JP2007162852A - Pipe joint - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce work manhours in separation and reconnection of piping. <P>SOLUTION: When two joint components Ma, Mb are placed in normal connection states by operating operation members 52A, 52B, a valve mechanism Va is opened so that both penetration passages 14 communicate with each other. When separating the passages, by breaking off both joint components Ma, Mb from each other by operation of the operation members 52A, 52B, the valve mechanism Va becomes a closed state, a connection end of each penetration passage 14 is blocked, and the penetration passages 14 are cut off. In this state, even if the joint components Ma, Mb are separated, leakage of fluid in the passage can be prevented. Accordingly, when carrying out connection/separation of the passages, a process of atmospheric discharge of the fluid in the passages, and a process of recharging the fluid into the passages are unnecessary. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a pipe joint used for piping for pneumatic equipment and hydraulic equipment, piping for refrigerant gas filling such as a cold air conditioner, and piping for water facilities such as water supply and hot water supply for houses.

In an air conditioner, a refrigerant gas is filled in a pipe piped between an indoor unit and an outdoor unit. However, for moving etc., the indoor unit side pipe and the outdoor unit side pipe are temporarily connected. When separating into two, first, the refrigerant gas filled in the piping is discharged into the atmosphere, and then the indoor unit side piping and the outdoor unit side piping are separated. In addition, what is described in patent document 1 is known as a pipe joint used for such piping for refrigerant | coolants.
JP-A-7-293760

Conventionally, before disconnecting the pipe, the fluid filled in the pipe must be released into the atmosphere, and after connecting the pipes, the pipe must be filled with fluid. There is a problem that the number of work processes increases.
The present invention has been completed based on the above-described circumstances, and an object thereof is to reduce the number of work steps when disconnecting and reconnecting piping.

  As means for achieving the above-mentioned object, the invention of claim 1 is characterized in that two joint components including a through passage that can be connected to a fluid flow path, and the two joint components are connected to each other. When the two coupling components are in a connected state, the displacement means for relative displacement between the two coupling components is in an open state, and the two joint components are in a detached state. It is characterized in that it is provided with a valve mechanism that closes the connecting end portions of the two through passages.

  According to a second aspect of the present invention, in any one of the first and second aspects, the joint structure may be relatively rotatable in the connection process of the two joint structures. It is characterized in that a confirmation ring is provided which is restricted in rotation by being sandwiched between the other joint component when the normal connection state is reached.

  According to a third aspect of the present invention, in the first or second aspect of the present invention, the valve mechanism includes a metal valve body that is reciprocally movable, and a taper that is inclined with respect to a moving direction of the valve body. A metal valve seat having a shape, and the valve body includes a seat surface that can come into surface contact with the valve seat in a closed state, and a seal ring that can make elastic contact with the valve seat And is provided with features.

  The invention according to claim 4 is the one according to any one of claims 1 to 3, wherein the two joint components are made of metal, and the tip surface of any one of the joint components is provided with the A ring-shaped seal protrusion is formed which is hermetically contacted by biting into the tip surface of the other joint component in a state where the two joint components are connected. A seal member is attached to the surface, and a cylindrical valve body whose inner periphery forms part of the through-passage is provided, and the two joint components are properly connected to open the valve mechanism. In this state, the front end surface of the seal member is in elastic contact with a region on the inner peripheral side with respect to the seal protrusion on the front end surface of the one joint component, and the outer peripheral edge of the seal member is Inner circumference of seal protrusion Characterized in was configured to face or abut close relative.

  According to a fifth aspect of the present invention, in any one of the first to fourth aspects, at least one of the two joint components is connected to a metal pipe constituting the flow path. A pipe connection mechanism is provided, and the pipe connection mechanism includes a cylindrical joint body that allows insertion of the pipe, a cylindrical fastening member that is screwed into the joint body, and the joint body. A metal fastening ring that has a cylindrical shape surrounding the pipe inserted into the pipe and a tapered surface that is inclined with respect to the pipe insertion direction, and the fastening ring as the fastening member is screwed. In a form in which the fastening ring bites into the loosely regulated state and / or tightly adheres to the outer periphery of the pipe by being plastically deformed in the reduced diameter direction while closely contacting the inner periphery of the joint body in a watertight manner. Tighten with Characterized in place being constituted by a reduced diameter section.

According to a sixth aspect of the present invention, in any one of the first to fifth aspects, in both the two joint components, a valve port connected to the through passage, and a direction in which the valve port is closed. The valve mechanism is configured by providing an energized valve body and a valve opening portion that displaces the valve body of the mating joint structure in the valve opening direction when the two joint structures are properly connected. May be.
According to the sixth invention, when the two joint components are separated, both valve ports are closed by the valve body biased in the valve closing direction, and when the two joint components are connected, both valve opening portions Opens the valve port by displacing the valve body on the other side. That is, since the valve mechanism automatically opens and closes with the connection and separation of the two joint components, an operation for switching the valve mechanism to the valve open state or the valve closed state is unnecessary.

Further, as a seventh invention, in any one of the inventions of the second to fifth inventions and the sixth invention, in the state where the tightening ring is normally tightened in the pipe connection mechanism, The joint main body may be abutted at a plurality of locations in the pipe insertion direction, and the fastening ring and the pipe may be abutted at a plurality of locations in the pipe insertion direction.
With such a configuration, the tightening ring abuts on the inner periphery of the joint body at a plurality of locations, and the tightening ring tightens on the pipe at a plurality of locations, so that the reliability of the lock and the seal is excellent.

According to an eighth aspect of the present invention, in any one of the second to fifth aspects, the sixth aspect, and the seventh aspect, the tightening member and the tightening ring are engaged with each other to be tightened. It is good also as a structure which provided the temporary holding means which can hold | maintain a ring in a temporarily assembled state with respect to a clamping member.
According to this configuration, the fastening member and the fastening ring are provided with temporary holding means for holding the fastening ring in a temporarily assembled state with respect to the fastening member by locking the fastening member and the fastening ring. Since both can be unitized by temporarily assembling the ring, the entire temporary assembling work can be performed when temporarily assembling the fastening member in a state of being shallowly screwed into the joint body prior to insertion of the pipe. It becomes easy.

