JPS6234002Y2 - - Google Patents

Description

[Detailed explanation of the idea]

(Field of Industrial Application) The present invention relates to an improvement of a rotary cylinder. (Prior art) A metal cylinder main body with fixed side vanes stretched in the radial direction on the inner surface is sandwiched between upper and lower cover plates connected by a plurality of tie rods, and a movable side vane is placed inside the cylinder main body. A rotary type cylinder that uses fluid pressure and is installed so that it can rotate back and forth was developed in 1977.
It is widely known from Publication No. -99293. (Problems to be solved by the invention) By the way, the most important point in this type of rotary cylinder is the prevention of fluid leakage, especially:
The purpose is to reliably prevent fluid leakage between both ends of the cylinder main body and both lid plates. Therefore, in conventional rotary cylinders of this type, Figs.
As shown in the figure, the movable wing plate 1 is attached to the cover plates 11, 11.
2 are provided with annular grooves 14, 14 whose groove width is narrower than the wall thickness of the cylinder main body 13, and a gasket 15 is fitted into each annular groove 14, and the gasket 15 is used to connect the cylinder main body 13 with the gasket 15. Although it is designed to prevent fluid from leaking between the cover plates 11, it may not be possible to completely prevent the leakage of fluid between the cover plates 11 unless the finishing of both end faces of the cylinder main body 13, the surface of the cover plate that contacts this, the annular groove, etc. is done with sufficient precision. For this reason,
In FIG. 4, the fixed wing plate 16 and the movable wing plate 12
When high-pressure fluid such as compressed air is supplied to one chamber A partitioned by , and the other chamber B is released to the atmosphere, the movable wing plate 12 rotates clockwise, but internal leakage occurs as shown by arrow a. The differential pressure between one chamber (A) on the high pressure side and the other chamber (B) on the low pressure side becomes small, resulting in output loss. Also, Patsukin 15
Since this deteriorates during use, if the sealing performance deteriorates, external leakage will occur around the entire circumference of the packing 15, resulting in an output loss. Therefore, the seal using the gasket 15 requires dimensional accuracy, which increases the manufacturing cost, and the gasket must be replaced frequently, resulting in high running costs, among other problems. (Means for Solving the Problems) The present invention not only solves the above-mentioned problems and reliably prevents air leakage from the inside of the cylinder to the outside, but also provides a structure that is partitioned by a fixed side blade plate and a movable side blade plate. It was completed with the aim of creating a rotary type cylinder that can reliably prevent internal leakage from one chamber to the other, and is made of metal with a hardness of _HB 150 to 200, with fixed side vanes stretched in the radial direction on the inner surface. A cylinder main body made of material, and peripheral parts at both ends of the cylinder main body.
Upper and lower lid plates made of a metal material with hardness H _B 65 to 95 that close the openings at both ends by direct contact with a surface pressure of 9.5 Kg/mm ² or more, and a lid plate provided between the lid plates on the outside of the cylinder main body to close the openings at both ends. a plurality of tie rods that clamp and hold the cylinder main body between the cover plates; a plurality of tie rods having a coefficient of thermal expansion substantially equal to that of the cylinder main body; The cylinder body is characterized by comprising a movable wing plate whose tip edge is brought into contact with the inner surface of the cylinder main body. (Embodiment) Next, the present invention will be described in detail with reference to the embodiment shown in FIGS. Hardness H _B 150 ~ when concave steps 1a, 1a are formed
The cylinder main body is made of No. 200 carbon steel, and 4, 4 are upper and lower lid plates for closing the openings at both ends of the cylinder main body 1 by bringing their peripheral portions into direct contact with both ends of the cylinder main body 1. The hardness of the cover plates 4, 4 is H _B 65~
It shall be made of soft metal material such as 95 aluminum alloy. Reference numeral 5 designates a plurality of tie rods which are provided between the cover plates 4, 4 on the outside of the cylinder main body 1 and clamp the cylinder main body 1 between the cover plates 4, 4. Each tie rod 5 has a coefficient of thermal expansion that is equal to that of the cylinder. The cylinder is made of the same material as the cylinder main body 1 so that the coefficient of thermal expansion is approximately equal to that of the main body 1.Through the stepped hole 6 provided in the upper cover plate 4, the threaded hole 7 provided in the lower cover plate 4 is inserted. By screwing in the threaded portion 5a at the tip and positioning the head 5b in the stepped hole 6, the cover plates 4, 4 and both ends of the cylinder main body 1 are brought into direct contact with each other. Reference numeral 8 denotes a movable wing plate provided in the cylinder main body 1 so as to be able to reciprocate. ,4
