JPH0320631Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a pipe joint structure for interconnecting refrigerant pipes in, for example, an automobile air conditioner, and particularly relates to a pipe joint separation jig used therein.

(Prior art) For example, in an automobile air conditioner, in addition to the refrigerant piping that constitutes the so-called cooling cycle system,
Hot water piping is installed, and hot water such as refrigerant or engine cooling water is guided to a heat exchanger, which cools and heats the air blown into the cabin, thereby heating and cooling the cabin. . The pipe joint structure conventionally used for interconnecting various types of pipes, including those of automobile air conditioners, is the 60-year-old pipe joint structure.
As shown in Japanese Patent No. 16082, there is a method for connecting pipes to each other by threaded engagement.

FIG. 7 shows such a conventional pipe joint structure. This joint is a joint for refrigerant piping, and includes a union 2 fixed to one end of the first pipe 1 by welding means such as brazing,
The union 2 is attached to the end of the other second pipe 3.
It has a nut 4 screwed to. Second
The pipe 3 is formed with a bead 6 that comes into contact with the end surface of the union 2, and the tip 3a of the second pipe 3
An O-ring 5 is attached between the inner circumferential surface 2a of the opening of the union 2 and the inner circumferential surface 2a of the union 2 to ensure airtightness or watertightness.

(Problems to be solved by the invention) In such a conventional pipe joint, the pipes 1 and 3 are connected to each other by threading the union 2 and the nut 4. Because of this, it is not only necessary to use tools such as spanners and wrenches during this connection operation, but also
It is necessary to use these tools to tighten the union 2 and the nut 4 with a predetermined tightening force, and it is not easy to manage this tightening torque.

In order to eliminate such inconveniences, recently, instead of screwing the nut 4 and the union 2 together, as shown in FIGS. Known joint structures have been proposed. The joint structure using this elastic body 11 has a first
An elastic body 11 is installed in the sleeve 10 that engages with the radial step 13, and this elastic body 11 engages with a second radial step 15 formed on the other pipe 14,
Both pipes are connected.

However, in such a joint structure, when disconnecting the pipes, a detachment jig 16 as shown in FIG. 2 radial step portion 15
However, at that time, the connection between both pipes is instantly removed, which is inconvenient when the internal pressure of the pipes is high.
For example, if such a pipe joint structure is used as a refrigerant pipe and the pipes are disconnected without forgetting to remove the internal refrigerant gas, the pressure of the internal refrigerant gas will cause both pipes to separate at the joint. Since the force was applied suddenly in the direction, it was not favorable for the work.

The present invention was developed in view of the above circumstances, and utilizes the elastic force of an elastic body such as a leaf spring to improve workability and safety when separating pipe joints that connect pipes together. The purpose of the present invention is to provide a pipe joint detachment jig with excellent performance.

(Means for Solving the Problems) In order to achieve the above object, the present invention separates a pipe joint that connects the ends of two pipes to each other using the elastic force of the elastic body in the sleeve. The pipe joint detachment jig is inserted into the sleeve and presses the elastic body to elastically deform the elastic body to release the elastic body from the pipe. A first radial protrusion and a second radial protrusion that protrudes with a predetermined position shift in the circumferential direction and axial direction with respect to the first radial protrusion are formed on the outer periphery of the cylindrical part, It is characterized in that the first and second radial protrusions are inserted into guide grooves formed in the sleeve at predetermined rotational positions, respectively.

(Example) Examples will be described below with reference to the drawings.

Fig. 1 is a perspective view of the pipe joint detachment jig according to the present embodiment, Figs. 2 to 4 are half-sectional views of main parts showing the process of disengaging the pipe joint, and Fig. 5 is shown in Fig. 3.
It is a sectional view along a line.

In this embodiment, a joint structure used for refrigerant piping used in an automobile air conditioner will be explained as an example.

The ends of two pipes 21 and 22 used in the refrigerant piping shown in FIGS. 1 to 5 must be connected with good airtightness so that the refrigerant gas inside does not leak to the outside. Therefore, the adapter 23 is brazed to the end 21a of the first pipe 21, one of the two pipes, and the adapter 23
An O-ring 24 is attached to the outer periphery of the end of the adapter 23, so that the inner periphery of the enlarged end 22a of the other second pipe 22 fits onto the outer periphery of the end of the adapter 23.

