JP7569745B2 - Pulse Air Generator - Google Patents

Description

The present invention relates to a pulse air generator.

Conventionally, pulse air generators that intermittently discharge air from a discharge port provided in a body have been known. For example, in Patent Document 1, it is possible to adjust the discharge time during which air is discharged from the discharge port. Also, for example, in Patent Document 2, it is possible to simultaneously adjust the discharge time during which air is discharged from the discharge port and the cut-off time during which the discharge of air from the discharge port is cut off.

Patent No. 5551224 Patent No. 6591686

However, in Patent Document 1, although it is possible to adjust the discharge time during which air is discharged from the discharge port, it is not possible to adjust the blocking time during which the discharge of air from the discharge port is blocked, making it difficult to achieve energy conservation for air. Also, in Patent Document 2, for example, if the discharge time during which air is discharged from the discharge port is shortened, the blocking time during which the discharge of air from the discharge port is blocked also becomes shorter. Furthermore, for example, if the blocking time during which the discharge of air from the discharge port is blocked is lengthened, the discharge time during which air is discharged from the discharge port also becomes longer. Therefore, it is difficult to achieve energy conservation for air.

The pulse air generator that solves the above problem is a pulse air generator that intermittently discharges air from a discharge port provided in a body, and includes a valve hole formed in the body, a first spool valve and a second spool valve that are accommodated in the valve hole so as to be capable of reciprocating and that are arranged adjacent to each other in the axial direction of the valve hole, a supply port, a first output port, a second output port, and a discharge port that are formed in the body and communicate with the valve hole, respectively, a first piston that moves integrally with the first spool valve, a second piston that moves integrally with the second spool valve, and a pilot air valve that moves the first piston. a first pilot chamber to which pilot air for moving the second piston is supplied and discharged; a second pilot chamber to which pilot air for moving the second piston is supplied and discharged; a first communication passage connected to the discharge port and communicating between the first output port and the first pilot chamber; a second communication passage communicating between the second output port and the second pilot chamber; and a pressure adjusting valve provided in the first communication passage or the second communication passage and adjusting a flow rate of air supplied from the first output port to the first pilot chamber via the first communication passage, or adjusting a flow rate of air supplied from the second output port to the second pilot chamber via the second communication passage. a first adjusting valve and a second adjusting valve provided in the first communicating passage or the second communicating passage and configured to adjust a flow rate of air discharged from the first pilot chamber to the outside via the first communicating passage and the discharge port, or to adjust a flow rate of air discharged from the second pilot chamber to the outside via the second communicating passage, the second output port, and the exhaust port, wherein the first spool valve is configured to be in a first position where, as air is discharged from the first pilot chamber, the flow of air is blocked between the supply port and the second output port, and the flow of air is permitted between the second output port and the exhaust port. When the first spool valve is switched to the first position, the second spool valve switches to a third position that allows air to flow between the supply port and the first output port and blocks air flow between the second output port and the exhaust port, and when the first spool valve is switched to the first position, the second spool valve switches to a fourth position that blocks air flow between the supply port and the first output port, and when the first spool valve is switched to the second position, the second spool valve switches to a third position that allows air to flow between the supply port and the first output port.

In the above-mentioned pulse air generator, the first and second regulating valves may each be provided on one side of the body.

This invention makes it easier to save energy on air.

1 is a cross-sectional view showing a schematic overall configuration of an air blow gun according to an embodiment; FIG. 3 is an enlarged cross-sectional view of a portion of the air blow gun. FIG. 3 is an enlarged cross-sectional view of a portion of the air blow gun. FIG. 3 is an enlarged cross-sectional view of a portion of the air blow gun. FIG. 3 is an enlarged cross-sectional view of a portion of the air blow gun. FIG. 11 is an enlarged cross-sectional view showing a portion of an air blow gun in another embodiment. FIG. 11 is an enlarged cross-sectional view showing a portion of an air blow gun in another embodiment.

An embodiment in which a pulse air generator is embodied in an air blow gun will be described below with reference to Figs.
(Overall configuration of air blow gun 10)
1, an air blow gun 10, which is a pulse air generator, includes a pulse generating unit 11 and a manual valve unit 12. The pulse generating unit 11 includes a body 13. The body 13 is provided with a discharge port 14. The air blow gun 10 intermittently discharges air from the discharge port 14.

(Configuration of body 13)
The body 13 has a valve casing 15, a flow passage forming block 16, and a base 17. The valve casing 15 has a casing main body 18, a first connecting block 19, and a second connecting block 20. The casing main body 18, the first connecting block 19, and the second connecting block 20 are made of, for example, a synthetic resin material.

