JPH10131658A - Piston device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To constantly adhere a sealing part on an inner peripheral surface of a cylindrical body by adding a plural number of drill rods and inserting a piston packing on which diametrical change absorbing groove is formed inside an outer tube assembly the inside diameter of which changes. SOLUTION: An outer tube assembly 11 to change its inside diameter by sequentially adding drill rods as they are inserted into a ground layer and by installing a water swivel free to connect and disconnect on its top end is constituted to sequentially screw a bit, a bit adapter and an outer tube under an outer tube adapter 12. A piston packing 26 fixed between washers 25, 27 forms a fitting hole 64 to fit on a spear head body 23 on a central part, forms a diametrical change obsorbing groove 65 circular and forms a sealing part 66 to adhere on an inner peripheral surface of the outer tube adapter 12. Consequently, the sealing part 66 can constantly hold a watertight sealing function while absorbing a contracting change of an inside diameter of a screwing connection part.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to a piston device.

[0002]

2. Description of the Related Art As shown in JP-B-44-642, an inner tube assembly is inserted into an outer tube assembly by a fluid pressure through a cylinder (hereinafter referred to as a drill rod) called a drill stem or a drill rod. In addition, a wireline core barrel is shown in which the inner tube assembly is taken out by an overshot device with a wire cable.

The apparatus described in this publication receives fluid pressure by a piston structure in which a part of a member constituting an inner tube assembly is formed to have a larger diameter than other parts. However, such a piston structure is applied. This requires that the drill rod and outer tube assembly have the same inner diameter.

As shown in FIG. 5, a plurality of drill rods 1 and an outer tube assembly 11 are formed to have substantially the same outer diameter, but are enlarged like a drill rod 1a shown in FIG. Is formed with a large diameter of the parts 2 and 3 to be screwed and secured to a required thickness, and the outer diameter of the parts 2 and 3 to be screwed and the intermediate part 4 between the parts are different from each other. Has occurred.

[0005]

Such a shape in which the outer diameter changes causes problems such that the large-diameter portions 2 and 3 are easily worn, and the hole 5 is difficult to come off due to collapse.

On the other hand, when the outer diameter is the same over the entire length as in a drill rod 1b shown in FIG. 7, it is necessary to change the inner diameter in order to secure the wall thickness of the parts 2 and 3 to be screwed. However, there is a problem that the conventional piston structure cannot be applied to the drill rod 1b having such a shape that the inner diameter changes.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and has as its object to provide a piston device which can cope with a change in the inner diameter of a cylindrical body.

[0008]

According to a first aspect of the present invention, there is provided a piston device which operates in at least one direction by receiving a fluid pressure in a cylinder, wherein the piston body is movably fitted to the cylinder. A diameter change absorption groove formed in an annular shape on the side of the piston body that receives fluid pressure to absorb a diameter change,
The piston device includes a seal portion formed on the outer peripheral side of the piston main body through the diameter change absorption groove and in close contact with the inner peripheral surface of the cylindrical body.

Then, the diameter of the seal portion is changed with respect to the piston body by the diameter change absorbing groove in accordance with the change in the inner diameter of the cylinder,
Always keep the seal part in close contact with the inner peripheral surface of the cylinder.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to FIG.
This will be described with reference to FIGS.

As shown in FIG. 3 or FIG. 4, an outer tube assembly 11 includes an outer tube adapter 12 as a cylindrical body, an outer tube 13 screwed to a lower side of the outer tube adapter 12, and an outer tube Tube 13
And a bit 15 screwed to the lower side of the bit adapter 14.

A landing ring 16 is fixed to the upper inner peripheral surface of the outer tube 13 between the inner peripheral concave portion of the outer tube 13 and the lower end of the outer tube adapter 12. , An inner tube stabilizer 17 is fixed.

A drill rod 1 is connected to an upper portion of the outer tube assembly 11 as a cylindrical body which is successively extended as the drill tube is inserted into the formation. A detachable water swivel is attached to the uppermost end of the drill rod 1. (Not shown) is attached.

[0014] Inside the outer tube assembly 11,
The inner tube assembly 21 is inserted through the drill rod 1. The inner tube assembly 21 is connected to an outer tube assembly by an overshot device (not shown) with a wire cable inserted into the drill rod 1.
11 can be taken out.

