JP2017150653A - Compressed air discharge device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a compressed air discharge device capable of enhancing an intermittent discharge operation characteristic of compressed air.SOLUTION: A compressed air discharge device 10 has a main valve 12 and an auxiliary valve 13. The main valve 12 is switched between a discharge position M2 of discharging compressed air to a discharge port B and a shutoff position M1 of shutting off the discharge. The auxiliary valve 13 is switched between an air supply position P2 of supplying compressed air to a pilot chamber 37 through a supply/discharge flow passage 71 to switch the main valve 12 to the discharge position M2, and an exhaust position P1 of discharging compressed air in the pilot chamber 37 to the outside. The auxiliary valve 13 is switched between the air supply position and the exhaust position, and thereby intermittently discharging compressed air from a discharge port.SELECTED DRAWING: Figure 4

Description

  The present invention relates to a compressed air discharge device that discharges compressed air supplied from an air supply source from a discharge port.

  Compressed air discharge devices are used to clean objects by blowing compressed air on objects such as workpieces and jigs, and to prevent charging of objects by blowing ionized air on objects. The The compressed air discharge device used for such an application is connected to or mounted on an air ejection tool such as an air gun provided with a compressed air ejection port. Compressed air discharge devices that are connected to or mounted on an air gun include a type that continuously blows compressed air and a type that blows indirectly, and either type is selected depending on the application.

  As a type of compressed air discharge device that intermittently blows compressed air onto an object, there is a type that discharges compressed air intermittently, that is, in a pulsed manner by opening and closing an electromagnetic valve provided in a supply pipe. is there. Thus, in the type using a solenoid valve, electric power needs to be supplied to the solenoid valve and a timer for setting the opening / closing time.

  An intermittent air discharge device is described in Patent Document 1, and an air ejection switching valve is described in Patent Document 2. Each of Patent Documents 1 and 2 can intermittently discharge compressed air to the injection port without using an electromagnetic valve.

International Publication No. 2014/080664 Japanese Patent Publication No.49-15195

  The intermittent air discharge device described in Patent Document 1 has a supply / discharge pilot chamber. When the main valve is switched to the discharge position by the pressure of the supply / discharge pilot chamber, the intermittent air discharge device is stored in the supply / discharge pilot chamber. The discharged air is discharged into the discharge flow path. Therefore, the amount of air discharged to the discharge flow path is set by the volume of the supply / discharge pilot chamber. For this reason, the flow rate of the air discharged by one intermittent air discharge device cannot be changed, and it is particularly difficult to increase the flow rate. When this intermittent air discharge device is mounted on the upstream side of the air gun, pilot air is discharged from the intermittent air discharge device and an exhaust sound is generated even when a trigger provided on the air gun, that is, a discharge operation switch is not operated. For this reason, this intermittent air discharge device must be mounted on the downstream side of the air gun, and there is a problem that the tip side of the air gun becomes heavy.

  On the other hand, the switching valve for air ejection described in Patent Document 2 has a mover that is arranged between two elastic valves to constitute a main valve, and compressed air from a compressed air pressure source is supplied to each elastic valve. Are always supplied to the main valve chamber and the recessed chamber outside the cylinder. The main valve chamber communicates with the air supply port. When the main valve chamber is opened by the main valve, air is discharged from the air supply port to the outside. In the auxiliary valve chamber communicating with the concave chamber by the exhaust hole, a movable child as an auxiliary valve is arranged, and when the air is discharged from the air supply port, the auxiliary valve is supplied from the air supply port through the bypass hole. Close the exhaust vent with air. The sub-valve is a two-port valve that switches the main valve between a discharge position and a discharge stop position by compressed air supplied from an air supply source, and discharges the compressed air from the exhaust port to the outside at the discharge stop position.

  As described above, in the air ejection switching valve in which compressed air is intermittently discharged from the air supply port by constantly supplying compressed air to both sides of the main valve, the pressure of the supplied compressed air, bypass Since it is affected by the air resistance of the road and the cross-sectional area of the vent hole, the intermittent discharge operation characteristics are not reliable and unstable. In addition, the air ejection switching valve needs to change the original pressure supplied from the air supply source in order to change the discharge cycle.

  The objective of this invention is providing the compressed air discharge apparatus which can improve the intermittent discharge operation characteristic of compressed air.

  The compressed air discharge device of the present invention is a compressed air discharge device that discharges compressed air supplied from an air supply source from a discharge port, and a discharge port that discharges compressed air from a supply port connected to the air supply source. Piston disposed in a pilot chamber to which compressed air is supplied to a discharge position for connecting the air supply port and the discharge port against a thrust force for pressing a blocking position for blocking communication with the port The output port and the input port against a thrust force urged to an air supply position that communicates the main port with the pilot chamber and the input port to which the compressed air is supplied. A sub-valve having a sub-valve piston disposed in a sub-valve pilot chamber that is supplied with compressed air that is urged to an exhaust position that cuts off communication and connects the output port and the exhaust port; Communicating with the sub-valve pilot chamber, communicating the main pilot flow path for supplying compressed air to the sub-valve pilot chamber when the main valve is in the discharge position, the pilot chamber and the output port; A supply / exhaust flow path for discharging air in the pilot chamber from the exhaust port when the sub-valve is in the exhaust position.

  The main valve is switched between a discharge position for discharging the primary compressed air from the air supply source to the discharge port and a blocking position for blocking discharge. The auxiliary valve that operates the main valve includes an output port that communicates with the piston of the main valve, an input port that is supplied with compressed air, and an exhaust port that communicates with the output port, and supplies compressed air to the pilot chamber. The air supply position for switching the main valve to the discharge position and the exhaust position for discharging the compressed air supplied to the pilot chamber to the outside are switched. The auxiliary valve has an auxiliary valve pilot chamber to which compressed air is supplied from the main pilot flow path when the main valve reaches the discharge position. The pilot chamber and the output port are communicated with each other through a supply / exhaust flow path, and when the sub valve is in the exhaust position, the air in the pilot chamber is discharged from the exhaust port.

  The main valve is switched to the discharge position when compressed air is supplied to the pilot chamber by the sub-valve, and is switched to the shut-off position when air in the pilot chamber is discharged, so that the compressed air is stably and reliably supplied from the discharge port. Discharged intermittently. Since an air ejection tool such as an air gun can be connected to the ejection port, the compressed air ejection device can be coupled to the front side of the air ejection tool, and the operability of the air ejection tool can be improved.

It is a front view which shows the compressed air discharge device which is one embodiment. It is an AA line expanded sectional view in FIG. It is the BB line expanded sectional view in FIG. FIG. 4 is a pneumatic circuit diagram of the compressed air discharge device shown in FIGS. 1 to 3. (A) is a discharge waveform diagram of compressed air in the intermittent discharge mode, and (B) is a discharge waveform diagram of compressed air in the continuous discharge mode. It is a pneumatic circuit diagram which shows the compressed air discharge device which is a modification. It is a pneumatic circuit diagram which shows the compressed air discharge device which is another modification.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. As shown in FIG. 1, the compressed air discharge device 10 includes a port block 11 having a substantially rectangular parallelepiped shape. The main valve 12 is mounted on the outer surface 11a of the port block 11, and the sub valve 13 is mounted on the outer surface 11b that is perpendicular to the outer surface 11a. As shown in FIG. 2, a bottomed supply port 14 is provided in the port block 11, the supply port 14 opens at one end face of the port block 11, and an air supply source 20 is not shown for supply piping or hose. It connects to the supply port 14 through the supply flow path which consists of. A bottomed discharge port 15 is provided in the port block 11, and the discharge port 15 opens at the other end face of the port block 11 and is coaxial with the supply port 14. The air gun G is connected to the discharge port 15, and the compressed air discharge device 10 is arranged on the upstream side of the air gun G, that is, on the near side.

  If the compressed air discharge device 10 is arranged on the front side of the air gun G in the compressed air passage piping, the operator can hold the air gun G, so that the compressed air to the object such as a workpiece or jig Can be easily performed.

  As shown in FIG. 3, the main valve 12 has a valve housing assembly 16 having a substantially rectangular parallelepiped shape. The valve housing assembly 16 includes a main body block 16a, a pilot block 16b attached to the one end face, and a pilot block 16c attached to the other end face of the main body block 16a. A large diameter hole 17 and a small diameter hole 18 are formed through the main body block 16a in the longitudinal direction, and the large diameter hole 17 and the small diameter hole 18 are coaxial. A receiving hole 19 having substantially the same diameter as the large diameter hole 17 is formed in the pilot block 16c. The small diameter hole 18 opens to one end face of the main body block 16a, and the large diameter hole 17 opens to the other end face of the main body block 16a. A sleeve 21 is fixed between the main body block 16 a and the pilot block 16 c, and the large-diameter hole 17 and the accommodation hole 19 are partitioned by the sleeve 21. A guide hole 22 having an inner diameter J1 is provided in the sleeve 21. A pilot hole 23 with a bottom is formed in the pilot block 16b, and an inner diameter J2 of the pilot hole 23 with a bottom is larger than an inner diameter J1 of the guide hole 22.

  The large diameter hole 17 communicates with the supply port 14 through the communication hole 24, and the small diameter hole 18 communicates with the discharge port 15 through the communication hole 25. As shown in FIG. 3, the main valve shaft 26 is mounted in the valve housing assembly 16 so as to reciprocate in the axial direction. The main valve shaft 26 has a shaft portion 28 provided with a valve body 27, and the valve body 27 abuts on a valve seat 29 provided on a radial boundary surface between the large diameter hole 17 and the small diameter hole 18. . The piston 31 is mounted in the pilot hole 23 so as to reciprocate in the axial direction, and the piston 31 is abutted against the end face of the shaft portion 28. A seal member 32 that contacts the inner peripheral surface of the pilot hole 23 is provided on the piston 31. A return piston 33 is provided on the shaft portion 28, and a seal member 34 that contacts the inner peripheral surface of the guide hole 22 is provided on the return piston 33. Further, a flange 35 is provided on the shaft portion 28, and a seal member 36 is provided on the flange 35.

  Thus, the piston 31 is provided at one end of the main valve shaft 26, the return piston 33 is provided at the other end, and the valve body 27 is provided at the central portion in the axial direction. The main valve shaft 26 is supported by a return piston 33 and a flange 35, and reciprocates in the valve housing assembly 16 in the axial direction. The pilot chamber 37 is defined by the piston 31 and the pilot hole 23, and the return pilot chamber 38 is defined by the return piston 33 and the accommodation hole 19. The return pilot chamber 38 is communicated with the communication hole 24 by a branch channel 39 formed in the valve housing assembly 16. Accordingly, the compressed air flowing into the supply port 14 from the air supply source 20 is always supplied to the return pilot chamber 38 via the communication hole 24. Although the piston 31 is abutted against the shaft portion 28, the piston 31 may be fixed to the shaft portion 28 with a screw member or the like.

  3 corresponds to the air supply port A of the main valve 12 shown in FIG. 4, and the portion between the seal member 36 and the valve body 27 in the small diameter hole 18 shown in FIG. 3 is shown in FIG. This corresponds to the discharge port B of the valve 12. The supply port A communicates with the supply port 14 through the communication hole 24, and the discharge port B communicates with the discharge port 15 through the communication hole 25. The main valve shaft 26 is switched between a discharge position where the valve element 27 is separated from the valve seat 29 and a shut-off position where the valve element 27 contacts the valve seat 29. When the main valve shaft 26 reaches the discharge position, the air supply port A and the discharge port B communicate with each other, and the primary compressed air from the air supply source 20 is discharged to the discharge port 15. On the other hand, when the main valve shaft 26 is in the blocking position, the communication between the air supply port A and the discharge port B is blocked, and the discharge of compressed air from the discharge port 15 is stopped.

  The diameter of the piston 31 is larger than the diameter of the return piston 33. Therefore, when compressed air having substantially the same pressure is supplied to the pilot chamber 37 and the return pilot chamber 38, the thrust in the direction of separating the valve element 27 from the valve seat 29 blocks the thrust in the reverse direction, that is, the main valve shaft 26. It becomes larger than the thrust urging toward the position. Thus, the valve body 27 is separated from the valve seat 29 and the main valve shaft 26 is switched to the discharge position. On the other hand, when the compressed air is discharged from the pilot chamber 37 under the condition that the compressed air is supplied to the return pilot chamber 38, the valve element 27 contacts the valve seat 29 by the thrust of the compressed air applied to the return piston 33. The main valve shaft 26 is switched to the shut-off position. Thus, the pilot chamber 37 is a pilot chamber for discharge operation, and the return pilot chamber 38 is a pilot chamber for discharge stop operation.

  As described above, the return pilot chamber 38 is always in communication with the supply port 14 via the branch flow path 39, the large diameter hole 17, and the communication hole 24, so that compressed air is always supplied to the return pilot chamber 38. The main valve shaft 26 is constantly applied with a thrust in the return direction toward the shut-off position. Accordingly, by supplying compressed air to the pilot chamber 37, the valve element 27 is separated from the valve seat 29, and the main valve shaft 26 is switched to the discharge position. On the other hand, when the compressed air from the pilot chamber 37 is discharged, the valve element 27 comes into contact with the valve seat 29 and the communication between the air supply port A and the discharge port B is blocked.

  In the main valve 12 shown in FIG. 3, compressed air is always supplied to the return pilot chamber 38 as a return mechanism that urges the main valve shaft 26 to thrust in the return direction toward the shut-off position. Alternatively, a compression coil spring may be provided in the return pilot chamber 38 to apply a return direction thrust toward the valve seat 29 to the main valve shaft 26.

  As shown in FIG. 2, the auxiliary valve 13 includes a valve housing assembly 41 having a substantially rectangular parallelepiped shape. The valve housing assembly 41 includes a main body block 41a, a pilot block 41b attached to the one end face, and a pilot block 41c attached to the other end face of the main body block 41a. A valve hole 42 is formed in the main body block 41a, and the valve hole 42 penetrates the main body block 41a in the longitudinal direction. The input port C, the output port D, and the exhaust port E are respectively formed in the main body block 41 a so as to communicate with the valve hole 42, and each port opens toward the outer surface 11 b of the port block 11. The outer surface 11b of the port block 11 functions as an attachment surface to which the auxiliary valve 13 is attached. The output port D is provided in the central portion of the main body block 41a in the axial direction, the input port C and the exhaust port E are disposed on both sides of the output port D in the axial direction, and the auxiliary valve 13 is a three-port valve.

  A pilot valve shaft 43 is mounted in the valve hole 42 so as to reciprocate in the axial direction. The pilot valve shaft 43 includes a shaft portion 45 and four pilot valve bodies 44, and sliding portions 46 a and 46 b are provided at both ends of the shaft portion 45. The sliding portions 46a and 46b are guided by the inner peripheral surface of the valve hole 42, and the shaft portion 45 reciprocates in the axial direction. The pilot valve shaft 43 has an air supply position where the input port C and the output port D communicate with each other, and an exhaust position where the communication between the input port C and the output port D is blocked and the output port D communicates with the exhaust port E. Switch to either. When the pilot valve shaft 43 is in the exhaust position, the seal member 47b provided in the pilot valve body 44 comes into contact with the valve seat 51 between the input port C and the output port D as shown in FIG. The seal member 47 a provided on the body 44 is separated from the valve seat 52 between the output port D and the exhaust port E. On the other hand, when the pilot valve shaft 43 is in the air supply position, the seal member 47 a comes into contact with the valve seat 52 between the output port D and the exhaust port E, and the seal member 47 b is separated from the valve seat 51.

  A pilot hole 53 with a bottom is formed in the pilot block 41c, and the inner diameter of the pilot hole 53 is K1. On the other hand, a pilot hole 54 with a bottom is formed in the pilot block 41b, and the inner diameter K2 of the pilot hole 54 is larger than the inner diameter K1 of the pilot hole 53. The sub valve piston 55 is slidably mounted in the pilot hole 54 in the axial direction, and the sub valve piston 55 is abutted against one end surface of the pilot valve shaft 43. The auxiliary valve return piston 56 is mounted in the pilot hole 53 so as to be slidable in the axial direction, and the auxiliary valve return piston 56 is abutted against the other end surface of the pilot valve shaft 43. The seal member 57 a is provided on the outer peripheral portion of the sub valve piston 55, and the seal member 57 b is provided on the outer peripheral portion of the sub valve return piston 56.

  The secondary valve pilot chamber 58 is defined by the secondary valve piston 55 and the pilot hole 54, and the secondary valve return pilot chamber 59 is defined by the secondary valve return piston 56 and the pilot hole 53. The auxiliary valve pilot chamber 58 urges the pilot valve shaft 43 to thrust in the direction toward the exhaust position. On the other hand, the auxiliary valve return pilot chamber 59 urges the pilot valve shaft 43 to thrust in the direction toward the air supply position. The diameter of the auxiliary valve piston 55 is larger than the diameter of the auxiliary valve return piston 56. Therefore, when compressed air having substantially the same pressure is supplied to the auxiliary valve pilot chamber 58 and the auxiliary valve return pilot chamber 59, the thrust applied to the auxiliary valve piston 55 is superior to the thrust applied to the auxiliary valve return piston 56. The pilot valve shaft 43 is biased to the exhaust position against the thrust force biased to the air supply position, and the pilot valve body 44 is brought into contact with the valve seat 51. Thereby, the pilot valve shaft 43 is switched to the exhaust position. On the other hand, when compressed air is discharged from the sub-valve pilot chamber 58 with the compressed air supplied to the sub-valve return pilot chamber 59, the pilot valve is driven by the thrust in the return direction applied to the sub-valve return piston 56. The body 44 contacts the valve seat 52, and the pilot valve shaft 43 is switched to the air supply position.

  Since the auxiliary valve return pilot chamber 59 is always in communication with the supply port 14 as will be described later, thrust is always applied to the auxiliary valve return piston 56, and the pilot valve shaft 43 returns to the supply position. Directional thrust is always applied. Accordingly, when compressed air is supplied to the auxiliary valve pilot chamber 58, the pilot valve shaft 43 is positioned at the exhaust position. When the compressed air in the auxiliary valve pilot chamber 58 is exhausted, the pilot valve shaft 43 is positioned at the supply position.

  In the auxiliary valve 13 shown in FIG. 2, compressed air is always supplied to the auxiliary valve return pilot chamber 59 as a return mechanism that urges the pilot valve shaft 43 to thrust in the return direction toward the air supply position. However, instead of this, a compression coil spring may be provided in the auxiliary valve return pilot chamber 59 to always apply a thrust toward the air supply position to the pilot valve shaft 43.

  An air supply channel 61 is provided between the supply port 14 and the input port C, and compressed air supplied from the air supply source 20 is supplied to the input port C. The communication hole 24 communicating with the supply port 14 and the air supply channel 61 communicate with each other through a channel (not shown). As shown in FIG. 3, a throttle hole 61a is formed in the main body block 16a, and the throttle hole 61a communicates with a throttle valve mounting hole 61b having a larger diameter. The throttle valve mounting hole 61 b communicates with a communication hole 61 c extending from the main body block 16 a to the port block 11. The communication hole 61c communicates with an air supply hole 61d that opens to the outer surface 11b, and the air supply hole 61d communicates with the input port C. As described above, the air supply passage 61 is formed by the throttle hole 61a, the throttle valve mounting hole 61b, the communication hole 61c, and the air supply hole 61d.

