JP2001090880A - Joint device for piping - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent an O-ring locked in a locking recessed groove from being damaged when a cylinder part constituting a first joint element is inserted into a circular hole constituting a second joint element. SOLUTION: Of the above cylinder part 4a, a tip-side portion where the locking recessed groove 5 is formed is a small-diameter part 10 and a base end part is a large-diameter part 11. Of the above circular hole 8a, a deeper-side portion is a small-diameter hole part 12 allowing the part 10 to be inserted therein and an opening end part is a large-diameter hole part 13 allowing the part 11 to be inserted therein without much play. A chamfer part 9 is formed on an opening end part of the hole part 12. Where the diameter of an elastic material making up the O-ring 6 is A, the axial distance from an end edge on the base-end side of the groove 5 to the tip-side edge of the part 11 is B, the axial length of the hole part 13 is C, and the axial length of the chamfer part 9 is D, the respective dimensions A to D are regulated to satisfy the relation of C+D>A+B.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION A piping joint device according to the present invention is used for connecting a steam compressor to a device such as a condenser or an evaporator, which constitutes a vapor compression refrigerator incorporated as an air conditioner for an automobile. It is used to connect the end of the pipe for connection.

[0002]

2. Description of the Related Art For example, when a vapor compression refrigerator to be incorporated as an air conditioner for an automobile is constructed, devices such as a condenser and an evaporator which constitute the vapor compression refrigerator are connected to each other for transferring a refrigerant. Connect with piping.
Conventionally, a pipe joint device as shown in FIG. 3 has been used to connect the end of such a pipe to each of the above devices. This piping joint device comprises a first joint element 1 and a second joint element 2. First joint element 1 of these
Is a flange 3 for connecting the end of the pipe 14 by brazing or the like, and one side of the flange 3 (the lower surface in FIG. 3).
And a columnar portion 4 protruding from the main body.

[0003] Inside the first joint element 1, a state is established in which the front end surface (the lower end surface in FIG. 3) of the cylindrical portion 4 and the other surface (the upper surface in FIG. 3) of the flange portion 3 communicate. The above piping 14
A flow hole 15 for flowing a fluid flowing through the inside is provided. The end of the pipe 14 is fixed to the base end opening of the flow hole 15 (the end opening on the other surface of the flange 3) by brazing or the like. A locking groove 5 is formed on the outer peripheral surface of the intermediate portion of the cylindrical portion 4 over the entire circumference, and the O-ring 6 is locked in the locking groove 5. The outer peripheral edge portion of the O-ring 6 locked in the locking groove 5 in this way protrudes in the diametrical direction from the outer circumferential surface of the cylindrical portion 4.

The second joint element 2 comprises a mounting surface 7 which can be in close contact with one surface of the first coupling element 1 and a cylindrical portion 4 having one end opened in the mounting surface 7. And an insertable circular hole 8. The other end of the circular hole 8 is joined to a mounting surface of each device (for example, an outer surface of a header constituting the condenser, the evaporator or the compressor) on the surface of the second joint element 2. The other end of the pipe whose one end is opened in the internal space of each of the above-described devices is air-tightly and liquid-tightly connectable. In any case, such a circular hole 8
Is connected to the internal space of each device while the second joint element 2 is joined and fixed to the mounting surface of each device. It should be noted that the structure of the communicating portion between the other end of the circular hole 8 and the internal space of each device has been known in the related art, and is not related to the main part of the present invention. The detailed description above is omitted. Further, a chamfered portion 9 having a conical concave shape, which is a guide surface portion that is inclined in a direction in which the diameter increases toward the opening edge, is formed around the entire periphery of the one end opening of the circular hole 8.

