JP2005249029A - Fluid coupling - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To secure the operation and further decrease a residual quantity of fluid in a fluid bearing preventing liquid from dripping. <P>SOLUTION: A socket 1 has a cylindrical socket opening and closing valve 4 in a socket body 7. A blade piece 15 brought into sliding contact with the inner surface of the socket opening and closing valve 4 is provided on the outer periphery of a spindle 11 inside the socket opening and closing valve 4. A plug 2 has a plug opening and closing valve 6 in a plug body 23, and a blade piece 27 brought into sliding contact with the inner surface of the plug body 23 is provided on the outer periphery thereof. When a passage 3 of the socket is closed by the socket opening and closing valve 4, a tip sealing member 10 mounted on the inner surface of the socket body is brought into contact with the outer periphery of the forward end part of the socket opening and closing valve 4, and an inner sealing member 9 brought into contact with the inner surface of the socket body 7 is provided on the outer periphery of the socket opening and closing valve 4 inside the tip sealing member 10. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a fluid coupling that connects pipe lines, and more particularly, to a fluid coupling that prevents liquid dripping when separating.

  Various fluid couplings are known that prevent flow sagging when separated (see, for example, Patent Document 1). This type of fluid coupling has a socket and a plug inserted into the socket. A socket on-off valve and a plug on-off valve are provided in the socket and the plug, respectively. The passage and the plug-side flow path are respectively closed, and when the socket and the plug are connected, the socket on-off valve and the plug on-off valve are automatically opened to communicate with each other.

  When connecting the socket and the plug, the socket opening / closing valve contacts the tip of the plug and moves in the valve opening direction, while the plug opening / closing valve contacts the valve shaft provided in the socket and moves in the valve opening direction. However, the plug on / off valve and valve shaft are usually unstable because the base end is only supported and the tip is not supported in the socket or plug, so when the socket and plug are separated. In addition, the on / off valves may be insufficiently closed or the operation may be uncertain. In addition, since the valve shaft must be attached using a small nut, the assembly is troublesome.

Further, a seal member such as an O-ring is provided on the socket side, and the tip corner of the plug is usually rounded and chamfered so as not to damage the O-ring when the plug is inserted into the socket. However, when such a chamfered portion is provided, the amount of residual fluid that flows between the tip of the plug and the tip of the socket opening / closing valve increases, causing dripping.
Utility Model Registration No. 2604307 (FIGS. 1, 2, and 4)

  The problem to be solved by the present invention is that in a fluid coupling that has a socket and a plug with a built-in on-off valve to prevent dripping, each on-off valve is surely opened and closed, the operation is stable, and assembly is easy. Another object of the present invention is to provide a fluid coupling capable of extremely reducing the amount of residual fluid.

  According to the present invention, there is provided a socket and a plug, and the socket is provided movably on the outer periphery of the spindle so as to open and close a spindle provided in the socket body and a flow path on the socket side so as to face the plug. In the fluid coupling comprising a plug on-off valve provided in a plug main body so as to be movable in the plug body so as to open and close a plug-side flow path facing the spindle. The fluid coupling is characterized in that a wing piece slidably contacting the inner surface of the socket on-off valve is formed on the outer periphery of the socket, and a wing piece slidably contacting the inner surface of the plug body is formed on the outer periphery of the plug on-off valve. Provided to solve the above problems.

  Further, according to the present invention, when the socket on-off valve closes the flow path, a tip seal member that presses against the outer periphery of the tip end of the socket on-off valve is provided on the inner surface of the socket main body, The fluid coupling is provided in which an inner seal member that presses against the inner surface of the socket main body is provided on the outer periphery of the socket opening / closing valve on the inner side from the tip, thereby solving the above-described problem.

  The present invention is configured as described above, and a blade piece is formed on each of the outer periphery of the spindle provided in the socket body and the plug opening / closing valve provided in the plug body, and the spindle and the plug opening / closing valve are formed by the blade pieces. It will not be shaken or bent due to vibration or impact, etc., and will be kept in a stable state, so that the socket on-off valve and plug on-off valve can be reliably opened and closed to ensure stable operation. Further, since the spindle is stable as described above, it is possible to easily assemble by providing a washer having a locking plate at the base end of the spindle and fixing the locking plate of the washer to the socket body.

  In addition, when the socket opening / closing valve closes the flow path, a tip seal member is provided so as to be in pressure contact with the outer periphery of the tip of the socket opening / closing valve. The seal member has already been crushed in the radial direction, so that the plug can be inserted into the socket without damaging the tip seal member without providing a chamfer at the tip corner of the plug. The residual amount of fluid remaining on the contact surface between the tip of the plug and the tip of the plug can be extremely reduced.

