Duct connection structure

Abstract

To provide a duct connection structure that facilitates a connection step to enable simpler connection when connecting a duct to a connection object, and further enables easy connection with a simple configuration.SOLUTION: A connection structure for connecting a ventilation duct D to a connection object C comprises a first connection pipe 1 that is arranged on the duct D having a lid part 10 on which a first threaded part 14 is formed and that is rotatably arranged, and a second connection pipe 20 arranged on the connection object C and having a second threaded part 24 formed on its outer surface, where the first connection pipe 1 and the second connection pipe 20 are positioned at a connection position, and the lid part 10 is rotated to screw the first threaded part 14 and the second threaded part 24 and connect them.SELECTED DRAWING: Figure 4

Description

Technical Field

[0001] The present invention relates to a connection structure for connecting a duct to a connection target such as a chamber.

Background Art

[0002] Regarding a mechanism for connecting a duct connection pipe and a chamber connection pipe in air conditioning equipment, Patent Document 1 discloses a mechanism for connecting with one touch.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In Patent Document 1, when the spring portion that has been elastically deformed during connection tries to return, although the user can confirm the connection state by the hitting sound when the spring portion collides with the duct connection pipe, it can be easily pulled out in the direction opposite to the connection direction after connection. However, in some cases, it may be laborious for the user because the duct connection pipe itself can be connected by being rotated.

[0005] Therefore, an object of the present invention is to facilitate the connection process and enable easier connection when connecting a duct to a connection target, and more specifically, to enable easy connection with a simple configuration.

Means for Solving the Problems

[0006] In order to solve the above problems, the duct connection structure of the present invention is a connection structure for connecting a ventilation duct to a connection target, and includes a first connection pipe arranged rotatably with a lid portion formed with a first screw portion and arranged on the connection target, and a second connection pipe arranged on the connection target and having a second screw portion formed on an outer surface portion. The first connection pipe and the second connection pipe are positioned at a connection position, and the lid portion is rotated to screw and connect the first screw portion and the second screw portion.

[0007] Further, it is preferable that the flange portion protrudes outward from the tip surface of the second connection pipe.

[0008] Further, the first connection pipe has a flange portion protruding outward between a connecting portion and an insertion portion. The connecting portion preferably connects an outer surface of the connecting portion and an inner peripheral surface of the duct in a state where a lid portion provided with an insertion hole through which the connecting portion passes through the center is inserted.

[0009] Further, the connecting portion and the insertion portion are communicating cylindrical bodies having the same inner diameter, and in a connection state between the first connection pipe and the second connection pipe, it is preferable that the insertion portion reaches inside the second connection pipe.

Advantages of the Invention

[0010] According to the invention described in claim 1, the first connection pipe arranged on the duct and the second connection pipe arranged on the connection object can be connected or disconnected by rotating the lid portion, and it is possible to connect the duct, which is a connection object, to the connection target with a simple configuration and a simple process. In particular, it is possible to save labor for the user during construction rather than rotating the duct itself.

[0011] According to the invention described in claim 2, since the flange portion is positioned higher than the tip surface of the second connection pipe, the screwing of the screw portion proceeds by rotating the lid portion, and by bringing the tip surface of the second connection pipe into contact with the flange portion, it can be used as a stopper for completing the screwing.

[0012] According to the invention described in claim 3, a lid that can be rotated with a simple structure can be attached to the first connecting pipe and the duct, and it becomes possible to provide a duct connection structure that can achieve labor saving with a simple structure.

[0013] According to the invention described in claim 4, the insertion part of the first connecting pipe reaches inside the second connecting pipe. When blowing air from the duct of the object to be connected to the object to be connected in the connected state, it is possible to blow air directly to the second connecting pipe. Not only can leakage due to connection be eliminated, but it also becomes possible to easily perform positioning in the temporarily connected state in the connection process.

Brief Description of the Drawings

[0014]

Figure 1

Figure 2

Figure 3

Figure 4

Embodiments for Carrying Out the Invention

[0015] An example of an embodiment of the present invention will be described with reference to FIGS. 1-4. In this description, the axial direction is the direction connecting the center of the circle of the first connecting pipe 1 and the second connecting pipe 20, which is the direction indicated by the arrow line X in FIG. 1. Also, in this description, the outer side refers to the direction from the center of the circle of the cylindrical connecting pipe to the outside, and the inner side refers to the opposite side.

[0016] As shown in Fig. 1, the connection structure of a duct used for blowing a gas as air conditioning equipment is a connection structure for connecting a chamber box C and a duct D. Conventionally, various connection structures between the chamber box C and the duct D have been provided, but connection structures using leaf springs and the like have imposed a great deal of labor on users. The places where the duct D is used range from large buildings to low-rise buildings such as houses, and in the latter case, there are relatively few restrictions on the use of fire protection equipment. When used in such places, the duct D is often of a small diameter type, and a form in which the duct D can be connected to the chamber box C by a simpler method is preferred.