(Configuration of casing body 18)
As shown in FIG. 2, the casing body 18 is in the shape of a long and narrow rectangular block. The casing body 18 has a first end face 181 facing the first connection block 19. The first end face 181 is an end face located on one side of the longitudinal direction of the casing body 18. The casing body 18 has a second end face 182 facing the second connection block 20. The second end face 182 is an end face located on the other side of the longitudinal direction of the casing body 18. The casing body 18 also has a first opposing surface 183 facing the flow passage forming block 16. Furthermore, the casing body 18 has a second opposing surface 184 facing the base 17. The first opposing surface 183 and the second opposing surface 184 each extend in the longitudinal direction of the casing body 18. The first opposing surface 183 and the second opposing surface 184 connect the first end face 181 and the second end face 182. The first opposing surface 183 is a surface located on the opposite side to the second opposing surface 184 .

A valve hole 21 is formed in the casing body 18. Thus, the valve hole 21 is formed in the body 13. The valve hole 21 is a circular hole. The valve hole 21 extends in the longitudinal direction of the casing body 18. One end of the valve hole 21 opens to the first end face 181 of the casing body 18. The other end of the valve hole 21 opens to the second end face 182 of the casing body 18. Thus, the valve hole 21 penetrates the casing body 18 in the longitudinal direction.

The casing body 18 is formed with a supply port 22, a first output port 23, a second output port 24, and a discharge port 25. Therefore, the supply port 22, the first output port 23, the second output port 24, and the discharge port 25 are formed in the body 13. The supply port 22, the first output port 23, the second output port 24, and the discharge port 25 are each connected to the valve hole 21. The discharge port 25, the second output port 24, the supply port 22, and the first output port 23 are formed in the casing body 18 in this order from one end to the other end in the longitudinal direction of the casing body 18. The supply port 22, the first output port 23, the second output port 24, and the discharge port 25 open to the first opposing surface 183. The supply port 22 and the second output port 24 also open to the second opposing surface 184.

A communication port 26 is formed in the casing body 18. The communication port 26 is disposed between the supply port 22 and the second output port 24 in the longitudinal direction of the casing body 18. The communication port 26 communicates with the valve hole 21. The communication port 26 opens to the first opposing surface 183.

(Configuration of base 17)
The base 17 is in the shape of a long and narrow rectangular block. The base 17 has a first base surface 171 that faces the second opposing surface 184 of the casing body 18. The base 17 also has a second base surface 172 that is the surface opposite to the first base surface 171. The first base surface 171 and the second base surface 172 extend in the longitudinal direction of the base 17. The base 17 is disposed relative to the casing body 18 with the first base surface 171 facing the second opposing surface 184 of the casing body 18 via the plate-shaped first gasket 27. The base 17 is connected to the second opposing surface 184 of the casing body 18 via the plate-shaped first gasket 27.

The base 17 has a base supply flow passage 17a. The base supply flow passage 17a opens to the first base surface 171. The base 17 has a joint mounting hole 17b. The joint mounting hole 17b opens to the second base surface 172. The base supply flow passage 17a and the joint mounting hole 17b are connected to each other. The base 17 has a base communication flow passage 17c. One end of the base communication flow passage 17c opens to the first base surface 171. The other end of the base communication flow passage 17c opens to a base end surface 17d, which is an end surface located on one side of the longitudinal direction of the base 17.

(Configuration of first gasket 27)
The first gasket 27 provides a seal between the second opposing surface 184 of the casing body 18 and the first base surface 171 of the base 17. The first gasket 27 is formed with a first communication hole 27a that communicates between the supply port 22 and the base supply flow path 17a. The first gasket 27 is formed with a second communication hole 27b that communicates between the second output port 24 and the base communication flow path 17c.

(Configuration of first connecting block 19)
The first connection block 19 has a first connection surface 191 that is connected to the first end surface 181 of the casing main body 18. The first connection block 19 also has a third opposing surface 192 that faces the flow path forming block 16. The first connection block 19 is connected to the casing main body 18 with the first connection surface 191 and the first end surface 181 of the casing main body 18 butting against each other.

The first connecting block 19 has a first piston accommodating recess 19a. The first piston accommodating recess 19a opens to the first connecting surface 191. The first connecting block 19 has a valve mounting hole 19b and a first flow path 19c. The valve mounting hole 19b opens to a valve mounting surface 193, which is the end surface of the first connecting block 19 opposite to the first connecting surface 191. The valve mounting hole 19b opens to the bottom surface of the first piston accommodating recess 19a. Therefore, the valve mounting hole 19b and the first piston accommodating recess 19a are in communication. One end of the first flow path 19c opens to the third opposing surface 192. The other end of the first flow path 19c opens to the inner circumferential surface of the valve mounting hole 19b.

(Configuration of second connecting block 20)
The second connection block 20 has a second connection surface 201 that is connected to the second end surface 182 of the casing body 18 and the base end surface 17d of the base 17. The second connection block 20 is connected to the casing body 18 and the base 17 with the second connection surface 201 butting against the second end surface 182 of the casing body 18 and a part of the base end surface 17d of the base 17.