  Further, when an inner seal member such as an O-ring is provided on the outer periphery of the socket opening / closing valve inward from the tip end portion of the socket opening / closing valve, the tip sealing member provided on the inner surface of the socket body as described above is connected to a plug. Even if there is a risk that the sealing effect of the tip seal member may be insufficient when the contact surface portion of the socket on-off valve passes, the inner seal member prevents fluid leakage through the outer periphery of the socket on-off valve. Can be safer.

  1 and 2, the fluid coupling has a socket (1) and a plug (2), and the socket (1) has a socket on-off valve (4) for opening and closing a socket-side flow path (3). The plug (2) is provided with a plug on-off valve (6) for opening and closing the plug-side flow path (5).

  The socket (1) has a cylindrical socket body (7), and the cylindrical socket opening / closing valve (4) is slidably contacted with the inner surface of the socket body (7) so as to be movable in the axial direction. ing. The socket on-off valve (4) is urged in the plug direction by a spring (8), and an inner seal member (9) such as an O-ring that elastically slides on the inner surface of the socket body (7) is provided on the outer periphery. ing. Further, when the socket on-off valve (4) moves to the moving end on the plug side, the front end seal member (10) such as an O-ring is elastically slidably brought into contact with the outer periphery of the front end of the socket on-off valve (4). It is provided on the inner surface of the main body (7).

  A spindle (11) is fixed in the socket body (7). The spindle (11) has an O-ring (12) at the tip, and when the socket on-off valve (4) moves to the plug-side moving end, the socket on-off valve (4) The inner surface (13) of the socket engages to close the flow path (3) on the socket side, and the tips of the spindle (11) and the socket opening / closing valve (4) are substantially flush with each other. An intermediate portion of the spindle (11) has a large diameter portion (14), and a blade piece (15) is formed so as to be in sliding contact with the inner surface of the socket on-off valve (4). In the figure, four blade pieces (15) are provided, but the number of blade pieces (15) can be any number such as three or five.

  A washer (18) having a substantially rectangular locking plate (17) is inserted into the small diameter portion (16) at the base end of the spindle (11) until it comes into contact with the stepped portion. The washer (18) is attached by inserting a push nut (19) having the same and engaging with the spindle (11). The locking plate (17) of the washer (18) engages with the step (20) of the socket body (7) and is fixed to the socket body (7) by fastening the C pin (21). Is done. In addition, a C pin (22) is provided at the inner end of the socket opening / closing valve (4) so as to prevent the socket opening / closing valve (4) from coming off against the blade piece (15).

  The plug (2) has a cylindrical plug body (23) that is inserted into the socket body (7) and has substantially the same inner and outer diameter as the tip of the socket on-off valve (4). A plug opening / closing valve (6) is provided so that the O-ring (25) is engaged with the inner surface (24) of the tip. The plug opening / closing valve (6) is urged toward the socket by a spring (26), and a blade piece described later. It can move to a position where (27) hits the inner step portion (28) of the plug body (23), and is substantially flush with the tip of the plug body (23) at this position. The outer diameter of the tip of the plug on / off valve (6) is substantially the same as the tip of the spindle (11), and a blade piece (27) is slidably contacted with the inner surface of the plug body (23) on the outer periphery. Is provided. Although four blade pieces (27) are provided, the number of blade pieces (27) can be appropriately set such as three or five. The base end of the plug opening / closing valve (6) is slidably inserted into the insertion hole (30) of the receiving seat (29), and the leg piece (31) of the receiving seat (29) is connected to the plug body (23). ) In the plug body (23) by being elastically engaged with the locking groove (32).

  In order to hold the socket (1) and the plug (2) in a connected state, various holding structures can be employed. In the embodiment shown in the figure, a connecting groove (33) is formed in the plug body (23), and a ball (so as to fit into the connecting groove (33) without dropping inward from the outer surface of the socket body (7)). 34) is provided so that it can protrude and retract, and a detachable sleeve (35) and a tip ring (36) are fitted to the outer periphery of the socket body (7), and the tip ring (36) is biased toward the plug by a spring (37). In addition, the detachable sleeve (35) is urged toward the socket by a spring (38), and is prevented from being detached by C pins (39) and (40), respectively.

  Thus, when the plug (2) is inserted into the socket (1), the tip of the plug body (23) comes into contact with the tip of the socket opening / closing valve (4) and the tip of the spindle (11) is connected to the plug opening / closing valve (6). ) (FIG. 3). When the plug is further pushed in, the socket on-off valve (4) retracts inward against the spring (8), while the plug on-off valve (6) also retracts against the spring (26) (FIG. 4, FIG. 5).

