JP2733647B2 - Pipe connection device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pipe connecting device used for piping of a heat exchanger such as a condenser or an evaporator of a car air conditioner and a tank such as a liquid receiver.

[0002]

2. Description of the Related Art The applicant has previously proposed the following pipe connection device (Japanese Patent Application No. Hei 6-535).
No. 91).

That is, as shown in FIGS. 29 and 30,
The pipe connection device has a cylindrical insertion portion (53) provided with an annular protrusion (51) on the outer periphery of a base end portion, and has an inner diameter equal to the outer diameter of the insertion portion (53) and is close to the distal end. Two opposing holes (55) are formed in the peripheral wall (54a) and the peripheral wall at the base end is formed.
(54a) A cylindrical receiving portion (54) having an inner surface provided with a receiving portion (54b) with which the annular projection (51) of the insertion portion (53) abuts, and a hole portion
(55) have two arcuate elastic legs (57) fitted in an inwardly protruding state from the outside at opposing positions where their concave curved surfaces face each other, and the inner surface of the arcuate elastic legs has an inclined surface (57a). ), And the inclined surface (57a) of the arc-shaped elastic leg (57) of the stopper (60) faces the pipe insertion side. The hole of the receiving part (54) in the state
(55), and the insertion portion (53) is inserted into the receiving portion (54) until the annular projection (51) passes through the arc-shaped elastic leg (57), whereby the insertion portion (53) is inserted. The annular projection (51) of the socket (54)
Arc-shaped elastic legs (57) of inner receiving part (54b) and stopper (60)
The insertion part (53) and the receiving part (54)
Are provided at the connection ends of the two pipes (62) and (63) to be connected, respectively, and the two arc-shaped elastic legs (5) of the stopper (60) are provided.
At the end of 7), an inward L-shaped bent portion (61) was provided.

As shown in FIGS. 33 and 34,
A pipe connecting device in which the stopper (70) is composed of only two opposing arc-shaped projections (71) and the stopper (70) is mounted on the receiving portion (72) is also considered.

[0005]

In the case of the pipe connecting device shown in FIGS. 29 and 30, the inward L-shaped bent portion (61) is provided at the tip of the two arc-shaped elastic legs (57) of the stopper (60). ), The mounting of the stopper (60) on the socket (54) requires that the two arc-shaped elastic legs (57) be largely separated to the left and right.

[0006] In the case of the above pipe connection device, FIG.
As can be seen in FIG. 5, the stopper (60) is provided at its head (64) and at the L-shaped bent portion (61) at the top and bottom of the socket (54).
(54c) is a form that embraces only the stopper (60) in the receptacle (54) when used for piping such as a condenser in a car air conditioner due to vibrations when the vehicle is running.
Tended to lose stability. In addition, the tensile stress of the pipe causes the head (64) between the arc-shaped elastic legs (57) of the stopper.
Because it concentrates on the arc-shaped elastic legs on both sides (57)
However, there was a tendency that the stopper (60) was opened right and left and the stopper (60) fell off.

On the other hand, in the case of the pipe connecting device shown in FIGS. 33 and 34, the stopper (70) of the crosspiece (72a) of the socket (72) has a small allowance (K), so that the stopper ( 70)
However, there is a problem that it easily falls off from the receiving part (72).

An object of the present invention is to provide a pipe connection device in which a stopper can be easily attached to a receiving portion and the stopper can be stably held after the attachment of the stopper.

[0009]

A pipe connecting device according to the present invention comprises a pipe having an insertion portion provided with an annular projection near a terminal, and a hole formed in a peripheral wall of a cylindrical portion for receiving the insertion portion. A member having a receiving portion provided with a receiving portion for receiving an annular projection when the insertion portion is inserted on the inner surface, and an elastic member having an arc-shaped ridge fitted into the hole of the receiving portion in an inwardly protruding state. A pipe connecting device having a stopper, wherein after insertion of the insertion portion into the receiving portion, the annular projection of the insertion portion is locked by the arc-shaped ridge of the stopper, the stopper extends in the axial direction of the pipe and receives the stopper. When mounted on the cylindrical portion of the mouth portion, a portion that exceeds 180 ° from the mounting direction is provided with a holding portion formed in at least an arc shape along the outer peripheral surface of the cylindrical portion.