  As shown in FIG. 3, a supply throttle 62 composed of a variable throttle valve is attached to the valve housing assembly 16. The air supply throttle 62 includes a valve case 63 attached to the throttle valve attachment hole 61 b and a screw shaft 64 screwed to the valve case 63, and the needle shaft 65 inserted into the throttle hole 61 a is the screw shaft 64. It is provided at the tip. An operation knob 66 is provided at the base end portion of the screw shaft 64, and a lock nut 67 is provided at the screw shaft 64. When the screw shaft 64 is rotated by the operation knob 66, the needle shaft 65 moves in the axial direction while rotating, and the clearance between the throttle hole 61a and the needle shaft 65, that is, the throttle amount is adjusted. When the lock nut 67 is fastened to the valve case 63, the screw shaft 64 is fixed. The air supply throttle 62 adjusts the flow rate of the compressed air flowing from the input port C to the output port D when the sub valve 13 is in the air supply position. The time until the main valve 12 is switched from the shut-off position to the air supply position is set by the air supply throttle 62.

  A supply / discharge channel 71 is provided between the output port D and the pilot chamber 37, and the output port D communicates with the pilot chamber 37 through the supply / discharge channel 71. As shown in FIG. 2, a supply / discharge hole 71 a is opened in the outer surface 11 b and formed in the port block 11, and as shown in FIG. 3, a supply / discharge hole 71 b is formed in the valve housing assembly 16 of the main valve 12. The supply / discharge hole 71b communicates with the pilot chamber 37. Both supply / discharge holes 71a and 71b communicate with each other through a communication hole 71c formed in the port block 11 and the main body block 16a. In this way, the supply / discharge channel 71 is formed by the supply / discharge hole 71a, the supply / discharge hole 71b, and the communication hole 71c. Therefore, when the auxiliary valve 13 is in the supply position, the primary air from the air supply source 20 is supplied to the pilot chamber 37.

  A main pilot flow path 72 is provided between the discharge port 15 and the auxiliary valve pilot chamber 58. When the main valve shaft 26 reaches the discharge position and compressed air is discharged from the discharge port 15, the main pilot flow path 72 supplies the compressed air to the sub valve piston 55. A pilot hole 72 a that opens to the outer surface 11 b is formed in the port block 11, and the pilot hole 72 a communicates with the discharge port 15 through the communication hole 25. A pilot hole 72 b communicating with the pilot hole 72 a is formed in the valve housing assembly 41 of the sub valve 13. The pilot hole 72 b opens into the auxiliary valve pilot chamber 58. Thus, the main pilot flow path 72 is formed by the pilot hole 72a and the pilot hole 72b.

  A sub pilot flow path 73 is provided between the supply port 14 and the sub valve return pilot chamber 59. The auxiliary pilot flow path 73 supplies the compressed air supplied from the air supply source 20 to the auxiliary valve return piston 56. A pilot hole 73 a that opens in the outer surface 11 b is formed in the port block 11, and the pilot hole 73 a communicates with the supply port 14. A pilot hole 73 b communicating with the pilot hole 73 a is formed in the valve housing assembly 41. The pilot hole 73 b opens to the auxiliary valve return pilot chamber 59. Thus, the sub pilot flow path 73 is formed by the pilot hole 73a and the pilot hole 73b.

  The exhaust port E communicates with the outside of the port block 11 by an exhaust passage 74 formed in the port block 11. An exhaust hole 74 a that communicates with the exhaust port E opens in the outer surface 11 b and is formed in the port block 11, and an exhaust hole 74 b that communicates with the exhaust hole 74 a opens in the outer surface 11 c of the port block 11. The outer surface 11c where the exhaust hole 74b opens is a surface opposite to the outer surface 11a as shown in FIG. 1, and is exposed to the outside. An exhaust throttle hole having an inner diameter smaller than that of the exhaust hole 74 a is provided in the exhaust hole 74 b as the exhaust throttle 75. The amount of exhaust air throttle by the exhaust throttle 75 is constant, and the exhaust throttle 75 is a fixed throttle. The exhaust throttle 75 sets a time until the compressed air in the pilot chamber 37 is discharged to the outside. However, the exhaust throttle 75 is not limited to a fixed throttle, and may be a variable throttle.

  FIG. 4 is a pneumatic circuit diagram of the compressed air discharge device 10 shown in FIGS. A supply flow path 76 is connected to the supply port 14, and compressed air is supplied from the air supply source 20 to the air supply port A of the main valve 12 through the supply flow path 76. The air supply source 20 includes a compressor that generates compressed air, an accumulator that stores the compressed air, a pressure regulating valve that adjusts the pressure of the compressed air supplied to the supply flow path 76, that is, the primary side air, and the like. The compressed air supplied to the port 14 is set to an arbitrary pressure.

  A mode switching valve 77 is provided between the exhaust passage 74 and the atmosphere opening, and the exhaust passage 74 is opened and closed by the mode switching valve 77. Although not shown in FIGS. 2 and 3, the mode switching valve 77 is provided downstream of the exhaust throttle 75 in the exhaust passage 74. The mode switching valve 77 is manually operated by an operator and is switched between a discharge state in which compressed air is discharged from the exhaust passage 74 to the outside and a stop state in which discharge is stopped. As will be described later, when the mode switching valve 77 is switched to an open state in which compressed air is discharged from the exhaust passage 74, the compressed air discharge device 10 is set to the intermittent discharge mode, and the exhaust passage 74 is closed and discharged. When stopped, the compressed air discharge device 10 is set to the continuous discharge mode.

  The compressed air discharge device 10 shown in FIG. 4 includes a mode switching valve 77 and can be switched between an intermittent discharge mode and a continuous discharge mode. However, in the form in which the mode switching valve 77 is not provided, the compressed air discharge device has only the intermittent discharge mode.