When the end of the pipe 14 is connected to each of the above devices by the first and second joint elements 1 and 2 configured as described above, first, the end of the pipe 14 is connected to the flange section. 3 is fixed to the other end of the flow hole 15 by caulking or brazing. At the same time, the second joint element 2 is joined and fixed to the mounting surface of each device while the other end of the circular hole 8 communicates with the internal space of each device.
Then, while guiding the tip of the cylindrical portion 4 by the chamfered portion 9, the cylindrical portion 4 is inserted into the circular hole 8, and as shown in FIG. In close contact with the mounting surface 7 of the joint element 2. Next, the first and second coupling elements 1 and 2 are coupled and fixed by coupling means (not shown). Such coupling means include, for example,
The insertion hole provided in a part of the first coupling element 1, the screw hole provided in a part of the mounting surface of the second coupling element that matches the insertion hole, and the rod portion thereof are inserted through the insertion hole. A coupling structure comprising a bolt which can be screwed and tightened into the above screw hole while the male screw portion is inserted into the hole can be adopted.

With the first and second joint elements 1 and 2 connected and fixed as described above, the outer peripheral edge of the O-ring 6
The inner peripheral surface of the circular hole 8 is elastically brought into contact with the inner peripheral surface of the circular hole 8 over the entire periphery, thereby sealing between the inner peripheral surface of the circular hole 8 and the outer peripheral surface of the cylindrical portion 4. As a result, in a state where the connection between the pipe 14 and each device is kept air-tight and liquid-tight, these pipes 14
And the internal spaces of the devices communicate with each other.

[0007]

In the case of the conventional structure configured as described above, the following inconvenience may occur. That is, in the case of the conventional structure as described above, the inner diameter of the circular hole 8 is slightly larger than the outer diameter of the cylindrical portion 4 so that the cylindrical portion 4 can be easily inserted into the circular hole 8. are doing. For this reason, in the actual assembling work, the cylindrical portion 4
As shown in FIG. 4, the contact portion (point P) between the distal end edges of these columnar portions 4 and the inner peripheral surface of the circular hole 8 is inserted into the circular hole 8.
The center axis of the column 4 may be inclined with respect to the center axis of the circular hole 8. In particular, in a narrow place such as an engine room of an automobile, the tip of the cylindrical portion 4 tends to be inserted obliquely with respect to the opening of the circular hole 8. Are easily inclined with respect to the center axis of the circular hole 8. In addition, as a result of the inclination of the central axis of the cylindrical portion 4, as shown in FIG. 4, a part of the base end edge (the upper end edge in FIGS. However, when the chamfered portion 9 abuts on the chamfered portion 9 and a part of the small-diameter side edge of the chamfered portion 9 in the circumferential direction enters the inside of the locking concave groove 5, A part of the O-ring 6 in the circumferential direction is strongly crushed. In such a strongly crushed portion, the O-ring 6 elastically extends in the circumferential direction. Therefore, the portion of the O-ring 6 which is diametrically opposite to the portion which is strongly crushed as described above is diametrically outward from the locking groove 5 as shown in an exaggerated manner in FIG. It protrudes greatly toward one.

Then, from the state shown in FIG.
When the cylindrical portion 4 is pushed into the circular hole 8, as described above, a part of the O-ring 6 that protrudes greatly from the locking groove 5, the base edge of the locking groove 5 and the O-ring 6. Being bitten (being bitten) with the chamfer 9 creates a possibility of damage. If a part of the O-ring 6 is damaged in this way, it is not preferable because the inner peripheral surface of the circular hole 8 and the outer peripheral surface of the cylindrical portion 4 cannot be sufficiently sealed. The piping joint device of the present invention has been invented in order to realize a structure in which the O-ring is not damaged as described above even when an actual assembling operation is performed.

[0009]

The pipe joint device of the present invention comprises a first joint element which can be freely connected to the end of the pipe, and a first joint element similar to the above-mentioned conventional joint device. A second coupling element that can be coupled to the element. The first joint element among these is a flange portion that can be connected to the end of the pipe, a cylindrical portion protruding from one side of the flange portion, and a distal end surface of the cylindrical portion and the flange portion. A communication hole communicating with the other surface for allowing a fluid flowing in the pipe to flow, a locking groove formed over the entire outer peripheral surface of an intermediate portion of the cylindrical portion, and a locking groove formed around the circumference; An O-ring locked in the concave groove. The second joint element includes a mounting surface and a circular hole opened in the mounting surface, through which the column portion can be inserted and through which the fluid flowing through the pipe can flow.

