JP4270860B2 - Flexible hose and method for manufacturing flexible hose - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a flexible hose used in a refrigerant passage of a refrigeration cycle for vehicles.
[0002]
[Prior art]
Conventionally, what is indicated by patent documents 1 is known as a flexible hose used for a refrigerant passage etc. of a refrigeration cycle for vehicles.
[0003]
This flexible hose has a double-pipe structure of an outer hose made of rubber and an inner hose made of rubber that is loosely inserted into the outer hose at a predetermined interval. By constructing as a low-pressure refrigerant passage connected to the opening, and configuring the inside of the inner hose as a high-pressure refrigerant passage connected to the compressor discharge port of the refrigeration cycle, the contact area between the hose and the atmosphere is reduced, and the inner hose By making the outer hose a low-pressure fluid passage with a relatively small leakage amount and a high-pressure fluid passage with a large amount of leakage, the amount of refrigerant leakage from the entire flexible hose and the amount of diffusion into the atmosphere can be extremely reduced. It is something that can be done.
[0004]
[Patent Document 1]
Japanese Patent No. 2595578
[Problems to be solved by the invention]
However, in the above prior art, although the shape of the base formed at the end of the flexible hose is shown, the means for assembling the base at the end of the outer hose and the inner hose is not disclosed, and the inner hose is not disclosed. It was difficult to assemble the base at the ends of the outer hose and the inner hose in a state where the central axis of the outer hose and the central axis of the outer hose coincided.
[0006]
Therefore, an object of the present invention is to provide a flexible hose having a double pipe structure and having a joint structure in which the central axis of the inner hose and the central axis of the outer hose coincide with each other at the end.
[0007]
[Means for Solving the Problems]
The invention according to claim 1 includes an outer hose, an inner hose inserted into the outer hose, and a joint structure provided at an end portion, which is used as a refrigerant passage in a vehicle refrigeration cycle. and a flexible hose made within fitting disposed outside the fitting and the inner hose end is disposed outside the hose end, with a cylindrical inner connection portion having a groove on the peripheral And a plurality of holding pieces extending in the radial direction so that the outer diameter dimension is slightly smaller than the inner diameter of the outer pipe joint, and an inner hose holding part fixed to the end of the inner hose, an outer connecting portion having a said inner pipe joint inner connecting portion is in close contact connected to the inner connecting portion includes a cylindrical shape, a groove in the circumferential direction by a sealing O-ring mounted in a groove on the peripheral, A holding piece holding portion to which the inner pipe joint is held; Comprising an outer hose anchorage portion which is fixedly held to the end on the side hose, the outer fitting to the outer connecting portion is in close contact connected to the outer connecting portions by sealing O-rings mounted in grooves on the peripheral The joint structure is constituted by the inner pipe joint, which is fixed to the inner hose end, is inserted into the outer pipe joint, which is fixed to the outer hose end, and the outer peripheral surface of the holding piece holding part is added. The holding piece is fixed to the inner wall surface of the holding piece holding portion by being tightened.
[0008]
The invention according to claim 2 includes an outer hose, an inner hose inserted into the outer hose, and a joint structure provided at an end portion, which is used as a refrigerant passage of the vehicle refrigeration cycle. A flexible hose comprising an outer pipe joint disposed at the outer hose end and an inner pipe joint disposed at the inner hose end; A plurality of holding pieces extending in the radial direction so that the outer diameter dimension is slightly smaller than the inner diameter of the outer pipe joint, and an inner hose holding part fixed to the end of the inner hose Provided with an inner pipe joint, an outer connection part connected to the outside connection part, a holding piece holding part for holding the inner pipe joint, and an outer hose holding part fixed to an end of the outer hose. And from the outer pipe joint having a cylindrical shape Wei hand structure is constituted, the holding piece anchorage portion is disposed on the outer hose persist portion, inside the outer fitting which is fixedly held in the outer hose end, the inner tube fitting which is fixedly held on the inner hose end There is inserted, characterized in that the outer hose anchorage part the holding strips an outer peripheral surface to the holding piece anchorage portion wall by caulking of is fixedly held.