It is preferable that both ends of the holding portion are formed shorter than ends on the fitting side of the arc-shaped ridges.

It is preferable that the holding portion has a C shape for holding the cylindrical portion of the receiving portion.

The arcuate ridge of the stopper is provided with an inclined surface for receiving the insertion portion on the side where the pipe is inserted, and a locking surface for locking the annular projection of the pipe after insertion of the pipe is provided on the side opposite to the inclined surface. Have been.

The pipe connection device according to the present invention can be applied not only to connection of pipes, but also to connection of outlets and inlet pipes in a header portion of a condenser, connection of pipes at entrances and exits of various pressure vessels, and the like.

Examples of the material of the stopper having elasticity include nylon 66, nylon 610, nylon 66, or the like mixed with glass fiber or talc.

[0015] Two holes are provided on the peripheral wall so as to face each other.
It is preferable to provide two arc-shaped ridges of the stopper on the inner surface of the portion to be embraced corresponding to the hole. However, the number of holes and arc-shaped ridges is arbitrary, and three holes or the like may be provided for each.

[0016]

In the pipe connection device of the present invention, the arc-shaped ridge of the stopper is previously fitted in the hole of the receiving portion in an inwardly protruding state, and the insertion portion is inserted into the receiving portion, whereby the insertion portion is inserted. The annular projection of which is provided with an inclined surface and a locking surface on the arc-shaped ridge, pushes the arc-shaped ridge outward against the elastic force of the stopper, and forms the arc-shaped ridge. It is allowed to enter the inside of the receptacle along the slope. Then, the annular projection of the insertion portion passes through the arc-shaped ridge and abuts against the reception portion on the inner surface of the peripheral wall of the receiving portion, and at the same time, the arc-shaped ridge of the stopper returns to its original position due to elasticity. The annular projection is sandwiched and fixed between the receiving portion of the receiving portion and the locking surface of the arc-shaped ridge of the stopper, and the engagement between the inserting portion and the receiving portion establishes a pipe connection.

According to the present invention, the stopper extends in the axial direction of the pipe, and when the stopper is mounted on the cylindrical portion of the receiving portion, at least a portion exceeding 180 ° from the mounting direction of the cylindrical portion has at least the cylindrical portion. Since the holding portion is formed in an arc shape along the outer peripheral surface, when the arc-shaped convex ridge of the stopper is fitted into the hole of the receiving portion and the stopper is attached to the receiving portion, the stopper is not attached. Since the holding portion holds the cylindrical portion of the receiving portion, the stopper can be stably mounted on the outer peripheral surface of the receiving portion. And
When a force is applied in the direction of opening the stopper, the force is distributed and applied to the entire stopper. When the stopper is mounted on the cylindrical portion of the receiving portion, the force is applied from the mounting direction by 18 degrees.
Since the arc-shaped portion exceeding 0 ° is hooked on the socket, the stopper is difficult to open and is hooked on the outer surface of the socket, so that the stopper is securely prevented from falling off. it can.

When the stopper holding portion is C-shaped, the stopper holding portion holds the cylindrical portion of the receiving portion over substantially the entire circumference. Therefore, the stopper can be more stably mounted on the outer peripheral surface of the receiving portion.

In addition, when both ends of the stopper holding portion are formed shorter than the end on the fitting side of the arc-shaped ridge, first, when the stopper is mounted on the receiving portion, The fitting end of the arc-shaped ridge is fitted into one end of the hole of the socket, and the fitting end of the arc-shaped ridge is slid to the other end of the hole, The arc-shaped ridge is smoothly fitted into the hole.

