KR920005279Y1 - Fluid coupling - Google Patents

Abstract

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Description

Fluid fittings

1 and 2 are longitudinal side views of a quarter portion of the separated and connected state of a fluid fitting showing an embodiment of the present invention.

FIG. 3A is an enlarged longitudinal sectional side view of a quarter portion showing an enlarged view of the cylindrical valve body of the fluid fitting shown in FIGS. 1 and 2; FIG.

A-A cross section figure of FIG. 3B or 3A.

4 is an enlarged cross-sectional explanatory view of a lock mechanism of a conventional fluid joint.

* Explanation of symbols for main parts of the drawings

1: fluid fitting 11: socket

12: fluid passage hole 14: plug insertion portion

16: lockball 18: sleeve

18c: tapered surface 20: cross section square ring

31: plug 31a: plug end

32: fluid passage hole 34: insertion portion into the socket

35: lock ball engaging groove 35a: groove wall

35c: Bottom 36: Sealing

The present invention is, for example, a fluid used when connecting and separating the main body and the chip of the crater used in the case of extending, branching, gathering, etc. of the fluid pipe, mold making by the shell mold, glass processing, and the like. It is about improvement of joint.

A socket having a fluid through hole of a conventional fluid fitting hole used for extending, branching, and gathering a fluid pipe, and having an insertion portion of a plug communicating substantially concentrically with the fluid through hole; And a plug having an insertion portion which can be inserted into a socket in a substantially concentric state in the fluid passage hole, and a locking mechanism for engaging both when the socket and the plug are connected. The socket and plug can be connected and disconnected through the locking mechanism by insertion, and a sealing ring for preventing leakage of fluid is attached to the connection surface of the socket and the plug. The sealing method by this sealing ring is divided into the so-called one-sided sealing method of sealing the tip end surface of the plug by sealing the surface of the plug with the sealing ring, and the so-called side sealing method of sealing the outer peripheral surface of the plug by sealing the surface of the plug. The present has arrived.

Further, as shown in FIG. 4, the lock mechanism has a taper hole 63 formed at various places in the same circumferential direction (only one of several sheets is shown in the drawing) of the main cylinder portion 62 of the socket 61. As shown in FIG. When the lock ball 65 fitted in the lock ball 65 is pressed at right angles to the centripetal direction by the inner surface 68a of the sleeve 67, the lock ball 65 is engaged with the lock ball engaging groove 73, Unnecessary separation of the socket 61 and the plug 71 at the time of connection is prevented.

In such conventional fluid fittings, the sealing performance is not impaired except when the service life has elapsed when used at or near room temperature without deforming the fitting material. For example, shell mold casting or glass processing In the case of a fluid joint used at a high temperature such as the above, there is a problem that the joint material does not only cause thermal expansion, but also decrease the sealing performance due to weakening and shrinking of the sealing member.

The object of the present invention is to focus on the above-described problems so as not to cause deterioration of the sealing performance in the case of use under high temperature or high fluid temperature.

The present invention is a plug having a fluid through hole and having an insertion portion of a plug which communicates with the fluid through hole approximately concentrically, a plug having a fluid through hole and also having an insertion portion into the socket which is approximately concentric with the fluid through hole; And a locking mechanism including a sleeve for locking both of the socket and the plug when the socket and the plug are engaged, and an engaging groove of the locking ball and the locking ball, and through the locking mechanism by mutual insertion of the socket and the plug. In the fluid joint that can be connected and disconnected, the taper surface for pressing the lock ball of the lock mechanism in the centripetal direction on the inner circumferential surface of the plug-side opening end of the sleeve constituting a part of the lock mechanism provided in the socket. The groove wall near the socket of the lockball engaging groove installed in the plug. The force of the pressing force of the lock ball pressed by the tapered surface in the centripetal direction is formed at an angle suitable for actively pushing the plug into the socket, and the depth of the lock ball engaging groove is determined by the depth of the socket and the plug. The lock ball does not come into contact with the bottom surface when connected to the wall, and the outer circumference of the tip of the plug contacts the inside of the socket when connected to the socket, and fits a metal seal ring that deforms when the temperature rises. As a means to solve.

