JP4436298B2 - Pipe fitting - Google Patents

Description

  The present invention relates to a pipe joint, and more particularly, to a pipe joint suitable for handling a refrigerant in a refrigeration refrigerator or the like.

  Freon as a refrigerant that has been conventionally used in refrigerators and refrigerators has been replaced by carbon dioxide due to environmental problems. Since carbon dioxide as a refrigerant has a higher temperature and pressure than chlorofluorocarbon, the rubber seal used in the pipe joint in the cooling system swells, and the sealing function tends to be lowered.

  That is, the pipe joints conventionally used in the cooling system are usually connected to the male joint and the female joint, the valves attached to them are pushed into each other, and the respective flow paths communicate with each other. In order to prevent the refrigerant from leaking to the outside in the connected state, a rubber seal ring is disposed between the contact portions of the male joint and the female joint at a position surrounding the flow path. (Patent Document 1). For this reason, the seal ring is exposed to carbon dioxide as a refrigerant and swells, and the sealing function tends to be lowered.

Actually open hei 7-12694

  It is an object of the present invention to provide a pipe joint that is not affected by the deterioration of the sealing function caused by the refrigerant in such a cooling system.

That is, the present invention
In a pipe joint comprising a female member and a male member inserted and connected to the female member,
When the female member and the male member are connected to each other, the fluid passage of the female member and the connection portion of the fluid passage of the male member are mutually connected in the axial direction of the fluid passage. Having an annular abutment surface to abut,
One of the contact surfaces is a tapered surface tapered in the axial direction of the fluid passage, and the other is pressed against the tapered surface in the axial direction so that the corresponding contact surfaces are sealed. A pipe joint is provided.
According to this pipe joint, when the female member and the male member are connected, the contact surface around the connection portion of each fluid passage is formed as a tapered surface and a surface pressed against it. Both contact surfaces can be strongly contacted, and therefore it is possible to seal the surfaces without setting a rubber seal ring between them.

In particular,
The female member has a cylindrical female main body with a male member receiving portion for receiving the male member,
The male member receiving portion is provided with a female mold side opening / closing valve,
The female mold side opening and closing valve is
A stationary valve member located in the radially central portion of the male member receiving portion;
The annular fluid passage portion formed between the stationary valve member and the inner peripheral surface of the male member receiving portion is provided so as to be sealed, and is pushed by the distal end portion of the inserted male member, so that the female die A movable valve member that slides backward in the member to open the annular fluid passage,
The movable valve member and the distal end portion of the male member can have corresponding contact surfaces.

  In this case, on the inner peripheral surface of the female mold body, the corresponding contact surface of the male mold side cylindrical member is pressed against the corresponding contact surface of the female mold side cylindrical member, thereby sealing the corresponding contact surface. It is preferable to provide a locking portion that engages with the movable valve member to prevent the movable valve member from being pushed further when being moved. This is to facilitate the pressing between the contact surfaces.

  The locking portion has an annular surface surrounding the fluid passage, the movable valve member has an annular surface that engages with the locking portion, and one annular surface is tapered in the axial direction to be a tapered surface. When the male member is inserted and connected to the female member, the other annular surface can be pressed against the tapered surface to seal the two annular surfaces.

  Furthermore, it is preferable to provide pressing means for increasing the pressing force between the contact surfaces by attracting the male member and the female member with the male member inserted into the female member. Specifically, the pressing means is provided around one outer peripheral surface of the female member and the male member, and is provided on the inner peripheral surface spaced from the outer peripheral surface radially outward, and on the inner peripheral surface. A cylindrical female screw member that is rotatable on the outer peripheral surface, and a female screw and a screw member provided on the other outer peripheral surface of the female member and the male member. It can be composed of a male screw to be joined.

  In the pipe joint according to the present invention, sealing is possible without a rubber seal ring generally used for sealing between the female member and the male member in a connected state. Therefore, even if it is used for a refrigerant system in a refrigerator-freezer or the like using carbon dioxide as a refrigerant, sealing failure due to swelling of the seal ring, such as when a rubber seal ring is used, can be avoided.

  DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments of a pipe joint according to the present invention will be described with reference to the accompanying drawings.

  As shown in the figure, the pipe joint 10 according to the present invention has a female member 12 and a male member 14 inserted and connected to the female die.