The shaft portion 9 is brought into contact with the tip edge 2 of the fixed side vane plate 2, and the tip edge 8 is brought into contact with the inner surface of the cylinder main body 1, and in this way, the movable side blade plate 8 and chambers A and B partitioned by the fixed side vane plate 2 are formed. In addition, 1 in the figure
0 and 10 are fluid intake and discharge pipes, 4a and 4a are cover plates 4,
The annular recess 4a is formed as necessary on the peripheral edge of the opposing surface of the cylinder body 4, and the annular recess 4a is formed with the end edge of the cylinder main body 1 when the recess step 1a of the cylinder main body 1 is brought into contact with the cover plate 4. A gap is formed between them so that the cylinder main body 1, which is clamped and held between the cover plates 4 and 4 by the tie rod 5, can easily bite into the cover plates 4 and 4. (Function) In the cylinder main body 1 whose openings at both ends are closed by the cover plates 4, 4, one chamber is partitioned by the fixed wing plate 2 and the movable wing plate 8, and one chamber is separated from the other by the fixed wing plate 2 and the movable wing plate 8. High-pressure fluid is supplied through the suction and exhaust pipe 10 of the other chamber, and the other chamber is connected to the other suction and exhaust pipe 1.
When released to the atmosphere by 0, the movable wing plate 8 rotates clockwise, and also connects one chamber A to one suction/exhaust pipe 1.
When high pressure fluid is supplied to the other chamber RO through the other suction and exhaust pipe 10, the movable side vane plate 8 rotates counterclockwise.
Conventional rotary cylinders of this type utilize the forward and reverse rotation of the protruding end 9 of the shaft 9 to provide a power source for rotational movement or opening/closing movement at limited angles in various types of equipment. Similarly, in the present invention, the cylinder main body 1 is made of metal with a hardness of _HB 150 to 200, while the cover plates 4, 4 are made of a metal material with a hardness of _HB 65 to 95, which is softer than the cylinder main body 1. As a matter of fact,
A tie rod 5 made of a material whose coefficient of thermal expansion is approximately the same as that of the cylinder main body 1 creates a gap of 9.5 mm between the cover plates 4 and 4.
Since the seal structure is based on metal contact in which both ends of the cylinder main body 1, which is clamped and clamped with a surface pressure of Kg/mm ² or more, are brought into close contact with the lid plates 4, 4, it is possible to press them against the lid plates 4, 4. Fluid leakage between the cylinder main body 1 and the cover plates 4 and 4 can be prevented without using gaskets, including not only leakage from the inside of the cylinder to the outside, but also internal leakage from one chamber A to the other chamber B. It can be prevented accurately, and therefore, there is no need to cut an annular groove for fitting the gasket, which is required when using gaskets, and it can be provided at a low cost.
There is no need to replace the gaskets, so maintenance and inspections do not require much effort. Moreover, the cylinder main body 1
The coefficients of thermal expansion of the cylinder main body 1 and the tie rod 5 are substantially the same, and therefore, there is no possibility that the cylinder main body 1 or the tie rod 5 will expand or contract differently due to temperature changes during use, causing a large change in surface pressure and impairing the sealing effect. In addition,
The hardness of the cylinder main body 1 and tie rod 5, the cover plate 4,
The hardness or surface pressure of No. 4 was limited to the above values because
This is because it has been experimentally confirmed that other combinations of hardness will not only cause durability problems but also have insufficient sealing effects, and that the desired purpose can only be achieved with the above-mentioned values. 4 is made of aluminum alloy (hardness _HB 65-95), cylinder main body 1 and tie rod 5 are made of mechanical structural carbon steel (hardness _HB 150-200), and chromium-molybdenum steel with a coefficient of thermal expansion approximately equal to this. Board 4, 4
According to an airtight performance confirmation test in which the surface pressure between the main body 1 and the cylinder main body 1 was varied from 7.38 to 19.1 Kg/mm ² and an air pressure of 18 Kg/cm ² was applied from the intake/exhaust pipe 10, it was found that the assembly takes cylinder maintenance into consideration. It has been confirmed that during the number of dismantling operations, that is, 10 times, which is considered to be the maximum number of repeated tightening of the mounting bolts, there was no leakage at all under a surface pressure of 9.5 kg/mm ² or more, and it was extremely effective. Next, the results of measuring the amount of cylinder air leakage from one chamber A to the other chamber B and from the other chamber B to one chamber A are shown in the table below. In this measurement method, the cylinder was assembled and disassembled 20 times in consideration of cylinder maintenance, and the leakage amount was measured each time: the first time, the 5th time, the 10th time, the 15th time, and the 20th time. As a result, it can be seen that good sealing performance can be obtained if the seal surface pressure is approximately 9.5 kg/mm ² or more, assuming that the maximum number of times the cylinder can be maintained and reassembled is 10 times. Please note that the gap between the seal
If it is 0.07 to 0.14 mm, the internal air leakage rate will reach 68 to 198/min.

[Table] (Effects of the invention) As is clear from the above explanation, the invention has the following effects:
The cover plate that closes the openings at both ends of the cylinder main body is made of a metal material with a hardness of H _B 65 to 95, which is softer than the cylinder main body, and the cylinder main body is made of a metal material with a hardness of H _B 150 to 200, which is much harder than the cover plate. In addition, since the tie rod has approximately the same coefficient of thermal expansion as the cylinder main body, the contact surface between the cylinder main body and both cover plates pressed together by the tie rod is moderately softer than the cylinder main body. The cover plate fits well with the end surface of the main cylinder,
Since the joint surfaces are in close contact and appear as if they were a single metal joint, the structure is simpler and the work is not only simpler than the conventional one, which uses synthetic rubber as a gasket to maintain airtightness, but also makes it easier to replace the gasket. Since there is no need for it, maintenance becomes easier, and it also reliably prevents not only external leakage from inside the cylinder, but also internal leakage from one chamber to the other, which could not be prevented with conventional packing seals. It has various advantages such as being able to exhibit a highly reliable sealing effect over a long period of time, and is of great practical value as a solution to the problems of conventional rotary cylinders of this type.

[Brief explanation of the drawing]

FIG. 1 is a partially cutaway front view showing an embodiment of the present invention, FIG. 2 is a partially cutaway plan view, FIG. 3 is a partially cutaway front view showing a representative example of a conventional rotary cylinder, and FIG. The figure is a partially cutaway plan view, and FIG. 5 is a chart showing the relationship between seal surface pressure and air leakage amount. 1: Cylinder main body, 2: Fixed side wing plate, 4: Lid plate, 5: Tie rod, 8: Movable side wing plate, 9: Shaft part.

Claims (1)

[Scope of utility model registration request] A cylinder main body 1 made of a metal material with a hardness H _B of 150 to 200, with fixed side vanes 2 stretched in the radial direction on the inner surface.
And, the peripheral part at both ends of the cylinder main body 1 is 9.5 mm.
The upper and lower cover plates ⁴ , 4 are made of a metal material with a hardness of HB 65 to 95, and are made of a metal material with a hardness of _HB 65 to 95, which are brought into direct contact with each other with a surface pressure of Kg/mm 2 or more to close the opening at both ends. a plurality of tie rods 5, which are provided between the lid plates 4, 4 and which clamp and hold the cylinder main body 1 between them;
A movable wing plate 8 is provided in the cylinder main body 1 so as to be rotatable in a reciprocating manner so that the shaft portion 9 contacts the tip edge of the fixed side wing plate 2 and the tip edge contacts the inner surface of the cylinder main body 1. A rotary cylinder characterized by: