JPH0129991B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a compressed air pressure increasing device, in particular, which utilizes general factory pressure (4 to 5 kg/cm ² ) and uses an air actuator etc. to increase the pressure of compressed air using only air pressure. This invention relates to an all-air pressure booster that obtains air pressure.

The present invention will be described below with reference to one embodiment.

Figure 1 is a block diagram showing the overall configuration, where 1 indicates compressed air (for example, 4 kg/cm ² ).
2 is an air tank for accumulating pressurized compressed air, and 3 is equipped with a piston head 3a and a piston rod 3b, which further compresses the compressed air supplied from the intake port 1 and discharges it to the air tank 2. 4 is a second actuator having a piston head 4a and a piston rod 4b; 5 is a connecting means for connecting the piston rods 3a and 3b of the first and second actuators 3 and 4 so that they move together; 5a; 6 is an operating rod that protrudes from the connecting means and pushes a contactor of a limit valve to be described later; 6 switches and supplies compressed air supplied from the intake port 1 to the front and rear chambers of the piston head 4a of the second actuator 4; second actuator 4
piston rod 4b and the first piston rod 4b connected thereto.
7 is a 3-port 2-position switching valve that reciprocates the piston rod 3b of the actuator 3.
8 is a second limit valve with 3 ports and 2 positions, 7a and 8a are contacts of the first and second limit valves 7 and 8, respectively, and an operating rod protruding from the connecting means 5. When 5a reaches each position at either end of its reciprocating stroke, it is pushed by it and moves the spool of the first or second limit valve 7, 8 to switch its port position. 9 is the first throttle valve attached to the pipe following the intake port 1; 10 is the intake port 1;
a pressure regulating valve 11 with a pressure gauge that regulates the compressed air supplied from the compressed air to its set pressure and supplies it to the switching valve 6 and the first and second limit valves 7 and 8;
When the pressure inside the air tank 2 exceeds a certain pressure,
Safety valve with pressure gauge that releases air to atmosphere, 12
13 is a pressure switch that detects that the pressure in the air tank 2 has reached a constant pressure; 13 is the pressure switch in the air tank 2
The second throttle valves 14, 15, 16, and 17 provided in the compressed air supply piping from the compressed air supply pipe are check valves.

The operation in this configuration is as follows.

Compressed air at general factory pressure (4 to 5 kg/cm ² ) is supplied to the intake port 1 from a compressed air pipe or an air compressor. After passing through the first throttle valve 9, this compressed air is supplied to the front and rear chambers of the piston head 3a of the first actuator 3 via check valves 14 and 15. The flow direction of this supply is directed toward the front and rear chambers of the piston head 3a by the action of the check valves 14 and 15, and when the volume of the front and rear chambers of the piston head 3a increases as the piston head 3a moves, this supply will be carried out. Furthermore, the compressed air that has passed through the first throttle valve 9 is regulated to a constant pressure (for example, 4 kg/cm ² ) by the pressure regulating valve 10 and is then supplied to the switching valve 6 and the first and second limit valves 7 and 8. be done.

Here, the first and second limit valves 7 and 8 switch the port position of the switching valve 6 by the following function.

In the state shown in FIG. 1, i.e. in an intermediate position in which the coupling means 5 has not reached the end of its reciprocating stroke,
The operating rod 5a is the contact 7 of the limit valves 7 and 8.
a, 8a, the first and second limit valves 7, 8, by the action of their return springs, close the pressure regulating valve 1 as shown in the figure.
The compressed air supplied from 0 is not allowed to flow through.

Further, when the connecting means 5 reaches the end position of the reciprocating stroke, the operating rod 5a is moved to the first position at each end position.
or the contact 7a of the second limit valve 7, 8,
8a and pushes the spool of the first or second limit valve 7, 8 against the pressure of the return spring to switch the port position of the limit valve.

That is, each time the operating rod 5a reaches the end position of the reciprocating stroke, the first or second limit valve 7, 8 supplies compressed air from the pressure regulating valve 10 to one of both ends of the spool of the switching valve 6. to instantly switch the port position of the switching valve 6, and also to switch the operating rod 5.
a is separated from the contacts 7a and 8a, and the first and second
Even if the pressurized supply of compressed air from the limit valves 7 and 8 is stopped, the spool of the switching valve 6 maintains its switched position. In short, the first
The action of the second limit valves 7 and 8 is to switch the port position of the switching valve 6 by the compressed air pressure from the pressure regulating valve 10 every time the connecting means 5 reaches both ends of the reciprocating stroke.

Such first and second limit valves 7,
8, compressed air is alternately supplied to the front and rear chambers of the piston head 4a of the second actuator 4, and the compressed air in the chamber to which it is not supplied is supplied to the switching valve 6. Exhaust into the atmosphere through the exhaust port. Therefore, the piston head 4a and the piston rod 4b of the second actuator 4 are moved by the compressed air pressure in a direction corresponding to the port position of the switching valve 6. The piston rod 3 of the first actuator 3 is connected to this via a connecting means 5.
b and the piston head 3a, while increasing the pressure of compressed air in the front chamber or rear chamber of the first actuator 3, air is supplied to the air tank 2 from one of the check valves 16 and 17.
Discharge and supply inside.

The flow of compressed air within the first and second actuators 3 and 4 during the above operation will be explained in order from the state shown in FIG. 1.

