JPH033833B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a pipe joint for joining the ends of pipes.

The invention is particularly applicable to, for example, British Patent No. 1573945;
It is applied to pipe joints of the type described in the specifications of No. 2033518 and No. 2113335. The pipe joint of this specification has a pin member having a truncated conical outer circumferential surface, and a tubular box member having a truncated conical inner circumferential surface, the inner circumferential surface of the box member corresponding to the outer circumferential surface of the pin member, Further, when the two members are fully connected, the inner circumferential surface of the box member covers the outer circumferential surface of the pin member. In use, the two types of members are telescopingly mated and axially fixed. This fixation is performed by the coupling annular protrusion on the inner circumferential surface and the recess on the outer circumferential surface.

When the above two types of members are combined in a telescoping manner,
First, the truncated conical portions are pushed in until they come into surface contact, and this surface contact seals between the members. The box member then expands and/or contacts the pin member when pressurized fluid is properly placed between the members. Simultaneously, an axial force is applied to the members, causing them to come together. As a result, the pin member having the protrusion and the box member having the recess are coupled together. When this member is removed, pressurized fluid is again introduced between the members. This member may then expand and/or contact the pin member. There, it comes into contact with the above member. Then, the protrusion of the member gradually disengages from the recess, and as a result, the two members are separated in the axial direction. However, in order for the pressurized fluid to work effectively, both ends of the overlapping truncated conical portions must be sealed. As has already been shown, if either of the two members becomes biased during the expansion and/or contact, the seal will be broken as this member will distort into an oval shape. This reduces the pressure of the fluid, making it impossible to remove the member.

Furthermore, especially when the pipe is used for transporting pressurized fluid, it is necessary to seal between the members of the joint to prevent leakage of the fluid. In addition, especially when the outside is a pressurized fluid, for example underwater, it is necessary to seal between the joints to prevent infiltration of the outside fluid.

A pipe fitting provided in accordance with the present invention has a tubular pin member, the pin member having a generally frustoconical outer peripheral surface, and a main pipe fitting having a tubular box member, the box member having a generally frustoconical outer peripheral surface. The box member has an inner circumferential surface generally shaped like a truncated cone, and the inner circumferential surface of the box member corresponds to the outer circumferential surface of the pin member, and the inner circumferential surface of the box member corresponds to the outer circumferential surface of the pin member when the two members are fully connected. The frustoconical shapes of both members have an annular protrusion and a groove, and these two types of parts overlap with each other when the two members are fully connected and fixed in the axial direction. Although it is engaged,
In the mains joint, one of the members has an annular protrusion that extends around the inner peripheral surface of the one member and towards the free end of the one member. The protrusion has an annular first end face that is generally radially oriented, and the protrusion has an annular second end face that is generally radially oriented. This second
The end portion faces the surrounding surface, the second end portion is between the first end surface portion and the surrounding surface of the second end portion, and the other member has an annular first end portion. a first end surface, the first end surface being generally radial, the first end surface contacting the first end surface of the projection when the members are fully engaged; The member has an annular, generally radially oriented second end surface that faces and laterally contacts the second end surface of the projection when the members are fully engaged.

The one member may be the pin member or the box member.

The second end surface of the one member is generally frustoconical, and the second end surface slopes in a direction opposite to the direction of the peripheral surface of the frustocone. For example, this second
The end portion may be frustoconical, or the second end portion may include two frustoconical portions, the two frustoconical portions having a frustoconical or rounded first portion and a generally frustoconical first portion. The second part is cylindrical.

A second end surface portion of the other member may be provided with a rounded portion, and the rounded portion may contact the second end surface portion of the one member when the two members are engaged with each other. The rounded portion may form a portion that comes into contact with the one second end surface portion when the two members are engaged with each other. Alternatively, the second end view of the other member is generally frustoconical in shape, the frustoconical portion corresponding to the generally frustoconical portion of the second end face of the one member; The two corresponding parts can be brought into contact when the two corresponding parts are fully engaged.

In one embodiment, the second end portion of the one member has a frustoconical or rounded first portion and a cylindrical second portion between the first ends; The second end portion of the other member has a rounded portion, and the rounded portion initially contacts the first portion of the second end portion of the one member; The portion contacts the first end surface of the other member by a cylindrical portion, and the cylindrical portion of the other member contacts the cylindrical portion of the one member when the two members are fully engaged. Contact from the side.

When the main pipe joint is used to connect pipe parts, if it is a place that receives an axial force, for example, a place where piles are driven, it is possible to transmit the received force by press-fitting the first end surface. Yes, this first
The joint between the end faces is maintained by appropriately sizing the interengaging projections and grooves of the two members.