The second connecting block 20 has a second piston accommodating recess 20a. The second piston accommodating recess 20a opens to the second connecting surface 201. The second connecting block 20 has a second flow path 20b. One end of the second flow path 20b opens to a portion of the second connecting surface 201 that faces the base 17. The other end of the second flow path 20b opens to the bottom surface of the second piston accommodating recess 20a. The second flow path 20b communicates with the base connecting flow path 17c.

(Configuration of flow path forming block 16)
The flow passage forming block 16 is in the shape of a flat rectangular block. The flow passage forming block 16 has block faces 161 disposed opposite the first opposing face 183 of the casing body 18 and the third opposing face 192 of the first connection block 19. The block faces 161 extend in the longitudinal direction of the flow passage forming block 16. The flow passage forming block 16 is connected to the casing body 18 with the second gasket 28 interposed between the block face 161 and the first opposing face 183 of the casing body 18.

The flow passage forming block 16 has a valve mounting recess 16a and a joint mounting hole 16b. The valve mounting recess 16a opens to a valve mounting surface 162, which is an end face located on one side of the flow passage forming block 16 in the longitudinal direction. The valve mounting surface 162, together with a valve mounting surface 193 of the first connecting block 19, forms one surface 131 of the body 13. The joint mounting hole 16b opens to a joint mounting surface 163, which is an end face located on the other side of the flow passage forming block 16 in the longitudinal direction.

The passage forming block 16 has a first block communication passage 16c, a second block communication passage 16d, and a third block communication passage 16e. One end of the first block communication passage 16c opens to the block face 161. The other end of the first block communication passage 16c communicates with the joint mounting hole 16b. One end of the second block communication passage 16d communicates with the middle of the first block communication passage 16c. The other end of the second block communication passage 16d opens to the bottom surface of the valve mounting recess 16a. One end of the third block communication passage 16e opens to the inner peripheral surface of the valve mounting recess 16a. The other end of the third block communication passage 16e opens to a portion of the block face 161 facing the first connection block 19.

An annular seal member 29 is attached to the opening of the third block communication flow passage 16e on the block face 161 side. The seal member 29 seals between the flow passage forming block 16 and the first connection block 19 at the opening of the third block communication flow passage 16e on the block face 161 side. The third block communication flow passage 16e and the first flow passage 19c are in communication.

A communication recess 30 is formed on the block surface 161 of the flow passage forming block 16. The communication recess 30 is formed on the block surface 161 at a position overlapping the supply port 22 and the communication port 26.

(Configuration of second gasket 28)
The second gasket 28 seals between the first opposing surface 183 of the casing body 18 and the block surface 161 of the flow passage forming block 16. The second gasket 28 is formed with a first communication hole 28a that communicates the first output port 23 with the first block communication flow passage 16c. The second gasket 28 is formed with a second communication hole 28b that communicates the supply port 22 with the communication recess 30. The second gasket 28 is formed with a third communication hole 28c that communicates the communication port 26 with the communication recess 30. The supply port 22 and the communication port 26 are always in communication with each other via the second communication hole 28b, the communication recess 30, and the third communication hole 28c.

(Regarding the discharge port 14)
The air blow gun 10 is provided with a discharge port joint 31. The discharge port joint 31 has a discharge port 14. The discharge port joint 31 is attached to the joint mounting hole 16b. Therefore, the discharge port 14 is provided in the body 13. The discharge port 14 is connected to the first block communication passage 16c.

(Configuration of the first spool valve 32 and the second spool valve 33)
The air blow gun 10 includes a first spool valve 32 and a second spool valve 33. The first spool valve 32 and the second spool valve 33 are accommodated in the valve hole 21 so as to be capable of reciprocating motion. The first spool valve 32 and the second spool valve 33 are arranged adjacent to each other in the axial direction of the valve hole 21. The first spool valve 32 and the second spool valve 33 are accommodated in the valve hole 21 with the axis of the first spool valve 32 and the axis of the second spool valve 33 coinciding with each other.

(Configuration of the first piston 34 and the second piston 35)
The air blow gun 10 includes a first piston 34 and a second piston 35. The first piston 34 is disk-shaped. The first piston 34 is connected to an end of the first spool valve 32 opposite to the second spool valve 33. The first piston 34 moves integrally with the first spool valve 32. The second piston 35 is disk-shaped. The second piston 35 is connected to an end of the second spool valve 33 opposite to the first spool valve 32. The second piston 35 moves integrally with the second spool valve 33. The outer diameter of the first piston 34 and the outer diameter of the second piston 35 are the same.

