JP2577515B2 - Liquid dripping prevention fittings - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mechanism for preventing internal fluid from dripping to the outside when a one-touch type fitting is attached or detached.

[0002]

2. Description of the Related Art Conventional one-touch fittings include:
For example, there is a structure shown in Japanese Utility Model Laid-Open No. 62-13289. This pipe joint fits a female joint and a male joint and maintains them in a fitted state by a lock mechanism such as a ball lock system. When connecting, the two joints are pushed and a valve provided inside the joint is pressed. By connecting the bodies while opening the flow path by pressing each other, the connection state is maintained by a lock mechanism.

[0003]

However, when separating a pipe joint having such a structure, the lock mechanism is released and the two joints are separated from each other, so that the internal valve element closes the flow passage. A gap is formed between the two joints until the flow path is completely closed by the valve body, and the gap is filled with the internal fluid.
There is a drawback that the fluid drips to the outside. In particular, there is a safety problem when the internal fluid is a powerful drug or the like.

[0004] The present invention has been made in view of the above-mentioned circumstances, and an object of the present invention is to provide a pipe joint in which the internal fluid does not hang outside when the connection is disconnected.

[0005]

In order to achieve the above object, the present invention provides a pipe joint having a male joint and a female joint which are connected in a fitted state, and a lock mechanism for maintaining the both connected. Each joint is provided with a valve body that is slidably disposed therein to close the flow path in a free state and open the flow path by being pressed together when the two joints are connected, The female joint is provided with a female housing for fitting the male joint, and a casing for slidably fitting to the rear portion of the female housing and housing the valve body,
A first drain hole and a first suction hole communicating with the flow path at a position in front of the valve body when the casing is at the rear end of the sliding range are provided on a side wall of the female housing.
When the casing is retracted until the two valve bodies close the flow path, the second drain hole and the second drain hole which correspond to the first drain hole and the first intake hole and communicate with the outer space, respectively. And an engagement mechanism for holding the casing with the flow path connected thereto is provided between the female housing and the casing.

[0006]

In the pipe joint of the present invention, the male and female joints that can be fitted to each other are brought into a fitted state by a lock mechanism, and the casing that is slidably fitted to the female housing is slid toward the male housing. By pressing the valve elements provided inside the two together to open and connect the flow path, the casing is engaged with the female housing by the engagement mechanism to maintain the connection of the flow path.

When the pipe joint is separated, the valve body is released by releasing the engagement between the female housing and the casing and retreating the casing away from the male housing. Each channel is closed. At this time, when the casing retreats, a gap is formed between the male joint and the male joint, and the fluid is filled therein. However, the second drain hole and the second suction hole provided in the casing are connected to the female housing. And communicate with the outer space from the inner surface of the female housing between the casing and the male housing in accordance with the first drainage hole and the first intake hole provided in the housing. This allows the fluid between the male housing and the casing to drain through the drain hole, after which the locking mechanism can be released to separate the fitting.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A pipe joint according to an embodiment of the present invention will be described below with reference to the drawings. The drawing shows a pipe joint having a lock mechanism of a ball lock type. FIG. 1 shows a state after connecting the housing and before connecting the flow path, and FIG. 2 shows a state after connecting the flow path.

The pipe joint of this embodiment comprises a male joint 1 and a female joint 2 which can be fitted to each other. The male joint 1 is connected to the male housing 3, and the female joint 2 is connected to the male housing 3. Four. The female housing 4 is formed in a tubular shape, and a lock mechanism 5 for engaging the fitted male housing 3 is provided at a front end thereof. It is provided so as to be slidable in the circumferential direction. In the example shown in FIGS. 1 and 2, the casing 6 is formed in a double tubular shape, and wraps the female housing 4 from the rear end so as to wrap the inner surface 4 a of the female housing 4.
And an outer surface 4b, and a fitting surface with the inner surface 4a is sealed by an O-ring 7.

The casing 6 and the male housing 3 are provided with fluid holes 8 and 9 extending in the fitting direction of the housings 3 and 4 respectively. Openings 10 and 11 are formed at the front end of each of the fluid holes 8 and 9, and female screw portions 14 and 15 to which external conduits 12 and 13 are connected are formed at the rear end. Also, the fluid holes 8, 9
Are provided with slidable valve bodies 16 and 17. At the front ends of these valve bodies 16 and 17, projecting portions 16a,
17a is provided, and the rear end is formed in a tubular shape with the inside being hollowed out, and flow holes 18 and 19 are provided through the pipe wall. Spring fixing rings 20 and 21 are fixed behind these valve bodies 16 and 17, and compression coil springs 22 and 21 are provided between the valve bodies 16 and 17 and the spring fixing rings 20 and 21.
The valve bodies 16 and 17 are constantly pressed forward by the compression coil springs 22 and 23. Then, the free state as shown in FIG.
When no external force is applied to the valve bodies 16 and 17, the valve bodies 16 and 17 are moved to the valve seat 2 behind the openings 10 and 11.
Openings 10 and 11 are closed in contact with 4, 25,
The projecting portions 16a, 17a of the valve bodies 16, 17 have openings 10, 1
1 protrudes forward. 26 and 27 are valve bodies 16 and 1
An O-ring provided at a contact portion between the valve seat 7 and the valve seats 24 and 25.

