JP7430864B2 - double coaxial connector - Google Patents

Description

The present invention relates to a coaxial connector (coaxial joint) having a concentric structure, and in particular to a quick connect type (quick connect type) double coaxial connector.

For example, during emergency operations at an accident site, work teams use hydraulic escape devices (spreaders, cutters, jacks, etc.) connected to the power distribution unit by end-to-end pipes. These pipes consist of pipes that supply the hydraulic escape device with pressurized oil from the hydraulic pump, and pipes that carry the low pressure drained oil to the reservoir of the pump. A so-called double coaxial structure in which these pipes are integrated and has an internal flow path and an external flow path arranged around the internal flow path is also used.

On the other hand, as for the technology related to the above-mentioned double coaxial pipes and hydraulic pumps, pipes and hydraulic escape devices, and double coaxial connectors (also referred to as "double coaxial couplers") that connect pipes, for example, the following patent document 1 is known.

Patent Document 1 discloses a coaxial fluid connector (hereinafter referred to as "connector") that defines a coaxial structure, that is, an internal fluid passageway and an external fluid passageway coaxially arranged around the internal fluid passageway. . The connector of Patent Document 1 will be explained based on FIGS. 10 to 13. As shown in FIGS. 10 and 11, the connector 100 is composed of a male part 300 and a female part 400, and the male part 300 and the female part 400 have internal fluid passages 301 and 401 for fluid, respectively. Two coaxial sections are formed that define external fluid passageways 302, 402. Here, in the connector 100, the internal fluid flowing from the hydraulic pump (not shown) toward the hydraulic escape device (not shown) flows from the female part 400 toward the male part 300, and External fluid flowing from the device toward the hydraulic pump flows from the male section 300 toward the female section 400 .

As shown in FIG. 10, the male part 300 includes a main body part 310 consisting of an inner coaxial part 311 in which an internal fluid passage 301 is formed and an outer coaxial part 312 including a through hole 313 in which an external fluid passage 302 is formed; A valve element 320 having a fin 321 movably incorporated in the direction of the axis 303 via a spring 323 is disposed on the side of the inner coaxial part 311 of the main body part 310 connected to the female part 400; A drawer 330 is provided between the portion 311 and the outer coaxial portion 312 and on the side connected to the female portion 400, and is movable in the direction of the axis 303 via a spring 332. Three protruding lugs 331 are formed at 120° intervals at the connecting end of the drawer 330. Therefore, the male part 300 has a four-layer structure including the valve body 320, the inner coaxial part 311, the drawer 330, and the outer coaxial part 312. Note that although a check valve 350 is incorporated inside the valve body 320, the check valve 350 is excluded from the calculation of the number of layers of the male part 300.

Further, a part of the inner coaxial part 311 has a two-layer structure of an inner partition part 314 and an outer partition part 315, and the outer partition part 315 has a proximal opening 316 and a distal opening 317 formed therein. ing. On the other hand, a steel ball housing 318 having a semicircular cross section is formed on the outer periphery of the outer coaxial portion 312 .

The valve body 320 and the inner coaxial portion 311 of the main body portion 310, the inner coaxial portion 311 of the main body portion 310 and the drawer 330, and the drawer 330 and the outer coaxial portion 312 of the main body portion 310 are in close contact with the sealing gaskets 340, 340, 340. .

On the other hand, as shown in FIG. 11, the female part 400 has an inner coaxial part 411 in which an internal fluid passage 401 is formed, and an outer coaxial part 412 including a through hole 413 in which an external fluid passage 402 is formed, Further, the connection side of the outer coaxial portion 412 with the male mold portion 300 has a main body portion 410 having an inner bush 414 and an outer bush 415 divided into two layers, and a gap between the inner coaxial portion 411 and the inner bush 414 of the main body portion 410. On the connection side, there is a drawer 420 that is incorporated so as to be movable in the direction of the axis 403 via a spring 421, and between the inner bush 414 and the outer bush 415 of the outer coaxial part 412 of the main body part 410, and the connection A memory ring 430 is incorporated on the side so as to be movable in the direction of the axis 403 via a spring 431, and a locking ring movable in the direction of the axis 403 via a spring 441 is provided on the outside of the outer coaxial portion 412 of the main body portion 410. It is composed of a ring 440. Therefore, the female part 400 has a total of six layers including an inner coaxial part 411, a drawer 420, an inner bush 414, a memory ring 430, an outer bush 415, and a locking ring 440.

The inner coaxial portion 411 of the main body portion 410 is closed on the side connected to the male mold portion 300, and a proximal opening 416 and a distal opening 417 are formed on the side surface of the inner coaxial portion 411. .

In addition, in a state in which the male part 300 is not connected, a through hole 442 is provided on the circumference of the outer bush 415 of the outer coaxial part 412 of the main body part 410 perpendicular to the direction of the axis 403 in the area where the memory ring 430 is present. A plurality of steel balls 450 are formed between the locking ring 440 and the locking ring 440 .

The drawer 420 and the inner coaxial portion 411 of the main body 410 and the inner bush 414 of the main body 410 and the drawer 420 are in close contact with the sealing gaskets 460, 460, 460.

As shown in FIG. 12 and FIG. 13, which is an enlarged view of the Z section of FIG. 400 and is pushed by the outer bush 415 of the female mold part 400 to move toward the hydraulic escape device, and the valve body 320 abuts the inner coaxial part 411 of the female mold part 400 and the female mold part 400 is pushed by the inner coaxial part 411 of the hydraulic escape device.

On the other hand, in the female mold part 400, the drawer 420 comes into contact with the inner coaxial part 311 of the male mold part 300 and is pushed by the inner coaxial part 311 of the male mold part 300 and moves toward the hydraulic pump, and the memory ring 430 moves toward the male mold part 300. It comes into contact with the outer coaxial part 312 of the mold part 300 and is pushed by the outer coaxial part 312 of the male mold part 300 to move toward the hydraulic pump.

Then, the outer coaxial part 312 of the male part 300 is inserted into the inner bushing 414 and the outer bushing 415 of the female part 400, and a steel ball housing 318 is formed on the outer periphery of the outer coaxial part 312 of the male part 300. The steel ball 450 enters into the locking ring 440 and the locking ring 440 moves toward the hydraulic escape device, thereby completing the connection between the male part 300 and the female part 400. Note that when connected, the axis 303 of the male part 300 and the axis 403 of the female part 400 are aligned.

As shown in FIGS. 12 and 13, internal fluid flows from female section 400 toward male section 300, and external fluid flows from male section 300 toward female section 400.

