JPH049445Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Field of Industrial Application) This invention relates to a booster device for pneumatic tools such as impact tools and nailing tools.

(Prior art) As a conventional technology, there is, for example, Japanese Patent Application Laid-open No. 168878/1983.

(Problems to be Solved by the Invention) Conventional pressure boosting devices of this type require a considerable amount of time to boost the pressure, leading to problems such as increased air consumption and generation of shock and noise.

An object of the present invention is to provide a pressure boosting device for a pneumatic tool that can solve the above-mentioned problems and improve pressure boosting efficiency.

(Means for Solving the Problems) The pressure boosting device for a pneumatic tool of the present invention is such that both ends of a piston inserted into a cylinder are sealed so as to be slidable in the axial direction within the circumferential wall of the cylinder. A pair of fitted pressure receiving plates are provided protrudingly, and a first air chamber and a second air chamber are respectively formed outside of the pressure receiving plates, each communicating with an air supply passage and an air supply passage. A third air chamber on the first air chamber side and a fourth air chamber on the second air chamber side are defined between the two pressure receiving plates; A ring-shaped movable ring that is slidable in the axial direction, is tightly fitted concentrically with the piston, and is pushed in the direction of movement by the piston is installed, and this movable ring is connected to the piston. The third air chamber and the fourth air chamber are formed so as to selectively communicate with an air supply path or an external pressure flow path when the piston is pushed by the first air chamber. The pressurized air is reciprocated by the combined pressure of the air pressure in the fourth air chamber and the air pressure in the fourth air chamber, and the combined pressure of the air pressure in the second air chamber and the air pressure in the third air chamber. The air is configured to be alternately sent into the air supply path from the first air chamber and the second air chamber.

(Function) A piston having pressure receiving plates at both ends is inserted into the interior, and a first air chamber and a second air chamber are formed outside the pressure receiving plates and communicate with the air supply passage and the air supply passage, respectively. When the piston moves toward the first air chamber side or the second air chamber side in a cylinder having a third air chamber and a fourth chamber defined between both pressure receiving plates, the air in the first air chamber Alternatively, the air in the second air chamber is compressed and pressurized air is sent from the first air chamber or the second air chamber to the air supply path. At this time, the fourth air chamber or the third air chamber is communicated with the air supply path, and the third air chamber or the fourth air chamber is communicated with the external pressure flow path. When the piston moves to the moving end, a ring-shaped movable ring that is tightly fitted into the circumferential wall of the cylinder so as to be able to slide in the axial direction is pushed by the piston in the direction of movement, thereby opening the third air chamber and the fourth air chamber. The communication state between the air chamber, the air supply path, and the external pressure flow path is switched, and both pressure receiving plates receive the combined pressurizing force of the air pressure in the first air chamber and the air pressure in the fourth air chamber, or the second The combined pressing force of the air pressure in the room and the air pressure in the third air chamber pushes the piston toward the second air chamber or the first air chamber, and the piston moves toward the second air chamber or the first air chamber. The reciprocating movement of the piston causes pressurized air to be alternately delivered from the first and second chambers to the air supply path.

(Example) Next, an example of the present invention will be described with reference to the drawings.

The booster S is attached to the pneumatic tool body A and connected to the compressor C via a conduit K in order to boost the air pressure of the primary air supplied from the compressor C while being fed to the pneumatic tool body A. has been done.

A cylinder chamber 1a having a circular cross section is formed in a cylinder 1 installed in the booster S, and a partition wall 1b having a shaft hole 2 extending through the center thereof protrudes near the center of the cylinder chamber 1a. Further, the front and rear walls 1c and 1d of the cylinder 1 have first air supply passages connected to the air supply passage P1 connected to the pipe K, respectively.
A supply port 3A and a second supply port 3B are respectively opened, and the inner ends of both supply ports 3A and 3B are respectively provided with flexible check valves 4A to allow air to flow unilaterally into the cylinder chamber 1a. , 4B, respectively, and the front and rear walls 1c, 1d are respectively connected to the air supply passage P2 for supplying pressurized air to the air tool A.
A supply port 5A and a second supply port 5B are respectively opened, and the outer ends of both supply ports 5A and 5B are flexible in order to unilaterally flow out the pressurized air in the cylinder chamber 1a into the air supply path P2. check valve 6A,
6B, each of which is closed so as to be able to be evacuated. Further, near the center of the peripheral wall portion 1e of the cylinder 1, on the left side of the partition wall 1b in the figure, there are a third inlet port 3C connected to the air supply path P1 and an exhaust port 8 connected to the external pressure flow path P0. Further, the peripheral wall portion 1e has a first communication port 9 disposed at an intermediate position between the third inlet port 3c and the exhaust port 8, and a second communication port disposed on the right side of the partition wall 1b in the drawing. The first and second communication ports 9 and 10 communicate with each other through a communication path 11.

