JP2002250484A - Flexible tube - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a flexible tube which suppresses occurrence of cracks by making the stress of vibration dispersed. SOLUTION: A flexible tube 11 is provided with a bellows part 2, consisting of a bellow-shaped tube and with a tube body 11A which covers the outer periphery of the bellows part 2 and contains a cylindrical screen protective cover body 3, and a ring body 6a which is provided at both ends of the tube body 11A and fixes a part of the outer periphery of the protective cover body 3, an outer periphery of the bellows part 2 and a piping 4 connected to the bellows part 2. A ring body 6a is formed of a bell-mouth shape, in which the diameter is increased gradually, as going toward the tube body 11A from the connecting part 5 of the piping.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flexible tube in which a bellows-shaped tube is covered with a mesh-like protective cover.

[0002]

2. Description of the Related Art Conventionally, a flexible pipe is provided at a place where expansion and contraction is required in the middle of the pipe, for example, as a part of a refrigeration circuit, and a compressor mounted on a gantry and a flexible pipe fixed to the gantry. It is used as a flexible joint device in the middle of the pipe connecting the components.

FIG. 6 shows a state in which a conventional flexible pipe is connected to another pipe. As shown in FIG. 6, the flexible tube 1 includes a bellows portion 2 formed of a bellows-shaped tube, and a metal-made mesh-like cylindrical protective cover member 3 for covering and protecting the outer periphery of the bellows portion 2. And a ring body 6 that covers and reinforces the connection part 5 when the flexible pipe 1 is connected to another pipe (hereinafter referred to as connection pipe) 4. The ring body 6 is formed of a cylindrical pipe having a two-step inner diameter, and one inner diameter is loosely fitted to the outer circumference of the pipe main body 1A and the other inner diameter is loosely fitted to the outer circumference of the connection pipe 4.

When the flexible pipe 1 is connected to the connection pipe 4, a ring 6 is inserted into the connection pipe 4 so that the end of the connection pipe 4 and the end of the pipe body 1A are brought into contact with each other. The ring body 6 is moved to the connecting portion 5 and the ring body 6 is caulked and fixed so as to be in close contact with the outer periphery of the connecting portion 5.

[0005]

However, in such a conventional flexible pipe 1 with a protective cover body 3, a part of the flexible pipe 1 is cracked because vibration of a compressor or the like cannot be completely absorbed. There was a problem that gas inside leaked from the crack. This crack portion mainly occurs in the second to third places of the bellows valley from the end of the flexible pipe 1, and the cause of the crack is that the stress of vibration is concentrated in this portion. there were.

The present invention has been made in view of such circumstances, and an object of the present invention is to provide a flexible pipe in which a stress of vibration is dispersed and a crack is hardly generated.

[0007]

In order to achieve the above-mentioned object, a first aspect of the present invention is to provide a bellows-shaped tube comprising a bellows-shaped tube and a mesh-shaped cylindrical protective cover covering the outer periphery of the bellows. And a ring body provided at both ends of the tube body and fixing a part of the outer periphery of the protective cover body, the outer periphery of the bellows portion, and a pipe connected to the bellows portion. The ring body is formed in a bell mouth shape whose diameter increases from a connection portion of the pipe toward the pipe body.

According to a second aspect of the present invention, there is provided a tube main body comprising a bellows-shaped tube and a mesh-shaped protective cover covering the outer periphery of the bellows-shaped tube. A flexible pipe provided with a ring body that fixes a part of the outer periphery of the protective cover body, the bellows part outer circumference, and a pipe connected to the bellows part, between the bellows part outer circumference and the inside of the ring body. It is characterized by having a buffer material interposed.

According to a third aspect of the present invention, there is provided a tube main body comprising a bellows-shaped tube and a protective cover in the form of a mesh covering the outer periphery of the bellows-shaped portion. A flexible body provided with a ring body for fixing a part of the outer periphery of the protective cover body, the outer periphery of the bellows part, and a pipe connected to the bellows part, wherein the protective cover body has a mesh at the end of the pipe body. Are formed densely and the mesh of the central part is formed coarsely.

According to a fourth aspect of the present invention, there is provided a bellows portion formed of a bellows-shaped tube, and a tube body covering the outer periphery of the bellows portion and comprising a mesh-shaped protective cover body. A flexible pipe provided with a ring body that fixes a part of the outer periphery of the protective cover body, the outer periphery of the bellows portion, and a pipe connected to the bellows portion, wherein the bellows portion extends from an end to a predetermined position. Is constituted by a double tube.