In the fluid joint according to the present invention, when the plug end is inserted into the plug insertion part of the socket, the sealing ring installed at the plug end is in contact with the inside of the socket, and on the other side, the force of the force pushing the lock ball in the centripetal direction is applied to the lock ball of the plug. The plug is pressed in the insertion direction by acting on the fitting groove, so that the cross-sectional sealing mechanism between the socket and the plug always maintains the sealing function stably. In addition, when the socket and plug are connected to the socket or the plug due to the influence of fluid temperature, the seal is also thermally changed in the same manner. Therefore, the seal attached to the plug side by the force of the pressing force by the lock ball is used. The ring and socket are pressed together more strongly than when used at room temperature, further improving seal performance.

1 to 3 show one embodiment of the present invention, the fluid fitting 1 is a socket (for example, a crater body in the manufacture of a shell mold mold, 11) connected to a supply side of a combustible gas, for example. It is a plug (crater chip at the time of shell mold casting manufacture) 31 connected to the combustion side of gas.

The socket 11 has a fluid passage hole 12 in its axial center, and has a male threaded portion 13 for pipe connection at its rear part (the side opposite to the plug 31), and on the whole (plug side). It has the plug insertion part 14 which communicates concentrically with the fluid passage hole 12. As shown in FIG.

In the metal cylinder portion 15 having the plug insertion portion 14, the receiving hole 17 of the lock ball 16 constituting a part of the lock mechanism in four places in the same circumferential direction has a small diameter in the centripetal direction and is centrifugal. It is formed as a taper hole (conical hole) having a larger diameter toward the direction.

In addition, a coil spring engaging ring 15a provided on the outer circumference of the socket cylinder portion 15 is disposed on the outer circumference of the socket cylinder portion 15 such that a sleeve 18 constituting another portion of the lock mechanism is slidable in the axial direction. ) And the compression coil spring 19 are fitted between the partition side surface 18b of the inward flange portion 18a for locking the locking ball provided in the inner water of the sleeve 18. In addition, a tapered surface 18c constituting the other surface of the inward flange portion 18a for locking the ball ball is formed, and is formed to gradually increase in diameter toward the plug 31 side to center the lock ball 16. Press in the direction. Angle (theta) which this taper surface 18c makes with the axial center line of the socket cylinder part 15 is set smaller than 45 degrees. Moreover, the cylindrical opening 29 of the sleeve 18 formed adjacent to this taper surface 18c is formed in the magnitude | size which a part of lock ball 16 always faces.

In addition, in the inside of the plug insertion portion 14 of the socket 11, when the plug 31 is connected to the socket 1 ', a cross-sectional quadrangular ring portion pressed by the tip portion 31a of the plug 31 is provided. Concentric with the traditional part 21b of the cylindrical valve body 21 mentioned later, it is formed with the same material as the socket main cylinder part 15.

The wall surface portion 14a of the plug insertion portion 14 of the socket 11 is formed of a gentle taper in a shape suitable for the outer circumferential shape of the tip portion 3a of the plug 31.

The fluid through-hole 12 formed in communication with the plug insertion portion 14 at the shaft center portion of the socket cylinder portion 15 has a traditional portion 21b in its entirety, and a tubular portion having a valve head portion 22 in the rear portion. The valve body 21 is arrange | positioned so that sliding is possible. As shown in FIG. 3A, the cylindrical valve body 21 is formed at the outer circumferential portion of the middle barrel portion 21a provided at an intermediate position between the traditional portion 21b and the valve head 22 and at the shaft center portion of the traditional portion 21b. The formed opening 21d is in communication with each other, and forms a fluid passage hole. The valve head portion 22 is formed of a metal seal material, and is biased in the first direction by a compression coil spring 23 fitted to the outer circumference of the middle barrel portion 21a, and the fluid passage hole 12 is The metal valve head portion 22 can also be closed.