According to a ninth aspect of the present invention, in any one of the second to fifth aspects and the sixth to eighth aspects, the joint main body and the tightening member have a direction in which the diameter of the tightening ring is reduced. A pair of contact surfaces approaching as the tightening member is screwed are provided, and in the process of screwing the tightening member, the pair of contact surfaces remain in non-contact and the tightening surface is not touched. The fastening ring is in a proper tightening state with respect to the pipe, and the normal tightening state of the tightening ring is maintained while the screwing of the tightening member advances to a position where the pair of contact surfaces abut against each other. It is good also as a structure.
According to this configuration, from the position where the tightening ring is in a normal tightening state with respect to the pipe, the tightening ring is further advanced until the pair of contact surfaces are abutted with each other by further screwing the tightening member. Keeps the proper tightening condition, so that the tightening of the tightening ring to the pipe will not loosen. Therefore, when connecting the pipes, it is easy and reliable to visually check whether the work is completed or not by establishing a work manual for screwing the tightening member to a position where the pair of contact surfaces abut against each other. Can be determined.

<Invention of Claim 1>
When the two coupling components are connected by operating the displacement means, the valve mechanism is opened and the two through passages communicate with each other, so that the inside of the flow path connected to the two coupling components The fluid can circulate. Further, when separating the flow paths, if the two joint components are separated by the displacement means, the valve mechanism is closed and the connection end of each through passage is closed. The flow of fluid between the flow paths connected to the joint structure is interrupted. Even if the joint components are separated from this closed state, the fluid in the flow path does not leak to the outside. Therefore, when connecting / separating the flow channel, the step of releasing the fluid in the flow channel to the atmosphere and the step of refilling the fluid into the flow channel are unnecessary.

<Invention of Claim 2>
When connecting both joint components, the check ring rotates relative to one joint component in an illegal connection state where both joint components reach a normal connection state. When it reaches, the rotation of the confirmation ring is restricted. According to the present invention, it is possible to detect the connection state of both joint constituents based on whether or not the confirmation ring can rotate.

<Invention of Claim 3>
In the valve-closed state, the valve body is kept in the correct position and posture without being misaligned or tilted with respect to the valve seat due to surface contact with the metal seat surface as well as the metal valve seat. It is. Therefore, the seal ring provided on the valve body comes into contact with the valve seat uniformly over the entire circumference, and sealing can be performed reliably.

<Invention of Claim 4>
In a state in which the two joint components are normally connected and the valve mechanism is opened, the seal protrusion of one joint component is sealed in an airtight manner by biting into the distal end surface of the other joint component. On the inner peripheral side, the sealing member is sealed by elastic contact with the distal end surface of one joint component, and the connecting portion of the two joint components is reliably sealed by this double sealing means. In addition, the seal member attached to the front end surface of the valve body is subjected to a force that is displaced to the outer peripheral side under the pressure of the fluid flowing through the through passage, but the outer peripheral edge of the seal member is Since the inner peripheral surface approaches and abuts against or comes into contact with the inner peripheral surface, the seal member is prevented from being displaced toward the outer peripheral side.

<Invention of Claim 5>
When the pipe is inserted into the joint body and the fastening member is screwed together, the fastening ring bites into the pipe by the diameter reducing means, so that the pipe is locked in the connected state and the fastening ring is watertight against the outer periphery of the pipe. The space between the joint body and the pipe is sealed by being in close contact with the state. When connecting the pipes, it is only necessary to screw the fastening member, so that the connection work is easier than welding.

<Embodiment 1>
Hereinafter, a first embodiment of the present invention will be described with reference to FIGS. The pipe joint Ja of the present embodiment is mainly for connecting a copper pipe P used for piping as a fluid flow path in a fluid pressure operating device such as a pneumatic device or a hydraulic device. In addition to this, metal pipes P used for refrigerant gas (for example, carbon dioxide etc.) filling such as cold air conditioners, and metal pipes used for plumbing equipment such as water supply / hot water supply for houses are used. The present invention can also be applied to the case where the pipe P is connected. Moreover, the pipe joint Ja of this embodiment is used for piping on the assumption that once the pipe P is connected, the pipe P is not removed.

  The pipe joint Ja is accompanied by relative displacement (connection / disconnection) of the first joint constituent body Ma located on the left side in FIG. 1, the second joint constituent body Mb located on the right side, and both joint constituent bodies Ma and Mb. The valve mechanism Va switches between the valve open state and the valve closed state, and the pipe connection mechanism Ca provided in both of the two joint structural bodies Ma and Mb. In the following description, for the sake of convenience, the first joint structure Ma located on the left side is referred to as the front side, and the second joint structure body Mb positioned on the right side is referred to as the front side. Moreover, the front-rear direction and the axial direction parallel to the axis of the pipe joint Ja are used synonymously. Furthermore, the insertion direction (connection direction) of the pipe P with respect to the pipe joint Ja is parallel to the front-rear direction.

The pipe connection mechanism Ca of the first joint component Ma includes a first metal joint body 10A, a metal fastening member 20, and two metal front and rear fastening rings 30 and 40. .
The first joint body 10A is configured by concentrically connecting a cylindrical brass front cylinder 10AF and a cylindrical brass rear cylinder 10AR through a seal ring 17 by screwing. A male screw portion 11 for screwing the fastening member 20 is formed on the outer periphery of the rear end portion of the rear cylinder 10AR, and a regular hexagon is formed at a position in front of the male screw portion 11 on the outer periphery of the first joint body 10A. The jig fitting portion 12 is formed. A flat contact surface 13 that is orthogonal to the axial direction is formed on the rear end surface of the jig fitting portion 12.