(Regarding the first pilot chamber 36)
The end of the first spool valve 32 opposite to the second spool valve 33 can enter and exit the first piston accommodating recess 19a through the valve hole 21. A first piston 34 is accommodated in the first piston accommodating recess 19a. The first piston 34 can reciprocate in the first piston accommodating recess 19a. A first pilot chamber 36 is defined in the first piston accommodating recess 19a by the first piston 34. The first pilot chamber 36 is a space located closer to the bottom surface of the first piston accommodating recess 19a than the first piston 34 in the first piston accommodating recess 19a. Therefore, the first pilot chamber 36 and the valve mounting hole 19b are in communication. Pilot air for moving the first piston 34 is supplied to and discharged from the first pilot chamber 36.

(Regarding the second pilot chamber 37)
The end of the second spool valve 33 opposite to the first spool valve 32 can enter and exit the second piston accommodating recess 20a through the valve hole 21. A second piston 35 is accommodated in the second piston accommodating recess 20a. The second piston 35 can reciprocate in the second piston accommodating recess 20a. A second pilot chamber 37 is defined in the second piston accommodating recess 20a by the second piston 35. The second pilot chamber 37 is a space located closer to the bottom surface of the second piston accommodating recess 20a than the second piston 35 in the second piston accommodating recess 20a. Therefore, the second pilot chamber 37 and the second flow path 20b are in communication with each other. Pilot air that moves the second piston 35 is supplied to and discharged from the second pilot chamber 37.

The pressure-receiving area of the first piston 34 that receives the pressure of the pilot air in the first pilot chamber 36 is the same as the pressure-receiving area of the second piston 35 that receives the pressure of the pilot air in the second pilot chamber 37.

(First and second positions of the first spool valve 32)
When air is discharged from the first pilot chamber 36, the first spool valve 32 switches to a first position which blocks the flow of air between the communication port 26 and the second output port 24 and allows the flow of air between the second output port 24 and the discharge port 25. At this time, the supply port 22 and the communication port 26 are always in communication with each other via the second communication hole 28b, the communication recess 30, and the third communication hole 28c. Therefore, it can be said that when the first spool valve 32 is in the first position, the flow of air between the supply port 22 and the second output port 24 is blocked.

As shown in FIG. 3, when air is supplied to the first pilot chamber 36, the first spool valve 32 switches to a second position that allows air to flow between the communication port 26 and the second output port 24 and blocks air flow between the second output port 24 and the exhaust port 25. At this time, the supply port 22 and the communication port 26 are always in communication with each other via the second communication hole 28b, the communication recess 30, and the third communication hole 28c. Therefore, when the first spool valve 32 is in the second position, it can be said that air is allowed to flow between the supply port 22 and the second output port 24.

(Regarding the third and fourth positions of the second spool valve 33)
2, when the first spool valve 32 is switched to the first position, the second spool valve 33 is switched to a third position which allows air to flow between the supply port 22 and the first output port 23. Also, when the first spool valve 32 is switched to the second position, the second spool valve 33 is switched to a fourth position which blocks air from flowing between the supply port 22 and the first output port 23.

(Configuration of the first communication flow path 41 and the second communication flow path 42)
The air blow gun 10 has a first communication passage 41. The first communication passage 41 is composed of the first communication hole 28a, the first block communication passage 16c, the second block communication passage 16d, the valve mounting recess 16a, the third block communication passage 16e, the first passage 19c, and the valve mounting hole 19b. Therefore, the first communication passage 41 is connected to the discharge port 14, and communicates between the first output port 23 and the first pilot chamber 36.

The air blow gun 10 has a second communication passage 42. The second communication passage 42 is composed of the second communication hole 27b, the base communication passage 17c, and the second passage 20b. Therefore, the second communication passage 42 communicates between the second output port 24 and the second pilot chamber 37.

(Configuration of the first adjusting valve 51 and the second adjusting valve 52)
The air blow gun 10 includes a first adjusting valve 51 and a second adjusting valve 52. The first adjusting valve 51 and the second adjusting valve 52 are needle valves. The first adjusting valve 51 is attached to the valve mounting recess 16a. The first adjusting valve 51 is provided on a valve mounting surface 162 of the flow passage forming block 16. The second adjusting valve 52 is attached to the valve mounting hole 19b. The second adjusting valve 52 is provided on a valve mounting surface 193 of the first connecting block 19. Thus, the first adjusting valve 51 and the second adjusting valve 52 are each provided on one surface 131 of the body 13.

The first adjustment valve 51 and the second adjustment valve 52 are provided in the first communication passage 41. The first adjustment valve 51 adjusts the flow rate of air supplied from the first output port 23 to the first pilot chamber 36 via the first communication passage 41. The second adjustment valve 52 adjusts the flow rate of air discharged from the first pilot chamber 36 to the outside via the first communication passage 41 and the discharge port 14.