According to a fifth aspect of the present invention, there is provided a tube main body comprising a bellows-shaped tube and a protective cover in the form of a mesh covering the outer periphery of the bellows-shaped tube. A flexible body provided with a ring body for fixing a part of the outer periphery of the protective cover body, the outer periphery of the bellows portion, and a pipe connected to the bellows portion, wherein the bellows portion has a coarse pitch of the bellows at the end portion. In addition, the pitch of the bellows at the center is made dense.

[0012]

Embodiments of the present invention will be described below with reference to the drawings.

[First Embodiment] FIG. 1 is an explanatory view showing a cross section of a part of a flexible tube according to a first embodiment of the present invention. Note that the same components as those in FIG. 6 are described with the same reference numerals.

In FIG. 1, a tube body 11A constituting a flexible tube 11 has a bellows portion 2 formed of a bellows-shaped tube having a predetermined length, and a metal or the like so as to cover and protect the outer periphery of the bellows portion 2. And a protective cover body 3 having a mesh cylindrical shape. When the connection pipe 4 is connected to the flexible pipe 1, a ring 6 a is provided to cover and reinforce the connection 5.

The ring body 6a is formed in a cylindrical pipe having a step, the inner diameter of the connecting pipe side is formed into a cylinder slightly larger than the outer diameter of the connecting pipe, and the inner diameter is enlarged at substantially the center of the ring body 6a. It is formed slightly larger than the outer diameter of the tube body 1A, and is formed in a trumpet-like shape with a diameter increasing from the center of the ring body 6a toward the tube body 11A.

When the pipe body 11A is connected to the connection pipe 4, the end of the connection pipe 4 is inserted into the connection pipe 4 in advance with the end of the ring body 6a facing the connection pipe. 2 and abut it against the end. Then, the ring body 6a is moved to the outer periphery of the connection part 5, and the ring body 6
a of the connecting pipe side is in close contact with the connecting pipe, and the ring body 6a
Is caulked and fixed such that the substantially central portion thereof is in close contact with the pipe main body 1A, and the connecting portion 5 is reinforced by the ring body 6a.

As described above, after the flexible pipe 1 is connected to the connection pipe 4 and the connection section 5 is covered with the bell-mouth-shaped ring 6a, the flexible pipe 1 and the connection pipe 4 are bent and deformed by vibration. In this case, since the inner peripheral surface of the ring body 6a curved in a trumpet shape and the outer peripheral surface of the tube body 11A opposed to the inner peripheral surface swing with a large circumferential width, stress concentrates on a part. Can be avoided. Thereby, it is possible to make the flexible pipe 11 hard to crack due to vibration.

[Second Embodiment] FIG. 2 is an explanatory view showing a cross section of a part of a flexible tube according to a second embodiment of the present invention.

In FIG. 2, a tube body 12A constituting a flexible tube 12 has a bellows portion 2 formed of a bellows-shaped tube having a predetermined length, and a metal or the like so as to cover and protect the outer periphery of the bellows portion 2. And a protective cover body 3 having a mesh cylindrical shape. The connection pipe 4 is connected to the flexible pipe 12.
Is provided with a ring body 6b which covers and reinforces the connection portion 5 when the connection is made.

The ring body 6b is formed in a two-stage cylindrical shape, the inside diameter at one end (connection pipe side) is formed slightly larger than the outside diameter of the pipe to be connected, and the center part to the other end ( It is formed slightly larger than the outer diameter of the pipe main body 12A. A buffer 21 is provided on the inner periphery of the pipe body 12A on the joint side.

When the pipe body 12A is connected to the connection pipe 4, the ring body 6b is slidably inserted into the pipe to be connected with the connection pipe side end of the ring body 6b facing. The end of the pipe to be fitted and the end of the bellows 2 are brought into contact with each other and brazed. Then, the ring body 6b is moved to the outer periphery of the connection portion 5, and the connection pipe side end of the ring body 6b is brought into close contact with the connection pipe, and the buffer member 2 at the joint side end of the ring body 6b.
1 is caulked and fixed so as to be in close contact with the outer periphery of the tube body 12A.

As described above, the flexible pipe 12 is connected to the connection pipe 4, the connection portion 5 is covered with the ring body 6b, and the cushioning material 21 is interposed between the pipe body 12A and the ring body 6b. When the pipe and the connecting pipe vibrate, the stress can be prevented from being dispersed and reduced by the buffer material 21 and concentrated on a part. As a result, the flexible pipe 12 that is unlikely to crack in the pipe body 12A
Can be

[Third Embodiment] FIG. 3 is an explanatory view showing a cross section of a part of a flexible pipe according to a third embodiment of the present invention.