[0017] This embodiment is for connecting a duct D, which is a connecting object, to a connection target with a simple configuration and process. The connection target in this embodiment will be described as the chamber box C. However, the connection target is not limited to the chamber box C and may be a second duct. For example, when the second duct, which is the connection target, has a different diameter from the duct D, which is the connecting object (the first) duct, it is necessary to connect the two ducts. Even in such a case, the connection structure of this embodiment can be used.

[0018] This embodiment will be described with reference to Figs. 1-4. First, the first connecting pipe 1 (duct connecting pipe) used for the duct D, which is the connecting object, has a substantially cylindrical connecting portion 2, an insertion portion 3, and a flange portion 4 that protrudes outward between the connecting portion 2 and the insertion portion 3. The inside is hollow, and a series of ventilation paths 5 are formed. The connecting portion 2 and the insertion portion 3 of the first connecting pipe 1 are a series of cylindrical objects with the same outer diameter and inner diameter, and both have a thickness at the tip portion. In this embodiment, the axial length from the flange portion 4 is the same for both the connecting portion 2 and the insertion portion 3, but the insertion portion 3 may be shorter or have other dimensions.

[0019] The connecting portion 2 will be described. The connecting portion 2 is a portion that connects to the duct D which is a connecting object. Specifically, an adhesive is applied to the outer surface of the connecting portion 2 and inserted into the inner diameter of the duct D, and the duct D is connected by the adhesion of the adhesive. In this case, as a supplement, a metal band may be wound around from the outside of the connecting position, or screws or the like may be driven in for connection. The connecting portion 2 is connected to the duct D by an adhesive layer formed by these adhesives and connecting members such as bands.

[0020] The connection of the connecting portion 2 of the present embodiment to the duct D does not reach up to the flange portion 4 protruding outward. A buffer material 6 made of resin packing is arranged along the protruding flange portion 4 between the duct D and the flange portion 4, and further, with a lid portion 10 arranged on the duct D side of the buffer material 6, it is connected to the duct D. The buffer material 6 is an annular shape having an inner diameter substantially the same as the outer diameter of the connecting portion 2, and the lid portion 10 also has an insertion hole 11 having an inner diameter substantially the same as the outer diameter of the connecting portion 2 as described later. Therefore, the buffer material 6 is arranged on the connecting portion 2 so as to contact the flange portion 4, and further, the lid portion 10 is arranged on the duct D side thereof, and the duct D is connected. By arranging the lid portion 10 so as to be sandwiched between the flange portion 4 (buffer material 6) and the duct D in this way, it becomes possible to arrange the lid portion 10 rotatably on the first connection pipe 1 with a simple configuration. It should be noted that a minute gap is preferably provided between the lid portion 10 and the duct D or the buffer material 6 to make the rotation of the lid portion 10 easier. By this connection, the connection opening 2a of the connecting portion 2 reaches the inner diameter of the duct D.

[0021] Next, the flange portion 4 has a form that protrudes in the circumferential direction from the outer periphery of the first connection pipe 1, and it is preferable that the protruding height is the same as the outer surface portion 23 of the second connection pipe 20 described later or protrudes more than the outer surface portion 23 of the second connection pipe 20 (see FIG. 4). By having such a protruding height, not only can the above-described lid portion 10 be arranged rotatably, but also it becomes possible to serve as a stopper in the connection with the second connection pipe 20.

[0022] Further, the insertion part 3 is a cylindrical body having the same outer diameter and inner diameter as the connecting part 2 as described above. The outer diameter of the insertion part 3 is smaller than the inner diameter of the second connecting pipe 20, and when the first connecting pipe 1 is in a connected state or a temporarily connected state to the second connecting pipe 20, the tip opening surface 3a of the insertion part 3 reaches inside the second connecting pipe 20.

[0023] Next, the lid part 10 will be described. The lid part 10 includes an annular part 12 extending outward from the central insertion hole 11, and a cylindrical part 13 extending in the axial direction from the outer side of the annular part 12 toward the second connecting pipe 20. The protruding height of the annular part 12 outward is higher than the protruding height of the flange part 4, and when arranged on the connecting part 2, the cylindrical part 13 reaches the side of the second connecting pipe 20 more than the flange part 4.

[0024] A first screw part 14 protruding further inward from the inner peripheral surface is formed on the cylindrical part 13 of the lid part 10. The first screw part 14 is formed to be screwed with a second screw part 24 of the second connecting pipe described later. Also, it is preferable that the protruding width of the first screw part 14 is such that the inner circumference at the tip position of the screw is the same as or approximately the same as the outer circumference of the flange part 4. Further, the lid part 10 has a knurling process on the outer peripheral surface of the cylindrical part 13, and for example, by uniformly providing protrusions along the peripheral edge, it plays a role of anti-slip.

[0025] Next, the second connecting pipe 20 provided in the chamber box C to be connected will be described. The second connecting pipe 20 is a cylindrical member having a tip surface 21 protruding from the chamber box C, and the inside 22 serves as a ventilation path and communicates with the inside of the chamber box C. In the present embodiment, the rear end 25 of the second connecting pipe 20 protruding outward in a flange shape is arranged to reach the inner surface of the chamber box C. Note that the chamber box C may be a hollow box body, a cylindrical body, etc., but in the present invention and the drawings, only the wall surface around the chamber connection pipe 2 of the chamber box 1 is shown, and the others are omitted.

