JPS5915831Y2 - pipe fittings - Google Patents

Description

[Detailed Description of the Invention] This invention relates to an improved structure of a pipe joint with a built-in valve body that removably connects male and female members via a locking mechanism such as a locking ball.

Pipe joints of the type described above usually have a structure in which a valve body built into both the male and female members opens at the same time the male and female members are connected, opening the fluid path. .

However, if one or both of the male and female members of such a pipe joint with a valve body is attached to a pipe to which a tensile external force is applied, for example, if it is attached to a pipe that transfers liquefied gas or gasoline from a tank truck to a storage tank. In some cases, it is often necessary to move the tank truck while the male and female members are connected.

However, in such cases, if a large load is applied to the pipe joints, hoses, or piping, the pipe joints may break, causing gas or gasoline to leak out, causing a major accident.
In particular, high-pressure fluids such as liquefied gas, along with highly flammable aviation fuel and gasoline, must be handled with care, and the structure of the pipe joints used is also special.

In other words, this pipe joint with a valve body, which is widely used in piping for transferring hazardous materials, has a double and triple structure in order to improve sealing performance and ease of connection, so fluid pressure is not applied. It is extremely difficult to open the valve body when the male and female members are connected, and this difficulty is compounded as the fluid pressure increases. Also, when separating the male and female members, the negative pressure acts so strongly that separation becomes difficult. be.

This idea was developed in consideration of the fact that it is extremely difficult to connect and separate pipe joints in which both the male and female members have a built-in valve body that blocks the fluid path, as described above. in a direction that facilitates manual connection and separation of the male and female members without causing damage, and separates the male and female members;
The purpose is to allow the male and female members to be separated very safely and quickly when an excessive load is suddenly applied.

This invention will be described in detail below based on embodiments shown in the drawings.

FIG. 1 is a side view showing the male member 10 and male member 50 in a separated state, and FIG. 2 is a longitudinal sectional side view showing both the male and female members 10.
In the following description, the side of the terminals 50 that are connected to each other will be referred to as the "front" and the opposite side will be referred to as the "rear".

The male member 10 includes a central cylindrical body 12, an outer cylindrical body 18 fitted to the outer circumferential portion thereof so as to be slidable in the axial direction, an adapter 20 screwed to the rear end of the outer cylindrical body 18, and a front portion. An operating sleeve 26 is fitted onto the center cylinder 12 so that the part after the center straddles the outer periphery of the outer cylinder 18 so as to be slidable in the axial direction, and the center cylinder 1
It is assembled with the valve body 40 installed inside the front end opening of No. 2 as the main member.

The central cylindrical body 12 has a circumferential groove 14 on the outer periphery of its front end, into which a locking ball 64, which will be described later, is engaged, and a collar 16 on the outer periphery of its rear end.

The front end of the central cylinder 12 enters the front end opening of the female member 50 when the male and female members 10.50 are connected;
The front end surface of the outer cylinder 18 firmly contacts the front end surface of the female member 50, and a compression spring is inserted into the cylindrical gap provided between the inner peripheral surface of the outer cylinder 18 and the outer peripheral surface of the central cylinder 12. 22 interposed therebetween, the elastic force of the spring 22 applied to the collar 16 presses the center cylinder 12 and the outer cylinder 18 relatively in the front-rear direction, and the elastic force of the compression spring 22 pushes the outer cylinder 18 can be slid toward the rear of the axis.

The operating sleeve 26 has a front part 28 having a small diameter, and has a cylindrical gap in which the front part of the outer cylinder body 18 slides, and there is a gap between the central part of the operating sleeve and the outer cylinder body 18. A compression spring 24 is interposed in the cylindrical gap provided between the springs 24 and 24.
The operating sleeve 26 is pressed forward by the elastic force of the compression spring 24, and the sleeve 26 can be slid on the outer cylinder 18 toward the rear of the axis against the elastic force of the compression spring 24.

Note that the front small diameter portion 28 (hereinafter referred to as the small diameter front cylinder portion) of the operation sleeve 26 has the following properties when the male and female members 10.50 are connected.
It enters the cylindrical gap 68 between the front cylinder member 54 and the front end cylinder part 66 of the female member 50, and at this time, the small diameter front cylinder part 28 prevents the locking ball 64 from escaping in the radial direction. .

A fluid passage 36 penetrating the axial center of the central cylindrical body 12 communicates with a male threaded part 30 for connecting a hose fitting of the adapter 20, and is connected to a valve seat 42 formed inside the opening 34 of the front end 32 of the central cylindrical body 12. A valve body 40 is provided which is biased by the elastic force of a compression spring 38, and when the male and female members 10°50 are separated,
This valve body 40 comes into pressure contact with the valve seat 42 and closes the fluid passage 36 .

Reference numeral 44 denotes an air vent hole 44 that is formed approximately at the center in the longitudinal direction of the center cylinder 12 and penetrates in the inner and outer circumferential directions, and is formed between the center cylinder 12 and the outer cylinder 18 which are sealed by a seal ring. A cylindrical gap for mounting the compression spring 22 is communicated with the fluid path 36.

The female member 50 includes a front cylinder member 54 and a rear cylinder member 58 that connects the front cylinder member 54 into the front end opening.

The front cylinder member 54 has an opening 52 into which the center cylinder 12 of the male member 10 is fitted, and this opening 52 is connected to a fluid passage 60 provided at the axial center of the rear cylinder member 58 and a flow passage 88 (described later) to the rear cylinder. It communicates with a female hose fitting connection thread 56 provided at the rear end of the member 58.

A plurality of tapered holes 62 are formed in the front end of the front cylinder member 54 in the radial direction, and locking balls 64 having a diameter larger than the wall thickness of the front cylinder member 54 are loosely fitted into these taper holes 62. , a part of the locking ball 64 protrudes into the opening 52 and locks the central cylinder 12 of the male member 10 when the male and female members 10.50 are connected.
It is adapted to be locked in the circumferential groove 14 of.

The front end cylindrical portion 66 of the rear cylindrical member 58 extends forward so as to cover the taper (L62) in order to prevent the locking ball 64 from escaping.

In FIG. 2, reference numeral 74 denotes an air inlet/outlet hole (hereinafter referred to as a "through hole") provided near the back of the opening 52 of the front cylinder member 54 in the inner and outer peripheral directions of the member 54.
0 connection, the air existing in the space between the inner part of the opening 52 and the central cylinder body 12 of the male member 10 and the front surface 34 of the valve body 40 is transferred to the outer periphery of the front cylinder member 54 through the through hole 74. When the male and female members 10.50 are separated, the air existing on the outer circumferential side of the front cylinder member 54 is directed toward the space where the pressure becomes negative. 58 and the front end cylindrical portion 66, and can be introduced from the through hole 74.

A non-holding body 82 is installed inside the rear cylinder member 58 so as to be slidable in the axial direction, and a valve rod 80 having a valve head 78 is fixed to this non-holding body 82.

A compression spring 84 is provided between the non-holding body 82 and the valve head 78.
A sliding valve 86 is inserted, which is pressed by the valve head 78 and is in contact with the above-mentioned fitting (1).
76 and closes the fluid path 60.

The non-holding body 82 has a communication hole 88 inside and a groove 90 on the outer peripheral surface.

In addition, an operating cam 94 is rotatably fitted into a pair of holes 92 bored in the rear cylinder member 58 near this part, and a protrusion 96 provided on the eccentric part of the operating cam 94 is inserted into the above-mentioned groove 90.
engage with.

The operation cam 94 is attached to the outer peripheral surface of the rear cylinder member 58.
An operating lever 98 pivotably pivoted around the center of the
It is integrally fixed to the center of rotation of the operating lever 98.
When rotated, the non-holding body 82 slides in the front-rear direction via the operation cam 94.

Next, the operation of the above embodiment will be explained.

When the central cylindrical body 12 of the male member 10 is inserted into the opening 52 of the female member 50, the locking ball 64 is forcibly moved out in the radial direction to prevent the small diameter front cylindrical portion 28 of the operating sleeve 26 from entering into the gap 68. do.

When the male member 10 is further inserted, the operating sleeve 26 temporarily retreats against the elastic force of the compression spring 24 without manual operation, and the circumferential groove 14 of the central cylindrical body 12 faces the locking ball 64. When the locking ball 64 is reached, the operating sleeve 26 moves back due to the elastic force of the compression spring 24, and the front cylinder portion 28 locks the locking ball 64 in the circumferential groove 14.

In this way, the connection between the male and female members 10.50 is completed.
2, the air within the opening 52 becomes gradually compressed.

However, in such a case, if the air pressure within the opening 52 increases to a certain extent, the front cylinder member 5 of the female member 50
The air in the opening 52 escapes to the outer periphery of the front cylinder member 54 through the penetration (L74) provided at The air within the opening 52 will not rise high enough to prevent the insertion of the central barrel 12, and therefore the male and female members 10°50
connection becomes easy.

Note that even if the male and female members 10.50 are connected as described above, the valve body 40 of the male member 10 and the sliding valve 86 of the female member 50 will not both open.

Therefore, the air within the opening 52 of the female member 50 will be exhausted out of the fitting through the through hole 74 before the sliding valve 86 within the female member 50 opens.

Next, when the operating lever 98 is rotated, the operating cam 94 is rotated and the non-retaining body 82 and the valve stem 80 move forward due to the engagement between the eccentric protrusion 96 and the groove 90, and the sliding valve 86 corresponds to the front end 32 of the central cylinder 12 of the male member 10.

Next, the valve head 78 of the female member 50 touches the valve body 4 on the male member 10 side.
0 is retracted so that the fluid passages 36.60 of the male and female members 10.50 are in communication with each other.

Therefore, when the male and female members 10.50 are connected, the fluid path 36
, 60, the male and female members are connected regardless of this fluid pressure, and the valve body 40
will also be held.

As shown in FIG. 4, the interconnected male and female members 10.50 once connected and with the valve body 40 open.
To separate the fluid passages 36 and 60, first, the operating lever 98 is rotated in the opposite direction to return the valve body 40 and the slide valve 80 to their original positions, thereby cutting off communication between the fluid passages 36 and 60.

Next, the operation sleeve 26 resists the elastic force of the compression spring 24.
When the locking ball 6 provided on the female member 50 is slid backward, the locking ball 6 provided on the female member 50
4 can escape in the radial direction, but if you try to pull out the front end 32 of the central cylinder 12 of the male member 10 from the opening 52 of the female member 50 when separating the male member 10 and the female member 50, the female member Since the air on the outer peripheral surface side of the front cylinder member 54 of No. 50 flows into the inner part of the opening 52 through the through hole 74 of the front cylinder member 54,
There is no negative pressure in the inner part of the opening 52, so that the male member 10 and the female member 50 can be easily separated.

Next, when a load greater than the elastic force of the compression spring 22 is applied in a direction that separates the male and female members 10.50, for example, as shown in FIG. is pulled backward while compressing the compression spring 22. At this time, the operating sleeve 26 also moves in the same direction against the elastic force of the compression spring 24, and the front cylinder portion 28 of the operating sleeve 26 engages the locking ball 64. release.

Therefore, the locking ball 64 is ready to escape from the circumferential groove 14 of the male member 12, and the male member 10 and the female member 50 can be separated without manually operating the operating sleeve 126 as described above, and the pipe fitting can be closed. to prevent it from being damaged.

As is clear from the above embodiment, this device consists of a male member 10 and a female member 50, each of which has a built-in valve body that closes the fluid path in the free assist state, and after the male and female members are connected, the valve body is closed. The pipe joint is configured to open the fluid passage by sliding, and the male member 10 includes a central cylindrical body 12, and a compression spring 22 is interposed on the inner peripheral surface of the male member 10 to resist the elastic force of the spring. The outer cylindrical body 18 is fitted onto the outer periphery of the central cylindrical body so as to be slidable toward the rear of the axis. An operating sleeve 26 having a small-diameter front cylinder portion 28 fitted on the outside and a valve body 40 pressed toward a valve seat 42 at the front end of the central cylinder body are attached, and the female member 50 has a , a front cylinder member 54 and a rear cylinder member 58 that supports the front cylinder member in the front end opening are provided, and a predetermined position at the front end of the front cylinder member 54 is tapered in the radial direction (L62
A locking ball 64 having a wall thickness greater than that of the front cylinder member 54 is loosely fitted into the tapered hole, and a front end cylinder is provided at the front end of the rear cylinder member 58 to prevent the locking ball from escaping. Section 66
is formed by providing an annular gap 68 between the male member 10 and the front cylindrical member 54, and when the male and female members are connected to each other, the small diameter front cylindrical portion 28 of the male member 10 enters the annular gap 68 of the female member 50. , in a pipe joint in which the locking ball 64 is locked in the circumferential groove 14 of the central cylindrical body 12 of the male member 10, the front cylindrical member 54
An air inlet/outlet through hole 74 is provided near the back of the opening 52 for communicating the inner and outer peripheries of the front cylinder member, and the male and female members are connected and separated through the through hole 74. Since air flow is generated on the inner and outer circumferential surfaces of the front cylinder member 54, in the process of connecting the male and female members 10.50, the air present inside the front cylinder member 54 of the female member 50 is removed. is discharged from the through hole 74 without being compressed, making it extremely easy to connect both members.

Further, when separating the male and female members 10.50, it is possible to prevent outside air from entering the fitting portion of the male and female members 10.50 and create a negative pressure inside, thereby making it easier to separate the male and female members 10.50 in an emergency.
50 can be separated very quickly and easily.

As described above, according to this invention, the features of the airtight special pipe joint, which has a double and triple cylindrical structure in order to improve sealing performance and ease of connection, can be made more effective. I can do it.

[Brief explanation of the drawing]

The drawings show one embodiment of this invention, in which Fig. 1 is a side view showing a separated state, Fig. 2 is a longitudinal cross-sectional plan view taken along line III in Fig. 1, and Fig. 3 shows a connected state. FIG. 4 is a quarter sectional view of the main part showing the valve body in an open state. DESCRIPTION OF SYMBOLS 10... Male member, 12... Center cylindrical body, 18... Outer cylindrical body, 22... Compression spring, 26... Operation sleeve,
36...Fluid path, 4o...Valve body, 42...Valve seat,
50...Female member, 54...Front tube member, 58...Rear tube member, 60...Fluid path, 62...Tapered hole, 6
4... Locking ball, 74... Air inlet/outlet through hole, 8
6...Sliding valve.

Claims (1)

[Scope of utility model registration request] It consists of a male member 10 and a male member 50, each of which has a built-in valve body that closes the fluid path in a free state, and after the male and female members are connected, the valve body is slid to open the fluid path. It is a pipe joint, and the male member 10 has a central cylinder body 12.
, an outer cylindrical body 18 which is fitted onto the outer periphery of the central cylindrical body so as to be able to slide toward the rear of the axis against the elastic force of the spring with a compression spring 22 interposed on the inner circumferential surface; and a compression spring 24. The operation sleeve 26 has a small-diameter front cylinder part 28 fitted on the outside of the outer cylinder body so as to be slidable toward the rear of the axis against the elastic force of the central cylinder body, and a valve seat 42 at the front end of the central cylinder body. The female member 50 is provided with a valve body 40 that is pressed and biased, and the female member 50 is provided with a front cylinder member 54 and a rear cylinder member 58 that supports the front cylinder member in the front end opening. A tapered hole 62 is formed in the radial direction at a predetermined position at the front end of the member 54, and a locking ball 64, which is larger than the wall thickness of the front cylinder member 54, is loosely fitted into the taper hole. A front end 66 for preventing the locking ball from escaping is formed at the front end of the member 58 with an annular gap 68 between it and the front cylinder member 54, so that when the male and female members are connected to each other, the male member 10
The small diameter front cylinder portion 28 of the female member 50 is connected to the annular gap 68 of the female member 50.
In a pipe joint in which the locking ball 64 is engaged with the circumferential groove 14 of the central cylindrical body 12 of the male member 10 by entering the inside of the pipe, the front cylindrical member 54 has a front portion near the back of the opening 52. An air inlet/outlet through hole 74 is provided to communicate the inner and outer peripheries of the cylindrical member, and an air flow is generated between the inner and outer peripheries of the front cylindrical member 54 through the through hole 74 when the male and female members are connected and separated. A pipe joint characterized in that the pipe joint is made to