  10 A of 1st coupling bodies have the circular penetration path 14 penetrated between the front-and-rear both end surfaces, and the rear-end part of the penetration path 14 is the circular connection of the diameter same as or slightly larger than the outer diameter of the pipe P It is a hole 16. The front end of the pipe P is inserted into the connection hole 16 from the rear. The inner peripheral surface of the front end side portion of the connection hole 16 is a front tapered surface 16a that decreases in diameter toward the front, and the inner diameter of the rear end of the front tapered surface 16a (the maximum inner diameter of the front tapered surface 16a). ) Is slightly larger than the outer diameter of the pipe P, and the inner diameter of the front end of the front taper surface 16a (the minimum inner diameter of the front taper surface 16a) is set slightly smaller than the outer diameter of the pipe P. The inner peripheral surface of the central portion of the connection hole 16 is a constant diameter surface 16b having a constant diameter from the front end to the rear end. The inner peripheral surface of the rear end side portion of the connection hole 16 is a rear tapered surface 16c (diameter reducing means that is a constituent element of the present invention) that increases in diameter toward the rear. Further, on the rear end surface of the first joint body 10A, a flat surface 10Aa perpendicular to the insertion / extraction direction of the pipe P (= the screwing direction of the tightening member 20 and the moving direction associated with the tightening of the tightening rings 30 and 40). Is formed, and an inner peripheral edge of the flat surface 10Aa, that is, a peripheral edge serving as a boundary with the rear taper surface 16c is an edge-shaped corner edge 10Ab.

  The fastening member 20 is made of brass, and is assembled to the first joint body 10 </ b> A by screwing an internal thread portion 21 of the inner periphery thereof to the external thread portion 11. In addition, an inward projection 23 that protrudes in a circle concentric with the tightening member 20 is formed as a temporary holding means at the rear end of the tightening member 20. A tapered guide surface 24 is formed on the inner peripheral edge of the front end surface 23. Further, an escape hole 25 having a diameter larger than the minimum inner diameter of the inward projection 23 is formed in a circular shape concentric with the inward projection 23 behind the inward projection 23. The rear end of the escape hole 25, that is, the rearmost end of the inner periphery of the tightening member 20, forms a concentric circle with the tightening member 20, and the inner diameter is slightly larger than the outer diameter of the pipe P. An insertion hole 26 having a size smaller than the inner diameter of 25 is formed in the rear end face of the fastening member 20 so as to open.

  The area inside the hollow of the fastening member 20 that is forward of the inward projection 23 and behind the flat surface 10Aa of the first joint body 10A has a constant inner diameter and is concentric with the fastening member 20. The accommodation space 22 is formed. Further, the outer periphery of the fastening member 20 is a jig fitting part 27 having a regular hexagonal shape, like the jig fitting part 12 of the first joint body 10A. A flat contact surface 28 perpendicular to the axial direction is formed on the front end surface of the jig fitting portion 27. The contact surface 28 is in contact with the contact surface 13 of the first joint body 10A in a contact state.

  Both the front and rear tightening rings 30 and 40 are made of copper like the pipe P, and have thin tubular tightening portions 32 and 42 protruding forward from the ring bodies 31 and 41. The outer periphery of the tightening portions 32 and 42 has a smaller diameter than the outer periphery of the ring bodies 31 and 41, and the inner periphery of the tightening portions 32 and 42 is smoothly connected to the inner periphery of the ring bodies 31 and 41.

  The outer periphery of the tightening portion 32 of the front tightening ring 30 is a tapered surface 33 (a tightening means that is a constituent element of the present invention) that decreases in diameter toward the front. The angle is smaller than the rear tapered surface 16c of the one joint body 10A. On the inner periphery of the ring body 31 of the front tightening ring 30, a tapered surface 34 (clamping means that is a constituent element of the present invention) whose diameter decreases toward the front is formed. The front surface of the ring body 31 of the front tightening ring 30 faces the flat surface 10Aa and the corner edge 10Ab of the first joint body 10A and is a tapered surface on the outer peripheral side of the tightening portion 32 of the front tightening ring 30. The tapered contact surface 35 has a larger inclination angle than 33.

  On the other hand, the outer periphery of the tightening portion 42 of the rear tightening ring 40 is a tapered surface 43 (tightening means that is a constituent element of the present invention) that decreases in diameter toward the front, and the inclination angle of the tapered surface 43 is as follows. The angle is smaller than the taper surface 34 of the ring body 31 of the front tightening ring 30.

  Further, an outward projecting portion 44 is formed as a temporary holding means on the extended portion from the rear end surface of the rear tightening ring 40. The outer diameter of the outward protrusion 44 is slightly larger than the inner diameter of the inward protrusion 23 of the fastening member 20, and the outward protrusion 44 and the inward protrusion 23 are locked. Due to the action, the rear tightening ring 40 is temporarily held with respect to the tightening member 20 in a state of being accommodated in the accommodating space 22.

  The pipe connection mechanism Ca of the second joint component Mb has the same configuration as the pipe connection mechanism Ca of the first joint component Ma except for the second joint body 10B (a configuration reversed left and right in the drawing), and therefore the same member Are denoted by the same reference numerals, and detailed description thereof is omitted. Hereinafter, differences between the second joint body 10B and the first joint body 10A will be described. The second joint body 10B of the second joint component Mb is composed of a cylindrical brass front cylinder 10BF and a cylindrical brass rear cylinder 10BR which are sealed ring 17 and a substantially disc-shaped spring receiver. It is configured to be concentrically coupled by screwing through the wall 70. Further, the front end portions of the first joint body 10A and the second joint body 10B constitute a valve mechanism Va which will be described later. Differences between the front end portions of the two joint bodies 10A and 10B will be described in the valve mechanism Va. To clarify.

The two joint components Ma and Mb can be relatively displaced by the displacing means 50 between the normal connection state and the provisional connection state. Hereinafter, the displacement means 50 will be described.
A circumferential fitting groove 51A is formed concentrically with the first joint body 10A on the outer periphery of the front tube 10AF of the first joint body 10A. The fitting groove 51A has a cylindrical shape and a substantially hexagonal shape on the outer periphery. The first operating member 52A in which the jig fitting portion 27A having a cross section is formed engages the holding protrusion 53A facing inward at the rear end thereof, thereby relative to the first joint body 10A in the axial direction. It is attached in a state where displacement is restricted and relative displacement in the circumferential direction is allowed. A male screw portion 54A is formed at the front end portion of the outer periphery of the first operating member 52A.

  On the other hand, a circumferential fitting groove 51B is formed concentrically with the second joint body 10B on the outer periphery of the front tube 10BF of the second joint body 10B. The fitting groove 51B has a cylindrical shape and an outer periphery. The second operating member 52B, on which the jig fitting portion 27B having a substantially hexagonal cross section is formed, engages the inward holding projection 53B at the rear end portion thereof, whereby the axial direction with respect to the second joint body 10B. It is attached in a state where relative displacement in the direction is restricted and relative displacement in the circumferential direction is allowed. A female screw portion 54B is formed at the front end portion of the inner periphery of the second operation member 52B.

