Connection structure for duct connection pipe

Abstract

To provide a connection structure for a duct for reducing labor when removing the duct therefrom while maintaining snapping sound during connection between a duct connection pipe and a chamber connection pipe.SOLUTION: A connection structure is provided for connection between a chamber connection pipe 2 and a duct connection pipe 10. The duct connection pipe 10 has a first hole part 11 opened in the peripheral face, and the chamber connection pipe 2 has a second hole part 5 opened in the peripheral face at its position corresponding to the first hole part 11, and a spring part 6 arranged on the inner peripheral face. The spring part 6 has a base end 6a joined to the inner peripheral face of the chamber connection pipe 2, and a projection part 6d provided so as to project therefrom / retract thereinto through the second hole part 5 and the first hole part 11 in the state of connection between the chamber connection pipe 2 and the duct connection pipe 10. The projection part 6d projects therein while being further pushed from a connection position of the duct.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a connection structure between a duct connecting pipe and a chamber connecting pipe. [Background technology]

[0002] The applicant has filed an application for Patent Document 1 for a mechanism for connecting a duct connection pipe and a chamber box in an air conditioning system with one touch, which allows the user to check the connection state. In this document, a spring part is elastically deformed, and when the spring part protrudes from a hole part to return to its original position, the spring part hits the duct connection pipe, making a clicking sound, allowing the user to check the connection state. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Utility Model Registration No. 3240559 Summary of the Invention [Problem to be solved by the invention]

[0004] However, in this document, in order to pull out the duct, it is necessary to rotate the duct to release the engagement of the spring portion, and since rotating the duct requires a lot of effort, there has been a demand for labor-saving measures.

[0005] Therefore, an object of the present invention is to provide a duct connection structure that maintains the clicking sound when connecting the duct connecting pipe and the chamber connecting pipe, while reducing the effort required when removing the duct. [Means for solving the problem]

[0006] In order to solve the above problems, there is provided a connection structure for connecting a chamber connecting pipe and a duct connecting pipe, comprising: the duct connecting pipe has a first hole portion opened on a circumferential surface, the chamber connecting pipe has a second hole portion that opens at a position corresponding to the first hole portion on a circumferential surface thereof, and a spring portion that is disposed on an inner circumferential surface thereof; the spring portion has a base end portion joined to an inner circumferential surface of the chamber connecting pipe, and a protruding portion that is capable of protruding and retracting through the second hole portion and the first hole portion in a state in which the chamber connecting pipe and the duct connecting pipe are connected, The protrusion is characterized in that it is recessed in a state where it is pushed further in from the connection position of the duct.

[0007] The spring portion has a base end portion, a tip end portion having a protrusion portion, and a main body portion having a predetermined length in a longitudinal direction spanning between the base end portion and the tip end portion, The longitudinal direction of the main body is preferably a direction along the connection direction between the chamber connections.

[0008] Moreover, it is preferable that the duct connection pipe has a flange portion made of a hard material at the tip, and a wall portion made of a hard material extending outward from the edge opposite the connection direction of the first hole portion.

[0009] Further, the second hole portion of the chamber connecting pipe has an elongated hole shape with a long dimension in the axial direction, and the first hole portion of the duct connecting pipe has an elongated hole shape with a long dimension in the circumferential direction, It is preferable that the first hole portion and the second hole portion connect the duct connecting pipe and the chamber connecting pipe so as to intersect with each other. Effect of the Invention

[0010] According to claim 1, when connecting, the duct connecting pipe is moved toward the chamber box, and the protruding portion protrudes so as to be exposed to the outside from the first hole portion and the second hole portion, and the connection is completed with a clicking sound. Furthermore, when the connected duct connecting pipe is further moved toward the chamber box, the protruding portion is retracted and the duct connecting pipe is rotated in the circumferential direction, so that the duct connecting pipe can be pulled out from the chamber connecting pipe and the connected state can be released. This allows the duct to be pulled out by simply pushing it in, reducing the labor required.

[0011] According to claim 2, the tip part can be freely elastically deformed for a predetermined length starting from the base part, and the protruding part can be easily inserted inward. This reduces the effort required when connecting or disconnecting the duct.

[0012] According to claim 3, when the duct is connected, the flanges come into contact, and when the connected duct connection pipe is moved toward the chamber box, the wall of the duct connection pipe comes into contact with the protruding portion, making it easier for the protruding portion to sink inward. In particular, ducts are often used with soft materials such as glass wool, and providing hard flanges and walls makes it easier for the protruding portion to sink in, reducing the effort required by the user.