The female housing 4 has an inner surface 4a.
A first drain hole 28 and a first suction hole 29 penetrating through the outer surface 4b of the housing 6 are provided. In the casing 6, the housings shown in FIG. A second drain hole 30 and a second suction hole 31 are provided, one end of which coincides with the first drain hole 28 and the first suction hole 29 and the other end is open to the outer space. . In the above state, the inner surface openings 28a and 29a of the first drain hole 28 and the first suction hole 29 are located forward of the front end 6a of the casing 6, and the space inside the joints 1 and 2 is outside. It is designed to communicate with the space. O-rings 32 and 33 are disposed between the first drain hole 28 and the second drain hole 30 and between the first suction hole 29 and the second suction hole 31, respectively. The pipes 34 and 35 extending from the space to the outer space are sealed against the gap between the female housing 4 and the casing 6. The outer opening 30a of the second drain hole 30 is connected to a suction pump via a connection joint 36, so that suction is always performed.

Further, an engagement mechanism 37 for engaging the female housing 4 and the casing 6 is provided on a fitting surface between the female housing 4 and the casing 6. The engagement mechanism 37 is provided on the outer surface 4 of the female housing 4.
a, and a claw portion 39 provided in the casing 6. This guide groove 38
Is a sliding part 3 provided linearly in the fitting direction of the joints 1 and 2
8a and a holding portion 38b provided along the circumferential direction from the front end of the sliding portion 32a, is formed into an L-shape as shown in FIG. The casing 6 is made inseparable from the female housing 4 and is guided so as to interrupt the flow path. An outer surface 4a of the female housing 4 is provided with a flange 40 having an outer diameter substantially equal to the outer diameter of the casing 6. Guards from joining.

In the example shown in FIGS. 1 and 2, the lock mechanism 5 is provided with a plurality of guide holes 41 radially on the circumference of the female housing 4 so as not to fall inside the guide holes 41 so as to be guided. A plurality of locking balls 42 movably arranged along the holes 41 are pressed inward by convex portions 43 a of an operating sleeve 43 provided on the outer periphery of the female housing 4, and holding recesses 44 provided on the outer periphery of the male housing 3. Is a lock mechanism 5 of a so-called ball lock system that holds the housings 3 and 4 fitted by engaging with each other. The operating sleeve 43 is constantly pressed from behind by a lock spring 45. When the two housings 3 and 4 are fitted together, the operating sleeve 43 is moved rearward against the lock spring 45, and after the locking ball 42 is once released, When the operation sleeve 43 is returned to the original position, the locking ball 42 is engaged with the holding concave portion 44, and the housings 3 and 4 are locked. An O-ring 46 seals the fitting surfaces of the housings 3 and 4.

To connect the joints 1 and 2 configured as described above and connect the flow paths, first, the claw 39 provided on the casing 6 is connected to the sliding portion 38 of the guide groove 38 of the female housing 4.
a, the casing 6 is slidable, the operating sleeve 43 at the tip of the female housing 4 is moved backward to fit the male housing 3 and the female housing 4, and the locking mechanism 5 is locked to fit. Hold. At this time, joint 1,
2 is in the state shown in FIG. 1 and the fitting surfaces of both housings 3 and 4 are sealed by O-rings 7. Next, the casing 6
Is pushed forward, the protruding portions 16a, 17a of the valve bodies 16, 17 inside the casing 6 and the male housing 3 are pressed together, and the valve bodies 16, 17 are compressed while the compression coil springs 22, 23 are compressed. The flow path is connected apart from 25. Then, the claw portion 39 of the casing 6 is
8a, when the casing 6 is rotated along the guide groove 38 when the front end is reached, the claw portion 39 is held by the holding portion 38b of the guide groove 38.
And the flow path is maintained in a connected state. In this state, the first drain hole 28 and the first suction hole 29 provided in the female housing 4 close the inner opening portions 28a, 29a inside the female housing 4 by the casing 6, and The drain hole 30 and the second suction hole 31 of FIG. 1 pass over the O-rings 32 and 33 disposed between the first drain hole 28 and the first suction hole 29, and the inside and outside of the pipe joint are connected. It is completely shut off from space.