Next, a filling operation for filling compressed air into the apparatus when the compressed air discharge apparatus 10 is started up, an intermittent discharge mode, and a continuous discharge mode will be described. After the filling operation is completed, a state where the discharge operation of the compressed air by the discharge operation valve 81 is not performed is set as a standby state. The discharge operation valve 81 is, for example, a trigger switch for an air gun G. When the trigger switch 81 a shown in FIG. 4 is operated, compressed air is ejected from the ejection port 82.
[Filling operation]
(Filling operation in intermittent discharge mode)
In a state where the exhaust flow path 74 is opened by the mode switching valve 77 and the intermittent discharge mode is set, the compressed air discharge device 10 when the compressed air from the air supply source is supplied first, that is, the compressed air discharge device 10 is It operates as follows. It is assumed that the discharge operation valve 81 is closed as is normally done.

  As shown in FIG. 4, when compressed air is supplied from the air supply source 20 to the supply flow path 76, the compressed air is supplied to the return pilot chamber 38 of the main valve 12 via the branch flow path 39. Thereby, the main valve 12 is switched to the cutoff position M1. Further, the sub valve 13 is switched to the air supply position P <b> 2 by the compressed air supplied to the sub valve return pilot chamber 59 via the sub pilot flow path 73. Compressed air is supplied to the input port C of the auxiliary valve 13 through the air supply passage 61. Since the auxiliary valve 13 is switched to the air supply position P <b> 2, the compressed air flows from the input port C to the output port D and is supplied to the pilot chamber 37. When compressed air is supplied to the pilot chamber 37, the main valve 12 is switched to the discharge position M2. The time until switching from the blocking position M1 to the discharge position M2 is set by the throttle amount of the air supply throttle 62.

  When the main valve 12 is switched to the discharge position M2, the compressed air flows from the supply port A to the discharge port B. Since the discharge operation valve 81 is not operated and is at the stop position, the compressed air discharged to the discharge port B is supplied to the sub-valve pilot chamber 58 through the main pilot flow path 72. Thereby, the sub valve 13 is switched to the exhaust position P1, and the output port D communicates with the exhaust port E. When the sub valve 13 is switched to the exhaust position P1, the compressed air in the pilot chamber 37 is discharged to the outside from the exhaust flow path 74 via the output port D, the exhaust port E, and the mode switching valve 77. Then, the main valve 12 is returned to the cutoff position M1. The time until switching from the discharge position M2 to the cutoff position M1 is set by the throttle amount of the exhaust throttle 75.

  When the main valve 12 is returned to the cutoff position M1 in the initial state, the supply of primary air to the sub valve pilot chamber 58 of the sub valve 13 is stopped. However, since the discharge operation valve 81 is closed without being manually operated, the pressure in the sub-valve pilot chamber 58, the discharge flow path 78, and the main pilot flow path 72 does not decrease to the atmospheric pressure, but rather than the primary air pressure. Low compressed air remains in the auxiliary valve pilot chamber 58 and the like. If the thrust applied to the secondary valve return piston 56 by the pressure of the primary air is larger than the thrust applied to the secondary valve piston 55 by this residual pressure, the secondary valve 13 is switched to the supply position P2. Thus, the primary side air is supplied again to the auxiliary valve pilot chamber 58 after returning to the beginning.

  As described above, when the main valve 12 is switched to the shut-off position M1 and the discharge position M2 by the sub valve 13 a plurality of times, the residual pressure inside the sub valve pilot chamber 58 and the like is increased, and the sub valve 13 The position of the exhaust position P1 is held by the residual pressure in the flow path 72 and the auxiliary valve pilot chamber 58. As described above, in the state where the intermittent discharge mode is set, the auxiliary valve pilot chamber 58, the main pilot flow path 72, and the discharge flow path 78 are switched to the auxiliary valve pilot chamber 58, etc. A certain amount of compressed air is filled. When predetermined compressed air is filled in the auxiliary valve pilot chamber 58 and the like, the main valve 12 is in the shut-off position M1, and the auxiliary valve 13 is stopped in the filling completion state, which is the exhaust position P1. This filling operation is the same even in a mode in which the mode switching valve 77 is not provided.

(Filling operation in continuous discharge mode)
On the other hand, in a state in which the exhaust passage 74 is closed by the mode switching valve 77 and the continuous discharge mode is set, the compressed air discharge device 10 when the compressed air from the filling operation, that is, the compressed air from the air supply source is first supplied. The operation of is performed as follows. It is assumed that the discharge operation valve 81 is closed as is normally done.

  As shown in FIG. 4, when compressed air is supplied from the air supply source 20 to the supply flow path 76, the compressed air is compressed into the return pilot chamber 38 of the main valve 12 via the branch flow path 39 as in the intermittent discharge mode described above. Air is supplied. Thereby, the main valve 12 is switched to the cutoff position M1. Further, the sub valve 13 is switched to the air supply position P <b> 2 by the compressed air supplied to the sub valve return pilot chamber 59 via the sub pilot flow path 73. Compressed air is supplied to the input port C of the auxiliary valve 13 through the air supply passage 61. Since the auxiliary valve 13 is switched to the air supply position P <b> 2, the compressed air flows from the input port C to the output port D and is supplied to the pilot chamber 37. When compressed air is supplied to the pilot chamber 37, the main valve 12 is switched to the discharge position M2. The time until switching from the blocking position M1 to the discharge position M2 is set by the throttle amount of the air supply throttle 62.

  When the main valve 12 is switched to the discharge position M2, the compressed air flows from the supply port A to the discharge port B. Since the discharge operation valve 81 is not operated and is at the stop position, the compressed air discharged to the discharge port B is supplied to the sub-valve pilot chamber 58 through the main pilot flow path 72. As a result, the sub valve 13 is switched to the exhaust position P1, but the compressed air in the pilot chamber 37 is not discharged to the outside from the exhaust port E because the exhaust flow path 74 is closed by the mode switching valve 77. Therefore, the main valve 12 maintains the state of the discharge position M2, and the sub valve 13 maintains the state of the exhaust position P1.

