Pulse air generating device

Abstract

The present invention provides a pulse air generating device, comprising: an ejection port, a supply port, a first output port, a second output port, and a discharge port; a first piston; a second piston; a first pilot chamber; a second pilot chamber; a first communication flow path that communicates the first output port and the first pilot chamber with each other; a second communication flow path that communicates the second output port and the second pilot chamber with each other; a first regulating valve that regulates the flow rate of air supplied from the first output port to the first pilot chamber via the first communication flow path or the flow rate of air supplied from the second output port to the second pilot chamber via the second communication flow path; and a second regulating valve that regulates the flow rate of air discharged from the first pilot chamber to the outside via the first communication flow path and the ejection port or the flow rate of air discharged from the second pilot chamber to the outside via the second communication flow path, the second output port, and the discharge port.

Description

Technical Field

[0001] The present disclosure relates to a pulse air generating device. Background Art

[0002] Conventionally, a pulse air generating device that intermittently ejects air from an ejection port provided in a body has been known. For example, the pulse air generating device described in Japanese Patent No. 5551224 can adjust the ejection time of the air ejected from the ejection port. In addition, for example, the pulse air generating device described in Japanese Patent No. 6591686 can adjust the ejection time of the air ejected from the ejection port and can also adjust the truncation time during which the ejection of the air from the ejection port is truncated at the same time. Summary of the Invention

[0003] Problems to be Solved by the Invention

[0004] The pulse air generating device described in the first publication can adjust the ejection time of the air ejected from the ejection port, but cannot adjust the truncation time during which the ejection of the air from the ejection port is truncated. Therefore, it is difficult for such a pulse air generating device to effectively utilize air. In addition, in the pulse air generating device described in the second publication, for example, when the ejection time of the air ejected from the ejection port is shortened, the truncation time during which the ejection of the air from the ejection port is truncated is also shortened. Moreover, for example, when the truncation time during which the ejection of the air from the ejection port is truncated is extended, the ejection time of the air ejected from the ejection port is also extended. Therefore, it is difficult for such a pulse air generating device to effectively utilize air.

[0005] Means for Solving the Problems

[0006] One embodiment of the pulse air generating device of the present disclosure is a pulse air generating device that intermittently discharges air from an air outlet provided in the fuselage. The pulse air generating device includes: a valve hole formed in the fuselage; a first slide valve and a second slide valve; and a supply port, a first output port, a second output port, and a discharge port, which are formed in the fuselage and communicate with the valve hole respectively. The first slide valve and the second slide valve are accommodated in the valve hole so as to be able to reciprocate, and are arranged adjacent to each other in the axial direction of the valve hole. The pulse air generating device further includes a first piston that moves integrally with the first slide valve, a second piston that moves integrally with the second slide valve, a first pilot chamber, a second pilot chamber, a first communication flow path, a second communication flow path, a first regulating valve, and a second regulating valve. The pilot air that moves the first piston is supplied to the first pilot chamber and discharged from the first pilot chamber. The pilot air that moves the second piston is supplied to the second pilot chamber and discharged from the second pilot chamber. The first communication flow path is connected to the air outlet and communicates the first output port with the first pilot chamber with each other. The second communication flow path communicates the second output port with the second pilot chamber with each other. The first regulating valve is provided in the first communication flow path and regulates the flow rate of the air supplied from the first output port to the first pilot chamber via the first communication flow path; or is provided in the second communication flow path and regulates the flow rate of the air supplied from the second output port to the second pilot chamber via the second communication flow path. The second regulating valve is provided in the first communication flow path and regulates the flow rate of the air discharged from the first pilot chamber to the outside via the first communication flow path and the air outlet; or is provided in the second communication flow path and regulates the flow rate of the air discharged from the second pilot chamber to the outside via the second communication flow path, the second output port, and the discharge port. The first slide valve switches to the first position when the air is discharged from the first pilot chamber, and switches to the second position when the air is supplied to the first pilot chamber. The first position is the position where the first slide valve cuts off the air flow between the supply port and the second output port and allows the air flow between the second output port and the discharge port. The second position is the position where the first slide valve allows the air flow between the supply port and the second output port and cuts off the air flow between the second output port and the discharge port. The second slide valve switches to the third position where the air flow between the supply port and the first output port is allowed when the position of the first slide valve switches to the first position, and switches to the fourth position where the air flow between the supply port and the first output port is cut off when the position of the first slide valve switches to the second position. BRIEF DESCRIPTION OF THE DRAWINGS

[0007] Figure 1 is a cross-sectional view schematically showing the overall structure of an air spray gun in an embodiment.

