JPH0333883B2 - - Google Patents

Description

[Detailed description of the invention] (Industrial application field) The present invention relates to a forward/reverse air motor.

(Prior Art) Air motors have been commonly used as explosion-proof drive devices for opening and closing valves in chemical factories, oil refineries, and the like. In such cases, it is necessary to rotate the air motor in both forward and reverse directions, and to do so, a separate air control device for forward and reverse rotation is provided between the air source and the air motor, which is equipped with a switching valve, a pilot valve, etc. It was normal.

(Problem to be solved by the invention) However, according to the above conventional configuration, the separate installation of the forward/reverse air control device complicates the structure of the entire equipment and the air piping, resulting in an increase in weight. In addition to this, there was also the problem of frequent failures due to air leaks, etc.

The present invention has been made to solve these problems and to provide a forward/reverse air motor with a simple structure and air piping.

(Means for Solving the Problems) As a means for solving the above-mentioned problems, the present invention provides a plurality of cylindrical blades arranged radially on the outer peripheral surface within the eccentric hollow hole of the cylindrical motor case. An air motor in which a rotor that can be moved in and out is supported on a shaft so that it can rotate in both forward and reverse directions, has a main cylinder and a pilot cylinder inside, a pair of main air supply passages for forward and reverse rotation, and a pair of main air passages for forward and reverse rotation. A valve case having auxiliary air supply passages formed therein is fixed to the motor case, and each of the eccentric air supply passages has one end opening to the outside of the valve case, and the other end opening to the main center via the main cylinder. The two auxiliary air supply passages are connected to the air holes, and the two auxiliary air supply passages are branched from the main cylinder upstream side of the two main air supply passages, which correspond to the forward and reverse directions, and are connected to one end of the main cylinder after passing through the pilot cylinder. A main valve that simultaneously opens and closes both the main air supply passages is slidably inserted into the main cylinder, and a compression spring that presses the main valve is provided at the other end of the main cylinder. A pilot valve for alternately opening and closing both of the auxiliary air supply passages is slidably inserted into the pilot cylinder.

(Function) In the configuration of the present invention, in order to rotate the air motor in the forward direction, the open end of the main air supply path for forward rotation is communicated with the air source by an external switching valve, and the open end of the main air supply path for reverse rotation is communicated with the air source. open to the atmosphere. The compressed air that flows into the main air supply path for forward rotation from the air source is first divided into the auxiliary air supply path for forward rotation and flows into the pilot cylinder, which operates the pilot valve and supplies the auxiliary air supply path for forward rotation. Open the air supply path and close the auxiliary air supply path for reverse rotation. The compressed air that has activated the pilot valve flows into the main cylinder via the opened auxiliary air supply path for forward rotation, operates the main valve, and simultaneously opens both the main air supply path for forward rotation and reverse rotation. Next, the remainder of the compressed air that has flowed into the main air supply path for normal rotation flows into the main cylinder and is supplied into the eccentric hollow hole of the motor case via the opened main air supply path for normal rotation. This compressed air acts on one side of the blade to rotate the rotor in the forward direction, and is then discharged into the atmosphere from a main exhaust passage formed separately in the motor case. At that time, the exhaust gas remaining in the eccentric hollow hole without being exhausted flows back into the main air supply path for reverse rotation, which is opened as the rotor rotates, and passes through the main cylinder to the main air supply path for reverse rotation. is discharged into the atmosphere from the open end of the Further, in order to rotate the air motor in reverse, compressed air is supplied to the main air supply path for reverse rotation using the switching valve, and the main air supply path for normal rotation is opened to the atmosphere. The pilot valve operates in the opposite direction in the case of forward rotation, and the main valve opens both main air supply passages in the same way as in the case of forward rotation. The compressed air flows into the eccentric hollow hole through the main cylinder and acts on the other side of the blade, causing the rotor to rotate in the opposite direction.

(Example) Hereinafter, an example of the present invention will be described based on FIGS. 1 to 3.