Because the specific configurations of the first adjusting valve 51 and the second adjusting valve 52 are the same, the configuration of the first adjusting valve 51 will be described in detail here, and the detailed description of the configuration of the second adjusting valve 52 will be omitted by assigning the same reference numerals, etc.

The first adjustment valve 51 includes a valve housing 53. The valve housing 53 is cylindrical. The valve housing 53 has an insertion hole 54 and an adjustment valve hole 55. The axis of the insertion hole 54 and the axis of the adjustment valve hole 55 coincide with the axis of the valve housing 53. The insertion hole 54 opens into one end face in the axial direction of the valve housing 53. The adjustment valve hole 55 opens into the other end face in the axial direction of the valve housing 53.

A part of the insertion hole 54 is a female threaded hole 56. The female threaded hole 56 is a portion of the insertion hole 54 that is toward one side in the axial direction of the valve housing 53. The adjustment valve hole 55 is connected to the other end of the insertion hole 54 in the axial direction of the valve housing 53. The diameter of the adjustment valve hole 55 is smaller than the diameter of the insertion hole 54.

The valve housing 53 has a radial hole 57. The radial hole 57 penetrates the valve housing 53 in the radial direction. The radial hole 57 is connected to a portion of the insertion hole 54 between the female thread hole 56 and the adjustment valve hole 55. The radial hole 57 connects the inside of the insertion hole 54 to the outside of the valve housing 53.

The first adjustment valve 51 has a needle valve body 58. The needle valve body 58 is columnar. The needle valve body 58 has an insertion portion 59 and a valve portion 60. The insertion portion 59 is columnar. A part of the insertion portion 59 is a male threaded portion 61. The male threaded portion 61 can be screwed into the female threaded hole 56. The valve portion 60 protrudes from an end face located on one side in the axial direction of the insertion portion 59. The valve portion 60 has a tapered shape. The valve portion 60 is inserted into the adjustment valve hole 55. The first adjustment valve 51 adjusts the insertion amount of the valve portion 60 into the adjustment valve hole 55 by adjusting the screwing position of the male threaded portion 61 relative to the female threaded hole 56. This adjusts the flow rate of air passing through the adjustment valve hole 55.

Specifically, for example, the greater the amount of insertion of the male threaded portion 61 into the adjustment valve hole 55 in the valve portion 60 by screwing the male threaded portion 61 into the female threaded hole 56, the smaller the flow rate of air passing through the adjustment valve hole 55. On the other hand, for example, the greater the amount of insertion of the male threaded portion 61 into the adjustment valve hole 55 in the valve portion 60 by screwing the male threaded portion 61 back into the female threaded hole 56, the greater the flow rate of air passing through the adjustment valve hole 55. Therefore, the first adjustment valve 51 adjusts the flow rate of air passing through the adjustment valve hole 55 by mechanically moving the needle valve body 58.

A lip seal 62 is attached to the outer peripheral surface of the valve housing 53. The lip seal 62 is annular with a V-shaped cross section. The lip seal 62 is attached to the outer peripheral surface of the valve housing 53 in a portion that covers the adjustment valve hole 55.

The lip seal 62 of the first adjustment valve 51 blocks the flow of air that has flowed from the second block communication passage 16d into the valve mounting recess 16a toward the third block communication passage 16e through the gap between the outer peripheral surface of the valve housing 53 and the inner peripheral surface of the valve mounting recess 16a. On the other hand, the lip seal 62 of the first adjustment valve 51 allows the flow of air that has flowed from the third block communication passage 16e into the valve mounting recess 16a toward the second block communication passage 16d through the gap between the outer peripheral surface of the valve housing 53 and the inner peripheral surface of the valve mounting recess 16a.

The lip seal 62 of the second adjusting valve 52 blocks the flow of air that has flowed from the first pilot chamber 36 into the valve mounting hole 19b from the gap between the outer peripheral surface of the valve housing 53 and the inner peripheral surface of the valve mounting hole 19b toward the first flow path 19c. On the other hand, the lip seal 62 of the second adjusting valve 52 allows the flow of air that has flowed from the first flow path 19c into the valve mounting hole 19b from the gap between the outer peripheral surface of the valve housing 53 and the inner peripheral surface of the valve mounting hole 19b toward the first pilot chamber 36.

(Configuration of manual valve unit 12)
As shown in FIG. 1, the manual valve unit 12 includes a manual valve block 70. The manual valve block 70 includes a cylindrical supply joint 71. The supply joint 71 is attached to the joint mounting hole 17b. The manual valve block 70 includes a first supply flow passage 72, a valve chamber 73, and a second supply flow passage 74. One end of the first supply flow passage 72 is connected to an air supply source 75. The other end of the first supply flow passage 72 is connected to the valve chamber 73. One end of the second supply flow passage 74 is connected to the valve chamber 73. The other end of the second supply flow passage 74 opens to the tip surface of the supply joint 71. Therefore, the inside of the supply joint 71 constitutes a part of the second supply flow passage 74. The second supply flow passage 74 is connected to the base supply flow passage 17a.