In FIG. 3, a tube main body 13A constituting the flexible tube 13 has a bellows portion 2 formed of a bellows-shaped tube having a predetermined length, and a metal or the like so as to cover and protect the outer periphery of the bellows portion 2. And a net-like cylindrical protective cover 3a. When the connection pipe 4 is connected to the flexible pipe 13, a ring body 6 is provided to cover and reinforce the connection portion 5.

The protective cover 3a has a dense mesh at the end of the tube body 13A and a coarse mesh at the center of the tube body 13A.
By making both end portions of the tube body 13A softer than the center portion, deformation of the tube body 13A due to vibration is increased at the center portion.

As described above, since the protective cover 3a forms a dense mesh at the end of the tube body 13A and a coarse mesh at the center, the stress of vibration concentrated at the end is distributed to the center. As a result, it is possible to provide the flexible tube 13 that is difficult to crack.

Fourth Embodiment FIG. 4 is an explanatory view showing a part of a flexible tube in a cross section according to a fourth embodiment of the present invention.

In FIG. 4, a tube main body 14A constituting the flexible tube 14 has a bellows portion 2a formed of a bellows-shaped tube having a predetermined length, and a metal or the like so as to cover and protect the outer periphery of the bellows portion 2a. And a protective cover body 3 having a mesh cylindrical shape. When the connection pipe 4 is connected to the flexible pipe 14, a ring body 6 for covering and reinforcing the connection portion 5 is provided.

The tube of the bellows portion 2a is formed by a bellows-shaped double tube 22 from the end of the tube main body 14A to the center slightly from the portion covered by the ring body 6, and the center is formed by a single tube. Have been. Thereby, the bending stress at both ends of the pipe main body 14A is smaller than that at the center, and the deformation of the pipe main body 14A due to vibration is increased at the center of the pipe main body 14A.

As described above, since the bellows portion 2a is formed double at the end portion of the tube body 14A and single at the center portion, the stress of vibration concentrated at the end portion is dispersed at the center portion, and a crack is formed. A difficult flexible tube 14 can be provided.

[Fifth Embodiment] FIG. 5 is an explanatory view showing a cross section of a part of a flexible pipe according to a fifth embodiment of the present invention.

In FIG. 5, a pipe main body 15A constituting the flexible pipe 15 has a bellows portion 2b formed of a bellows-shaped tube having a predetermined length and a metal or the like so as to cover and protect the outer periphery of the bellows portion 2b. And a protective cover body 3 having a mesh cylindrical shape. When the connection pipe 4 is connected to the flexible pipe 15, a ring body 6 for covering and reinforcing the connection portion 5 is provided.

The bellows portion 2b is formed such that the pitch of the bellows at the end is coarse and the pitch of the bellows at the center is dense.
Since the tubes of the bellows portion 2b are made of the same material, the rigidity of both ends of the tube main body 15A is larger than that of the center portion.

As described above, by forming the pipe pitch of the bellows portion 2b coarsely at the end portion and densely at the center portion, the rigidity of the end portion becomes larger than that of the center portion. The stress of vibration concentrated on the flexible pipe 15 can be dispersed in the central portion, and the flexible pipe 15 can hardly crack.

Although the present invention has been described based on one embodiment, the present invention is not limited to this.

[0036]

As described above, according to the first aspect of the present invention, there is provided a pipe body comprising a bellows portion and a protective cover, and a pipe connected to both ends of the pipe body. It has a ring body that covers and fixes the connection part, and since the ring body is formed in a bell mouth shape with an enlarged diameter from the connection part of the pipe toward the pipe body, the stress of vibration is not concentrated on a part Can be distributed as follows.

According to the second aspect of the present invention, there is provided a ring having a pipe main body comprising a bellows portion and a protective cover body, and covering and fixing a connecting portion between pipes connected to both ends of the pipe main body. Since it has a body and the cushioning material is interposed between the ring body and the pipe main body, the vibration stress can be dispersed so as not to be concentrated on a part.

According to the third aspect of the present invention, there is provided a ring having a pipe main body comprising a bellows portion and a protective cover body, and covering and fixing a connecting portion between pipes connected to both ends of the pipe main body. The body has a protective cover body with a dense mesh at the end of the pipe body and a coarse mesh at the center, so that the stress of vibration is distributed to the center of the pipe body and not concentrated at the end. Can be

According to the fourth aspect of the present invention, there is provided a ring having a pipe main body comprising a bellows portion and a protective cover body, and covering and fixing a connecting portion between pipes connected to both ends of the pipe main body. Since the bellows between the end of the tube body and the predetermined position is composed of a double tube, the stress of vibration is distributed to the center of the tube body so that it does not concentrate on the end. Can be.