Advantageously, the second end surfaces of the members are in a press-fit connection when the members are fully engaged, thereby creating a seal between the members, which seal is formed using the members. It works effectively both when removing and removing.

A first end surface portion and a second end surface portion are provided at the free end portion of the one member and the inner peripheral surface end portion of the other member, and the second end surface portion is formed when the pin member and the box member are fully engaged. Although there is no lateral gap, the first end faces are axially spaced apart.

The first end surface portion and the second end surface portion are not provided in a portion between the first end surface portion and the second end surface portion of the peripheral surface of the member, the groove portion is spaced apart in the radial direction, and the portion is separated from the first end surface portion and the second end surface portion. It may have a truncated conical shape or a cylindrical shape with a conical shape having the same or different shape with respect to the other surfaces of the member, or one side may be cylindrical and the other side may have a truncated conical shape.

A sealing device may be provided for sealing between the two members, the sealing device having an annular resilient compressible member, the member being connected to the protrusion of the one member. The disposed sealing device is provided between the body of the member and is engaged by the free end of the other member. A similar resilient annular compressible sealing member may be provided at the inner end of the other member and is engaged by the free end of the one member. As an alternative embodiment, a protrusion protruding in the radial direction is disposed adjacent to one end or both ends of the circumferential surface of the one member, and the protrusion is press-fitted to the circumferential surface of the other member. be able to.

In one embodiment, a radial protrusion is provided on the peripheral surface of the other member, the protrusion being adjacent to the free end of the other member; The first and second end surfaces thereof are brought into engagement for sealing, and the protrusion deflects the second end surface of the other member so that the second end surface of the other member The second end surface portion of the other member is arranged so as to be brought into contact with the second end surface portion of the one member due to the deflection. A radial projection similar to that described above may be provided on the peripheral surface of the one member adjacent to the free end of the one member.

Hereinafter, embodiments of the present invention will be explained in detail with reference to the drawings.

As shown in FIGS. 1 to 3, the pipe fitting according to the present invention has a tubular pin member 1 and a tubular box member 3, both of which are connected to the ends of a pipe (not shown). It is for joining parts. The pin member and box member are telescopically engaged. Both members have generally frustoconical outer and inner circumferential surfaces 5, 6, respectively, which surfaces overlap each other when the pin member is fully engaged with the box member.

In order to fix the pin member to the box member in the axial direction when the pin member 1 and the box member 3 are fully inserted and engaged as described above, an axially extending ring is provided on the periphery of the frustoconical surface 6 of the box member. A plurality of extending annular grooves (or protrusions) are arranged at intervals. The grooves (or protrusions) each extend in a radial plane. The pin member has spaced apart circular protrusions (or grooves) extending in the axial direction, and the protrusions correspond to the grooves (or protrusions). The groove portion and the protrusion portion are connected to the broken line portion 7 of the surfaces 5 and 6,
Diagrammatically shown at 8. However, details have been omitted. The protrusions and grooves described above are described, for example, in British Patent No.
It may be as described in the specifications of No. 157394, No. 2033518, and No. 2113335, and the protrusions and grooves described in detail in the above specifications may be referred to.

As shown in the figure, the protrusions and grooves 7, 8
does not extend over the entire length of said peripheral surfaces 5, 6, and the projections and grooves include annular end surfaces 9, 10 and 11, 12. As shown in the figure, the end face portions 9 to 12 have an outer circumferential surface 5,
It has the same truncated conical shape as the conical shape of the inner circumferential surface 6 other than the end surface, and the surfaces of the end surfaces 9 to 12 are the top surface of the protrusion and the bottom of the groove. Extends between surfaces. In order to improve this, the surfaces 9, 12 may extend at the same height as the tops of the projections and the surfaces between the grooves, and the surfaces 10, 11 may extend at the same height as the tops of the projections and the surfaces between the grooves. It may be extended at the same height as the bottom or other parts of the board. Another refinement is to make said surfaces 9 to 12 conical and have the same diameter as the diameter of the protrusions and grooves adjacent to said surfaces 9 to 12, so that said surfaces 9 to 12 are as described above. may be aligned with the top surface and the bottom surface, or between the top surface and the bottom surface. Also, instead of doing as above,
The surfaces 10 and 11 are cylindrical, and the surfaces 9 and 12 are cylindrical.
may be made into a truncated cone shape. Here, when any of the above-mentioned surfaces 9 to 12 is made into a truncated cone shape, instead of making the cone angle of this surface the same as the portion of the above-mentioned surfaces 9 to 12 other than this surface, There is no problem in making the cone angle of the surface larger than that of other surfaces. Furthermore, since the surfaces 9 to 12 have the dimensions described above, when the members are fully inserted and engaged,
The surfaces may be slightly radially separated or in close contact, but the surfaces do not come into contact due to press fitting. If the above surfaces are separated in the radial direction,
The pair of surfaces is provided with a spherical protrusion in the radial direction as described below, and the dimensions of the pair of surfaces are sealed in the radial direction from the other pair of surfaces. Make it a size like this.

As described in the disclosure specification, when attaching and detaching the member, pressurized fluid is applied to the overlapping portion of the outer circumferential surface 5 and the inner circumferential surface 6 through the radial passage 2 of the box member. The pressurized fluid is applied through the entire axial portion of the protrusions and grooves of the surfaces 5, 6. The passageway 2 communicates with an axial groove in the face 6 of the box member or with the face 5 of the pin member and the face 6 of the box member.

When removing the above member, first remove the box member or/and the pin member with the pressurized fluid.
The protrusion must be widened sufficiently to disengage from the groove, thus allowing axial movement of the member. During this initial stage of removal, when the protrusion and groove are contracted and/or expanded but not yet completely disengaged, the pressurized fluid is likely to leak out. If the amount of leakage of this pressurized fluid is considerable, the pressure of this pressurized fluid will drop to such an extent that the above-mentioned member cannot be removed. Furthermore, even if one of the members is susceptible to deformation, the member will not dislodge during expansion and/or contraction.

In order to prevent this problem, as shown in the figure, an annular protrusion 1 is provided at the end or shoulder of the inner circumferential surface 5 of the pin member.
Make 3 adjacent. This annular projection 13 projects axially in the direction of the free end of the pin member and overhangs the entire circumference of the end 10 of the outer circumferential surface 5 of the pin member.

The protruding portion 13 has a first end surface portion 14 extending generally flat in the radial direction, and a second end surface portion 15 facing generally inward in the radial direction, and this second end surface portion 15 is shown in FIGS. As shown, it has a substantially truncated conical shape, but is inclined on the opposite side of the conical surface of the inner circumferential surface 5. The free end of the box member is provided with a first flat end surface 16 extending generally radially outwardly and a second end surface 17 extending radially inwardly and generally radially outwardly. End face part
17 is an annular protrusion 1 at the free end of the box member.
It is in 8.

When all the above members are assembled as shown in FIG.
5 and 17 touch. If the pipe joint is to transmit axial forces, the first end surfaces 14, 16 are brought together under compressive stress, and the first end surfaces 14, 16 meet the protrusions of the surfaces 5, 6. Continued contact is maintained by making the dimensions of the recesses appropriate. Furthermore, the second end surface portion 1
5 and 17 are pressed together to form a face-to-face seal;
This seal works effectively when the pipe fitting is used and during the initial stages of disassembly. Its effect will be described later.

4 to 7 show other shapes of the second end surfaces 15, 17 of the pin member and box member.
The shape of this portion shown in FIG. 4 corresponds to the first end surface portion shown in FIGS. 1 to 3, and this end surface portion 15 is in the shape of a truncated cone, and the apex angle of the conical portion is approximately 30°. However, this is just one example, and it is preferable that this apex angle can be changed upon request. The second end face 17 has a rounded portion 17a which contacts the second end 15 when the above-mentioned components are completely assembled. This rounded portion 17a is connected to a cylindrical surface portion 17b and a radial end surface portion 19.
is axially spaced from the corresponding surface of the pin member. In the embodiment shown in FIG.
5 has the same shape as the second end surface portion 15 in FIG. The portion 17c is the end surface portion 1
The cone angle is smaller than 5, and this cone angle is, for example,
It is 15°. In the embodiment shown in FIG. 6, the rounded portion 17 has the same shape as in the embodiment of FIG. 4, but the second end face 15 has two frustoconical portions 15a, 15b. One of the truncated conical portions 15a comes into contact with the rounded portion 17a first when the pipe joint is assembled, and the conical angle of this truncated conical portion 15a is larger than the conical angle of the other truncated conical portion 15b. For example, in the truncated conical part 15a
45°, and 30° at the other truncated conical portion 15b. This shape of the end face portion 15 engages the members and performs three functions. The reason for this is that the projection 18 is subjected to less radial restraint at the free end of the box member with the rounded portion 17 and is therefore less deformed. In the embodiment shown in FIG. 7, the end faces 15, 17 are truncated cones with substantially the same cone angle, for example 30°, and the end face 17 has a radially oriented surface 19 through a rounded portion. Leads to.

The free ends of the pin members and the inner ends of the box members also have protrusions 13', 18' and first end surfaces 14', 1, as shown in FIGS.
6' and second end face portions 15', 17', each protrusion and each end portion 13' to 18' being a protrusion between the free end of the box member and the inner end of the pin member. 13, 18 and the first end surface portion 14,
16, corresponding to the second end face portions 15 and 17. However, the free end of the pin member has an end surface 1
4' is arranged so as not to contact the end face portion 16' when the pipe fitting is fully engaged. The end faces 15', 17' cooperate in exactly the same manner with the corresponding end faces 15, 17 at the free end of the box member and at the inner end of the pin member.

The end face portions 14 to 17 and 14' to 1
7' is arranged as described above, so that in the final step of telescopically engaging the pipe fitting, the end faces 15, 1
7 and end face portions 15' and 17' come into contact with each other.
The radial and axial forces between the end faces depend on the relative dimensions of the members and whether the abutting end faces need to be sealed. When the pipe joint is fully connected, the end faces 14 and 16 are connected, and this joint state can be visually confirmed from the outside of the joint. It can be used as an indicator of whether or not the engagement is sufficient.
Depending on the design of this member, pressurized fluid may
between these surfaces 5, 6, thereby causing an expansion of the box member and/or a contraction of the pin member. The protrusion 13 limits the expansion of the box member at the ends of the surfaces 5 and 6, and the protrusion 13' limits the contraction of the pin member 1,
By limiting this expansion and contraction, the end surface portion 15,
17 and 15', 17' forming contact increases the effectiveness of the seal provided. Since the projections 7 and grooves 8 of the surfaces 5 and 6 do not extend to the ends of the surfaces 5 and 6, the projections 13 and 13' limit the expansion at the ends of the surfaces 5 and 6 as described above. However, it is possible to expand the box member and/or contract the pin member to such an extent that the protrusion and groove are completely separated. If the protrusion 7 is moved out of the groove 8 due to the radial movement of the protrusion 7,
The box member 3 is removed from the pin member 1 and becomes movable in the axial direction. Initially, the end face parts 15, 17
A seal between the end face parts 15' and 17' is maintained based on the length and shape of these end face parts. It is maintained until it comes off from the groove part 8. Therefore, the pin member 1 is prevented from becoming detached from the box member 3 due to a decrease in the pressure of the pressurized fluid. When the pin member and the box member begin to move relative to each other in the radial and axial directions, the pin member and the box member move toward the end surface 1.
5, 17 and the end face portions 15', 17', it is also preferable that the shape is still sufficiently circular and can maintain a concentric state.

8 and 9 show an improved example of the embodiment shown in FIG. 6. In this embodiment, the end face portions 17a, 17
b has the same shape as the end face parts 17a and 17b in FIG. 6, and the rounded part 17a is the cylindrical part 1.
Continuing from 7b. The end surface portion 15 of this embodiment is
As in the embodiment shown in FIG. 6, it has a generally truncated conical first portion and a cylindrical second portion 15d. Since the diameter of the end surface portion 17b of the protruding portion 18 of the box member is slightly larger than the diameter of the end surface portion 15d of the pin member, when the pin member and the box member are connected, the end surface portion 17a first contacts the end surface portion 15a. When the protruding portion 18 contacts the end surface portion 17b and the end surface portion 15a, the protruding portion 18 will contact the end surface portion 17b and the end surface portion 15a.
Bend until a touches. This is advantageous in this embodiment, as it allows very precise control of the protrusion 18 by constraining its radial movement and radially deflecting the protrusion 18. Can be done. This suppression and deviation of the protruding portion is achieved by making the dimensions of the end surface portion 17b and the end surface portion 15d relative to each other. The axial force required to move the pin member and box member to a position where they are fully engaged while maintaining the seal between the end face portions 17b and 15d when the box members are fully engaged. can be reduced to the point where it is minimized.

During the removal of the pin member from the box member, pressurized fluid is introduced into the surfaces around the members to inflate the box member and/or contract the pin member, at the initial stage of the member. While the expansion and/or contraction of
The end surface portion 17b is firmly pressed against the end surface portion 15d, thereby increasing its sealing effect. Of course, the end surface portion 17b is kept sufficiently circular by the end surface portion 15d. Contact between end member 17b and end member 15d is maintained even when this member initially begins to move slightly in the axial direction, and this contact causes the top surface of the projection to fit into the groove between the grooves. Then, due to the axial movement between the two end surfaces, the end surface 17a comes into contact with the end surface 15a, thereby maintaining the seal between the two end surfaces 15 and 17.

As in the embodiments already described, in the embodiments of FIGS. 8 and 9, the protrusions 13',
18' at the free end of said pin member and at the inner end of said box member at faces 14', 15', 16', 17', and faces 15' and 17' correspond identically at faces 15, 17. surface 14' and surface 16' may not be in contact with each other.

In the embodiments described above, the protrusion of the pin member is integrally formed with the body of the pin member. In the improvement shown in FIG. 10, the protrusion 13 of the pin member
is an annular member 20 that separates the annular member 20.
may be placed in a suitably shaped recess at the inner end of the pin member, and the annular member 20 may be shrink-fitted into this groove, for example. Similarly, the annular member 2 which also separates the protrusion 13' of the box member
0', and the annular member 20 is engaged with the inner end of the peripheral surface 6 of this member. As shown in FIG. 10, surfaces 15 and 17 are similar to surfaces 15 and 1 of the embodiment of FIG.
However, it is preferable to apply the improvement shown in FIG. 10 to all the embodiments described above.

In order to improve the seal between surfaces 15 and 17 when the pin member and box member are uncoupled, i.e., to seal the unsealed surfaces when the pin member and box member are fully connected. To facilitate this, an annular clamp 21, shown diagrammatically in FIG. It is also possible to prevent deflection. This clamp 21 is preferably used in any of the above embodiments.

To seal between the pin member and the box member of a joint used under conditions where internal pressure and external pressure are applied, and to seal the edges of the surfaces around the two members in the initial stage of uncoupling of the two members. A sealing device may be provided for sealing purposes. However, if this seal is
When the seal is formed by contact between the end surfaces 15' and 17', this seal is weakened. That is, when there is a request to add another seal. For example, as shown in FIGS. 8 and 9, a compressible annular member 40 having elasticity is provided at the bottom of the recess 41.
1 is provided between the protrusion 13 of the pin member and the main body, and the free end of the box member is engaged with the recess 41 as shown in FIG. A similarly resilient compressible seal member 40' is provided at the other end of the periphery of the pin member and is used to connect the free end of the pin member to the box member. The sealing members 40, 40' are shown in FIGS. 4 to 7.
Although it can be provided in any of the embodiments shown in the figure, in the case of FIGS.
As shown in the figure, the end surface 19 (or 1
9') is rounded, thereby improving sealing performance by contact with the seal 40 (or 40').

Instead of doing this, Figures 11 and 12
As shown in the figure, the protrusion 1 on the surface 12 of the box member
A radially inner protrusion 43 is provided at the portion 8, and when the pin member and box member are fully connected, the first
As shown in FIG. 2, this protrusion 43 is brought into contact with the surface 10 of the pin member. The surface 10 is cylindrical, and the minimum diameter of the top of the protrusion 43 is smaller than the diameter of the surface 10 in order to ensure sufficient contact. The contact between the protrusion 43 and the surface 10 naturally has an effect on the engagement with the end surfaces 15 and 17;
5 and 17 are brought into contact. As shown in FIGS. 11 and 12, the surface 1 is
5 and 17 are joined in the same way as in the embodiments of FIGS. 8 and 9, and the diameter of the cylindrical surface 17b is preferably smaller than the diameter of the surface 15d;
The radial thickness between surface 7b and the top of projection 43 is greater than the radial distance between surface 10 and surface 15d, so that surface 17b and surface 15d are connected when the pin member and box member are fully joined. 15 is pressed until contact is made. The surface 9 of the free end of the pin member is provided with a radial spherical projection 43' in the same manner as described above;
The protrusion 43' is connected to the surface 11 of the inner end of the box member.
It is preferable to press fit it into.

The embodiment shown in FIG. 13 corresponds to the embodiments shown in FIGS. 11 and 12, but the differences are as follows.
In this embodiment, the frustoconical surfaces 15a and 15a' shown in FIGS. 11 and 12 are replaced with rounded surfaces 15e,
The reason is that it was changed to 15e'. The advantage of this roundness is that the surface 15e of the protrusion 13 or 13'
Alternatively, the axial extent of 15e' can be smaller than the axial extent of the surface 15a or 15a' of the projection, so that the axial extent of the projection 13 or 13' and the annular projection 18 or 18', that is, the end face portions 15d, 17
b, or the axial range of the contact portion between 15a' and 17b'. The end surface portion 15e or 15e' continues from the end surface portion 15d or 15d and the end surface portion 14 or 14', and this end surface portion 15e
Or, the radius of curvature of the curved surface of 15e' is larger than the radius of curvature of the curved surface of the end face part 17b or 17b' of the box member and the end face part 16 or 16', so that when the pin member and the box member are sufficiently connected, the end face part Interference between the portions 15e and 15e' can be reliably prevented. What can be seen here is that in the final stage of coupling the pin member and box member, the tops of the protrusions are forced to cover the surfaces between adjacent grooves, and the grooves allow each protrusion to The pin member and the box member are forcibly deformed and inserted into the protrusion and grooves 5 and 6 at the joining location. The annular projection 18 of the box member is not affected by the method described above. This radial deformation of the box member therefore has the effect of causing the annular projection 18 to taper outwardly of the box member into a slightly frustoconical shape. This radial deformation of the box member serves to connect the annular member 18 to the recess between the projection 13 and the body of the pin member. Therefore, the drawing surfaces 15a, 15
The need to widen e is reduced. As shown, a radial seal 43 is formed and the annular projection 18 of the box member and the faces 10, 1 of the pin member
The radial dimension of 5d has the same relationship as explained in FIGS. 11 and 12. However, it is convenient that the end 15e or 15
The shape of e' can be applied as is to FIGS. 6, 8 and 9, in which case the surface 15a or 15a' is changed to a rounded surface 15e or 15e'.

In the case where there are no seals on surfaces 9, 11 and 10, 12, or where the surfaces are slightly separated when the pin member and box member are fully connected, the portion adjacent to the protrusion 18 of the box member. For example, the radial thickness of
This makes it easier for the protrusion 18 to bend when the pin member and box member are attached and detached. Advantageously, this feature can be directly applied to the other embodiments described herein and is also applied to the protrusion 18' of the free end of the pin member in all the embodiments described above. be able to.

The pin members and box members 1 and 3 described above can be provided integrally with the end of the tube, or can be provided in a separable form with the end of the tube, or can be provided directly with the end of the tube. It can also be fixed directly or indirectly.

In the case of direct fixation, the member may be welded to the tube end, for example. In the case of indirect fixation, for example, a pipe joint of the same type or a different type is used, and the above-mentioned pin member and/or
It is also possible to connect the box parts. For example, as shown in FIG.
The pin member 1 is integrally formed at the end of the box member 3, and the pin member 1 is connected to the box member 3. This box member 3 is formed integrally with a pipe fitting as described in the above-cited specification of British Patent No. 1,573,945. The pipe fitting described in this British patent specification does not allow for removal. Box member 24 is permanently coupled to pin member 25, which box member 25 is connected to tube portion 26.
is integrally formed at the end of the Alternatively, the fitting having the box member 24 and the pin member 25 may be made non-removable, and for example the pin member and the box member 1,3
It can also be made of the same type as a joint with.

In all of the embodiments described above, the end surfaces 14, 16 of the inner circumferential end of the pin member and the free end of the box member are joined together when the two members are fully joined, and the end surfaces 14', 16' are axially spaced apart. If it is required to apply a compressive force in the axial direction when the above-mentioned two members are fully connected, all the above-mentioned embodiments may be applied to the inner circumferential end of the box member and the pin member. The end surfaces 14', 16' of the free ends are in contact and the ends 14, 16 are in contact with each other.
It is preferable to improve the structure so that they are spaced apart in the axial direction.

The components of the above-mentioned pipe fittings can be made of high tensile strength steel, for example.

[Brief explanation of the drawing]

1 and 2 are partial axial cross-sectional views of a pin member and a box member according to an embodiment of the present invention,
FIG. 3 is a partial axial cross-sectional view of the corresponding part of the member shown in FIGS. 1 and 2, and FIGS. 4 to 13 are partial axial cross-sectional diagrams of examples of improved pin members and box members. , FIG. 14 is an axial cross-sectional diagram of a joint according to the present invention coupled to a pipe. 1... Pin member, 3... Box member, 5...
Outer circumferential surface of pin member, 6... Inner circumferential surface of box member, 7... Protrusion, 8... Groove, 9, 10... End face of protrusion, 11, 12... End face of recess, 1
3, 13'...protrusion, 14, 14', 16, 1
6′...first end surface portion, 15, 15′, 17, 17′
...Second end surface portion, 15a...First portion, 15b,
15d...Second portion, 17a...Rounded portion, 17b...Cylindrical portion, 17c...Frustoconical portion, 18...Annular protrusion, 19...Radial end surface portion, 40, 40' ... Seal member, 43,4
3′...Annular protrusion.

Claims (1)

[Scope of Claims] 1. A pipe joint consisting of a tubular pin member 1 having a truncated conical outer circumferential surface 5 and a tubular box member 3 having a truncated conical inner circumferential surface 6, the outer circumferential surface 5 being connected to an outer shoulder. and an inner free end, and the inner peripheral surface 6
has an inner shoulder and an outer free end, the frustoconical inner circumferential surface 6 of the box member 3 corresponds to the outer circumferential surface 5 of the pin member 1, and the pin member 1 and the box member 3 are connected to each other. When fully fitted together, the inner circumferential surface 6 and the outer circumferential surface 5 overlap, and the inner circumferential surface 6 and the outer circumferential surface 5 have protrusions 7 and grooves 8, respectively, and the pin member 1 and the box member 3 are connected to each other. When fitted, the protrusion 7 and the groove 8 engage with each other, and the pin member 1 and box member 3 are fixed in the axial direction, and when the pin member 1 and box member 3 are uncoupled, the inner peripheral surface 6 and the outer peripheral surface 5, the pin member 1 and the box member 3 have the outer peripheral surface 5,
It has an annular projection 13; 13' extending around the shoulder of the inner circumferential surface 6 and projecting in the direction of the free ends of the pin member 1 and the box member 3, and these projections 13; 13' are generally The box has an annular first end surface 14; 14' extending flat in the radial direction and an annular second end surface 15; 15' facing generally radially and facing the outer peripheral surface 5 and the inner peripheral surface 6. The free end portions of the member 3 and pin member 1 extend generally flatly, and have an annular first end surface portion 1 that contacts the first end surface portion 14; 14' when the box member 3 and pin member 1 are fitted.
6; a second end face portion 17 facing generally radially with 16′ and contacting the second end face portion 15; 15′ of the protruding portion 13; 17', and when the pin member 1 and the box member 3 are fully fitted, the second end face part 15; 15' and the second end face part 17; 2 end face part 1
7; 17' is provided in the annular part 18; 18' at the free end of the box member 3 and the pin member 1, and while the pin member 1 is being attached and removed from the box member 3, the annular part 18; A pipe joint characterized by being able to bend. 2. The second end surface 15 of the pin member 1 is generally frustoconical, and the second end surface 15 extends in a direction opposite to the frustoconical surface of the pin member 1. The pipe fitting described in item 1. 3 The second end surface portion 15 of the pin member 1 has a truncated conical first portion 15a and a truncated conical second portion 15b.
The second portion 15b is the first portion 15.
a, and the cone angle of this second portion is smaller than the cone angle of the truncated cone.
The pipe joint according to item 1 or 2. 4 The second end portion 15 of the pin member 1 has a first portion 15a having a truncated conical shape and a second portion 15 having a generally cylindrical shape.
d, and the second portion 15d is located closer to the outer circumferential surface 5 than the truncated conical first portion. Pipe fittings listed. 5 The second end surface portion 15 of the pin member 1 has a rounded first portion 15e on the outside in the radial direction, and this first portion 15e is connected to a generally cylindrical second portion 15d, and this second portion 15d is Claims 1 to 3 are characterized in that the portion is located closer to the outer circumferential surface 5 than the rounded first portion 15e.
Pipe fittings described in any of the following paragraphs. 6. The second end surface portion 17 of the box member 3 is a rounded portion 17a, and this portion 17a is prevented from coming into contact with the second end surface portion 15 when the pin member 1 and the box member 3 are engaged. A pipe joint according to any one of claims 1 to 5. 7. The second end surface portion 17 of the box member 3 has a rounded portion 17a, and this portion 17a becomes the second end surface portion of the pin member 1 when the pin member 1 and the box member 3 are fully engaged. Claim 2 or 3, characterized in that it touches 15.
Pipe fittings listed in section. 8. The second end surface portion 17 of the box member 3 has a rounded portion 17a, and this portion 17a forms the second end surface portion 15 of the pin member 1 when the pin member 1 and the box member 3 are fully engaged. second part 1 of
5b. The pipe joint according to claim 3, wherein the pipe joint contacts the pipe joint 5b. 9 The second end surface portion 17 of the box member 3 has a cylindrical portion 17b, and the cylindrical portion 17b