[0020]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a pipe connection device according to the present invention will be described with reference to the drawings. 1 to 7, a pipe connecting device has a cylindrical insertion portion (3) provided with an annular projection (1) on the outer periphery of a base end portion, and an inner diameter equal to the outer diameter of the insertion portion (3). And two opposing holes in the peripheral wall (4a) from the tip
A receiving part (4b) for receiving the annular projection (1) of the insertion part (3) is provided on the inner surface closer to the base end than the cylindrical part (4A) having the (5) and the hole (5). The mouth (4) and the inner surface of the C-shaped holding portion (10a) that holds the cylindrical portion (4A) of the receiving portion (4) are fitted into the hole (5) of the receiving portion (4). Two arcuate ridges (7a)
Are provided in opposition and have a stopper (10) having elasticity, the hole (5) of the socket (4) has two sides (5a) (5b) perpendicular to the axial direction, Hook part (10a) of stopper (10)
Is formed to extend in the axial direction of the pipe (11), and the insertion portion (3) is provided on the pipe insertion side of the arc-shaped ridge (7a) of the stopper (10).
There is provided an inclined surface (7b) for receiving the groove, and a locking surface (7e) for locking the annular projection (1) after the insertion of the insertion portion (3) is provided on the opposite side of the inclined surface (7b), The arcuate ridge (7
a) is fitted into the hole (5) of the socket (4) with the inclined surface (7b) of the arc-shaped convex strip (7a) facing the pipe insertion side, and is inserted into the socket (4). The insertion part (3) has an annular projection (1)
(7a) until it passes, the annular projection (1) of the insertion part (3) is inserted into the receiving part (4b) on the inner surface of the receiving part (4) and the stopper (1).
The arc-shaped ridge (7a) of (0) is sandwiched and fixed between the locking surfaces (7e).

The above-mentioned insertion part (3) is provided at the connection end of the pipe (11) to be connected, and the above-mentioned insertion part (3) is provided at the connection end of the other pipe (12) to which this pipe (11) is connected. Port
(4) is provided.

Further, at both ends of the holding portion (10a) of the stopper (10), extended portions (7c) of the arc-shaped ridges (7a) are provided so as to protrude, that is, the holding portion (10a) The both ends are formed shorter than the end on the fitting side of the arc-shaped ridge (7a). Further, a hook (7d) is provided on a portion of the arc-shaped ridge (7a) opposite to the extension (7c).

In the drawing, reference numeral (2) denotes an O-ring mounted in the concave groove (3a) of the insertion portion (3).

In this embodiment, the stopper (10) is made of a fiber reinforced plastic using a mixture of nylon 66 and nylon 610 as a matrix and glass fibers as a filler. Further, the insertion portion (3), the receiving portion (4), and the pipes (11) and (12) are all made of an aluminum alloy.

As shown in FIG. 2, the port (4) is provided with a pipe.
The pipe (12) is fixed to the distal end of the pipe (12) by caulking, and the flange (12a) of the pipe (12) forms a receiving section (4b). Hole
(5) is formed in a long hole shape, and a cross section (4c) is formed between the two hole portions (5).

The holding portion (10a) of the stopper (10) is shown in FIG.
As shown in FIG. 2, the width of the hole (5) is wider than the distance (L) between the two sides (5a) and (5b) perpendicular to the axial direction. (7a) is provided.

In this embodiment, the holding portion of the stopper (10)
(10a) is C-shaped, but as shown in FIG.
When the stopper (10) is attached to the cylindrical part (4A) of the receiving part (4), the part that exceeds 180 ° from the mounting direction (arrow direction)
It is sufficient that (A) is at least a circular arc along the outer peripheral surface of the cylindrical portion (4A).

According to the pipe connecting device of this embodiment, the arc-shaped ridge (7a) of the stopper (10) is previously inserted into the hole (5) of the socket (4).
By inserting the insertion part (3) into the socket part (4), the annular projection (1) of the insertion part (3) is
0) while opening the opposing arc-shaped ridges (7a) against the elastic force of (0), along the inclined surface (7b) of the arc-shaped ridges (7a), the receiving portion.
(4) You can go inward. Then, the annular projection (1) of the insertion portion (3) passes through the arc-shaped ridge (7a) and comes into contact with the receiving portion (4b) on the inner surface of the peripheral wall of the receiving portion (4). As a result of the arcuate ridges (7a) resiliently returning in the approaching direction, the annular projection (1) of the insertion portion (3) becomes circular with the receiving portion (4) of the receiving portion (4) and the stopper (10) of the peripheral wall. It is fixed by being sandwiched between the locking surfaces (7e) of the arc-shaped ridges (7a), and by the engagement of the insertion portion (3) and the receiving portion (4),
The connection between the pipe (11) and the pipe (12) is made.