The internal fluid first flows through the internal fluid passageway 401 within the inner coaxial section 411 of the female part 400 (F1). Then, it exits from the distal opening 417 of the inner coaxial part 411 of the female part 400, and the space between the outer side of the inner coaxial part 411 of the female part 400 and the inner coaxial part 311 of the male part 300, the male part. The inner coaxial part 311 of the male part 300 passes through the space between the outer side of the valve body 320 of the part 300 and the inner coaxial part 311 of the male part 300, and from the space between the inner coaxial part 311 of the male part 300. (F3). As a result, the internal fluid passageway 401 of the female part 400 communicates with the internal fluid passageway 301 of the male part 300.

On the other hand, the external fluid enters the main body part 310 from the through hole 413 of the male part 300, flows from the external fluid passage 302 through the space between the outer coaxial part 312 and the drawer 330 (F4), and flows through the lugs of the male part 300. 331 and the inner bush 414 of the female part 400 (F5). Then, it passes through the distal opening 317 of the male part 300, through the space between the inner partition 314 and the outer partition 315, and exits from the proximal opening 316 (F6). Furthermore, it flows through the space between the outside of the inner coaxial part 311 of the male part 300 and the inner bush 414 of the female part 400, and the space between the drawer 420 and the inner bush 414 of the female part 400 (F7), Flows toward external fluid passageway 402 of female portion 400 . As a result, external fluid passageway 302 of male section 300 communicates with external fluid passageway 402 of female section 400 .

A coaxial structure, ie, a coaxial fluid connector defining an internal fluid passageway and an external fluid passageway concentrically disposed about the internal fluid passageway, is also disclosed in US Pat. In the coaxial fluid connector of Patent Document 2, the internal fluid flowing from the hydraulic pump toward the hydraulic escape device flows from the female part to the male part, and from the hydraulic escape device to the hydraulic pump. The external fluid flowing towards the male part flows towards the female part. As for the number of constituent members of the male part and the female part, the male part has a four-layer structure and the female part has a six-layer structure, as in Patent Document 1.

US Patent Application Publication No. 2018/0350548 Special Publication No. 2007-537412

By the way, the above-mentioned hydraulic escape device is very large, heavy and difficult to handle, so there is a need to make it smaller and lighter.To do this, the current hydraulic pressure of about 350 bar should be increased by 1.5 to 2 times to 500 bar to 700 bar. There is a demand for increasing the pressure by about twice as high. This demand for responding to higher voltages also applies to connectors. To accommodate higher pressure, it is necessary to increase the thickness of the steel that makes up the connector, which would result in a larger and heavier connector if the current structure was used. In other words, there is a trade-off between compatibility with high pressure, size reduction, and weight reduction. Therefore, in order to cope with higher pressure without increasing the size of the connector, it is necessary to reduce the number of constituent members of the male and female parts of the connector and simplify the layered structure. Note that there is a method of improving pressure resistance by changing the material, but this involves an extremely large increase in cost.

On the other hand, as is clear from FIG. 13, in the technique of Patent Document 1 mentioned above, the flow path of the external fluid is extremely meandering. In particular, the flow paths change approximately at right angles from F4 to F5 and from F5 to F6. As a result, there is a problem in that the back pressure in the external fluid flow path increases and it takes time to activate the actuator (for example, a hydraulic escape device).

As a result of extensive research, the inventor of the present invention reviewed the constituent members and shapes of the male and female parts, and changed the conventional method in which high-pressure internal fluid flows from the female part to the male part (low-pressure internal fluid flows from the female part to the male part). By reversing the direction (the external fluid flows from the male part to the female part), i.e., by allowing the high-pressure internal fluid to flow from the male part to the female part, the layered structure of the male part and the female part is created. We found that it can be simplified. At the same time, we also succeeded in shortening the activation time of the actuator by reducing the meandering of the flow path. Therefore, the present invention provides a dual coaxial connector that is compatible with high pressure, has a short start-up time, is small in size, lightweight, and low in cost.

The present invention according to claim 1 includes a male part and a female part that can be connected to each other, each of the male part and the female part having an internal fluid passage and a coaxial external fluid passage, and in the connected state. , an internal fluid passageway of the male part is in communication with an internal fluid passageway of the female part, and an external fluid passageway of the male part is in communication with an external fluid passageway of the female part, the male part being a dual coaxial connector. The mold section has a tubular section that extends axially and defines a proximal opening and a distal opening, and has a closed end to form an internal fluid passageway of the male mold section, and a tubular section that extends coaxially to the outside of the tubular section. a male high pressure sleeve having a protrusion formed with a through hole defining an external fluid passageway of the male portion in the axial direction; A plug spool that is movable and in contact with the male high-pressure sleeve through a sealing gasket; An external fluid passage of the male part is formed which communicates with the through hole formed in the protrusion of the male high pressure sleeve, and when it is not connected to the female part, it makes contact with the plug spool through the sealing gasket. the female part has an axially movable center spool and a plug coaxially disposed outside the center spool and extends axially to form an internal fluid passageway of the female part; When not connected to the male part, the female high-pressure sleeve contacts the center spool through a sealing gasket, and the female high-pressure sleeve is coaxially disposed outside the female high-pressure sleeve and is movable in the axial direction. In the uncoupled state, the socket spool contacts the female high-pressure sleeve via a sealing gasket, and the axially extending tubular portion and the axially female It has a protrusion in which a through hole is formed to define an external fluid passage of the mold part, and when it is not connected to the male mold part, it contacts the socket spool through a sealing gasket, and has a protrusion between it and the female high pressure sleeve. and a socket in which an external fluid passage is formed in the female part that communicates with the through hole, and a socket that is disposed coaxially on the outside of the tubular part of the socket and that when not connected to the male part, there is a steel plate between the socket spool and the socket. The plug spool in the male part, the center spool in the female part, and the socket spool are moved in the axial direction by a compression coil spring, and the locking ring in the female part and the socket spool are moved in the axial direction by a compression coil spring. A torsion coil spring is attached between the locking ring and the locking ring, which is rotatable by the torsion coil spring.The inner surface of the locking ring has a recess with an area wider than the diameter of the steel ball in the circumferential direction perpendicular to the axis. is formed, and an annular steel ball housing is formed on the outer surface of the plug of the male part in a direction perpendicular to the axis, and when the male part is not connected, the steel ball is connected to the locking part. The rotation of the locking ring is prevented by being placed in the recess of the ring, and the connection between the male part and the female part is achieved by the steel ball entering the steel ball housing of the male part and locking by the torsion coil spring. This is done by rotating the ring and fixing the steel ball by the inner surface of the locking ring other than the recess, and when the male part and the female part are connected, the internal fluid flows through the internal fluid passage of the male part. The dual coaxial connector is characterized in that the external fluid flows from the external fluid passageway of the female part to the external fluid passageway of the male part.

