JP3344002B2 - Refrigerant piping connection fitting - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a refrigerant pipe joint for connecting a refrigerant pipe through which a refrigerant flows to form a refrigerant flow path in a refrigeration cycle.

[0002]

2. Description of the Related Art As a conventional technique, a refrigerant pipe connecting joint shown in FIG. 10 is generally used. This connection joint 10
Numeral 0 denotes a so-called nut and union type connection joint.
(Union) and the other refrigerant pipe 10
Nut 104 rotatable on refrigerant pipe 101 at the end of 3
Is provided, and the bolt 102 and the nut 104 are fastened using two spanners, so that two refrigerant pipes 10 are provided.
1 and 103 are connected. However, as described above, the nut and union type connection joint 100 uses two spanners at the time of assembling.
Since a space is required for operating the spanner by entering two spanners, there is a problem that the assembly is difficult in a narrow space.

As means for solving this problem, FIG.
And a refrigerant pipe connection joint 110 shown in FIG. 12 is known. In this technique, an end of the refrigerant pipe 101 is connected to a fixed block 111, and the fixed block 111 is fixed to a connection target 112 with a bolt 113 (connecting tool).
The refrigerant pipe 101 connected to the fixed block 111 and the internal passage 114 provided in the connection object 112 are connected only by the operation of the bolt 113.

When a refrigerant pipe connecting joint 110 for connecting a refrigerant using a fixed block 111 needs to bend a refrigerant passage vertically near the connecting joint 110, as shown in FIG. The bent refrigerant pipe 101 is fixed. However, this FIG.
According to the technique described in (1), the height (height of the connection joint 110) h2 between the connection surface 115 of the fixed block 111 and the end of the refrigerant pipe 101 becomes large. When it is necessary to reduce the height between the connection surface 115 of the fixed block 111 and the end of the refrigerant pipe 101, a vertical refrigerant passage 116 is formed in the fixed block 111 by cutting as shown in FIG. Thus, the height h3 of the connection joint 110 is reduced.

[0005]

However, by forming a vertical coolant passage 116 in the fixed block 111 by cutting as shown in FIG.
The manufacturing cost of the fixed block 111 is increased, and as a result, the manufacturing cost of the refrigerant pipe connection joint 110 is increased.

[0006]

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a refrigerant pipe connecting joint having a low connecting joint height and a low manufacturing cost.

[0007]

Means for Solving the Problems The refrigerant pipe connecting joint of the present invention employs the following technical means. The refrigerant pipe connection joint includes a fixed block fixed to a connection object provided with an internal passage through which the refrigerant flows, and a refrigerant pipe supported by being inserted into the fixed block. Is fixed to the object to be connected, whereby the refrigerant pipe and the internal passage are connected. And the said refrigerant | coolant piping is provided with the bending part with which the bending radius is small and bent in the L-shape on the side connected with the said internal passage, and the periphery of the side connected with the said internal passage further than this bending part. , Equipped with an annularly protruding ring seal portion,
The fixed block includes a bent accommodating portion that accommodates at least the inner curved portion of the bent portion, and a ring accommodating portion that accommodates the ring seal portion on a side connected to the connection target.

[0008]

The refrigerant pipe is bent in an L-shape with at least the inside of the bent portion being housed in the fixed block. The fixed block is sandwiched between the inside of the bent portion and the seal ring portion, and the fixed block and the refrigerant pipe are fixed.

[0009]

As described above, according to the refrigerant pipe connection joint of the present invention, the bent portion of the refrigerant pipe is bent into an L-shape with a small bending radius, and at least the inside of the bent portion is housed in the fixed block. Therefore, the height from the joint surface of the fixed block to the end of the refrigerant pipe, that is, the height of the connection joint can be reduced. Further, since the refrigerant passage is bent vertically by bending the refrigerant pipe, a refrigerant pipe connection joint that vertically bends the refrigerant passage near the connection joint can be manufactured at low cost.

[0010]

Next, a refrigerant pipe connecting joint of the present invention will be described with reference to an embodiment shown in the drawings. FIGS. 1 and 2 show an embodiment of the present invention. FIG. 1 is a side view of a refrigerant pipe connection joint, and FIG. 2 is a top view of the refrigerant pipe connection joint. Refrigerant pipe connection fitting 1
Is used when connecting the refrigerant passages of the vehicle refrigeration cycle, and includes a fixed block 4 fixed to the connection object 2 by bolts 3 (connecting tools);
And a refrigerant pipe 5 supported in a state where the end is inserted through the refrigerant pipe. The connection object 2 is connected to the refrigerant pipe connection joint 1, and has a female screw portion 6 for fastening the bolt 3, a concave portion 8 into which the connection end portion 7 of the refrigerant pipe 5 is inserted, and a refrigerant pipe. The refrigerant pipe 5 and the internal passage 9 are connected by providing an internal passage 9 that communicates with the connection block 5 and fixing the fixed block 4 to the connection target 2.