Further, in order to prevent the connection between the first and second pipes 21 and 22 from coming off, the adapter 23 is formed with a first radial step portion 25 that protrudes outward in the radial direction. The tongue piece 30 of the elastic body 29 is housed in the housing recess 28 in the cylindrical sleeve 27 in which the abutment part 26 that comes into contact with is formed.
It is adapted to engage with a second radial step 31 formed at the tip of the end 22a of the second pipe 22.

The elastic body 29 is composed of a double annular leaf spring,
The tongue piece 30 is designed to be elastically deformed in the radial and axial directions. As shown in FIG. 2, the elastic force in the axial direction by the elastic body 29
The first and second radial step portions 25 and 31 of the first and second pipes 21 and 22 are brought closer to each other through the first and second pipes 21 and 22 to prevent the two pipes from becoming disconnected. Further, since the tongue piece 30 of the elastic body 29 housed in the sleeve 27 can be elastically deformed in the radial direction, detachment of the pipe as shown in FIGS. 3 and 4 and connection of the pipe (not shown) can be easily performed. It is becoming more and more like this.

The configuration of the pipe joint removal jig according to this embodiment used in such a pipe joint structure is shown below.

As shown in FIG. 2, the pipe joint removal jig 35 according to the present embodiment includes a cylindrical insertion tube portion 36 that covers the outer periphery of the second pipe 22, and this insertion tube portion 3.
It has an outer diameter larger than the outer diameter of 6, and consists of a gripping cylinder part 37 for gripping during work. Particularly in this embodiment, this jig 35 is formed with a split surface 38 and is of a two-piece type, so that it can be attached from any position on the second pipe 22, thereby facilitating workability. . In addition, as another embodiment, a hinge or the like may be attached to this split surface 38.

The outer diameter of the insertion tube 36 is slightly smaller than the inner diameter of the insertion hole 39 formed in the sleeve. Moreover, the inner diameter of this cylindrical portion 36 is
As shown in FIG. 4, the outer diameter is slightly larger than the diameter-enlarged step portion 22a of the second pipe 22.
Therefore, the insertion tube 36 can be conveniently inserted through the gap between the insertion hole 39 formed in the sleeve 27 and the second pipe 22.

Furthermore, a plurality of first and second radial protrusions 40 and 41 protruding radially outward are formed on the outer periphery of the insertion tube 36 at predetermined intervals in the circumferential direction. These first and second radial protrusions 40, 41
are formed to be shifted by a predetermined position in the circumferential direction and axial direction. In particular, in this embodiment, they are arranged in a staggered manner as shown in FIG. These first and second
The circumferential width and radial height of the radial protrusions 40 and 41 are such that the guide grooves 42 formed around the insertion hole 39 in the sleeve 27 are inserted at a predetermined rotational position of the cylindrical portion 36, respectively. determined as possible. Each first and second radial protrusion 40, 4
1 and the guide groove 42 formed in the sleeve 27 is performed by rotating the gripping cylinder 37.

Next, the action will be explained.

The pipe joint detachment operation using the pipe joint detachment jig according to this embodiment is performed as follows.

First, as shown in FIG. 1, the jig 35 is attached to the outer periphery of the second pipe 22, and the gripping cylindrical part 37 is rotated, so that the first radial protrusion formed on the outer periphery of the insertion cylindrical part 36 is 40 is aligned with the circumferential position of the guide groove 42 formed in the sleeve 27.

Next, in this state, as shown in FIG.
Push it in. At that time, the first radial protrusion 40
is guided by the guide groove 42. However, since the rotational position of the second radial protrusion 41 does not match with the guide groove 42, it comes into contact with the end 27a of the sleeve 27, and the relative movement of the jig 35 in the axial direction with respect to the sleeve 27 is restricted. . In this state, the tip of the insertion tube 36 does not come into contact with the tongue piece 30 on the elastic body 29 . Therefore, at this stage, the tongue piece 30 is not elastically deformed in the radial direction and is not disengaged from the second radial stepped portion 31 formed on the second pipe.

Next, the gripping cylinder part 37 is rotated to rotate the insertion cylinder part 36, and the rotational position of the second radial protrusion 41 is aligned with the circumferential position of the guide groove 42 formed in the sleeve 27. In this state, when the jig 35 is pushed into the sleeve 27, as shown in FIG.
The second radial protrusion 41 is guided by the guide groove 42, and the insertion tube 36 is completely pushed into the sleeve 27. Then, the tip of the insertion cylinder portion 36 and the first radial protrusion 40 come into pressure contact with the tongue piece 30 of the elastic body 29, and the tongue piece 30 is elastically deformed radially outward. Therefore, the tip of the tongue piece 30 and the second
A second radial stepped portion 3 formed at the tip of the pipe 22
The lock with 1 will be released.

