JP2013011336A - Tube joint - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a tube insertion port capable of coping with tubes having a plurality of different diameters.SOLUTION: First and second bamboo shoot-like parts 17, 18 are disposed on the outer circumferential surface of a tube insertion port 11, from the end part 11A side of the tube insertion port. The first bamboo shoot-like part 17 is made by forming first and second joint parts 21, 22 of a circular truncated cone shape continuously. The second bamboo shoot-like part 18 is made by forming third and fourth joint parts 23, 24 continuously. A plurality of protrusion parts 25, 26 on the first bamboo shoot-like part 17 have outer diameters R1 equal to each other. A plurality of protrusion parts 27, 28 on the second bamboo shoot-like part 18 have outer diameters R2 equal to each other and larger than the outer diameter in the protrusion parts 25, 26. The first bamboo shoot-like part 17 is connected to the second bamboo shoot-like part 18 discontinuously via a cylindrical small diameter part 33 having an outer diameter smaller than the outer diameter of the protrusion parts 25, 26.

Description

  The present invention relates to a tube joint provided in various devices such as an air instrumentation device and used by being inserted into a tube.

  2. Description of the Related Art Conventionally, tube joints that are used by being inserted into a tube are known in which annular joints are provided in multiple stages on the outer peripheral surface of the insertion port, and the insertion port is formed in a so-called bamboo shoot shape. In the bamboo shoot-like insertion port, each node is locked to the inner peripheral surface of the tube, thereby preventing the tube from falling out of the insertion port (see, for example, Patent Documents 1 and 2). Further, in order to facilitate insertion into a tube, there is also known a tapered insertion port whose outer diameter decreases toward the tip.

JP 2004-360743 A Japanese Patent Laid-Open No. 9-296893

  By the way, depending on the device provided with the tube joint, a tube having a different diameter may be connected to the tube insertion port. For example, in an air instrumentation device, a different type of manometer is used depending on the application, but the tube diameter of the manometer may vary depending on the type.

  However, in order to connect a bamboo shoot-shaped insertion port without falling off, it can only accommodate a single diameter tube and needs to be replaced whenever the diameter of the tube to be connected changes. May get worse. On the other hand, when the insertion port is tapered, it can be connected to tubes having different diameters, but there is a drawback in that the connected tube is easy to come out from the insertion port.

  Then, an object of this invention is to provide the tube coupling which can respond to a some tube diameter, and the tube attached to the insertion port cannot pull out easily.

  The tube joint according to the present invention has at least one convex portion on the outer peripheral surface of the tube insertion port, and the first and second locking portions for locking the externally fitted tube are tube differences. The outer diameter of the convex part in the second locking part is larger than the outer diameter of the convex part in the first locking part. The first and second locking parts are The first locking portion is arranged so as to be separated from each other through a small diameter portion of a cylinder whose outer diameter is smaller than the outer diameter of the convex portion of the first locking portion.

  In addition, each of the first and second engaging portions is preferably configured by arranging a plurality of convex portions in the axial direction. Further, it is more preferable that the outer diameters of the plurality of convex portions in the first locking portion are the same as each other, and the outer diameters of the plurality of convex portions in the second locking portion are the same.

  For example, each of the first and second engaging portions includes a continuous node portion having a relatively small diameter on the end side and a relatively large diameter on the opposite side. The said node part expands toward the opposite side from the said edge part side along an axial direction, Comprising: For example, it is a cylindrical truncated cone. The first locking portion is for attaching a tube having a relatively small inner diameter, and the second locking portion is for attaching a tube having a relatively large inner diameter.

  Moreover, the tube coupling which concerns on this invention is comprised by the outer peripheral surface of a tube insertion port, and each convex part is arranged in multiple numbers by the axial direction, and it is the 1st and 2nd for latching the tube fitted outside The locking portion is provided from the end side of the tube insertion port, and the outer diameters of the plurality of convex portions in the first locking portion are the same as each other, and the plurality of convex portions in the second locking portion are The outer diameters may be the same as each other, and may be characterized by being larger than the outer diameter of the convex portion in the first locking portion.

  According to the present invention, it is possible to provide a tube joint that can be used for a plurality of types of tubes having different outer diameters, and in which attached tubes are difficult to come off.

It is a perspective view which shows the tube coupling which concerns on one Embodiment of this invention. It is sectional drawing which shows the tube coupling to which the tube of relatively small diameter was connected. It is sectional drawing which shows the tube coupling to which the relatively large diameter tube was connected.

  Hereinafter, the present invention will be described in more detail with reference to the drawings. FIG. 1 is a perspective view showing a tube joint according to an embodiment of the present invention. 2 and 3 are cross-sectional views showing the tube joint when the tubes are connected.

  As shown in FIG. 1, the tube joint 10 has a tubular shape, and is provided with a tube insertion port 11 to be inserted into a tube, which will be described later, at one end, and a connection port 12 to be connected to another tube or a flow path at the other end. . The tube joint 10 is provided with an attachment portion 13 made of a male screw in the middle of the tube joint 10. As for the attachment part 13, the hexagonal screw head 14 is arrange | positioned at the tube insertion port 11 side, and the axial part 15 which has a thread groove in an outer peripheral surface is arrange | positioned at the connection port 12 side. The tube joint 10 can be attached to another member by the attachment portion 13. The tube joint 10 is made of, for example, metal, hard resin, or the like.