[0013] According to claim 4, the first hole portion not only makes it easier for the first hole portion to collapse when it is protruded and retracted due to connection, but also guides the first hole portion so that it does not collapse or bend in the circumferential direction, and allows the protrusion portion to be introduced into the second hole portion 5. These intersect and overlap, allowing the protrusion portion to maintain the connection state in the correct position. This reduces the user's effort and enables a stable connection in a simple manner. [Brief description of the drawings]

[0014] [Figure 1] FIG. 2 is a perspective view showing a basic configuration of a chamber connecting pipe and a duct connecting pipe. [Diagram 2] FIG. [Diagram 3] FIG. 13 is a perspective view showing a state in which the duct connecting pipe is connected to the chamber connecting pipe, and shows an enlarged partial view of the vicinity of the spring portion. [Figure 4] FIG. 13 is a partially enlarged central cross-sectional view showing the connection state between the chamber connecting pipe and the duct connecting pipe, showing (a) when the opening edge of the duct connecting pipe comes into contact with the protruding portion, (b) when the protruding portion protrudes from the first hole portion and the second hole portion, and (c) when the protruding portion comes into contact with the engaging portion when the duct connecting pipe is moved in the opposite direction to the connection direction with the chamber connecting pipe. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0015] An example of an embodiment of the present invention will be described. As shown in Fig. 1, a connection structure of a duct connection pipe used for blowing gas as an air conditioning system is composed of a chamber connection pipe 2 of a cylindrical chamber box 1 and a duct connection pipe 10, and these can be easily attached with one touch. The axial direction (connection direction) is the longitudinal direction of a duct (not shown), the connection direction between the chamber connection pipe 2 and the duct connection pipe 10, and the direction indicated by the arrow line X in Fig. 1 from the circle center of the chamber connection pipe 2 and the duct connection pipe 10. The peripheral direction is the peripheral direction of the outer surfaces of the chamber connection pipe 2 and the duct connection pipe 10, and is the direction indicated by the arrow line Y in Fig. 1.

[0016] The duct connection pipe 10 is a hollow cylinder made of a steel plate, and a plurality of first holes 11 are opened uniformly along its circumferential surface in the shape of a generally rectangular long hole whose long dimension is in the circumferential direction, and a wall portion 12 is formed protruding outward from the edge of the opening edge of the first holes 11 opposite to the connection direction (towards the chamber box 1). The duct connection pipe 10 has a flange portion 13 formed by bending one end, and a flexible duct is connected to the duct connection pipe 10 in contact with the flange portion 13 and the outer circumferential surface of the duct connection pipe 10. A predetermined duct is connected to the opposite side of the flange portion 13 of the duct connection pipe 10, but this is omitted in the drawing.

[0017] The chamber box 1 is hollow, and its shape can be a cylinder or a box. In this description and drawings, only a part of the box body 3 of the chamber connecting pipe 2 of the chamber box 1 is shown, and the rest is omitted. The chamber connecting pipe 2, which is approximately cylindrical and hollow, is formed to protrude from the box body 3 of the chamber box 1. The chamber connecting pipe 2 is provided with an elastic material 4 with an outer diameter slightly larger than that of the chamber connecting pipe 2 near the opening edge and the joint edge of the chamber box 1. The box body 3 of the chamber box 1 has its walls filled with a heat insulating material such as glass wool.

[0018] The circumferential surface of the chamber connection pipe 2 has the same number of second holes 5 as the number of first holes 11 of the duct connection pipe 10, and the second holes 5 are formed in three equally spaced locations in the circumferential direction in the shape of a substantially rectangular long hole with the axial direction being equal to the number of the first holes 11 of the duct connection pipe 10 in FIG. 1, and the second holes 5 are also formed in three equally spaced locations in the circumferential direction. The number of holes may be four or other numbers. A spring portion 6 and a protruding portion 6d, which will be described later, are arranged on the inner surface side of the chamber connection pipe 2, and the protruding portions 6d, 6d protrude outward so as to be exposed from the first holes 5, 5. The protruding portion 6d is cylindrical in shape, and the upper end is generally rounded, and is recessed downward along the rounded upper end by the force of being pressed by the wall portion 12 and the flange portion 13 during connection as will be described later.