[0026] A second threaded portion 24 is formed on the outer surface portion 23 of the second connecting pipe 20. The second threaded portion 24 of the second connecting pipe 20 is formed to protrude from the tip side in the protruding direction (axial direction) to the vicinity of the center, and is formed such that the thread protrudes outward. Note that the axial arrangement range of the first threaded portion 14 and the second threaded portion 24, the height of the thread, etc. are not limited to this embodiment.

[0027] Both the lid portion 10 and the second connecting pipe 20 of this embodiment are thread-cut, and resin-made ones are used for ease of manufacture including the first connecting pipe 1. However, it is not limited to such resin-made products, and metal-made ones may be used in consideration of fire prevention.

[0028] The connection between the first connecting pipe 1 and the second connecting pipe 20 will be described. The insertion portion 3 of the first connecting pipe 1 connected to the duct D is made to enter so as to be accommodated in the interior 22 of the second connecting pipe 20. In this state, the first threaded portion 14 of the lid portion 10 of the first connecting pipe and the second threaded portion 24 of the second connecting pipe 20 come into contact. This position becomes the temporary connection position. Even at this temporary connection position, since the insertion portion 3 of the first connecting pipe 1 reaches the interior of the second connecting pipe 20, the user can easily position it when rotating the lid portion 10 to complete the connection.

[0029] Next, when the user rotates the cylindrical portion 13 of the lid portion 10 externally mounted on the first connecting pipe 1, the first threaded portion 14 and the second threaded portion 24 are screwed together. As the screwing of the first threaded portion 14 of the first connecting pipe and the second threaded portion of the second connecting pipe 20 progresses and the tip surface 21 of the second connecting pipe 20 abuts against the flange portion 4, the flange portion 4 serves as a stopper and the connection is completed. In the connected state, the lid portion 10 is sandwiched in the axial direction by the duct D and the flange portion 4, and the first connecting pipe 1 is configured to be sandwiched vertically by the lid portion 10 and the second connecting pipe 20, and the connected state is fixed.

[0030] Although not shown, as an auxiliary, a tape or the like may be wound around the tip portions of the second connecting pipe 20, the lid portion 10, the first connecting pipe, and the duct D in the connected state to perform reinforcement for maintaining the connected state.

[0031] When disconnecting the connection from the connected state, remove the auxiliary reinforcing tape or the like, and rotate the lid portion 10 in the direction opposite to the direction in which it was rotated to the connected state. Then, the screwing between the first screw portion 14 of the lid portion 10 and the second screw portion 24 of the second connection pipe 20 is released, and the connection between the duct D of the object to be connected and the chamber box C of the object to be connected is released.

[0032] As described above, the conventional one-touch connection uses a leaf spring or the like, and it was necessary to rotate the entire duct in connection and disconnection. However, in this embodiment, it is possible to perform connection and disconnection by rotating only the lid portion 10. Further, if a member provided with screw portions 14 and 24 is used, it is possible to perform connection with a simple configuration.

[0033] The above is an embodiment of the present invention. As other embodiments, the front insertion portion 3 may protrude shorter from the flange portion 4 of the first connection pipe 1 than in the first embodiment, or the insertion portion 3 itself may not be provided. As long as the lid portion 10 is rotatably provided by the flange portion 4 and the first connection pipe 1 and the second connection pipe 20 can be connected with a simple configuration, other embodiments may be used.

Explanation of Reference Numerals

[0034] 1... First connection pipe, 2... Connecting portion, 3... Insertion portion, 4... Flange portion, 5... Ventilation path, 6... Buffer material, 10... Lid portion, 11... Insertion hole, 12... Annular portion, 13... Cylindrical portion, 14... First screw portion, 20... Second connection pipe, 21... Front end face, 22... Inside, 23... Outer surface portion, 24... Second screw portion, 25... Rear end, C... Chamber box, D... Duct.

Claims

1. A connection structure for connecting a ventilation duct to a connection object, a first connection pipe arranged in the duct, the first connection pipe having a rotatably disposed cover portion on which a first screw portion is formed; and a second connection pipe arranged in a connection object, the second connection pipe having a second screw portion formed on an outer surface portion thereof, A duct connection structure, characterized in that the first connecting pipe and the second connecting pipe are positioned in a connection position, and the cover portion is rotated to screw together the first threaded portion and the second threaded portion to connect them.

2. 2. The duct connection structure according to claim 1, wherein the flange portion protrudes outward from a tip end surface of the second connection pipe.

3. The first connecting pipe has a flange portion that protrudes outward between the coupling portion and the insertion portion, The duct connection structure according to claim 2, characterized in that the connecting portion connects an outer surface of the connecting portion to an inner surface of the duct by inserting a lid portion having an insertion hole in the center through which the connecting portion passes.

4. The connecting portion and the inserting portion are cylindrical bodies having the same inner diameter, 4. The duct connection structure according to claim 3, wherein, in a connected state between the first connecting pipe and the second connecting pipe, the insertion portion reaches an inside of the second connecting pipe.

Images