In the first aspect of the present invention, the male part has a three-layer structure including a male high-pressure sleeve, a plug spool, and a plug, and the female part has a three-layer structure including a female high-pressure sleeve, a center spool, a socket spool, a socket, and a locking ring. Since it has a five-layer structure, both the male part and the female part can have one less layer than the conventional structure. Furthermore, a fluid passage with extremely little meandering can be realized. Therefore, it is possible to provide a double coaxial connector that is compatible with high pressure, has a short start-up time, and is small, lightweight, and low cost.

Further, since the axial movement of the plug spool of the male part and the center spool and socket spool of the female part is performed by a compression coil spring, the connection between the male part and the female part is achieved by the contraction of the compression coil spring. The release can be performed using the force of the compression coil spring returning to its original state. Further, by returning the compression coil spring to its original state, the male part and the female part can return to the structure before connection when released.

Also, the relationship between the recess formed in the locking ring in the female part, the steel ball, the torsion coil spring, and the socket, and the steel ball housing formed on the outer surface of the plug in the male part during connection. Therefore, as the socket spool moves, the steel ball attached to the socket of the female part enters the steel ball housing of the plug of the male part, and the locking ring rotates. By fixing the steel ball by the inner surface other than the recess, the movement of the male part and the female part in the axial direction is automatically locked, and the male part and the female part can be connected.

According to the second aspect of the invention, the connection between the male part and the female part is released by rotating the locking ring in a direction opposite to the direction of rotation by the torsion coil spring and moving the steel ball into the recess of the locking ring. This is a dual coaxial connector.

In the second aspect of the present invention, when the locking ring is rotated in a direction opposite to the direction of rotation by the torsion coil spring, a recessed space is created above the steel ball by the rotation of the locking ring. As a result, the compression coil springs in the male and female parts move the steel ball to the recessed side of the locking ring using the force that returns to their original positions, and the lock between the steel ball and the steel ball housing is released, and the male part The connection between the part and the female part can be released.

In the locking ring of the female part, a through hole is formed on the side opposite to the connection side with the male part from the position where the torsion coil spring is disposed, and the socket of the female part is formed in the locking ring of the female part. A lock groove having a length on the circumference in a direction perpendicular to the axis is formed in a portion of the locking ring where the through hole is formed, and a lock groove that is inserted into the lock groove of the socket is formed in the through hole of the locking ring. It is a dual coaxial connector in which the pin is fixed and moves between one end and the other end of the locking groove of the socket when the male part and the female part are connected and unconnected.

In the present invention according to claim 3 , in the locking ring of the female part, a through hole is formed on the side opposite to the connection side with the male part from the position where the torsion coil spring is disposed, and the socket of the female part is formed. A lock groove having a length on the circumference in a direction perpendicular to the axis is formed in a portion of the locking ring where the through hole is formed, and a lock groove that is inserted into the lock groove of the socket is formed in the through hole of the locking ring. When the pin is fixed and the male part and the female part are connected and unconnected, the lock pin moves between one end and the other end of the locking groove of the socket, so that the male part and the female part are connected and unconnected. When connecting and uncoupling, the rotation range of the locking ring can be defined.

In the present invention as set forth in claim 4 , a key-shaped part is formed at one end of the locking groove of the socket on the side connected to the male part, and when the male part and the female part are connected, the locking ring is locked. It is a dual coaxial connector in which the pin moves into a keyed part.

In the double coaxial connector of the present invention, when the male part or the female part is rotated in a state where the male part and the female part are connected, some kind of If rotational force is transmitted to the locking ring via the steel balls for some reason, there is a structural possibility that the locking ring will rotate in the release direction.

In the present invention according to claim 4 , a key-shaped portion is formed at one end of the locking groove of the socket on the side connected to the male mold part, and when the male mold part and the female mold part are connected, the locking ring is locked. As the pin moves to the key-shaped part, the locking ring rotates and the lock pin enters the key-shaped part of the lock groove, so even if rotational force is transmitted to the locking ring through the steel ball, the locking ring will not rotate. Rotation in the release direction can be prevented.

Even if a key-shaped part is formed in the locking groove of the socket, the connection between the male part and the female part can be released by twisting the locking ring and rotating it in the opposite direction to the direction of rotation by the coil spring to lock the steel ball. This is done by moving the locking ring into the recessed part of the ring, but if a key-shaped part is formed, the locking ring is first moved in the axial direction, toward the male part, in order to make the locking ring rotatable. The action of escaping from the room is added.

The present invention according to claim 5 is a double coaxial connector in which, in the locking ring of the female part, the torsion coil spring is provided with an elastic element in the axial direction in addition to the torsion element. In the fifth aspect of the present invention, the torsion coil spring of the locking ring is provided with an axially expanding element in addition to the torsion element, so that when the male part and the female part are connected, the lock pin of the locking ring is However, the torsion coil spring can be automatically moved to the key-shaped portion by the force that extends in the axial direction.

The present invention as set forth in claim 6 provides a double coaxial connector in which, in the socket spool of the female part, an annular groove is formed on the side of the male part that contacts the plug, and a sealing gasket is installed in the groove. It is.

In the present invention according to claim 6 , in the socket spool of the female part, an annular groove is formed on the side of the male part that contacts the plug, and a sealing gasket is installed in the groove. At an intermediate stage leading to the connection of the male part and the female part, the plug spool of the male part comes into contact with the female high pressure sleeve of the male part and is pushed by the female high pressure sleeve to move toward the hydraulic pump. , the internal fluid tries to flow outward from the distal opening of the male high-pressure sleeve through the abutment surface of the plug spool of the male part and the female high-pressure sleeve, but not into the socket spool of the female part. A fitted sealing gasket can prevent the internal fluid from escaping towards the outside.

In the seventh aspect of the present invention, in the plug of the male part, an annular groove is formed at a position where the socket spool of the female part comes into contact with a sealing gasket attached to the side that contacts the plug of the male part. This is a dual coaxial connector.

