JPH0221006A - Cylinder device - Google Patents

Abstract

PURPOSE:To make one cylinder device capable of driving various valves to open and close by composing a rotational shaft of a 1st shaft piece having an engaging part at one end in the axial direction, and a 2nd shaft piece having an engaging part which engages with the engaging part of the 1st shaft piece at one end in the axial direction. CONSTITUTION:A rotational shaft is composed of a 1st shaft piece 6, 2nd shaft piece 4, and 3rd shaft piece 5. A recessed hole 61 which engages with the stem of a valve is formed at the lower end of this 1st shaft piece 6, and a protruding part 52 is formed at the upper other end. Also, a recessed hole 41 that engages with a protruding part 62 is formed at the lower one end of the 2nd shaft piece 4. Thereby one cylinder device is made capable of driving various valves to open and close as various sizes of engaging part of the steam of valve can be dealt with adjustment of only one shaft piece to that engaging part.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a small cylinder device for opening and closing a valve such as a ball valve.

[Prior Art] Cylinder devices are increasingly being used as drive devices to open and close valves such as ball valves used in small-diameter piping, such as 1/8B to IB, and this cylinder device must be small and inexpensive. is desired. -There are various types of cylinder-based valve drive devices for boat fishing, such as yaw type, rack-pinion type, and link type.These types of cylinder-based valve drive devices have the problem of being relatively large. .

A small cylinder-based valve driving device is a cylinder device disclosed in Japanese Patent Application Laid-Open No. 141408/1983, which is shown in FIG.

As shown in FIG. 4, the rotating shaft 40 has a substantially cylindrical shape, and has two rows of circumferential grooves SL, S2. is formed, and the groove S1
．． An axial groove 15 connecting the groove 82 and the groove 82 is formed. Furthermore, a groove Sl and a groove 82 having the same shape as these grooves Sl, groove S groove length 2, and groove 15 are provided at symmetrical positions with respect to the central axis of the rotating shaft 40.
and grooves 15 are formed.

The pistons 2 and 3 have the same shape, and the piston 2 has a disc part 2a, a plate-shaped extension part 2b that extends part of the circumferential surface of the disc part 2a in the axial direction, and an axis inside this extension part 2b. It consists of two brackets 2C parallel to and spaced apart from each other, and a shaft 2d fixed to these brackets in a perpendicular direction.

The cylinder body 1 is a cylindrical block with an inner peripheral surface having a circular cross section, and a through hole 50 in a direction perpendicular to the circular axis is located at the center of the cylinder body 1. Insert and fit the rotating shaft 40 into the through hole 50 of the cylinder body 1.
The piston 2 is fitted on one side of the through hole 50, and the piston 3 is fitted on the other side. At this time, the rotating shaft 4
Groove 14. The shafts 2d, 3d of the pistons 2, 3 are fitted into the grooves 15, and at the same time the grooves 81. The brackets 2c and 3c of the pistons 2 and 3 fit into the grooves S2, respectively. Here, the reciprocating motion of the pistons 2 and 3 in the axial direction of the cylinder body is converted into the forward and reverse rotational motion of the rotary shaft 4.

The conventional cylinder device described above has a piston '2.
3 brackets 2C, 3C and shafts 2d, 3d are rotation shafts 4
0 grooves 81, 82 and 15, and the cylinder device itself has a rotating shaft 40 that rotates forward and backward, so it is small as a valve driving device using a cylinder. .

[Problems to be Solved by the Invention] When the conventional cylinder device described above is connected to a valve, the rotation shaft of the valve, that is, the valve stem, and the rotation shaft of the cylinder device are connected. This connection is often made by fitting a concave or convex part of the rotating shaft into a convex part or concave part of the valve stem.

Therefore, it is necessary to match the dimensions of the lower end of the rotating shaft of the cylinder device to the upper end of the valve stem of the valve. The rotating shaft of the cylinder device has dimensions that match the cylinder body, and a groove that matches the piston is formed on the outer circumferential surface, and the lower end of this rotating shaft needs to be shaped and dimensioned to match the valve stem. There is.

That is, the entire axis of rotation of the cylinder device must match the valve stem.

An object of the present invention is to provide a cylinder device having a rotating shaft that does not require the entire rotating shaft to fit the valve stem.

[Means for Solving the Problems] The present invention is a cylinder device in which a rotating shaft is divided into upper and lower parts in the axial direction, and includes a cylindrical cylinder main body, a rotating shaft in which a groove is formed in the axial direction on the circumferential surface, It consists of a disk-shaped pressure receiving part, a plate-shaped arm part with a part of the circumference of this pressure receiving part extending in the axial direction, a piston consisting of a bracket formed inside this arm part, and a pin fixed to this bracket, The rotating shaft is disposed inside the cylinder body in a direction perpendicular to the cylinder body axis, and the piston is fitted into the inner circumferential surface of the cylinder main body so that the pin of the piston fits into the groove of the rotating shaft. In the cylinder device that converts reciprocating motion of a piston into forward and reverse rotational motion of the rotating shaft, the rotating shaft includes a first shaft piece having a concave or convex fitting portion at one axial end, and a first shaft piece having a concave or convex fitting portion at one axial end. This cylinder device is characterized by comprising a second shaft piece having a concave or convex fitting portion that fits into the fitting portion of the first shaft piece.