The inner tube assembly 21 includes a spear head 22, a spear head body 23, a lock nut 24, a washer 25, a piston packing 26, a washer 27, a coil spring 28, an O-ring 29, a seat 31, a C-shaped retaining ring 32, and a ball. 33, spring pin 34, latch retracting case 35, spring cap 36, coil spring 37, latch body 38, wedge 39, spring pin 40, latch
41, latch pin 42, latch spring 43, spring holder 44, ball 45, spindle 46, shut-off valve 47, valve adjusting washer 48, thrust ball bearing 49, spindle bearing 51, hanger bearing 52, compression spring 53, self-locking Nut 54, inner tube cap assembly
55, an inner tube 56, a core lifter case 57, a core lifter 58, an O-ring 59, a piston 61, and a split tube 62. The relationship between the members is as follows.

As shown in FIG. 1, the spearhead 22
Is a member that engages with the overshot device. The spear head body 23 is formed of an elastic material such as synthetic resin or rubber between the washers 25 and 27 by screwing with the spear head 22 and the lock nut 24. Piston Packing
26 is attached together.

As shown in FIGS. 1 and 2, the piston packing 26 has a fitting hole 64 fitted in the spear head body 23 at the center of a piston body 63 fixed between the washers 25 and 27. On the upper side of the piston body 63 receiving the fluid pressure, a diameter change absorption groove 65 for absorbing a diameter change is formed in an annular shape, and a drill rod 1 is formed on the outer peripheral side of the piston body 63 through the diameter change absorption groove 65. And outer tube adapter 12
By forming a seal portion 66 that is in close contact with the inner peripheral surface of
It has a V-shaped cross section as a whole.

The piston body 63 has a sufficient thickness in the axial direction and the radial direction, and has a base end portion of the seal portion 66.
67 is formed thin by cutting the diameter change absorption groove 65. Further, the outer peripheral surface 68 of the seal portion 66 is formed to gradually increase in diameter upward, so that the sliding operation can be performed smoothly downward and the upper peripheral portion of the seal portion 66 can also slide upward. An annular inclined surface 69 is formed to prevent the hooking of the vehicle.

The outer periphery of the piston packing 26 can be freely radially deformed by the diameter change absorbing groove 65 with respect to the piston body 63 sandwiched between the washers 25 and 27. The seal portion 66 expands its diameter due to the water pressure acting on the outer inner peripheral surface 65a in the diameter change absorbing groove 65 when receiving the hydraulic pressure supplied from the inner surface of the drill rod 1 and the outer tube adapter 12. While maintaining close contact with the surface, it absorbs the change in the inner diameter of the threaded connection between the drill rod 1 and the drill rod 1 and the threaded connection between the drill rod 1 and the outer tube adapter 12 and always maintains the watertight sealing function. it can.

Returning to FIG. 3, holes 71, communicating with the upper space of the piston packing 26 and the lower gap in the radial direction of the shoulder portion of the spear head 22, the axial center portion and the intermediate portion of the spear head body 23. 72 and 73 are provided respectively. Hole 73 is
It is opened and closed by the latch retracting case 35.

The ball 33 is a ball valve formed of stainless steel. The ball 33 is pressed against the seat 31 from above by the coil spring 28, functions as a check valve against a water flow from above, and functions as a check valve against a water flow from below. Function as a relief valve. The seat 31 is locked by a C-shaped retaining ring 32.

The latch retracting case 35 is slidably fitted on the lower peripheral surface of the spear head body 23 and the peripheral surface of the latch body 38, and has spring pins 34 and 40 integrated at upper and lower diameter positions, respectively. It is fitted.

The upper spring pin 34 is movably fitted in a vertically long hole 74 formed in the lower part of the spear head body 23, and the lower spring pin 40 is formed in the latch body 38. It is movably fitted in the elongated hole 75 in the vertical direction.

A spring cap 36 screwed to the upper portion of the latch body 38 is engaged with the lower end surface of the spear head body 23 so as to be able to freely contact and separate therefrom.
Is urged downward.

The wedge 39 has a projecting portion 77 integrally formed on the opposite side of the main body portion into which the spring pin 40 is inserted, and the tip of the projecting portion 77 faces the latch 41.

The latch 41 is formed by stacking a pair of latch bodies 41a and 41b formed in a left-right inverted shape to form a latch body.
A pair of latch main bodies 41a and 41b are rotatably supported by a latch pin 42 inserted into the latch body 38 and fitted in a latch mounting groove 78 formed in the vertical direction at an intermediate portion of 38. .