In the seventh aspect of the present invention, in the plug of the male part, an annular groove is formed at a position where the socket spool of the female part comes into contact with a sealing gasket attached to the side of the socket spool that comes into contact with the plug of the male part. Since the annular groove can increase the contact area with the sealing gasket attached to the socket spool of the female part, the sealing gasket attached to the socket spool of the female part can prevent internal fluid from flowing. The reliability of preventing leakage to the outside can be improved.

The present invention according to claim 8 provides that, when the male part and the female part are in an uncoupled state, the internal fluid passage of the male part communicates with the external fluid passage of the male part through the proximal opening of the male high pressure sleeve. It is a double coaxial connector.

In the invention according to claim 8 , when the male part and the female part are in the uncoupled state, the internal fluid passage of the male part communicates with the external fluid passage of the male part by the proximal opening of the male high pressure sleeve. As a result, the hydraulic pump in the line to which the male part is connected can operate even if no hydraulic tool is connected. Therefore, even if the flow path direction is reversed from the conventional one, the same function as the conventional one can be maintained.

The male part has a three-layer structure consisting of a male high-pressure sleeve, plug spool and plug, and the female part has a five-layer structure including a female high-pressure sleeve, center spool, socket spool, socket and locking ring. Both the female part and the female part can be constructed with one layer less than the conventional structure. Furthermore, a fluid passage with extremely little meandering can be realized. As a result, it is possible to provide a double coaxial connector that is compatible with higher voltages, has a shorter start-up time, and is small, lightweight, and low cost.

FIG. 2 is a front view of a double coaxial connector in an embodiment of the present invention, and illustrates the connection between the hydraulic pump side and the hydraulic tool side in a non-coupled position. It is a front view of the male part of the double coaxial connector in the embodiment of the present invention when it is not connected, and the upper half is a sectional view. FIG. 3 is a side view of the male part in FIG. 2 seen from the connection side with the female part. It is a front view of the female part of the double coaxial connector in embodiment of this invention, and an upper half is sectional drawing. 5 is a side view of the female part in FIG. 4 seen from the connection side with the male part, and the upper half is a sectional view taken along line AA in FIG. 4. FIG. FIG. 3 is a front cross-sectional view of the male part and the female part of the double coaxial connector in an unconnected state in an embodiment of the present invention. FIG. 2 is a front cross-sectional view of a connected state of a male part and a female part of a double coaxial connector in an embodiment of the present invention. (a) is a lock groove formed in the socket of the female part in the embodiment of the present invention, and (b) is a modification of (a). FIG. 8(b) is a front sectional view of the upper half of the double coaxial connector in a state where the male part and the female part are connected when using FIG. 8(b). It is a front sectional view of the female part of the conventional connector (patent document 1). It is a front sectional view of the male part of the conventional connector (patent document 1). It is a front sectional view of a connected state of a female part and a male part of a conventional connector (Patent Document 1). 13 is an enlarged view of the Z section in FIG. 12. FIG.

Embodiments of the present invention will be described based on FIGS. 1 to 7 and FIG. 8(a). FIG. 1 shows a double coaxial connector 1 (uncoupled state) making it possible to connect two lines A1 and B1 for connecting a hydraulic tool (not shown) to a hydraulic pump (not shown). The two lines each have a coaxial structure and define an internal fluid passage A2, an internal fluid passage B2, an external fluid passage A3, and an external fluid passage B3, which are annular and the external fluid passage is different from the internal fluid passage. coaxially surrounds.

Internal fluid passage A2 and internal fluid passage B2 correspond to high pressure passages, i.e. passages for supplying the hydraulic tool, while external fluid passage A3 and external fluid passage B3 are low pressure passages towards the reservoir of the hydraulic pump. This corresponds to the fluid that is discharged. The fluid may be, for example, oil or water having a high pressure, in particular of the order of 350 bar to 700 bar. In this embodiment, oil was used.

The double coaxial connector 1 consists of a male part 3 fixed to the end of line A1 connected to a hydraulic pump and a female part 4 fixed to the end of line B1 connected to a hydraulic tool. .

As shown in FIGS. 2 and 3, the male part 3 of the double coaxial connector 1 has a tubular shape centered on the axis X1. The male part 3 of the double coaxial connector 1 has a tubular part 13 that extends in the innermost direction toward the connection side in the axis X1 direction and forms an internal fluid passage A2, and a hydraulic pump side of the tubular part 13 that extends perpendicularly to the axis X1. A male high-pressure sleeve 10 is provided which has a protrusion 14 that protrudes outward in the direction and has a plurality of through holes 15 coaxially formed on the outside of the tubular portion 13 .

The tubular portion 13 of the male high-pressure sleeve 10 is formed so that its diameter narrows in three steps toward the connecting side, and the connecting side with the female portion 4 is closed. Further, the tubular portion 13 is formed with a distal opening 11 on the connection side and a proximal opening 12 on the hydraulic pump side of the distal opening 11. In this embodiment, four distal openings 11 and four proximal openings 12 are formed at 90° intervals. However, the number formed is not limited to this.

On the connecting side surface of the protrusion 14 on the axis X1 side from the through hole 15, there is an annular groove 16 for accommodating the end of a compression coil spring 21 that allows a plug spool 20 of the male part 3 to be moved in the axis X1 direction, which will be described later. It is formed. Further, a threaded portion 17 is formed at the outermost portion of the protrusion 14 .

A plug spool 20 is disposed coaxially with the male high-pressure sleeve 10 on the outside of the tubular portion 13 of the male high-pressure sleeve 10 . An annular first groove 22 and a second groove 23 are formed in a direction perpendicular to the axis X1 on the tubular part 13 side of the male high-pressure sleeve 10 of the plug spool 20, and are attached to the first groove 22 and the second groove 23. The male high-pressure sleeve 10 is in close contact with the outer surface of the tubular portion 13 of the male high-pressure sleeve 10 via a first sealing gasket 24 and a second sealing gasket 25. Further, the plug spool 20 can be moved in the direction of the axis X1 by a compression coil spring 21.

The plug spool 20 is formed along the shape of the connecting side of the plug 30 of the male part 3 described later, and the plug spool 20 is formed with fins 26 that extend toward the hydraulic pump side. In the plug spool 20 and the tubular portion 13 of the male high-pressure sleeve 10, when the male portion 3 and the female portion 4 are in an uncoupled state, the distal opening 11 of the tubular portion 13 of the male high-pressure sleeve 10 is connected to the plug spool. It is closed by 20 first sealing gaskets 24 and second sealing gaskets 25.