[Operation] Since the cylinder device according to the present invention has its rotating shaft divided into upper and lower parts in the axial direction, only the lowermost shaft piece needs to be aligned with the valve stem of the valve.

[Example] Hereinafter, one embodiment of the present invention will be described based on the drawings.

FIG. 1 shows an exploded view, partially in cross section, of the cylinder device of this embodiment, and the shape of the cylinder device is generally different from the shape of a conventional cylinder device in terms of rotational axes. The cylinder body 1 and the two lids 2, 2 are made of polypropylene, the two pistons 3.3 installed in the cylinder body 1 are made of polycarbonate, and the second shaft piece 4 of the rotating shaft is made of polycarbonate. Third shaft piece 5. The first shaft piece 6 is made of polyimide, and each part is molded from an engineering plastic material or a general-purpose plastic material. The rotation axis is the first
Shaft piece 6. Second shaft piece 4. It consists of a third shaft piece 5, and each shaft piece is in a separate state until temporary assembly, and is integrally molded in large quantities by injection molding.

As shown in the figure, one lower end of the first shaft piece 6 is formed with a recessed hole 61 that fits into the valve stem of the valve, and the other upper end is formed with a convex part 62 that fits into the recessed hole 41 of the second shaft piece. has been done. There is an O-ring groove 63 on the circumferential surface between the concave and convex fitting parts, and the O-ring 12 is mounted thereon. The second shaft piece 4 has a recessed hole 41 formed at one lower end thereof, and a recessed hole 42 into which the convex portion 51 of the third shaft piece 5 is fitted at the other upper end thereof. A circumferential space 43.44 having a depth in the radial direction in two stages, upper and lower, on the intermediate circumferential surface of the second shaft piece 4.
In addition, an axial cut groove 45 having a depth in the radial direction is also formed in the partition wall that partitions the spaces 43 and 44. This is a groove 45 in which the pin and roller of the piston 3, which will be described later, engage.

Next, the third shaft piece 5 has the above-mentioned convex portion 51 at one end on the lower side, and has a parallel two-handed surface portion 52 on the other end on the upper side into which a tool for manual rotation drive operation can be fitted, for example.

There is an O-ring groove 53 on the circumferential surface between these, into which the O-ring 13 is fitted.

The pistons 3.3 have the same shape (one piston 3 will be explained below), and includes a disc-shaped pressure receiving part 31 that receives fluid pressure, and a plate-shaped part that extends in the axial direction from a part of the circumferential side of this pressure receiving part 31. It has an abbreviated shape consisting of an arm portion 32. A member 14 with a small friction coefficient is provided on the outer peripheral surface of the tip portion of the arm portion 32.
is pasted, and two brackets 33, 33 are formed to protrude from the inner side and on the opposite side parallel to the axial direction. The roller 8 is fitted to press vertically between the two brackets 33°33.

The cylinder main body 1 is a cylindrical block with an inner circumferential surface having a circular cross section, and a through hole 19 is provided at the top and bottom in the center so that the above-mentioned rotating shaft can be inserted and fitted in a direction perpendicular to the axis. Furthermore, the cylinder body 1 has a connection port P2 similar to the connection port PL through which pressure fluid enters and exits. As shown in FIG. 2, the connection port PL communicates with a central chamber A formed by the inner peripheral surface of the cylinder body 1 between the pistons 3 when the pistons 3 are fitted into the cylinder body 1. On the other hand, the access port P2 is a right chamber formed between the piston 3 and the lid 2 at one end on the inner peripheral surface of the cylinder body 1, and a right chamber formed between the other piston 3 and the lid 2 at the other end on the inner peripheral surface of the cylinder body 1. It communicates with a passageway 25 formed between the left ventricle and the left ventricle.

