JPH08193684A - Piping connection structure - Google Patents

Abstract

PURPOSE: To improve the connectability so that the piping connection may be achieved in one operation to insert the piping when the piping is connected, to prevent the piping from coming off even when the impact is applied from the outside, and to secure the guarantee for a long time by absorbing the vibration. CONSTITUTION: A piping connection structure is provided with a socket 3 which is provided on the outer circumference of the piping 1 of either an inner cylinder or an outer cylinder, formed in the tapered shaped expanding in the tube end direction, and provided with a plurality of engaging holes 2 in the circumferential direction, a locking member 6 which is formed by a plurality of arms 10 which extend in the outer circumferential direction of a tube end part of other piping and expand in the tube end direction, and a pawl 5 capable of engagement with an engagement hole 2 on the outer circumferential side of a top end part is formed in the member 6, and a cover 8 which is provided to cover the outside of the arms 10 of the locking member 6, and provided with a hole 7 for releasing the engagement at the coaxial position with the arms 10 of the locking member 6.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pipe connection structure for fitting and connecting an outer cylinder and an inner cylinder. More specifically, the present invention relates to a pipe connection structure that allows one-touch connection by engaging a claw of a lock member provided on the other pipe with an engagement hole of a socket provided on one pipe.

[0002]

2. Description of the Related Art As a pipe connection structure for fitting and connecting an outer cylinder and an inner cylinder, the one conventionally filed as Japanese Utility Model Application No. 63-76116 has been disclosed.

This structure will be described with reference to FIG. 6. An outer cylinder 51, an inner cylinder 52 having a flange portion 52A at the end of the tube for preventing slipping out, and an outer cylinder 51 that can be retracted from the inside of the tube. And a ball 53 that is fitted to the outer circumference of the outer cylinder 51 so as to be slidable in the pipe length direction.
Sliding sleeve 55 having a concave portion 54 capable of accommodating
And a biasing spring 56 which is interposed between the sliding sleeve 55 and the outer cylinder 51 and pushes the sliding sleeve 55 in a direction of separating from the outer cylinder 51.

According to this structure, the pipe connection is made as follows. Push the sliding sleeve 55 by hand and press the spring 56.
While being pulled in the direction of arrow A against the force of, the inner cylinder 52 is held by hand and fitted into the outer cylinder 51. At this time,
The recess 54 of the sliding sleeve 55 is located at a position facing the ball 53, the ball 53 is pushed into the recess 54 by the inner cylinder 52, and the inner cylinder 52 is allowed to enter.

After the inner cylinder 52 is completely fitted to the outer cylinder 51,
When the sliding sleeve 55 is released, the urging spring 56
Then, the sliding sleeve 55 is pushed back by the force of (1) to the state shown in the figure. At this time, the sliding sleeve 55 moves the ball 53 into the outer cylinder 5.
It is pushed into the inside of 1, and is locked (prevention of locking) by the ball 53 and the flange portion 52A of the inner cylinder 52.

[0006]

However, the structure shown in FIG. 6 has the following problems. Piping 5
When connecting 1, 52, the inner sleeve 52 is inserted into the outer sleeve 51 while pulling the sliding sleeve 55 by hand against the force of the biasing spring 56 in the direction of arrow A when connecting the sliding sleeves 1, 52. It was necessary to remove the hand from 55. That is, two operations, the operation of the sliding sleeve 55 and the operation of inserting the inner cylinder 52, are required, and the workability at the time of pipe connection is poor.

Further, the ball 53 is moved to the outer cylinder 51 by pushing the sliding sleeve 55 by the biasing spring 56.
, And the connection between both pipes 51 and 52 is locked. Therefore, if some sort of impact is applied from the outside and the sliding sleeve 55 slides in the direction of arrow A against the force of the biasing spring 56, the ball 53 may enter the recess 54 and the inner cylinder 52 may come off.

An object of the present invention is to provide a pipe connection structure in which the connection workability is improved so that only one operation of inserting the pipe at the time of pipe connection is required.

Another object of the present invention is to provide a pipe connection structure in which there is no risk of the pipe coming off even if an impact is applied from the outside, and the function is retained for a long time by absorbing vibration.