Reference numeral 1 denotes a forward and reverse air motor, which is composed of an air motor section 1a and a forward and reverse rotation device section 2. In the air motor section 1a, an inner cylinder 4 is fitted into a hollow hole 3a of a cylindrical motor case 3, and a front end plate 5 and a rear end plate 6 are fixed to both front and rear ends of the inner cylinder 4, and the eccentricity of the inner cylinder 4 is fixed. A rotor 7 is fitted in the hollow hole 4a so as to be rotatable in both forward and reverse directions. A front cover 8 and an end cover 9 are fixed to both front and rear end surfaces of the motor case 3. Each end plate 5, 6 has a disk part 5a, 6a and a boss part 5, respectively.
b, 6b, and seals both ends of the eccentric hollow hole 4a. The rotor 7 has a cylindrical rotor body 1
A flat plate-like blade 11 is inserted into and out of a plurality of slots 10a formed in the radial direction on the outer peripheral surface of the rotor body 10, and rotor shafts 10b and 10c protruding from both front and rear end surfaces of the rotor body 10 serve as bearings 12. They are rotatably supported by the boss portions 5b, 6b of the end plates 5, 6, respectively, via the respective end plates 5, 6.
The rotor shaft 10b projects outside the front cover 8 and transmits power. The reversing device 2 has a main cylinder 14 and a pilot cylinder 15 formed in a valve case 13 fixed to the upper surface of a motor case 3, and each cylinder 14, 15 is provided with a main valve 16 and a pilot valve 17, respectively. It becomes. The main cylinder 14 has a bush 18 fitted into the hollow hole 13a of the valve case 13, and two cylinder covers 19 and 20 fixed to both end faces. The main valve 16 has a shaft portion 16
a piston part 1 having an O-ring 21 on the outer peripheral surface;
6b and a pair of forward and reverse rotation air supply valve parts 16
c and 16d, which are slidably inserted into the bush 18. Reverse air supply valve part 1
A compression spring 2 is installed between 6d and the cylinder cover 20.
2 is interposed to urge the main valve 16 toward the cylinder cover 19 side. Pilot cylinder 1
5 has a bush 23 fitted into the hollow hole 13b of the valve case 13, and two plugs 24 at both ends.
is screwed on. The pilot valve 17 has a pair of forward rotation and reverse rotation operating valve sections 17b and 17c formed at both ends of a shaft section 17a, and is slidably inserted into the bush 23. In the air motor section 1a and the forward/reverse rotation device section 2, pairs of various compressed air passages for rotating the air motor 1a in both forward and reverse directions are formed as follows. The valve case 13 includes a pair of main air supply passages 2 for forward rotation and reverse rotation.
5a, 25b, a pair of forward rotation and reverse rotation auxiliary air supply passages 26a, 26b, and a pair of forward rotation and reverse rotation blade air supply passages 27a, 27b are formed, respectively. Both main air supply paths 25a and 25b are
One end of each is open to the outside of the valve case 13, and the other end enters the motor case 3 via the main cylinder 14, passes through the peripheral wall of the inner cylinder 4, and communicates with the eccentric hollow hole 4a. Both auxiliary air supply passages 26
a, 26b branch from the upstream side of the main cylinder 14 of the main air supply passages 25a, 25b, which correspond to the forward and reverse directions, and merge into one common auxiliary air supply passage 26c via the pilot cylinder 15, It communicates with the cylinder cover 19 side of the main cylinder 14. Both blade air supply passages 27a, 27b are connected to the main cylinder 14 of each main air supply passage 25a, 25b and each auxiliary air supply passage 26a, 26b, respectively, with the forward and reverse directions corresponding to each other.
It branches into the motor case 3 from the middle part of the inner cylinder 4, passes through the peripheral wall of the inner cylinder 4 in the axial direction, enters the disc part 5a of the front end plate 5, and enters the disc part 5.
a pair of forward and reverse blade air supply grooves 2
It communicates with 7c and 27d. Both blade air supply grooves 27c and 27d are respectively formed on the inner surface of the disc portion 5a so as to face each other in an arc shape over the extrusion range of the blade 11, and communicate with the bottom of the slot 10a. 28 is a main exhaust path formed in the motor case 3, one end of which opens to the outside of the motor case 3, and the other end of which connects to the eccentric hollow hole 4a through a plurality of exhaust holes 29 passing through the peripheral wall of the inner cylinder 4. is connected to.
Note that 30 is an air vent hole bored in the cylinder cover 20.

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

The open ends of both main air supply paths 25a and 25b are connected to an air source via a switching valve (not shown).
To rotate the air motor section 1a in the forward direction, the switching valve connects the main air supply path 25a for forward rotation to an air source, and opens the main air supply path 25b for reverse rotation to the atmosphere. Compressed air is supplied from the air source to the main air supply path 25 for forward rotation.
a, and a part of it is first divided into the forward rotation blade air supply path 27a and the forward rotation auxiliary air supply path 26a. The compressed air branched into the forward rotation blade air supply path 27a reaches the forward rotation blade air supply groove 27c of the front end plate 5, flows from there into the bottom of the slot 10a located in the extrusion range, and pushes out the blade 11. The tip end surface of the extruded blade 11 abuts against the wall surface of the eccentric hollow hole 4a to maintain airtightness. On the other hand, the auxiliary air supply path 26 for forward rotation
The compressed air diverted into the pilot cylinder 15 flows into the pilot cylinder 15 to operate the pilot valve 17, and the forward rotation operation valve section 17b is connected to the forward rotation auxiliary air supply path 2.
6a is opened, and the reverse rotation operation valve portion 17c closes the reverse rotation auxiliary air supply path 26b (see FIG. 3).
The remaining air on the side of the reverse rotation operation valve portion 17c flows backward through the reverse rotation auxiliary air supply path 26b and the reverse rotation main air supply path 25b, and is discharged into the atmosphere. The compressed air that has activated the pilot valve 17 flows into the common auxiliary air supply passage 26c via the opened normal rotation auxiliary air supply passage 26a, and is then transferred from the cylinder cover 19 to the main cylinder 14.
It flows into the inside and acts on the piston portion 16b, and operates the main valve 16 against the compression spring 22. Each air supply valve part 16c, 16d of the main valve 16 simultaneously opens each main air supply path 25a, 25b, respectively.
The remaining air on the side of the reverse air supply valve portion 16d is discharged into the atmosphere from the air vent hole 30. Next, the remainder of the compressed air that has flowed into the main air supply path 25a for forward rotation flows into the main cylinder 14, and passes through the opened main air supply path 25a for forward rotation to the adjacent air in the eccentric hollow hole 4a. It is supplied into the forward rotation action chamber A formed between the blades 11 and rotates the rotor 7 in the forward direction. When the rotor 7 rotates approximately half a rotation, most of the compressed air in the normal rotation action chamber A is exhausted into the atmosphere from the main exhaust passage 28 via the exhaust hole 29, but the remaining air is released by the rotation of the rotor 7. The air then flows back into the opened main air supply path 25b for reverse rotation, passes through the main cylinder 14, and is discharged into the atmosphere from the open end side of the main air supply path 25b for reverse rotation. Note that, when the rotor 7 rotates and the bottom of the slot 10a communicates with the reversing blade air supply groove 27d, the compressed air that is in the slot 10a and is pushing out the blade 11 flows into the groove 27.
d into the reversing blade air supply path 27b,
The air is discharged into the atmosphere from the open end side of the main air supply path 25b for reverse rotation, so as not to prevent the blade 11 from being pushed into the slot 10a by the wall surface of the eccentric hollow hole 4a. In addition, in order to reversely rotate the air motor section 1a, the main air supply path 25b for reverse rotation is connected to the air source using the switching valve.
5b, and the main air supply path 25a for forward rotation is opened to the atmosphere. The supplied compressed air acts in the opposite manner to the case of forward rotation. That is, first, the compressed air divided into the reversing blade air supply path 27b flows into the bottom of the slot 10a from the reversing blade air supply groove 27d, and flows into the blade 11.
Push out. On the other hand, the compressed air branched into the reverse rotation auxiliary air supply path 26b operates the pilot valve 17 to open the reverse rotation auxiliary air supply path 26b and close the forward rotation auxiliary air supply path 26a. The compressed air that has activated the pilot valve 17 flows into the main cylinder 14 via the common auxiliary air supply path 26c, operates the main valve 16, and flows into both main air supply paths 2.
Open 5a and 25b at the same time. Next, the remainder of the compressed air supplied into the main air supply path 25b for reversal passes through the main cylinder 14 to the action chamber B for reversal formed between the adjacent blades 11 in the eccentric hollow hole 4a. The rotor 7 is rotated in the opposite direction.

In the above embodiment, the time from when the compressed air is divided into the blade air supply path 27a or 27b until the blade 11 is pushed out is such that the compressed air passes through the pilot valve 17 to the main valve 1.
6 and start the rotor 7. Therefore, before the rotor 7 starts, airtightness is maintained between the tip surface of the blade 11 and the wall surface of the eccentric hollow hole 4a. Therefore, the action chamber A
Or the compressed air supplied into the blade 11
There is no risk that the air motor part 1a will fail to start due to leakage from the tip surface of the air motor part 1a.

(Effects of the Invention) The present invention has a configuration in which the forward/reverse device is integrally provided with the air motor as described above, so the structure of the entire equipment and the air piping are simplified.
It has excellent advantages such as not only reducing weight but also reducing failures due to air leaks and the like.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view of a reversing device for an air motor showing an embodiment of the present invention, FIG. 2 is a cross-sectional view of the stairs taken along the line -- in FIG. 1, and FIG. 3 is a cross-sectional view taken along the line -- in FIG. 1... Forward and reverse air motor, 2... Forward and reverse rotation device section, 3... Motor case, 4a... Eccentric hollow hole,
7... Rotor, 11... Blade, 13... Valve case, 14... Main cylinder, 15... Pilot cylinder, 16... Main valve, 17
... Pilot valve, 22 ... Compression spring, 25
a... Main air supply path for forward rotation, 25b... Main air supply path for reverse rotation, 26a... Auxiliary air supply path for forward rotation, 26b... Auxiliary air supply path for reverse rotation.

Claims (1)

[Claims] 1. In an air motor in which a cylindrical rotor with a plurality of blades on its outer circumferential surface is rotatably supported in an eccentric hollow hole of a cylindrical motor case so as to be rotatable in both forward and reverse directions, there is a main motor inside. A valve case is fixed to the motor case, and includes a cylinder and a pilot cylinder, a pair of main air supply passages for forward rotation and reverse rotation, and a pair of auxiliary air supply passages for forward rotation and reverse rotation, respectively. One end of each main air supply passage opens to the outside of the valve case, and the other end communicates with the eccentric hollow hole via the main cylinder. The air supply path branches from the main cylinder upstream side, passes through the pilot cylinder, merges, and communicates with one end of the main cylinder, and there is a main valve inside the main cylinder that opens and closes both of the main air supply paths at the same time. A compression spring that presses the main valve is provided at the other end of the main cylinder, and a pilot valve that alternately opens and closes both of the auxiliary air supply passages is slidably inserted into the pilot cylinder. A forward and reverse air motor characterized by being inserted.