JPS6337595Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to a swivel connection device, and more specifically, how to apply rotational torque applied to the tube body to the swivel inner tube, and how to connect the swivel inner tube and the inner tube portion of the tube body. This invention relates to a swivel connection device that focuses on the torque relationship.

For example, in order to rotate the inner tube of a liquid drug injection tube together with the outer tube, a projecting portion is provided on the inner tube, a protrusion is formed on the inner surface of the outer tube, and this is achieved by the locking action of these projections. If the accompanying rotation is not guaranteed, there is a risk that the sealing O-ring may seize or a torsional torque may act on the inner tube, causing damage.

By the way, the above example is sufficient if it is a double pipe, but
Injection pipes with three or more flow paths, especially injection pipes with parallel flow paths, require special measures to avoid the above situation.

Therefore, the present invention was proposed, and its purpose is to provide a swivel connection device in which the inner tube rotates reliably as the outer tube rotates, thereby preventing seizure damage to the sealing O-ring. It is in.

The present invention will be explained below using a specific example of a chemical liquid injection tube shown in the drawings.

Figures 1 to 3 show an example of a three-channel swivel device, in which 1 is a swivel outer cylinder, and its end 1a
(left side in FIG. 2) is open, and a cutout slit 1b is formed in the peripheral wall along the longitudinal direction.
An inner tube support tube 2 is threadedly connected to the swivel outer tube 1 and supports a swivel inner tube 4 via a bearing 3. First and second swivel inner cylinders 5 and 6 are housed inside the swivel outer cylinder 1, and joints 7 and 8 that constitute supply ports 7a and 8a are integrated into each swivel inner cylinder 5 and 6 by welding or the like. has been made into Further, an end piece 9 having a supply port 9a is connected to the swivel outer cylinder 1. For this connection, there are, for example, four overhangs 9b formed on the end piece 9.
and the overhanging portion 1c of the swivel outer cylinder 1 are connected by a fastening bolt 10 passing through the swivel outer cylinder 1.

When assembling the swivel, first insert the swivel inner cylinder 5 from the open end of the swivel outer cylinder 1 on the left side in FIG. The swivel inner cylinder 6 is then covered with the end piece 9, and the end piece 9 is connected to the swivel outer cylinder 1 with a fastening bolt 10.

On the other hand, inside the swivel inner tube 4, a second flow path 11 and a third flow path 12 extend in parallel. The end of the second flow path 11 is closed by a blind plug 13, and an inlet 14 is formed in the peripheral wall and communicates with the supply port 8a. The end of the third flow path 12 is open and communicates with the supply port 9a. Furthermore, a through hole is formed in the axial direction on the back side of the swivel inner tube 4 in the plane of the drawing, and this hole serves as a first flow path 15. A first outer joint 16 is threadedly connected to the swivel inner tube 4 at a threaded portion H,
A second outer joint 17 is threadedly connected to the outer joint 16 at a threaded portion I. The first inner joint 18 is inserted from the right side of the outer joint 16 and fixed by the stepped shoulder on the left side of the second outer joint 17. Connected by screws.

The inner joint 18 has a second flow path 20 and a third flow path 2.
1 are formed in parallel, and are connected to the second flow path 11 and the third flow path 12 through joint pins 22 and 23, respectively.
is connected to. The second flow path 20 extends from an outlet 20a penetrating the peripheral wall of the inner joint 18 through a gap between the inner joints 18 and 19 to the injection pipe body (not shown). On the other hand, the first flow path 15 described above is connected to the inner joint 18
The face appears for the first time at the right stepped part of the outer joint 1.
It communicates with a first flow path 24 in the gap between 7 and the inner joint 19 .

25 is made of a flexible material such as rubber, and the tongue portion 25
A is an annular seal valve for sealing with the swivel inner tube 4, and is positioned via a collar 26. 27 is a drain extraction hole.

With the swivel device configured in this way, it is only necessary to insert the swivel inner cylinders 5 and 6 into the swivel outer cylinder 1, cover them with the end piece 9, and fasten the swivel outer cylinder 1 with bolts as described above. , assembly is extremely simple, and disassembly is also extremely simple by reverse operation.

Note that the connection between the end piece 9 and the swivel outer cylinder 1 is not limited to the bolt 10, and may be screwed together.

Such a swivel device includes a tube main body 50 shown in FIG. 3 having a tip device (not shown) at the tip.
connected to. The tube main body 50 has two inner tubes 52 and 53 installed in parallel inside an outer tube 51.
A joint 54 is installed inside the base side of the outer tube 51 and fixed at a threaded portion K, and second and third flow passages 55 and 56 formed parallel to this joint 54 include
Inner tubes 52 and 53 are inserted and fitted. Also, joint 5
4, a notch is formed on the back side of the drawing, and this becomes a first flow path 57, which exits into the gap between the outer tube 51 and the inner tubes 52 and 53.

When connecting the swivel device and the tube main body 50, after aligning each other, the outer joint 17 and the outer tube 51 are screwed together while rotating the outer joint 17. Accordingly, the left portion of the joint 54 fits into the receiving opening of the first receiving joint 18 . As a result, the third flow path 21 and the third flow path 56 communicate with each other, and the second flow path 20 communicates with the second flow path 55 via the gap between the inner joints 18 and 19 and the inlet 55a. Further, the first flow path 24 communicates with a first flow path 57 . Each liquid is thus directed to the tip device.

Then, when a rotational torque in the circumferential direction is applied to the outer tube 51 of the tube main body 50 during drilling or injection, this torque is applied to the second outer joint 17,
Furthermore, it is provided to the first outer joint 16 via the threaded portion H and to the swivel inner tube 4 via the threaded portion I,
The swivel inner tube 4 rotates together. At this time, there are joint pins 22, 23 between the channels 11, 12 of the swivel inner tube 4 and the channels 20, 21 of the first inner joint 18.
Since the inner joint 18 is straddled, the inner joint 18 rotates according to the swivel inner tube 4. Further, the second inner joint 19 which is threadedly connected to the first inner joint 18 via the threaded portion J also rotates in a subordinate manner.

On the other hand, as the outer tube 1 rotates, the joint 54 rotates along with the rotation of the outer tube 1 via the threaded portion K. As a result, the rotations of the inner joints 18, 19 and the joint 54 match, and seizure damage to the O-rings _O1 , _O2 due to mismatched rotations between them is prevented.

Note that the joint 54 and the outer tube 1 are fixed using the threaded portion K.
Instead of screwing together, a locking bolt or the like extending from the outer tube 1 to the joint 54 may be used.

5 and 6 are examples of a four-channel injection tube, and FIG. 6 shows a state in which the swivel inner tube 4' is rotated 90 degrees from the state shown in FIG. A swivel inner cylinder 6' is added to allow the liquid to flow. The swivel inner tube 4' has four channels 4'a, 4'b, 4'c, 4'd.
are formed, and the first inner joint 18' has three channels 1
8'b, 18'c, 18'd and another flow path 18'a which exits laterally are formed. Further, a third inner joint 100 is threadedly connected to the first inner joint 18' via a threaded portion L. Furthermore, flow paths 4'b, 4'c,
4'd and the channels 18'b, 18'c, and 18'd are connected and communicated through joint pins 101, 102, and 103. Since it can be easily inferred that this example of four channels also has the same effect as the above example, the explanation will be omitted.

On the other hand, in the above example, the swivel inner pipe 4 and the first joint 18 are connected by the joint pins 22, 23, but as shown in FIGS. O-rings 201 and 202 are installed in the flow passage component of the abutting surface between 4 and the first joint 8.
are provided and connected by a knock pin 203,
They may be rotated at the same time.

As described above, in the present invention, the outer joint and the swivel inner pipe are integrated, and the inner joint is integrally connected to the swivel inner pipe in a non-rotatable manner in the circumferential direction. Since the joint is integrally fixed to the inner joint and the joint, when the outer tube (including the outer joint) rotates, the inner joint and the joint rotate together, so damage to the O-rings of their seals can be reliably prevented. Also, troubles in the inner tube caused by uneven rotation can be prevented.

[Brief explanation of the drawing]

Fig. 1 is a perspective view of the three-channel swivel, Fig. 2 is a longitudinal sectional view thereof, Fig. 3 is a longitudinal sectional view of the tube main body, Fig. 4 is a sectional view taken along the - line, Figs. FIG. 6 is a longitudinal sectional view of an example with four channels, FIG. 7 is a sectional view of a main part of an example with three channels in different configurations, and FIG. 8 is a view taken along the - line. 4, 4'... Swivel inner pipe, 16, 17... Outer joint, 18, 18', 19... Inner joint, 22, 2
3...Joint pin, 50...Pipe body, 51...Outer tube, 54...Joint, 100...Inner joint, 10
1,102,103...Joint pin, 203...Knock pin.

Claims (1)

[Scope of utility model registration request] A swivel inner tube that is rotatably supported within the swivel and has a plurality of parallel flow paths formed therein, and an outer joint that is threadedly connected to the outer tube of the tube body are integrated, and the swivel inner tube is attached to the proximal end side. An inner joint in which a parallel flow path corresponding to the parallel flow path is formed is installed in the outer joint,
A joint is integrally fixed to the inner joint of the tube body, and when the outer pipe of the tube body is screwed to the outer joint, the joint and the inner joint can be freely inserted, and the inner joint is inserted into the swivel. A swivel connection device characterized in that a pipe and an inner joint are integrally connected so as to be rotatable in the circumferential direction.