JP2015025476A - Pipe joint structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a pipe joint structure capable of reliably holding a jointing state with a small number of components and with a simple structure.SOLUTION: An annular groove 11 is formed on an outer periphery of a first pipe joint 1, and an engaging groove 12 including a component extending in an axial direction is formed. A pair of long holes 21 vertical to a shaft are opposed to each other in a radial direction on an outer periphery of a second pipe joint. By a clip comprising a spring member having a U-shaped part 30, and an engaging part 32 including a component extending in a direction orthogonal to a face including the U-shaped part from at least one of a pair of straight parts 31, while the first pipe joint is fitted with the second pipe joint, the straight parts are respectively fitted with the annular groove via the pair of long holes, and the engaging part is fitted with the engaging groove. While the engaging part is held between an inner periphery of the second pipe joint and a bottom face of the engaging groove, both pipe joints are jointed to each other.

Description

  The present invention relates to a pipe joint structure, and particularly relates to a pipe joint structure suitable for application to fluid equipment.

  In general, fluid equipment supplies and discharges fluid through a tube, and the fluid equipment and the tube, and the tube and another tube are joined in a liquid-tight or air-tight manner by a fitting. . As an example of such a pipe joint, the following Patent Document 1 states that “It can be easily attached and detached without the need to use a tool such as a spanner for the fluid pressure device, and thus when attaching to the fluid pressure device, The purpose of the present invention is to provide a pipe joint in which the work process is simplified, and “a substantially cylindrical socket disposed in a fluid pressure device and a fluid flow path, and a seal member interposed in the socket. A substantially cylindrical stud that is fitted and mounted in an airtight manner, a joint body that is fitted and fixed in an airtight manner to one end of a flow path of the stud via a seal member, and a clip that holds the stud in a state of being retained in a socket. The socket is provided with a clip receiving groove that allows the pair of clips to be elastically accommodated in the cylinder at a position opposed to the outer peripheral surface, and the stud is paired with the clip when fitted into the socket. Piece A tapered surface that is elastically deformed in the opening direction is provided, and the clip is inserted into a position adjacent to the expanded side end of the tapered surface and corresponding to the clip receiving groove in the socket to prevent the stud from being pulled out. The clip is provided with a retaining groove portion, and the clip is provided with a pair of paired pieces provided with an elastic clamping force for fitting into the retaining groove portion of the stat through the clip receiving groove of the socket. There has been proposed a pipe joint provided with an operating portion that allows the space between the pieces to expand (described in paragraphs [0003] and [0004] of Patent Document 1).

  In addition, although it is a field different from Patent Document 1, the following Patent Document 2 relates to “Inlet pipe joint structure of fuel tank” and “Connects an inlet pipe and forms a flange on the outer periphery of the intermediate part of the connection pipe. A pair of elongated holes perpendicular to the axis is formed in the joint portion of the inlet pipe located between the flange portion of the connection pipe and the fuel tank body when joined to the pipe so as to be opposed to each other in the radial direction. A structure is proposed in which a sealing member is interposed between the outer surface of the inlet pipe and the inner surface of the inlet pipe, and a clip is fitted into a pair of elongated holes to join the inlet pipe to the connecting pipe (see paragraph [ 0017]), the clip is made up of a spring member that is wound in an annular shape so that both ends intersect each other and has an urging force in the direction of diameter reduction. If it is formed so that its diameter increases when pressed in the direction, hold the clip with both ends pressed before fitting the inlet pipe to the connecting pipe, and fit the clip into the pair of elongated holes. "When pressed, the pressed state of both ends is released" (Patent Document 2, paragraph [0018]).

JP 2001-12664 A Japanese Patent No. 4566433

  In the pipe joint structures in Patent Documents 1 and 2, clips are used. However, since it is assumed that both are detachable, basically, the connection state is set so as to be released. ing. Accordingly, it is necessary to take another measure as a means for maintaining the joined state even if some external force is applied to the clip after joining. For example, a non-rotating member is added to the clip described in Patent Document 1, and a member that holds both ends in an expanded state is added to the clip described in Patent Document 2 to maintain the joined state. Since it is necessary, the number of parts increases, and there is a possibility that a new problem such as difficulty in assembling may be caused.

  Then, this invention makes it a subject to provide the pipe joint structure which has few parts and can hold | maintain a joining state reliably with a simple structure.