The plug 31 has an axial fluid passage hole 32 in its axial center portion, and an insertion portion 34 into the socket on the outer circumference of the whole (socket 11 side), and the insertion portion into this socket. 34, the engaging groove 35 of the lock ball 16 is formed in the circumferential direction as is well known. The lock ball engaging groove 35 has a tapered surface 18c of the sleeve 18 in which the groove wall surface 35a of one side (close to the socket 11) is provided on the outer circumference of the socket 11. It is formed at an angle γ suitable for causing the component force of the pressing force acting with respect to 16) to act in the insertion direction of the plug 31. It is preferable that this taper angle (gamma), ie, the angle with respect to the axial center of a plug cylinder part, is larger than 45 degrees or 45 degrees. In addition, the length of the lock-ball engaging groove 35 is set by the surgery that the lock ball 16 does not contact a bottom face at the time of connection of the socket 11 and the plug 31. FIG.

A metal sealing ring 36 is fitted to the tip portion 31a of the plug 31. The metal sealing ring 36 is made of a material (eg Al material) having a larger coefficient of thermal expansion than the material of the socket 11 (eg, SS material). The sealing ring 36 and the socket 11 are made of metal. In order to increase the pressure contact strength with the ring-shaped section 20 of the cross-sectional shape provided in the interior of the cylinder, in other words, in order to make the seal more robust, the seal ring 36 is thermally deformed larger than the socket 11 when the temperature rises. The outer circumference 20a of the ring portion 20 is configured to be pressed firmly.

When a shape memory alloy (for example, Ti-Ni alloy) is used for the material of the seal ring 36, and the shape memory effect is used, the sealing ring (for the thermal expansion of the socket 11 and the plug 31) The deformation amount due to the shape memory effect of 36) is set to be higher than that.

In addition, the metal seal ring 36 is to be brought into line contact with the outer circumference 20a of the cross-sectional rectangular ring portion 20 provided inside the socket 11, as shown in an enlarged manner in the circle of FIG. In order for the inner periphery 36a to be cut by C surface, the inner periphery 36a does not come into contact with another one unintentionally.

The insertion part outer circumferential surface 37 of the plug 31 into the socket is formed with a tapered surface suitable for the wall surface portion 14a formed in the plug insertion portion 14 of the socket 11, and the socket 11 and the plug ( 31) To ensure mutual insertion and centering.

In connecting the socket 11 and the plug 31 of the fluid fitting port 1, the sleeve 18 in the first degree state is turned to the left in the first direction against the elastic force of the compression coil spring 19. Let it slide slightly. At this time, the lock ball 16 is movable into the lock ball release cylindrical opening 24 formed largely between the tapered surface 18c and the inner surface of the sleeve 18 and the nut-shaped portion 15b of the main cylinder portion 15. Therefore, in this state, when the insertion portion 34 of the plug 31 into the socket is inserted with the plug insertion portion 14 of the socket 11, first, the tubular valve element is formed by the tip portion 31a of the plug 31. By pressing the traditional part 21b of 21, the valve head part 22 opens the fluid passage hole 12 rapidly. In this process, the tip portion 31a of the plug 31 enters the ring portion 20 of the rectangular cross section installed inside the socket 11 and contacts the ring portion 20 when the insertion state is completed. On the other side, the lock ball 16 of the saw 11 is opposed to the lock ball engaging groove 35 of the plug 31 in the direction of the salvation core, and the lock ball 16 has the lock ball engaging groove 35 Is inserted). When the sleeve 18 is released when this state is reached, the sleeve 18 moves in the second right direction by the repulsive force of the compression coil spring 19, and the tapered surface of the sleeve 18 18c), the lock ball 16 is pushed into the lock ball engaging groove 35 of the plug 31 in the centripetal direction, so that the repulsive force of the compression coil spring 19 is tapered surface 18C, lock ball 16 ) And the taper angle γ act as a force for pressing the plug 31 in its insertion direction (left direction) through the groove wall surface 35a having a larger angle than 45 °, resulting in a fully connected state shown in FIG. .

