts 1, 1 can no longer be pulled out. Furthermore, since the tips of the spiral ducts 1, 1 are simultaneously buried in the sealing materials 15, 15, airtightness is ensured and no air leakage occurs. In addition, the locking claw 1
7... enters the inside of the locking edges 16, 16, the locking claws 17... and/or both or one of the locking edges 16, 16 are elastically deformed and the locking claws 17
... will be allowed to pass, and then the original state will be promptly restored.

As explained above, according to this structure, it is possible to connect the spiral ducts 1, 1 to each other extremely easily and reliably in the field. Therefore, unlike the case of using the conventional insertion joint 2 shown in FIG. 6, it is not necessary to screw with the tapping screw 4 or wrap the tape 5, and the work efficiency can be greatly improved. , no skill is required. Note that after the connection is made as described above, screwing or tape wrapping may be performed in the same manner as in the past, and in that case, the connection strength and airtightness can be further enhanced.

Although one embodiment of this invention has been described above, the form of the joint is not limited to the above. For example, instead of providing a groove 13 in the locking part 12 as shown in FIG. It is also possible to provide a bulging portion 18 that bulges out to the outside, and to fix the locking portion 12 to the bulging portion 18. Further, in the above description, the locking claws 17 are formed by punching, but the locking claws may be formed by attaching metal fittings to the outer surface of the duct. Other changes in design are free.

Furthermore, although the above embodiment is an example of connecting spiral ducts 1 and 1 with circular cross-sections, this invention is not applicable only to spiral ducts; The same can be applied to ducts. In that case, the main body 11 constituting the joint 10
It goes without saying that the locking portion 12 may be formed into a rectangular tubular shape corresponding to the cross-sectional shape of the duct.

"Effects of the invention" As explained in detail above, in the connection structure of this invention, the joint is provided with a locking part having a locking edge, the duct is provided with a locking claw, and these are engaged. Since the tips of the ducts are buried in the sealing material, the ducts can be connected extremely easily and reliably by simply inserting the end of the duct into the main body of the joint, which greatly improves work efficiency. It has the effect of being able to improve

[Brief explanation of drawings]

Figures 1 to 4 show an embodiment of this invention. Figure 1 is a cross-sectional view showing the state of duct connection according to the structure of this embodiment, and Figure 2 is a cross-sectional view of a joint used in this embodiment. 3 is a perspective view of the end of the duct, and FIG. 4 is a partially enlarged sectional view thereof. FIG. 5 is a sectional view showing another example of the structure of the joint. FIG. 6 is a sectional view showing a state in which ducts are connected by a conventional insertion joint. 1...Spiral duct (duct), 10...
Joint, 11... Main body part, 12... Engagement part, 15...
... sealing material, 16 ... locking edge, 17 ... locking claw.

Claims (1)

[Scope of utility model registration request] In a duct connection structure in which both ducts are connected by inserting the ends of the ducts to be connected to each other into both ends of a joint, the joint has an external dimension slightly smaller than an internal dimension of the duct. A cylindrical locking portion having an inner dimension larger than an outer dimension of the main body is provided on the outside of a central portion in the longitudinal direction of the cylindrical main body, and
A sealing material is disposed around the entire circumference between the inner surface of the locking portion and the outer surface of the main body, and both ends of the locking portion are bent diagonally inward. A locking edge is formed on the end of the duct to be connected, and on the other hand, a locking pawl is provided at the end of the duct to be connected, which projects diagonally outward from the tip side of the duct toward the rear side, and the end of the duct is connected to the By inserting it into the outside of the end of the main body of the joint, the locking pawl of the duct and the locking edge formed on the locking part of the joint are engaged, and the tip of the duct is A duct connection structure, characterized in that the duct is embedded in the sealing material.