A plug 30 is disposed coaxially with the plug spool 20 and outside the protrusion 14 of the male high-pressure sleeve 10 and connected to the protrusion 14 of the male high-pressure sleeve 10 . The connecting surface of the protrusion 14 of the male high-pressure sleeve 10 is formed with a thread shape that corresponds to the threaded portion 17 formed on the outermost side of the protrusion 14 of the male high-pressure sleeve 10 .

On the other hand, a third groove 31 is formed in an annular shape on the plug spool 20 side of the plug 30 and substantially perpendicular to the axis X1 of the second groove 23 formed in the plug spool 20. The plug spool 20 is in close contact with the outer surface of the plug spool 20 via a third sealing gasket 32 attached to the plug spool 20 . On the other hand, the portions of the plug spool 20 corresponding to the fins 26 are hollowed out along the shape of the fins 26, and are thinner than the portions that are in close contact with the plug spool 20.

Further, an annular steel ball housing 33 is formed on the outer surface of the plug 30 in a direction perpendicular to the axis X1.

Furthermore, in the plug 30, a fifth sealing gasket 74 attached to an annular fifth groove 72 formed in a socket spool 70 of the female part 4, which will be described later, is used when the male part 3 and the female part 4 are connected. An annular groove (V groove 35) having a V-shaped cross section is formed at the contact position.

To assemble the male part 3, first, the third sealing gasket 32 is attached to the third groove 31 of the plug 30. After attaching the first sealing gasket 24 and the second sealing gasket 25 to the first groove 22 and second groove 23 of the plug spool 20, the plug spool 20 is inserted into the plug 30. This brings the plug 30 and plug spool 20 into close contact.

Next, the compression coil spring 21 is inserted into the tubular portion 13 of the male high-pressure sleeve 10 from the connection side, and the tip of the compression coil spring 21 is inserted into the groove 16. Then, the tubular part 13 of the male high-pressure sleeve 10 is inserted into the plug spool 20 from the hydraulic pump side, and the threaded part 17 of the protrusion 14 of the male high-pressure sleeve 10 is screwed to the plug 30. and the plug 30 are connected.

As a result, when disconnected from the female part 4, the male high-pressure sleeve 10, the plug spool 20, and the plug 30 are substantially flush on the connection side, completing the three-layered male part 3. Then, an internal fluid passage A2 is formed in the tubular part 13 of the male high-pressure sleeve 10, and a space between the plug 30 and the tubular part 13 of the male high-pressure sleeve 10 and a through hole of the protrusion 14 of the male high-pressure sleeve 10. 15 communicate with each other to form an external fluid passage A3.

Note that when the female part 4 is not connected, the internal fluid passage A2 communicates with the external fluid passage A3 via the proximal opening 12 of the tubular part 13 of the male high-pressure sleeve 10. As a result, the hydraulic pump (not shown) to which the line A1 to which the male part 3 is connected can be operated even if no hydraulic tool (not shown) is connected.

Next, as shown in FIG. 4, the female part 4 of the double coaxial connector 1 has a tubular shape centered on the axis X2. The female part 4 of the double coaxial connector 1 is provided with a tubular female high-pressure sleeve 40 that extends in the direction of the axis X2 and forms an internal fluid passage B2.

The connecting side of the female high-pressure sleeve 40 is thick on both the inside and outside, and the portion where the thickness changes smoothly connects. Further, a fourth groove 41 is formed inside, and a fourth sealing gasket 42 is attached.

On the other hand, the outer side of the female high-pressure sleeve 40 on the hydraulic tool side is formed thin so that a protrusion 82 of a socket 80, which will be described later, can be disposed thereon. Further, a threaded portion 43 is formed for a round nut 45 that is disposed on the hydraulic tool side of the protrusion 82 of the socket 80 and fixes the socket 80 from the hydraulic tool side. Furthermore, an annular recess 44 is formed in the inner surface of the female high-pressure sleeve 40 on the hydraulic tool side in a direction perpendicular to the axis X2.

A center spool 50 is coaxially disposed inside the female high-pressure sleeve 40 on the connection side. A through hole 51 extending from the connection side to the hydraulic tool side is formed inside the center spool 50. A check housing 60 is coaxially attached to the connection side of the through hole 51 of the center spool 50 via a steel ball 62 and a compression coil spring 61.

The check housing 60 opens the internal fluid passage B2 when the male part 3 and female part 4 of the double coaxial connector 1 are disconnected, allowing the hydraulic tool to be manually returned to its original shape. It is something to do. When the steel ball 62 is pushed from the connection side using a special tool, the compression coil spring 61 is compressed, the connection side of the check housing 60 is opened, and the connection side and the internal fluid passage B2 are communicated with each other.

The connecting side of the center spool 50 is closely connected to the female high pressure sleeve 40 via the fourth sealing gasket 42 of the female high pressure sleeve 40. Further, a guide portion 52 is formed on the outer surface of the center spool 50 and follows the inner shape of the female high-pressure sleeve 40 . The center spool 50 is movable toward the hydraulic tool side in the axis X2 direction by a compression coil spring 53, and the spring seat 54 on the hydraulic tool side is C-shaped for a hole attached to the recess 44 of the female high pressure sleeve 40. It is fixed by a retaining ring 46.

A socket spool 70 is coaxially disposed on the outer side of the female high-pressure sleeve 40 on the connection side. The socket spool 70 is movable in the direction of the axis X2 by a compression coil spring 71. A fifth annular groove 72 is formed on the inside of the connection side of the socket spool 70 in a direction perpendicular to the axis X2 direction, and a fifth sealing gasket 74 installed therein prevents the outer side of the female high pressure sleeve 40. Close to the sides.

Further, a sixth groove 73 is formed in a portion corresponding to the V groove 35 formed in the plug 30 of the male part 3 on the connection side of the socket spool 70, and a sixth sealing gasket 75 is inserted in the sixth groove 73. installed.

A socket 80 is coaxially disposed outside the socket spool 70. The socket 80 includes a tubular portion 81 extending in the axis X2 direction and forming an external fluid passage B3 with the outer surface of the female high-pressure sleeve 40, and a through hole protruding inward on the hydraulic tool side of the tubular portion 81. It is composed of a protrusion 82 having a projection 83 formed therein. The through hole 83 of the protrusion 82 communicates with the external fluid passage B3.

An annular eighth groove 86 is formed on the outer surface of the connection side of the socket 80 in a direction perpendicular to the axis X2. On the hydraulic tool side of the eighth groove 86, six through holes 83 are formed at 60° intervals on the circumference in the direction perpendicular to the axis X2, and a steel ball 92 is installed in the through holes 83 ( Figure 5). However, the number formed is not limited to this.