  On the outer peripheral surface of the tube insertion port 11, concave and convex first and second bamboo shoot parts 17 and 18 are provided in this order from the end 11 </ b> A side of the insertion port 11. As will be described later, the first and second bamboo child portions 17 and 18 are locking portions for locking the externally fitted tubes. The first bamboo shoot portion 17 includes first and second node portions 21 and 22 that are continuous in the axial direction of the tube joint 10. The first and second node portions 21 and 22 are cylindrical truncated cones having a small diameter on the end 11A side and a large diameter on the opposite side. The first node 21 has a bottom surface on the large diameter side connected to a bottom surface on the small diameter side of the second node 22. Similarly to the first bamboo shoot part 17, the second bamboo shoot part 18 includes third and fourth node parts 23 and 24 which are cylindrical truncated cones.

  The first bamboo shoot part 17 is discontinuously connected to the second bamboo shoot part 18 via a first small diameter part 33 formed of a cylinder. That is, the first and second bamboo shoot parts 17, 18 are arranged apart from each other in the axial direction via the small diameter part 33. The 2nd bamboo shoot part 18 is connected to the screw head 14 via the 2nd small diameter part 34 comprised from a cylinder.

  As shown in FIG. 2, the first and second node portions 21 and 22 have large-diameter end portions that are annular convex portions 25 and 26, whereby the first bamboo shoot portion 17 has a convex portion. A plurality are arranged in the axial direction. Moreover, the connection part of the node parts 21 and 22 becomes a cyclic | annular recessed part. The first and second node portions 21 and 22 have the same shape, and the end portions on the large diameter side (that is, the convex portions 25 and 26) have the same outer diameter R1.

  Similarly, the third and fourth node portions 23 and 24 have end portions on the large-diameter side as annular convex portions 27 and 28, and a plurality of convex portions are arranged in the second bamboo shoot portion 18 in the axial direction. . Moreover, the connection part of the node parts 23 and 24 becomes an annular recessed part. The third and fourth node portions 23 and 24 have the same shape, and the convex portions 27 and 28 have the same outer diameter R2. The outer diameter R2 is larger than the outer diameter R1 of the convex portions 25 and 26, and accordingly, the tube insertion port 11 is provided with first and second bamboo child portions 17 and 18 having different outer diameters. Become.

  The outer diameters of the end portions on the small diameter side of the third and fourth node portions 23, 24 are at least larger than the outer diameters of the end portions on the small diameter side of the first and second node portions 21, 22. The outer diameter R1 of the convex portions 25 and 26 is approximately the same size.

  The first small-diameter portion 33 between the first and second bamboo shoot portions 17 and 18 is the end portion on the large-diameter side of the second node portion 22 (that is, the convex portion 26) or the third node portion. An annular groove 35 having an outer diameter smaller than that of the end portion on the small diameter side of 23 and recessed from the second and third node portions 22 and 23 is formed. In the annular groove 35, the end surfaces in the axial direction of the bamboo shoot parts 17 and 18 (that is, the bottom surface on the large diameter side of the second node 22 and the bottom surface on the small diameter side of the third node 23) are groove side surfaces 35A, 35B. These groove side surfaces 35A and 35B are perpendicular to the axial direction.

  The second small diameter portion 34 has an outer diameter smaller than the outer diameter R <b> 2 and forms an annular groove 36 between the fourth node portion 24 and the screw head 14. In the annular groove 36, the bottom surface of the fourth node 24 on the large diameter side (that is, the end surface in the axial direction of the second bamboo shoot portion 18) and the top surface of the screw head 14 become the groove side surfaces 36A and 36B. . These groove side surfaces 36A and 36B are perpendicular to the axial direction.

  Tubes having different inner diameters can be connected to the tube insertion port 11 in the present embodiment. Specifically, as shown in FIG. 2, when a tube 41 having a relatively small inner diameter is attached to the tube insertion port 11, the tube 41 is fitted on the first bamboo shoot part 17. At this time, the distal end portion 41 </ b> A of the tube 41 is disposed inside the annular groove 35. And the vicinity part of 41 A of front-end | tip parts is latched by the convex parts 25 and 26, and, thereby, the fall of the tube 41 is prevented. The tube 41 has an inner diameter smaller than the outer diameter R1 of the convex portions 25 and 26 when no external force is applied.

  On the other hand, when the tube 42 having a relatively large inner diameter is attached to the tube insertion port 11, the tube 42 is externally fitted to the second bamboo element 18 as shown in FIG. 3. At this time, the distal end portion 42 </ b> A of the tube 42 is disposed inside the annular groove 36. And the vicinity part of 42 A of front-end | tip parts is latched by the convex parts 27 and 28, and drop-out of the tube 42 is prevented. The tube 42 has an inner diameter smaller than the outer diameter R2 of the convex portions 27 and 28 when an external force is not applied, but is larger than the outer diameter R1 of the convex portions 25 and 26 and is not locked to the convex portions 25 and 26. . The tubes 41 and 42 are made of, for example, rubber or synthetic resin and have flexibility.