When the stopper (10) is attached to the receiving portion (4), first, the extension (7c) of the arc-shaped ridge (7a) is connected to the receiving portion (4).
Into the upper end (5c) of the hole (5) and extend the extension (7c).
By simply sliding the hole toward the lower end (5d) of the hole (5), the arc-shaped ridge (7a) can be smoothly fitted into the hole (5).

Then, the holding portion (10a) of the stopper (10)
Has a width approximately twice as large as the distance (L) between the two sides perpendicular to the axial direction of the hole (5) of the receiving portion (4). ) Insert the arc-shaped ridge (7a) on the inner surface
(4) into the hole (5) and insert the stopper (10) into the socket
When mounted on (4), as shown in Fig. 5, stopper (10)
The holding part (10a) is the cylindrical part (4A) in the receiving part (4).
Is embraced over substantially the entire circumference of the peripheral wall (4a). Therefore, the stopper (10) can be stably mounted on the outer peripheral surface of the cylindrical portion (4A). More specifically, when piping such as an evaporator in a car air conditioner is made using the pipe connection device of the present embodiment, when the receiving portion (4) vibrates with the vibration of the vehicle while traveling, the The stopper (10) holding the cylindrical portion (4A) of the receiving portion (4) moves integrally with the outer peripheral surface of the cylindrical portion (4A) in close contact therewith. It does not come off.

In addition, the stopper (10) in the above embodiment
Has excellent toughness and heat resistance because it is made of nylon 66 and nylon 610 and glass fiber as a reinforcing material, and has durability against many chemicals including oils. Therefore, when the pipe connection device of the present embodiment is used for pipe connection of a condenser for an air conditioner, a liquid receiver and the like arranged in an engine room of an automobile, a metal such as calcium chloride used as a road deicing agent is used. Even if halide adheres to the stopper (10), the stopper (10)
Does not deteriorate and does not crack, maintains a high strength at all times, and has no risk of the stopper coming off.

An engaging groove (10b) is provided on both sides of the outer surface of the holding portion (10a) of the stopper (10) except for the central portion, and the engaging groove (10b) As shown in FIG. 2, the elastic claw (N) of the sealing cap (C) is fitted into the engagement groove (10b) when the sealing cap (C) is put on.

FIGS. 8 to 19 show the engaging groove (10b) on the outer peripheral surface of the holding portion (10a) of the stopper (10) in the above embodiment.
An example in which no is provided is shown. The stopper (10A) without the engagement groove (10b) is stably mounted in the socket (4), similarly to the stopper (10) in the above embodiment.

The reference numerals of the respective parts are the same as those in the above embodiment.

In this embodiment, the stopper (10A) is stably mounted as in the above embodiment. in this regard,
Further details will be described.

Both right and left arc-shaped ridges (7a) of the stopper (10A)
As shown in FIG. 12, the hook (7d) in
As a result of sandwiching the cross section (4c) of (4) from both sides, the stopper (10
A) is hooked on the socket (4).

Then, the arc-shaped ridge (7a) of the stopper (10A)
In addition to the above-described hooking of the hooking section (7d) in FIG.
As shown in FIG. 19, when the stopper is attached to the receiving portion (4), the holding portion (10a) of the stopper contacts the peripheral wall (4a) of the cylindrical portion (4A) in the receiving portion (4). Touching and holding part (10a)
Are elastically deformed from the opening widths (D) at both ends to (d) and pushed open, and finally mounted. Then, in order for the attached stopper to come off, a force for elastically deforming the holding portion (10a) of the stopper from its opening width (D) to (d) is required as in the case of the mounting. Therefore, the stopper does not come off due to vibration or the like. Also, hold the stopper (1
0a) embraces the cylindrical portion (4A) of the receiving portion (4), so that the allowance of the stopper to the receiving portion (4) is further enlarged as a whole.