  In order to achieve the above object, the present invention provides a part of a first pipe joint made of a cylindrical member attached to a joining target in a second pipe joint made of a cylindrical member attached to the joined object. In a pipe joint structure in which both pipe joints are locked with clips in a fitted state, an annular groove is formed on the outer peripheral surface of the tubular member constituting the first pipe joint, and the tubular shape is formed from the annular groove. A pair of oblong holes perpendicular to the axis of the cylindrical member is formed on the outer peripheral surface of the cylindrical member forming the second pipe joint by forming a locking groove including a component extending in the axial direction of the member. And the clip has a U-shaped portion, and the U-shape is formed from at least one of a pair of linear portions constituting the U-shaped portion. A spring member having a locking portion including a component extending in a direction orthogonal to the surface including the portion, In the state where the first pipe joint is fitted in the second pipe joint, the straight portions of the clips are fitted into the annular grooves through the pair of elongated holes, respectively, and the locking portion In the state where the locking portion is held between the inner peripheral surface of the tubular member constituting the second pipe joint and the bottom surface of the locking groove. 1 pipe joint and the said 2nd pipe joint are comprised so that it may join.

  In the above-described pipe joint structure, the clip has the locking portion extending so as to expand from the straight portion toward the connecting portion, and the locking portion is locked in the locking groove. The distance between the connection part of the U-shaped part and the second pipe joint in a state where the locking part is locked from the state where the locking part is locked in the locking groove is It is preferable that the connecting portion is set to be smaller than the movable distance of the linear portion in the direction in which the connecting portion is close to the locking groove until it is detached from the groove. Further, the clip may be formed so as to intersect both tip portions of the U-shaped portion, and a grip portion may be formed at each of the tip portions.

  Further, in the pipe joint structure described above, the outer peripheral surface of the cylindrical member constituting the first pipe joint and the inner peripheral surface of the cylindrical member constituting the second pipe joint are respectively compressed toward the distal end direction. It is good to comprise so that it may have a taper surface diameter and may be joined in the state which both taper surfaces contacted when the 1st pipe joint was fitted in the 2nd pipe joint.

  In the above-described pipe joint structure, each of the joining target and the joined target can be either a fluid device that supplies or discharges fluid and a tube that is joined to the fluid device. It can be used for a gas pump for supplying and discharging gas.

  Since this invention is comprised as mentioned above, there exist the following effects. That is, in the pipe joint structure of the present invention, an annular groove is formed on the outer peripheral surface of the cylindrical member constituting the first pipe joint, and a component extending from the annular groove in the axial direction of the cylindrical member is provided. A pair of long holes perpendicular to the axis of the cylindrical member are opposed to each other in the radial direction of the cylindrical member on the outer peripheral surface of the cylindrical member constituting the second pipe joint. The clip has a U-shaped portion and extends from at least one of a pair of linear portions constituting the U-shaped portion in a direction orthogonal to the surface including the U-shaped portion. It consists of a spring member having a latching portion containing the component to be ejected, and in a state where the first pipe joint is fitted in the second pipe joint, the straight portions of the clips are respectively formed into annular grooves through a pair of elongated holes. The engaging portion is engaged with the engaging groove, and the inner peripheral surface of the cylindrical member constituting the second pipe joint and the bottom of the engaging groove The first pipe joint and the second pipe joint are joined together in a state where the locking portion is held between the first pipe joint and the second pipe joint with a simple structure. The joined state of the pipe joint can be reliably maintained. In particular, the clip can be mounted by a simple operation of fitting the linear portion of the clip into the annular groove via a pair of elongated holes and fitting the locking portion into the locking groove, respectively. Since the locking portion is held between the inner peripheral surface of the tubular member constituting the pipe joint and the bottom surface of the locking groove, even if an external force is applied to the clip in any direction, Even when an external force is applied in the direction in which the clip is detached, the clip can be reliably prevented from falling off.

  In the above-described pipe joint structure, the clip has a U-shaped portion in a state in which the locking portion extends and is extended from the straight portion toward the connecting portion, and the locking portion is locked in the locking groove. The distance between the connecting portion and the second pipe joint is such that the connecting portion becomes the locking groove from the state where the locking portion is locked to the locking groove until the locking portion is detached from the locking groove. If the configuration is set to be smaller than the movable distance of the linear portion in the approaching direction, not only can the clip be easily attached, but also the direction in which the connecting portion approaches the locking groove with respect to the clip, that is, Even when a large external force is applied in the mounting direction of the clip, the joined state can be reliably maintained without dropping the clip. Furthermore, if the clip is formed so as to intersect both tip portions of the U-shaped portion, and a grip portion is formed at each of both tip portions, the clip can be easily attached, In contrast, even when an external force is applied in the direction in which the clip is detached, the clip can be reliably prevented from falling off.

  Furthermore, in the above pipe joint structure, the outer peripheral surface of the cylindrical member constituting the first pipe joint and the inner peripheral surface of the cylindrical member constituting the second pipe joint are each reduced in diameter toward the distal direction. If the first pipe joint is fitted in the second pipe joint and the two taper faces are joined together, the first pipe joint is formed. And the second pipe joint can be maintained in an appropriate joined state.

  In addition, since the joining object and the object to be joined can be either one of a fluid device that supplies and discharges fluid and a tube that is joined to the fluid device, respectively, meet various demands and provide a wide range of applications. Can do. For example, since it can be applied to a gas pump that supplies and discharges gas as a fluid device, it can be used for an air suspension device of an automobile.

It is a perspective view which shows each component before the assembly | attachment in the pipe joint structure which concerns on one Embodiment of this invention. It is a perspective view which shows the joining state in the pipe joint structure which concerns on one Embodiment of this invention. It is a perspective view which shows the latching state of the clip with respect to a 1st pipe joint in the pipe joint structure which concerns on one Embodiment of this invention. It is sectional drawing which shows the joining state in the pipe joint structure which concerns on one Embodiment of this invention, Comprising: It is sectional drawing of the AA cross section of FIG. It is sectional drawing which shows the joining state in the pipe joint structure which concerns on one Embodiment of this invention, Comprising: It is sectional drawing of the BB line cross section of FIG. It is a perspective view which shows another aspect of the 1st pipe joint which can be used for the pipe joint structure which concerns on one Embodiment of this invention. It is a perspective view which shows a part of gas pump to which the pipe joint structure provided for one Embodiment of this invention is applied. It is a front view which shows a part of air suspension apparatus provided with the gas pump to which the pipe joint structure provided for one Embodiment of this invention is applied.

  Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings. FIGS. 1 to 5 show a pipe joint structure according to an embodiment of the present invention. For example, as a fluid device for supplying and discharging fluid, a gas pump P (see FIG. 7) for an automobile air suspension apparatus shown in FIG. (Shown in a perspective view) and a tube T joined to the tube T and between the tube T and another tube (not shown), but may be used for joining a plurality of fluid devices. Is possible. In the present embodiment, a second pipe joint 2 made of a cylindrical member attached to a gas pump P to be joined is partially attached to a tubular member 1 made of a cylindrical member attached to a tube T to be joined. Both pipe joints 1 and 2 are configured to be locked by the clip 3 in a state of being fitted inside.

  As shown in FIG. 1, the first pipe joint 1 has an annular groove 11 formed on the outer peripheral surface of the synthetic resin tubular member 10 constituting the first pipe joint 1, and the shaft of the tubular member 10 is formed from the annular groove 11. A locking groove 12 including a component extending in the direction is formed. In the present embodiment, the locking groove 12 opens so as to be a right triangle on the outer peripheral surface of the tubular member 10, its long side portion opens into the annular groove 11, and its short side portion is the above-described tubular member 10. This corresponds to a component extending in the axial direction. On the other hand, the second pipe joint 2 has a pair of long holes 21 and 21 perpendicular to the axis of the cylindrical member 20 on the outer peripheral surface of the synthetic resin cylindrical member 20 constituting the second pipe joint 2 (only one is shown in FIG. 1). Are formed so as to face each other in the radial direction of the cylindrical member 20. The outer peripheral surface of the cylindrical member 10 constituting the first pipe joint 1 and the inner peripheral surface of the cylindrical member 20 constituting the second pipe joint 2 are respectively tapered surfaces 10s whose diameters are reduced in the distal direction. 20s (the inner peripheral surface is not shown in FIG. 1 (20s)), and when the first pipe joint 1 is fitted into the second pipe joint 2, both tapered surfaces 10s, Bonding is performed in a state where 20s is in contact (shown in FIG. 4). As a result, the first pipe joint 1 and the second pipe joint 2 can be maintained in an appropriate joined state.

  The clip 3 is formed of a spring member, and has a U-shaped portion 30 as shown in FIG. 1 and at least one of a pair of linear portions 31 and 31 constituting the U-shaped portion 30 (one in this embodiment). It has the latching | locking part 32 containing the component extended in the direction orthogonal to the surface containing the U-shaped part 30 from the straight part 31 only. The locking portion 32 of the present embodiment is in the shape of a protrusion cut and raised so as to expand from the substantially central portion of the straight portion 31 in the direction of the connecting portion 33 (that is, in the direction opposite to the insertion direction of the clip 3). A component that is formed and that is orthogonal to the surface including both straight portions 31 and 31 of the protruding locking portion 32 extends in a direction orthogonal to the surface including the U-shaped portion 30. Corresponds to the ingredients.

  In addition, the clip 3 of the present embodiment is formed so that both tip portions 34, 34 of the U-shaped portion 30 intersect, and gripping portions 35, 35 are bent at both the tip portions 34, 34, respectively. . Further, as shown in FIGS. 4 and 5, the distance between the connecting portion 33 of the U-shaped portion 30 and the second pipe joint 2 in a state where the locking portion 32 is locked in the locking groove 12 ( 5), the connecting portion 33 is close to the locking groove 12 until the locking portion 32 is detached from the locking groove 12 after the locking portion 32 is locked in the locking groove 12. It is set to be smaller than the movable distance (indicated by D in FIG. 5) of the straight line portion 31 in the direction in which it moves.

  Thus, as shown in FIG. 1, the grips 35, 35 of the clip 3 are pinched from both sides and the clip 3 is expanded and disposed outside the second pipe joint 2, so that the first pipe joint 1 is After fitting into the second pipe joint 2, the straight portions 31, 31 of the clip 3 are fitted into the annular groove 11 through the pair of long holes 21, 21, respectively, and the clip 3 is moved in the direction of the white arrow. If it presses and the latching | locking part 32 is fitted to the latching groove | channel 12, the 1st pipe joint 1 and the 2nd pipe joint 2 will be in the joining state shown in FIG. When the engaging portion 32 is fitted into the engaging groove 12, the protruding engaging portion 32 is easily inserted into the annular groove 11 while being bent in the direction of the linear portion 31. Once accommodated in the locking groove 12, the elastic force returns to the shape shown in FIG. 1, and the fitting state shown in FIGS. 3 to 5 is maintained.

  As a result, the first pipe joint 1 and the second pipe joint 2 can maintain the joined state shown in FIG. That is, since the straight portions 31 and 31 of the clip 3 are fitted into the annular groove 11 through the pair of long holes 21 and 21, respectively, the first pipe joint 1 is connected to the clip 3 with the second pipe joint 2. Even when an external force in the axial direction (x direction in FIG. 3) to be detached from is applied, the joint state between the two is reliably held by the clip 3. Further, even when an external force is applied to the clip 3 in a direction perpendicular to the axes of the first and second pipe joints 1 and 2 (y direction in FIG. 3), the U-shaped portion 30 in the locking portion 32 is included. The component extending in the direction orthogonal to the surface and the component extending in the axial direction of the cylindrical member 10 in the locking groove 12 can reliably prevent the clip 3 from falling off.

  Further, as apparent from FIGS. 3 and 4, the locking portion 32 of the clip 3 is held between the inner peripheral surface of the cylindrical member 20 constituting the second pipe joint 2 and the bottom surface of the locking groove 12. In this state, since the first pipe joint 1 and the second pipe joint 2 are joined, for example, after the clip 3 is mounted, the grip portions 35 and 35 are operated (gripped), and the clip 3 Even when an external force in a direction perpendicular to the axes of the first and second pipe joints 1 and 2 (z direction in FIG. 3), that is, an external force in a direction in which the locking portion 32 is detached from the locking groove 12 is applied. The clip 3 does not fall off.

  Further, as described above, since the distance (d) shown in FIG. 5 is set to be smaller than the movable distance (D), the direction in which the connecting portion 33 approaches the locking groove 12 with respect to the clip 3, that is, the clip Even when a large external force is applied in the mounting direction of the clip 3, the clip 3 is not dropped and the bonded state of the first pipe joint 1 and the second pipe joint 2 can be reliably maintained. When a large external force is applied to the clip 3 in the direction opposite to the above (the direction in which the connecting portion 33 is separated from the locking groove 12), the tip of the protruding locking portion 32 is the locking groove. Since the movement of the clip 3 is prevented by coming into contact with the side surface of the clip 12, the clip 3 will not fall off.

  Furthermore, since the gripping portions 35 and 35 are formed at both the tip portions of the clip 3, the clip 3 can be easily attached, and the clip 3 is detached from the gripping portions 35 and 35 by mistake after joining. Even when an external force is applied to the clip 3, it is possible to reliably prevent the clip 3 from falling off as described above. In addition, the holding parts 35 and 35 are abbreviate | omitted, the whole clip 3 is formed in a U shape, and the linear parts 31 and 31 are connected to the 1st pipe joint 1 via the long holes 21 and 21 of the 2nd pipe joint 2. In addition, the clip 3 is mounted so that the coupling portion 33 is pressed in the axial center direction of the first pipe joint 1 and the locking portion 32 is pushed into the locking groove 12. Good.

  FIG. 6 shows a state in which the clip 3 is locked with respect to another aspect of the first pipe joint 1, and the locking groove 12 shown in FIG. 3 is opened so as to form a right triangle on the outer peripheral surface of the cylindrical member 10. In contrast, a locking groove 12x having a rectangular recess is formed. That is, the locking groove 12x in this embodiment opens so as to be rectangular on the outer peripheral surface of the tubular member 10, its long side portion opens into the annular groove 11, and its short side portion is the above-described tubular member 10. This corresponds to a component extending in the axial direction. Since the other configuration is the same as that shown in FIG. 3, substantially the same parts are denoted by the same reference numerals, and description thereof is omitted. In addition, as the latching | locking part 32 of the clip 3, it is good also as compressing the linear part 31 from both sides | surfaces, and forming a standing wall of a right triangle, for example.

  The pipe joint structure having the above configuration can be applied to various fluid devices in addition to the gas pump P described above, and the joining target and the joining target are either the fluid device and a tube joined to the fluid device. Since it can be set to one side, it can respond to various requests and can be used for a wide range of applications.

DESCRIPTION OF SYMBOLS 1 1st pipe joint 2 2nd pipe joint 3 Clip 10 Cylindrical member 11 Annular groove 12 Locking groove 20 Cylindrical member 21 Long hole 10s, 20s Tapered surface 30 U-shaped part 31 Linear part 32 Locking part 33 Connecting part 34 Tip part 35 Gripping part P Gas pump T Tube

Claims (6)

  In a state where a part of the first pipe joint made of the cylindrical member attached to the object to be joined is fitted in the second pipe joint made of the cylindrical member attached to the object to be joined, both pipe joints are clipped. In the pipe joint structure to be latched, an annular groove is formed on the outer peripheral surface of the cylindrical member constituting the first pipe joint, and a member including a component extending from the annular groove in the axial direction of the cylindrical member. A pair of long holes perpendicular to the axis of the cylindrical member are opposed to each other in the radial direction of the cylindrical member on the outer peripheral surface of the cylindrical member constituting the second pipe joint. The clip has a U-shaped part and extends from at least one of a pair of straight lines constituting the U-shaped part in a direction orthogonal to the surface including the U-shaped part. A spring member having a latching portion containing a component to be ejected, wherein the first pipe joint is disposed in the second pipe joint. In the fitted state, the linear portion of the clip is fitted into the annular groove through the pair of elongated holes, and the locking portion is fitted into the locking groove, and the second tube The first pipe joint and the second pipe joint are joined in a state where the locking portion is held between the inner peripheral surface of the tubular member constituting the joint and the bottom surface of the locking groove. A pipe joint structure characterized by that.   The clip is formed with the locking portion extending so as to expand from the straight portion toward the connecting portion, and the U-shape in a state where the locking portion is locked in the locking groove. The distance between the connecting portion of the shaped portion and the second pipe joint is from the state where the locking portion is locked to the locking groove until the locking portion is detached from the locking groove. The pipe joint structure according to claim 1, wherein the connecting portion is set to be smaller than a movable distance of the linear portion in a direction approaching the locking groove.   The pipe joint structure according to claim 1 or 2, wherein the clip is formed so as to intersect both tip portions of the U-shaped portion, and a grip portion is formed at each of the both tip portions. .   The outer peripheral surface of the cylindrical member constituting the first pipe joint and the inner peripheral surface of the cylindrical member constituting the second pipe joint each have a tapered surface reduced in diameter toward the distal direction, 4. When the first pipe joint is fitted into the second pipe joint, the two pipe joints are joined in contact with each other. The pipe joint structure described.   The said joining object and the said to-be-joined object are either one of the fluid apparatus which supplies / discharges a fluid, and the tube joined to this fluid apparatus, respectively, The Claim 1 thru | or 4 characterized by the above-mentioned. Pipe joint structure.   6. The pipe joint structure according to claim 5, wherein the fluid device is a gas pump for supplying and discharging gas.

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