The shaft portion 12a of the piston 12 fitted in the cylinder 1 is slidable in the axial direction into the shaft hole 2 of the partition wall 1b in a tight-fitting manner, and the front and rear ends of this shaft portion 12a are each stepped. A first pressure receiving plate 13A and a second pressure receiving plate 13B are formed in a disc shape and are tightly fitted into the cylinder chamber 1a so as to be able to slide in the axial direction, and the first pressure receiving plate 13B is provided in the cylinder chamber 1a. The first one formed on the left side of 13A in the figure.
An air chamber 14 and a second air chamber 15 formed on the right side of the second pressure receiving plate 13B are provided together, and a partition wall 1b and a first pressure receiving plate are provided between both pressure receiving plates 13A and 13B in the cylinder chamber 1a. 13A, the third air chamber 16 formed between the partition wall 1b and the second pressure receiving plate 13B
A fourth air chamber 17 formed between the piston 12 and the piston 12 is also provided, and a stepped portion 18 is formed near the center of the shaft portion 12A of the piston 12.

The movable valve 19 formed in a substantially ring shape loosely fits the shaft portion 12a of the piston 12 in the third air chamber 16, and is tightly fitted so as to be slidable in the axial direction into the cylinder chamber 1a. Near the center, there is a cross section of approximately A mold-shaped communication groove 19a is recessed in a circumferential manner, and the left end of the inner circumferential surface of the groove 19a contacts the stepped portion 18 of the piston 12 when the piston 12 moves to the left, so that the movable valve 19 is moved to the left by the stepped portion 18. An interlocking piece 19b is formed to press the movable valve 19 to the right and to push the movable valve 19 to the right by the first pressure plate 13A by contacting the lower part of the first pressure plate 13A when the piston 12 moves to the right. It is installed protrudingly.

The shapes of the piston 12 and the movable valve 19 are such that the piston 12 moves to the right moving end, the movable valve 19 comes into close contact with the partition wall 1b, and the first pressure receiving plate 13A
When the lower part of the cylinder 1 comes into close contact with the movable valve 19, the outer surface of the second pressure receiving plate 13B and the rear wall part 2 of the cylinder 1
1d and the inner wall surface, and the first pressure receiving plate 13A
The second air chamber 1 is opened with a slight gap formed between the inner surface of the movable valve 19 and the left end surface of the movable valve 19.
5 and the third air chamber 16 are respectively reduced to their minimum volumes, and on the other hand, when the piston 12 moves to the left moving end and the lower part of the second pressure receiving plate 13B comes into close contact with the partition wall 1b, the first pressure receiving plate 13A The first air chamber is formed with a slight gap formed between the outer surface of the cylinder 1 and the inner wall surface of the front wall portion 1c of the cylinder 1, and between the inner surface of the second pressure receiving plate 13B and the partition wall 1b. 14 and the fourth air chamber 17 are each set to be reduced to the minimum volume, and when the piston 12 moves to the right moving end and the movable valve 19 is in close contact with the partition wall 1b, the exhaust port 8 and the first The communication port 9 is communicated with the communication groove 19a, and the inside of the fourth air chamber 17 is communicated with the external pressure passage P0 via the communication passage 11, while the piston moves to the left moving end and the piston 12
When the movable valve 19 pushed by the stepped portion 18 is displaced to the left moving end, the third supply port 3C and the first communication port 9 are communicated via the communication groove 19a, and the fourth air chamber 17 becomes a communication path. 11, it is communicated with the air supply path P1.

Therefore, the piston 12 at the right moving end is connected to the first pressure receiving plate 1.
The air pressure in the third air chamber 16 is pressurized to 3A;
The combined pressurizing force with the air pressure in the second air chamber 15 pressurizing the second pressure receiving plate 13B pushes the first
The air in the air chamber 14 is compressed, and the first air chamber 14
The air inside is increased in pressure and sent into the air supply path P2 through the first supply outlet 5A, while the air pressure in the first air chamber 14 is increased as the piston 12 at the left moving end pressurizes the first pressure receiving plate 13A. The air in the second air chamber 15 is pressed to the right by the combined pressure of the air pressure in the fourth air chamber 17 that is pressurized to the second pressure receiving plate 13B, and the air in the second air chamber 15 is compressed. The air inside flows through the second supply port 5.
The air is sent out through B into the air supply path P2.

