FI82971C - Pneumatic valve and cylinder combination - Google Patents

Description

82971

PNEUMATIC VALVE AND CYLINDER COMBINATION-PNEUMATISK VENTIL- OCH CYLINDERKOMBINATION

The invention relates to an integrated pneumatic actuator in which both the self-working element, the cylinder and the piston and the means used to control the flow of the pressurized medium are space-savingly connected to the same actuator body.

A cylindrical valve member is known from GB publication No. 2,038,417, which is arranged inside the actuator and surrounds the shaft. The valve member acts like a spool valve, whereby the valve member, after a sufficiently long distance, opens the flow openings which it has closed on the sides of the cylinder.

The weakness of the solution according to the above publication is the required long movement of the valve member. Furthermore, the flow openings do not open or close quickly, because the end edges of the valve member have to pass the corresponding opening and thus travel a disproportionately long distance with respect to the general valve dimensioning even more than 10 mm. In addition, sealing the side flowing openings shown can be problematic.

The solution according to the invention provides a decisive improvement in the above-mentioned drawbacks. To achieve this, the device according to the invention is characterized by what is stated in the characterizing part of claim 1.

The main advantage of the invention can be considered to be the reaction rate applied to the air cylinder, since the working pressure acts all the time at the cylinder head / ends and thus no delay is caused by the pressure front, no additional protrusion due to the valves and the valves are not exposed to knocks. are built into the ends of the cylinder. The fast operation of the actuator is based on small travel distances and small moving masses in the closing and opening device.

2,82971

In the following, the invention will be explained in detail with reference to the accompanying drawings.

Figure 1 shows a pneumatic actuator.

Figure 2 shows the supply of compressed air and control pulse to a pneumatic actuator.

Figure 3 shows the control of the actuator by an electrical impulse.

Figure 4 shows the control of the actuator by the pressure pulse 11a.

Figure 5 shows the electrical control of the actuator valves. Figure 6 shows the control of the actuator with two pressure pulses.

Figure 7 shows a rotary actuator.

Figure 1 shows a pneumatic actuator comprising a cylinder part 1, under its control a movable piston rod 4 and a piston 2 provided with sealing rings 3,5 and 6, and cylindrical valve members 12 movable against a spring 11 and sealed by annular seals 9 and 10. 12 are annular end surfaces 50 which act as closing and opening surfaces. At its extreme positions, the movable valve member 12 collides with the end surface surfaces of the chambers 51,52,53,54. The actuator and its end pieces 7 and 8 are assembled by means of connecting screws 16 and 17.

In the absence of a pressure pulse, the impulse of either valve in the pressure chamber 18 is not affected by the pressure, the springs 11 pushing both valve members 12 to an extreme position, the chamber 13 is depressurized, the chamber 15 is pressurized and has also caused a pressure in the chamber 14 4 are in the retracted position and remain in question. position in the chamber 14 due to the applied pressure.

When the control pressure pulse is introduced, it is fed to both impulse pressure chambers 18, whereby the pressure pushes the valve members 12 against the springs 11 to another extreme position, preventing the pressure from acting on the chamber 15, releasing pressure from the chambers 15 and 14, the chamber 13 is blocked and the piston rod 4 and the piston 2 begin to be subjected to a pressure which pushes the piston rod 4 to the out position with the seals 5 acting as a retarder both at the beginning and at the end of the movement.

The piston rod remains in the out position as long as the pressure impulse acts in the chamber 18. When the control pressure pulse is removed the pushing springs 11 valve members 12 to the second extreme position, returning the piston 2 and piston rod 4 to the original position inside the piston rod shown in Figure 1. 5 act as a piston retarder at the beginning and end of the movement.

Figure 2a shows how the actuator is assembled with two tie screws 16 and 17 and the other two tie screws are replaced by pipes 20 and 21 along which the working pressure and pressure impulse can be passed from the actuator end 7 to the valve end 8.

Figure 2b shows the arrangement of the electric valve 22 giving a pressure pulse at the actuator end 7, the pressure pulse having the shortest possible distance to the valve to the actuator end 7 and along the pipe 20 or 21 to the valve end 8.

Fig. 3 schematically shows the control of an actuator by means of an electrical impulse, where an electrically operated valve gives a pressure impulse to the valve members 12 at the ends of the actuator. Fig. 1, where the valve members move against the springs 11, in the absence or termination of the pressure pulse

Fig. 4 schematically shows the control of the actuator by means of a pressure pulse (same as Fig. 1, but schematically).

Fig. 5 schematically shows the electric control of the actuator, in which the movement of the valve members 12 against the springs 11 is effected electromagnetically and the movement in the opposite direction takes place in the absence of an electrical impulse by the springs 11.

Fig. 6 schematically shows the control of the movement of the closing and opening member 12 by means of two pressure pulses.

Figure 7 shows an actuator provided with a control valve according to the present invention. A piston 36 with seals 35 and 37 movable in the cylinder 23 moves linearly under the control of a pin 32 attached to the cylindrical part 30. This pin 32 moves in the slide groove 31 of the piston 36. The arm 24 rotates when the pin 34 attached to the arm 24 slides in the second slide groove 33 in the piston 36 and the angular position of the arm 24 depends on the position of the piston 36 in the cylinder 23. The movement of the piston 36 is 10,11,12.

In particular, it should be noted that the actuator and valve arrangement according to the invention can be applied to all cylindrical-piston actuators operating with pressure media, both gases and liquids, as well as pressurized or gas engines with annular valves according to the invention or a valve controlled by a rotary shaft. pressure pulses or electrically. Otherwise, it should be noted that the invention has been described above with reference to only one preferred embodiment. However, this is in no way intended to limit the invention to this example only, but modifications are possible within the scope of the inventive idea defined by the following claims.

Claims (6)

1. With a pressure medium, the actuator operating which gives to a shaft (4), (24) a rotary or linear movement, in which the actuator is at least a valve which adjusts the movement of the actuator, placed into the actuator and the valve is formed by a cylindrical ring and moving flow channels opening and closing means (12) surrounding the said shaft and of annular seals (9), (10) characterized in that the annular end faces (50) of the moving cylindrical valve means (12) are in said the valve towards the surfaces (51,52,53,54) of the end walls (7.55), (8.55) of the chamber (13,15), operating closing and opening surfaces forming the annular valve openings against the end walls of said chambers. 2. A drive device according to claim 1, characterized in that a force effected by the pressure medium causes the movement of the cylindrical valve member (12,9,10) towards the end wall of the chamber (51,52,53,54). 3. A drive device according to claim 1, characterized in that a spring force causes the movement of the cylindrical valve member (12,9,10) to the end wall of the chamber (51,52 53,54). 4. A drive device according to claim 1, characterized in that an electric magnetic force causes the movement of the cylindrical valve member (12,9,10) to the end wall of the chamber (51,52,53,54). 5. A drive device according to any one of the preceding claims 1-4, characterized in that pressure medium and / or control pressure medium is passed from one end piece (7) of the drive device to the other end piece (8) through pipes (20, 21) which replace tie bolts (16 , 17).