[0010]
In the invention according to claim 3, the inner hose holding portion provided in the inner pipe joint having a cylindrical shape is fixed to the end portion of the inner hose, the inner hose is inserted into the outer hose, and the end of the outer hose is inserted. By crimping the outer peripheral surface of the outer pipe joint having a cylindrical shape at the part, the outer hose holding part is held at the outer hose end , and the holding piece holding part inner wall surface provided in the outer pipe joint is A plurality of holding pieces extending in the radial direction of the inner pipe joint are fixed so that the outer diameter dimension is slightly smaller than the inner diameter of the outer pipe joint.
[0011]
【The invention's effect】
According to the first aspect of the present invention, the inner pipe joint fixed to the inner hose end portion is inserted into the outer pipe joint fixed to the outer hose end portion, and the outer peripheral surface of the holding piece holding portion is crimped. By holding the holding piece on the inner wall surface of the holding piece holding portion, a flexible hose having a double pipe structure and a joint structure in which the central axis of the inner hose and the central axis of the outer hose coincide with each other at the end. Can be provided.
[0012]
According to the second aspect of the present invention , the inner pipe joint fixed to the inner hose end portion is inserted into the outer pipe joint fixed to the outer hose end portion, and the outer peripheral surface of the holding piece holding portion is crimped. By holding the holding piece on the inner wall surface of the holding piece holding portion, a flexible hose having a double pipe structure and a joint structure in which the central axis of the inner hose and the central axis of the outer hose coincide with each other at the end. Can be provided.
In addition, the holding piece holding portion is disposed in the outer hose holding portion, and the holding piece is held on the inner wall surface of the holding piece holding portion by caulking the outer peripheral surface of the outer hose holding portion, thereby reducing the assembly man-hours. it can.
[0014]
According to the third aspect of the present invention, the outer pipe joint outer peripheral surface is caulked to the end of the outer hose, so that the holding piece of the inner pipe joint is firmly held, so that the double pipe structure can be formed with less assembly man-hours. A flexible hose having a joint structure in which the central axis of the inner hose and the central axis of the outer hose coincide with each other at the end can be manufactured.
[0015]
DETAILED DESCRIPTION OF THE INVENTION
A flexible hose as an embodiment of the present invention will be described in detail with reference to the drawings. FIG. 1 is a sectional view showing a state in which an inner hose 13 is inserted into an outer hose 11 in the flexible hose 1 according to the first embodiment of the present invention, and FIG. 2 is a sectional view showing a state in which the flexible hose 1 is completed. FIG. 3 is a view of the flexible hose 1 as seen from the end face side.
[0016]
The flexible hose 1 of the present embodiment is used as a refrigerant circulation path that circulates in a refrigeration cycle such as a vehicle air conditioner and a vehicle refrigeration apparatus.
[0017]
For example, in the case of a vehicle air conditioner, a compressor that compresses a refrigerant to high temperature and high pressure is installed on the engine side, and a condenser that cools the refrigerant in a high pressure state and an evaporator that expands the refrigerant and takes heat away from the surroundings. Installed on the car body side. Therefore, the compressor vibrates when the engine is started and during the engine operation, and moves differently from the vehicle body side. When the evaporator and the evaporator are connected, the hard pipe is damaged, so that the flexible hose 1 having flexibility has been conventionally used. Moreover, since the flexible hose 1 has flexibility, the assembly work at the time of vehicle mounting becomes easy, and it has been used conventionally.
[0018]
As shown in FIG. 1, the flexible hose 1 of the present embodiment includes an outer hose 11, an inner hose 13 inserted into the outer hose 11, and a joint structure 15 provided at the flexible hose end 2. The joint structure 15 includes an inner pipe joint 30 and an outer pipe joint 20.
[0019]
The inner pipe joint 30 is extended in the radial direction so that the outer diameter r is slightly smaller than the inner connection part 33 (not shown) connected to the inner connection part and the inner diameter R of the outer pipe joint 20 described later. A plurality of holding pieces 32 and an inner hose holding part 31 fixed to the end of the inner hose 13 are provided, and a cylindrical shape is provided.