As described above, in the state where the continuous discharge mode is set, when the primary side air is supplied from the air supply source 20 to the compressed air discharge device 10, the sub valve 13 is switched once to supply the compressed air to the inside of the device. The filling operation ends.
[Standby]
When the auxiliary valve 13 is in the state of holding the exhaust position P1 due to the residual pressure of the auxiliary valve pilot chamber 58 of the auxiliary valve 13 by the charging operation, the compressed air discharge device 10 enters a standby state. Thereby, the compressed air discharge apparatus 10 will be in the state which can eject compressed air with respect to a target object. When the intermittent discharge mode is set, the main valve 12 maintains the state where it is in the cutoff position M1. When the continuous discharge mode is set, the main valve 12 maintains the state where the discharge position M2 is reached.
[Intermittent discharge mode]
[1] The intermittent discharge mode is set by the discharge mode switching valve 77 of the compressed air, and when the push button 81a of the discharge operation valve 81 is operated in the standby state, the auxiliary valve pilot chamber 58 is discharged from the discharge passage 78. The residual pressure air is ejected from the ejection port 82 onto the object. When a predetermined amount of compressed air in the auxiliary valve pilot chamber 58 is ejected, the auxiliary valve 13 is switched from the exhaust position P1 to the air supply position P2 due to the pressure drop in the auxiliary valve pilot chamber 58. As a result, the primary air is supplied to the pilot chamber 37 of the main valve 12. When primary air is supplied to the pilot chamber 37, the main valve 12 is switched to the discharge position M2, and the air supply port A and the discharge port B of the main valve 12 communicate with each other. Thus, primary air from the air supply source 20 is discharged to the discharge port 15, and compressed air is discharged from the discharge port 82 of the discharge operation valve 81 through the discharge flow path 78.
[2] Discharge (ON) Time When the main valve 12 is switched to the discharge position M2, the primary side air is supplied to the secondary valve pilot chamber 58, and the secondary valve 13 is switched to the exhaust position P1. This is because the discharge flow path 78 has resistance to the air flow, so that the pressure in the auxiliary valve pilot chamber 58 located upstream increases. When switched to the exhaust position P1, the compressed air in the pilot chamber 37 is discharged to the atmosphere from the exhaust flow path 74 via the open mode switching valve 77, and the main valve 12 is switched to the cutoff position M1. The time during which the compressed air passes through the exhaust passage 74, that is, the discharge time, is set by an exhaust throttle 75 serving as a fixed throttle. Therefore, the time until the main valve 12 is switched from the discharge position M2 to the shut-off position M1, that is, the ON time during which the primary side air is ejected from the ejection port 82 of the discharge operation valve 81 is set by the opening of the exhaust throttle 75. The
[3] Discharge stop (OFF) time When the main valve 12 is switched to the shut-off position M1, the compressed air in the sub-valve pilot chamber 58 is ejected from the ejection port 82, and the pressure in the sub-valve pilot chamber 58 is reduced. The valve 13 is switched from the exhaust position P1 to the supply position P2. As a result, the primary air is supplied to the pilot chamber 37 via the air supply passage 61 and the supply / exhaust passage 71, and the main valve 12 is switched from the cutoff position M1 to the discharge position M2. At this time, the time during which the compressed air passes through the air supply passage 61 and is supplied to the pilot chamber 37, that is, the air supply time is set by the air supply throttle 62. Accordingly, the time until the main valve 12 is switched from the shut-off position M1 to the discharge position M2, that is, the OFF time during which the jet of compressed air is stopped from the jet outlet 82 is set by the air supply throttle 62.

  When the sub valve 13 is switched to the air supply position P2, the state returns to the compressed air discharge state of [1] described above. By repeating [1], [2], and [3], the primary air supplied from the air supply source 20 is intermittently, that is, turned on and off in a pulsed manner and discharged from the ejection port 82.

  As described above, when the sub-valve 13 that is a three-port valve is switched to the air supply position, the primary air is supplied to the pilot chamber 37 of the main valve 12 and the main valve 12 is switched to the discharge position. On the other hand, when the sub valve 13 is switched to the exhaust position, the air in the pilot chamber 37 of the main valve 12 is exhausted to the outside, and the main valve 12 is switched to the cutoff position. Accordingly, the main valve 12 is actuated by the compressed air supplied to the pilot chamber 37 via the sub valve 13, and the intermittent discharge operation can be performed stably and reliably, and the discharge operation characteristics can be improved.

FIG. 5A is a discharge waveform diagram of compressed air in the intermittent discharge mode. Under the state where the intermittent discharge mode is set by the mode switching valve 77, the compressed air is discharged from the discharge port 15 until the push button, that is, the trigger switch 81a is returned, while repeatedly discharging and stopping the discharge of the compressed air. . The discharge time T <b> 1 in FIG. 5A is set to a constant value according to the throttle amount of the exhaust throttle 75. On the other hand, the discharge stop time T <b> 2 can be changed by the supply air throttle 62.
[Continuous discharge mode]
When the continuous discharge mode is set by the mode switching valve 77 and the push button 81a of the discharge operation valve 81 is operated in the standby state, the residual pressure air in the auxiliary valve pilot chamber 58 is injected from the discharge flow path 78. The object is sprayed from the outlet 82. When a predetermined amount of compressed air in the sub-valve pilot chamber 58 is ejected, the sub-valve 13 is switched from the exhaust position P1 to the supply position P2 due to the pressure drop in the sub-valve pilot chamber 58, and the pilot chamber of the main valve 12 37 is supplied with primary air. When primary air is supplied to the pilot chamber 37, the main valve 12 is switched to the discharge position M2, and the air supply port A and the discharge port B of the main valve 12 communicate with each other. Thereby, primary air from the air supply source 20 is discharged to the discharge port 15, and compressed air is discharged from the discharge port 82 via the discharge flow path 78.

  When the main valve 12 is switched to the discharge position M2, the primary side air is supplied to the sub valve pilot chamber 58, and the sub valve 13 is switched to the exhaust position P1. Even when switched to the exhaust position P1, the exhaust flow path 74 is closed by the mode switching valve 77, so the compressed air in the pilot chamber 37 is not discharged to the outside. Therefore, the main valve 12 maintains the state of the discharge position M2, and the primary air is continuously ejected from the ejection port 82.

  FIG. 5B is a discharge waveform diagram of compressed air in the continuous discharge mode. Under the state where the mode switching valve 77 is set to the continuous discharge mode, the compressed air is continuously discharged from the discharge port 15. Continuous ejection is continued until the operation of the push button 81a is released.

  As described above, when the exhaust gas flow path 74 is closed by the mode switching valve 77 and the discharge from the pilot chamber 37 is stopped, the compressed air discharge device 10 enters the continuous discharge mode in which the compressed air is continuously discharged to the discharge port 15. Is set. In the state in which the continuous discharge mode is set, the sub valve 13 is fixed at the exhaust position P1, and the pilot chamber 37 is supplied with compressed air having the same pressure as that of the return pilot chamber 38. Since the diameter of the piston 31 in the pilot chamber 37 is larger than the diameter of the return piston 33 in the return pilot chamber 38, the thrust of the piston 31 is larger than the thrust of the return piston 33. Thereby, the main valve 12 maintains the state switched to the discharge position M2.

