WO2003087647A1

WO2003087647A1 - Universal pipe joint

Info

Publication number: WO2003087647A1
Application number: PCT/JP2003/004832
Authority: WO
Inventors: Hiroyuki Aoki
Original assignee: Sanden Shoji Co., Ltd.
Priority date: 2002-04-18
Filing date: 2003-04-16
Publication date: 2003-10-23
Also published as: JP2004003629A; JP4235021B2; AU2003235184A1

Abstract

A universal pipe joint having bellows symmetrically disposed so that they are superposed when bent along the longitudinal center line of the joint, adapted to accommodate axial expansion-contraction displacement, bending displacement in a plane crossing the axis, and circumferentially forward and backward rotative displacement in a well-balanced manner, while mitigating the stress on each element to improve the durability and service life of the joint itself. To this end, the universal pipe joint is characterized in that right and left inclined bellows (1, 1) having a tubular appearance and consisting of a plurality of pleats inclined at predetermined angles of (θa, θb) between the opposite end connections (F, F) are spaced and opposed to each other with the direction of inclination reversed, symmetrically disposed so that they are superposed when bent along a center line (10) in the direction of the pipe length forming a base point for symmetry, thus constituting a joint structure (BK) consisting of a two-in-a-set combination bellows (bk2) such that two inclined bellows, right and left, form a set, thereby making it possible to omnidirectionally accommodate axial expansion-contraction displacement, bending displacement in a plane crossing the axis, and circumferentially forward and backward rotative displacement leading to distortion, in a well-balanced manner.

Description

Specification

Universal Fittings

TECHNICAL FIELD The present invention relates to a universal pipe joint widely available as a joint member. Background art

In the past, fittings such as pipes and fittings have been widely used as connection members in equipment such as tanks and piping, and they function as seismic isolation and vibration resistant structures. As a general shape, as shown in Fig. 5, there are many structures that incorporate bellows orthogonal to the tube axis.

Further, as shown in FIG. 6, there is disclosed a configuration in which a bellows shaft is provided concentrically with respect to the tube axis, and the bellows is inclined in one direction at a predetermined angle with respect to the tube axis. 1 1 2 8 7 3 5 5).

Further, as shown in FIG. 7, there is disclosed a configuration in which a one-direction inclined bellows and an orthogonal bellows are combined with the tube axis (see, for example, Japanese Patent Application Laid-Open No. 1 1 2 8 3 7 4). ).

In addition, as shown in FIG. 8, the bellows shaft itself is provided at a predetermined angle に対し; inclined with respect to the tube axis (for example, Japanese Patent Application Laid-Open No. 11 1 2 8 7 3 3) reference.).

However, in any of the above-mentioned conventional examples, since stress is generated only in a specific direction with respect to expansion displacement, bending displacement, and rotational displacement in the circumferential direction, its durability 'life is short in metal fatigue, There is a problem that improvement of the function is desired.

The present invention has been made in view of the above-described circumstances, and is disposed symmetrically in the left-right direction so as to overlap when the bellows are bent at the longitudinal center line of the joint. The axial expansion and contraction displacement, the bending displacement on the plane intersecting the axis, and the forward and reverse rotational displacement in the circumferential direction can be absorbed in a well-balanced manner, and the stress applied to each element is reduced.・ The purpose is to provide a universal joint that can improve the life. Disclosure of the invention

The technical contents of the present invention will be disclosed below.

(1) A flexible pipe joint having an external appearance in the form of a tube, and both ends of which are connected parts sandwiching the joint structure part, and a bellows made of a plurality of wedges inclined at a predetermined angle between the both end connected parts Are placed opposite each other in a symmetrical manner so that they overlap each other when they are folded back and forth across the center of the tubular longitudinal direction, which is the base point of the opposing position. Constructs a joint structure consisting of a combination of 2 types and a set of bellows, which can be used for axial expansion and contraction displacement, bending displacement on a plane intersecting with the axis, and circumferential rotational displacement for twisting. A universal joint that allows for a balanced absorption in all directions.

(2) A flexible pipe joint having an external appearance in the form of a tube, and both ends of which are connected parts sandwiching the joint structure part, and a bellows made of a plurality of wedges inclined at a predetermined angle between the both end connected parts Are disposed opposite to each other, and a bellows having a plurality of ridges perpendicular to the tube axis is provided at the central portion separated including the origin of the opposite position, and a tubular longitudinal direction serving as the origin of the opposite position. Are arranged symmetrically so that they overlap when folded at the boundary of the center line, and a joint structure consisting of a combination of three types of one set consisting of a central bellows and a left and right beveled bellows. And can be absorbed with good balance in all directions, such as axial expansion and contraction displacement, bending displacement on a plane intersecting the axis, and circumferential rotational displacement as twisting. Pipe fitting.

(3) In the case of the universal joint described in (1) or (2) above, left and right inclination A joint structure consisting of two types of combined bellows consisting of two types of bellows, or a central bellows, and a combination of three types of paired bellows consisting of three types of left and right inclined bellows. A universal pipe joint formed by connecting two or more sets of joint structure parts between two end connection parts.

(4) In the universal pipe joint according to any one of the above (1) to (3), the bellows is a universal pipe joint in which peak portions and valley portions forming a ridge are connected in a spiral. Brief description of the drawings

FIG. 1 is a side view showing the configuration of an essential part of an embodiment of a universal joint according to the first embodiment, and FIG. 2 is a side view showing the configuration of an essential part of an universal joint according to an embodiment 2. The figure is a principal part configuration side view showing the embodiment of the universal joint in the third embodiment, FIG. 4 is the principal part configuration side view showing the embodiment of the universal joint in the fourth embodiment, and FIG. A partially cutaway side view showing a main part configuration of a bellows joint having a bellows incorporating a bellows orthogonal to the tube axis in the prior art 1, FIG. 6 is a bellows shaft relative to the tube axis in the prior art 2 , And a partially cutaway side view showing the main configuration of the bellows joint in which the bellows is inclined in one direction at a predetermined angle with respect to the pipe axis, and FIG. 7 is a pipe axis in the conventional example 3. Of a bellows joint that has a combination of one-way inclined bellows and orthogonal bellows. Partially cutaway side view showing the main part configuration, FIG. 8 is a partial view showing the main configuration of a bellows joint in which the bellows shaft itself in the conventional example 4 is inclined at a predetermined angle α. The broken side views are shown respectively. BEST MODE FOR CARRYING OUT THE INVENTION

Hereinafter, an embodiment of a universal joint according to the present invention will be described. FIG. 1 shows an essential part of an embodiment of a universal joint according to the first embodiment. FIG. 2 is a side view of a main part configuration showing an embodiment of a universal joint in the second embodiment, and FIG. 3 is a side view of a main part configuration showing an embodiment of a universal joint in the third embodiment. Fig. 4 is a side view showing a configuration of an essential part of a universal joint according to a fourth embodiment, and Fig. 5 is a bellows joint having a bellows incorporating a bellows orthogonal to the tube axis in the conventional example 1 Fig. 6 shows that the bellows shaft is provided concentrically with respect to the tube axis in the prior art 2, and the bellows is inclined in one direction at a predetermined angle with respect to the tube axis. Fig. 7 is a partially cutaway side view showing the main part configuration of the bellows joint of the different construction, and Fig. 7 is a bellows joint of the construction in which the one-direction inclined bellows and the orthogonal bellows are combined with the pipe axis in the conventional example 3. FIG. 8 is a tube axis in the conventional example 4; I am a partially broken side view showing a main configuration of the configuration of the bellows joint digits set by the bellows shaft itself against a predetermined angle α inclined.

(Example 1)

Hereinafter, Example 1 will be described with reference to the drawings.

In FIG. 1, the external appearance is tubular, and it is a universal pipe joint having joints F and F at both ends sandwiching the joint structure Β, and a plurality of inclined joints between the both ends F and F. The left and right bevels 1 and 1 are separated from each other, for example, with the left side inclined 0a left and the right side inclined to the right in the figure. A joint structure consisting of two kinds of combination bellows bk 2 which are arranged symmetrically on left and right sides so as to overlap when folded at the center line 10 and which are two types of left and right inclined bellows 1 and 1 Part BK (Note that center line 10 is 1 2 of the longitudinal dimension L of the joint), axial expansion and contraction displacement, bending displacement on a plane intersecting the axis, and circumferential direction that becomes twisting To be able to absorb forward and reverse rotational displacements in all directions in a well-balanced manner. Pitch pa folds forming the lateral inclination bellows 1, 1, pb, height ha of the folds, hb, the number of folds n It is characterized in that the absolute values of a, nb and inclination angles 0 a, b, etc. of 襞 are configured to be the same value on the left and right.

As for the other symbols, 2 is a tubular portion other than a vent.

The operation will be described based on the above configuration.

By connecting the universal joint according to the present invention in the middle of equipment such as a tank or piping, the bellows is inclined in the opposite direction to vibration caused by earthquakes and other disasters, and the bellows are centered in the longitudinal direction of the joint. Because they are arranged on the left and right sides of the line, compared to the conventional one-way bevel bellows joint, the amount of displacement is offset or dispersed by the bellows whose reverse right and left slopes, and the stress applied to each element is reduced. As a joint, it is possible to absorb in a balanced manner enough for all directions, axial expansion / contraction displacement, bending displacement on a plane intersecting the axis, and circumferential rotational torsion displacement. Durability · Can improve the life.

(Example 2)

In the second embodiment, as shown in FIG. 2, in addition to the configuration of the first embodiment, a central portion, which is an intermediate portion of the left oblique bevel, is provided with a bellows formed of a plurality of weirs orthogonal to the tube axis. This is an example of a joint structure portion consisting of a combination of three types of combination bellows that is a pair of left and right inclined bellows sandwiching this central bellows-that is, the appearance is tubular, and the joint structure BK is sandwiched. A flexible pipe joint whose both ends are connected parts F and F, and the left and right inclined bellows 1 and 1 consisting of a plurality of wedges inclined at a predetermined angle between the both end connected parts F, F are separated in opposite inclination directions. And a bellows having a plurality of wedges orthogonal to the tube axis, including a base point of the facing position, and a center line of the tubular longitudinal direction as a starting point of the facing position. To be placed symmetrically on the left and right so that they overlap when Over's, structure the joint structure portion BK that in three lateral inclination bellows made of three set of combinations bellows bk 3, which forms one pair The structure is configured to be able to absorb axial expansion and contraction displacement, bending displacement on a plane that intersects the axis, and torsional and reverse rotational displacement in the circumferential direction in a balanced manner in all directions. It features.

In the case of the second embodiment, in addition to the operation of the first embodiment, it is an example provided with a function capable of responding flexibly and flexibly to displacement in all directions.

(Example 3)

In Example 3, in FIGS. 3 (a) and 3 (b), (a) is an example in the case where two or more sets of joint structure parts consisting of two kinds of combination bellows of Example 1 are connected. Yes, (b) is an example in the case where two or more sets of joint structure parts consisting of three types and one set of combination bellows in Example 2 are connected, and by combining them appropriately according to the installation conditions, It is possible to improve the effect more.

(Example 4)

The fourth embodiment is characterized in that, as shown in FIG. 4, the peaks and valleys forming the ridges are spirally connected unlike the bellows comprising a plurality of ridges. Each code is used by adding a '(dash) to the code of Example 1.

In the configuration, the spirally connected peak and valley portions 3 are disposed with their inclination directions reversed from side to side and separated by a predetermined dimension. Description of the same parts as in the first embodiment is omitted.

The universal joint according to the present invention is capable of absorbing displacement as a whole in a well-balanced manner as a result of the left-right symmetrical structure with the longitudinal direction of the pipe and the center of the pipe axis as the origin.

The operation is the same as that of the first embodiment, so the description will be omitted.

Also, in the drawing, the peak and valley forming the ridges are sharply bent. However, it is also possible to round the peaks and valleys so that the cross section has a radius of curvature.

Furthermore, in the present embodiment, 1) The connection portion may be any of a flange type, a screw type, or a ferrule type, and is not limited. 2) The material may be either an elastic material such as rubber or resin, or a metallic material such as stainless steel (sus). Especially in the case of a metallic material, minimize the metal fatigue as a joint. Can be applied widely, and it can be widely applied to chemical industry including petroleum related industry, nuclear industry, automobile industry, railway vehicle related, aircraft and ship related etc, not limited to general industry. The fittings will come out. Industrial Applicability

As described above, according to the present invention, the stress is dispersed or canceled laterally by being arranged symmetrically so as to overlap when the bellows is bent with the longitudinal center line of the joint as a boundary. Allows balanced absorption of axial expansion / contraction displacement, bending displacement on a plane intersecting the axis, and circumferential displacement in both directions, and reduces stress applied to each element. The durability of the joint itself · Life, ie, the limit of metal fatigue can be significantly improved, exhibiting the effect of being widely applicable to all industries.

Claims

The scope of the claims

1. A self-contained pipe joint having an external appearance in a tubular shape, and both ends of which are connected parts sandwiching a joint structure part, and beveled bellows consisting of a plurality of wedges inclined at a predetermined angle between the both end connected parts is inclined direction Are placed opposite each other in opposite symmetry so as to overlap when they are folded at the longitudinal center line of the tubular longitudinal direction, which is the base point of the opposite position. The joint structure consisting of two kinds of combinations of bellows is constructed, and the axial expansion / contraction displacement, the bending displacement on the plane intersecting the axis, A self-contained pipe joint characterized in that it can be absorbed in a balanced manner in all directions.

2. A self-contained pipe joint having an external appearance in a tubular shape, and both ends of which are connected parts sandwiching a joint structure part, and beveled bellows consisting of a plurality of wedges inclined at a predetermined angle between the both end connected parts is inclined direction Are oppositely spaced, and further, a bellows comprising a plurality of ridges perpendicular to the tube axis is provided in the spaced central portion including the base point of the opposite position, and the center of the tubular longitudinal direction to be the base point of the opposite position. They are arranged symmetrically so that they overlap when folded at the boundary of the line, and a joint structure consisting of a combination of three types and a combination of bellows consisting of three types of central bellows and left and right inclined bellows. It is configured to be able to absorb the expansion and contraction displacement in the axial direction, bending displacement on the plane intersecting the axis, and forward and reverse rotational displacement in the circumferential direction to become torsionally balanced in all directions. Features universal joint.

3. A flexible pipe joint according to claim 1 or 2, wherein a joint structure portion consisting of a combination of two types of combination bellows in two pairs of left and right inclined bellows, or a central bellows, left and right inclined bellows A universal pipe joint characterized in that two or more sets of joint structures each consisting of a combination of three types of combination bellows formed in one set of three types are connected between both end connection sections.

The universal joint according to any one of claims 1 to 3, wherein Z is a self-contained pipe joint characterized by spirally connecting the ridges and valleys that form the ridge.