The refrigerant pipe 5 is an aluminum pipe, and has a bent portion 10 which is bent in an L-shape with an inner bending radius of substantially 0 on the side connected to the internal passage 9. That is, the side of the refrigerant pipe 5 connected to the internal passage 9 is formed in an elbow shape. The refrigerant pipe 5 is provided with a ring seal portion 11 protruding in an annular shape around the side connected to the internal passage 9 further than the bent portion 10. Also, the refrigerant pipe 5
An O-ring groove 12 that is annularly recessed is provided further around the end portion than the ring seal portion 11.
Inside, an O-ring 13 for sealing is mounted.

The fixed block 4 is a block made of aluminum and has a bolt insertion hole 15 through which the bolt 3 is inserted, and a pipe insertion hole 16 through which the connection end 7 of the refrigerant pipe 5 is inserted. The side of the pipe insertion hole 16 that comes into contact with the connection target 2 is a ring housing 17 that covers the ring seal 11.
Is provided. The tube insertion hole 16 on the side different from the ring housing 17 is provided with a bent housing 18 that covers the inner curved portion 10 a of the bent portion 10 of the refrigerant pipe 5. Then, the ring seal portion 11 comes into contact with the inside of the ring housing portion 17, and the inner curved portion 10 a of the refrigerant pipe 5 is
8, the fixed block 4 is sandwiched between the ring seal portion 11 and the inner curved portion 10a of the refrigerant pipe 5,
The fixed block 4 and the refrigerant pipe 5 are fixed.

[Manufacturing Method] Next, a method of manufacturing the main part of the refrigerant pipe connecting joint 1 will be described. First, the vicinity of the end of the extruded aluminum refrigerant pipe 5 is formed into an L-shaped elbow shape having a small inside bending radius by a shearing technique or the like. On the other hand, the fixed block 4 having the bolt insertion hole 15 and the pipe insertion hole 16 is formed by cutting from an aluminum block body, by pressing cold forging, or by die casting.

Next, the end of the refrigerant pipe 5 is inserted into the pipe insertion hole 16 of the fixed block 4, and the bent accommodation portion 1 is
8 is fixed to the inner curved portion 10a. At this time, the connection end 7 of the refrigerant pipe 5 projects from the fixed block 4.
Subsequently, an O-ring groove 12 is formed in the refrigerant pipe 5 protruding from the fixed block 4 by using a press working technique or the like, and a ring seal portion 11 is formed in the ring accommodating portion 17. When the ring seal portion 11 is formed, the fixed block 4 is strongly sandwiched between the inner curved portion 10 a of the refrigerant pipe 5 and the ring seal portion 11. Thereby, the fixed block 4 and the refrigerant pipe 5 are mechanically and firmly fixed. Then, the O-ring 1 is inserted into the O-ring groove 12.
3, the refrigerant pipe connection joint 1 is completed.

[Connection of refrigerant pipe connection joint 1] Next, an example of connection of the refrigerant pipe connection joint 1 will be described. Connection object 2
Of the refrigerant pipe 5 protruding from the fixed block 4
Is inserted. Next, the bolt 3 is inserted into the bolt insertion hole 15 of the fixed block 4 and the bolt 3
Is screwed into the female screw portion 6 to be connected, and the bolt 3 is tightened with one tightening tool such as a spanner. Thus, the connection between the refrigerant pipe 5 and the internal passage 9 of the connection target 2 is completed.

[Effects of the Embodiment] In the refrigerant pipe connection joint 1 of the present embodiment, the refrigerant pipe 5 is bent into an L-shape having an inner bending radius of almost 0 near the connection end 7 of the refrigerant pipe 5. Since the inner curved portion 10a is fixed to the fixed block 4 while being covered with the fixed block 4, the height from the joint surface of the fixed block 4 to the end of the refrigerant pipe 5, that is, the height h1 of the connection joint 1 (See FIG. 1) can be kept very small. Further, since the refrigerant passage is bent vertically by bending the refrigerant pipe 5, the refrigerant pipe connection joint 1 that bends the refrigerant passage vertically near the connection end 7 can be manufactured at low cost.

[Second Embodiment] FIG. 3 is an exploded view of a refrigerant pipe connecting joint 1 showing a second embodiment. In this embodiment, the fixing block 4 is divided into two parts, a first block 4a and a second block 4b, and fixed using screws 21.
The division surface of the fixed block 4 is provided along the tube insertion hole 16. With this technology, the refrigerant pipe 5 having the bent portion 10, the ring seal portion 11, and the O-ring groove 12 formed therein
Can be assembled to the fixed block 4.

[Third Embodiment] FIGS. 4 and 5 show a third embodiment. FIG. 4 is a sectional view of a refrigerant pipe connecting joint 1.
FIG. 5 is a top view of the refrigerant pipe connection joint 1. In this embodiment, the fixing block 4 is formed of a resin (for example, nylon resin, polypropylene resin, polyoxymethylene resin, epoxy resin, polyester resin, or the like). Around the bent portion 10 of the refrigerant pipe 5 in which the seal portion 11 and the O-ring groove 12 are formed, it is formed by a resin molding technique.