is connected to the rounded portion 17a, and the rounded surface of the rounded portion 17a faces towards the first end face portion 16. The pipe joint according to any one of items 8 to 8. 10 The second end portion 17 of the box member 3 has a truncated conical portion 17c, this portion 17c is coupled to the rounded portion 17a, and the rounded portion 17a is connected to the first end portion 16. The pipe joint according to any one of claims 6 to 8, characterized in that the pipe joint continues from . 11 The second end surface portion 17 of the box member 3 is generally shaped like a truncated cone, and the cone angle of the second end surface portion 17 is the same as the cone angle of the second end surface portion 15 of the pin member 1. A pipe joint according to claim 1. 12 The second end portion 17 of the box member 3 has a cylindrical portion 17b, and this portion 17b continues the rounded portion 17 to the first end portion 16.
a, and the second end face portion 1 of the box member 3
The side of the cylindrical portion 17b of No. 7 comes into contact with the cylindrical portion 15d of the second end surface portion 15 of the pin member 1 when the pin member 1 and the box member 3 are fully engaged. A pipe joint according to claim 6. 13. The first end surface portions 14, 16 of the pin member 1 and the box member 3 are press-fitted together when the members are fully engaged. Pipe fittings listed in section. 14. Any one of claims 1 to 13, characterized in that the second end surfaces 15, 17 of the pin member 1 and box member 3 are press-fitted when the members are fully engaged. Pipe fittings listed in section. 15. A patent claim characterized in that the second end surface portion 17 of the box member 3 is provided in an annular portion of the free end portion of the box member 3, and the second end surface portion 17 can be bent in the radial direction during attachment and detachment. range 1
The pipe joint according to any one of Items 1 to 14. 16. The method according to claim 15, characterized in that the thickness 44 of the box member 3 is reduced within the range of the annular portion 18 of the box member 3, thereby causing the annular portion to flex. pipe fittings. 17 The first end surface portion and the second end surface portion 14,1
5, 16, and 17, there are no protrusions or grooves on the outer circumferential surface 5 and inner circumferential surface 6 of the pin member 1 and the box member 3, and the outer circumferential surface 5 and inner circumferential surface 6
A pipe joint according to any one of claims 1 to 16, characterized in that when the pin member 1 and box member 3 are fully engaged, they separate in the radial direction. 18. The pipe joint according to any one of claims 1 to 17, characterized in that a sealing device for sealing is provided between the pin member 1 and the box member 3. 19 The sealing device has a resilient and compressible annular member 40, which is disposed in a recess between the protrusion 13 of the pin member 1 and the main body of the pin member 1. A tube according to claim 18, characterized in that the annular member 40 is engageable by the free end of the box member 3 when the pin member 1 and the box member 3 are fully engaged. Fittings. 20. Claim 18, wherein the sealing device has an annular radially protruding protrusion 43, which is press-fitted into the inner circumferential surface 6 of the box member 3. Pipe fittings described in . 21 The annular protrusion 43 protruding in the radial direction is provided within the range of the second end face 17 of the inner peripheral surface 6 of the box member 3; 21. The pipe joint according to claim 20, wherein the pipe joint is pressed until it contacts the second end surface portion 15 of the pin member 1. 22. Any one of claims 1 to 21, characterized in that the radial outer edges of the first end surfaces 14, 16 of the pin member 1 and box member 3 are visible from outside the main pipe joint. Pipe fittings listed in section. 23 A protrusion 13' corresponding to the protrusion 13 of the pin member 1 is provided on the shoulder of the box member 3, this protrusion 13' having a second end face 15' facing in the radial direction; The second end surface portion 15' corresponds to the second end surface portion 15 of the pin member 1, and the free end portion of the pin member 1 corresponds to the second end surface portion 1 facing in the radial direction.
7', the second end surface 17' corresponds to the second end surface 17 of the free end of the box member 3, and the protrusion 13' of the box member 3 and the free end of the pin member 1. has first end surface portions 14', 16', which are provided at the protruding portion of the pin member 1 and at the free end portion of the box member 3. , 16, but
Claims 1 to 2 are characterized in that the first end surfaces 14' and 16' do not come into contact when the pin member 1 and box member 3 are fully engaged.
Pipe fittings described in any of Section 2. 24. The pipe joint according to claim 23, further comprising sealing devices 40' and 43' for sealing between the pin member 1 and box member 3. 25. The sealing device comprises a resilient and compressible annular member 40', which is arranged in a recess between the protrusion 13' of the box member 3 and the body of the box member 3. 23. A pipe joint according to claim 22, characterized in that the annular member 40' is engaged by the free end of the pin member 1. 26 The sealing device has an annular projection 4 in the radial direction.
3', and this annular protrusion 43' is connected to the free end of the pin member 1 and the inner circumferential surface 6 of the box member 3.
25. The pipe joint according to claim 24, wherein the annular projection 43' is press-fitted into the inner peripheral surface 6 of the box member 3.