In this fully connected state, since the lock ball engaging groove 35 of the plug is set to a dimension such that the lock ball 16 does not contact the groove wall surface 35b and the groove bottom surface 35c, the plug 31 The pressing force in the insertion direction of is maintained by the repulsive force of the compression coil spring 19 so that the C surface cut inner circumference 36a of the seal ring 36 fitted to the outer circumferential surface of the distal end of the plug 31 is connected to the socket 11. It is pressed strongly in the line contact state of the outer periphery 20a of the ring part 20 of the rectangular cross section in the inside, and the sealing performance by this metal seal is always maintained in a stable state.

Next, when the temperature of the fluid fitting 1 is raised due to the gas passing through the fluid passage holes 12 and 32, the heat deformation of the sealing ring 36 causes the body portion of the socket 11 and the plug 31 to be heated. Since it becomes larger than the thermal deformation of, the pressure contact strength between the ring portion 20 on the socket 11 side and the seal ring 36 is increased, and the socket (with the force pressing the plug 31 in the insertion direction) is increased. 11) and the sealing performance between the plug 31 is further improved.

When the socket 11 and the plug 31 in this connection state are separated, the sleeve 18 slides in the second direction to the left and the sleeve 18 is tapered surface 18c and the inner circumferential surface and the main cylinder portion 15. The lock-ball release tubular opening 24 is largely formed between the nut-shaped portion 15b. At this time, since the lock ball 16 can be easily moved toward the lock ball release cylindrical opening 24, it can be easily separated by the separation operation of the socket 11 and the plug 31.

In addition, even if the plug 31 is accidentally dropped on the ground while the socket 11 and the plug 31 are separated, the inner circumference 36a which performs the C surface cutting, which plays an important role as the sealing ring 36, may be damaged. Since it does not receive, even if the socket 11 and the plug 31 are connected again, sealing property will not fall.

As described in detail above, the fluid fitting according to the present invention has a tapered surface for pressing the lock ball of the lock mechanism in the centripetal direction on the inner circumferential surface of the plug-side opening end of the sleeve constituting a part of the lock mechanism provided in the socket. The force of pressing the lock ball which presses the taper angle to the groove wall surface of the socket side of the lock ball engaging groove formed in the plug, and the tapered surface in the centripetal direction is formed inside the socket. While forming the plug at an angle suitable for advancing the plug firmly in the direction, the depth of the lock ball engagement groove is set to a dimension such that the lock ball does not contact the bottom when the socket and the plug are connected, and the outer periphery of the tip of the plug. The metal seal ring which deforms at the time of temperature rise while fitting in contact with the socket at the time of connection with a socket is Problems were found in conventional fluid yieumgu which results in a decrease in sealing performance in the temperature rise does not occur, it is possible to obtain the excellent effect of more improving the sealing performance in the temperature rise.

Claims (1)

A socket (11) having a fluid through hole (12) and an insertion portion (14) of a plug (31) in communication with the fluid through hole (12) approximately concentrically; and a fluid through hole (32). A plug 31 having an insertion portion 34 into the concentric socket 11 with the fluid through-hole 12 and for engaging the socket 11 with the plug 31 in a locked state. A lock mechanism composed of a sleeve 18 and a lock ball 16 and an engaging groove 35 of the lock ball 16, and the lock mechanism is formed by mutual insertion of the socket 11 and the plug 31; In the fluid fitting 1, which is capable of connecting and disconnecting both of them through a lock, the locking mechanism is locked to the inner surface of the plug-side opening end of the sleeve 18 constituting a part of the locking mechanism provided in the socket 11. The tapered surface 18c for pressing the ball in the centripetal direction is formed to have a larger diameter toward the plug side, and the plug 3 The component force of the force which presses the lock ball which presses the taper angle (gamma) of the groove wall surface 35a by the side of the socket of the lock ball engagement groove 35 formed in 1) in the centripetal direction by the said taper surface 18c is a socket. At the same time, the plug 31 is formed at an angle suitable for firmly advancing the plug 31 in the inner direction, and the depth of the lock ball engagement groove 35 is adjusted when the socket 11 and the plug 31 are connected. The metal seal ring 36 is set to a dimension that does not contact the bottom surface, and the outer circumference of the tip portion 31a of the plug 31 is in contact with the socket 11 at the time of connection with the socket 11 and deforms when the temperature rises. The fluid fitting characterized in that the () is fitted.