  As described above, in the present embodiment, the tubes 41 and 42 having different inner diameters are appropriately fitted to the first and second bamboo shoot parts 17 and 18 having different outer diameters, so that the convex portions 25 to 28 are appropriately formed. Is prevented from falling off. Thereby, the tube insertion port 11 in this embodiment can respond to a plurality of types of tubes having different inner diameters.

  Moreover, since each bamboo shoot part 17 and 18 has two convex parts with the same outer diameter, the tube 41 and 42 attached to each bamboo shoot part 17 and 18 act on substantially the same pressing force from two convex parts. And is stably locked.

  Furthermore, the vicinity of the tip portions 41A, 42A of the tubes 41, 42 is pressed by the convex portions 25-28 and relatively large in diameter, while the tubes 41, 42 disposed in the annular grooves 35, 36 are disposed. The distal end portions 41A and 42A are not substantially expanded in diameter, or are relatively expanded in diameter. As described above, the tubes 41 and 42 attached to the insertion port 11 have the tip portions 41A and 42A having relatively small diameters. Therefore, even if a force is applied in the pulling direction, the first and second tubes 41 and 42 have a relatively small diameter. It is easy to be locked to the end surfaces (that is, the groove side surfaces 35A and 36A) of the bamboo shoot parts 17 and 18, and the falling off is more effectively prevented.

  Furthermore, the tubes 41 and 42 can be attached to the tube insertion port 11 with the tip portions 41A and 42A being abutted against the groove side surfaces 35B and 36B, so that the tube attachment position can be easily stabilized.

  The tip portions 41A and 42A of the tubes 41 and 42 may be fastened and fixed by hose bands (not shown) arranged on the outer peripheral side of the first or second small diameter portions 33 and 34, respectively. Thereby, the tubes 41 and 42 are more reliably attached to the tube insertion port 11. In addition, since the 1st and 2nd small diameter parts 33 and 34 are cylindrical shapes with a fixed outer diameter, a hose band is easy to attach.

  Furthermore, the node portions 21 to 24 in the present embodiment do not have to have a truncated cone shape as long as they constitute a convex portion that can lock the tubes 41 and 42. For example, it may have a shape in which a spherical body is cut so that the central portion in the axial direction has the largest diameter and both end portions in the axial direction have the smallest diameter, and the outer peripheral surface is spherical. good.

  Moreover, in this embodiment, although the latching | locking part for latching a tube was a bamboo shoot part which consists of two node parts continuously, even if there are three or more node parts in each bamboo shoot part, good. Moreover, the latching | locking part should just have one or more convex parts so that a tube can be latched, consists of only one node part, and does not need to comprise the bamboo shoot. Also, three or more bamboo shoot parts (locking parts) may be provided. In this case, the third bamboo shoot part (locking part) has a plurality of convex parts having an outer diameter larger than the outer diameter R 2, and is connected to the second bamboo shoot part via the small diameter part 34.

DESCRIPTION OF SYMBOLS 10 Tube coupling 11 Tube insertion port 17, 18 1st and 2nd bamboo shoot part (1st and 2nd latching | locking part)
21-24 First to fourth node portions 25-28 Convex portions 33, 34 First and second small diameter portions

Claims (6)

At least one convex portion is provided on the outer peripheral surface of the tube insertion port, and first and second locking portions for locking the externally fitted tube are provided from the end side of the tube insertion port. Provided,
The outer diameter of the convex portion in the second locking portion is larger than the outer diameter of the convex portion in the first locking portion,
The first and second locking portions are spaced apart from each other via a cylindrical small-diameter portion whose outer diameter is smaller than the outer diameter of the convex portion of the first locking portion. Tube fitting.   2. The tube joint according to claim 1, wherein each of the first and second locking portions includes a plurality of convex portions arranged in the axial direction.   The outer diameters of the plurality of convex portions in the first locking portion are the same as each other, and the outer diameters of the plurality of convex portions in the second locking portion are the same as each other. The tube joint according to claim 2.   Each of the first and second locking portions is constituted by a continuous node having a relatively small diameter on the end side and a relatively large diameter on the opposite side. The tube fitting described.   The first locking portion is for mounting a tube having a relatively small inner diameter, and the second locking portion is for mounting a tube having a relatively large inner diameter. The tube joint according to claim 1, wherein the tube joint is characterized in that: A plurality of convex portions are arranged in the axial direction on the outer peripheral surface of the tube insertion port, and the first and second locking portions for locking the externally fitted tube are the tube insertion port. Provided from the end side of the
The outer diameters of the plurality of convex portions in the first locking portion are the same as each other, and the outer diameters of the plurality of convex portions in the second locking portion are the same as each other, and the first A tube joint characterized by being larger than the outer diameter of the convex portion in one locking portion.

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