In particular, in the pipe joint device of the present invention, the cylindrical portion has a small diameter portion at the distal end portion, a large diameter portion concentric with the small diameter portion at the base end portion, and the cylindrical portion. A recess groove is formed on the outer peripheral surface of the intermediate portion of the small diameter portion. or,
The circular hole has a small-diameter hole portion into which the small-diameter portion can be inserted and a large-diameter hole portion into which the large-diameter portion can be inserted concentrically with each other, and has an opening edge at an opening end of the small-diameter hole portion. A guide surface portion inclined in a direction in which the diameter increases as going toward is formed over the entire circumference. Further, let the diameter of the O-ring be A,
The axial dimension from the proximal end edge of the locking groove to the distal end edge of the large diameter portion is B, and the axial dimension of the large diameter hole portion is C.
When the axial dimension of the guide surface portion is D, these dimensions A to D satisfy the relationship of C + D> A + B.

[0011]

In the case of the piping joint device of the present invention configured as described above, the dimensional restriction of each part as described above (C + D> A +
Since B) is performed, when the cylindrical portion provided in the first joint element is inserted into the circular hole provided in the second joint element, the O-ring locked in the locking groove is used for the guide. Before reaching the small-diameter side edge of the surface portion, the distal end of the large-diameter portion provided at the base end portion of the cylindrical portion enters the large-diameter hole portion provided at the opening end of the circular hole. The large-diameter hole has an inner diameter that allows the large-diameter portion to be inserted without large backlash. For this reason, after the leading end of the large diameter portion enters the large diameter hole portion, the contact portion between the circumferential portion of the leading edge of the cylindrical portion and the inner peripheral surface of the circular hole is centered. When the central axis of the cylindrical portion is inclined with respect to the central axis of the circular hole, a part of the base end edge of the locking groove in the circumferential direction abuts against the guide surface portion, A part of the outer peripheral surface of the large diameter portion in the circumferential direction abuts on the inner peripheral surface of the large diameter hole.

As a result, the degree of inclination of the center axis of the cylindrical portion with respect to the center axis of the circular hole is reduced, and a part of the small-diameter side edge of the guide surface portion in the circumferential direction locks the O-ring. It can be prevented from entering deeply into the engaged locking groove. For this reason, a part of the O-ring in the circumferential direction of the small-diameter side edge of the guide surface portion is prevented from being strongly crushed. Along with this, a part of the O-ring in the circumferential direction does not largely protrude from the locking groove in the diameter direction.
Therefore, from the state where the center axis of the cylindrical portion is inclined as described above,
Further, even if this cylindrical portion is pushed into the circular hole, the above O
A part of the ring is not bitten (bitten) between the base edge of the locking groove and the guide surface. Because of this,
It is possible to effectively prevent the O-ring from being damaged during the assembling operation.

[0013]

1 and 2 show an embodiment of the present invention. It should be noted that the feature of the present invention is that the cylindrical portion 4a constituting the first joint element 1a and the second joint element 2a
When the cylindrical portion 4a is inserted into the circular hole 8a, the O-ring 6
This is to prevent galling (damage) from occurring. Since the structure and operation of the other parts are the same as those of the conventional structure described above, the illustration and description of the overlapping parts will be omitted or simplified, and the following description will focus on the characteristic parts of the present invention.