[0010]

In order to achieve this object, in the invention according to claim 1, in a pipe connection structure for fitting and connecting an outer cylinder and an inner cylinder, either the inner cylinder or the outer cylinder is connected. A socket provided on the outer circumference of one pipe end portion and formed in a tapered shape that expands in the pipe end direction and having a plurality of engagement holes formed in the circumferential direction, and the other pipe end portion of either the outer cylinder or the inner cylinder. A lock member is formed on the outer periphery, in which a plurality of arms extending in the circumferential direction are formed to extend in the pipe end direction and extend, and a claw capable of engaging with the engaging hole is formed on the outer peripheral side of the tip end portion.

According to the second aspect of the invention, the outer cylinder or the inner cylinder is provided on the outer periphery of the pipe provided with the lock member so as to cover the outside of the lock member and is coaxial with the arm of the lock member. The cover has a disengagement hole formed at the position.

According to the third aspect of the present invention, the outer cylinder or the inner cylinder is provided with a cover provided on the outer periphery of the pipe provided with the lock member so as to cover the outside of the lock member.

Further, in the invention according to claim 4, the outer cylinder or the inner cylinder is provided with a socket inner circumference of the pipe in which the socket is provided and a clearance inside the outer circumference of the outer cylinder or the inner cylinder for suppressing vibration. It is equipped with a sealed packing.

[0014]

Therefore, according to the present invention of claim 1,
When either one of the outer cylinder and the inner cylinder is held and fitted into the other pipe, the claw of the lock member advances while sliding along the tapered surface of the inner circumference of the socket, and the arm moves accordingly. Deforms slightly by bending inward. When the claw reaches the position of the engagement hole, the arm elastically restores to the outside, and the claw enters the engagement hole and engages. That is, the outer cylinder and the inner cylinder are fitted and connected with one touch, and at the same time, the claw of the lock member provided on one pipe and the engagement hole of the socket provided on the other pipe are engaged to establish a connection state. Lock is completed.

According to the second aspect of the present invention, since the outer side of the lock member is covered with the cover in the pipe connection state, the lock member is not deformed inward even when an impact is applied from the outside. , The pipe connection is not accidentally disconnected. Further, since the engagement release hole and the arm of the lock member have a coaxial positional relationship, the claw of the lock member and the engagement hole of the socket can be engaged simply by inserting the jig straight into the engagement release hole. It will be canceled.

According to the third aspect of the present invention, since the outer side of the lock member is covered with the cover in the pipe connected state, the lock member is not deformed inward even when an impact is applied from the outside. , The pipe connection is not accidentally disconnected.

Further, according to the present invention as set forth in claim 4, since the packing is provided at the inner space and the outer circumference of the socket or the inner space of the outer circumference of the inner cylinder, the packing absorbs vibration.

[0018]

Embodiments of the present invention will be described below with reference to FIGS.

FIG. 1 shows a pipe connection structure of an embodiment of the present invention. This pipe connection structure has a socket 3 provided on the outer periphery of an inner cylinder 1 and having a plurality of engagement holes 2 formed in the circumferential direction.
A lock member 6 having a plurality of arms 10 extending in the circumferential direction on the outer circumference of the outer cylinder 4 extending in the pipe end direction and a claw 5 formed at the tip; and an outer side of the lock member 6 on the outer circumference of the outer cylinder 4. And a cover 8 provided so as to cover and formed with an engagement releasing hole 7.

Here, in this embodiment, the socket 3 is provided in the inner cylinder 1, and the lock member 6 and the cover 8 are provided in the outer cylinder 4. However, conversely, the socket 3 may be provided in the outer cylinder 4, and the lock member 6 and the cover 8 may be provided in the inner cylinder 1.

Further, as shown in FIGS. 1 and 2, the socket of the present embodiment has an annular mounting portion 16 having an L-shaped cross section which conforms to the outer peripheral shape in which the flange 1A is formed in the circumferential direction of the inner cylinder 1. The taper portion 17 is formed in a tapered shape and extends from the mounting portion 16 in the pipe end direction, and a plurality of engagement holes 2 are formed at equal intervals in the circumferential direction of the taper portion 17.

The lock member 6 of this embodiment, as shown in FIGS. 1 and 3, has a ring-shaped mounting portion 9 fitted to the outer periphery of the outer cylinder 4 and a peripheral portion from the mounting portion 9. A plurality of arms 10 are provided at equal intervals in the direction and extend outwardly toward the tip (in the tube end direction), and a claw 5 formed to be bent outward at the tip of the arm 10.

