JP2011208659A - Elbow joint - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an elbow joint of a small number of part items with a simple structure, by setting an angle position of a sleeve and a nut in an installed state by simple operation, by reducing a pressure loss in a flow passage, by being completely released from leakage of a welding part, a step height of a joining place and the occurrence of corrosion.SOLUTION: This elbow joint includes a body, the nut 2 installed by threadedly engaging with the body, the sleeve 3 interposed between an outer diameter surface of a tube connected to the body and an inner diameter surface of the nut, a first end part 11 of an elbow joint body 1 having an inner diameter substantially equal to an inner diameter of the tube, an extension part 7 in a second end part 12 of the body 1 and a cap screw part 6 rotatably fitted to the axis on the outer periphery of the extension part 7. As a first installation structure for regulating the sleeve 3 from escaping in the axial direction from the nut 2 and a second installation structure for regulating the cap screw part 6 from escaping in the axial direction from the extension part 7, a stop ring 4 is used, and a bend part 10 is provided for gradually turning the flow direction.

Description

  The present invention is a joint for connecting a tube that can be bent, such as a Teflon tube for flowing a paint for coating, and is particularly easy to install. It relates to an elbow joint with low loss.

  As a joint used for piping of pneumatic and hydraulic equipment, for example, a nut tightening type joint described in Patent Document 1 is known. Here, in order to fix pipes such as plastic tubes, copper pipes, steel pipes, and to eliminate co-rotation of the tube by tightening nuts during piping, a sleeve interposed between the joint body and the tube is used as a tube. It is a joint that does not stick to the sleeve, making it difficult to remove, or forgetting or losing the sleeve, or fixing it in the wrong mounting direction, and also integrating the sleeve and nut. There has been proposed a joint designed to improve work efficiency.

  However, the technique of Patent Document 1 is a joint that connects pipes substantially straight. Then, as a joint in which the nut tightening type structure shown here is applied to an elbow joint body, for example, the joint shown in FIG. 3 has been conventionally used. (Hereafter, this is called “conventional product”.)

However, the following points are noted for this conventional product.
(1) In the conventional joint, since it is necessary to fit the fixing screw part 6 so that it does not fall from the joint body 1, after fitting the screw part 6 to the extension part 7 of the joint, the extension part 7 is It was welded to the joint body 1. For this reason, in addition to the need for welding work, there are welded parts, so there is a small step at the joint part 9 on the inner surface of the flow path, resulting in a liquid pool, and leakage when there is insufficient welding. There must be liquid residue due to the occurrence of surface roughness. In addition, corrosion may occur at the weld 8.

(2) In the joint of the conventional product, there are steps 13, 14 at the connection part with the pipe, so that strong turbulent flow is generated in the pipe and the flow resistance becomes high, in addition to the component of the fluid flowing in the pipe Depending on etc., it may adversely affect its components and properties.

(3) The conventional joint has a structure in which the flow path on one end side 11 and the flow path on the other end side 12 intersect at a substantially right angle for manufacturing reasons, resulting in high pressure loss due to flow path resistance. .

JP 2003-227590 A

  Since the present invention does not require a welding process for manufacturing, the problem to be solved in the conventional product as described above is to solve the above-mentioned points of concern. It is completely freed from events such as occurrence, reduces pressure loss in the flow path, and allows easy setting of the angular position of the sleeve and nut in the installed state, and has a simpler structure and fewer parts An object is to provide an elbow joint that is economically advantageous from the viewpoint of manufacturing cost.

  In order to solve the above-mentioned problems, an elbow joint of the present invention includes an elbow joint body, a nut that is screwed to the elbow joint body, and an outer tube connected to the first end of the elbow joint body. A sleeve interposed between a radial surface and an inner diameter surface of the nut; a first end of the elbow joint body having an inner diameter substantially equal to an inner diameter of a tube connected to the elbow joint body; An elbow joint main body is provided with an extension portion at a second end of the elbow joint main body, and a male threaded portion that is rotatably fitted to the outer periphery of the extension portion with respect to the central axis of the extension portion. The first end portion of the tube includes a fixing structure for fixing the connecting end portion of the tube, a first assembly structure for restricting the sleeve from escaping from the nut in the central axis direction, and the screw thread portion. It is necessary to escape from the elongated portion in the direction of the central axis. And having a second assembly structure.