[0019] An example of the spring portion 6 and the protruding portion 6d for one-touch connection will be described. The spring portion 6 shown in Fig. 2 is a leaf spring member consisting of a base end portion 6a, which is a joint surface with the inner peripheral surface of the chamber connection tube 2, a tip end portion 6b on the opposite side of the base end portion 6a, and a spring body portion 6c having a predetermined longitudinal length between the base end portion 6a and the tip end portion 6b, and a cylindrical protruding portion 6d having a rounded top is formed and protrudes from one surface of the tip end portion 6b. Note that the spring portion 6 of this embodiment is merely an example, and may be a resin bellows-shaped member instead of a flat member made of a metal plate.

[0020] 3, the spring portion 6 is fixed to the inner peripheral surface of the chamber connecting pipe 2 with the longitudinal direction of the spring main body portion 6c aligned along the axial direction (connecting direction). That is, only the base end portion 6a of the spring portion 6 is fixed to the inner peripheral surface of the chamber connecting pipe 2, and the protruding portion 6d protruding from the tip end portion 6b via the main body portion 6c is positioned so as to be exposed from the first holes 5, 5.

[0021] The longitudinal direction of the spring body 6c along the connection direction does not necessarily mean that it is strictly parallel, but may be in a direction slightly inclined from the connection direction. Since the longitudinal direction of the spring body 6c is along the connection direction, the protrusion 6d exposed on the flange 13 or the wall 12 comes into contact with the flange 13 or the wall 12 by the connection method described later, and is easily sunk downward, thereby disengaging the engagement.

[0022] The outer diameter of the chamber connecting pipe 2 is slightly smaller than the outer diameter of the duct connecting pipe 10, and the chamber connecting pipe 2 is guided so that the outer peripheral surface of the chamber connecting pipe 2 abuts against the inner peripheral surface of the duct connecting pipe 10 on the same line as the axis of the chamber connecting pipe 2 and the axial direction X of the duct connecting pipe 10, and the tip of the duct connecting pipe 10 abuts against the elastic material 4. Thus, the chamber connecting pipe 2 and the duct connecting pipe 10 are connected.

[0023] The connection form and connection method of the chamber connecting pipe 2 and the duct connecting pipe 10 will be described. As shown in FIG. 4(a), when the duct connecting pipe 10 is guided to the chamber connecting pipe 2, the flange portion 13 of the duct connecting pipe 10 on the chamber connecting pipe 2 side abuts against the lowest portion of the protruding portion 6d of the spring portion 6. Furthermore, as the duct connecting pipe 10 approaches the chamber box 1, the flange portion 13 of the duct connecting pipe 10 on the chamber connecting pipe 2a side is pressed while abutting against the protruding portion 6b of the spring portion 6, thereby pushing down the exposed protruding portion 6b, and the spring portion 6 is elastically deformed so as to sink into the inside of the chamber connecting pipe 2a. The spring portion 6 is pressed inwardly and narrowed, so that only the top of the protruding portion 6d is located within the range of the opening of the second hole portion 5 and on the outer circumferential surface of the chamber connecting pipe 2, and is in contact with the inner circumferential surface of the duct connecting pipe 10.

[0024] As shown in Fig. 4(b), when the duct connecting pipe 10 is further guided to the chamber connecting pipe 2, the duct connecting pipe 10 comes into contact with the elastic material 4, and the first hole 11 and the second hole 5 overlap. In particular, due to the repulsive force of the spring portion 6, the base end portion 6a protrudes outward and is exposed through the second hole portion 5 and the first hole portion 11, and comes into contact with the spring portion 6 which returns to its original shape around the hole, producing a clicking sound. Thus, the duct connecting pipe 10 and the chamber connecting pipe 2 are connected.

[0025] When the connection pipes are connected to each other, the shapes of the first hole 11 and the second hole 5 overlap so as to cross each other. The first hole 11 is an elongated hole shape with a long length in the connection direction, which not only makes it easier for the protrusion 6d to collapse when it is protruded and retracted due to connection, but also guides it so that it does not collapse or bend in the circumferential direction. The second hole 5 of the duct connection pipe 10 is an elongated hole shape with a long length in the circumferential direction, which allows the protrusion 6d to be introduced into the second hole 5 even if it is slightly misaligned in the circumferential direction. These cross and overlap each other, enabling a one-touch connection in which the protrusion 6d can maintain the connection state in the correct position.