Therefore, when connecting the pipes, the lock member 6
Moves while the claw 5 slides along the inner peripheral surface of the tapered portion 17 of the socket 3, and accordingly the arm 10 is slightly bent inward and deformed, and the claw 5 reaches the position of the engaging hole 2. Then, the arm 10 elastically restores to the outside, and the claw 5 enters the engaging hole 2 and engages.

As the lock member 6, the arm 10 may be fixed to the outer circumference of the pipe one by one without providing the annular mounting portion 9.

As shown in FIGS. 1 and 4, the cover 8 of this embodiment has an annular mounting which is fitted to the outer periphery of the outer cylinder 4 (more precisely, the outer periphery of the mounting portion 9 of the lock member 6). Part 1
1 and a protective portion 12 that extends from the mounting portion 11 in the radial direction, is bent at a substantially right angle, and extends cylindrically in the pipe axial direction.
And a plurality of disengagement holes 7 formed at a plurality of positions at equal intervals in the circumferential direction on the radially expanded portion of the protective portion 12.

The protective portion 12 covers the outer peripheral side of the lock member 6 to prevent an external force from being applied to the lock member 6. Therefore, it is necessary that at least the pipe should be formed to have a length that completely covers the lock member 6 in the connected state. In addition, the inner diameter of the cylindrical portion of the protective portion 12 is formed to be larger than the maximum outer diameter of the tip of the socket so as not to collide with the socket 3 when connecting the pipes.

The engagement releasing hole 7 is provided with an appropriate jig (not shown).
Is inserted to deform the lock member 6 inward and remove the claw 5 from the engagement hole 2. In this example, a plurality are formed at equal intervals in the circumferential direction. Further, the lock member 6 is provided coaxially with the arm 10. Therefore, it is possible to hit the arm 10 of the lock member 6 by simply inserting the jig inserted into the engagement releasing hole 7
It can be pushed down and can be released easily.

The position for forming the engagement releasing hole 7 is not limited to this example, and may be any position as long as the jig and the arm 10 of the lock member 6 face each other.

As a method for fixing the socket 3, the lock member 6 and the cover 8 to the pipes 1 and 4, welding,
An appropriate fixing method such as caulking may be adopted. Also,
In the above description, the engagement holes 2, the arms 10 and the engagement releasing holes 7 are the same in the number and the installation position in the circumferential direction.

Reference numeral 13 indicates a packing for sealing the inner and outer pipes, which is mounted in a groove 14 formed in an annular shape on the outer circumference of the inner cylinder 1. Reference numeral 15 denotes a pipe sealing packing or a rubber packing that is mounted on the inner periphery of the socket 3 and the inner space of the outer periphery of the inner cylinder 1. This packing 1
5 is formed so as to be engaged in a state in which it is contracted by several% to several tens% when the pipes are connected. The packing 15 is provided to suppress vibration.

According to the pipe connecting structure constructed as described above, the pipe connecting operation is performed as follows, and the accidental disconnection is prevented.

In this example, the inner cylinder 1 is the fixed side, and the outer cylinder 4 is fitted and connected to this.

The outer cylinder 4 is held by hand and fitted to the outer circumference of the inner cylinder 1. At this time, the lock member 6 advances while the claw 5 slides along the inner peripheral surface of the tapered portion 17 of the socket 3,
Along with that, the arm 10 is slightly bent inward and deformed. Then, when the claw 5 reaches the position of the engagement hole 2, the arm 10 elastically restores to the outside, and the claw 5 enters the engagement hole 2 and is engaged. In this way, one-touch inner and outer piping 1, 4
At the same time as connecting the
It is engaged with the engaging hole 2 of 1 to lock the pipe connection state.
As a result, even if a force is applied to separate the inner and outer pipes 1 and 4 from each other, they will not come off.

The outer cylinder 4 is fixed and the inner cylinder 1 is attached to this.
Even if they are fitted together, they operate in exactly the same manner.

In the pipe connected state, the outside of the lock member 6 is covered with the cover 8. Therefore, even if an impact is applied from the outside, the lock member 6 is not deformed inward, and the pipe connection is not released.

Further, the vibration is absorbed by the packing 15.

To release the pipe connection, a jig (not shown) is inserted straight through the engagement releasing hole 7 formed in the cover 8 to deform the lock member 6 inward,
The engagement between the claw 5 and the engagement hole 7 may be released, and then the outer cylinder 4 may be pulled out by hand.