[0008] Figure 2 is an enlarged view showing Figure 1 a cross-section of a part of the air spray gun.

[0009] Figure 3 is an enlarged view showing Figure 1 a cross-section of a part of the air spray gun.

[0010] Figure 4 is an enlarged view showing Figure 1 a cross-section of a part of the air spray gun.

[0011] Figure 5 is an enlarged view showing Figure 1 a cross-section of a part of the air spray gun.

[0012] Figure 6 is an enlarged cross-sectional view showing a part of the air spray gun in another embodiment.

[0013] Figure 7 is an enlarged cross-sectional view showing a part of the air spray gun in yet another embodiment. Detailed Embodiment

[0014] Hereinafter, according to Figures 1 to 5 an embodiment in which a pulse air generating device is embodied as an air spray gun will be described.

[0015] (Overall Structure of Air Spray Gun 10)

[0016] As Figure 1 shown, the air spray gun 10 as a pulse air generating device includes a pulse generating section 11 and a manual valve section 12. The pulse generating section 11 includes a body 13. A spray outlet 14 is provided in the body 13. And, the air spray gun 10 intermittently ejects air from the spray outlet 14.

[0017] (Structure of Body 13)

[0018] The body 13 has a valve housing 15, a flow path forming block 16, and a base 17. The valve housing 15 has a housing main body 18, a first connecting block 19, and a second connecting block 20. The housing main body 18, the first connecting block 19, and the second connecting block 20 are made of, for example, a synthetic resin material.

[0019] (Structure of Housing Main Body 18)

[0020] As Figure 2As shown, the housing main body 18 is in the shape of a slender rectangular block. The housing main body 18 has a first end face 181 opposite to the first connecting block 19. The first end face 181 is the end face located at the first end in the length direction of the housing main body 18. The housing main body 18 has a second end face 182 opposite to the second connecting block 20. The second end face 182 is the end face located at the second end in the length direction of the housing main body 18. In addition, the housing main body 18 has a first opposing face 183 opposite to the flow path forming block 16. Moreover, the housing main body 18 has a second opposing face 184 opposite to the base 17. The first opposing face 183 and the second opposing face 184 extend in the length direction of the housing main body 18 respectively. The first opposing face 183 and the second opposing face 184 connect the first end face 181 and the second end face 182 respectively. The first opposing face 183 is the face located on the opposite side with respect to the second opposing face 184.

[0021] A valve hole 21 is formed in the housing main body 18. The valve hole 21 is formed in the body 13. The valve hole 21 is in the shape of a circular hole. The valve hole 21 extends in the length direction of the housing main body 18. The first end of the valve hole 21 opens on the first end face 181 of the housing main body 18. The second end of the valve hole 21 opens on the second end face 182 of the housing main body 18. The valve hole 21 penetrates the housing main body 18 in the length direction.

[0022] A supply port 22, a first output port 23, a second output port 24, and a discharge port 25 are formed in the housing main body 18. 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 communicate with the valve hole 21 respectively. The discharge port 25, the second output port 24, the supply port 22, and the first output port 23 are arranged in this order from the first end to the second end in the length direction of the housing main body 18. The supply port 22, the first output port 23, the second output port 24, and the discharge port 25 open on the first opposing face 183. In addition, the supply port 22 and the second output port 24 also open on the second opposing face 184.

[0023] A communication port 26 is formed in the housing main body 18. The communication port 26 is arranged between the supply port 22 and the second output port 24 in the length direction of the housing main body 18. The communication port 26 communicates with the valve hole 21. The communication port 26 opens on the first opposing face 183.

[0024] (Structure of the base 17)

[0025] The base 17 is in the shape of a slender rectangular block. The base 17 has a first base surface 171 that faces the second opposite surface 184 of the housing body 18. Additionally, the base 17 has a second base surface 172 that is the surface on the opposite side of the first base surface 171. The first base surface 171 and the second base surface 172 extend in the length direction of the base 17. The base 17 is arranged relative to the housing body 18 such that the first base surface 171 faces the second opposite surface 184 of the housing body 18 with a plate-shaped first gasket 27 therebetween. The base 17 is connected to the second opposite surface 184 of the housing body 18 with the plate-shaped first gasket 27 therebetween.