  The two joint members Ma and Mb are connected so that the front ends thereof are brought into contact with each other in the direction in which the axes of the through-passages 14 are matched, and are separated while being separated from each other in the axial direction. It has become so. From the separated state, the two joint members Ma and Mb are brought close to each other to engage (screw) the female screw portion 54B of the second operating member 52B with the male screw portion 54A of the first operating member 52A. When the screws 52A and 52B are screwed in such a manner as to be rotated in the reverse direction, both joint components Ma and Mb come close to each other and are temporarily connected. And if it approaches to the re-approaching position where the front end surfaces of both joint main bodies 10A and 10B abut, both joint constituents Ma and Mb will be in a normal connection state. Further, when both the operation members 52A and 52B are rotated in the opposite direction from the normal connection state, both joint constituent bodies Ma and Mb are separated from each other, and after the temporary connection state, the male screw portion 54A and the female screw portion 54A The threaded portion 54B is dissociated and both joint constituent bodies Ma and Mb are detached.

Next, the valve mechanism Va will be described.
When the two joint components Ma and Mb are in the normal connection state, the valve mechanism Va is automatically opened to communicate the two through passages 14 with each other, and the two joint components Ma and Mb are temporarily connected. When it is in the state or unconnected (disengaged) state, it automatically closes and automatically shuts off between the two through passages 14 and airtights the front end portions of the through passages 14 of the joint members Ma and Mb. It is obstructed to the state.

  A first valve port 60a is formed on the inner periphery of the front tube 10AF of the first joint body 10A, and the front end of the first tube body 10A is concentrically reduced in diameter, and adjacent to the rear side of the valve port 60a. Thus, a tapered first valve seat 61a is formed. A circular region surrounding the first valve port 60a on the front end face of the first joint body 10A is a first valve opening 63a corresponding to the front end face of the second valve body 62b described later. Furthermore, in the first joint body 10A, a first valve body 62a elongated in the front-rear direction is accommodated concentrically with the first joint body 10 and capable of displacement in the front-rear direction. A large-diameter portion 64 is formed at the front end portion of the first valve body 62a, and a circular rubber packing 65a is attached (attached) to the front surface of the large-diameter portion 64. The first valve body 62a is mounted between an annular front spring receiving plate 66a directed to the rear surface of the large diameter portion 64 and an annular rear spring receiving plate 67a directed to the front end surface of the rear cylinder 10AR. The compression coil spring 68a is biased forward, and the outer peripheral edge of the packing 65a is always kept in close contact with the first valve seat 61a so as to close the first valve port 60a. ing. A plurality of notches 80 for circulating fluid are formed in the outer periphery of the front spring receiving plate 66a and the outer periphery of the rear spring receiving plate 67a so as to penetrate the front and rear in the circumferential direction.

  On the inner periphery of the front tube 10BF of the second joint body 10B, a cylindrical second valve body 62b is concentric with the second joint body 10B and slidably contacts the inner periphery of the front tube 110BF. It is accommodated so that it can be displaced. A gap between the outer periphery of the second valve body 62b and the inner periphery of the front and rear cylinder 10BF is sealed by an O-ring 69 attached to the outer periphery of the second valve body 62b. Further, a rubber packing 65b (a sealing member which is a constituent element of the present invention) is pasted (attached) to the front end portion of the second valve body 62b by baking. The packing 65b is fitted into a cylindrical portion attached to the inner periphery of the front end portion of the second valve body 62b, an annular portion attached to the front end surface of the second valve body 62b, and a concave portion on the inner periphery of the second valve body 62b. And a ring-shaped protrusion. Further, an annular spring receiving wall 70 protruding inward is provided on the inner periphery of the second joint body 10B by sandwiching the outer periphery between the front tube 10BF and the rear tube 10BR. A rear end of a support rod 71 that is elongated in the front-rear direction and concentric with the second joint body 10 is fixed (supported) to the spring receiving wall 70 in a cantilevered manner by tightening a nut 72. A plurality of notches 81 for allowing fluid to flow are formed in the outer periphery of the spring receiving wall 70 so as to penetrate the front and rear in the circumferential direction. A circular large diameter portion 73 is formed at the front end portion of the support rod 71, and the front end surface of the large diameter portion 73 is a second valve opening portion 63b corresponding to the front end surface of the first valve body 62a. . Moreover, the 2nd valve seat 61b along the outer periphery is formed in the rear surface of the large diameter part 73. As shown in FIG. An annular opening between the second valve seat 61b and the inner peripheral edge of the front end of the second joint body 10B is a second valve port 60b. The second valve body 62b is urged forward by a compression coil spring 68b mounted between the rear surface of the second valve body 62b and the front surface of the spring receiving wall 70, and the inner peripheral edge of the packing 65b is always around the entire circumference. The valve is held in a closed position that closes the second valve port 60b by being in close contact with the second valve seat 61b.

Next, the operation of this embodiment will be described.
First, the pipe P is connected from the rear to the pipe connection mechanism Ca of each joint structure Ma, Mb. At the time of connection, the rear fastening ring 40 is inserted into the fastening member 20 from the front in advance to be temporarily held. In this state, since the outward protrusion 44 is sandwiched between the inward protrusion 23 and the opening edge of the insertion hole 26, the rear tightening ring 40 is restricted from being separated from the tightening member 20. Temporarily held in a state. Thereafter, the front tightening ring 30 is inserted into the tightening member 20 from the front, and the front tightening ring 30 and the temporarily holding tightening member 20 and the rear tightening ring 40 are connected to the joint body 10. Temporarily assembled from behind, the female screw portion 21 is screwed into the male screw portion 11. At this time, the tightening portions 32 and 42 of the tightening rings 30 and 40 are not yet deformed, and the contact surface 28 of the tightening member 20 and the contact surface 13 of the joint body 10 are separated from each other.

  When the pipe P is inserted from the rear into each of the joint components Ma and Mb temporarily assembled, the pipe P has the insertion hole 26, the rear fastening ring 40, the front fastening ring 30, and the constant diameter surface 16b in order. Passing and when the front end of the pipe P hits a position in the middle of the inner peripheral surface of the front tapered surface 16a and stops in front, the manual insertion of the pipe P is finished.