  On the other hand, when the exhaust passage 74 is opened by the mode switching valve 77, the compressed air discharge device 10 is set to an intermittent discharge mode in which compressed air is discharged to the discharge port 15 intermittently, that is, in pulses. In the state where the intermittent discharge mode is set, when the sub-valve 13 is switched to the air supply position P2, the pilot chamber 37 is supplied with compressed air having the same pressure as that of the return pilot chamber 38. As a result, the main valve 12 is switched to the discharge position M2, and compressed air is discharged from the discharge port 15. On the other hand, when the sub valve 13 is switched to the exhaust position P1, the compressed air in the pilot chamber 37 is discharged to the outside. Thereby, the main valve 12 is switched to the cutoff position M1, and the discharge of the compressed air from the discharge port 15 is stopped. The sub-valve 13 operates by alternately repeating the exhaust position P1 and the air supply position P2, whereby the compressed air is intermittently discharged to the discharge port 15. In this manner, the compressed air discharge device 10 is switched between the intermittent discharge mode and the continuous discharge mode by the mode switching valve 77.

  The mode switching valve 77 is attached to the outer surface 11c of the port block 11 directly or via piping. As shown in FIG. 2, in the form in which the exhaust throttle 75 is formed in the port block 11, the compressed air throttled by the exhaust throttle 75 passes through the exhaust passage 74 between the exhaust throttle 75 and the mode switching valve 77. To the mode switching valve 77. However, the mode switching valve 77 may be mounted in communication with the exhaust hole 74 b without providing the exhaust throttle 75 in the exhaust hole 74 b of the port block 11. An exhaust throttle 75 including a fixed throttle is provided in the path, the discharge port, or the exhaust flow path 74. As a form of the fixed throttle, a plurality of types of screw members or mode switching valves 77 having different inner diameters may be provided, and these members may be replaced so that the throttle amount can be changed in a plurality of stages.

  In the intermittent discharge mode, the time during which the compressed air is discharged from the discharge port 15, that is, the ON time, is set by the inner diameter of the exhaust throttle 75 serving as an exhaust throttle. On the other hand, the time during which discharge is stopped, that is, the OFF time, is set by the ventilation area between the throttle hole 61 a and the needle shaft 65. This ventilation area is adjusted steplessly by a variable throttle valve as the supply throttle 62.

  The discharge flow path 78 is connected to the discharge port 15, and the compressed air discharged from the discharge port B of the main valve 12 is discharged to the discharge flow path 78. A discharge operation valve 81 is provided in the discharge flow path 78. When the compressed air discharge device 10 is attached to the air gun G, the discharge operation valve 81 is a trigger switch for the air gun G. The discharge operation valve 81 is manually operated to an ejection position where the compressed air discharged from the discharge port B is ejected from the ejection port 82 and a stop position where the ejection is stopped. When the push button 81a of the discharge operation valve 81 is pushed in by the operator, the discharge operation valve 81 is switched to the ejection position. When the pushing operation is released, the discharge operation valve 81 is returned to the stop position by the spring force.

  FIG. 6 is a pneumatic circuit showing a compressed air discharge device 10a which is a modified example. In FIG. 6, members that are the same as those shown in FIG. 4 are given the same reference numerals.

  The main valve 12 of the compressed air discharge device 10 described above is a two-port valve having an air supply port A and a discharge port B, whereas the main valve 12a shown in FIG. A three-port valve having B and a communication port F. A supply flow path 76 is connected to the air supply port A, a discharge flow path 78 is connected to the discharge port B, and an air supply flow path 61 is connected to the communication port F. The main valve 12a is switched to either the cutoff position M1 or the discharge position M2 in the same manner as the main valve 12 described above. In the blocking position M1, the communication between the air supply port A and the discharge port B is blocked, and the air supply port A is connected to the communication port F. On the other hand, when switched to the discharge position M2, the air supply port A communicates with the discharge port B and the communication port F is blocked.

  In the compressed air discharge device 10 shown in FIG. 4, the primary side air from the air supply source 20 is constantly supplied to the input port C of the sub valve 13 through the air supply passage 61. On the other hand, in the compressed air discharge device 10a shown in FIG. 6, when the main valve 12a is at the shut-off position M1, the primary air is supplied to the input port C, and the main valve 12a is switched to the discharge position M2. Then, the communication between the air supply source 20 and the input port C is interrupted. When this communication is blocked, the primary air is supplied from the air supply port A of the main valve 12a to the sub valve pilot chamber 58 of the sub valve 13 via the discharge port B. Accordingly, since the auxiliary valve 13 is switched to the exhaust position P1, the compressed air discharge device 10a shown in FIG. 6 operates in the same manner as the compressed air discharge device 10 shown in FIG. When the main valve 12a is switched to the discharge position M2, the communication between the air supply source 20 and the input port C is interrupted, but when the sub valve 13 is switched to the supply position P2, the supply passage 61 and the supply / discharge flow Compressed air is supplied to the pilot chamber 37 via the passage 71, and the main valve 12 is switched to the cutoff position M2.

  The main valve 12 shown in FIG. 3 is a poppet type two-way valve, whereas the main valve 12 shown in FIG. 6 is a spool type three-way valve.

  FIG. 7 is a pneumatic circuit showing a compressed air discharge device 10b which is another modified example. In FIG. 7, members that are the same as those shown in FIG. 4 are given the same reference numerals.

  In the main valve 12 b shown in FIG. 7, a thrust in the direction toward the cutoff position M <b> 1 is always applied by the return spring 85. In the main valve 12b of this embodiment, a return spring 85 as a return mechanism is mounted in the return pilot chamber 38 of the main valve 12 shown in FIG. 3, and the thrust in the direction toward the cutoff position M1 is applied to the main valve shaft by the return spring 85. 26 is energized. The spring force in the return direction by the return spring 85 is set to a value smaller than the thrust applied by the piston 31 to the main valve shaft 26 in the direction toward the discharge position M2. Therefore, when compressed air is supplied to the pilot chamber 37, the thrust in the direction toward the discharge position M2 is larger than the thrust for return that is biased toward the cutoff position M1 by the return spring 85. Is switched to the discharge position M2.