A seventh annular groove 84 is formed in the inner surface of the through hole 83 of the socket 80 on the hydraulic tool side in a direction perpendicular to the axis X2. in close contact with the outer surface of

As shown in FIG. 8(a), the outer surface of the socket 80 is perpendicular to the axis X2, into which the tip of a bolt 94, which is a lock pin fixed to a locking ring 90 (described later), is inserted. A lock groove 89 having a constant length is formed in the lock groove 89 .

A locking ring 90 is coaxially disposed outside the socket 80. A torsion coil spring 91 is disposed in the locking ring 90 and the socket 80, and the locking ring 90 is rotatable in a direction parallel to the axis X2. Further, a recess 93 having an arc shape having a wider area than the diameter of the steel ball 92 in the circumferential direction is formed in the locking ring 90 (FIG. 5). In FIG. 5, the locking ring 90 is urged to rotate in the direction of the arrow by a torsion coil spring 91, but the rotation is prevented by a steel ball 92. Further, a threaded through hole 95 is formed in a portion corresponding to the lock groove 89 formed on the outside of the socket 80, and a bolt 94, which is a lock pin, is fixed to the through hole 95.

As shown in FIG. 5, the through hole 95 of the locking ring 90 is formed approximately in the middle between the recesses 93 (in FIG. 5, a bolt 94, which is a lock pin, is also shown). Although details will be described later, the male mold part 3 and the female mold part 4 are attached and detached by moving the steel ball 92 in and out of the recess 93. Therefore, the length of the lock groove 89 of the socket 80 formed on the circumference in the direction perpendicular to the axis needs to be formed in a region where the steel ball 92 can reliably enter and exit the recess 93.

In this embodiment, the lock groove 89 is formed in a region where the bolt 94, which is a lock pin, can move from the middle between the recesses 93 to the position above the steel ball 92. Further, the width of the lock groove 89 is made wider than the bolt 94, which is a lock pin, so that the bolt 94 can move smoothly within the lock groove 89.

To assemble the female part 4, first, the check housing 60 into which the steel ball 62 and the compression coil spring 61 are inserted is attached to the center spool 50. Then, the fourth sealing gasket 42 is attached to the fourth groove 41 of the female high pressure sleeve 40, and the center spool 50 is inserted. After inserting the compression coil spring 53 from the hydraulic tool side of the center spool 50, insert the spring seat 54, insert the C-shaped retaining ring 46 for the hole into the hydraulic tool side of the spring seat 54, and then insert the spring seat 54 and the compression coil spring 53. Fix the hydraulic tool side.

Next, a fifth sealing gasket 74 is attached to the fifth groove 72 of the socket spool 70, and a sixth sealing gasket 75 is attached to the sixth groove 73, and attached to the outside of the female high pressure sleeve 40. Furthermore, the compression coil spring 71 is inserted from the hydraulic tool side of the socket spool 70.

Next, the seventh sealing gasket 85 is attached to the seventh groove 84 of the socket 80, the socket 80 is inserted from the hydraulic tool side to the outside of the socket spool 70, and the round nut 45 is tightened on the threaded part 43 of the female high pressure sleeve 40. to fix the socket 80. Then, a steel ball 92 is inserted into the through hole 83.

Next, a torsion coil spring 91 is inserted into the outside of the socket 80, and a locking ring 90 is attached from the connection side. Then, the locking ring 90 and the socket 80 are positioned by a bolt 94, which is a lock pin, in a lock groove 89 formed on the outside of the socket 80. Finally, a concentric retaining ring 87 is attached to the connecting side end surface of the locking ring 90 via a washer 88 in the eighth groove 86 of the socket 80. At this time, a force is applied to the locking ring 90 by the torsion coil spring 91 in the direction of the arrow shown in FIG. movement has been stopped. Further, the bolt 94, which is a lock pin, is located near one (upper) end of the lock groove 89, as shown in FIG. 8(a).

As a result, when not connected to the male part 3, the center spool 50, the female high pressure sleeve 40, the socket spool 70, and the socket 80 are almost flush on the connection side, and together with the outermost locking ring 90, A female mold part 4 having a five-layer structure is completed. Note that, based on the same concept as in the background art, the check housing 60 was excluded from the calculation of the number of layers of the female mold part 4.

FIG. 6 is a diagram of the male part 3 and female part 4 of the double coaxial connector 1 before they are connected. In this state, the internal fluid passage A2 communicates with the external fluid passage A3 via the proximal opening 12 of the tubular portion 13 of the male high pressure sleeve 10, as indicated by the arrow in the figure. Therefore, the hydraulic pump (not shown) connected to the line A1 to which the male part 3 is connected can operate even if the hydraulic tool (not shown) is not connected.

FIG. 7 is a diagram showing a state in which the male part 3 and the female part 4 of the double coaxial connector 1 are connected, and the axis X1 of the male part 3 and the axis X2 of the female part 4 coincide. As shown in FIG. 7, the plug spool 20 of the male part 3 comes into contact with the female high pressure sleeve 40 of the male part 3 and is pushed by the female high pressure sleeve 40, causing the compression coil spring 21 to contract, thereby causing the hydraulic pump side Move to. Also, the center spool 50 of the female part 4 comes into contact with the male high pressure sleeve 10 of the male part 3 and is pushed by the male high pressure sleeve 10 of the male part 3, causing the compression coil spring 53 to contract, thereby causing the hydraulic tool side Move to. As a result, in the male high pressure sleeve 10, the proximal opening 12 is closed by the plug spool 20, the distal opening 11 is opened, and the inside of the female high pressure sleeve 40 of the female part 4 and the male high pressure A space is created between the sleeve 10 and the inner side of the female high pressure sleeve 40 and the center spool 50 of the female part 4.

On the other hand, the socket spool 70 of the female part 4 contacts the plug 30 of the male part 3 and is pushed by the plug 30 of the male part 3, causing the compression coil spring 71 to contract and move toward the hydraulic tool. As a result, a space is created between the female high pressure sleeve 40 and the socket spool 70 and between the female high pressure sleeve 40 and the plug 30 of the male part 3.

Further, as the socket spool 70 moves, the steel ball 92 attached to the socket 80 of the female part 4 enters the steel ball housing 33 of the plug 30 of the male part 3, and the locking ring 90 rotates, causing the locking ring to rotate. The steel ball 92 is fixed by the inner surface of the ring 90 other than the recess 93. At this time, the bolt 94, which is a lock pin, moves in the direction of the arrow shown in FIG. 8(a), and the other end of the lock groove 89 formed in the socket 80 (lower end in FIG. 8(a)) The rotation of the locking ring 90 is stopped by coming into contact with the locking ring 90 . As a result, the movement of the male part 3 and the female part 4 in the axial direction is automatically locked, and the connection between the male part 3 and the female part 4 is completed.

Therefore, the internal fluid passage A2 of the internal fluid exits from the distal opening 11 of the male high pressure sleeve 10 and connects to the inside of the male high pressure sleeve 10 of the male part 3 and the female high pressure sleeve 40 of the female part 4. , communicates with the internal fluid passage B2 in the female high-pressure sleeve 40 via a flow path A4 in the space between the inside of the female high-pressure sleeve 40 and the center spool 50 of the female part 4.

On the other hand, the external fluid passage B3 for external fluid is connected between the outside of the female high pressure sleeve 40 and the socket spool 70, between the outside of the female high pressure sleeve 40 and the inside of the plug 30 of the male part 3, and between the outside of the female high pressure sleeve 40 and the inside of the plug 30 of the male part 3. It communicates with the external fluid passage A3 of the male mold part 3 through a flow path B4 in the space between the inside of the plug 30 of the mold part 3 and the plug spool 20 without significantly meandering.

In addition, at an intermediate stage leading to connection of the male part 3 and the female part 4, the plug spool 20 of the male part 3 comes into contact with the female high pressure sleeve 40 of the female part 4, and also contacts the female high pressure sleeve 40. When pushed and moved toward the hydraulic pump, the internal fluid flows from the distal opening 11 of the male high-pressure sleeve 10 through the abutment surface between the plug spool 20 of the male part 3 and the female high-pressure sleeve 40. It may leak outward. This occurs especially when connecting the male part 3 and the female part 4 slowly. In this embodiment, since the sixth sealing gasket 75 is attached to the socket spool 70 of the female part 4, this sixth sealing gasket 75 prevents the internal fluid from flowing outward. can.

On the other hand, when releasing the connection between the male part 3 and the female part 4, the locking ring 90 of the female part 4 is rotated in the opposite direction to the arrow in FIG. At this time, the bolt 94, which is a lock pin, moves in the direction opposite to the arrow shown in FIG. 8(a), and the end of the lock groove 89 formed in the socket 80 (the upper end in FIG. 8(a)) When the locking ring 90 comes into contact with the locking ring 90, the rotation of the locking ring 90 stops. At the same time, the steel ball 92 comes to the position of the recess 93 of the locking ring 90. Since the space of the recess 93 is created above the steel ball 92, the plug 30 of the male part 3 is pushed toward the hydraulic pump by the force of the compression coil spring 71 of the socket spool 70 of the female part 4, which had been compressed, returning to its original state. At the same time, the steel ball 92 comes out of the steel ball housing 33 of the plug 30 of the male part 3, and the male part 3 and the female part 4 are unlocked. As a result, the female mold part 4 can be moved toward the hydraulic tool side, and the connection between the male mold part 3 and the female mold part 4 is released.

When the plug 30 of the male part 3 is removed, the socket spool 70 of the female part 4 returns to its original position, and the steel ball 92 is held in the recess 93 of the locking ring 90 when not connected. Further, the plug spool 20 of the male part 3 and the center spool 50 of the female part 4 also return to their original positions, so both the male part 3 and the female part 4 return to their state (structure) before they were connected.

As mentioned above, the male part 3 can be made up of three layers: the male high pressure sleeve 10, the plug spool 20, and the plug 30, and the female part 4 can be made up of the female high pressure sleeve 40, the center spool 50, the socket spool 70, and the socket. 80 and the locking ring 90, both the male part 3 and the female part 4 can have one less layer than the conventional structure. Moreover, a fluid passage with extremely little meandering can be realized. Therefore, it is possible to provide a double coaxial connector 1 that is compatible with high pressure, has a short startup time, and is small, lightweight, and low cost.

Next, as a modification of the lock groove 89 formed in the socket 80, a case using FIG. 8(b) will be described in conjunction with FIG. The lock groove 89 formed in the socket 80 in FIG. 8(b) is located at one end of the lock groove 89 shown in FIG. 8(a), that is, when the male part 3 and the female part 4 are connected. A key-shaped portion 96 is formed on the side connected to the male mold portion 3, continuing from the end portion where the locking ring 90 rotates. In addition, the above-mentioned torsion coil spring 91 is provided with a compression spring element (an element that enables movement in the axial direction), and when it is not connected to the male part 3, it is assembled in a compressed state. It is attached.

When the male part 3 and the female part 4 are connected, as in the above case, the steel ball 92 attached to the socket 80 of the female part 4 moves to the male part as the socket spool 70 moves. It enters the steel ball housing 33 of the plug 30 of No. 3, and the locking ring 90 rotates. As shown in FIG. 8(b), the locking ring 90 rotates when the bolt 94, which is a locking pin, first moves circumferentially in a direction perpendicular to the axis and comes into contact with the end. Stop. At the same time, the bolt 94, which is a lock pin, moves inside the key-shaped part 96 toward the male part 3 due to the force of the torsion coil spring 91, which is provided with a compression spring element (an element that enables movement in the axial direction), and extends in the axial direction. (to the hydraulic pump side) automatically. As a result, the connection between the male part 3 and the female part 4 is completed (FIG. 9).

Note that if a torsion coil spring 91 with a compression spring element (an element that enables movement in the axial direction) is not used, the locking ring 90 rotates and the bolt 94, which is a locking pin, temporarily After moving circumferentially in a direction perpendicular to the axis and abutting the end, the locking ring 90 is manually moved in the axial direction toward the hydraulic pump side, and the bolt 94, which is a lock pin, is moved to the key-shaped part 96. .

On the other hand, when releasing the connection between the male part 3 and the female part 4, first, the locking ring 90 is moved in the axial direction in the opposite direction to the male part 3 (toward the hydraulic tool side). When the locking ring 90 stops moving in the axial direction, the bolt 94, which is the locking pin, has completely come out of the key-shaped portion 96.