FIG. 20 shows another embodiment of the stopper in the pipe connecting device of the present invention. The stopper (13) has basically the same shape as the stopper of the above embodiment, but the holding portion (13a) Is thicker than the holding portion (10a) of the stopper (10) of the above embodiment, and is made of nylon 66.

Next, the second moment of area of the stopper (10) of FIG. 1 and the stopper (13) of FIG. 20 of the pipe connection device of the present invention and the stoppers of the pipe connection devices of Comparative Examples 1 and 2 described below. The displacement, the tensile strength and the durability of the stopper were tested by the finite element method. Hereinafter, these will be described.

As shown in FIGS. 31 and 32, the pipe connecting device of Comparative Example 1 has an arcuate elastic leg (37) inserted into a slot-shaped opposing hole (35) in a socket (34). (37) and head
A stopper (38) having (32) is mounted, and an insertion portion (33) having an annular projection (31) is inserted into the receiving portion (34). Then, at the connection end of one pipe (36), a receiving part (34)
Is provided, and an insertion portion (33) is provided at the connection end of the other pipe (39).
Is provided. That is, in the pipe connection device of Comparative Example 1, only the stopper (38) is different from the stoppers (10) and (13) of FIGS. 1 and 20, and the other structure is substantially the same.

The pipe connection device of Comparative Example 2 is the one described in the prior art and has the structure shown in FIGS. 29 and 30. The pipe connection device of Comparative Example 2 also has a stopper (6
Only the shape of 0) is substantially different from each embodiment.

The stoppers of Comparative Examples 1 and 2 are all made of nylon 66.

The second moment of area is for the load in the width direction of each stopper. The displacement amount (FEM displacement amount) by the finite element method was determined to be good when the displacement amount was 0.25 mm or less, and as poor when the displacement amount exceeded 0.25 mm.

In the tensile strength test, each pipe connected by the pipe connecting device of each comparative example and each example was pulled in directions opposite to each other by a tensile strength tester, and it was inspected whether the pipes came off. In this case, the tensile strength required for this type of pipe connection device is 725.5 N (74
kgf) or more was regarded as good, and the value below this value was regarded as bad.

In the durability test, a fluid was repeatedly press-fitted 150,000 times into a pipe connected by a pipe connection device, and the airtight performance and the presence or absence of deformation were inspected. Then, the case where there was no leakage or deformation of the fluid was regarded as good, and the case where one of them occurred was regarded as bad.

The test temperature is 120 ° C. in each case. 1
20 ° C. is based on the assumption of the temperature in the engine room when the vehicle is running.

The test conditions and results are shown in the following table.
In the table, “○” means good and “x” means bad.

[0048]

[Table 1] According to the test results shown in the above table, the stopper (10) of FIG. 1 and the stopper (13) of FIG.
It is recognized that the next moment is high, the displacement is small, the tensile strength is high, and the durability is excellent.

FIG. 21 and FIG. 22 show an example of using the pipe connecting device of the present invention for connecting an outlet pipe in a header of a condenser for a car air conditioner.

Specifically, the header (1) in the condenser (14)
5) is provided with a receiving portion (16), a stopper (18) is attached to a hole (17) of the receiving portion (16), and a connection end of the outlet pipe (19) has an annular projection ( The insertion part (21) having the (20) is provided, and the insertion part (21) of the outlet pipe (19) is inserted into the receiving part (16) of the header (15) and fixed by the stopper (18). It has a structure to be.

FIGS. 23 and 24 show an example of using the pipe connection device of the present invention for connecting a liquid introduction pipe and a liquid discharge pipe in a head portion of a liquid receiver.

More specifically, the liquid inlet and the liquid outlet of the head (23) of the liquid receiver (22) are respectively connected to the liquid inlet (23).
a) and (23b) are provided, and the holes (2
A stopper (25) is attached to 4), and an annular projection (27) is provided at the connection end of the liquid introduction pipe (26a) and the liquid discharge pipe (26b).
a) an insertion portion (28a) (28b) having (27b) is provided,
Insert the pipes (28) into the sockets (23a) (23b) of the head (23).
a) (28b) is inserted and fixed by the stopper (25).

FIG. 25 shows an example in which the pipe connection device of the present invention is applied to the piping of an expansion valve in an evaporator. In this case, the block type expansion valve (41) has two ports.
(42a) and (42b) are provided, and at the connection ends of the two refrigerant flow pipes (46a) and (46b) to be connected to the receptacles (42a) and (42b), insertion portions (43a) and (43b) are provided, respectively. 43b) is formed. An inlet pipe (44a) and an outlet pipe (44b) are connected to the block type expansion valve (41) via a mounting flange (45). In the figure, (48) is the mounting flange
The fixing bolt (45) is shown.

FIG. 26 shows another embodiment of the stopper in the pipe connecting device according to the present invention, wherein the holding portion (29a) of the stopper (29) is C-shaped, and the hole of the receiving portion (4) is formed. (5) has a width wider than the distance (L) between the two sides perpendicular to the axial direction as in the case of the stopper (10) in the above embodiment, but the stopper (29) of this embodiment has a circular shape. An arc-shaped ridge (29b) is provided on one side edge of the inner surface of the holding portion (29a).

FIG. 27 shows still another embodiment of the stopper in the pipe connection device of the present invention, and a projection (49a) is provided on the outer peripheral surface of the stopper (49). In this case, the stopper (49) is covered with a sealing cap (47) shown in FIG.
The projection (49a) on the outer peripheral surface of the stopper (49) fits into the slit (47a) of the sealing cap (47).

[0056]

According to the pipe connecting device of the present invention, the stopper has at least a portion extending in the axial direction of the pipe and exceeding 180 ° from the mounting direction when the stopper is mounted on the cylindrical portion of the receiving portion. Since the holding portion is formed in an arc shape along the outer peripheral surface of the cylindrical portion, when the arc-shaped ridge of the stopper is fitted into the hole of the receiving portion, and the stopper is attached to the receiving portion. Since the holding portion of the stopper holds the receiving portion, the stopper can be stably mounted on the outer peripheral surface of the receiving portion.

When a force in the direction of opening the stopper is applied, the force is dispersed and applied to the entire stopper, and when the stopper is mounted on the cylindrical portion of the receiving portion, it exceeds 180 ° from the mounting direction. Since the arc-shaped portion is hooked on the receiving portion, the stopper is difficult to open and is hooked on the outer surface of the receiving portion, so that the stopper can be reliably prevented from falling off. Therefore, when piping such as an evaporator of a car air conditioner is performed by using the pipe connection device of the present invention, there is no possibility that the stopper comes off the receiving portion due to vibration of the automobile or the like.

When the stopper holding portion is C-shaped, the stopper holding portion holds the cylindrical portion of the receiving portion over substantially the entire circumference. Therefore, the stopper can be more stably mounted on the outer peripheral surface of the receiving portion.

In addition, in the case of the pipe connection device of the present invention,
Since an inward L-shaped bent portion such as a stopper in a conventional pipe connection device is not provided, it is not necessary to open the stopper widely left and right when mounting the stopper on the receiving portion. Therefore, the stopper can be easily mounted.

When both ends of the stopper are formed to be shorter than the end on the fitting side of the arc-shaped ridge, first, when the stopper is mounted on the receiving portion, the holding portion of the stopper is circular. By simply inserting the fitting-side end of the arc-shaped ridge into one end of the hole of the receiving portion and sliding the fitting-side end of the arc-shaped ridge to the other end of the hole, the circle is formed. The arcuate ridge is smoothly fitted into the hole.

[Brief description of the drawings]

FIG. 1 is a perspective view showing one embodiment of a pipe connection device of the present invention.

FIG. 2 is a horizontal sectional view showing a connection state between pipes.

FIG. 3 is a horizontal sectional view of a stopper.

FIG. 4 is a front view of a stopper.

FIG. 5 is a right side view showing a mounted state of a stopper.

FIG. 6 is a right side view of the stopper.

FIG. 7 is a left side view of the stopper.

FIG. 8 is a perspective view showing another embodiment of the pipe connection device of the present invention.

