JP2013210033A - Pipe end receiving socket, and method for inserting and connecting cylindrical pipe into the socket - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a pipe end receiving socket capable of achieving the sealed engagement to a cylindrical pipe in an aligned condition while the friction with the cylindrical pipe with a seal ring inserted therein is reduced.SOLUTION: A pipe end receiving socket 10 includes: a cylindrical socket body 14 having a first inner circumferential surface part 12-3 in which an inner circumferential surface has the inside diameter adjacent to an outer circumferential surface of an inserted cylindrical pipe P, a radial direction face part 12-4, and a second inner circumferential face part 12-5; a seal ring 16 adjacent to the radial direction face part 12-4; a seal ring displacement member 18 provided in contact with the seal ring; and a seal ring operation member 20 which displaces the seal ring displacement member in the direction of the seal ring, pushes out the seal ring inwardly in the radial direction, and achieves the sealed engagement with an outer circumferential surface of the cylindrical pipe.

Description

  The present invention relates to a tube end receiving socket for receiving and holding and fixing an end portion of a tube, and a method for inserting and connecting a cylindrical tube to the tube end receiving socket.

  A normal pipe joint consists of a male joint and a female joint that are attached to the ends of two pipes to be joined by screw connection, etc., and the two pipes are connected by inserting and connecting the male joint to the female joint. It is supposed to be. On the other hand, it is composed of only a female joint member in which one pipe is connected by a screw or the like, and the other pipe is inserted into this female joint member to connect the two pipes. There is also a pipe joint (patent document 1).

  This type of pipe joint is provided with a seal ring having a portion that protrudes slightly inward in the radial direction from its inner peripheral surface, and the pipe is inserted into the pipe joint while sliding with the inner peripheral surface of the seal ring. The outer peripheral surface of the pipe and the inner peripheral surface of the pipe joint are sealingly engaged by this seal ring.

Japanese Utility Model Sho 61-112194

  In the pipe joint of the type disclosed in Patent Document 1, the pipe to be inserted and connected has the following problems because it is manufactured with a certain tolerance.

  Since the seal ring is set to have a constant inner diameter, even when the inserted tube is manufactured within the required tolerance, when the diameter is large, when it is inserted into the pipe joint, it is smaller Friction of the seal ring is large and wear of the seal ring is likely to occur. On the other hand, when the diameter of the tube is small, there is a possibility that sufficient sealing cannot be obtained because the sealing engagement force with the seal ring is small.

  Further, it is necessary to chamfer the outer peripheral edge of the tube tip in order to reduce damage to the seal ring during tube insertion.

  Further, since the inner diameter of the pipe joint that receives the pipe is determined in consideration of the tolerance of the outer diameter of the pipe, there is a certain amount between the outer circumference of the inserted pipe and the inner circumference of the pipe joint. As a result, the inserted pipe is slightly inclined with respect to the pipe joint, and therefore the sealing force of the seal ring on the outer peripheral surface of the pipe becomes non-uniform.

  The present invention has been made in view of the above points. When a tube is inserted, friction with respect to the seal ring by the tube is reduced, and after the tube is inserted, the seal ring is pressed against the outer peripheral surface of the tube. The object is to enable the pressure to be sufficient and uniform.

  In addition, this invention is not necessarily applied only to the pipe joint which connects two pipes. For example, the present invention can be applied to an end cap for releasably sealing the open ends of several pipes generated in a pipe constituted by connecting a plurality of pipes.

That is, the present invention
A cylindrical socket body that has one end and the other end and receives and holds a cylindrical tube inserted from the one end toward the other end, and is inserted from the one end at a position between the one end and the other end. A first inner peripheral surface portion having an inner diameter adjacent to the outer peripheral surface of the cylindrical tube, an annular radial surface portion extending radially outward from the first inner peripheral surface portion, and a radially outer side of the radial surface portion A cylindrical socket body having a second inner peripheral surface portion extending from the edge toward the other end;
A seal ring set radially inward of the second inner peripheral surface portion adjacent to the radial surface portion;
An annular seal ring displacing member set adjacent to the seal ring on the other end side of the seal ring, having an end surface facing the one end, and as the end surface goes radially inward, A seal ring displacement member provided as an inclined surface inclined to the other end side so as to be in contact with the seal ring;
The cylindrical socket main body is displaceably attached, and is manually displaced with respect to the cylindrical socket main body, whereby the seal ring displacement member is displaced toward the one end to form the inclined surface. A seal ring operating member whose end face advances toward the radial surface portion and pushes the seal ring radially inward to sealingly engage the outer peripheral surface of the cylindrical tube;
A tube end receiving socket is provided.