The cylindrical portion 4a constituting the first joint element 1a has a small-diameter portion 10 at the front end (the lower end in FIGS. 1 and 2).
A large-diameter portion 11 at the base end side (upper end side in FIGS. 1 and 2),
They are formed concentrically with each other. The locking groove 5 is formed on the outer peripheral surface of the intermediate portion of the small diameter portion 10 over the entire circumference, and the O-ring 6 is locked in the locking groove 5. The outer peripheral edge of the O-ring 6 locked in the locking groove 5 in this manner projects diametrically outward from the outer peripheral surface of the small diameter portion 10. Then, with the small-diameter portion 10 inserted into the small-diameter hole portion 12 constituting the circular hole 8a described below,
The outer peripheral edge of the ring 6 elastically abuts on the inner peripheral surface of the small-diameter hole portion 12 over the entire periphery, and seals between the outer peripheral surface of the small-diameter portion 10 and the inner peripheral surface of the small-diameter hole portion 12. I do.

The circular hole 8a forming the second joint element 2a has a large-diameter hole portion 13 at the end on the opening side, into which the large-diameter portion 11 can be inserted without large backlash, and a large-diameter hole portion 13 at the back side portion. The small-diameter holes 12 into which only the small-diameter portions 10 can be inserted are formed concentrically with each other. The large-diameter portion 11 is connected to the large-diameter hole portion 13.
The large diameter portion 11 is easily inserted into the large diameter hole portion 13 and the large diameter portion 11 is inside the large diameter hole portion 13 and the O The large-diameter hole portion 13 is formed so that the ring 6 can be inclined only to such an extent that the ring 6 is not greatly crushed by the small-diameter side edge of the chamfered portion 9 described below.
This means that the inner diameter dimension is regulated. In addition, a chamfered portion 9 having a conical concave shape, which is a guide surface portion inclined in a direction in which the diameter increases toward the opening edge, is formed at the open end of the small-diameter hole portion 12 over the entire circumference. Further, in the case of the present invention, the diameter of the elastic material forming the O-ring 6 is A, and the large-diameter portion 1 is located from the base end side edge of the locking groove 5.
B is the axial dimension up to the leading edge of the large-diameter hole 1;
When the axial dimension of No. 3 is C and the axial dimension of the chamfer 9 is D, the dimensions A to D of these parts are regulated so as to satisfy the relationship of C + D> A + B. The axial dimension E of the large-diameter portion 11 is equal to or smaller than the axial dimension C of the large-diameter hole portion 13 (E ≦ C).

In the case of the piping joint device of the present invention configured as described above, the dimensional restriction of each part as described above (C + D> A
+ B), when the cylindrical portion 4a provided in the first joint element 1a is inserted into the circular hole 8a provided in the second joint element 2a, Before the stopped O-ring 6 reaches the small-diameter side edge of the chamfer 9,
The distal end of the large-diameter portion 11 provided at the base end portion of the cylindrical portion 4a is connected to the large-diameter hole portion 13 provided at the open end of the circular hole 8a.
To enter. The large-diameter hole portion 13 has an inner diameter dimension that allows the large-diameter portion 11 to be inserted without large backlash. For this reason, after the leading end of the large diameter portion 11 enters the large diameter hole 13, a part of the leading edge of the cylindrical portion 4 a (the small diameter portion 10) in the circumferential direction and the circular hole 8 a (the above Small diameter hole 12)
When the center axis of the cylindrical portion 4a is inclined with respect to the center axis of the circular hole 8a about the contact portion (point P ') with the inner peripheral surface of the lock, as shown in FIG. Before a part of the base edge of the concave groove 5 in the circumferential direction abuts on the chamfered part 9, a part of the outer circumferential surface of the large diameter part 11 in the circumferential direction is formed in the large diameter hole 13. Hit the circumference.

As a result, the degree of inclination of the central axis of the cylindrical portion 4a with respect to the central axis of the circular hole 8a becomes small, and a part of the small-diameter side edge of the chamfered portion 9 in the circumferential direction becomes the O-ring. 6 can be prevented from penetrating deeply into the locking groove 5. Therefore, a part of the chamfered portion 9 in the circumferential direction of the small-diameter side edge does not strongly crush the O-ring 6. Along with this, a part of the O-ring 6 in the circumferential direction does not largely protrude from the locking groove 5 in the diameter direction. Therefore, as shown in FIG.
Even if the cylindrical portion 4a is further pushed into the circular hole 8a from the state where the central axis of the O-ring is tilted, a part of the O-ring 6 is partially connected to the base end edge of the locking groove 5 and the chamfered portion 9. Will not be bitten between. Therefore, it is possible to effectively prevent the O-ring 6 from being damaged during the assembling operation.

