KR101227685B1 - Pneumatic Motor of Reciprocating Type - Google Patents

Abstract

According to the present invention, the output of the pneumatic motor can be prevented when the operation is stopped due to the load and then restarted after releasing the load. Also, by using a small part and having a simple structure, the production cost can be reduced and the maintenance is easy, and the size can be reduced. The present invention relates to a reciprocating pneumatic motor.
The present invention provides a cylinder body having intake and exhaust holes; A valve unit disposed inside the cylinder body such that one side communicates with the intake hole and the other side communicates with the exhaust hole, and divides the cylinder body into two chambers; And a piston unit reciprocally installed in the cylinder body, wherein the piston unit reciprocates by compressed air alternately introduced and discharged into the two chambers through the valve unit.

Description

Reciprocating Pneumatic Motor {Pneumatic Motor of Reciprocating Type}

The present invention relates to a reciprocating pneumatic motor, and more particularly to a reciprocating pneumatic motor that can stop the operation due to the load and then reduce the output when the operation is reactivated after the load is released, and can implement a simple structure and miniaturization using fewer components will be.

In general, pneumatic motors are used to convert energy stored in the form of compressed air into kinetic energy. Such a pneumatic motor can be used in various applications including pumping liquid to a spray gun, or used in compressors or excavators used in earth anchor drilling and ground works for construction of various roads.

Such a pneumatic motor is classified into a rotary pneumatic motor disclosed in Korean Patent No. 317044 and a reciprocating pneumatic motor disclosed in Korean Unexamined Patent Publication No. 2009-0128466.

By the way, the conventional rotary pneumatic motor has a problem that the output is lowered even if the operation is resumed after the load is destroyed because the air is continuously discharged from the air chamber of the pneumatic motor when the load is applied.

In addition, the conventional reciprocating pneumatic motor has a complicated structure and uses a large number of parts, which increases manufacturing costs and is not easy to maintain. As the valve unit is disposed outside the cylinder body, the volume increases as a whole. To occupy the installation space, there was a difficult problem of handling such as transportation.

In order to solve the above problems, an object of the present invention is to provide a reciprocating pneumatic motor that can prevent the output of the pneumatic motor is reduced when the operation is stopped due to the load and restarting after the load is released.

Another object of the present invention is to provide a reciprocating pneumatic motor that can be reduced in size and easy to manufacture and easy to maintain, according to a simple structure using fewer parts.

Still another object of the present invention is to provide a reciprocating pneumatic motor capable of miniaturization and light weight by providing all the units in the cylinder body.

Another object of the present invention is to provide a reciprocating pneumatic motor that can reciprocate the piston unit by pneumatic pressure alone without using electricity or other control device for driving the motor.

In order to solve the above problems, the present invention is a cylinder body having intake and exhaust holes; A valve unit disposed inside the cylinder body such that one side communicates with the intake hole and the other side communicates with the exhaust hole, and divides the cylinder body into two chambers; And a piston unit reciprocally installed in the cylinder body, wherein the piston unit reciprocates by compressed air alternately introduced and discharged into the two chambers through the valve unit. Provide pneumatic motors.

The piston unit may include a left and a right piston for re-partitioning the chamber divided into two chambers by the valve unit, respectively, between the left piston and the valve unit, between the right piston and the valve unit, respectively. Left and right air chambers may be formed in communication with the valve unit.

An oil chamber in which oil is charged may be formed between the left piston and one end of the cylinder body and between the right piston and the other end of the cylinder body, respectively.

The valve unit may include an intake valve unit that alternately opens and closes the left and right air chambers to alternately introduce the compressed air flowing into the intake port into the left and right air chambers; And an exhaust valve unit configured to block communication with the exhaust port of the chamber into which compressed air is introduced, among the left and right air chambers.

The intake valve unit may include a check ball for closing the inlet of the chamber opposite to the chamber into which the compressed air is introduced while being pushed to the left or the right side by the compressed air flowing therein.

In this case, the intake valve unit may include left and right intake valves pressed by the left and right pistons to move the check ball to the opposite chamber, and the left and right intake valves may be arranged along an inner side of the intake valve unit. It is preferable to be arranged coaxially slidably.