[0026] The base 17 has a base supply flow path 17a. The base supply flow path 17a opens on the first base surface 171. The base 17 has a joint fitting hole 17b. The joint fitting hole 17b opens on the second base surface 172. The base supply flow path 17a and the joint fitting hole 17b communicate with each other. The base 17 has a base communication flow path 17c. One end of the base communication flow path 17c opens on the first base surface 171. The other end of the base communication flow path 17c opens on an end surface located at one end in the length direction of the base 17, that is, the base end surface 17d.

[0027] (Structure of the first gasket 27)

[0028] The first gasket 27 seals between the second opposite surface 184 of the housing body 18 and the first base surface 171 of the base 17. A first communication hole 27a that communicates the supply port 22 and the base supply flow path 17a with each other is formed in the first gasket 27. A second communication hole 27b that communicates the second output port 24 and the base communication flow path 17c with each other is formed in the first gasket 27.

[0029] (Structure of the first connecting block 19)

[0030] The first connecting block 19 has a first connecting surface 191 that is connected to the first end surface 181 of the housing body 18. Additionally, the first connecting block 19 has a third opposite surface 192 that faces the flow path forming block 16. The first connecting block 19 is connected to the housing body 18 in a state where the first connecting surface 191 abuts against the first end surface 181 of the housing body 18.

[0031] The first connecting block 19 has a first piston receiving recess 19a. The first piston receiving recess 19a opens on the first connecting surface 191. The first connecting block 19 has a valve fitting hole 19b and a first flow path 19c. The valve fitting hole 19b opens on the end surface of the first connecting block 19 opposite to the first connecting surface 191, that is, on the valve fitting surface 193. The valve fitting hole 19b opens on the bottom surface of the first piston receiving recess 19a. The valve fitting hole 19b communicates with the first piston receiving recess 19a. One end of the first flow path 19c opens on the third opposing surface 192. The other end of the first flow path 19c opens on the inner peripheral surface of the valve fitting hole 19b.

[0032] (Structure of the second connecting block 20)

[0033] The second connecting block 20 has a second connecting surface 201 that is connected to the second end surface 182 of the housing body 18 and the base end surface 17d of the base 17. The second connecting block 20 is connected to the housing body 18 and the base 17 in a state where a part of the second connecting surface 201 abuts against the second end surface 182 of the housing body 18 and the base end surface 17d of the base 17.

[0034] The second connecting block 20 has a second piston receiving recess 20a. The second piston receiving recess 20a opens on 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 at a position on the second connecting surface 201 opposite to the base 17. The other end of the second flow path 20b opens on the bottom surface of the second piston receiving recess 20a. The second flow path 20b communicates with the base communication flow path 17c.

[0035] (Structure of the flow path forming block 16)

[0036] The flow path forming block 16 is in the shape of a flat rectangular block. The flow path forming block 16 has a block surface 161 that is respectively disposed opposite to the first opposing surface 183 of the housing body 18 and the third opposing surface 192 of the first connecting block 19. The block surface 161 extends in the length direction of the flow path forming block 16. The flow path forming block 16 is connected to the housing body 18 in a state where the second gasket 28 is interposed between the block surface 161 and the first opposing surface 183 of the housing body 18.

[0037] The flow path forming block 16 has a valve fitting recess 16a and a joint fitting hole 16b. The valve fitting recess 16a opens on the valve fitting surface 162 which is the end surface at one end in the length direction of the flow path forming block 16. The valve fitting surface 162 and the valve fitting surface 193 of the first connecting block 19 together form one surface 131 of the fuselage 13. The joint fitting hole 16b opens on the joint fitting surface 163 which is the end surface at the other end in the length direction of the flow path forming block 16.

[0038] The flow path forming block 16 has a first block communication flow path 16c, a second block communication flow path 16d, and a third block communication flow path 16e. The first end of the first block communication flow path 16c opens on the block surface 161. The second end of the first block communication flow path 16c communicates with the joint fitting hole 16b. The first end of the second block communication flow path 16d communicates with the middle of the first block communication flow path 16c. The second end of the second block communication flow path 16d opens on the bottom surface of the valve fitting recess 16a. The first end of the third block communication flow path 16e opens on the inner peripheral surface of the valve fitting recess 16a. The second end of the third block communication flow path 16e opens at a position on the block surface 161 opposite to the first connecting block 19.