  The female member 12 has a cylindrical female main body 18 having a male member receiving portion 16 for receiving the male member 14, and a female-side opening / closing valve 20 is provided in the male member receiving portion 16. Yes. In the figure, reference numeral 19 denotes an adapter screwed to the rear end of the female main body 18 and is connected to a conduit (not shown).

  The female-type on-off valve 20 is formed between a stationary valve member 22 located in the radial center portion of the male member receiving portion 16 and between the stationary valve member 22 and the inner peripheral surface of the male member receiving portion 16. The annular fluid passage portion 24 is provided so as to be sealed, is pushed by the distal end portion of the inserted male member 14, and slides backward in the female member 16 to open the annular fluid passage portion 24. And a movable valve member 26.

  The stationary valve member 22 includes a stem 23 that extends along the axial direction of the female main body 18. The stem has a disc-shaped head 25 having a stepped outer peripheral surface at a front end portion thereof, and a seal ring 32 made of tetrafluororesin (Teflon (registered trademark)) is set on the head 25. A cylindrical fixing member 27 for fixing the seal ring 32 to the outer peripheral surface of the stem 23 and a spider member provided on the rear end side thereof (that is, an annular member positioned on the outer peripheral surface of the stem is spaced in the circumferential direction). A support member 30 having a plurality of members extending in the radial direction and extending to the inner peripheral surface of the female main body 18, and a male screw formed at the rear end portion of the stem 23. It is fixed between the disk-shaped head 25 by a nut 29 engaged with a screw.

  The movable valve member 26 has a tubular shape as a whole and is biased forward by a compression spring 34. When the female member is separated from the male member as shown in FIG. It is sealingly engaged with the seal ring 32 of the member. In the figure, reference numerals 36 and 38 denote seal rings, and reference numeral 40 denotes a locking ball described later.

  The male member 14 has a cylindrical male main body 42, and an adapter 44 is screwed to the rear end thereof. An opening / closing valve 46 is provided inside the male main body 42 so as to be slidable in the axial direction of the male main body 42, and the male member 14 is separated from the female member 12 as shown in FIG. The front end opening of the male main body is closed by the compression spring 50 when it is in contact. In the figure, reference numeral 51 denotes a seal member made of tetrafluororesin (Teflon (registered trademark)) attached to the tip of the on-off valve 46. On the outer peripheral surface of the male main body 42, a cylindrical female screw member 52 is rotatably attached. As will be described later, a male screw 54 formed on the outer peripheral surface of the female main body 18 and a screw connection. It is supposed to be combined. In the figure, 56 indicates a stop ring.

  When the female member 12 and the male member 14 are connected, the male main body 42 is inserted into the male member receiving portion 16 of the female main body 18 from the tip thereof, and the cylindrical female screw member 52 is inserted into the female main body 52. The male main body 42 is inserted into the male member receiving portion 16 to the connecting position shown in FIG. Thus, the movable valve member 26 of the female mold member 12 is slid rearwardly within the female mold body 18 by the front end surface of the male mold body 42, and the annular fluid passage portion 24 at the front end of the female mold body 18. Is opened, and the fluid passage 58 of the female member communicates with the fluid passage 60 of the male member. Further, the locking ball 40 provided on the movable valve member 26 is fitted into an annular fitting recess 64 formed on the outer peripheral surface of the male main body 42. At the coupling position shown in FIG. The locking ball 40 is pressed into the fitting recess 64 by the inner peripheral surface of the female main body 18.

  As shown in FIG. 2, in a state where the female member 12 and the male member 14 are connected, the stepped annular locking portion 66 in which the movable valve member 26 is formed on the inner peripheral surface of the female main body 18. And is prevented from moving further rearward. The outer peripheral surface 68-1 of the tip 68 of the male main body 42 is pressed and engaged with a tapered surface 70 formed on the inner peripheral surface of the movable valve member 26. In other words, the tapered surface 70 is annular and tapered toward the rear of the female member 12 (that is, tapered), and the outer peripheral surface 68-1 of the tip 68 of the male main body 42 is cylindrical. By screwing the female screw member 52 into the male screw 54, the tip portion 68 is strongly pressed against the taper surface by the wedge action of the taper surface 70, and the sealing between the taper surface 70 and the outer peripheral surface 68-1 of the tip portion is sealed. Is intended. The taper angle is preferably about 10 ° to 30 °. Further, in order to perform this sealing more effectively, the taper surface 70 and the outer peripheral surface 68-1 of the tip 68 of the male main body have a higher surface finish than those of ordinary pipe fitting parts. And preferably Ra 1.6 or more, and if necessary, a mirror finish.

  The rear end portion of the movable valve member 26 is also provided with the same tapered surface 26-1, and the stepped annular locking portion 66 formed on the inner peripheral surface of the female main body is strongly pressed against the tapered surface. The seal between them is designed.

  As mentioned above, although the embodiment of the pipe joint according to the present invention has been described, the present invention is not limited to this, and includes, for example, the cylindrical female screw member 52 and the male screw 54, and the male main body 42 with respect to the tapered surface 70. As the pressing means for increasing the pressing force of the outer peripheral surface 68-1 of the distal end portion 68, a toggle mechanism using a lever or the like can be used.

It is the side view which showed the upper half part which shows the state from which the female type member and male type member of the pipe joint which concern on this invention were isolate | separated, respectively. It is the side view which showed the upper half part in the state in which the female type member and the male type member were connected in cross section.

Explanation of symbols

Pipe fitting 10
Female member 12
Male member 14
Male member receiving part 16
Female body 18
Adapter 19
Female mold side open / close valve 20
Stationary valve member 22
Fluid passage part 24
Movable valve member 26
Tapered surface 26-1 (annular surface)
Spider 30
Seal ring 32
Compression spring 34
Seal ring 36, 38
Rocking ball 40
Male body 42
Adapter 44
On-off valve 46
Compression spring 50
Rubber seal 51
Tubular female thread member 52
Male screw 54
Stop ring 56
Fluid passage 58
Fluid passage 60
Fitting recess 64
Annular locking part 66 (having an annular surface)
Tip 68
Outer peripheral surface 68-1 (contact surface)
Tapered surface 70 (contact surface)

Claims (3)

In a pipe joint comprising a female member and a male member inserted and connected to the female member,
When the female member and the male member are connected to each other, the fluid passage of the female member and the connection portion of the fluid passage of the male member are mutually connected in the axial direction of the fluid passage. Having an annular abutment surface to abut,
One of the contact surfaces is a tapered surface tapered in the axial direction of the fluid passage, and the other is pressed against the tapered surface in the axial direction so that the corresponding contact surfaces are sealed. Has been
The female member has a cylindrical female main body with a male member receiving portion for receiving the male member,
The male member receiving portion is provided with a female mold side opening / closing valve,
The female mold side opening and closing valve is
A stationary valve member located in the radially central portion of the male member receiving portion;
The annular fluid passage portion formed between the stationary valve member and the inner peripheral surface of the male member receiving portion is provided so as to be sealed, and is pushed by the distal end portion of the inserted male member, so that the female die A movable valve member that slides backward in the body and opens the annular fluid passage;
Have
The movable valve member and the distal end portion of the male member have corresponding contact surfaces,
On the inner peripheral surface of the female main body, when the corresponding contact surface of the tip of the male member is pressed against the corresponding contact surface of the movable valve member, the movable contact member is sealed. A locking portion that engages with the valve member and prevents the movable valve member from being pushed further;
A pressing means for increasing the pressing force between the contact surfaces by attracting the male member and the female main body to each other
Pipe fittings characterized by The engaging portion has an annular surface surrounding the fluid passage, the movable valve member has an annular surface that engages with the engaging portion, and one annular surface is tapered in the axial direction to be a tapered surface; 2. The pipe joint according to claim 1 , wherein when the male member is inserted and connected to the female main body, the other annular surface is pressed by the tapered surface so as to seal between the annular surfaces. The pressing means is provided around one outer peripheral surface of the female member and the male member, an inner peripheral surface spaced radially outward from the outer peripheral surface, and a female screw provided on the inner peripheral surface; A cylindrical female screw member that is rotatable on the outer peripheral surface, and a male screw that is provided on the outer peripheral surface of the other of the female member and the male member and that is screw-engaged with the female screw of the cylindrical female screw member The pipe joint according to claim 1 or 2 , characterized by comprising: "

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