  Thereafter, a jig (not shown) such as a spanner is fitted to the jig fitting portion 12 of the joint body 10 and the jig fitting portion 27 of the fastening member 20, and the fastening member 20 is screwed forward. Rotate in the direction to advance. As the tightening member 20 is screwed, the outer periphery of the pipe P is tightened by being plastically deformed so that the tightening portions 32 and 42 of the front and rear tightening rings 30 and 40 are reduced in diameter. In other words, the tightening member 20 moves forward and presses the rear end surface of the ring body 41 of the rear tightening ring 40 forward by the inwardly protruding portion 23, and the outer peripheral front end edge of the tightening portion 42 of the tightening ring 40. Is lightly abutted against the inner peripheral tapered surface 34 of the front tightening ring 30 and stopped in front, and the outer peripheral front end edge of the tightening portion 32 of the front tightening ring 30 is lightly attached to the rear tapered surface 16c of the joint body 10. It abuts and stops in front. Thereafter, as the tightening member 20 is screwed and the front and rear tightening rings 30 and 40 are advanced, the tightening portion 42 is deformed in a diameter-reduced manner according to the inclination of the tapered surface 34, and at the same time, the front portion tightening is performed. The tightening portion 32 of the attaching ring 30 is deformed in a reduced diameter according to the inclination of the rear tapered surface 16c. As the diameter reduction progresses, the contact form of the taper surface 43 with respect to the taper surface 34 and the contact form of the taper surface 34 with respect to the rear taper surface 16c shift from line contact to surface contact. Then, the tightened portions 32 and 42 having undergone the diameter reduction have their front end inner peripheral portions bite into the outer periphery of the pipe P like a wedge. Further, the tapered contact surface 35 contacts the corner edge portion 10Ab at the boundary between the flat surface 10Aa and the rear taper surface 16c so as to bite the corner edge portion 10Ab.

  In the normal tightening state, the tightening portions 32 and 42 of the two tightening rings 30 and 40 tighten the outer periphery of the pipe P at two front and rear positions, and the tightening portions 32 and 42 bite into the pipe P, whereby the outer periphery of the pipe P And the tightening portions 32 and 42 are in close contact with each other in a watertight manner without causing a gap while causing plastic deformation, and the pipe P and the tightening rings 30 and 40 are sealed, and the pipe P is locked in a retaining state. The Further, the rear tapered surface 16c and the tapered surface 33 are brought into surface contact, and the corner edge portion 10Ab bites into the tapered contact surface 35, whereby the space between the front tightening ring 30 and the joint body 10 is sealed. Furthermore, the taper surface 34 and the taper surface 43 are in surface contact with each other, so that the space between the tightening rings 30 and 40 is also sealed. Moreover, in the contact | adherence area | region of the surface contact state of the taper surfaces 34 and 43 of the clamping rings 30 and 40, the loosening to the front-back direction and the circumferential direction is prevented by frictional resistance. Furthermore, the frictional resistance between the corner edge portion 10Ab and the tapered surface contact surface 35, the frictional resistance between the rear end surface of the ring body 31 and the front end surface of the ring body 41, and the inward direction from the rear end surface of the ring body 41 Due to the frictional resistance with the front surface of the protrusion 23, the tightening rings 30 and 40 function as a lock nut, whereby the displacement of the tightening member 20 in the circumferential direction relative to the joint body 10, that is, the tightening member 20 Looseness is prevented.

  Now, in the process in which the tightening member 20 is screwed, a normal tightening state is reached in the middle of the tightening stroke. That is, when the tightening rings 30 and 40 reach a regular tightening state (a state in which the space between the pipe P and the outer periphery of the pipe P is securely sealed), the contact surface 28 of the tightening member 20 does not contact the joint body 10. It does not contact the contact surface 13. At this time, the operator cannot recognize from the appearance that the tightening rings 30 and 40 are in the normal tightening state, but in the work manual, the tightening is performed until the contact surfaces 13 and 28 come into contact with each other. Since the screwing of the attaching member 20 is to be continued, the operation of screwing the fastening member 20 is continued even after the normal tightening state is achieved. When the tightening member 20 is screwed until the contact surfaces 13 and 28 come into contact with each other, the tightening member 20 is stopped in front and the further screwing is restricted. Thus, the connection work of the pipe P is completed. While the screwing of the tightening member 20 is continued until the contact surfaces 13 and 28 come into contact with each other from the time when the normal tightening state is reached, the normal tightening state and the waterproof performance (seal performance) resulting from the normal tightening. And the retaining function (lock function) of the pipe P is maintained.

  Now, after connecting the pipe P to the rear ends of the two joint components Ma and Mb as described above, the first joint member 52A and the second joint member 52B are screwed together and screwed into the two joints. The structural bodies Ma and Mb are connected. When the connecting operation proceeds and the joint bodies Ma and Mb approach, the valve opening portion 63a of the first joint body Ma separates the second valve body 62b of the second joint body Mb from the second valve seat 61b. The second valve-opening portion 63b of the second joint component Mb moves the first valve body 62a of the first joint component Ma away from the first valve seat 61a while being pushed to the rear (backward in the second joint component Mb). Push in the direction (backward in the first joint structure Ma). The valve mechanism Va is opened by the backward displacement of the two valve bodies 62a and 62b, and the through passage 14 of the first joint constituent body Ma and the through passage 14 of the second joint constituent body Mb are allowed to flow. Communicate with the state. At this time, the O-ring 69 on the outer periphery of the second valve body 62b is kept in close contact with the inner peripheral surface of the front cylinder 10BF, and the packing 65b of the second valve body 62b and the first valve opening portion 63a are in close contact with each other. Therefore, the fluid in both the through passages 14 does not leak out of the joint constituent bodies Ma and Mb.

  Then, when the front end surfaces of the front cylinder 10AF and the front cylinder 10BF are in close contact with each other, the two joint components Ma and Mb are brought into the normal connection state closest to each other, and the connection between the two joint components Ma and Mb is thus completed. The work is complete. During the normal connection state, the sealed state by the O-ring 69 and the packing 65b of the second valve body 62b is maintained. Moreover, in this connection state, both valve ports 60a and 60b open the largest, and a smooth circulation of the fluid is ensured.

  In the process of rotating the operating members 52A and 52B and separating the joint components Ma and Mb from the normal connection state, both the valve opening portions 63a and 63b are moved backward relative to the counterpart valve bodies 62a and 62b. Therefore, the opening degree of the valve ports 60a and 60b is gradually reduced. And while the sealing state by the O-ring 69 of the 2nd valve body 62b is maintained, the valve bodies 62a and 62b contact | adhere to the valve seats 61a and 61b, and the valve mechanism Va will be in a valve closing state. Thereby, while the front-end part of the through-passage 14 in the 1st joint structure Ma is obstruct | occluded in an airtight state, the front-end part of the through-passage 14 in the 2nd joint structure Mb is obstruct | occluded in an airtight state, a 1st joint structure The flow path by the pipe P on the Ma side and the flow path by the pipe P on the second joint component Mb side are blocked so that the fluid cannot flow. Thereafter, as the joint components Ma and Mb move away from each other, the valve opening portions 63a and 63b are separated from the respective valve bodies 62a and 62b, and finally, both the operation members 52A and 52B are separated. Both joint components Ma and Mb are separated. In the separated (detached) state, the fluid remaining in the flow path (pipe P) on the first joint structure Ma side and the fluid remaining in the flow path (pipe P) of the second joint structure Mb The side does not leak out from the front end of each joint structure Ma, Mb.

According to the pipe joint Ja of the first embodiment, the following operations and effects are achieved.
(A) When the two joint components Ma and Mb are in a connected state, the two through-passages 14 communicate with each other, and when the two joint components Ma and Mb are in a detached state, Since the valve mechanism Va that is in a closed state that closes the connection end (front end) is provided, even if the joint members Ma and Mb are separated from each other, the flow paths (through passages 14) and the socks are separated. The fluid in the continuous pipe P does not leak to the outside, and when the flow path on the first joint structure Ma side and the flow path on the second joint structure body Mb are connected and separated, the fluid in the flow path is released to the atmosphere. This step and the step of refilling the fluid into the flow path are unnecessary.

  (B) The two joint components Ma and Mb can be connected to and separated from each other, and both the two joint components Ma and Mb are connected to the valve ports 60a and 60b connected to the through passage 14 and the valve ports 60a, When the valve bodies 62a and 62b urged in the closing direction of 60b and the two joint structural bodies Ma and Mb are connected, the valve bodies 62a and 62b of the mating joint structural bodies Ma and Mb are moved in the valve opening direction. Since the valve mechanism Va is configured by providing the valve opening parts 63a and 63b to be displaced, when the two joint components Ma and Mb are separated, both the valve ports 60a and 60b are urged in the valve closing direction. Are closed by the valve bodies 62a and 62b, and when the two joint components Ma and Mb are connected, the valve opening portions 63a and 63b displace the counterpart valve bodies 62a and 62b to open the valve ports 60a and 60b. . That is, since the valve mechanism Va automatically opens and closes when the two joint components Ma and Mb are connected and disconnected, an operation for switching the valve mechanism Va to the valve opening or closing state is unnecessary.

  (C) When the pipe P is inserted into the joint main bodies 10A and 10B and the fastening member 20 is screwed together, the fastening rings 30 and 40 bite into the pipe P by the diameter reducing means, so that the pipe P is locked in the connected state. At the same time, since the fastening rings 30 and 40 are in close contact with the outer periphery of the pipe P in a watertight state, the joints 10A and 10B and the pipe P are sealed. In this case, it is only necessary to screw the tightening member, and the connection work is easier than welding.

(D) Since the tightening rings 30 and 40 abut on the inner periphery of the joint body 10 at a plurality of locations and the tightening rings 30 and 40 are tightened on the pipe P at a plurality of locations. Excellent in reliability.
(E) Prior to the insertion of the pipe P, the fastening member 20 is temporarily assembled in a state where the fastening member 20 is shallowly screwed into the joint body 10, but is locked to the fastening member 20 and the rear fastening ring 40. Thus, temporary holding means for holding the tightening ring 40 in a temporarily assembled state with respect to the tightening member 20 is provided. Therefore, by temporarily assembling the rear tightening ring 40 to the tightening member 20, both Is unitized, and the entire temporary assembly work is easy.

  (F) From the position where the tightening rings 30 and 40 are in a proper tightening state with respect to the pipe P, the screw member 20 is further screwed forward until the pair of contact surfaces 13 and 28 are brought into contact with each other. Meanwhile, since the tightening rings 30 and 40 are kept in a normal tightening state, the tightening of the tightening rings 30 and 40 to the pipe P is not loosened. Therefore, when the pipe P is connected, if an operation manual is set that the tightening member 20 is screwed up to a position where the pair of contact surfaces 13 and 28 abut against each other, it is determined whether or not the operator has completed the operation. It can be easily and reliably determined visually.

<Embodiment 2>
Next, a second embodiment of the present invention will be described with reference to FIGS. The pipe joint Jb of the second embodiment is configured to include a first joint constituent body Mc, a second joint constituent body Md, and a valve mechanism Vb, and a part thereof is different from the pipe joint Ja of the first embodiment. Hereinafter, differences from the first embodiment will be described. The same components as those of the first embodiment are denoted by the same reference numerals, and description of the structure, operation, and effect will be omitted.

  The large-diameter portion 91 of the first valve body 90 of the first joint component Mc is formed with a seat surface 92 having a taper shape with the same angle as that of the valve seat 61a. The sheet 61a comes into contact with the surface (surface contact state). The large-diameter portion 91 is formed with a circumferential mounting groove 93 in which a part of the seat surface 92 is cut, and a rubber seal ring 94 is assembled in the mounting groove 93. In the valve open state, the outer peripheral edge of the seat seal ring 94 protrudes to the outer peripheral side from the seat surface 92. A positioning hole 95 is formed at the front end of the first valve body 90 at the front end of the cylindrical main body 10A, that is, at a position in front of the valve seat 61a. Is formed with a positioning projection 96 which is fitted in a state in which the relative displacement in the radial direction is restricted with respect to the positioning hole 95 in the valve-closed state. The positioning protrusion 96 is located in front of the seal ring 94, but the front spring receiving plate 66a provided in the rear of the seal ring 94 is in the radial direction with respect to the inner periphery of the cylindrical main body 10A. The first valve body 90 moves in the front-rear direction without relative displacement. While moving, the outer peripheral edge of the front spring receiving plate 66a is in sliding contact with the inner periphery of the joint body 10A.

  The joint bodies 10A and 10B of the first embodiment are composed of two parts, but both the first joint body 10A and the 210th of the second embodiment are composed of a single part. Further, the first joint body 10A is not provided with a member corresponding to the first operation member 52A of the first embodiment, and the operation of the second joint structure Md is provided on the outer periphery of the front end portion of the first joint body 10A. A male screw portion 54A to which the member 52B is screwed is formed.

When the valve mechanism Vb is closed, the metal valve seat 61a and the metal seat surface 92 are in surface contact with each other, so that the first valve body 90 is misaligned or inclined with respect to the valve seat 61a. It is kept in the correct position and posture without any trouble. Therefore, the seal ring 94 provided in the first valve body 90 comes into contact with the valve seat 61a uniformly over the entire circumference, and can be reliably sealed.
Moreover, in the valve-closed state, the fitting main body 10A is fitted at the two front and rear positions of the positioning protrusion 96 and the front spring receiving plate 66a, and the two positions move the seat surface 92 and the seal ring 94 in the front-rear direction (both Since the joint structure Mc and Md are positioned so as to be sandwiched between the joint body Mc and the movement direction of the first valve body 90), the posture of the first valve body 90 with respect to the joint body 10A is stabilized, and the valve seat 62a Therefore, the seat surface 92 reliably contacts the surface, and as a result, the elastic contact state of the seal ring 94 with respect to the valve seat 62a becomes uniform in the circumferential direction. Further, since the first valve port 60a is doubly sealed by the elastic contact of the seal ring 94 to the valve seat 62a and the metal touch of the seat surface 92 to the valve seat 62a, the first valve port 60a is highly airtight.

  Further, a ring-shaped seal protrusion 97 is formed on the front end face of the joint body 10A of the first joint component Mc so as to surround the first valve opening 63a and the through passage 14. On the other hand, the front end surface of the joint body 10B of the second joint structure Md is a seal surface 98 that faces the seal protrusion 97. When both joint constituent bodies Mc and Md are in the normal connection state, the seal protrusion 97 comes into contact with the seal surface 98 of the second joint constituent body Md, and in this ring-shaped bite area, the metal seal Airtightness is maintained.

Further, in a state where both joint constituent bodies Mc and Md are connected and the valve mechanism Vb is opened, the front end face of the packing 65b attached to the front end portion of the second valve body 62b is the first joint constituent body. The outer peripheral edge of the front end portion of the packing 65 b approaches the inner peripheral surface of the seal projection 97 and opposes or contacts with the elastic peripheral contact with a region on the inner peripheral side with respect to the seal projection 97 on the tip surface of Mc. It is like that.
Therefore, in a state where the two joint structural bodies Mc and Md are normally connected and the valve mechanism Vb is opened, the seal protrusion 97 of the first joint structural body Mc bites into the seal surface 98 at the tip of the second joint structural body Md. Thus, on the inner peripheral side, the seal 65b of the second joint component Md is sealed by elastic contact with the distal end surface of the first joint component Mc. By the means, the connecting portion of the two joint structural bodies Mc and Md is reliably sealed. In addition, a force that is displaced to the outer peripheral side by receiving the pressure of the fluid flowing through the through passage 14 is applied to the portion of the packing 65b that is attached to the distal end surface of the second valve body 62b. Since the outer peripheral edge of the seal is close to or is in contact with or in contact with the inner peripheral surface of the seal projection 97, the packing 65b is prevented from being displaced to the outer peripheral side or peeled off from the second valve body 62b. Yes.

  Further, a holding groove 100 in the circumferential direction is formed between the jig fitting portion 57A and the male screw portion 54A on the outer periphery of the front cylinder 10AF of the first joint component Mc, and the holding groove 100 includes A confirmation ring 101 having a ring shape concentric with the first joint body 10A is attached in a state in which detachment is restricted. The confirmation ring 101 is made of rubber, and is relatively relative to the front tube 10AF in a state where the joint bodies Mc and Md are not normally connected (such as a detached state or a temporary connection state that does not lead to a normal connection). It can rotate freely. Further, the rear end surface of the confirmation ring 101 is a flat surface perpendicular to the connection direction of both joint components Mc and Md, and the front end surface of the jig fitting portion 57A (the connection direction of both joint components Mc and Md). (A flat surface perpendicular to the surface) and facing the surface parallel to each other with a slight contact or a slight gap.

  In a state where both joint structural bodies Mc and Md are normally connected, the check ring 101 is elastically compressed and deformed so as to be crushed between the front end face of the jig fitting portion 57A and the front end face of the second operation member 52B. Thus, the gap between the first operating member 52A and the second operating member 52B is sealed. Therefore, based on whether or not the confirmation ring 101 can rotate, it is possible to detect whether or not both joint constituent bodies Mc and Md are properly connected. Further, since the confirmation ring 101 is made of a rubber material having elasticity, in the normal connection state, the backlash of the second operation member 52B with respect to the second joint body 10B is prevented by the elastic restoring force of the confirmation ring 101. Further, due to the elastic restoring force of the confirmation ring 101, the operation member 52B is rotated in the direction of separation, that is, loosened by the frictional force between the confirmation ring 101 and the joint body 10A and the frictional force between the confirmation ring 101 and the operation member 52B. Is prevented. Furthermore, since the gap between the jig fitting portion 57A and the operation member 52B is closed by the confirmation ring 101, the entry of foreign matter into the gap is prevented.

  In addition, the joint members Mc and Md are not provided with connection means corresponding to the pipe connection mechanism Ca of the first embodiment, and instead, a cylindrical pipe connection member 102 is provided. The pipe connection member 102 is fixed to the rear end portions of the joint bodies 10A and 10B by welding, and the end portions of the pipes (not shown) are hermetically sealed by welding to the rear end portions of the pipe connection members 102 whose diameters are reduced. It is fixed.