FIG. 9 is a horizontal sectional view showing a connection state of pipes by the pipe connection device of FIG. 8;

FIG. 10 is a front view showing a connection state between pipes by the pipe connection device of FIG. 8;

FIG. 11 is a bottom view showing the connection state of the pipes.

12 is a sectional view taken along line XII-XII in FIG.

FIG. 13 is a front view of a stopper in the pipe connection device of FIG. 8;

14 is a sectional view taken along line FF in FIG.

FIG. 15 is a sectional view taken along line GG in FIG.

FIG. 16 is a side view showing only the holding portion of the stopper.

17 is a side view showing a state before the holding section in FIG. 16 is attached to the socket section.

18 is a side view showing a state in which the holding portion in FIG. 16 is being attached to the receiving portion.

19 is a side view showing a state after the holding portion in FIG. 16 is attached to the receiving portion.

FIG. 20 is a right side view showing an embodiment in a case where a stopper is made thick in the pipe connection device of the present invention.

FIG. 21 is a front view showing a usage example when the pipe connection device of the present invention is used for pipe connection of a condenser.

FIG. 22 is a sectional view taken along line HH in FIG. 17 showing a relationship between a pipe to be connected and a stopper.

FIG. 23 is a sectional view of a main part showing an example of use in a case where the pipe connection device of the present invention is used for pipe connection of a liquid receiver.

FIG. 24 is a side view of the receiver in FIG. 19;

FIG. 25 is a front view showing a usage example when the pipe connection device of the present invention is used for piping of an evaporator.

FIG. 26 is a front view showing another embodiment of the stopper according to the present invention.

FIG. 27 is a perspective view showing still another embodiment of the stopper according to the present invention.

FIG. 28 is a sectional view of a sealing cap.

FIG. 29 is a perspective view showing a conventional pipe connection device.

FIG. 30 is a vertical sectional view showing the pipe connection state.

FIG. 31 is a perspective view showing a pipe connection device of Comparative Example 1.

FIG. 32 is a vertical sectional view showing the pipe connection state.

FIG. 33 is a perspective view showing another conventional example of a stopper.

FIG. 34 is a vertical sectional view showing the mounting state of the stopper in FIG. 31.

[Explanation of symbols]

 (1) Annular protrusion (3) Insertion part (4) Reception part (4A) Cylindrical part (4a) Peripheral wall (4b) Reception part (5) Hole part (7a) Arc-shaped ridge (7b) Inclined surface (7c ) Extension (7e) Locking surface (10) Stopper (10a) Clamp

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Nobuyuki Okuda, Inventor: 6,224, Kaiyamacho, Sakai City, Showa Aluminum Co., Ltd. 72) Inventor Koichi Inoue, 224 Kaiyama-cho, Sakai-shi, Showa Aluminum Co., Ltd. (56) Reference: Japanese Utility Model Application Hei 5-22985 (JP, U) Japanese Utility Model Hei 7-794 (JP, Y2) 1-27378 (JP, Y2)

Claims (1)

(57) [Claims] A pipe (11) having an insertion portion (3) provided with an annular projection (1) near a terminal, and a hole in a peripheral wall (4a) of a cylindrical portion (4A) for receiving the insertion portion (3). A member having a receiving part (4) provided with a receiving part (4b) for receiving the annular projection (1) when the insertion part (3) is inserted on the inner surface thereof; An elastic stopper (10) having an arc-shaped ridge (7a) fitted into the hole (5) of the portion (4) in an inwardly protruding state, and to the receiving portion (4) of the insertion portion (3). After the insertion, the annular projection of the insertion part (3)
In the pipe connection device in which (1) is locked by the arc-shaped ridge (7a) of the stopper (10), the stopper (10) extends in the axial direction of the pipe and receives the stopper (10) at the receiving portion (4). Cylindrical part of
The part (A) that exceeds 180 ° from the mounting direction when attached to (4A) is at least in close contact with the outer peripheral surface of the cylindrical part (4A). Prepare and hug
(10a) has both ends on the fitting side of the arc-shaped ridge (7a).
A pipe connection device having a holding portion, which is formed shorter than an end portion .