JP2007107585A - High-pressure piping joint - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a high-pressure piping joint capable of preventing a blow of a pressurized fluid when separating an outer pipe member and inner pipe member and restraining a discharge of the pressurized fluid into atmospheric air. <P>SOLUTION: An O-ring 25 internally located at a fluid passage 21 side and an O-ring 27 located at an atmospheric air side and having an outer diameter larger than the O-ring 25 are provided on a joint 24 for the outer pipe member 22 and inner pipe member 23. Insertion holes 33 and 32 having inner diameters smaller than respective outer diameters of the O-rings 25 and 27 are arranged on the outer pipe member 22, and a length D1 in an axial direction of the insertion hole 32 is set up to be greater than a distance D2 between the O-rings 25 and 27 in an axial direction. Thus, when the outer pipe member 22 and inner pipe member 23 are separated, coolant gas remaining between the O-rings 25 and 27 can be discharged to the fluid passage 21 so that a gap is formed by moving the O-ring 25 into the hole 32 with a greater diameter. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a high-pressure pipe joint having a fluid passage through which a high-pressure fluid flows, and more particularly, to a high-pressure pipe joint suitable for using a refrigerant such as carbon dioxide whose high-pressure side is supercritical.

  FIG. 7 is a sectional view showing a conventional example of this type of high-pressure pipe joint. A high-pressure pipe joint 1 shown in FIG. 7 has a fluid passage 2 in which high-pressure refrigerant gas flows and has an outer tube member 3 and an inner tube member 4 joined to each other. A first O-ring 6 and a second O-ring 7 that are located on the high-pressure refrigerant gas side and the atmosphere side, respectively, are provided at the joint 5 of the inner pipe member 4. In the conventional high-pressure pipe joint 1 configured as described above, when the high-pressure refrigerant gas passes through the gap between the outer pipe member 3 and the inner pipe member 4 sealed by the first O-ring 6, A part of the second O-ring 7 plastically deformed by the high-pressure refrigerant gas blows out to the atmosphere side and is blocked by the concave weir 8 or the like, thereby filling the gap 9 between the outer tube member 3 and the inner tube member 4. Therefore, the refrigerant gas can be prevented from flowing out.

  Further, another high-pressure pipe joint 10 shown in FIG. 8 has a fluid passage 11 through which high-pressure refrigerant gas flows, and has an outer pipe member 12 and an inner pipe member 13 that are joined to each other. A first O-ring 15 and a second O-ring 16 that are located on the high-pressure refrigerant gas side and the atmosphere side, respectively, are provided at the joint portion 14 of the pipe member 12 and the inner pipe member 13. A seal groove 17 having a triangular cross section for accommodating the second O-ring 16 is formed on the inner peripheral side of the end portion of the outer tube member 12. In the conventional high-pressure pipe joint 10 thus configured, the second O-ring 16 attached to the end of the outer pipe member 12 when the outer pipe member 12 and the inner pipe member 13 are separated. As a result, the refrigerant gas remaining between the O-rings 15 and 16 is released into the atmosphere.

Further, the high-pressure pipe joint 18 shown in FIG. 9 has a face seal attached to the end of the outer pipe member 12 instead of the second O-ring 16 as compared with the high-pressure pipe joint 10 shown in FIG. It has the member 19, and the other structure is fundamentally the same. In the conventional high-pressure pipe joint 18 configured as described above, when the outer pipe member 12 and the inner pipe member 13 are separated, the face seal member 19 and the inner pipe that are attached to the end of the outer pipe member 12 are separated. Since the engaged state with the member 13 is released, the refrigerant gas remaining between the face seal member 19 and the O-ring 15 is released into the atmosphere.
Japanese Patent Laying-Open No. 2005-3110 (paragraph number 0024, FIG. 1)

  However, in the prior art described in Patent Document 1 described above, when the outer tube member 3 and the inner tube member 4 are separated, the sealed state by the O-rings 6 and 7 is maintained. Since the refrigerant gas remains between them, there is a problem that when the engagement state between the O-rings 6 and 7 and the outer tube member 3 is released, the refrigerant gas blows out and generates noise.

  In addition to the above problems, the prior art shown in FIGS. 8 and 9 has a problem that refrigerant gas is released into the atmosphere when the outer tube member 12 and the inner tube member 13 are separated.