[0039] An annular sealing member 29 is installed at the opening of the second end of the third block communication flow path 16e. The sealing member 29 seals between the flow path forming block 16 and the first connecting block 19 at the opening of the second end of the third block communication flow path 16e. The third block communication flow path 16e and the first flow path 19c communicate with each other.

[0040] A communication recess 30 is formed on the block surface 161 of the flow path forming block 16. The communication recess 30 is formed at positions overlapping the supply port 22 and the communication port 26, respectively, on the block surface 161.

[0041] (Structure of the second gasket 28)

[0042] The second gasket 28 seals between the first opposing surface 183 of the housing main body 18 and the block surface 161 of the flow path forming block 16. A first communication hole 28a that communicates the first output port 23 and the first block communication flow path 16c with each other is formed in the second gasket 28. A second communication hole 28b that communicates the supply port 22 and the communication recess 30 with each other is formed in the second gasket 28. A third communication hole 28c that communicates the communication port 26 and the communication recess 30 with each other is formed in the second gasket 28. The supply port 22 and the communication port 26 are always communicated with each other through the second communication hole 28b, the communication recess 30, and the third communication hole 28c.

[0043] (Regarding the ejection port 14)

[0044] The air spray gun 10 is provided with an ejection port joint 31. The ejection port joint 31 has an ejection port 14. The ejection port joint 31 is fitted in the joint fitting hole 16b. The ejection port 14 is provided on the fuselage 13. The ejection port 14 communicates with the first block communication flow path 16c.

[0045] (Structure of the first spool valve 32 and the second spool valve 33)

[0046] The air spray gun 10 includes a first slide valve 32 and a second slide valve 33. The first slide valve 32 and the second slide valve 33 are accommodated in the valve hole 21 so as to be reciprocally movable. The first slide valve 32 and the second slide valve 33 are arranged adjacent to each other in the axial direction of the valve hole 21. The first slide valve 32 and the second slide valve 33 are accommodated in the valve hole 21 in a state where the axis of the first slide valve 32 and the axis of the second slide valve 33 are aligned with each other.

[0047] (Structure of the first piston 34 and the second piston 35)

[0048] The air spray gun 10 includes a first piston 34 and a second piston 35. The first piston 34 has a disc shape. The first piston 34 is connected to the end of the first slide valve 32 on the side opposite to the second slide valve 33. The first piston 34 moves integrally with the first slide valve 32. The second piston 35 has a disc shape. The second piston 35 is connected to the end of the second slide valve 33 on the side opposite to the first slide valve 32. The second piston 35 moves integrally with the second slide valve 33. The outer diameter of the first piston 34 is the same as the outer diameter of the second piston 35.

[0049] (Regarding the first pilot chamber 36)

[0050] The end of the first slide valve 32 on the side opposite to the second slide valve 33 can project in and out of the valve hole 21 into the first piston receiving recess 19a. The first piston 34 is received in the first piston receiving recess 19a. The first piston 34 can reciprocally move in the first piston receiving recess 19a. By the first piston 34, the first pilot chamber 36 is partitioned in the first piston receiving recess 19a. The first pilot chamber 36 is the space between the first piston 34 and the bottom surface of the first piston receiving recess 19a facing the first piston 34. The first pilot chamber 36 communicates with the valve assembly hole 19b. The pilot air that moves the first piston 34 is supplied to the first pilot chamber 36 and discharged from the first pilot chamber 36.

[0051] (Regarding the second pilot chamber 37)

[0052] The end of the second slide valve 33 on the side opposite to the first slide valve 32 can project in and out of the valve hole 21 into the second piston receiving recess 20a. The second piston 35 is received in the second piston receiving recess 20a. The second piston 35 can reciprocally move in the second piston receiving recess 20a. And, by the second piston 35, the second pilot chamber 37 is partitioned in the second piston receiving recess 20a. The second pilot chamber 37 is the space between the second piston 35 and the bottom surface of the second piston receiving recess 20a facing the second piston 35. The second pilot chamber 37 communicates with the second flow path 20b. The pilot air that moves the second piston 35 is supplied to the second pilot chamber 37 and discharged from the second pilot chamber 37.