Thereafter, the locking ring 90 of the female mold part 4 is rotated in the opposite direction to the arrow in FIG. 5, similarly to the case where FIG. 8(a) is used as the locking groove 89. At this time, the bolt 94, which is a lock pin, moves in the opposite direction to the arrow shown in FIG. 8(b), and the end of the lock groove 89 formed in the socket 80 (the upper end in FIG. 8(b)) When the locking ring 90 comes into contact with the locking ring 90, the rotation of the locking ring 90 stops. At the same time, the steel ball 92 comes to the position of the recess 93 of the locking ring 90. Since the space of the recess 93 is created above the steel ball 92, the plug 30 of the male part 3 is pushed toward the hydraulic pump by the force of the compression coil spring 71 of the socket spool 70 of the female part 4, which had been compressed, returning to its original state. At the same time, the steel ball 92 comes out of the steel ball housing 33 of the plug 30 of the male part 3, and the male part 3 and the female part 4 are unlocked. As a result, the female mold part 4 can be moved toward the hydraulic tool side, and the connection between the male mold part 3 and the female mold part 4 is released.

Note that the implementation of the present invention is not limited to the above-described embodiments, and various changes can be made without departing from the purpose of the present invention.

1 Double coaxial connector 3 Male part 4 Female part 10 Male high pressure sleeve 11 Distal opening 12 Proximal opening 13 Tubular part 14 Projection 20 Plug spool 21 Compression coil spring 26 Fin 30 Plug 33 Steel ball housing 40 Female Type high pressure sleeve 45 Round nut 50 Center spool 53 Compression coil spring 54 Spring seat 60 Check housing 70 Socket spool 71 Compression coil spring 80 Socket 81 Tubular portion 82 Projection 89 Lock groove 90 Locking ring 91 Torsion coil spring 92 Steel ball 93 Recess 94 Bolt (lock) pin)
95 Through hole 96 Key-shaped part

Claims (8)

Equipped with a male part and a female part that can be connected to each other,
the male portion and the female portion each have an internal fluid passageway and a coaxial external fluid passageway;
In the coupled state, the internal fluid passage of the male part is in communication with the internal fluid passage of the female part, and the external fluid passage of the male part is in communication with the external fluid passage of the female part. A coaxial connector,
The male part is
a tubular portion extending axially and defining a proximal opening and a distal opening and having a closed end defining an internal fluid passageway of the male portion and coaxially formed outside the tubular portion; , a male high-pressure sleeve having a protrusion formed with a through hole defining an external fluid passage of the male portion in the axial direction;
a plug spool coaxially disposed outside the tubular portion of the male high-pressure sleeve, movable in the axial direction, and in contact with the male high-pressure sleeve via a sealing gasket;
coaxially disposed outside the plug spool and outside the protrusion of the male high-pressure sleeve , between the tubular portion of the male high-pressure sleeve and the protrusion of the male high-pressure sleeve ; an external fluid passage of the male part is formed that communicates with the formed through hole, and has a plug that contacts the plug spool via a sealing gasket when not connected to the female part;
The female part is
a center spool that is movable in the axial direction;
Disposed coaxially on the outside of the center spool, extending in the axial direction to form an internal fluid passage of the female part, and in a state where it is not connected to the male part, is connected to the center spool through a sealing gasket. a female high pressure sleeve in contact;
a socket spool disposed coaxially outside the female high-pressure sleeve, movable in the axial direction, and in contact with the female high-pressure sleeve via a sealing gasket when not connected to the male part; ,
a protrusion disposed coaxially on the outside of the socket spool and the outside of the female high-pressure sleeve, the protrusion having a tubular portion extending in the axial direction and a through hole defining an external fluid passage of the female portion in the axial direction; and an external fluid of the female part that is in contact with the socket spool through a sealing gasket and communicates with the female high pressure sleeve and with the through hole when it is not connected to the male part. a socket in which a passage is formed;
a locking ring disposed coaxially on the outside of the tubular part of the socket, and in which a steel ball is disposed between the locking ring and the socket spool when the socket is not connected to the male part;
The axial movement of the plug spool of the male part and the center spool and socket spool of the female part is performed by a compression coil spring,
A torsion coil spring is attached between the locking ring and the socket of the female part, and the locking ring is rotatable by the torsion coil spring,
A recess having an area wider than the diameter of the steel ball in a circumferential direction perpendicular to the axis is formed on the inner surface of the locking ring,
An annular steel ball housing is formed on an outer surface of the plug of the male part in a direction perpendicular to the axis;
When the steel ball is disposed in the concave portion of the locking ring in a state in which it is not connected to the male portion, the locking ring is prevented from rotating;
The connection between the male part and the female part is such that the steel ball enters the steel ball housing of the male part, and the locking ring is rotated by the torsion coil spring so that the locking ring is connected to the recessed part of the locking ring. carried out by fixing the steel ball by the inner surface,
In the connected state of the male part and the female part, internal fluid flows from the internal fluid passage of the male part in the direction of the internal fluid passage of the female part, and external fluid flows from the external fluid of the female part. A dual coaxial connector characterized in that fluid flows from the passageway in the direction of the external fluid passageway of the male portion. The connection between the male part and the female part is released by rotating the locking ring in a direction opposite to the direction in which it can be rotated by the torsion coil spring and moving the steel ball to the recess of the locking ring. The dual coaxial connector according to claim 1 , wherein the dual coaxial connector is In the locking ring of the female part, a through hole is formed on the side opposite to the connection side with the male part from the position where the torsion coil spring is disposed,
In the socket of the female part, a lock groove having a length on the circumference in a direction perpendicular to the axis is formed in a portion of the locking ring where the through hole is formed;
A lock pin inserted into the lock groove of the socket is fixed to the through hole of the locking ring,
3. The lock pin moves between one end and the other end of the lock groove of the socket when the male part and the female part are connected and unconnected . Double coaxial connector. A key-shaped portion is formed at one end of the lock groove of the socket on a side connected to the male portion,
4. The double coaxial connector according to claim 3 , wherein the locking pin of the locking ring moves to the key-shaped part when the male part and the female part are connected. 5. The double coaxial connector according to claim 4 , wherein in the locking ring of the female part, the torsion coil spring is provided with an axially expandable element in addition to a torsion element. In the socket spool of the female part, an annular groove is formed on the side of the male part that contacts the plug, and a sealing gasket is installed in the groove. The double coaxial connector according to any one of the above. In the plug of the male part, an annular groove is formed at a position where the socket spool of the female part comes into contact with a sealing gasket attached to a side of the male part that comes into contact with the plug. 7. The dual coaxial connector according to claim 6 . In the uncoupled state of the male portion and the female portion, the internal fluid passageway of the male portion is in communication with the external fluid passageway of the male portion by the proximal opening of the male high pressure sleeve. The double coaxial connector according to any one of claims 1 to 7 .

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