On the other hand, the joints 1, 2 connected as described above
Is separated by a procedure reverse to the procedure at the time of connection described above. That is, the casing 6 and the female housing 4
Is released, and the casing 6 is slid backward. When the casing 6 reaches the rear end of the sliding range, the valve element 1 in the casing 6 and the female housing 4
At the same time as 6 and 17 close the respective openings 10 and 11,
Small space 4 filled with internal fluid between both valve bodies 16 and 17
7 is formed. In this state, the first drain hole 2
8 and the second drainage hole 30, and the first intake hole 29 and the second intake hole 31 are respectively aligned to form conduits 34 and 35 that communicate the small space 47 and the outer space. Second drain hole 30
Since the suction pump is connected to the outer surface opening 30a, the fluid filled in the small space 47 is discharged through the pipe 34, and is replaced with the air in the outer space sucked through the pipe 35. Thereafter, by releasing the lock mechanism 5, the joints 1 and 2 are separated.

A projecting piece 48 penetrates the flange 40 of the outer surface of the female housing 4 at the distal end of the casing 6, and its distal end surface 48a is
3 is provided so as to face the rear end face 43b of the casing 6 and penetrate the flange portion 40 with the projecting piece 48 of the casing 6 which rotates around the female housing 4 along the guide groove 38. As described above, a fan-shaped through hole 40a is provided. In the state where the casing 6 is at the front end of the sliding range, the front end surface 48a of the protruding piece 48 abuts on the rear end surface 43b of the operation sleeve 43, thereby making the operation sleeve 43 inoperable. That is, if the joints 1 and 2 are detached while the casing 6 is at the front end of the sliding range, the flow path is opened in a state where the housings 3 and 4 are not hermetically sealed, and the internal fluid leaks. Therefore, the lock mechanism 5 cannot be released. Thereby, connection and disconnection of the joints 1 and 2 can be realized without making a mistake in the procedure.

In this embodiment, the casing 6 has a double tubular shape, and the inner surface 4a and the outer surface 4 of the female housing 4 are formed.
b, but does not have to be a double tube, and is slidably fitted to at least one of the inner surface 4a or the outer surface 4b of the female housing 4 so that the first surface is formed on the fitting surface. Drain hole 28, second drain hole 30, first intake hole 29
If the second suction hole 31 and the second suction hole 31 are intermittent, for example, as shown in FIG. 5, the first drain hole 28 and the second drain hole 28 are formed in the fitting surface between the inner surface of the female housing 4 and the casing 6. Drain hole 3
0 and the first suction hole 29 and the second suction hole 3
Alternatively, a connection port with the first connection may be provided.

[0018]

As described in detail above, according to the present invention,
When connecting the pipe joint, the female housing and the male housing are fitted together to seal the inside and then slide the casing to connect the flow passages, so that the fluid inside does not leak to the outside. Further, when the connected pipe joint is separated, the casing slides to close the flow path, and at the same time, the fluid filled in the small space formed between the casing and the male housing is discharged, and then the locking mechanism is used. Is released to separate the two joints, so that the fluid does not drip from the separated pipe joint. Therefore, when used as a pipe joint for connecting a fluid such as a powerful drug, there is an effect that the powerful drug or the like does not hang outside and a person who handles it can work safely.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view after a partial connection of a dripping prevention pipe joint according to an embodiment of the present invention.

FIG. 2 is a vertical cross-sectional view of the joint for preventing dripping according to one embodiment of the present invention after connection of a flow path;

FIG. 3 is a view of a guide groove provided in the female housing according to one embodiment of the present invention, as viewed from the direction of arrow A in FIG. 1;

FIG. 4 is a perspective view of the vicinity of a projecting piece provided on a casing according to an embodiment of the present invention.

FIG. 5 is a longitudinal sectional view showing a modified example of a drainage hole and a suction hole.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Male joint 2 Female joint 3 Male housing 4 Female housing 5 Lock mechanism 6 Casing 16, 17 Valve body 28 First drain hole 29 First intake hole 30 Second drain hole 31 Second intake hole 38 Guide Groove 39 Claw

Claims (1)

(57) [Claims] 1. A pipe joint having a male joint and a female joint connected in a fitted state, and a lock mechanism for maintaining the both connected in a connected state, wherein each joint is slidably disposed therein. A valve body that closes the flow path in a free state and opens the flow path by being mutually pressed when the two joints are connected is provided, The female joint includes a female housing that fits the male joint, A casing housing the valve body slidably fitted to a rear portion of the female housing; and a side wall of the female housing, a front position of the valve body when the casing is at a rear end of a sliding range. A first drain hole and a first suction hole communicating with the flow path are provided in the casing, and the first drain is formed when the casing is retracted until the valve bodies close the flow path. Hole and first
A second drain hole and a second suction hole which respectively correspond to the suction holes and communicate with the outer space. The casing is provided between the female housing and the casing in a state where the flow path is connected. A dripping prevention pipe joint, wherein an engagement mechanism for holding is provided.