[0053] The area of the portion of the first piston 34 that is subjected to the pilot air pressure in the first pilot chamber 36 is the same as the area of the portion of the second piston 35 that is subjected to the pilot air pressure in the second pilot chamber 37.

[0054] (Regarding the first position and the second position of the first spool valve 32)

[0055] By discharging air from the first pilot chamber 36, the first spool valve 32 switches to the first position where the flow of air between the communication port 26 and the second output port 24 is blocked and the flow of air between the second output port 24 and the discharge port 25 is allowed. At this time, the supply port 22 and the communication port 26 are always in communication with each other through the second communication hole 28b, the communication recess 30, and the third communication hole 28c. It can also be said that in the state where the first spool valve 32 is switched to the first position, the flow of air between the supply port 22 and the second output port 24 is blocked.

[0056] As Figure 3 shown, by supplying air to the first pilot chamber 36, the first spool valve 32 switches to the second position where the flow of air between the communication port 26 and the second output port 24 is allowed and the flow of air between the second output port 24 and the discharge port 25 is blocked. At this time, the supply port 22 and the communication port 26 are always in communication with each other through the second communication hole 28b, the communication recess 30, and the third communication hole 28c. It can also be said that in the state where the first spool valve 32 is switched to the second position, the flow of air between the supply port 22 and the second output port 24 is allowed.

[0057] (Regarding the third position and the fourth position of the second spool valve 33)

[0058] As Figure 2 shown, when the first spool valve 32 switches to the first position, the second spool valve 33 switches to the third position where the flow of air between the supply port 22 and the first output port 23 is allowed. In addition, as Figure 4 shown, when the first spool valve 32 switches to the second position, the second spool valve 33 switches to the fourth position where the flow of air between the supply port 22 and the first output port 23 is blocked.

[0059] (Structure of the first communication flow path 41 and the second communication flow path 42)

[0060] The air spray gun 10 is provided with a first communication flow path 41. The first communication flow path 41 is constituted by the first communication hole 28a, the first block communication flow path 16c, the second block communication flow path 16d, the valve mounting recess 16a, the third block communication flow path 16e, the first flow path 19c, and the valve mounting hole 19b. The first communication flow path 41 is connected to the spray port 14 and communicates the first output port 23 and the first pilot chamber 36 with each other.

[0061] The air spray gun 10 is provided with a second communication flow path 42. The second communication flow path 42 is constituted by a second communication hole 27b, a base communication flow path 17c, and a second flow path 20b. The second communication flow path 42 connects the second output port 24 and the second pilot chamber 37 to each other.

[0062] (Structures of the first regulating valve 51 and the second regulating valve 52)

[0063] The air spray gun 10 is provided with a first regulating valve 51 and a second regulating valve 52. The first regulating valve 51 and the second regulating valve 52 are needle valves. The first regulating valve 51 is assembled in the valve assembly recess 16a. The first regulating valve 51 is provided on the valve assembly surface 162 of the flow path forming block 16. The second regulating valve 52 is assembled in the valve assembly hole 19b. The second regulating valve 52 is provided on the valve assembly surface 193 of the first connecting block 19. The first regulating valve 51 and the second regulating valve 52 are respectively provided on one surface 131 of the fuselage 13.

[0064] The first regulating valve 51 and the second regulating valve 52 are provided in the first communication flow path 41. The first regulating valve 51 regulates the flow rate of the air supplied from the first output port 23 to the first pilot chamber 36 via the first communication flow path 41. The second regulating valve 52 regulates the flow rate of the air discharged from the first pilot chamber 36 to the outside via the first communication flow path 41 and the spray port 14.

[0065] Since the specific structures of the first regulating valve 51 and the second regulating valve 52 are the same, the structure of the first regulating valve 51 will be described in detail here. For the structure of the second regulating valve 52, the same reference numerals are attached and its detailed description is omitted.

[0066] The first regulating valve 51 includes a valve sleeve 53. The valve sleeve 53 is cylindrical. The valve sleeve 53 has an insertion hole 54 and a regulating valve hole 55. The axes of the insertion hole 54 and the regulating valve hole 55 are aligned with the axis of the valve sleeve 53. The insertion hole 54 opens on the first end surface located at one end in the axial direction of the valve sleeve 53. The regulating valve hole 55 opens on the second end surface located at the other end in the axial direction of the valve sleeve 53.