[0026] Next, a method for removing the duct connecting pipe 10 will be described. In the connected state in FIG. 4(b), when the duct connecting pipe 10 is moved in the opposite direction to the connection direction, the protruding portion 6b starts to elastically deform inward of the duct connecting pipe 10. However, the first hole portion 11 does not have an opening area large enough to allow the protruding portion 6b to move inward of the chamber connecting pipe 2, that is, the first hole portion 11 is an obstacle and the duct connecting pipe 10 cannot release the connection with the chamber connecting pipe 2. In addition, even when the duct connecting pipe 10 is rotated to the left or right, the spring portion 6 does not elastically deform. Therefore, the protruding portion 6b does not elastically deform inward through the second hole portion 5, and the connection cannot be released.

[0027] On the other hand, when the duct connecting pipe 10 is further pushed toward the chamber box 1, the wall portion 12 of the duct connecting pipe 10 comes into contact with the protruding portion 6d as shown in Fig. 4(c), and when the elastic member 4 is further moved to a position where it receives the flange portion 13 of the duct connecting pipe 10, the protruding portion 6d is elastically deformed so as to sink inward. Then, when the duct connecting pipe 10 is rotated in the circumferential direction with the protruding portion 6d in the retracted state, the protruding portion 6d can be elastically deformed toward the inner peripheral surface of the duct connecting pipe 10. Furthermore, the duct connecting pipe 10 can be pulled out from the chamber connecting pipe 2 to release the connection state. Furthermore, the protrusion 6d can be pushed inward of the chamber connecting pipe 2 by pushing the duct connecting pipe 10 further toward the chamber box 1 side. However, unless the duct connecting pipe 10 is rotated in the circumferential direction, the protrusion 6d will protrude from the first hole portion 11 and the second hole portion 5, and therefore no matter how far the duct connecting pipe 10 is pushed toward the chamber box 1 side, the connected state cannot be released.

[0028] The above is the method of connecting and disconnecting the duct connecting pipe 10 and the chamber connecting pipe 2. That is, when the user connects the duct connecting pipe 10 in the connecting direction, the user cannot move it in the opposite direction, but can release the connected state by rotating it in either the left or right circumferential direction. In addition, since the top of the protruding part 6d is rounded, it easily slides against the inner circumferential surface and hole of the duct connecting pipe when it is elastically deformed, making it easy to move the protruding part. [Explanation of symbols]

[0029] 1...Chamber box, 2...Chamber connecting pipe, 3...Box main body, 4...Elastic material, 5...Second hole, 6...Spring part, 6a...Base end, 6b...Tip end, 6c...Spring main body, 6d...Protrusion, 10...Duct connecting pipe, 11...First hole, 12...Wall, 13...Flange, X...Axial direction (connecting direction), Y...Circumferential direction

Claims

1. A connection structure for connecting a chamber connecting pipe and a duct connecting pipe, the duct connecting pipe has a first hole portion opened on a circumferential surface, the chamber connecting pipe has a second hole portion that opens at a position corresponding to the first hole portion on a circumferential surface thereof, and a spring portion that is disposed on an inner circumferential surface thereof, the spring portion has a base end portion joined to an inner circumferential surface of the chamber connecting pipe, and a protruding portion that is capable of protruding and retracting through the second hole portion and the first hole portion in a state in which the chamber connecting pipe and the duct connecting pipe are connected, A connection structure for a duct connection pipe, characterized in that the protrusion is recessed in a state where it is pushed further in from the connection position of the duct.

2. The spring portion has a base end portion, a tip end portion having a protrusion portion, and a main body portion having a predetermined length in a longitudinal direction spanning between the base end portion and the tip end portion, 2. The connection structure of a duct connection pipe according to claim 1, wherein the longitudinal direction of the main body is a direction along a connection direction between the chamber connections.

3. 3. The connection structure of a duct connection pipe according to claim 2, wherein the duct connection pipe has a flange portion made of a hard material at a tip thereof and a wall portion made of a hard material extending outward from an edge opposite to the connection direction of the first hole portion.

4. the second hole portion of the chamber connecting pipe has an elongated hole shape with a long dimension in the axial direction, and the first hole portion of the duct connecting pipe has an elongated hole shape with a long dimension in the circumferential direction, 4. The connection structure of the duct connection pipe according to claim 3, wherein the first hole portion and the second hole portion connect the duct connection pipe and the chamber connection pipe so as to intersect with each other.

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