[0020]
The outer pipe joint 20 includes an outer connection part 23 that is connected to the outer connection part (not shown), a holding piece holding part 22 that holds the inner pipe joint 30, and an outer part that is fixed to the end of the outer hose 11. The hose holding part 21 is provided and has a cylindrical shape. The inner tube connecting portion 33 and the outer tube connecting portion 23 are each formed with a groove on the circumference and fitted with a sealing O-ring (not shown), and are intimately connected to the inner connection portion and the outer connection portion (not shown), respectively. Is done.
[0021]
The inner hose holding portion 31 of the inner pipe joint 30 is inserted into the end portion of the inner hose 13, and the inner hose end portion 14 and the inner hose holding portion 31 are caulked and fixed together with the inner collar 34. A plurality of grooves 35 are provided on the outer peripheral surface of the inner hose holding portion 31 along the circumferential direction. Thereby, when the inner hose end 14 and the inner hose holding part 31 are caulked and fixed together with the inner collar 34, the inner peripheral surface of the inner hose end 14 is prevented from being caught in the groove 35 and the inner pipe joint 30 is prevented from falling off. is doing.
[0022]
In the outer hose 11, the outer hose holding portion 21 of the outer pipe joint 20 is inserted into the outer hose end portion 12, and the outer hose end portion 12 and the outer hose holding portion 21 are caulked and fixed together with the outer collar 24. A plurality of grooves 25 are provided on the outer peripheral surface of the outer hose holding portion 21 along the circumferential direction. Thereby, when the outer hose end 12 and the outer hose holding part 21 are caulked and fixed together with the outer collar 24, the inner peripheral surface of the outer hose end 12 is prevented from being caught in the groove 25 and the outer pipe joint 20 being prevented from falling off. is doing.
[0023]
Then, the inner hose 13 in which the inner pipe joint 30 is crimped and held is inserted into the outer hose 11 in which the outer pipe joint 20 is crimped and held so that the holding piece 32 is positioned inside the holding piece holding part 22. The holding piece 32 is held on the inner wall surface of the holding piece holding portion 22 by caulking the outer peripheral surface of the holding piece holding portion 22, and the state shown in FIGS. 2 and 3 is obtained, and the assembly of the flexible hose 1 is completed. .
[0024]
In the present embodiment, when the inner hose holding portion 31 is fixed to the inner hose end portion 14 and when the outer hose fixing portion 21 is fixed to the outer hose end portion 12, the inner collar 34 and the outer collar 24 are used. Although the caulking and fixing method is used, it is also possible to fix the inner hose fixing portion 31 to the inner hose end portion 14 using a band clamp or the like.
[0025]
Therefore, with the above configuration, it is possible to provide a flexible hose having a joint structure in which the central axis of the inner hose and the central axis of the outer hose coincide with each other while having a double pipe structure.
[0026]
As another aspect of the present embodiment, joint structures 15a and 15b as shown in FIGS. 4 and 5 can be provided. In the present embodiment as shown in FIG. 2, the joint structure 15 is formed such that the end of the inner connection portion 33 of the inner pipe joint 30 slightly protrudes from the end surface of the outer connection portion 23 of the outer pipe joint 20. In another embodiment as shown in FIG. 4, since the entire inner connection portion 33a is formed so as to protrude from the end surface of the outer connection portion 23a, it is easy to connect the joint structure 15a and the connected member not shown. can do.
[0027]
Moreover, in another aspect as shown in FIG. 5, the total length of the joint structure 15b is shortened and the flexible hose 1 is attached by forming the end face of the inner connecting portion 33b and the end face of the outer connecting portion 23a to coincide with each other. It can be installed even if there is no space in the position.
[0028]
Next, a flexible hose 1 ′ as a second embodiment of the present invention will be described in detail with reference to the drawings. FIG. 6 is a sectional view of a flexible hose 1 ′ according to the second embodiment of the present invention.