Fourth Embodiment FIGS. 6 and 7 show a fourth embodiment. FIG. 6 is a side view of a refrigerant pipe connecting joint 1.
FIG. 7 is a top view of the refrigerant pipe connection joint 1. In this embodiment, the pipe insertion hole 16 of the aluminum fixed block 4 is used.
And the aluminum refrigerant pipe 5 by brazing 2
2 and joined by welding techniques such as welding.

[Fifth Embodiment] FIGS. 8 and 9 show a fifth embodiment. FIG. 8 is a side sectional view of the refrigerant pipe connection joint 1, and FIG. 9 is an exploded view of the refrigerant pipe connection joint 1. . In this embodiment, the bent portion 10, the ring seal portion 11, the O-ring groove 1
2 is attached to the fixed block 4 and the fixed block 4 and the refrigerant pipe 5 are fixed by a joining technique such as brazing or welding, or by caulking, etc. Is provided with a guide portion 23 for guiding the bent portion 10 of the refrigerant pipe 5 into the pipe insertion hole 16 from the ring housing portion 17 side. Then, the outer curved portion 10b of the bent portion 10 of the refrigerant pipe 5 is fixed from the guide portion 23 in contact with the fixed block 4, and the fixed block 4 and the refrigerant pipe 5 are fixed by brazing 22, welding technology, or caulking technology. Are joined together.

[Modification] In the above embodiment, the refrigerant pipe made of aluminum is shown as an example of the material of the refrigerant pipe. However, a refrigerant pipe made of other materials such as copper, brass, and stainless steel may be used. . Similarly, as an example of the material of the fixed block, aluminum and resin have been described as examples, but other materials such as copper, brass, and stainless steel may be used similarly to the refrigerant pipe. Although a bolt is shown as an example of the connection tool, other means such as a screw or an engagement structure that engages by fitting may be used. Although the example in which the fixing block is fixed to the connection target with one bolt has been described, the fixing block may be fixed to the connection target using a plurality of connection tools. Although an example in which one refrigerant pipe is fixed to the fixing block is shown, a plurality of refrigerant pipes may be fixed and provided so as to connect a plurality of refrigerant passages by one assembly. The example in which the O-ring groove is formed in the connection portion of the refrigerant pipe is shown.
The ring groove may be eliminated, and the O-ring may be mounted adjacent to the ring seal portion.

[Brief description of the drawings]

FIG. 1 is a side view of a refrigerant pipe connection joint (first embodiment).

FIG. 2 is a top view of a refrigerant pipe connection joint (first embodiment).

FIG. 3 is an exploded view of a refrigerant pipe connection joint (second embodiment).

FIG. 4 is a side sectional view of a refrigerant pipe connection joint (third embodiment).

FIG. 5 is a top view of a refrigerant pipe connection joint (third embodiment).

FIG. 6 is a side view of a refrigerant pipe connection joint (fourth embodiment).

FIG. 7 is a top view of a refrigerant pipe connection joint (fourth embodiment).

FIG. 8 is a side sectional view of a refrigerant pipe connection joint (fifth embodiment).

FIG. 9 is an exploded view of a refrigerant pipe connection joint (fifth embodiment).

FIG. 10 is a cross-sectional view of a refrigerant pipe connection joint (prior art).

FIG. 11 is a sectional view of a refrigerant pipe connection joint (prior art).

FIG. 12 is a cross-sectional view of a refrigerant pipe connection joint (prior art).

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Refrigerant piping connection joint 2 Connection object 3 Bolt (connector) 4 Fixing block 5 Refrigerant piping 9 Internal passage 10 Bent part 10a Inside curved part 10b Outside curved part 11 Ring seal part 17 Ring accommodating part 18 Curved accommodating part

──────────────────────────────────────────────────続 き Continuing from the front page (72) Yoshitaka Kuroda, 1-1-1, Showa-cho, Kariya-shi, Aichi Japan Inside Denso Corporation (72) Inventor Keiichi Isogai 1-1-1, Showa-cho, Kariya-shi, Aichi Japan Denso Corporation (56) References Japanese Utility Model Sho 59-185486 (JP, U) Japanese Utility Model Sho 55-86193 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) F16L 43/00 F16L 41 / 08

Claims (1)

(57) [Claims] 1. A fixed block fixed to a connection object provided with an internal passage through which a refrigerant flows by a connector, and a refrigerant pipe supported in a state of being inserted through the fixed block. In the refrigerant pipe connection joint in which the refrigerant pipe and the internal passage are connected to each other by fixing the refrigerant pipe to the connection object, the refrigerant pipe has a small bending radius and an L-shape on a side connected to the internal passage. In addition to the bent portion, a ring seal portion protruding in an annular shape around the side connected to the internal passage further than the bent portion, wherein the fixed block has at least an inner bent portion of the bent portion. A refrigerant accommodating portion for accommodating the ring seal portion on the side connected to the object to be connected. Piping connection fitting.