  With this tube end receiving socket, the configuration as described above makes it possible to set the cylindrical tube so that it does not substantially rub against the seal ring when the cylindrical tube is received in the socket. It is possible to eliminate damage to the seal ring due to friction with the tube, and therefore it is not necessary to chamfer the end edge of the cylindrical tube in order to eliminate the damage.

  The seal ring operating member can be manually operated. Specifically, the seal ring operating member extends in the radial direction of the cylindrical socket body, one end is connected to the seal ring displacement member, and the other end is An operating rod extending outside the cylindrical socket body can be provided, and the seal ring displacing member can be displaced toward the one end from the outside of the cylindrical socket body via the operating rod.

More specifically,
The seal ring operating member has an outer operating cylinder attached to the outer peripheral surface of the cylindrical socket body and connected to the operating rod, and the operating cylinder is displaced in the longitudinal axis direction of the cylindrical socket body. Thus, the seal ring displacement member can be displaced.

In the above example,
A seal ring operating spring for biasing the seal ring operating member in the direction of the one end of the cylindrical socket body;
Locking means for locking the seal ring operating member against the biasing force of the seal ring operating spring;
Have
By manually releasing the locking of the seal ring operating member by the locking means, the seal ring operating member is displaced toward the one end of the cylindrical socket body, whereby the seal ring displacement The member can be displaced in the longitudinal axis direction of the cylindrical socket body, and the seal ring can be displaced radially inward.

  In this case, the locking means has a hole provided so as to penetrate the cylindrical socket main body in the radial direction, the hole extending in the circumferential direction, and the cylindrical portion extending from the locking part. A release portion extending in a direction toward the one end of the socket body, and the operating rod of the seal ring operating member urged by the seal ring operating spring is positioned in the engaging portion to disengage the engaging portion. It is locked by the demarcating side wall, and is disengaged from the locking portion and positioned in the release portion, thereby being displaced toward the one end of the cylindrical socket body along the release portion. Can do.

In the tube end receiving socket having the above-described configuration,
The cylindrical socket main body has a pair of the same inclination angles sequentially provided in the longitudinal axis direction on the inner peripheral surface of the cylindrical socket main body extending from the one end of the cylindrical socket main body to the first inner peripheral surface portion. Having an inclined centering surface of the same size and gradually inward in the radial direction in the direction toward the one end of the cylindrical socket body;
The tube end receiving socket is further
A cylindrical holding member which is set concentrically with respect to the cylindrical socket body inside the cylindrical socket body and is set to be displaceable in the longitudinal axis direction of the cylindrical socket body, and the inserted cylinder A cylindrical holding member having an inner diameter adjacent to the outer peripheral surface of the tube;
A pair of centering means provided on the cylindrical holding member at intervals in the longitudinal axis direction of the cylindrical holding member corresponding to each of the inclined centering surfaces, each centering means being A plurality of centering members that are provided at intervals around the longitudinal axis of the cylindrical holding member and are displaceable in the radial direction; A pair of centering means, each of which has the same positional relationship in the longitudinal axis direction of the cylindrical holding member with the corresponding inclined centering surface;
Have
When the cylindrical tube is inserted into the cylindrical socket main body, the cylindrical holding member is displaced in the one end direction of the cylindrical socket main body, whereby a plurality of the centering members of the centering means are arranged. A plurality of centering members of the centering means are sandwiched between the outer surface of the cylindrical tube and the corresponding inclined centering surface, and each of the centering members is held in the cylindrical shape with respect to the outer surface of the cylindrical tube. The cylindrical tube can be centered with respect to the cylindrical socket body by contacting and pressing the outer peripheral surface at the same position in the radial direction of the member.

  By doing so, the pair of centering means set at positions separated from each other in the longitudinal axis direction of the cylindrical socket body come into contact at the same position in the radial direction and press the cylindrical tube inward in the radial direction. The cylindrical tube is centered so as to be parallel to the longitudinal axis. Therefore, the sealing by the seal ring becomes uniform.