  The present invention has been made in consideration of the above-described prior art. The purpose of the present invention is to prevent pressure fluid from blowing out when the outer tube member and the inner tube member are separated, and to release the pressure fluid into the atmosphere. An object of the present invention is to provide a high-pressure pipe joint capable of suppressing the above.

  In order to achieve the above object, the present invention has an outer tube member and an inner tube member that are formed with a fluid passage through which a high-pressure fluid flows, and is joined to each other, and a junction between these outer tube member and inner tube member. A high-pressure pipe joint including a first shaft seal member located on the fluid passage side and a second shaft seal member located on the atmosphere side, and a fluid passage through which the high-pressure fluid flows. The outer tube member and the inner tube member that are formed and joined to each other, the first shaft seal member located on the fluid passage side at the joint portion of the outer tube member and the inner tube member, and the atmosphere side A high-pressure pipe joint having a second shaft seal member positioned, wherein an outer diameter of the first shaft seal member is set smaller than an outer diameter of the second shaft seal member, and 1 shaft seal member and the second shaft seal member are inserted. When the step is provided in the axial direction of the hole and the outer tube member and the inner tube member are separated, the first shaft is released before the second shaft seal member releases the state of sealing the insertion hole. The seal member is configured to release the state of sealing the insertion hole.

  In the present invention configured as described above, when the outer tube member and the inner tube member are joined, the first shaft seal member and the second seal member are respectively inserted into the insertion holes having a step in the axial direction. Thus, the gap between the joint portions of the outer tube member and the inner tube member is double sealed. Next, when separating the outer tube member and the inner tube member, when the state where the first shaft seal member located on the fluid passage side passes through the step of the insertion hole and seals the insertion hole is released, Since the state in which the shaft seal member seals the insertion hole is maintained, the pressure fluid remaining between the first shaft seal member and the second shaft seal member is discharged into the fluid passage. Next, the state in which the second shaft seal member seals the insertion hole is also released by further separating the outer tube member and the inner tube member. Accordingly, it is possible to prevent the pressure fluid from being blown out during the separation of the outer tube member and the inner tube member, and to suppress the release of the pressure fluid into the atmosphere.

  In the present invention, it is possible to prevent the pressure fluid from blowing out when the outer tube member and the inner tube member are separated and to suppress the release of the pressure fluid into the atmosphere. There is an effect that noise can be reduced by eliminating sound.

  Hereinafter, the details of the high-pressure pipe joint according to the embodiment of the present invention will be described with reference to the drawings.

[First Embodiment]
1 is a cross-sectional view showing a high-pressure pipe joint 20 according to the first embodiment of the present invention, FIG. 2 is a cross-sectional view showing a state where an outer pipe member and an inner pipe member provided in the present embodiment are joined, FIG. 3 is an enlarged sectional view showing a part of the inner tube member provided in the present embodiment.

  As shown in FIG. 1, the high-pressure pipe joint 20 of the present embodiment has a fluid passage 21 in which a high-pressure fluid, for example, high-pressure refrigerant gas flows, formed therein, and an outer tube member 22 and an inner tube member 23 that are joined to each other. The joint portion of the outer tube member 22 and the inner tube member 23 has an O-ring 25 positioned on the fluid passage 21 side and an O-ring 27 positioned on the atmosphere side.

  As shown in FIG. 3, the inner tube member 23 has a large-diameter cylinder portion 28 and a small-diameter cylinder portion 29 that are inserted into the outer tube member 22, and an O-ring 27 is attached to the large-diameter cylinder portion 28. A seal groove 30 is formed, and a seal groove 31 in which the O-ring 25 is mounted is formed in the small diameter cylindrical portion 29. The thickness (diameter) of the O-ring 25 is set to be larger than the depth dimension of the seal groove 31, and the O-ring 25 protrudes outward from the seal groove 31. Further, the thickness (diameter) of the O-ring 27 is set larger than the depth dimension of the seal groove 30, and the O-ring 27 slightly protrudes from the seal groove 30. Further, the outer diameter of the O-ring 25 is set smaller than the outer diameter of the O-ring 27.

  An insertion hole 32 into which the large-diameter cylindrical portion 28 is inserted and an insertion hole 33 having an inner diameter smaller than the insertion hole 32 and into which the small-diameter cylindrical portion 29 is inserted are coaxially formed in the outer tube member 22. ing. A tapered surface 41 is formed between the insertion hole 32 and the insertion hole 33 of the outer tube member 22, and a tapered surface corresponding to the tapered surface 41 is formed between the large diameter cylindrical portion 28 and the small diameter cylindrical portion 29 of the inner tube member 23. 42 is formed. The depth dimension (axial dimension) D1 of the insertion hole 32 is set to be larger than the axial distance D2 between the O-ring 25 and the O-ring 27, as shown in FIG.

  Further, a screw member (not shown) is inserted into the through hole 36 of the inner tube member 23, and the distal end side thereof is screwed into the screw hole 37 of the outer tube member 22, thereby joining the outer tube member 22 and the inner tube member 23. Sometimes an axial clamping force is applied.

  In the first embodiment, when the outer tube member 22 and the inner tube member 23 are joined, the inner tube member 23 is moved in the axial direction with respect to the outer tube member 22, and as shown in FIG. The O-ring 25 and the O-ring 27 of the member 23 are inserted from one end of the outer tube member 22. As a result, the O-ring 27 is pressed in the radial direction by the inner peripheral surface of the insertion hole 32, so that the gap between the large diameter cylindrical portion 28 and the insertion hole 32 is sealed. Next, a screw member (not shown) is inserted into the through hole 36 of the inner tube member 23 and screwed into the screw hole 37 of the outer tube member 22, so that an axial clamping force is applied to the outer tube member 22 and the inner tube member 23. Give. As a result, the O-ring 25 slides on the tapered surface 41 from the insertion hole 32 and moves into the insertion hole 33, and the O-ring 25 is pressed in the radial direction by the inner peripheral surface of the insertion hole 33. Therefore, the gap between the small diameter cylindrical portion 29 and the insertion hole 33 is sealed (see FIG. 2). When the high-pressure refrigerant gas flows through the fluid passage 21 in this joined state, the gap in the joint is double-sealed by the O-ring 25 and the O-ring 27, so that the high-pressure refrigerant gas flows out from the joint. Is blocked.

  Thereafter, when the supply of the high-pressure refrigerant gas is stopped and the outer tube member 22 and the inner tube member 23 are separated, the screw member (not shown) is loosened to release the tightened state, and the inner tube member 23 is pulled out in the axial direction. Accordingly, as shown in FIG. 1, the O-ring 25 moves from the insertion hole 33 into the insertion hole 32, and a gap is formed between the O-ring 25 and the inner peripheral surface of the insertion hole 32. As a result, the state in which the O-ring 25 seals the insertion hole 33 is released. At this time, the depth dimension (axial dimension) D1 of the insertion hole 32 is set larger than the axial distance D2 between the O-ring 25 and the O-ring 27 as shown in FIG. The insertion hole 32 is sealed by the O-ring 27. Accordingly, the pressure fluid remaining between the O-ring 25 and the O-ring 27 passes through the clearance around the O-ring 25 and is discharged to the fluid passage 21. Thereafter, the outer tube member 22 and the inner tube member 23 are completely separated by further pulling out the inner tube member 23 in the axial direction.

  In the first embodiment configured as described above, the refrigerant gas remaining between the O-rings 25 and 27 at the time of separation of the outer tube member 22 and the inner tube member 23 is passed through the clearance around the outer periphery of the O-ring 25. Since it discharges | emits to the fluid channel | path 21, while discharge | release of refrigerant | coolant gas to air | atmosphere can be suppressed, blowing-out of refrigerant | coolant gas can be prevented.

  In the first embodiment, the O-ring 25 can be smoothly guided from the insertion hole 32 into the insertion hole 33 by the tapered surface 41 formed between the insertion holes 32 and 33 of the outer tube member 22. Damage to the O-ring 25 can be prevented.

[Second Embodiment]
4 is a cross-sectional view showing a high-pressure pipe joint 40 according to the second embodiment of the present invention, FIG. 5 is a cross-sectional view showing a state where the outer pipe member and the inner pipe member provided in the present embodiment are joined, FIG. 6 is a front view of the outer tube member provided in the present embodiment. In addition, sectional drawing of the outer tube | pipe member shown in FIG. 4 is sectional drawing in alignment with the AA of FIG.

  A high-pressure pipe joint 40 according to the present embodiment shown in FIG. 4 has a fluid passage 21 in which a high-pressure fluid, for example, high-pressure refrigerant gas flows, and has an outer pipe member 22 and an inner pipe member 23 that are joined to each other. The joint 24 of the outer tube member 22 and the inner tube member 23 has an O-ring 25 and a backup ring 26 located on the fluid passage 21 side, and an O-ring 27 located on the atmosphere side. ing.

  The inner tube member 23 has a large-diameter tube portion 28 and a small-diameter tube portion 29 that are inserted into the outer tube member 22, and a seal groove 30 in which an O-ring 27 is mounted is formed in the large-diameter tube portion 28. The small diameter cylindrical portion 29 is formed with a seal groove 31 in which the O-ring 25 and the backup ring 26 are mounted. The thickness (diameter) of the O-ring 25 is set to be equal to or less than the depth dimension of the seal groove 31, and the outer circumferences of the O-ring 25 and the backup ring 26 are substantially the same as the outer circumference opening of the seal groove 31, and the inside thereof positioned. On the other hand, the thickness (diameter) of the O-ring 27 is set larger than the depth dimension of the seal groove 30, and the O-ring 27 slightly protrudes from the seal groove 30. The outer diameters of the O-ring 25 and the backup ring 26 are set smaller than the outer diameter of the O-ring 27.

  The outer tube member 22 has an insertion hole 32 into which the large-diameter cylindrical portion 28 is inserted, an insertion hole 33 having an inner diameter smaller than the insertion hole 32, and a smaller-diameter cylindrical portion 29 having a smaller inner diameter. The small-diameter hole 34 is formed coaxially, and a step is provided in the middle of the insertion hole 32 and the insertion hole 33 in the axial direction. The depth dimension (axial dimension) D1 of the insertion hole 32 is set to be larger than the axial distance D2 between the O-ring 25 and the O-ring 27.

  As shown in FIG. 5, the screw member 35 is inserted into the through hole 36 of the inner tube member 23, and the distal end side of the screw member 35 is screwed into the screw hole 37 of the outer tube member 22. When the tube member 23 is joined, an axial tightening force is applied.

  In the second embodiment, when the outer tube member 22 and the inner tube member 23 are joined from the separated state, the inner tube member 23 is moved in the axial direction with respect to the outer tube member 22, and the inner tube The O-ring 25, the backup ring 26 and the O-ring 27 of the member 23 are inserted into the insertion holes 32 of the outer tube member 22. As a result, the O-ring 27 is compressed in the radial direction by the inner peripheral surface of the insertion hole 32, so that the gap between the large diameter cylindrical portion 28 and the insertion hole 32 is sealed. Next, as shown in FIG. 5, the screw member 35 is inserted into the through hole 36 of the inner tube member 23 and screwed into the screw hole 37 of the outer tube member 22, so that the shaft is fitted to the outer tube member 22 and the inner tube member 23. Apply direction tightening force. As a result, the O-ring 25 and the backup ring 26 move from the insertion hole 32 into the insertion hole 33, and the O-ring 25 is pressed in the axial direction via the backup ring 26 by the inner wall at the end of the insertion hole 33. Therefore, the O-ring 25 extends in the radial direction, and the gap between the small diameter cylindrical portion 29 and the insertion hole 33 is sealed. When the high-pressure refrigerant gas flows through the fluid passage 21 in this joined state, the gap between the joint portions 24 is doubly sealed by the O-ring 25 and the O-ring 27, so that the high-pressure refrigerant gas flows out from the joint portion 24. To be prevented.

  Thereafter, when the supply of the high-pressure refrigerant gas is stopped and the outer tube member 22 and the inner tube member 23 are separated, the screw member 35 is loosened to release the tightened state, and the inner tube member 23 is pulled out in the axial direction. Since the state of pressing the O-ring 25 in the axial direction through the backup ring 26 at the inner wall at the end of the insertion hole 33 is released, the O-ring 25 returns to the inside of the seal groove 31 so that the O-ring 25 The state of sealing the insertion hole 33 is released. At this time, since the state in which the O-ring 27 seals the insertion hole 32 is maintained, the refrigerant gas remaining between the O-ring 25 and the O-ring 27 passes through the clearance around the outer periphery of the O-ring 25 and is fluidized. It is discharged into the passage 21. Then, by further pulling out the inner tube member 23 in the axial direction, the outer tube member 22 and the inner tube member 23 are completely separated.

  In this embodiment, since the O-ring 25 is pushed out by the backup ring 26 and bulges outward or returns to the inside of the seal groove 31, it is in close contact with and released from the inner wall of the cylinder. It is not necessary to form the large diameter cylindrical portion and the small diameter cylindrical portion. Further, the groove depths of the seal grooves 30 and 31 can be set to be the same.

  In the second embodiment configured as described above, the refrigerant gas remaining between the O-rings 25 and 27 at the time of separation of the outer tube member 22 and the inner tube member 23 is passed through the clearance on the outer periphery of the O-ring 25. Since it discharges | emits to the fluid channel | path 21, while discharge | release of refrigerant | coolant gas to air | atmosphere can be suppressed, blowing-out of refrigerant | coolant gas can be prevented.

  In the second embodiment, the O-ring 25 is smoothly inserted without damaging the O-ring 25 when the outer tube member 22 and the inner tube member 23 are joined by the backup ring 26 provided on the fluid passage 21 side of the O-ring 25. The backup ring 26 can prevent the O-ring 25 from coming out of the seal groove 31 and remaining in the outer tube member 22 when the outer tube member 22 and the inner tube member 23 are separated from each other.

  Further, in the first embodiment, the axial length dimension D1 of the insertion hole 32 is set larger than the axial distance D2 between the O-rings 25 and 27. However, in the second embodiment, this is not always necessary. Absent. That is, the O-ring 27 remains in the insertion hole 32 when the O-ring 25 moves by a distance necessary to return to its original shape without being pressed by the backup ring 26. What is necessary is just to be in the state sealed with the atmosphere side. With this structure, the refrigerant gas between the O-rings 25 and 27 can be reliably discharged into the internal fluid passage 21 instead of in the atmosphere.

  In the second embodiment, O-rings 25 and 27 having different outer diameters are provided as shaft seal members for sealing the joint portion 24 of the outer tube member 22 and the inner tube member 23. It is possible to prevent the O-rings 25 and 27 from being assembled by mistake, and a special shaft seal member is not required, so that the part cost can be reduced. Further, if necessary, another shaft seal member can be provided instead of the O-rings 25 and 27 described above.

  In the above-described embodiment, the case where the high-pressure refrigerant gas is used as the high-pressure fluid has been exemplified. However, the present invention is not limited to this, and can be applied to the case where other high-pressure fluid is used.

  Since the present invention has an effect of reducing noise caused by blowing out the high pressure fluid when the outer pipe member and the inner pipe member are separated, the present invention can be applied as a high-pressure pipe joint of an air conditioner using a high-pressure refrigerant. It can be widely applied as a high-pressure pipe joint for industrial use or industrial machinery.

It is sectional drawing which shows the high-pressure piping joint which concerns on the 1st Embodiment of this invention. It is sectional drawing which shows the state which joined the outer tube | pipe member and inner tube | pipe member provided in this Embodiment. It is sectional drawing which expands and shows a part of inner pipe member provided in this Embodiment. It is sectional drawing which shows the high-pressure piping joint which concerns on the 2nd Embodiment of this invention. It is sectional drawing which shows the state which joined the outer tube | pipe member and inner tube | pipe member provided in this Embodiment. It is a front view of the outer tube member provided in this embodiment. It is sectional drawing which shows the prior art example of the piping joint for high pressures. It is sectional drawing which shows the other conventional example of the high-pressure piping joint. It is sectional drawing which shows the other conventional example of the high-pressure piping joint.

Explanation of symbols

20, 40 High-pressure pipe joint 21 Fluid passage 22 Outer pipe member 23 Inner pipe member 24 Joint 25 O-ring (first shaft seal member)
26 Backup ring 27 O-ring (second shaft seal member)
28 Large Diameter Cylinder 29 Small Diameter Cylinder 30 Seal Groove 31 Seal Groove 32 Insertion Hole 33 Insertion Hole 34 Small Diameter Hole 41 Tapered Surface 42 Tapered Surface

Claims (1)

A fluid passage (21) through which high-pressure fluid flows is formed, and has an outer tube member (22) and an inner tube member (23) joined to each other, and these outer tube member (22) and inner tube member ( 23) a high-pressure pipe joint provided with a first shaft seal member (25) located on the fluid passage (21) side and a second shaft seal member (27) located on the atmosphere side at the joint portion of 23) (20, 40)
The outer diameter of the first shaft seal member (25) is set smaller than the outer diameter of the second shaft seal member (27), and the first shaft seal member (25) and the second shaft are set. A step is provided in the axial direction of the insertion hole (32, 33) into which the seal member (27) is inserted,
When the outer tube member (22) and the inner tube member (23) are separated, the first shaft seal member (27) is released from the state of sealing the insertion hole (32) before the first shaft member (22) is released. The high-pressure pipe joint (20, 40), wherein the shaft seal member (25) releases the state of sealing the insertion hole (33).

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