Each of the left and right intake valves may communicate with one of the left and right air chambers, and the other may be opened and closed by the check ball.

The exhaust valve unit includes left and right exhaust valves that open and close the outlets of the left and right air chambers, and the left and right exhaust valves open the air chamber in which the other is in communication when the air chamber is closed. The compressed air that is opened and charged can be discharged to the exhaust port.

The left and right exhaust valves are disposed coaxially and may be connected to the guide shafts disposed between the left and right exhaust valves so as to be adjustable in intervals.

The left and right exhaust valves are elastically supported at opposite sides by a single coil spring at the same time, and when one of the pistons is pressed by the left and right pistons, the remaining pistons are supported by the pistons and guide shafts that are pressurized. The air chamber can be opened.

According to another feature of the invention, the invention the cylinder body having intake and exhaust holes located in the center; A valve unit disposed inside the center of the cylinder body such that one side communicates with the intake hole and the other side communicates with the exhaust hole, and divides the cylinder body into two chambers; And a piston provided with a left and right piston for repartitioning the chamber divided into two chambers by the valve unit into an air chamber and an oil chamber, respectively, and a piston shaft having a hollow portion communicating with the oil chamber. And a valve unit comprising: an intake valve unit configured to alternately open and close the left and right air chambers in order to alternately introduce compressed air flowing into the intake port into the left and right air chambers; And an exhaust valve unit configured to block communication with the exhaust port of a chamber into which compressed air is introduced, among the left and right air chambers, wherein the piston unit is alternately connected to the left and right air chambers through the valve unit. It provides a reciprocating pneumatic motor, characterized in that the reciprocating by the inlet and outlet compressed air.

As described above, in the present invention, the load applied to the motor or the device connected to the motor to receive the power is eliminated to prevent the air from being discharged from the air chamber even when the operation of the piston unit is stopped, so that the pneumatic motor is restarted. There is an advantage that can be prevented in advance to reduce the output of the.

In addition, since the present invention uses fewer parts and has a simple structure, it is easy to reduce manufacturing costs and maintain, as well as miniaturization and light weight, so that it is easy to move or handle as compared to the conventional medium-sized pneumatic motor. .

1 is a perspective view of a reciprocating pneumatic motor according to an embodiment of the present invention,
2 is a plan view showing a reciprocating pneumatic motor according to an embodiment of the present invention,
3 is a cross-sectional view taken along line III-III shown in FIG. 1;
4 to 10 are cross-sectional views sequentially showing the operation of the reciprocating pneumatic motor according to an embodiment of the present invention.

Hereinafter, with reference to the accompanying drawings will be described in detail the configuration of the reciprocating pneumatic motor according to an embodiment of the present invention.

 1 to 3, the reciprocating pneumatic motor 1 of this embodiment includes a cylinder body 10, a piston unit 30, and a valve unit 100. In addition, as shown in FIG. 3, the sealing portions P are disposed at the coupling portions of each component, thereby maintaining airtightness.

The cylinder body 10 is composed of a left cylinder (10a) and a right cylinder (10b) having the same diameter, each opposite side is detachably coupled to the left and right sides of the body 110 of the valve unit 100, respectively. At this time, the left and right cylinders (10a, 10b) and the body (110) are screwed to each other because the threads are processed to each other to be coupled to each other.

The left and right cylinders 10a and 10b are detachably coupled to the left and right covers 11 and 13 on opposite sides not coupled to the body 110, respectively. In this case, the threaded portions are formed at the engaging portions of the left cylinder 10a and the left cover 11, respectively, and are screwed together, and the right cylinder 10b and the right cover 13 are similarly formed with the threads at the engaging portions thereof. There are mutually screwed together.

Reference numeral B in FIGS. 1 and 2 is a bracket for stably supporting the cylinder body 10 to a peripheral drive device or other structure.

The piston unit 30 includes a piston shaft 31, a left piston 35 and a right piston 37.

The piston shaft 31 is slidably coupled to the left and right covers 11 and 13 and the body 110 of the valve unit 100, respectively.