Although the pipe connection structure of the present invention is suitable for a pipe connection structure of an air conditioner for an automobile, for example, it is needless to say that the pipe connection structure is generally applicable to the pipe connection structure.

Further, the present invention is not limited to the above-mentioned embodiment, and various modifications can be carried out.

For example, although the cover 8 is provided on the pipe 4 provided with the lock member 6 in the above-described embodiment, the present invention is not limited to this, and the cover 8 is provided with the socket 3 as shown in FIG. It may be provided in the pipe 1. In this case, a jig or the like is inserted from the opening opening 18 at the tip of the cover 8 to release the engagement. According to this example, there is an advantage that the disengagement hole need not be specially formed.

[0041]

The pipe connecting structure of the present invention described above has the following effects. According to the pipe connection structure of the present invention as set forth in claim 1, at the time of pipe connection, the claw of the lock member provided on one pipe is engaged with the engagement hole of the socket provided on the other pipe, and the pipe connection is made. The state is locked. In other words, the lock is completed with only one operation (one-touch) of fitting the inner and outer pipes. Therefore, compared with the case where the sliding sleeve operation is required in addition to the conventional pipe fitting operation, Workability can be improved.

Further, when the outside of the lock member is covered with the cover in the pipe connected state as in the pipe connecting structure according to claim 2, even if an impact is applied from the outside,
The locking member is not deformed inward, and the pawl is not disengaged from the engaging hole. That is, it is possible to prevent the pipe connection from being accidentally released due to an external impact. Further, since the engagement release hole and the arm of the lock member have a coaxial positional relationship, the hook of the lock member and the engagement hole of the socket can be engaged simply by inserting the jig straight into the engagement release hole. Can be released.

Further, when the outside of the lock member is covered by the cover in the pipe connected state as in the pipe connecting structure according to claim 3, even if an impact is applied from the outside,
The locking member is not deformed inward, and the pawl is not disengaged from the engaging hole. That is, it is possible to prevent the pipe connection from being accidentally released due to an external impact.

When the packing is provided in the inner periphery of the socket and the outer cylinder or the inner space of the outer circumference of the inner cylinder as in the pipe connection structure according to the fourth aspect, vibration is absorbed by the packing. Enables long-term function retention.

[Brief description of drawings]

FIG. 1 is a vertical sectional view showing an embodiment of a pipe connection structure of the present invention.

FIG. 2 is a perspective view showing a socket in the pipe connection structure of FIG.

3 is a perspective view showing a lock member of the pipe connection structure of FIG. 1. FIG.

4 is a perspective view showing a cover of the pipe connection structure of FIG. 1. FIG.

FIG. 5 is a vertical sectional view showing another embodiment of the pipe connection structure of the present invention.

FIG. 6 is a vertical cross-sectional view showing a conventional pipe connection structure.

[Explanation of symbols]

 1 Inner Cylinder 2 Engagement Hole 3 Socket 4 Outer Cylinder 5 Claw 6 Lock Member 7 Engagement Release Hole 8 Cover 10 Lock Member Arm 15 Packing

Claims (4)

[Claims] 1. A pipe connection structure for fitting and connecting an outer cylinder and an inner cylinder, wherein the outer cylinder and the outer cylinder are provided on the outer periphery of one of the tube ends and are tapered in a pipe end direction. A socket having a plurality of engaging holes formed in the circumferential direction,
A plurality of arms extending in the circumferential direction are formed so as to extend in the pipe end direction on the outer periphery of the other pipe end of the outer cylinder or the inner cylinder, and can be engaged with the engagement hole on the outer peripheral side of the tip end. A pipe connection structure comprising: a lock member having a transparent claw formed thereon. 2. A disengagement hole provided on the outer circumference of a pipe provided with a lock member of the outer cylinder or the inner cylinder to cover the outside of the lock member and at a position coaxial with the arm of the lock member. The pipe connection structure according to claim 1, further comprising a cover formed with. 3. The cover according to claim 1, further comprising a cover provided to cover an outer side of the lock member on an outer circumference of a pipe provided with the lock member of the outer cylinder or the inner cylinder. Pipe connection structure. 4. A packing provided for suppressing vibration at the inner periphery of the socket of the pipe in which the socket is provided among the outer cylinder or the inner cylinder and the inner space of the outer circumference of the outer cylinder or the inner cylinder. The pipe connection structure according to claim 1, wherein: