JP2019211054A - Union joint - Google Patents

Abstract

To provide a union joint which enables a union nut to be attached to a second pipe even after a union flange part is formed at the second pipe or after the second pipe is bent.SOLUTION: A union joint 10 connecting a first pipe P1 with a second pipe P2 comprises: a union screw 11 provided at the first pipe P1; a union flange part 12 provided at the second pipe P2; and a union nut 13 rotatably provided at the second pipe P2. The union nut 13 has a slit part 22 which opens from one end part to the other end part in an axial direction and has a substantially C shape when viewed in the axial direction.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a union joint that connects two pipes used for piping of a refrigeration cycle constituting a vehicle air conditioner, for example.

  The piping of the refrigeration cycle described above is configured by connecting two or more pipes, and two adjacent pipes are connected using a union joint.

  Conventionally, as a union joint, a union screw attached to an end portion of a first pipe, a diameter is radially outward at a certain distance from an opening of the second pipe connected to the first pipe. A union collar portion, which is provided to expand toward the front, and a union nut which is rotatably provided on the second pipe and is screwed with a union screw to connect the first pipe and the second pipe. (See Patent Document 1). The portion on the opening side from the union collar portion of the second tube is an insertion portion to be inserted into the first tube.

  The union nut used in the union joint described in Patent Document 1 is provided with a locking portion that engages with the union collar portion of the second pipe at the end in the axial direction to prevent the union, and penetrates in the center of the locking portion. Shaped hole.

  The hole of the union nut has a diameter substantially equal to the outer diameter of the portion opposite to the insertion portion via the union collar portion of the second pipe. And the union nut is inserted in the part on the opposite side to an insertion part via the union collar part in a 2nd pipe | tube so that movement is possible.

  The union collar part formed in the 2nd pipe | tube engages with the latching | locking part of a union nut, and has prevented that the union nut came off from the 2nd pipe | tube.

  The piping of the refrigeration cycle may be bent and arranged in a narrow space. In this case, the second pipe is bent so as to crevice between the parts other than the union joint.

  To attach a union nut used for a conventional union joint to the second pipe, after inserting the second pipe into the union nut, the end of the second pipe is processed and bent into the second pipe. Since the order of applying the process is forcibly determined, the processing efficiency is not good.

  And in the conventional union joint, at the time of the bending process of a 2nd pipe | tube, it is necessary to approach to the edge part on the opposite side to a process side previously so that a process may not be disturbed. If you forget to put the union nut, it will lead to failure of the processing equipment and mold, which will be a problem. In addition, when bending the second pipe, the union nut may be fixed with a separate part so as not to move, but this takes time.

  Further, when the front and rear direction of a union nut used in a conventional union joint is misidentified and attached to the second pipe, the union nut and the union screw cannot be screwed together, and the union collar portion is connected to the second collar portion. The union nut cannot be removed from the second tube and reattached.

JP 11-257558 A

  The object of the present invention is to solve the above-mentioned problem and to attach the union nut to the second pipe even after the union collar portion is formed on the second pipe or after the second pipe is bent. The object is to provide a union joint.

  In order to achieve the above object, the present invention comprises the following aspects.

  1) A union joint for connecting a first pipe and a second pipe, from a union screw provided in the first pipe and an opening on the side connected to the first pipe in the second pipe A union collar portion provided at a certain distance and a union nut rotatably provided on the second pipe and screwed onto a union screw, the opening side from the union collar portion of the second pipe In the union joint in which the portion is an insertion portion inserted into the first pipe, the union nut has a slit portion opened from one end portion to the other end portion in the axial direction, and is substantially C when viewed from the axial direction. The width of the slit part is larger than the outer diameter of the part opposite to the insertion part via the union collar part in the second pipe and smaller than the outer diameter of the union collar part. , Union fitting.

  2) The slit part is formed so that one corner of the union nut whose outer periphery is formed in a polygon is located in the middle of the width direction of the slit part and covers two adjacent surfaces sandwiching the one corner, The union joint according to 1) above, wherein a part of each of the two adjacent surfaces remains in the union nut.

  According to the union joint of 1) above, the union nut has a slit portion opened from one end portion in the axial direction to the other end portion, and is substantially C-shaped when viewed from the axial direction. Since it is formed with a width larger than the outer diameter of the portion opposite to the insertion portion through the union collar portion of the pipe 2 and smaller than the outer diameter of the union collar portion, the slit portion through the union collar portion When the part opposite to the insertion part is fitted, the union nut is attached to the second pipe even after the union collar part is formed on the second pipe or after the second pipe is bent. Can do.

  Further, the union nut can be freely detached from the second pipe even after the union collars are formed on both end sides of the second pipe. Even when attached to the second tube, the union nut can be removed from the second tube and reattached in the correct direction.

  Also, since the end of the second pipe can be processed or bent before the union nut is attached to the second pipe, the second pipe can be easily processed without adding a new function. Is possible.

  Moreover, the union nut in which the slit part was formed can be reduced in weight about 20% compared with the conventional union nut in which the slit part is not formed.

  According to the union joint of 2) above, even if the slit portion is formed in the union nut, the number of outer surfaces of the union nut is 6, so the union has 5 surfaces with the slit portion formed on the entire surface. Compared with the nut, when tightening the union nut, six surfaces can be used, and convenience is improved.

It is a figure which shows the vehicle air conditioner which has piping to which the pipe | tube was connected using the union joint of this invention. It is a perspective view which shows the union joint of this invention. It is a perspective view which shows the state after attaching the union nut used for the union joint of this invention to the 2nd pipe | tube. It is a perspective view which shows the union nut used for the union joint of this invention. It is a perspective view which shows the attachment method of the union nut used for the union joint of this invention. It is a figure equivalent to FIG. 2 which shows the modification of the union nut used for the union joint of this invention. It is a figure equivalent to FIG. 3 which shows the modification of the union nut used for the union joint of this invention. It is a figure equivalent to FIG. 4 which shows the modification of the union nut used for the union joint of this invention.

  Embodiments of the present invention will be described with reference to the drawings. In the following description, the term “aluminum” includes aluminum alloys in addition to pure aluminum. Further, the six “corners” of the union nut include those obtained by chamfering the corners shown in FIGS. 6 to 8 in addition to the corners of the union nut shown in FIGS. In this embodiment, the X direction in FIG. 2 is the front and the opposite side is the rear.

  In FIG. 1, the refrigeration cycle constituting the vehicle air conditioner uses, for example, a chlorofluorocarbon refrigerant, and the refrigerant flowing out of the compressor (1), the condenser (3), and the condenser (3) Capacitor (2) having a receiver (4) and a supercooling section (5) that separates into a gas phase and a liquid phase, an evaporator (6), and a decompressor that depressurizes the refrigerant flowing into the evaporator (6) The first aluminum pipe (P1) having one end connected to the refrigerant outlet of the subcooling section (5) of the condenser (2). The aluminum second pipe (P2) having one end connected to the expansion valve (7) is connected by the union joint (10) so that the internal passages are communicated with each other.

  As shown in FIG. 2, the union joint (10) connecting the first pipe (P1) and the second pipe (P2) is a union screw (attached to the end of the first pipe (P1)). 11), a union collar part (12) formed at a certain distance from the opening (tip side) of the second pipe (P2) connected to the first pipe (P1), And a union nut (13) that is rotatably attached to the tube (P2) and screwed into the union screw (11).

  The union screw (11) includes a hexagonal head portion (14) and a male screw portion (15) extending in the axial direction from the head portion (14).

  Although not shown in the drawings, the union screw (11) is formed with a tube insertion hole extending in the axial direction from the end surface of the head (14) to the end surface of the male screw portion (15). The first pipe (P1) is inserted into the pipe insertion hole so that the end thereof is in close contact with the inner peripheral surface of the pipe insertion hole of the union screw (11).

  As shown in FIG. 3 and FIG. 4, the union collar portion (12) is formed from an annular bead that is formed with a diameter expanding radially outward and formed integrally with the second pipe (P2). Become. The portion of the second pipe (P2) on the front side of the union brim part (12) has an insertion part (16) inserted into the end of the first pipe (P1) with the outer peripheral surface being a cylindrical surface. It has become.

  An annular groove (18) into which the O-ring (17) is fitted is formed on the outer peripheral surface of the insertion portion (16) over the entire circumference, and the first pipe (P1) is formed in the groove (18). ) Is attached with an O-ring (17) that seals between the inner peripheral surface of the end portion and the outer peripheral surface of the second tube (P2).

  The union nut (13) is formed, for example, in a hollow shape whose outer periphery has a hexagonal cross section when viewed from the axial direction, and is threaded so as to be screwed with the male thread portion (15) of the union screw (11). An internal thread portion (19) is formed and configured.

  In addition, the rear end portion of the inner peripheral surface of the union nut (13) is formed with a locking portion (20) that is orthogonal to the axial direction of the union nut (13) and protrudes radially inward. A hole (21) into which the second pipe (P2) is inserted is formed at the center. The hole portion (21) has a diameter substantially equal to the outer diameter of the portion on the rear side of the union collar portion (12) of the second pipe (P2).

  The axial length of the female screw portion (19) is, for example, substantially the same as the axial length of the male screw portion (15) in the union screw (11).

  The union nut (13) has a slit portion (22) opened from the front end portion to the rear end portion in the axial direction in parallel with the axis, and is substantially C-shaped when viewed from the axial direction.

  In this embodiment, the slit portion (22) is formed to open from the front end portion to the rear end portion of one of the six surfaces of the union nut (13). Thereby, the number of the outer surfaces of the union nut (13) is five.

  The width of the slit portion (22) is larger than the outer diameter of the rear portion of the second collar (12) of the second pipe (P2) and smaller than the outer diameter of the union collar (12). ing. That is, the width of the slit part (22) is such that the union nut (13) is detachable from the slit part (22) to the rear part of the second collar (12) of the second pipe (P2) and the union collar. It is formed with a width that does not come off the part (12).

  As shown in FIG. 5, in order to attach the union nut (13) to the second pipe (P2), the union nut (13) is moved in the direction of the arrow in FIG. The rear portion from the union collar portion (12) is passed through the slit portion (22) of the union nut (13) and fitted into the hole portion (21).

  The union nut (13) attached to the second pipe (P2) is movably provided along the second pipe (P2) through the hole (21) and is larger than the hole (21). The movement of the union collar (12), which is the diameter, from the union collar (12) to the tip side (front direction of the second pipe (P2)) is restricted by being locked to the locking part (20). The That is, the union nut (13) is prevented from falling off from the end of the second pipe (P2) by the union collar (12).

  Then, the union nut (13) is moved to the distal end side of the second pipe (P2) and is screwed with the union screw (11) of the first pipe (P1), whereby the second pipe (P2). Is inserted into the end portion of the first tube (P1), and the first tube (P1) and the second tube (P2) are connected. Thus, a pipe (8) for connecting the capacitor (2) and the expansion valve (7) is configured.

  Next, a modified example of the union nut (13) will be described. In the description of this modification, the same reference numerals are given to the same components as those in the above embodiment, and the description thereof is omitted.

  As shown in FIG. 6, the union joint (101) connecting the first pipe (P1) and the second pipe (P2) is a union screw (attached to the end of the first pipe (P1)). 11), a union collar part (12) formed at a certain distance from the opening (tip side) of the second pipe (P2) connected to the first pipe (P1), And a union nut (131) that is rotatably attached to the tube (P2) and screwed into the union screw (11).

  As shown in FIGS. 7 and 8, the union nut (131) of this modified example is formed in a hollow shape having a hexagonal cross section when viewed from the axial direction, and is a male thread portion of the union screw (11). An internal thread portion (191) that is threaded so as to be screwed with (15) is formed.

  In addition, a locking portion (201) that is orthogonal to the axial direction of the union nut (131) and protrudes radially inward is formed at the rear end portion of the inner peripheral surface of the union nut (131). A hole (211) into which the second pipe (P2) is inserted is formed at the center. The hole (211) has a diameter that is substantially equal to the outer diameter of the portion on the rear side of the union collar (12) of the second pipe (P2).

  The axial length of the female screw portion (191) is formed, for example, approximately equal to the axial length of the male screw portion (15) in the union screw (11).

  The union nut (131) has a slit portion (221) opened from the front end portion to the rear end portion in the axial direction in parallel with the axis, and is substantially C-shaped when viewed from the axial direction.

  In this modification, the slit portion (221) has one corner of the six corners of the union nut (131) positioned at the center in the width direction of the slit portion (221), and two adjacent surfaces sandwiching the corner. Thus formed, a part of each of the two adjacent surfaces remains on the union nut (131).

  In this modification, one corner is described as being located at the center in the width direction of the slit portion (221), but one corner may be located at the middle in the width direction of the slit portion (221). It is not limited to.

  By forming the slit portion (221), two of the six surfaces on the outer surface of the union nut (131) are smaller than the other surfaces, but the number of outer surfaces of the union nut (131) is , 6 faces.

  Therefore, even if the slit part (221) is formed, the union nut (131) of the modified example can use six surfaces when tightening the union nut (131).

  Since the union nut (131) of the modified example is attached to the second pipe (P2) in the same manner as in the embodiment of the union nut (13), the description thereof is omitted.

  Since the union joints (10) and (101) of the present invention thus configured can be attached after the second pipe (P2) is bent, the union nuts (13) and (131) are attached to the second pipe (P2). (P2) will not interfere with the bending process.

  And the union nuts (13) and (131) of the present invention are formed even after the end of the second pipe (P2) is processed and the second pipe (P2) is bent. Since the nuts (13) and (131) can be attached to the second pipe (P2), the machining efficiency is greatly improved as compared with the conventional case.

  Even if the union nut (13) (131) is misidentified and attached to the second pipe (P2), and the union collar (12) is formed on the second pipe (P2), the union nut ( 13) (131) can be removed from the second pipe (P2), and the union nuts (13) (131) can be reattached to the second pipe (P2) in the correct direction.

  Further, the union nuts (13) and (131) in which the slit portions (22) and (221) are formed can be reduced in weight by about 20% compared to the conventional union nut in which the slit portions are not formed.

  In the above embodiment, the locking portion (20) is formed of an annular bead integrally formed with the second pipe (P2). However, the present invention is not limited to this, and the second portion is formed separately. It may be fixed to the tube.

  The union joint by this invention is used suitably for connecting two pipes used for piping of the refrigerating cycle which constitutes a vehicle air conditioner.

(P1) First pipe (P2) Second pipe (10) (101) Union joint (11) Union screw (12) Union collar part (13) (131) Union nut (16) Plug part (22) (221) Slit

Claims (2)

A union joint connecting the first pipe and the second pipe,
A union screw provided in the first tube;
A union collar provided at a certain distance from the opening of the second pipe connected to the first pipe;
A union nut rotatably mounted on the second tube and screwed onto the union screw;
In the union joint where the portion on the opening side from the union collar portion of the second tube is an insertion portion to be inserted into the first tube,
The union nut has a slit portion opened from one end portion in the axial direction to the other end portion, and is substantially C-shaped when viewed from the axial direction.
The width | variety of a slit part is a union joint formed in the width | variety larger than the outer diameter of the part on the opposite side to an insertion part through the union collar part in a 2nd pipe | tube, and smaller than the outer diameter of a union collar part.
The slit portion is formed so that one corner of a union nut whose outer periphery is formed in a polygon is positioned in the middle of the width direction of the slit portion and covers two adjacent surfaces sandwiching the one corner. The union joint according to claim 1, wherein a part of each of the two mating surfaces remains in the union nut.

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