In this case, the piston shaft 31 has a hollow portion 31a formed therein in the axial direction, and the hollow portion 31a is a passage through which oil charged into the left and right oil chambers C2 and C4 described later passes. Play a role. At this time, the left and right outer periphery of the piston 31 are formed with a plurality of communication holes 32a and 32b communicating the left and right oil chambers C2 and C4 and the hollow portion 31a, respectively.

In addition, caps 33a and 33b are fastened to both ends of the piston 31 to prevent leakage of oil charged in the hollow part 31a.

The left piston 35 is fixedly coupled to a part of the left side of the piston 31, the space between the left cover 11 and the body 110 of the valve unit 100 is the left air chamber (C1) and the left oil chamber ( Isolate each with C2).

In addition, a piston ring 35a is fastened to an outer circumference of the left piston 35, and the piston ring 35a has an inner circumferential surface of the left cylinder 10a when the left piston 35 reciprocates in the left cylinder 10a. Along sliding contact. In this case, the piston ring 35a isolates the left air chamber C1 and the left oil chamber C2 while keeping the airtight with each other to prevent oil and air from leaking into the chambers opposite to each other.

Like the left piston 35, the right piston 37 has a piston ring 37a fastened to its outer circumference, and the piston ring 37a has a right cylinder when the right piston 37 reciprocates in the right cylinder 10b. Sliding contact is made along the inner circumferential surface of 10b, and the right air chamber C3 and the right oil chamber C4 are isolated so as to be kept airtight with each other.

At this time, the left and right air chambers C1 and C3 are positioned between the body 110 and the left piston 35 and between the body 110 and the right piston 37 so as to communicate with the exhaust valve unit 150, respectively. As the 35 and 37 are reciprocated in the same direction at the same time, while expanding and contracting each other, the outside air is sucked in through the intake hole 110b of the body 110 and the air is discharged to the outside through the exhaust hole 110c.

The valve unit 100 includes a body 110, an intake valve unit 130, and an exhaust valve unit 150.

The body 110 is formed with a through hole 111 in which a piston shaft 31 is slidably coupled to a center thereof, and a packing ring for maintaining airtightness between the piston shaft 31 and the through hole 111. 112a and 112b are provided.

In addition, the coupling hole 113 in which the intake valve unit 130 is fixedly installed is formed in one side of the body 110 in parallel with the piston shaft 31, and the exhaust valve unit 150 is fixedly installed at the other side of the center. The engaging hole 115 is formed to penetrate parallel to the piston shaft 31.

In addition, the body 110 has an outer circumference 110a having a curved surface of approximately the same height as the outer circumferences of the left and right cylinders 10a and 10b, and the intake hole 110b and the exhaust valve unit 150 communicating with the intake valve unit 130. ) And exhaust holes 110c communicating with each other are formed.

Both sides of the intake valve unit 130 communicate with the left and right air chambers C1 and C3, respectively, and the first bushing 131, the left intake valve 137, the right intake valve 138 and the check ball 139 Include.

The first bushing 131 has a space portion 132 of a predetermined length in which a part of the left and right intake valves 137 and 138 and the check ball 139 are movably installed. In addition, the first bushing 131 is formed with a guide passage 135a for guiding the air introduced into the intake hole 110b to the space 132.

The left intake valve 137 has a sliding portion 137d inserted into the space portion 132 to be slidably moved along the inner circumferential surface of the space portion 132. In this case, the sliding part 137d is prevented from being separated from the first bushing 131 by the locking step 133a formed in the space part 132.

In addition, the left intake valve 137 is formed with a through hole 137a for guiding air introduced into the space 132 to the first air chamber C1. At this time, the sliding portion 137d is formed with a recess 137b into which a part of the check ball 139 is inserted, and the through hole 137a is inserted into / detached from the recess 137b. ) Is opened and closed.

The right intake valve 138 is installed on the first bushing 131 so as to face the left intake valve 137, and the configuration is the same as that of the left intake valve 137. That is, the right intake valve 138 is provided with a sliding portion 138d inserted into the space portion 132 to be slidably moved along the inner circumferential surface of the space portion 132. In this case, the sliding part 138d is prevented from being separated from the first bushing 131 by the locking step 133b formed in the space part 132.

In addition, the right intake valve 138 has a through hole 138a for guiding air introduced into the space 132 to the second air chamber C3. At this time, the sliding portion 138d is formed with a groove 138b into which a part of the check ball 139 is inserted, and the through hole 138a is inserted into / detached from the groove 138b. ) Is opened and closed.

 The exhaust valve unit 150 includes a second bushing 151, a left exhaust valve 152, a right exhaust valve 153, and a guide shaft 157.

The second bushing 151 has a communication hole 151a of a predetermined length in which a part of the left and right exhaust valves 152 and 153 and a guide shaft 157 positioned between the left and right exhaust valves 152 and 153 are disposed together. In this case, the communication hole 151a of the second bushing 151 may discharge the air discharged from the first and second air chambers C1 and C2 to the outside of the reciprocating pneumatic motor 1. ).

The left exhaust valve 152 has a locking protrusion 152a formed along the outer periphery of the portion protruding to the outside of the communication hole 151a, and the portion inserted into the communication hole 151a is connected to the first adjustment screw 154. It is fastened to one side of the guide shaft 157 by. In this case, the locking protrusion 152a opens and closes the left inlet 151b of the communication hole 151.

 Furthermore, the left side exhaust valve 152 covers the first adjustment screw 154 and a fixing cap 152b is coupled to be withdrawn from the left side exhaust valve 152 when necessary.

Similar to the left exhaust valve 152, the right exhaust valve 153 has a locking protrusion 153a formed along the outer circumference of the portion protruding to the outside of the communication hole 151a, and the portion inserted into the communication hole 151a is The other adjustment screw 155 is fastened to the other side of the guide shaft 157. In this case, the locking protrusion 153a opens and closes the right inlet 151c of the communication hole 151.

Further, the right exhaust valve 153 covers the second adjustment screw 155 and a fixed cap 153b is coupled to be withdrawn from the right exhaust valve 153 when necessary.

In this case, the first and second adjustment screws 154 and 155 fix the left and right exhaust valves 152 and 153 to the guide shaft 157, and the left and right exhaust valves 152 and 153 adjust the play with the second bushing 151. Thereby varying the movable distance of the left and right exhaust valves 152 and 153. Accordingly, the left and right exhaust valves 152 and 153 controlled by the first and second adjustment screws 154 and 155 set a time point at which the check ball 139 closes the communication holes 137a and 138a of the left and right intake valves 137 and 138, respectively. The exhaust timing of the air discharged from the first and second air chambers C1 and C2 can be controlled.

In addition, the left and right exhaust valves 152 and 153 are elastically supported by the coil spring 159 surrounding the guide shaft 157. Furthermore, the communication holes 151a of the second bushing 151 are opened and closed alternately according to the pressure state of the first and second air chambers C1 and C3.

The operation of the reciprocating pneumatic motor 1 according to the embodiment of the present invention configured as described above will be described sequentially with reference to FIGS. 4 to 10.

Referring to FIG. 4, when compressed air flows into the inlet port 110b formed in the body 110 of the valve unit 100, the compressed air is first bushed through the guide passage 135a of the intake valve unit 130. It flows into the space part 132 of 131.

At this time, the check ball 139 is pushed to the left or the right by the compressed air flowing into the guide passage (135a) according to the position located on the right or left of the guide passage (135a) around the guide passage (135a). In the present embodiment, the check ball 139 will be described as being pushed to the right.

Referring to FIG. 5, the check ball 139 is pushed to the right by the compressed air introduced into the space 132, and is closed in the recess 138b of the right intake valve 138 to close the through hole 138a. The compressed air of the space 132 blocks the inflow of the second air chamber C3.

Accordingly, the compressed air continuously introduced into the space 132 flows into the first air chamber C1 through the through hole 137a of the left intake valve 137. As the compressed air is continuously introduced into the first air chamber C1, the left piston 35 is pushed toward the first cover 11 so that the first air chamber C1 is expanded. In this case, the left exhaust valve 152 is pushed to the right by the compressed air charged into the first air chamber C1 and closes the left inlet 151b of the second bushing 151 with the locking protrusion 152a. The compressed air in the air chamber C1 is blocked from being discharged through the exhaust valve unit 150.

At the same time, while the right piston 37 moves to the body 110 side, the second air chamber C2 is reduced and contacts one side 138c of the right exhaust valve 138.

Referring to FIG. 6, the right piston 37 continuously moves toward the body 110, pushing the right exhaust valve 138 to move the check ball 139 to the left intake valve 137. In this case, the right piston 37 contacts one side 153c of the right exhaust valve 153.

Referring to FIG. 7, the right piston 37 pushes the right exhaust valve 153 elastically supported by the coil spring 159 to the left to move the other side 153d of the right exhaust valve 153 to the guide shaft 157. In close contact with one side 157b, clearance between the right exhaust valve 153 and the guide shaft 157 is eliminated.

Referring to FIG. 8, the right piston 37 continuously pushes the right exhaust valve 153 elastically supported by the coil spring 159 to the left, and the other side 157a of the guide shaft 157 is the left valve 152. By close contact with the other side (152d) of the clearance between the left exhaust valve 152 and the guide shaft 157 is eliminated.

At the same time, the check ball 139 pushed to the left by the right intake valve 138 moves to the left of the guide passage 135a through the guide passage 135a.

Referring to FIG. 9, the left exhaust valve 152 is pushed to the left by the guide shaft 157 and the left inlet that is closed while the locking protrusion 152a is spaced apart from the left inlet 151b of the second bushing 151. 151b is in communication with the first air chamber C1.

Accordingly, the compressed air charged in the first air chamber C1 is discharged to the exhaust port 110c (see FIG. 2) through the communication hole 151a of the second bushing 151.

In addition, as the pressure of the first air chamber C1 decreases, the check ball 139 is pushed toward the left intake valve 137 to be seated in the recess 137b of the left intake valve 137, and the through hole 137a is closed. To close.

As a result, the compressed air flowing into the space portion 132 of the first bushing 131 through the guide passage 135a is disposed on the left side of the guide passage 135a while the check ball 139 closes the through hole 137a. Because it is located, it moves to the right intake valve (138) side.

Referring to FIG. 10, the compressed air continuously flows into the second air chamber C3 through the through hole 138a of the right intake valve 138, and the compressed air continuously flows into the second air chamber C3. By the right piston 37 is pushed toward the second cover 13 side, the second air chamber (C3) is expanded.

In this case, the right exhaust valve 153 is pushed to the left by the compressed air charged into the second air chamber C3 so that the locking projection 153a closes the right inlet 151c of the second bushing 151.

As the right piston 37 moves to the right, the left piston 35 moves toward the body 110, thereby reducing the first air chamber C1. At this time, the compressed air charged in the first air chamber C1 is discharged to the exhaust port 110c (see FIG. 2) through the communication hole 151a of the second bushing 151.

Subsequently, the left piston 35 pushes the first intake valve 137 to the right to move the check ball 139 to the left side of the guide passage 135a, and pushes the first exhaust valve 152 to the right to the second bushing. The left inlet 151b of 151 is closed.

The reciprocating pneumatic motor 1 according to an embodiment of the present invention provides power to a device connected to the reciprocating pneumatic motor 1 while repeatedly performing the above-described operation process.

Furthermore, the reciprocating pneumatic motor 1 of the present invention is loaded on the pneumatic motor 1 itself or connected to the pneumatic motor 1 when the load is applied to the device (not shown) to receive power of the piston unit 30 The reciprocating motion is stopped, but unlike the conventional rotary pneumatic motor, since the exhaust valves 152 and 153 on the air chamber side filled with air remain closed, there is no leakage of air from the air chambers C1 and C3 so that the load disappears. When the reciprocating motion of the piston unit 30 is resumed. Accordingly, it is possible to solve the problem that the output is lowered when the reciprocating pneumatic motor (1) is restarted.

In addition, the reciprocating pneumatic motor (1) of the present invention is made of a simple structure using a small number of parts, as well as easy to maintain and reduce the manufacturing cost, since the valve unit 100 is accommodated inside the cylinder body (10) Compared with the conventional rotary pneumatic motor, it can be miniaturized and thus easy to handle.

In the above-described embodiment, in order to reduce wear of the piston ring 35a when the left and right pistons 35 and 37 are reciprocated, oil is charged in the left and right oil chambers C2 and C4. It is also possible to use.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention.

10: cylinder body 10a: left cylinder
10b: right cylinder 11: first cover
13: second cover 30: piston unit
31: piston shaft 32a, 32b: communication hole
33a, 33b: Cap 35: Left piston
37: right piston 100: valve unit
110: body 113,115: coupling hole
130: intake valve unit 131: first bushing
132: space 133a: locking jaw
135a: guide passage 137: left intake valve
138: right intake valve 139: check ball
150: exhaust valve unit 151: second bushing
151b: left entrance 151c: right entrance
152: left side exhaust valve 152a, 153a: locking projection
153: right exhaust valve 154: first adjusting screw
155: second adjusting screw 157: guide shaft
159: coil spring B: bracket
C1, C3: Air chamber C2, C4: Oil chamber
P: Sealing

Claims (15)

A cylinder body having a left air chamber and a right air chamber therein and having intake holes and exhaust holes formed therein;
A piston shaft disposed on the cylinder body so as to be linearly reciprocated, a left piston fixed to the piston shaft and in close contact with an inner surface of the left air chamber, and a right piston fixed to the piston shaft and in close contact with an inner surface of the right air chamber. One piston unit; And
A valve unit fixed inside the cylinder body to alternately supply air to the left air chamber and the right air chamber to reciprocate the piston shaft;
The valve unit has a first bushing having a space portion fixed to the inner center of the cylinder body and communicating with the intake hole, and a left intake air having a through hole inserted in the space portion of the first bushing so as to be linearly movable and communicating with the left air chamber. A right intake valve having a valve, a through-hole inserted in the space portion of the first bushing so as to be linearly movable and communicating with the right air chamber, and a check disposed in the space portion to seal the left intake valve and the right intake valve alternately. An intake valve unit comprising a ball,
An exhaust valve unit installed in the body and connected to the exhaust hole to exhaust air in the left air chamber to the outside when the air pressure in the left air chamber is released, and exhausting air in the right air chamber to the outside when the air pressure in the right air chamber is released Reciprocating pneumatic motor included. delete delete The method of claim 1,
And an oil chamber in which oil is charged between the left piston and one end of the cylinder body and between the right piston and the other end of the cylinder body, respectively. The method of claim 1,
The exhaust valve unit has a second bushing fixed in the center of the cylinder body and having a communication hole communicating with the exhaust hole, and is arranged to be linearly movable in the second bushing to release air in the left air chamber when the air pressure in the left air chamber is released. A left exhaust valve for discharging to the outside; a right exhaust valve disposed in the second bushing so that air pressure in the right air chamber is released; and a right exhaust valve for discharging air in the right air chamber to the outside; Is supported by the left side exhaust valve and the other end is supported by the right side exhaust valve, the reciprocating pneumatic motor including a spring to provide elastic force in the opening direction of the left side exhaust valve and the right side exhaust valve. delete The method of claim 5,
The body of the first bushing and the second bushing is fixed to the center of the cylinder body, the body is reciprocating pneumatic motor, characterized in that the piston shaft is in close contact with the inner circumferential slide. The method of claim 1,
The left and right intake valves are reciprocating pneumatic motors, characterized in that arranged slidably along the inner side of the first bushing. The method of claim 1,
One end of the left and right intake valve is formed with a groove in which the check ball is in close contact, the outer circumferential surface of the reciprocating pneumatic motor is formed with a locking step for preventing the departure from the first bushing. delete The reciprocating pneumatic motor according to claim 5, wherein the left and right exhaust valves are disposed coaxially and connected to the guide shafts disposed between the left and right exhaust valves so as to adjust the spacing, respectively. The method of claim 5,
A guide shaft is disposed between the left exhaust valve and the right exhaust valve, and the spring is disposed on an outer circumferential surface of the guide shaft, and the coil spring is configured to support a surface in which the left exhaust valve and the right exhaust valve face each other. Reciprocating pneumatic motor.

delete delete delete

Images