The manual valve unit 12 includes a valve body 76, a biasing spring 77, and a manual shaft 78. The valve body 76 is accommodated in the valve chamber 73. The manual valve block 70 has a valve seat 79. The valve seat 79 is arranged around the opening of the second supply flow path 74 on the valve chamber 73 side. The valve body 76 can be moved toward and away from the valve seat 79. The biasing spring 77 is accommodated in the valve chamber 73. The biasing spring 77 biases the valve body 76 toward the valve seat 79. When the valve body 76 is seated on the valve seat 79, communication between the valve chamber 73 and the second supply flow path 74 is blocked.

The manual shaft 78 is capable of retracting from the manual valve block 70. When the manual shaft 78 is pressed in a direction to retract into the manual valve block 70 while protruding from the manual valve block 70, the manual shaft 78 can press the valve body 76 in a direction away from the valve seat 79 against the biasing force of the biasing spring 77. When the manual shaft 78 presses the valve body 76 in a direction away from the valve seat 79 against the biasing force of the biasing spring 77 and the valve body 76 is separated from the valve seat 79, air is permitted to flow from the first supply flow path 72 to the second supply flow path 74 via the valve chamber 73.

(Action)
Next, the operation of this embodiment will be described.
When the manual shaft 78 of the air blow gun 10 is pressed from a state in which it protrudes from the manual valve block 70 toward a direction in which it retracts into the manual valve block 70 , air is intermittently discharged from the discharge port 14 .

Specifically, when the manual shaft 78 is pressed in a direction to sink into the manual valve block 70, the manual shaft 78 presses the valve body 76 in a direction to move away from the valve seat 79 against the biasing force of the biasing spring 77. As a result, the valve body 76 moves away from the valve seat 79, and air from the air supply source 75 flows in the order of the first supply flow path 72, the valve chamber 73, the second supply flow path 74, and the base supply flow path 17a.

As shown in FIG. 2, the air flowing into the base supply passage 17a is supplied to the supply port 22 through the first communication hole 27a. Then, a part of the air supplied to the supply port 22 flows to the communication port 26 through the second communication hole 28b, the communication recess 30, and the third communication hole 28c. At this time, for example, when the first spool valve 32 is moved to the first position and the second spool valve 33 is moved to the third position, a part of the air supplied to the supply port 22 is output to the first output port 23. Then, the air output from the supply port 22 to the first output port 23 is discharged to the outside from the discharge port 14 through the first communication hole 28a and the first block communication passage 16c.

Also, a portion of the air flowing through the first block communication passage 16c flows into the inside of the valve mounting recess 16a via the second block communication passage 16d. The air that flows into the inside of the valve mounting recess 16a passes through the adjustment valve hole 55 and the diameter hole 57 of the first adjustment valve 51 and flows toward the third block communication passage 16e. Then, the air flowing toward the third block communication passage 16e flows into the valve mounting hole 19b via the third block communication passage 16e and the first passage 19c.

A portion of the air that flows into the valve mounting hole 19b passes through the diameter hole 57 and the adjustment valve hole 55 of the second adjustment valve 52 and flows toward the first pilot chamber 36. In addition, the lip seal 62 of the second adjustment valve 52 allows the air that flows into the valve mounting hole 19b from the first flow path 19c to flow toward the first pilot chamber 36 through the gap between the outer peripheral surface of the valve housing 53 and the inner peripheral surface of the valve mounting hole 19b. Therefore, the remaining air that flows into the valve mounting hole 19b passes between the outer peripheral surface of the valve housing 53 and the inner peripheral surface of the valve mounting hole 19b and flows toward the first pilot chamber 36.

As shown in FIG. 3, air flowing toward the first pilot chamber 36 is supplied to the first pilot chamber 36 from the valve mounting hole 19b. In this way, air is supplied to the first pilot chamber 36 from the first output port 23 through the first communication passage 41. This causes the first spool valve 32 to move from the first position to the second position. Then, air flowing from the supply port 22 through the second communication hole 28b, the communication recess 30, and the third communication hole 28c to the communication port 26 is output to the second output port 24.

As shown in FIG. 4, the air output to the second output port 24 is supplied to the second pilot chamber 37 via the second communication hole 27b, the base communication passage 17c, and the second passage 20b. In this way, air is supplied from the second output port 24 to the second pilot chamber 37 via the second communication passage 42. This causes the second spool valve 33 to move from the third position to the fourth position. As a result, the flow of air between the supply port 22 and the first output port 23 is blocked, and the discharge of air to the outside from the discharge port 14 is blocked.