[0067] A part of the insertion hole 54 forms an internal thread hole 56. The internal thread hole 56 is the part of the insertion hole 54 near the first end surface of the valve sleeve 53. The regulating valve hole 55 communicates with the end of the insertion hole 54 inside the valve sleeve 53. The aperture of the regulating valve hole 55 is smaller than the aperture of the insertion hole 54.

[0068] The valve sleeve 53 has a radial hole 57. The radial hole 57 penetrates the valve sleeve 53 in the radial direction. The radial hole 57 communicates with the part between the internal thread hole 56 and the regulating valve hole 55 in the insertion hole 54. The radial hole 57 connects the inside of the insertion hole 54 and the outside of the valve sleeve 53 to each other.

[0069] The first regulating valve 51 includes 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 forms an external thread portion 61. The external thread portion 61 can be threadedly connected to the internal thread hole 56. The valve portion 60 protrudes from the end face located at one end 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 regulating valve hole 55. The first regulating valve 51 adjusts the threaded connection position of the external thread portion 61 with respect to the internal thread hole 56, thereby adjusting the insertion amount of the valve portion 60 into the regulating valve hole 55. Thereby, the flow rate of the air passing through the regulating valve hole 55 is adjusted.

[0070] Specifically, for example, when the external thread portion 61 is fastened to the internal thread hole 56, the larger the insertion amount of the valve portion 60 into the regulating valve hole 55, the smaller the flow rate of the air passing through the regulating valve hole 55. On the other hand, for example, when the external thread portion 61 is loosened with respect to the internal thread hole 56, the smaller the insertion amount of the valve portion 60 into the regulating valve hole 55, the larger the flow rate of the air passing through the regulating valve hole 55. Therefore, the first regulating valve 51 adjusts the flow rate of the air passing through the regulating valve hole 55 by mechanically moving the needle valve body 58.

[0071] A lip seal 62 is installed on the outer peripheral surface of the valve sleeve 53. The lip seal 62 is annular and has a V-shaped cross section. The lip seal 62 is installed on the outer peripheral surface of the valve sleeve 53 at a portion covering the regulating valve hole 55.

[0072] The lip seal 62 of the first regulating valve 51 cuts off the flow of air flowing from the second block communication flow path 16d into the valve assembly recess 16a via the space between the outer peripheral surface of the valve sleeve 53 and the inner peripheral surface of the valve assembly recess 16a to the third block communication flow path 16e. On the other hand, the lip seal 62 of the first regulating valve 51 allows the flow of air flowing from the third block communication flow path 16e into the valve assembly recess 16a via the space between the outer peripheral surface of the valve sleeve 53 and the inner peripheral surface of the valve assembly recess 16a to the second block communication flow path 16d.

[0073] The lip seal 62 of the second regulating valve 52 cuts off the flow of air flowing from the first pilot chamber 36 into the valve assembly hole 19b via the space between the outer peripheral surface of the valve sleeve 53 and the inner peripheral surface of the valve assembly hole 19b to the first flow path 19c. On the other hand, the lip seal 62 of the second regulating valve 52 allows the flow of air flowing from the first flow path 19c into the valve assembly hole 19b via the space between the outer peripheral surface of the valve sleeve 53 and the inner peripheral surface of the valve assembly hole 19b to the first pilot chamber 36.

[0074] (Structure of the manual valve portion 12)

[0075] As Figure 1As shown, the manual valve section 12 includes a manual valve block 70. The manual valve block 70 has a cylindrical supply joint 71. The supply joint 71 is assembled in the joint assembly hole 17b. The manual valve block 70 has a first supply flow path 72, a valve chamber 73, and a second supply flow path 74. One end of the first supply flow path 72 is connected to an air supply source 75. The other end of the first supply flow path 72 communicates with the valve chamber 73. One end of the second supply flow path 74 communicates with the valve chamber 73. The other end of the second supply flow path 74 opens on the front end face of the supply joint 71. The inside of the supply joint 71 forms a part of the second supply flow path 74. The second supply flow path 74 communicates with the base supply flow path 17a.