  When the plug (2) is further pushed in, the tip ring (36) hits the shoulder (41) of the plug (2), the tip ring (36) moves to the socket side, and the detachable sleeve (35) The ball (34) is pushed in by the inclined surface (42) and the small diameter portion (43), and the ball (34) enters the connecting groove (33) to connect the plug (2) and the socket (1). At this time, the socket opening / closing valve (4) is separated from the O-ring (12) of the spindle (11), and the plug body (23) is separated from the O-ring (25) of the plug opening / closing valve (6). The flow paths (3) and (5) communicate with each other (FIG. 6).

  In a state where the socket (1) and the plug (2) are connected, the spindle (11) has three parts, a washer (18) part, a blade piece (15) part, and a contact part with the plug on-off valve (6). And the plug on / off valve (6) is supported at three locations: the abutment portion, the blade piece (27) portion and the seat (29) portion. The stable state is maintained in the plug, and the operation of the socket on-off valve (4) and the plug on-off valve (6) is stable.

  To remove the plug (2) from the socket (1), the detachable sleeve (35) is moved to the plug (2) side and the ball (34) is received in the large diameter portion (44) of the detachable sleeve, The engagement with the connecting groove (33) may be released. At this time, the state of the residual fluid will be described. At the start of separation, inside the fine gap between the tip of the socket on-off valve (4) and the tip of the plug body (23) and the tip seal member (10) and the inner seal member (9) It can be considered that a small amount of fluid is leaking into the fine gap on the inner surface of the socket body (7) surrounded by (9) (FIG. 7). Of the residual fluid (45), the fluid present on the inner surface of the socket body (7) flows as the socket on-off valve (4) moves in the direction of the plug (2) by the spring (8) during the separation operation. It is pushed back into the road (FIG. 8).

  The inner surface (13) of the socket on-off valve (4) is in contact with the O-ring (12) of the spindle (11), and the O-ring (25) of the plug on-off valve (6) is the inner surface (24) of the plug body (23). , The flow paths (3) and (5) are closed, and the residual fluid (45) flows between the socket opening / closing valve (4) and the front end surface of the plug body (23) and the spindle (11). And the plug opening / closing valve (6) moves between the front end surfaces (FIGS. 9 and 10), so that only a very small amount of fluid existing in this portion becomes the final residual fluid. In the embodiment shown in the figure, an annular concavo-convex portion is provided and engaged with the tip of the spindle (11) and the tip of the plug on-off valve (6), but if each tip surface is formed flat, The final residual fluid can be further reduced.

  In addition, if a round chamfer (46) is provided at the tip corner of the plug body (23), a large amount of fluid remains in the chamfered portion as shown in FIG. Depending on the nature, etc., there may be no problem.

Sectional drawing which shows one Example of this invention. The disassembled perspective view of a spindle and a plug on-off valve part. Explanatory drawing of the state which inserted the plug in the socket. Explanatory drawing of the state which inserted the plug rather than the state shown in FIG. Explanatory drawing of the state which inserted the plug further than the state shown in FIG. Explanatory drawing of the state which connected the socket and the plug. FIG. 5 is an enlarged explanatory view showing a state of a residual fluid at the start of separation when the plug is separated from the socket. Expansive explanatory drawing in isolation | separation. Furthermore, an enlarged explanatory view during separation. The expansion explanatory view just before pulling out a plug from a socket. The expansion explanatory view at the time of chamfering the tip corner part of a plug.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Socket 2 Plug 3 Socket side flow path 4 Socket on-off valve 5 Plug side flow path 6 Plug on-off valve 7 Socket body 9 Inner seal member 10 Tip seal member 11 Spindle 12, 25 O-ring 15, 27 Blade piece 23 Plug Body 35 Detachable sleeve 36 Tip ring

Claims (4)

  A socket having a socket and a plug, and the socket is a cylindrical socket that is movably provided on the outer periphery of the spindle so as to open and close the spindle provided in the socket body and the socket-side flow path. A fluid coupling including a plug opening / closing valve provided in the plug body so as to be movable in the plug body so as to open and close a flow path on the plug side facing the spindle; A fluid coupling, characterized in that a blade piece is formed in sliding contact with the inner surface of the on-off valve, and a blade piece in sliding contact with the inner surface of the plug body is formed on the outer periphery of the plug on-off valve.   The fluid coupling according to claim 1, wherein a washer having a locking plate is provided at a base end of the spindle, and the locking plate is fixed to the socket body.   2. The fluid coupling according to claim 1, wherein a tip seal member is provided on an inner surface of the socket main body so as to come into pressure contact with an outer periphery of a tip portion of the socket on / off valve when the socket on / off valve closes a flow path.   The fluid coupling according to claim 3, wherein an inner seal member that presses against the inner surface of the socket main body is provided on the outer periphery of the socket opening / closing valve inward from the tip of the socket opening / closing valve.

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