In particular,
A centering spring that biases the cylindrical holding member toward the one end of the cylindrical socket body;
Cylindrical holding member locking means for locking the cylindrical holding member against the urging force of the centering spring;
After the cylindrical tube is inserted into the cylindrical socket body, the cylindrical holding member is unlocked by the cylindrical holding member locking means, and the cylindrical holding member is moved to the cylindrical shape. The centering can be performed by allowing the socket body to be displaced in the one end direction.

More specifically,
The cylindrical holding member locking means is
A locking cylinder that is displaceably provided on the outer surface of the cylindrical socket body and is connected to the cylindrical holding member;
A locking groove formed in the locking cylinder, the locking groove part extending in the circumferential direction of the cylindrical socket body, and a release groove part extending in the longitudinal axis direction from the locking groove part,
The locking groove is engaged with a locking protrusion provided so as to protrude from the outer surface of the cylindrical socket body, and the locking cylinder is held against the bias of the centering spring, It is possible to release the engagement against the centering spring of the locking cylinder by releasing the engagement of the locking protrusion with the locking groove and allowing the displacement in the releasing groove. .

In the pipe end receiving socket having the above-described configuration,
The seal ring is an O-ring,
The centering member may be a spherical member set so that a part thereof is embedded in the outer surface of the cylindrical holding member.

  Moreover, in the above-described tube end receiving socket, the inner diameter before the seal ring is displaced radially inward by the seal ring displacing member can be larger than the inner diameter of the first circumferential surface portion. . By doing so, the seal ring does not come into contact with the cylindrical tube and receive friction when the cylindrical tube is inserted, and therefore, wear of the seal ring can be greatly reduced.

The present invention also provides
A cylindrical socket body having one end and the other end for receiving and holding a cylindrical tube inserted from the one end toward the other end, and a cylinder received by being attached to the inner peripheral surface of the cylindrical socket body In a method of inserting and sealingly connecting a cylindrical tube to a tube end receiving socket comprising a seal ring for sealing between the outer peripheral surface of the tube and the inner peripheral surface of the cylindrical socket body,
Providing a seal ring displacement member for pushing the seal ring radially inward;
The cylindrical tube is inserted from the one end to the other end of the cylindrical socket body,
After the cylindrical tube is inserted into the cylindrical socket body, the seal ring is manually operated to displace the entire seal ring radially inward, and the seal ring is pressed against the outer peripheral surface of the cylindrical tube for sealing. Provided is a method for inserting and connecting a cylindrical tube characterized by being engaged with a tube end receiving socket.

  Hereinafter, an embodiment in which a tube end receiving socket according to the present invention is applied to a tube end sealing cap will be described with reference to the accompanying drawings.

It is a side view of the tube end receiving socket according to the present invention when applied to a tube end sealing cap that seals the end of the tube, and the upper half portion is shown in cross section to show the state before receiving the tube It is. FIG. 2 is a cross-sectional view of the upper half of the tube end receiving socket for showing the tube end receiving socket of FIG. 1 receiving a tube, sealing the periphery of the tube with a seal ring, and centering the tube with respect to the socket; is there. It is the top view which looked at the pipe end receiving socket from the top when the pipe end receiving socket is in FIG. It is the top view which looked at the pipe end receiving socket from the top when the pipe end receiving socket is in FIG.

  As shown in FIG. 1, the pipe end receiving socket 10 according to the present invention has a cylindrical socket body 14 provided with a pipe receiving hole 12 penetrating from the right end 12-1 to the left end 12-2. On the peripheral wall of the tube receiving hole 12, a first inner peripheral surface portion 12-3 adjacent to the outer peripheral surface P1 of the inserted cylindrical tube P and an intermediate portion between the first inner peripheral surface portion 12 and the intermediate position between the left and right ends. -3, an annular radial surface portion 12-4 extending radially outward from the radial direction, and a second inner peripheral surface portion 12-5 extending leftward from the radially outer edge of the radial surface portion 12-4. Have.

  In the cylindrical socket body 14, a seal ring (O-ring in the illustrated example) 16 that is set on the radially inner side of the second inner peripheral surface portion 12-5 adjacent to the radial surface portion 12-4, An annular seal ring displacement member 18 adjacent to the left side of the seal ring 16 and a seal ring operation member 20 for manually displacing the seal ring displacement member 18 in the longitudinal axis direction of the cylindrical socket body 14 are provided.