The order of assembling each component of the cylinder device of this embodiment described above into the cylinder device will be explained. First, the third shaft piece 5 of the rotating shaft. Second shaft piece 4. The first shaft piece 6 is temporarily assembled in this order, and this is done by fitting the convex or concave fitting parts at the upper and lower ends of each shaft piece, respectively.After this, electric current is passed through both ends of the rotating shaft, so that Only the joints of the shaft pieces are melted and bonded by the resistance heat generated in the fitting parts of the projections and recesses, and at the same time, they are integrated by applying pressure. Then, this rotating shaft is inserted into the through hole 19 of the cylinder body 1 and fitted. At this time, the O-ring 13 attached to the third shaft piece 5 and the O-ring 12 attached to the first shaft piece 6 seal the rotating shaft and the cylinder body 1. Next, the arm 32 of the piston 3.3
Insert it into the circular inner circumferential surface of the cylinder body 1 with the side facing forward. At this time, the two brackets 33.3 of the piston 3
3 is the space of the rotation axis 43. The rollers 8 are fitted into the spaces 44, and at the same time the rollers 8 fitted onto the pins 7 of the piston 3 are fitted into the grooves 45 of the rotating shaft. After this, the lids 2, 2 are fitted with the protrusion 15 on the cylinder body 1 side and the hole 22 on the lid side via the O-rings 10, 10, and in the same way as the fixing shaft was welded, the lids at both ends are melted and crimped by applying an electric current to seal them. Assemble as a cylinder device.

When pressure fluid is supplied to the connection port PL of this cylinder device and the pressure fluid is removed from the connection port P2, the pressure in the central chamber A increases and the pistons 3.3 are moved away from each other. Conversely, when pressure fluid is removed from the connection port PL and pressure fluid is supplied to the connection port P2, the piston 3.
3 move closer to each other. i.e. piston 3
．． 3 makes a reciprocating motion. Further, the screw 17 is a screw for mounting a solenoid valve or the like that switches the supply and discharge of pressure fluid. 16 is the flange part where the ball valve is attached, and there are two screw holes (
(not shown) The screw 18 is a connecting screw hole when the cylinder devices are mounted in two stacks.

In the cylinder device of this embodiment described above, the rotating shaft is divided into three parts, so even if the dimensions of the fitting part of the valve stem vary, only the first shaft piece 6 that matches the fitting part size is changed. There is no need to change the entire rotation axis. In this case, the second shaft piece 4 and the third shaft piece 5 of the rotating shaft may be integral from the beginning. Further, the parts constituting the cylinder device may be made of metal, for example, instead of engineering plastic or general-purpose plastic. However, when the rotating shaft is made of metal, it is difficult to connect each shaft piece by welding, so it is necessary to tightly fit the fitting portions.

Next, FIG. 3 shows two cylinder devices 1a and 1b of FIG. 1 stacked one on top of the other and mounted on a ball valve. In Figure 3, the valve stem of the ball valve and the cylinder device 1
The first shaft piece 6 of a is fitted and connected to connect the main body of the ball valve and the flange portion 1B of the cylinder device 1a. Further, the upper end fitting portion of the third shaft piece 5 of the cylinder device 1a and the lower end fitting portion of the first shaft piece 6 of the cylinder device 1b are connected, and the screw 18 portion of the cylinder device 1a and the cylinder device 1b are connected.
and the flange portion 1B.

A cylinder device in which the same cylinder device 1a as shown in FIG. That is, by manufacturing one type of cylinder device, it can be installed in a ball valve that requires twice as much torque. The cylinder device of the embodiment shown in FIG. 3 has the effect of being able to accommodate many types of ball valves even if the number of types is small.

[Effects of the Invention] In the cylinder device according to the present invention, the shaft pieces of the rotating shaft are integrated when the cylinder device is assembled. This can be done by aligning only the part with the fitting part. That is, 1
A single cylinder device can open and close many types of valves.

[Brief explanation of the drawing]

Fig. 1 is an exploded perspective view of a cylinder device showing one embodiment of the present invention, Fig. 2 is a cross-sectional view of the same, and Fig. 3 shows a case where the cylinder device of this embodiment is stacked in two stages and installed in a ball valve. FIG. 4 is an exploded perspective view showing a conventional cylinder device. 1... Cylinder body, 2... Lid. 3... Piston, 4... Second shaft piece. 5... Third shaft piece, 6... First shaft piece. 7...pin, 8...roller. Figure 2

Claims (1)

[Scope of Claims] 1) A cylindrical cylinder body, a rotating shaft having a groove formed in the axial direction on the circumferential surface, a disc-shaped pressure receiving part, and a part of the circumference of the pressure receiving part extending in the axial direction. The piston includes a plate-shaped arm, a bracket formed inside the arm, and a pin fixed to the bracket, and the rotating shaft is disposed inside the cylinder body in a direction perpendicular to the axis of the cylinder body. , a cylinder device in which the piston is fitted into the inner circumferential surface of the cylinder body, and a pin of the piston is fitted into a groove of the rotating shaft to convert reciprocating motion of the piston into forward and reverse rotational motion of the rotating shaft, The rotating shaft includes a first shaft piece having a concave or convex fitting portion at one axial end, and a concave or convex fitting portion that fits into the fitting portion of the first shaft piece at one axial end. A cylinder device comprising: a second shaft piece having a second shaft piece;