In the illustrated example, the diameter of the large-diameter side edge of the chamfer 9 is smaller than the diameter of the large-diameter hole 13. However, in the case of the present invention, the dimensional restrictions (C
+ D> A + B), the diameter of the large-diameter side edge of the chamfer 9 is equal to the diameter of the large-diameter hole 13.
That is, the large diameter side edge of the chamfer 9 and the large diameter hole 13
The same operation and effect as in the case of the above-described illustrated case can be obtained even when the end edge is continued as it is.

[0019]

Since the piping joint device of the present invention is constructed and operates as described above, it is possible to effectively prevent the O-ring from being damaged during the assembling operation. In particular, even when the connection work is performed in a situation where there are many obstacles such as an engine room and the insertion portion of the cylindrical portion cannot be visually observed, the above-described O is also required.
The damage to the ring can be effectively prevented. For this reason, the airtightness and liquid tightness of the pipe connection can be reliably maintained.

[Brief description of the drawings]

FIG. 1 is a partial cross-sectional view showing an example of an embodiment of the present invention in a state before a column provided in a first joint element is inserted into a circular hole provided in a second joint element.

FIG. 2 is a partial cross-sectional view showing a stage in the middle of inserting a cylindrical portion into a circular hole in a state where the central axis of the cylindrical portion is inclined with respect to the central axis of the circular hole.

FIG. 3 is a partial cross-sectional view showing a conventional pipe joint device in a state where a cylindrical portion provided in a first joint element is inserted into a circular hole provided in a second joint element.

FIG. 4 is a partial cross-sectional view showing a stage in the middle of inserting the cylindrical portion into the circular hole in a state where the central axis of the cylindrical portion is inclined with respect to the central axis of the circular hole.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1, 1a 1st joint element 2, 2a 2nd joint element 3 Flange part 4, 4a Column part 5 Locking groove 6 O-ring 7 Mounting surface 8, 8a Circular hole 9 Chamfer part 10 Small diameter part 11 Large diameter part 12 Small diameter hole 13 Large diameter hole 14 Piping 15 Flow hole

Claims (1)

[Claims] A first coupling element connectable to an end of the pipe; and a second coupling element coupleable to the first coupling element. A flange portion for connecting an end portion of the pipe, a cylindrical portion protruding from one surface of the flange portion, and a communication between the distal end surface of the cylindrical portion and the other surface of the flange portion. A flow hole for flowing the flowing fluid, a locking groove formed all around the intermediate portion outer peripheral surface of the cylindrical portion, and an O-ring locked in the locking groove. The second joint element includes a mounting surface, and a circular hole opened in the mounting surface and through which the fluid that flows through the pipe through which the cylindrical portion can be inserted is freely inserted. In a certain pipe joint device, the cylindrical portion has a small-diameter portion at a distal end portion and a concentric portion at a proximal end portion with the small-diameter portion. In addition to the large diameter portion, the locking groove is formed on the outer peripheral surface of the middle portion of the small diameter portion. The circular hole is a small diameter hole portion into which the small diameter portion can be inserted, and the large diameter portion is inserted. A flexible large-diameter hole portion is formed concentrically with each other, and a guide surface portion is formed over the entire circumference at the open end of the small-diameter hole portion, the guide surface portion being inclined in a direction in which the diameter increases toward the opening edge. A is the diameter of the O-ring, B is the axial dimension from the proximal end of the locking groove to the distal end of the large diameter portion,
When the axial dimension of the large-diameter hole is C and the axial dimension of the guide surface is D, these dimensions A to D are C
A piping joint device characterized by satisfying a relationship of + D> A + B.