  The seal ring displacement member 18 has an end surface 18-1 facing the seal ring 16, and the end surface is an inclined surface inclined leftward as it goes radially inward, and the outer peripheral surface 18-2 has a second inner peripheral surface. It slides on the surface portion 12-5. In the illustrated example, the seal ring 16 has an outer diameter so as to contact the second inner peripheral surface portion 12-5, and the inner diameter is substantially equal to or larger than the first inner peripheral surface portion 12-3. It has an inner diameter, and when the cylindrical tube P is inserted, the outer peripheral surface P1 is hardly contacted by friction.

  The seal ring operating member 20 is formed integrally with the seal ring displacement member 18 and has a third inner periphery having an inner diameter larger than the second inner peripheral surface portion 12-5 of the tube receiving hole 12 of the cylindrical socket body 14. An operation rod 20-having an inner operation cylinder 20-1 slidable on the surface portion 12-6 and an other end extending from the one end connected to the inner operation cylinder 20-1 to the outside of the cylindrical socket body 14. 2 and an outer operation cylinder 20-3 slidably attached to the outer peripheral surface 14-1 of the cylindrical socket body 14 and connected to the operation rod 20-2. By displacing the cylindrical socket body 14 in the longitudinal axis direction, the seal ring displacement member 18 is displaced in the longitudinal axis direction. The seal ring operating member 20 resists the biasing force of the seal ring operating spring 20-4 and the seal ring operating spring 20-4 that biases the inner operating cylinder 20-1 to the right and the outer operating cylinder 20-3. The outer operation cylinder 20-3 has a locking means 20-5 (FIG. 3) to be locked by manually releasing the locking of the outer operation cylinder 20-3 by the locking means 20-5. It is displaced to the right relative to the cylindrical socket body 14, whereby the inner operation cylinder 20-1 displaces the seal ring displacement member 18 to the right and displaces the seal ring 16 radially inward. It is like that. In the figure, reference numeral 20-7 denotes a retaining ring for tightening the operating rod 20-2 from the outside in the radial direction.

  Specifically, the locking means 20-5 has a hole 15 (FIGS. 3, 4, and 1) provided to penetrate the cylindrical socket body 14 in the radial direction. An operating rod 20-2 of the seal ring operating member 20 having a locking portion 15-1 extending in the direction and a releasing portion 15-2 extending rightward from the locking portion and biased by the seal ring operating spring. A side wall 14-2 positioned in the locking portion 15-1 and demarcating the locking portion 15-1 (in the illustrated example, a concave portion to the right provided at the end of the side wall 14-2). And is disengaged from the engaging portion 15-1 and positioned in the releasing portion 15-2, thereby being displaced rightward along the releasing portion 15-2 and moving the seal ring displacement member 18 to the right. The seal ring 16 is displaced inward in the radial direction.

  As shown in FIGS. 1 and 2, a pair of cylindrical socket bodies 14 are provided with a pair of portions provided sequentially in the longitudinal axis direction on the right side of the first inner peripheral surface portion 12-3 of the peripheral wall surface of the tube receiving hole 12 of the cylindrical socket body 14. There are inclined centering surfaces 22 and 22 of the same size at the same inclination angle, and gradually inclined radially inward in the direction toward the right end of the cylindrical socket body 14. Correspondingly, the tube end receiving socket 10 is set concentrically to the cylindrical socket body 14 inside the cylindrical socket body 14 and can be displaced in the longitudinal axis direction of the cylindrical socket body 14. A pair of centering provided on the cylindrical holding member 24 at intervals in the longitudinal axis direction of the cylindrical holding member 24 corresponding to each of the set cylindrical holding member 24 and the inclined centering surfaces 22 and 22. Means 26 and 26 are provided. Specifically, each centering means 26 is provided with at least three or more spherical centering centers provided at circumferential intervals around the longitudinal axis of the cylindrical holding member 24 so as to be displaceable in the radial direction. Each of the plurality of centering members 26-1 having the member 26-1 and forming the centering means has a positional relationship in the longitudinal axis direction of the cylindrical holding member 24 with the corresponding inclined centering surface 22. It is the same.

  When the cylindrical tube P is inserted into the cylindrical socket main body 14, the cylindrical holding member 24 is displaced to the right relative to the cylindrical socket main body 14, so that a plurality of centering means 26 are arranged. The centering member 26-1 is sandwiched between the outer surface P1 of the cylindrical tube P and the corresponding inclined centering surface 22, and a plurality of centering members 26-1 of each centering means 26 are respectively Centering the cylindrical tube P with respect to the cylindrical socket body 14 by pressing the cylindrical holding member 24 against the outer surface P1 at the same position in the radial direction of the cylindrical holding member 24 in contact with the outer peripheral surface P1. Is supposed to do. In the example shown in the figure, the right and left centering members 26-1 are shown as being aligned in the axial direction, but they can also be offset from each other in the circumferential direction. For example, a pair of centering members 26-1 of one centering means 26 are provided at positions opposing each other in the diametrical direction, and a centering member 26-1 of the other centering means 26 is a pair of centers of the one centering means 26. By providing a pair in a diameter direction perpendicular to the diameter direction of the centering member, a required centering function can be obtained, and the number of centering members can be reduced as compared with the case where the centering members are aligned in the axial direction. .

  Specifically, a centering spring 28 that urges the cylindrical holding member 24 to the right, and a cylindrical holding member locking that locks the cylindrical holding member 24 against the urging force of the centering spring. Means 30, and after the cylindrical tube P is inserted into the cylindrical socket body 14, the cylindrical holding member 24 is unlocked by releasing the cylindrical holding member 24 by the cylindrical holding member locking means 30. Is allowed to be displaced to the right relative to the cylindrical socket body 14, and the centering is performed.

  More specifically, the cylindrical holding member locking means 30 includes a locking cylinder 30-1 that is displaceably provided on the outer surface of the cylindrical socket body 14 and is connected to the cylindrical holding member 24. Locking groove 30-2 formed in the stopper cylinder 30-1 and the locking groove portion 30-3 are fixed to the outer surface of the cylindrical socket body 14 so as to protrude from the outer surface. A locking groove 30-2 extending in the circumferential direction of the locking cylinder 30-1, and the locking groove from the locking groove part in the longitudinal axis direction of the cylindrical socket body. The locking groove 30-3 engages with the locking protrusion 30-5 and holds the locking cylinder 30-1 against the biasing force of the centering spring 28. At the same time, the engagement of the locking projection 30-5 with the locking groove 30-3 is released, and the displacement at the release groove 30-4 is allowed, and the locking cylinder It is adapted to release the locking against the 0-1 of the centering spring.

  The illustrated embodiment shows an example in which the end receiving socket 10 according to the present invention is used as a tube end sealing cap as described above, and for this reason, at the left end of the tube receiving hole 12 of the cylindrical socket body 14. The closing member 32 for sealing the tube receiving hole is set by a holding ring 34. An O-ring 36 is set between the outer peripheral surface of the closing member 32 and the third inner peripheral surface portion 12-6 of the tube receiving hole 12. The seal ring operating spring 20-4 is set between the closing member 32 and the inner operating cylinder 20-1, and an annular groove formed on the outer peripheral surface is formed on the outer peripheral surface of the inner operating cylinder 20-1. A V-shaped seal ring 38 is set in 20-6 so that the V-shaped opening faces leftward.

  When the end of the cylindrical tube P is sealed by the tube end receiving socket 10 according to the present invention applied to the sealing cap, first, the end of the cylindrical tube P is inserted from the right side of the socket 10 and FIG. As shown in FIG. Next, the locking cylinder 30-1 is rotated around the cylindrical socket body 14 so that the locking projection 30-5 is detached from the locking groove 30-3 and enters the release groove 30-4. . As a result, the locking cylinder 30-1 is moved to the right A together with the cylindrical holding member 24, and the centering means 26, 26 correspond to the inclined centering surfaces 22, 22 and the outer surface of the cylindrical tube P, respectively. The cylindrical tube P is centered with respect to the tube end receiving socket 10. Next, the outer operation cylinder 20-3 is rotated around the cylindrical socket main body 14, and the operation rod 20-2 is moved from the locking portion 15-1 of the hole 15 into the release portion 15-2, so that the seal The operating rod 20-2 is moved to the right B along the release portion 15-2 by the ring operating spring 20-4 to move the seal ring displacing member 18 to the right, whereby the seal ring 16 is radially inward C So that it is sealingly engaged around the outer surface of the cylindrical tube P.

  As described above, the embodiment in which the tube end receiving socket according to the present invention is applied to the tube end sealing cap has been described. However, the present invention is not limited to this, for example, the cylindrical socket body described above at the right end. A pipe joint that connects two pipes by connecting a pipe other than the pipe may be used, and in this case, the above-described closing member is naturally not provided.

Tube receiving socket 10; tube receiving hole 12; right end 12-1; left end 12-2; first inner peripheral surface portion 12-3; radial surface portion 12-4; second inner peripheral surface portion 12-5; 3 inner peripheral surface portion 12-6; cylindrical socket body 14; outer peripheral surface 14-1; side wall 14-2; hole 15; locking portion 15-1; release portion 15-2; Seal ring displacement member 18; end surface 18-1; outer peripheral surface 18-2; seal ring operation member 20; inner operation cylinder 20-1; operation rod 20-2; outer operation cylinder 20-3; Locking means 20-5; annular groove 20-6; retaining ring 20-7; inclined centering surfaces 22, 22; cylindrical holding member 24; centering means 26, 26; centering member 26-1; Outlet spring 28; cylindrical holding member locking means 30; locking cylinder 30-1; locking groove 30-2 Locking groove 30-3; releasing groove 30-4; locking protrusion 30-5; closure member 32; retaining ring 34; O-ring 36; V-shaped seal ring 38; tubulars P; outer peripheral surface P1

Claims (12)

A cylindrical socket body that has one end and the other end and receives and holds a cylindrical tube inserted from the one end toward the other end, and is inserted from the one end at a position between the one end and the other end. A first inner peripheral surface portion having an inner diameter adjacent to the outer peripheral surface of the cylindrical tube, an annular radial surface portion extending radially outward from the first inner peripheral surface portion, and a radially outer side of the radial surface portion A cylindrical socket body having a second inner peripheral surface portion extending from the edge toward the other end;
A seal ring set radially inward of the second inner peripheral surface portion adjacent to the radial surface portion;
An annular seal ring displacing member set adjacent to the seal ring on the other end side of the seal ring, having an end surface facing the one end, and as the end surface goes radially inward, A seal ring displacement member provided as an inclined surface inclined to the other end side so as to be in contact with the seal ring;
Displaceably attached to the cylindrical socket body, the seal ring displacing member is displaced toward the one end, and the end surface formed as the inclined surface advances toward the radial surface portion to thereby move the seal ring. A seal ring operating member which is pushed inward in the radial direction and is sealingly engaged with the outer peripheral surface of the cylindrical tube;
A tube end receiving socket having:   The pipe end receiving socket according to claim 1, wherein the seal ring operating member is of a manual type.   The seal ring operating member has an operating rod extending in the radial direction of the cylindrical socket body, one end connected to the seal ring displacement member, and the other end extending outside the cylindrical socket body. 3. The tube end receiving socket according to claim 2, wherein the seal ring displacing member can be displaced toward the one end from the outside of the socket main body through the operation rod.   The seal ring operating member has an outer operating cylinder attached to the outer peripheral surface of the cylindrical socket body and connected to the operating rod, and the operating cylinder is displaced in the longitudinal axis direction of the cylindrical socket body. The pipe end receiving socket according to claim 3, wherein the seal ring displacing member is displaced by the above. A seal ring operating spring for biasing the seal ring operating member in the direction of the one end of the cylindrical socket body;
Locking means for locking the seal ring operating member against the biasing force of the seal ring operating spring;
Have
By manually releasing the locking of the seal ring operating member by the locking means, the seal ring operating member is displaced toward the one end of the cylindrical socket body, whereby the seal ring displacement The tube end receiving socket according to claim 3 or 4, wherein a member is displaced in a longitudinal axis direction of the cylindrical socket main body to displace the seal ring radially inward.   The locking means has a hole provided so as to penetrate through the cylindrical socket body in the radial direction, the hole extending in the circumferential direction, and the locking portion from the locking part of the cylindrical socket body. A release portion extending in a direction toward the one end, and the operation rod of the seal ring operation member biased by the seal ring operation spring is positioned in the engagement portion to define the engagement portion. 6. The device according to claim 5, wherein the cylindrical socket body is displaced toward the one end of the cylindrical socket body along the release portion by being locked by the side wall and being removed from the lock portion and positioned in the release portion. The tube end receiving socket as described. The cylindrical socket main body has a pair of the same inclination angles sequentially provided in the longitudinal axis direction on the inner peripheral surface of the cylindrical socket main body extending from the one end of the cylindrical socket main body to the first inner peripheral surface portion. Having an inclined centering surface of the same size and gradually inward in the radial direction in the direction toward the one end of the cylindrical socket body;
The tube end receiving socket is further
A cylindrical holding member which is set concentrically with respect to the cylindrical socket body inside the cylindrical socket body and is set to be displaceable in the longitudinal axis direction of the cylindrical socket body, and the inserted cylinder A cylindrical holding member having an inner diameter adjacent to the outer peripheral surface of the tube;
A pair of centering means provided on the cylindrical holding member at intervals in the longitudinal axis direction of the cylindrical holding member corresponding to each of the inclined centering surfaces, each centering means being A plurality of centering members provided at intervals around the longitudinal axis of the cylindrical holding member and displaceable in the radial direction; and the plurality of centering members constituting the centering means, A pair of centering means having the same positional relationship in the longitudinal axis direction of the cylindrical holding member with the corresponding inclined centering surface;
Have
When the cylindrical tube is inserted into the cylindrical socket main body, the cylindrical holding member is displaced in the one end direction of the cylindrical socket main body, whereby a plurality of the centering members of the centering means are arranged. A plurality of centering members of the centering means are sandwiched between the outer surface of the cylindrical tube and the corresponding inclined centering surface, and each of the centering members is held in the cylindrical shape with respect to the outer surface of the cylindrical tube. 7. The centering of the cylindrical tube with respect to the cylindrical socket body is performed by contacting and pressing the outer peripheral surface at the same position in the radial direction of the member. The tube end receiving socket as described. A centering spring that biases the cylindrical holding member toward the one end of the cylindrical socket body;
Cylindrical holding member locking means for locking the cylindrical holding member against the urging force of the centering spring;
After the cylindrical tube is inserted into the cylindrical socket body, the cylindrical holding member is unlocked by the cylindrical holding member locking means, and the cylindrical holding member is moved to the cylindrical shape. 8. The tube end receiving socket according to claim 7, wherein the socket body is allowed to be displaced in the one end direction and the centering is performed. The cylindrical holding member locking means is
A locking cylinder that is displaceably provided on the outer surface of the cylindrical socket body and is connected to the cylindrical holding member;
A locking groove formed in the locking cylinder, the locking groove part extending in the circumferential direction of the cylindrical socket body, and a release groove part extending in the longitudinal axis direction from the locking groove part,
The locking groove is engaged with a locking protrusion provided so as to protrude from the outer surface of the cylindrical socket body, and the locking cylinder is held against the bias of the centering spring, The engagement of the locking projection with the locking groove is released to allow the displacement in the release groove, and the locking against the centering spring of the locking cylinder is released. The pipe end receiving socket according to claim 8. The seal ring is an O-ring;
10. The tube end receiving device according to claim 7, wherein the centering member is a spherical member set so that a part thereof is embedded in an outer surface of the cylindrical holding member. socket.   The tube according to any one of claims 1 to 10, wherein an inner diameter of the seal ring before being displaced radially inward by the seal ring displacement member is set to be larger than an inner diameter of the first circumferential surface portion. End receiving socket. A cylindrical socket body having one end and the other end for receiving and holding a cylindrical tube inserted from the one end toward the other end, and a cylinder received by being attached to the inner peripheral surface of the cylindrical socket body In a method of inserting and connecting a cylindrical tube to a tube end receiving socket including a seal ring that seals between an outer peripheral surface of the tube and an inner peripheral surface of the cylindrical socket body,
Providing a seal ring displacement member for pushing the seal ring radially inward;
The cylindrical tube is inserted from the one end to the other end of the cylindrical socket body,
After the cylindrical tube is inserted into the cylindrical socket body, the seal ring is manually operated to displace the entire seal ring radially inward, and the seal ring is pressed against the outer peripheral surface of the cylindrical tube for sealing. A method of inserting and connecting a cylindrical tube to a tube end receiving socket, wherein the cylindrical tube is engaged.

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