First, when compressed air flows into the front chamber (chamber on the left side in the drawing) of the piston head 4a of the second actuator 4 via the switching valve 6, the piston rod 4b is moved to the right in the drawing by the compressed air pressure. The piston rod 3b and piston head 3a of the connected first actuator 3 also move in the same direction (to the right in the drawing). Then the piston head 4a
The compressed air in the rear chamber (right side in the drawing) of the first actuator 3 is increased in pressure and discharged into the air tank 2 through the check valve 16 . At this time, the volume of the front chamber (left side in the drawing) of the first actuator 3 increases, so the compressed air supplied from the first throttle valve 9 passes through the check valve 14 to the rear chamber at that pressure. filled with. Note that, at this time, the check valves 15 and 17 are closed depending on the magnitude relationship of the pressures.

After that, when the piston heads 3a, 4a and the piston rods 3b, 4b together with the connecting means 5 reach one end of the reciprocating stroke (the right end in the drawing), the operating rod 5a fixed to the connecting means 5 comes into contact with the second limit valve 8. By pushing and moving the child 8a, the limit valve 8 switches the port position of the switching valve 6 by the above-described operation. Therefore, compressed air is supplied from the switching valve 6 to the piston rear chamber (right side in the drawing) of the second actuator 4, and the piston heads 3a, 4a, piston rods 3b, 4b, and connecting means 5 are not shown in the drawing. Move to the left. And the rear chamber of the first actuator 3 (left side in the drawing)
The compressed air inside is discharged and supplied into the air tank 2 through the check valve 17 while being increased in pressure. When the piston heads 3a, 4a, piston rods 3b, 4b, and connecting means 5 reach the other end position of the reciprocating stroke (the left end in the drawing), the operating rod 5a presses against the contact 7a of the first limit valve 7. The port position of the switching valve 6 is switched in the same manner as described above. Thereafter, the same operation as described above is repeated to supply compressed air into the air tank 2 while increasing the pressure, thereby gradually increasing the air pressure inside the air tank. The compressed air thus increased in pressure and stored in the air tank 2 can be taken out and used via the second throttle valve 13.

The upper limit of the air pressure that can be stored in the air tank 2 with the above configuration is expressed by the following equation.

That is, the air pressure of the compressed air supplied from the pressure regulating valve 10 is P ₁ , the air pressure of the compressed air accumulated in the air tank 2 is P ₂ , and the first actuator 3
Let the cylinder cross-sectional areas of the front and rear chambers of the piston head of the actuator 4 be V _1a and V _1b , respectively, and the cylinder cross-sectional areas of the front and rear chambers of the piston head of the second actuator 4 be V _2a and V _2a , respectively, then P ₂ = P ₁ · V _1b + P ₁ · V _2b /V _1a or P ₂ = P ₁ · V _1a + P ₁ · V _2b /V _1b .

For the sake of simplicity, a specific example of the upper limit pressure P ₂ in this case is as follows: the cylinder cross-sectional areas of the first actuator 3 and the second actuator 4 are V _1a , V _1b V 2a , V 1b V _2a ,
When calculated assuming that V _2b is approximately equal, P ₂ is slightly less than twice P ₁ .

In the above configuration, when the air pressure in the air tank 2 reaches the upper limit pressure _P2 , the second actuator 4 is pushed against the piston head 3a and piston rod 3b of the first actuator 3 via the connecting means 5. Even if pressure is applied, the movement will stop as a result of the pressure being balanced. After this, the compressed air in the air tank 2 is taken out to the outside, and when the pressure is reduced, the above-mentioned operation is performed again while increasing the pressure of the compressed air.
The air is supplied into the air tank 2.

The air pressure of the compressed air accumulated in the air tank 2 can be adjusted by a pressure regulating valve 10.

Further, by appropriately setting the ratio of the cylinder diameters of the first actuator 3 and the second actuator 4, the pressure increase ratio P ₂ /P ₁ can be changed.

Note that specific examples of the arrangement of each component of the above embodiment are shown in FIGS. 2 to 4. The numerals in these drawings correspond to the numerals given to each component explained in FIG. 1, and indicate the same thing.

As explained above, according to the present invention, by simply supplying compressed air from the intake port, compressed air is accumulated in the air tank at a higher air pressure than the supplied compressed air pressure without using any other power source. can be done. Furthermore, if the accumulated compressed air is taken out as necessary, the air sequence automatically supplies compressed air into the air tank until the set pressure is reached. Therefore, even if a factory only has a compressed air generating device that produces a typical factory pressure of 4 to 5 kg/cm ² , by using the device of the present invention, it can generate compressed air at higher pressures, such as 7 kg/cm ² . It is possible to obtain compressed air such as

[Brief explanation of drawings]

Fig. 1 is a block diagram showing the configuration of an embodiment of the present invention, Figs. 2 to 4 show an apparatus embodying the same, Fig. 2 is a front view thereof, and Fig. 3 is a plan view thereof. Figure 4 is a sectional view of the right side thereof. 1... Intake port, 2... Air tank, 3... First actuator, 4... Second actuator, 3a, 4
a...Piston head, 3b, 4b...Piston rod, 5...Connecting means, 6...Switching valve.

Claims (1)

[Claims] 1. A compressed air intake, an air tank, a first actuator that further compresses the supplied compressed air using a piston mechanism and supplies the compressed air to the air tank, a second actuator that has a piston mechanism, and A connecting means for connecting the piston rods of the second actuator so that they move together; and a connecting means for switching and supplying the supplied compressed air to the front and rear chambers of the piston head of the second actuator, and connecting the connected first and second actuators. An all-air pressure booster characterized by comprising a switching valve that integrally reciprocates a piston mechanism.