The first adjustment valve 51 adjusts the flow rate of air supplied from the first output port 23 to the first pilot chamber 36 via the first communication passage 41, thereby adjusting the time until the first pilot chamber 36 is filled with air. As a result, the time until the second pilot chamber 37 is filled with air is also adjusted. This adjusts the discharge time during which air is discharged to the outside from the discharge port 14.

As shown in FIG. 5, when the second spool valve 33 is moved to the fourth position, the flow of air between the supply port 22 and the first output port 23 is blocked, so air is discharged from the first pilot chamber 36 to the outside through the first communication passage 41 and the discharge port 14. As a result, the first spool valve 32 moves from the second position to the first position. Then, air is permitted to flow between the second output port 24 and the discharge port 25, so air is discharged from the second pilot chamber 37 to the outside through the second communication passage 42, the second output port 24, and the discharge port 25. As a result, as shown in FIG. 2, the second spool valve 33 moves from the fourth position to the third position. As a result, air is permitted to flow between the supply port 22 and the first output port 23, and the air output from the supply port 22 to the first output port 23 is discharged to the outside from the discharge port 14 through the first communication passage 41.

The second adjustment valve 52 adjusts the flow rate of air discharged from the first pilot chamber 36 to the outside via the first communication passage 41 and the discharge port 14, thereby adjusting the time until air is discharged from the first pilot chamber 36. As a result, the time until air is discharged from the second pilot chamber 37 is also adjusted. This adjusts the blocking time during which the discharge of air from the discharge port 14 is blocked.

(effect)
The above embodiment can provide the following effects.
(1) The first adjusting valve 51 adjusts the flow rate of air supplied from the first output port 23 to the first pilot chamber 36 through the first communication passage 41, thereby adjusting the time until the first pilot chamber 36 is filled with air. As a result, the time until the second pilot chamber 37 is filled with air is also adjusted. This makes it possible to adjust the discharge time during which air is discharged to the outside from the discharge port 14. In addition, the second adjusting valve 52 adjusts the flow rate of air discharged from the first pilot chamber 36 to the outside through the first communication passage 41 and the discharge port 14, thereby adjusting the time until air is discharged from the first pilot chamber 36. As a result, the time until air is discharged from the second pilot chamber 37 is also adjusted. This makes it possible to adjust the blocking time during which the discharge of air from the discharge port 14 is blocked. As described above, the discharge time during which air is discharged from the discharge port 14 and the blocking time during which the discharge of air from the discharge port 14 is blocked can be adjusted separately. Therefore, for example, it becomes possible to drastically shorten the discharge time during which air is discharged from the discharge port 14 and drastically lengthen the blocking time during which the discharge of air from the discharge port 14 is blocked, making it easier to achieve energy conservation of air.

(2) The first adjusting valve 51 and the second adjusting valve 52 are each provided on one surface 131 of the body 13. This allows the first adjusting valve 51 and the second adjusting valve 52 to be arranged together on one surface 131 of the body 13. For this reason, the air blow gun 10 can be made more compact than when the first adjusting valve 51 and the second adjusting valve 52 are provided on different surfaces of the body 13, for example.

(Example of change)
The above embodiment can be modified as follows: The above embodiment and the following modifications can be combined with each other to the extent that no technical contradiction occurs.

As shown in FIG. 6, the first adjustment valve 51 and the second adjustment valve 52 may be provided in the second communication flow path 42, rather than in the first communication flow path 41. In this case, the first adjustment valve 51 adjusts the flow rate of air supplied from the second output port 24 to the second pilot chamber 37 through the second communication flow path 42. This adjusts the time until the second pilot chamber 37 is filled with air, so that the discharge time during which air is discharged to the outside from the discharge port 14 can be adjusted. In addition, the second adjustment valve 52 adjusts the flow rate of air discharged from the second pilot chamber 37 to the outside through the second communication flow path 42, the second output port 24, and the discharge port 25. This adjusts the time until air is discharged from the second pilot chamber 37, so that the cut-off time during which the discharge of air from the discharge port 14 is blocked can be adjusted. As a result, the discharge time during which air is discharged from the discharge port 14 and the cut-off time during which the discharge of air from the discharge port 14 is blocked can be adjusted separately. Therefore, for example, it is possible to extremely shorten the discharge time during which air is discharged from the discharge port 14, and extremely lengthen the interruption time during which the discharge of air from the discharge port 14 is interrupted, making it easier to conserve energy for air.