[0029]
As shown in FIG. 6, the flexible hose 1 ′ of the present embodiment is provided at the outer hose 11 ′, the inner hose 13 ′ inserted into the outer hose 11 ′, and the flexible hose end 2 ′. A joint structure 15 'is provided, and the joint structure 15' includes an inner pipe joint 30 'and an outer pipe joint 20'.
[0030]
The inner pipe joint 30 'extends in the radial direction so that the outer diameter dimension is slightly smaller than the inner connection part 33' coupled to the inner connection part (not shown) and the outer pipe joint 20 'described later. The plurality of holding pieces 32 'and the inner hose holding portion 31' fixed to the end portion of the inner hose 13 'are provided and have a cylindrical shape.
[0031]
The outer pipe joint 20 'includes an outer connection part 23' connected to the outer connection part (not shown), a holding piece holding part 22 'to which the inner pipe joint 30' is fixed, and an end part of the outer hose 11 '. The outer hose holding portion 21 'is fixed to the outer hose holding portion 21' of the outer pipe joint 20 ', and the holding piece holding portion 22' is disposed in the outer hose holding portion 21 '.
[0032]
The inner hose holding portion 31 'of the inner pipe joint 30' is inserted into the end portion of the inner hose 13 ', and the inner hose end portion 14' and the inner hose holding portion 31 'are clamped and held together with the inner collar 34'. Yes. A plurality of grooves 35 ′ are provided along the circumferential direction on the outer peripheral surface of the inner hose holding portion 31 ′. As a result, when the inner hose end portion 14 'and the inner hose holding portion 31' are caulked and fixed together with the inner collar 34 ', the inner peripheral surface of the inner hose end portion 14' is caught by the groove 35 'and the inner pipe joint 30'. Is prevented from falling off.
[0033]
A plurality of grooves 25 ′ are provided on the outer peripheral surface of the outer hose holding part 21 ′ along the circumferential direction. Thereby, when the outer hose end 12 'and the outer hose holding part 21' are caulked and fixed together with the outer collar 24 ', the inner peripheral surface of the outer hose end 12' is caught in the groove 25 'and the outer pipe joint 20'. Is prevented from falling off.
[0034]
The outer hose end 12 'is inserted into the outer collar 24' while the outer hose holding portion 21 'of the outer pipe joint 20' is inserted into the outer hose end 12 '. The inner hose 13 ′ with the inner pipe joint 30 ′ held by crimping is inserted so that the holding piece 32 ′ is positioned inside the outer hose holding part 21 ′ holding piece holding part 22 ′, and the outer hose holding part 21 ′ is held. The outer hose end 12 'and the outer hose holding portion 21' are clamped and held together with the outer collar 24 'by crimping the outer peripheral surface of the piece holding portion 22', and the holding piece is held on the inner wall surface of the holding piece holding portion 22 '. As a result, the assembly of the flexible hose 1 'is completed.
[0035]
In the present embodiment, when the inner hose holding portion 31 ′ is fixed to the inner hose end portion 14 ′ and when the outer hose fixing portion 21 ′ is fixed to the outer hose end portion 12 ′, the inner collar 34 ′, In addition, although the caulking and clamping method is used together with the outer collar 24 ', the inner hose clamping part 31' can be clamped to the inner hose end part 14 'using a band clamp or the like.
[0036]
Therefore, with the above configuration, it is possible to provide a flexible hose having a joint structure in which the central axis of the inner hose and the central axis of the outer hose coincide with each other while having a double pipe structure.
[0037]
Further, by assembling the outer pipe joint outer peripheral surface to the end portion of the outer hose, the holding piece of the inner pipe joint can be firmly held, thereby reducing the assembly man-hours.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view showing a state where an inner hose is inserted into an outer hose in the flexible hose according to the first embodiment of the present invention.
FIG. 2 is a cross-sectional view showing a completed state of the flexible hose according to the first embodiment of the present invention.
FIG. 3 is a view of the flexible hose according to the first embodiment of the present invention as viewed from the end surface side.
FIG. 4 is a perspective view showing another aspect of the joint structure portion of the first embodiment of the present invention.
FIG. 5 is a perspective view showing another aspect of the joint structure portion of the first embodiment of the present invention.
FIG. 6 is a cross-sectional view of a flexible hose according to a second embodiment of the present invention.
[Explanation of symbols]
1 ... flexible hose 2 ... flexible hose end (end)
DESCRIPTION OF SYMBOLS 11 ... Outer hose 12 ... Inner hose 15 ... Joint structure 20 ... Outer pipe joint 21 ... Outer hose holding part 22 ... Holding piece holding part 23 ... Outer connection part 30 ... Inner pipe joint 31 ... Inner hose holding part 32 ... Holding piece 33 ... Inner connection

Claims (3)

Used as a refrigerant passage in a vehicle refrigeration cycle, an outer hose (11), an inner hose (13) inserted into the outer hose (11), and a joint structure (15) provided at the end (2) A flexible hose (1) comprising:
An outer pipe joint (20) disposed at the end of the outer hose (11) and an inner pipe joint (30) disposed at the end of the inner hose (13);
An inner connection portion (33) having a cylindrical shape and having a groove on the circumference, and a plurality of holding pieces extending in the radial direction so that the outer diameter dimension is slightly smaller than the inner diameter of the outer pipe joint (20) (32) and an inner hose holding part (31) fixed to the end of the inner hose (13), and the inner connection part (33) by an O-ring for sealing attached to the groove on the circumference. The inner pipe joint (30) that is closely connected to the inner connection part;
An outer connection portion (23) having a cylindrical shape and having a groove in the circumferential direction, a holding piece holding portion (22) to which the inner pipe joint (30) is fixed, and an end portion of the outer hose (11) An outer hose holding part (21), and the outer pipe joint (20) in which the outer connection part (23) is tightly connected to the outer connection part by a sealing O-ring attached to the groove on the circumference. ) To form the joint structure (15),
An inner pipe joint (30) held at the end of the inner hose (13) is inserted into the outer pipe joint (20) held at the end of the outer hose (11), and the holding piece holding part (22 ), The holding piece (32) is fixed to the inner wall surface of the holding piece holding portion (22). Used as a refrigerant passage in a vehicle refrigeration cycle, an outer hose (11), an inner hose (13) inserted into the outer hose (11), and a joint structure (15) provided at the end (2) A flexible hose (1) comprising:
An outer pipe joint (20) disposed at the end of the outer hose (11) and an inner pipe joint (30) disposed at the end of the inner hose (13);
An inner connection part (33) coupled to the inner-side connection part, and a plurality of holding pieces (32) extending radially so that the outer diameter dimension is slightly smaller than the inner diameter of the outer pipe joint (20) And an inner hose holding portion (31) to be held on the end of the inner hose (13), and an inner pipe joint (30) having a cylindrical shape,
An outer connection portion (23) coupled to the outer connection portion, a holding piece holding portion (22) to which the inner pipe joint (30) is fixed, and an outer hose to be fixed to the end of the outer hose (11) The joint structure (15) is composed of an outer pipe joint (20) having a holding part (21) and having a cylindrical shape,
The holding piece holding portion (22) is disposed on the outer hose holding portion (21),
The inner pipe joint (30) held at the end of the inner hose (13) is inserted into the outer pipe joint (20) held at the end of the outer hose (11) ,
A flexible hose characterized in that the holding piece (32) is fixed to the inner wall surface of the holding piece holding section (22) by caulking the outer peripheral surface of the outer hose holding section (21). The inner hose holding portion (31) provided in the inner pipe joint (30) having a cylindrical shape at the end of the inner hose (13) is fixed,
Insert the inner hose (13) into the outer hose (11),
By crimping the outer peripheral surface of the outer pipe joint (20) having a cylindrical shape at the end of the outer hose (11), the outer hose holding part (21) is held at the end of the outer hose (11), The radius of the inner pipe joint (30) so that the outer diameter dimension is slightly smaller than the inner diameter of the outer pipe joint (20) on the inner wall surface of the holding piece holding portion (22) provided in the outer pipe joint (20). A method for manufacturing a flexible hose characterized by holding a plurality of holding pieces (32) extending in a direction.

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