<Other embodiments>
The present invention is not limited to the embodiments described with reference to the above description and drawings. For example, the following embodiments are also included in the technical scope of the present invention.
(1) In the first and second embodiments, the valve body is in surface contact with the valve seat in the closed state. However, according to the present invention, the valve body is in line contact with the valve seat in the closed state. You may make it do.
(2) In the second embodiment, the confirmation ring is made of rubber. However, according to the present invention, the confirmation ring may be made of synthetic resin or metal.
(3) In the second embodiment, the posture of the valve body is stabilized at two locations, the front and the rear of the seal ring in the valve closed state, but according to the present invention, either the front or the rear of the seal ring Only one of them may stabilize the posture of the valve body.
(4) A structure that stabilizes the posture of the valve body at the two front and rear positions (96 and 66a) of the second embodiment may be applied to the first embodiment.
(5) The metal seal structure by the seal protrusion 97 of the second embodiment may be applied to the first embodiment.
(6) A structure that restricts displacement of the packing 65b of the second joint constituent body radially outward by the seal protrusion 97 formed on the first joint constituent body of the second embodiment may be applied to the first embodiment. .
(7) A seal structure in which a tapered seat surface 92 is formed on the first valve body of the second embodiment and is in surface contact with the valve seat 61a may be applied to the first embodiment.
(8) A seal structure in which the seal ring 94 is attached to the seat surface 92 of the first valve body of the second embodiment may be applied to the first embodiment.
(9) In the second embodiment, the confirmation ring has a substantially square cross section. However, according to the present invention, the cross section of the confirmation ring may be a substantially triangular shape, a substantially circular shape, or the like.
(10) The confirmation ring 101 of the second embodiment is applied to the first embodiment, and the confirmation ring 101 is sandwiched between the front end faces (opposing faces) of the first operation member 52A and the second operation member 52B. It may be.
(11) In the pipe connection mechanism of the first embodiment, the tapered surface of the diameter reducing means is provided on all of the joint body and the front and rear tightening rings. It may be provided on only one of the fastening rings, or may be provided on only one of the front fastening ring and the fastening member.
(12) In the first embodiment, each tightening ring bites into the pipe at one place, but according to the present invention, the tightening ring may bite into the pipe at two or more places.
(13) Although two fastening rings are provided in the first embodiment, two or more fastening rings may be provided according to the present invention.
(14) In the said Embodiment 1, you may apply the pipe connection structure by welding of Embodiment 2 to any one joint structure.
(15) In the second embodiment, the pipe connection mechanism of the first embodiment may be applied to any one joint structure.

Sectional drawing showing the state which the 1st joint structure and the 2nd joint structure connected in Embodiment 1. Sectional view of the first joint component Sectional view of the second joint structure Sectional drawing showing the process of connecting a pipe to the first joint component Sectional drawing showing the state which connected the pipe to the 1st joint composition Enlarged sectional view showing the valve mechanism on the second joint component side Sectional drawing showing the state which connected the 1st joint structure and 2nd joint structure in Embodiment 2. Sectional view of the first joint component Sectional view of the second joint structure Partially enlarged sectional view showing the state immediately before the two joint components reach the normal connection state Partial enlarged cross-sectional view showing a state where both joint components are properly connected Partial expanded sectional view showing the valve mechanism of the first joint component

Explanation of symbols

Ja ... Pipe joint Ca ... Pipe connection mechanism Ma ... First joint component Mb ... Second joint component Va ... Valve mechanism P ... Pipe 10A ... First joint body 10B ... Second joint body 14 ... Through-passage 16c ... Tapered surface (Reducing means)
20 ... Fastening member 30 ... Fastening ring 33 ... Tapered surface (means for reducing diameter)
34 ... Tapered surface (diameter reducing means)
40: Tightening ring 43 ... Tapered surface (diameter reduction means)
50 ... Displacement means 61a, 61b ... Valve seats 62a, 62b ... Valve body 65b ... Packing (seal member)
Jb ... Pipe joint Mc ... First joint component Md ... Second joint component Vb ... Valve mechanism 92 ... Seat surface 94 ... Seal ring 97 ... Seal protrusion 101 ... Check ring

Claims (5)

Two joint arrangements comprising a through-passage capable of being connected to a fluid flow path;
Displacement means for relatively displacing the two joint components between a connected state and a detached state;
When the two joint components are in a connected state, the two through-passages are in communication with each other, and when the two joint components are in a disengaged state, the connection end of the two through-passages is closed. A pipe coupling comprising a valve mechanism that is in a valve state. Either one of the joint components can be relatively rotated in the connection process of the two joint components, and when the two joint components reach a normal connection state, The pipe joint according to claim 1, wherein a confirmation ring that is restricted in rotation by being sandwiched between the pipes is provided. The valve mechanism includes a metal valve body capable of reciprocal movement, and a metal valve seat having a tapered shape inclined with respect to the moving direction of the valve body,
The valve body is provided with a seat surface that can come into surface contact with the valve seat in a closed state and a seal ring that can come into elastic contact with the valve seat. Or the pipe joint of Claim 2. The two joint components are made of metal;
A ring-shaped seal that abuts in an airtight manner by biting into the tip surface of the other joint component in a state where the two joint components are connected to the tip surface of one of the joint components A protrusion is formed,
The other joint component is provided with a cylindrical valve body having a seal member attached to the distal end surface and an inner circumference constituting a part of the through passage,
In a state where the two joint components are connected and the valve mechanism is opened, the tip surface of the seal member is a region on the inner peripheral side of the seal protrusion on the tip surface of the one joint component. 4. The structure according to claim 1, wherein the outer peripheral edge of the seal member is in close contact with or opposed to the inner peripheral surface of the seal protrusion. A pipe joint according to any one of the above. At least one of the two joint components is provided with a pipe connection mechanism for connecting a metal pipe constituting the flow path,
The pipe connection mechanism is
A tubular joint body that allows insertion of the pipe;
A cylindrical fastening member screwed into the joint body;
A metal clamping ring having a cylindrical shape surrounding the pipe inserted into the joint body;
A taper surface inclined with respect to the pipe insertion direction, and plastically deforming in the diameter-reducing direction while closely fitting the fastening ring to the inner periphery of the joint body as the fastening member is screwed. Further, the tightening ring is configured to include a diameter reducing means that is tightened in a form in which the tightening ring bites into a loosely regulated state and / or comes into close contact with a watertight state with respect to the outer periphery of the pipe. The pipe joint according to any one of claims 1 to 4.

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