  In the auxiliary valve 13 shown in FIG. 7, thrust in the direction toward the air supply position P <b> 2 is always applied by the auxiliary valve return spring 86. In the auxiliary valve 13 of this form, the auxiliary valve return spring 86 as a return mechanism is mounted in the auxiliary valve return pilot chamber 59 of the auxiliary valve 13 shown in FIG. 2, and a return thrust in the direction toward the air supply position P2. Is urged toward the pilot valve shaft 43 by the auxiliary valve return spring 86. The spring force in the return direction by the auxiliary valve return spring 86 is set to a value smaller than the thrust applied to the pilot valve shaft 43 in the direction toward the exhaust position P1 by the auxiliary valve piston 55. Therefore, when the compressed air is supplied to the auxiliary valve pilot chamber 58, the compressed air in the direction toward the exhaust position P1 rather than the return thrust biased toward the air supply position P2 by the auxiliary valve return spring 86. Since the thrust is large, the auxiliary valve 13 is switched to the exhaust position P1.

  Thus, the return mechanism for biasing the thrust in the return direction toward the shut-off position M1 and the return for biasing the thrust in the return direction toward the air supply position P2 The mechanism includes a form using a piston and a form using a spring member. Further, there is a form in which only one return mechanism of the main valve 12 and the sub valve 13 is used as a spring member.

  In each of the compressed air discharge devices 10, 10a, 10b, the supply throttle 62 is a variable throttle, and the exhaust throttle 75 is a fixed throttle. On the other hand, when the supply air restrictor 62 is a fixed restrictor and the exhaust restrictor is a variable restrictor, the compressed air discharge devices 10, 10a and 10b can change the discharge time of the compressed air from the discharge port 15. Become. If both the air supply throttle 62 and the exhaust throttle 75 are variable throttles, both the discharge time and the discharge stop time can be changed.

  Since the compressed air discharge devices 10, 10a, and 10b can be switched to either the intermittent discharge mode or the continuous discharge mode by the mode switching valve 77, it is possible to perform an optimal air ejection operation according to the type of the object. . Thereby, the versatility of the compressed air discharge device 10, 10a, 10b is improved. Further, since the primary air supplied from the air supply source 20 to the supply port 14 is ejected from the ejection port 82 via the discharge port 15, the pressure of the primary side air supplied to the supply port 14, that is, the original pressure is adjusted. Compressed air having an arbitrary pressure can be ejected from the ejection port 82.

  The mode switching valve 77 is also provided in the compressed air discharge devices 10a and 10b shown in FIG. 6 and FIG. 7, but the compressed air discharge devices 10a and 10b shown in FIG. 10, when the mode switching valve 77 is not provided, the compressed air discharge device only in the intermittent discharge mode is obtained.

  The present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the scope of the invention. As described above, the compressed air discharge devices 10, 10a, and 10b are applied to an air gun for spraying compressed air onto an object. For example, ionized air is sprayed onto a workpiece or a tool. The compressed air discharge devices 10 and 10a can be applied to various air blowing tools such as devices.

10, 10a, 10b Compressed air discharge device 12, 12a Main valve 13 Sub valve 14 Supply port 15 Discharge port 20 Air supply source 26 Main valve shaft 31 Piston 33 Return piston 37 Pilot chamber 38 Return pilot chamber 39 Branch flow path 43 Pilot valve Shaft 55 Sub-valve piston 56 Sub-valve return piston 58 Sub-valve pilot chamber 59 Sub-valve return pilot chamber 61 Air supply passage 71 Supply / discharge passage 72 Main pilot passage 73 Sub pilot passage 74 Exhaust passage 76 Supply passage 77 Mode Switching valve 78 Discharge flow path 81 Discharge operation valve 82 Spout 85 Return spring 86 Sub valve return spring A Supply port B Discharge port C Input port D Output port E Exhaust port F Communication port M1 Shut off position M2 Discharge position P1 Exhaust position P2 Supply position

Claims (10)

A compressed air discharge device that discharges compressed air supplied from an air supply source from a discharge port,
A discharge that causes the air supply port and the discharge port to communicate with each other against a thrust force that biases the air supply port connected to the air supply source and a discharge port that discharges compressed air to a blocking position that blocks communication. A main valve with a piston disposed in a pilot chamber to which compressed air is applied to bias the position;
The communication between the output port and the input port is interrupted against the thrust force urging to an air supply position that communicates the output port communicating with the pilot chamber and the input port supplied with compressed air. A sub-valve having a sub-valve piston disposed in a sub-valve pilot chamber to which compressed air for energizing an exhaust position for communicating the port and the exhaust port is supplied;
A main pilot passage that communicates the discharge port with the sub-valve pilot chamber and that supplies compressed air to the sub-valve pilot chamber when the main valve is in the discharge position;
A supply / exhaust flow path for communicating the pilot chamber and the output port, and discharging the air in the pilot chamber from the exhaust port when the sub-valve is in the exhaust position;
Compressed air discharge device. The compressed air discharge device according to claim 1,
The main valve includes a return piston that is disposed in a return pilot chamber to which compressed air is supplied and that has a smaller diameter than the piston and biases thrust toward the blocking position, or a return spring that biases thrust toward the blocking position. A compressed air discharge device. The compressed air discharge device according to claim 1 or 2,
A sub-valve return piston that is arranged in a sub-valve return pilot chamber to which compressed air is supplied and has a smaller diameter than the sub-valve piston and biases thrust toward the supply position, or bias thrust toward the supply position The compressed air discharge device, wherein the auxiliary valve has an auxiliary valve return spring. In the compressed air discharge device according to any one of claims 1 to 3,
A compressed air discharge device having a mode switching valve for switching a discharge mode between an intermittent discharge mode for opening / closing the exhaust port and intermittently discharging compressed air from the discharge port and a continuous discharge mode for discharging continuously .   The compressed air discharge apparatus of any one of Claims 1-4 WHEREIN: The compressed air discharge apparatus provided the supply air throttle in the supply flow path which supplies compressed air to the said input port.   6. The compressed air discharge device according to claim 5, wherein the supply throttle is a variable throttle.   The compressed air discharge device according to any one of claims 1 to 5, wherein the exhaust port communicates with the atmosphere through an exhaust throttle.   The compressed air discharge apparatus according to claim 7, wherein the exhaust throttle is a fixed throttle.   8. The compressed air discharge device according to claim 7, wherein the exhaust throttle is a variable throttle.   The compressed air discharge apparatus of any one of Claims 1-9 WHEREIN: The discharge operation operated to the position which jets the compressed air discharged by the said discharge outlet from the jet nozzle outside, and the position which stops jetting A compressed air discharge device, wherein a valve is provided in a discharge flow path communicating with the discharge port.

Images