  The elbow joint of the present invention includes an elbow joint body, a nut that is screwed onto the elbow joint body, an outer diameter surface of a tube connected to the first end of the elbow joint body, and the nut And an outer diameter surface of the tube toward the first end of the elbow joint body. The sleeve is interposed between the inner diameter surface of the elbow and is rotatably fitted to the inner diameter surface of the nut. A sleeve for pressing so as to press, an extension part at the second end of the elbow joint body, and a male thread part fitted to the outer periphery of the extension part so as to be rotatable with respect to the central axis of the extension part And a second assembly structure that restricts the sleeve from escaping from the nut in the direction of the central axis, and a second assembly structure that restricts the male thread portion from escaping from the extension in the direction of the central axis. It has an assembly structure.

In addition to the above features, the elbow joint of the present invention has the following points.
An inner diameter of the first end portion of the elbow joint main body is substantially equal to an inner diameter of the tube to be connected.

  The second assembly structure is a male screw stop ring fitted in a groove formed in a wall surface that slides in the central axis direction.

  The flow path formed in the elbow joint has a curved portion that bends so that the central axis and the circumferential surface thereof are substantially along the flow line of the fluid flowing inside.

  The cross-sectional area of the flow path is constant between the first and second end portions.

  The cross-sectional area of the flow path is configured to gradually increase or decrease between the first and second end portions.

  The angular position formed by the first and second ends of the elbow joint is substantially perpendicular.

  The angular position formed by the first and second ends of the elbow joint is an obtuse angle.

  According to the present invention, the product life is long, the pressure loss in the flow path is small, the angular position of the sleeve and the nut can be freely set in the mounted state, and the manufacturing is simple, from the viewpoint of manufacturing cost. Can provide an economical and advantageous elbow joint.

Sectional drawing of Example 1 of the elbow joint which concerns on this invention is shown. Sectional drawing of Example 2 of the elbow joint which concerns on this invention is shown. A sectional view of a conventional elbow joint is shown. The partial cross section figure of the welding part of the elbow joint of a conventional product is shown.

[Example 1]
Examples of the present invention will be described below.
FIG. 1 shows a cross-sectional view of Example 1 of an elbow joint according to the present invention.

  The main body 1 of the elbow joint is formed of a metal or a resin material, and channels 11 and 12 that penetrate the entire length are provided in the inner diameter portion. The main body 1 of the elbow joint has a bent shape along the length direction from one end side to the other end side, and has a circular cross section at least at one end side and the other end side.

  A tube (not shown) having a nut 2, a sleeve 3, and a stop ring 4 is connected to a first end 11 on one end side of the main body 1, and a second end portion 12 of the extension portion 7 on the other end side. Is provided with a male screw part 6 and a female screw stop ring 5, and is fixed by screwing a male screw 6 'formed on the male screw part 6 into a connection part of the target device or the like.

  The nut 2 is formed of the same material as that of the elbow joint body 1 and is attached to a screw portion formed on the step portion of the body 1. The outer diameter surface of the nut 2 is a hexagonal nut-like or Surface width shape. The inner diameter surface of the nut 2 includes a threaded portion that engages with the threaded portion of the joint body 1, a fitting portion that fits the sleeve 3, a convex portion that restricts the sleeve 3 from escaping from the nut 2, and a tube. It is formed of four stages including an insertion portion that becomes an insertion opening.

  The sleeve 3 is ring-shaped, and the outer diameter portion thereof is configured in two stages. The first fitting portion that is rotatably fitted to the fitting portion of the nut 2 and the inner diameter of the convex portion of the nut 2 And a second fitting portion that is smaller in diameter than the first fitting portion, and a groove is formed in a ring shape over the entire circumference at a position outside the surface of the second fitting portion, Stop ring 4 is fitted here. In this way, the movement of the sleeve 3 in the central axis direction is restricted by the convex portion of the nut 2 and the stop ring 4 in the ring-shaped groove formed in the second fitting portion of the sleeve 3.

  Insert a nut 2 and sleeve 3 assembled with a stop ring 4 into a tube (not shown) in advance, and insert the tube end inner diameter into the first end 11 of the main body 1 by expanding it. Attach the threaded part by screwing it into the threaded part of the joint body 1. The outer diameter of the tube is pressed by the fitting part and the convex part of the nut 2 through the sleeve 3, and the inner diameter of the tube bites into the ring-shaped protrusion at the first end of the joint body 1, so that the tube is firmly held. Is done.

  Here, since the inner diameter of the first end of the joint body 1 is formed substantially equal to the inner diameter of the tube to be connected, the influence of pressure loss and the like on the fluid flowing through the flow path is reduced to the minimum. Can be made.

  The main body 1 of the elbow joint includes an extension portion 7 on the second end side, and a male screw portion 6 is rotatably fitted to the outer periphery of the extension portion 7. A groove is formed in a ring shape over the entire circumference on the main body 1 side of the inner peripheral surface of the male screw part 6, and a male screw stop ring 5 is fitted therein, and the male screw part 6 escapes from the elongated part 7 in the axial direction. It is regulated.

  A screw 6 ′ is formed on the outer periphery of the screw 6 and by screwing the screw 6 ′ of the screw 6 into the connection of the target device, the screw 6 is firmly attached to the connection of the target device. Fixed. However, since the elongated portion 7 of the elbow joint body 1 can be rotated in the circumferential direction with respect to the male threaded portion 6, it is possible to proceed with the fixing work without rotating the elbow joint body 1. In addition, by tightening the screw 6 on the fixed side device, the screw stop ring 5 housed in a groove provided on the inner surface of the screw 6 is connected to the outer periphery of the extension 7 of the elbow fitting body 1. The elbow joint body 1 is fixed in the axial direction of the extension part 7 when the tightening of the male thread part 6 is completed. It is possible to rotate around that axis. Therefore, the circumferential position of the tube connected to the first end can be freely changed.

  Even when the elbow joint of Example 1 is removed from the state where it is screwed into the connection part of the target device etc., it is possible to remove it by rotating only the male threaded part 6 without rotating the main body 1 of the elbow joint. Therefore, it is not necessary to remove the tube (not shown) from the main body 1 of the elbow joint, and the removal operation can be easily and efficiently performed.

  In addition, the flow path formed from the first end 11 to the second end 12 in the main body 1 of the elbow joint has a curved portion whose central axis and peripheral surface bend along the flow line of the fluid flowing inside. 10 is provided, the flow path resistance given to the flow in the flow path can be kept relatively low.

  Furthermore, the main body 1 and the elongated portion 7 of the elbow joint can be integrally formed by forging, molding, or cutting according to the material, so that the welding operation that is essential in the conventional product can be omitted. Therefore, it is completely free from events such as leakage due to aging that occurred with the presence of the welded portion, level difference at the joint, and occurrence of corrosion.

  Accordingly, it is possible to extend the product life of the elbow joint and to suppress various adverse effects on the fluid flowing inside, for example, mixing of corroded pieces, a decrease in pressure loss, and the like.

  In the first embodiment of the present invention, as shown in FIG. 1, the flow direction is bent substantially perpendicularly from the first end 11 to the second end 12 of the elbow joint. The present invention can also be applied to an obtuse angled shape larger than a right angle and an acute angled shape smaller than a right angle.

[Example 2]
FIG. 2 shows a cross-sectional view of Embodiment 2 of the elbow joint according to the present invention.
The second embodiment is configured such that the cross-sectional area of the first end portion 11 of the elbow joint is larger than the cross-sectional area of the second end portion 12, and the curved portion 10 is compared with the first embodiment. Thus, it is configured to have a larger radius of curvature.

  In the second embodiment, when the elbow joint flows from the first end 11 to the second end 12, the fluid is squeezed to increase the flow velocity, and conversely, from the second end 12 to the first end 11. When flowing into the fluid, the fluid diffuses and the flow velocity becomes slow. In any case, the curved portion 10 having a large radius of curvature turns the flow gently, so that the pressure loss of the fluid passing through the elbow joint can be suppressed.

  In the first and second embodiments described above, the bending angle between the first and second end portions of the elbow joint is shown to be a right angle, but the present invention is not limited to a right angle, and other than a right angle. In particular, an obtuse elbow joint may be desirable in relation to the intended use.

  The present invention is not limited to elbow joints for flowing paint for coating, and can be widely used for elbow joints for flowing fluid substances such as various liquids, gases, and powders.

1 Elbow fitting body
2 Nut
3 sleeve
4 Stop ring
5 Male thread stop ring
6 Male thread
6 'male screw
7 Elbow fitting body extension
8 Welded part
9 Joint
10 pieces
11 First end
12 Second end

Claims (10)

Elbow fitting body,
A first end of the elbow joint body having an inner diameter substantially equal to an inner diameter of a tube connected to the elbow joint body;
The second end of the elbow joint body includes an extension,
The flow path from the first end of the elbow joint body to the outer end of the elongated portion has no step, unevenness, or corners inside the flow path, while minimizing flow resistance given to the fluid. And an elbow joint configured to change the direction of the fluid. Elbow fitting body,
A nut that is screwed into the elbow joint body and attached;
A sleeve interposed between the outer diameter surface of the tube connected to the first end of the elbow joint body and the inner diameter surface of the nut;
A first end of the elbow joint body having an inner diameter substantially equal to an inner diameter of a tube connected to the elbow joint body, the second end of the elbow joint body including an extension,
A male threaded portion that is rotatably fitted to the central axis of the elongated portion on the outer periphery of the elongated portion,
A fixing structure for fixing the connection end of the tube to the first end of the elbow joint body;
A first assembly structure for restricting the sleeve from escaping from the nut in the central axis direction;
An elbow joint characterized by having a second assembly structure for restricting the male thread portion from escaping from the elongated portion in the central axis direction. Elbow fitting body,
A nut that is screwed into the elbow joint body and attached;
A sleeve interposed between the outer diameter surface of the tube connected to the first end of the elbow joint body and the inner diameter surface of the nut, and is rotatably fitted to the inner diameter surface of the nut. And a sleeve that holds the outer diameter surface of the tube so as to press between the first end of the elbow joint body,
The second end of the elbow joint body includes an extension,
A male threaded portion that is rotatably fitted to the central axis of the elongated portion on the outer periphery of the elongated portion,
A first assembly structure for restricting the sleeve from escaping from the nut in the central axis direction;
An elbow joint characterized by having a second assembly structure for restricting the male thread portion from escaping from the elongated portion in the central axis direction.   4. The elbow joint according to claim 3, wherein an inner diameter of the first end portion of the elbow joint body and an inner diameter of the tube to be connected are substantially equal.   5. The elbow joint according to claim 2, wherein the second assembly structure is a male screw stop ring fitted in a groove formed in an inner wall surface of the male screw part that slides. An elbow joint characterized by   The elbow joint according to any one of claims 1 to 5, wherein the flow path formed in the elbow joint main body substantially follows the streamline of the fluid flowing through the center axis and the inner peripheral surface thereof. An elbow joint characterized by having a curved part that bends like this.   The elbow joint according to claim 6, wherein a cross-sectional area of the flow path is constant between the first and second end portions.   The elbow joint according to claim 6, wherein a cross-sectional area of the flow path has a shape that gradually increases or decreases between the first and second end portions. Fittings.   The elbow joint according to any one of claims 1 to 8, wherein a bending angle between the first and second ends of the elbow joint is substantially a right angle. .   The elbow joint according to any one of claims 1 to 8, wherein an angle of bending between the first and second end portions of the elbow joint is an obtuse angle.

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