At that time, if you forget to remove the refrigerant gas flowing inside both pipes 21 and 22 and remove this pipe joint, the internal refrigerant pressure will cause the At the same time, when the tongue piece 30 is disengaged from the second radial step 31, a sudden force is applied in the direction of separating both the pipes 21, 22. Therefore, the second pipe 22 is
The first pipe 21 and sleeve 27 together with the jig 35
, axial movement is performed in the direction A in the figure. However, in this previous step, the jig 35 was rotated to align the circumferential positions of the second radial protrusion 41 and the guide groove 42, and as a result, the positions of the first radial protrusion 40 and the guide groove 42 were aligned. Because the circumferential position is not aligned,
The relative movement in the axial direction with respect to the first pipe 21 and the sleeve 27 is such that the first radial protrusion 40
It is restricted at the position where it comes into contact with the end portion 27a of 7.

Thereafter, the refrigerant gas is released to the outside through the gap formed between the first and second pipes, so that the internal pressure of the pipes 21 and 22 becomes equal to atmospheric pressure.
Thereafter, the jig 35 is rotated to align the circumferential position of the first radial protrusion 40 and the guide groove 42 formed in the sleeve, and the jig 35 is rotated together with the second pipe 22 in the direction of arrow A in FIG. When the pipe joint is pulled out, the pipe fitting removal work is completed. At this time, no external force such as refrigerant pressure that would interfere with the work is applied, so the work can be done easily, quickly, and safely.

Note that the present invention is not limited to the embodiments described above, and can be modified in various ways.

For example, as shown in FIG.
A pair of first and second radial protrusions 40a and 41a formed on the outer periphery of the insertion tube 36 may be continuously formed. In addition, the first and second radial protrusions 4 formed on the outer periphery of the insertion tube 36 in the detachment jigs 35, 35a.
Any number of numbers 0, 40a, 41, and 41a may be formed as long as there is at least one. These embodiments also have the same effect as the embodiments described above.

(Effects of the invention) As described above, according to the invention, the pipe used when separating the pipe joint that connects the ends of two pipes to each other using the elastic force of the elastic body in the sleeve In the joint detachment jig, an outer periphery of the insertion cylinder part that is inserted into the sleeve, presses the elastic body to elastically deform the elastic body, and releases the elastic body from the pipe; a first radial protrusion; and a second radial protrusion that protrudes with a predetermined position shift in the circumferential direction and axial direction with respect to the first radial protrusion; Since the radial protrusions are inserted into the guide grooves formed in the sleeve at predetermined rotational positions, the work can be done quickly, easily, and relatively safely when removing the pipe joint. It has excellent effects.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of a pipe joint detachment jig according to an embodiment of the present invention, FIGS. 2 to 4 are half-sectional views of main parts showing the pipe joint detachment process, and FIG. 5 is shown in FIG. 3. 6 is a sectional view taken along the line; FIG. 6 is a perspective view of a pipe joint removal jig showing another embodiment of the present invention; FIG.
The figure is a half-sectional view of the main part showing the conventional pipe joint structure.
FIGS. 8 and 9 are half-sectional views of main parts showing recently proposed pipe joint structures. 21...first pipe, 22...second pipe, 2
3... Adapter, 24... O-ring, 25... Second radial step, 26... Contact portion, 27... Sleeve, 29... Elastic body, 30... Tongue piece, 31... Second Radial stepped portion, 35...pipe joint removal jig,
36... Tube for insertion, 37... Tube for grip, 40
...First radial protrusion, 41... Second radial protrusion, 42... Guide groove.

Claims (1)

[Scope of utility model registration request] A pipe joint detachment jig used for detaching a pipe joint that connects the ends of two pipes to each other using the elastic force of an elastic body in the sleeve, which is inserted into the sleeve 27. , a first radial protrusion 40 on the outer periphery of the insertion cylinder part 36 which presses the elastic body 29 to elastically deform the elastic body 29 to release the elastic body 29 from the pipe 22; a second radial protrusion 41 that protrudes with a predetermined position shift in the circumferential direction and axial direction with respect to the first radial protrusion 40;
The second radial protrusions 40 and 41 are connected to the sleeve 27.
A pipe joint removal jig characterized in that the jig is inserted into guide grooves 42 formed at predetermined rotational positions.