As shown in FIG. 7, the first regulating valve 51 and the second regulating valve 52 may be provided on different surfaces of the body 13, for example. In short, as long as the first regulating valve 51 and the second regulating valve 52 are provided in the first communication passage 41 or the second communication passage 42, respectively, the arrangement position of the first regulating valve 51 and the second regulating valve 52 with respect to the body 13 is not particularly limited. For example, the second regulating valve 52 may be provided in the first communication passage 41, and the first regulating valve 51 may be provided in the second communication passage 42. In this case, the first regulating valve 51 adjusts the flow rate of air supplied from the second output port 24 to the second pilot chamber 37 through the second communication passage 42. This adjusts the time until the second pilot chamber 37 is filled with air, so that the discharge time during which air is discharged to the outside from the discharge port 14 can be adjusted. In this case, the lip seal 62 of the first regulating valve 51 blocks the flow of air from the second passage 20b to the second pilot chamber 37. On the other hand, the lip seal 62 of the first adjustment valve 51 allows air to flow from the second pilot chamber 37 to the second flow path 20b.

Also, for example, the first adjustment valve 51 may be provided in the first communication flow path 41, and the second adjustment valve 52 may be provided in the second communication flow path 42. The second adjustment valve 52 adjusts the flow rate of air discharged from the second pilot chamber 37 to the outside via the second communication flow path 42, the second output port 24, and the exhaust port 25. This adjusts the time until air is discharged from the second pilot chamber 37, and therefore the blocking time during which the discharge of air from the discharge port 14 is blocked can be adjusted.

- In the embodiment, the communication recess 30 may not be formed on the block surface 161 of the flow passage forming block 16. In this case, for example, a through hole that communicates between the supply port 22 and the communication port 26 may be formed in a wall portion located between the supply port 22 and the communication port 26 in the casing body 18.

In the embodiment, the air blow gun 10 may include, instead of the manual valve unit 12, a solenoid valve unit that electrically controls the opening and closing of the valve body 76.
In the embodiment, the first piston 34 is not limited to a disk shape, and may be, for example, an elliptical plate shape or an oblong plate shape. In short, the shape of the first piston 34 is not particularly limited.

- In the embodiment, the second piston 35 is not limited to a disk shape, and may be, for example, an elliptical plate shape or an oblong plate shape. In short, the shape of the second piston 35 is not particularly limited.

- In the embodiment, the outer diameter of the first piston 34 and the outer diameter of the second piston 35 may be different. Therefore, the pressure-receiving area of the first piston 34 that receives the pressure of the pilot air in the first pilot chamber 36 may be different from the pressure-receiving area of the second piston 35 that receives the pressure of the pilot air in the second pilot chamber 37.

10...Air blow gun which is a pulse air generator, 13...Body, 14...Discharge port, 21...Valve hole, 22...Supply port, 23...First output port, 24...Second output port, 25...Exhaust port, 32...First spool valve, 33...Second spool valve, 34...First piston, 35...Second piston, 36...First pilot chamber, 37...Second pilot chamber, 41...First communication passage, 42...Second communication passage, 51...First adjustment valve, 52...Second adjustment valve, 131...One side.

Claims (2)

A pulse air generator that intermittently discharges air from a discharge port provided in a body,
A valve hole formed in the body;
a first spool valve and a second spool valve that are reciprocally accommodated in the valve hole and are disposed adjacent to each other in an axial direction of the valve hole;
a supply port, a first output port, a second output port, and a discharge port formed in the body and communicating with the valve hole, respectively;
a first piston that moves integrally with the first spool valve;
a second piston that moves integrally with the second spool valve;
a first pilot chamber to which pilot air for moving the first piston is supplied and discharged;
a second pilot chamber to which pilot air for moving the second piston is supplied and discharged;
a first communication passage connected to the discharge port and communicating between the first output port and the first pilot chamber;
a second communication passage communicating the second output port and the second pilot chamber;
a first adjusting valve that is provided in the first communication passage or the second communication passage and adjusts a flow rate of air supplied from the first output port to the first pilot chamber via the first communication passage or adjusts a flow rate of air supplied from the second output port to the second pilot chamber via the second communication passage;
a second adjustment valve that is provided in the first communication flow path or the second communication flow path and adjusts a flow rate of air discharged from the first pilot chamber to the outside through the first communication flow path and the discharge port, or adjusts a flow rate of air discharged from the second pilot chamber to the outside through the second communication flow path, the second output port, and the discharge port,
the first spool valve is switched to a first position where air is blocked between the supply port and the second output port and air is permitted to flow between the second output port and the exhaust port when air is discharged from the first pilot chamber, and is switched to a second position where air is permitted to flow between the supply port and the second output port and air is blocked between the second output port and the exhaust port when air is supplied to the first pilot chamber,
the second spool valve is switched to a third position allowing air to flow between the supply port and the first output port when the first spool valve is switched to the first position, and is switched to a fourth position blocking air flow between the supply port and the first output port when the first spool valve is switched to the second position. The pulse air generator according to claim 1, characterized in that the first and second regulating valves are each provided on one side of the body.