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

First, when the piston 12 moves to the right moving end and the movable valve 19 is displaced to the right (see FIG. 2A), the third air chamber 16 is communicated with the air supply path P1, and the third air chamber 16 Primary air flows into the interior, and the fourth air chamber 17 is communicated with the external pressure flow path P0 to become the external pressure. 16
The air pressure in the third air chamber 16 that is fed into the air and pressurized to the first pressure receiving plate 13A, and the air pressure that is fed into the second air chamber 15 from the air supply path P1 through the second air supply port 3B. Starts leftward movement with the combined air pressure with the air pressure in the second air chamber 15 pressurized to the second pressure receiving plate 13B,
While the piston 12 is moving to the left, the inside of the first air chamber 14 is compressed and the air pressurized inside the first air chamber 14 flows into the first air chamber 14.
The air is sent out from inside the air chamber 14 into the air supply path P2 (see FIG. 2B). Then, the movable valve 19 moves to the left during the left movement of the piston 12, and at the left movement end of the piston 12, the movable valve 19 is displaced to the left, and the third air chamber 16 is communicated with the outside air flow path P0, and the outside air pressure is Since the fourth air chamber 17 is communicated with the third inlet 3c via the communication passage 11 and primary air flows into the fourth air chamber 17 (see FIG. 2 C), the piston 12 moves to the left. Immediately after reaching the end, air supply path P1
The air pressure in the first air chamber 14 is fed into the first air chamber 14 through the first air supply port 3A and pressurized to the first pressure receiving plate 13A, and the
The fourth air chamber 17 is fed into the fourth air chamber 17 through the supply port 3c and pressurized to the second pressure receiving plate 13B.
During the right movement of the piston 12, the inside of the second air chamber 15 is compressed, and the air pressurized inside the second air chamber 15 is transferred to the second air chamber 15. The movable valve 19 is pushed by the first pressure receiving plate 13A and moves to the right during the rightward movement of the piston 12, and the movable valve 19 moves to the right at the rightward end of the piston 12. The valve 19 is displaced to the right and returns to the state shown in FIG. High-pressure air is alternately sent out into the air supply path P2 from the air supply path P2, and high-pressure air is constantly supplied to the pneumatic tool body A.

When the supplied air pressure reaches a constant pressure, the piston 12 stops, and when the air is consumed, the piston 12 stops.
2 is activated again. Therefore, the compression action is repeated twice for each reciprocation of the piston 12, and pressurized air can be delivered even during the return stroke, so that the cylinder chamber 1a
This has the effect of significantly improving the pressure raising efficiency by raising the pressure of the air inside in a short time, and reducing the amount of primary air consumed in order to supply the pressurized air to the pneumatic tool body A.

Furthermore, since the turning action of the piston 12 is performed instantaneously, the pressurized air can be sent out from the first air chamber 14 and the second air chamber 15 without permission to control periodic fluctuations in the supplied air pressure. This makes it possible to stabilize the supply state of pressurized air, and since the piston 12 operates to supply high-pressure air at any stroke, it is possible to control the occurrence of shock and noise due to pressurization. In addition, a movable valve that switches the direction of movement of the piston is arranged outside the bulkhead and is configured to be directly pushed by the piston, and the movable valve is formed in a ring shape and is installed concentrically with the piston. This makes it possible to simplify and downsize the structure of the valve mechanism and reduce the number of component parts, and also eliminates problems such as delayed response of the movable valve due to twisting, etc. It is possible to smooth the movement of the valve, increase the response speed of the movable valve, smooth and stabilize the reciprocating movement of the piston, improve the pressurization efficiency, and reduce air consumption.

Note that the booster S may be provided in the middle of a pipe line K that connects the pneumatic tool body A and the compressor C.

(Effects of the Invention) Since the present invention is configured as described above, it is possible to improve the boosting efficiency, shorten the time for boosting the air pressure, and stabilize the supply state of the boosted air.

In addition, a movable valve that switches the direction of movement of the piston is arranged outside the bulkhead and is configured to be directly pushed by the piston, and the movable valve is formed in a ring shape and is installed concentrically with the piston. This makes it possible to simplify and downsize the structure of the valve mechanism and reduce the number of component parts, and also eliminates problems such as delayed response of the movable valve due to twisting, etc. It is possible to smooth the movement of the valve, increase the response speed of the movable valve, smooth and stabilize the reciprocating movement of the piston, improve the pressurization efficiency, and reduce air consumption.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention, and FIG. 1 is a longitudinal cross-sectional view of a booster, FIG. is a side view of the pneumatic tool. 1...Cylinder, 12...Piston, 13A,
13B...Pressure board, 14...First air chamber, 15...
...Second air chamber, 16...Third air chamber, 17...Fourth air chamber, 19...Movable valve, _P0 ...External pressure flow path, P1...Air supply path, P2...Air supply Output, S...boosting device.

Claims (1)

[Scope of utility model registration request] A pair of pressure receiving plates protruding from both ends of the piston inserted into the cylinder are respectively fitted tightly into the circumferential wall of the cylinder so as to be able to slide in the axial direction. A first air chamber and a second air chamber are formed, respectively, which communicate with the air supply passage and the air supply passage, and a third air chamber on the first air chamber side is formed between the two pressure receiving plates, and a third air chamber is provided between the pressure receiving plates. A fourth air chamber on the second air chamber side is defined, and a space between the two pressure receiving plates is slidable in the axial direction within the peripheral wall and tightly fitted concentrically with the piston. A ring-shaped movable valve that is pushed in the moving direction is installed, and when the movable valve is pushed by the piston, the third air chamber and the fourth air chamber are filled with air. The piston is formed to selectively communicate with the supply passage or the external pressure passage, and the piston is connected to the first passage.
Pressure increases by reciprocating with the combined pressurizing force of the air pressure in the air chamber and the air pressure in the fourth air chamber, and the combined pressurizing force of the air pressure in the second air chamber and the air pressure in the third air chamber. A pressurizing device for a pneumatic tool, characterized in that air is alternately sent out from the first air chamber and the second air chamber into the air supply path.