FIG. 3 shows a state in which the upper portions of the latch bodies 41a and 41b are opened so as to form a U-shaped groove, and the projection 77 of the wedge 39 is fitted into the U-shaped groove.
When the lids 41a and 41b are closed, the projection 77 of the wedge 39 is locked at their upper ends.

Landing ring 16 of outer tube 13
A concave portion 83 is provided on the lower side, and a convex portion 84 provided at the lower part of the latch main bodies 41a and 41b is fitted into the concave portion 83, and rotation of the outer tube 13 is transmitted from the concave portion 83 to the convex portion 84. The data is transmitted to the latch body 38 via the latch main bodies 41a and 41b.

The latch spring 43 causes the pair of latch bodies 41a and 41b to move by a torsion restoring force into a lower projecting portion 84.
Are torsion springs for unlocking which are urged in directions approaching each other.

The spring holder 44 is provided with the latch body 38.
The stainless steel ball 45 is abutted on the inner peripheral surface of the outer tube 13 or the like by a coil spring by a spring protection hole 85 maintained on the central axis by a coil spring. 43 is protected on the central axis.

An upper part of a spindle 46 is screwed to a lower part of the latch body 38 and fixed by a lock nut 24. The shut-off valve 47 fitted to the lower portion of the spindle 46 is a resilient member such as rubber, and is acted on by a thrust ball bearing 49 by filling a split tube 62 with a core cut from the ground. When compressed in the axial direction by the push-up force, the valve member expands and changes in the radial direction, closely contacts the inner peripheral surface of the outer tube 13, and closes the surrounding annular gap.

The spindle 46 includes a hanger bearing 52 and a spindle bearing 51 slidably fitted to a lower portion thereof.
And elastically locked by a compression spring 53. An inner tube cap assembly 55 is screwed into the spindle bearing 51, and an upper portion of the inner tube 56 is screwed into the inner tube cap assembly 55. As shown in FIG. Case 57 is screwed into the inner tube
A split tube 62 that can be divided is provided integrally inside 56.

The piston 61 is a core removal piston, which removes the inner tube assembly 21 to the outside, separates only the inner tube 56, and applies fluid pressure to the piston 61 to move the piston 61 within the inner tube 56. By doing so, the core is pushed out from the inner tube 56 together with the split tube 62.

Next, the operation of the illustrated embodiment will be described.

The inner tube assembly 21 is inserted into the outer tube assembly 11 through the drill rod 1 connected to the upper side of the outer tube assembly 11.
This insertion is performed by water pressure supplied from an external pump to the inside of the drill rod 1 via a water swivel (not shown) attached to the uppermost end of the drill rod 1.

When the inner tube assembly 21 is inserted, the pair of latch bodies 41a and 41b are closed by the latch spring 43, and the upper end of the latch bodies 41a and 41b is brought into contact with the projection 77 of the wedge 39. It is set to the release state.

In this case, since the wedge 39 compresses the upper coil spring 37 and retreats, the latch retracting case 35 connected to the wedge 39 via the spring pin 40 is moved upward with respect to the spear head body 23. The hole 73 is closed by relative movement.

As described above, since the hole 73 is closed by the latch retracting case 35 and the seat 31 is also closed by the ball 33, the water pressure acts on the spear head 22, the piston packing 26 and the like from above, and the spear head body
Push down the latch body 38 through 23.

At this time, as shown in FIG. 1, the piston packing 26 absorbs the change in the inner diameter of the drill rod 1 or the outer tube adapter 12 with respect to the fixed piston body 63 by the diameter change absorbing groove 65. Diameter change absorption groove
The water pressure acting on the inner peripheral surface 65a of the 65 allows the seal portion 66 to be always in close contact with the inner peripheral surface of the drill rod 1 or the outer tube adapter 12 to maintain water tightness.

This water pressure inner tube assembly
By the lowering operation of 21, immediately before the convex portion 81 provided annularly on a part of the outer peripheral surface of the latch body 38 is locked at the upper portion of the landing ring 16, the upper engaging portions of the latch main bodies 41 a and 41 b are engaged. 82 hits the landing ring 16 and the latch main body 41a
Rotates clockwise, and the latch body 41b rotates counterclockwise.

As a result, as shown in FIG. 3, the projections 84 of the latch bodies 41a and 41b are engaged with the concave portions 83 below the landing ring 16, and the latch bodies 41a and 41b are engaged.
A U-groove is formed between the upper portions of the U-shaped grooves, and the projecting portion 77 of the wedge 39 is inserted into the U-shaped groove, and the wedge-inserted state is maintained by the compression repulsive force of the coil spring 37.

Thus, the outer tube assembly 11 and the inner tube assembly 21 are integrated at a predetermined position. The operation of inserting the wedge 39 into the U groove between the latch main bodies 41a and 41b involves the downward movement of the latch retracting case 35 via the spring pin 40, and the hole 73
, The water above the spear head 22
It passes through the outer peripheral gaps of the members located below the holes 72, 73, and 73, and is ejected from a hole 86 formed in the bit 15.

Then, the outer tube assembly 11
When it is lowered while rotating by the rotational force and the axial thrust applied to the drill rod 1 connected to the upper side, the core cut from the rock by the bit 15 is collected into the split tube 62 through the core lifter case 57. Is done.

When the core is filled in the split tube 62, the outer tube assembly 11 is pulled slightly upward through the drill rod 1 and the lower end of the core is broken by the core lifter 58.

The water swivel attached to the uppermost end of the drill rod 1 is once removed, and an overshot device (not shown) with a wire cable is attached to the drill rod 1.
And the water swivel is attached again to supply water pressure, and the overshot device is moved in the drill rod 1 by water pressure to collide with the spear head 22 in the outer tube adapter 12. The overshot device engages the spear head 22 so as to grip it.

The spear head body 23 is pulled up through the spear head 22 by pulling the wire cable of the overshot device from the outside, and the latch retractor is pulled through the spring pin 34 engaged with the elongated hole 74 of the spear head body 23. The cutting case 35 is pulled up, the wedge 39 is pulled up via the spring pin 40, and the projection 77 of the wedge 39 can be pulled out from the U groove of the latch 41.

The U-shaped groove of the latch 41 is
Is pulled out by the restoring force of the latch spring 43, the latch bodies 41a and 41b are disengaged from the landing ring 16, and the integration of the outer tube assembly 11 and the inner tube assembly 21 is released.

The spring pin 40, which has pulled up the wedge 39 by pulling the wire cable, is connected to the latch body 38.
The inner tube assembly 21 can be withdrawn from the outer tube assembly 11 via the drill rod 1 by continuing to pull the wire cable. At this time, the inner tube assembly 21
The water above the hole passes through the outer circumferential gaps of the members located below the holes 71, 72, 73 and 73, and alleviates the vacuum phenomenon generated in the drill rod below the inner tube assembly 21.

After taking out the collected core, the inner tube assembly 21 is returned to the outer tube assembly 11 via the drill rod 1 by water pressure again, and the core cutting operation is resumed.

The spring holder 44 may be formed separately from the latch body 38, or may be formed integrally with the latch body 38 from the beginning. Also, piston 61
And the split tube 62 etc.
In some cases, it is used without being incorporated into the device.

Further, the present invention is not limited to the piston packing 26 mounted on the inner tube assembly 21, but can be applied to, for example, a piston packing mounted on an outer peripheral portion of an overshot device.

[0052]

According to the first aspect of the present invention, since the seal portion is provided to the piston body via the diameter change absorbing groove, the seal portion is absorbed while absorbing the change in the inner diameter of the cylindrical body by the diameter change absorption groove. Can always be brought into close contact with the inner peripheral surface of the cylindrical body. For example, the piston device can be applied to a cylindrical body in which the inner diameter must be changed in order to keep the outer diameter constant.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an upper portion of an outer tube assembly and an inner tube assembly on which a piston device according to the present invention is mounted.

FIG. 2 is a perspective view of the piston device.

FIG. 3 is a cross-sectional view showing an upper part of a wire line core barrel to which the piston device is mounted.

FIG. 4 is a cross-sectional view showing a lower portion of the core barrel.

FIG. 5 is a side view of the outer tube assembly connected to a drill rod.

FIG. 6 is a sectional view showing an example of a drill rod.

FIG. 7 is a sectional view showing another example of a drill rod.

[Explanation of symbols]

 12 Outer tube adapter as a cylinder 63 Piston body 65 Absorption groove for diameter change 66 Seal

Claims (1)

[Claims] 1. A piston device that operates in at least one direction by receiving a fluid pressure in a cylinder, wherein the piston body is movably fitted to the cylinder, and is formed annularly on a side of the piston body that receives the fluid pressure. A piston device comprising: a diameter change absorption groove for absorbing a diameter change; and a seal portion formed on the outer peripheral side of the piston body through the diameter change absorption groove and in close contact with the inner peripheral surface of the cylindrical body. .