According to the fifth aspect of the present invention, there is provided a ring having a pipe main body comprising a bellows portion and a protective cover body, and covering and fixing a connecting portion between pipes connected to both ends of the pipe main body. It has a body, the bellows pitch at the end of the tube body is coarse, and the bellows pitch at the center is dense, so that the vibration stress is distributed to the center of the tube body so that it does not concentrate on the ends. be able to.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram showing a cross section of a part of a flexible tube according to a first embodiment of the present invention.

FIG. 2 is an explanatory diagram showing a cross section of a part of a flexible tube according to a second embodiment of the present invention.

FIG. 3 is an explanatory view showing a cross section of a part of a flexible tube according to a third embodiment of the present invention.

FIG. 4 is an explanatory view showing a cross section of a part of a flexible tube according to a fourth embodiment of the present invention.

FIG. 5 is an explanatory diagram showing a cross section of a part of a flexible tube according to a fifth embodiment of the present invention.

FIG. 6 is an explanatory diagram showing a cross section of a part of a conventional flexible pipe.

[Explanation of symbols]

 Reference Signs List 2 bellows part 2a bellows part of embodiment 4 3 protective cover body 3b protective cover body of embodiment 3 4 connection pipe 5 connection part 6 ring body 6a ring body of first embodiment 6b ring body of second embodiment 11 of first embodiment Flexible tube 11A Tube main body of Embodiment 1 12 Flexible tube of Embodiment 2 12A Tube main body of Embodiment 2 13 Flexible tube of Embodiment 3 13A Tube main body of Embodiment 3 14 Flexible tube of Embodiment 4 14A Tube of Embodiment 4 Main body 15 Flexible tube 15A of Embodiment 5 15A Tube main body 21 of Embodiment 5 Buffer material 22 Double tube

Continued on the front page F term (reference) 3H111 AA02 BA24 CA44 CB28 CC13 CC17 DA26 DB09 EA17 3J045 AA01 AA03 BA04 CB10 CB14 CB23

Claims (5)

[Claims] A bellows portion comprising a bellows-shaped tube, and a tube body comprising a mesh-like cylindrical protective cover covering the outer periphery of the bellows portion, provided at both ends of the tube body, to provide protection. In a flexible pipe having a ring body for fixing a part of an outer periphery of a cover body, a bellows part circumference, and a pipe connected to the bellows part, the ring body increases in diameter from a connection part of the pipe toward a pipe body. A flexible tube characterized by being formed into a bell mouth shape. 2. A bellows portion comprising a bellows-shaped tube, and a tube body comprising a meshed cylindrical protective cover covering the outer periphery of the bellows portion. In a flexible pipe provided with a ring body for fixing a part of the outer periphery of the cover body, a bellows part outer circumference, and a pipe connected to the bellows part, a buffer material is interposed between the bellows part outer circumference and the inside of the ring body. A flexible pipe characterized by the following. 3. A bellows portion comprising a bellows-shaped tube, and a tube body comprising a meshed cylindrical protective cover body which covers the outer periphery of the bellows portion. In a flexible pipe provided with a ring body for fixing a part of an outer periphery of a cover body, an outer periphery of a bellows portion, and a pipe connected to the bellows portion, the protective cover body may have a mesh at an end portion of the pipe body in the center, densely. A flexible pipe characterized in that the mesh of the part is formed roughly. 4. A tube main body comprising a bellows-shaped tube made of a bellows-shaped tube and a mesh-shaped tubular protective cover body which covers the outer periphery of the bellows-shaped tube. In a flexible pipe provided with a ring body for fixing a part of the outer periphery of the cover body, a bellows part outer circumference, and a pipe connected to the bellows part, the bellows part is a double pipe from an end to a predetermined position. Flexible tube characterized by comprising. 5. A tube body comprising a bellows-shaped tube formed of a bellows-shaped tube and a mesh-shaped tubular protective cover body covering the outer periphery of the bellows-shaped tube, and provided at both ends of the tube body. In a flexible pipe having a ring body for fixing a part of the outer periphery of the cover body, the outer periphery of the bellows portion, and a pipe connected to the bellows portion, the bellows portion has a rough pitch of the bellows at the end, A flexible pipe characterized by having a dense bellows pitch.