[0076] The manual valve section 12 includes a valve body 76, a biasing spring 77, and a manual shaft 78. The valve body 76 is housed in the valve chamber 73. The manual valve block 70 has a valve seat 79. The valve seat 79 is disposed around the open end of the second supply flow path 74 that communicates with the valve chamber 73. The valve body 76 can come into contact with and separate from the valve seat 79. The biasing spring 77 is housed in the valve chamber 73. The biasing spring 77 biases the valve body 76 toward the valve seat 79. In a state where the valve body 76 is seated on the valve seat 79, the communication between the valve chamber 73 and the second supply flow path 74 is cut off.

[0077] The manual shaft 78 can project from and sink into the manual valve block 70. In a state where the manual shaft 78 projects from the manual valve block 70, when the manual shaft 78 is pressed in a direction of sinking into the manual valve block 70, the manual shaft 78 can press the valve body 76 in a direction of separating 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 of separating from the valve seat 79 against the biasing force of the biasing spring 77 and the valve body 76 is in a state of separating from the valve seat 79, the flow of air from the first supply flow path 72 to the second supply flow path 74 via the valve chamber 73 is allowed.

[0078] (Function)

[0079] Next, the function of the present embodiment will be described.

[0080] In the air spray gun 10, when the manual shaft 78 is pressed in a direction of sinking into the manual valve block 70 from a state of projecting from the manual valve block 70, air is intermittently ejected from the ejection port 14.

[0081] Specifically, when the manual shaft 78 is pressed in a direction of sinking into the manual valve block 70, the manual shaft 78 presses the valve body 76 in a direction of separating from the valve seat 79 against the biasing force of the biasing spring 77. Thereby, the valve body 76 is in a state of separating from the valve seat 79, and the air supplied 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.

[0082] AsFigure 2 As shown, the air flowing through the base supply flow path 17a is supplied to the supply port 22 via the first communication hole 27a. And a part of the air supplied to the supply port 22 flows toward the communication port 26 via 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 moves to the first position and the second spool valve 33 moves to the third position, a part of the air supplied to the supply port 22 is output to the first output port 23. And the air output from the supply port 22 to the first output port 23 is ejected to the outside from the ejection port 14 via the first communication hole 28a and the first block communication flow path 16c.

[0083] In addition, a part of the air flowing through the first block communication flow path 16c flows into the inside of the valve fitting recess 16a via the second block communication flow path 16d. The air flowing into the inside of the valve fitting recess 16a flows toward the third block communication flow path 16e through the regulating valve hole 55 and the radial hole 57 of the first regulating valve 51. And the air flowing toward the third block communication flow path 16e flows into the valve fitting hole 19b via the third block communication flow path 16e and the first flow path 19c.

[0084] A part of the air flowing into the valve fitting hole 19b flows toward the first pilot chamber 36 through the radial hole 57 and the regulating valve hole 55 of the second regulating valve 52. In addition, the lip seal 62 of the second regulating valve 52 allows the air flowing into the valve fitting hole 19b from the first flow path 19c to flow toward the first pilot chamber 36 between the outer peripheral surface of the valve sleeve 53 and the inner peripheral surface of the valve fitting hole 19b. Therefore, the remaining air flowing into the valve fitting hole 19b flows toward the first pilot chamber 36 between the outer peripheral surface of the valve sleeve 53 and the inner peripheral surface of the valve fitting hole 19b.

[0085] As Figure 3 shown, the air flowing toward the first pilot chamber 36 is supplied to the first pilot chamber 36 from the valve fitting hole 19b. Thus, air is supplied from the first output port 23 to the first pilot chamber 36 via the first communication flow path 41. Thereby, the first spool valve 32 moves from the first position to the second position. Then, the air flowing from the supply port 22 via the second communication hole 28b, the communication recess 30, and the third communication hole 28c toward the communication port 26 is output to the second output port 24.

[0086] As Figure 4As shown, 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 flow path 17c, and the second flow path 20b. Thus, air is supplied to the second pilot chamber 37 from the second output port 24 via the second communication flow path 42. As a result, the second spool valve 33 moves from the third position to the fourth position. Consequently, the flow of air between the supply port 22 and the first output port 23 is cut off, and the air jet to the outside from the jet outlet 14 is cut off.

[0087] Through the first regulating valve 51, the flow rate of the air supplied from the first output port 23 to the first pilot chamber 36 via the first communication flow path 41 is regulated, so that the time until the first pilot chamber 36 is filled with air is regulated. As a result, the time until the second pilot chamber 37 is filled with air is also regulated. Thus, the jet time of the air jet from the jet outlet 14 to the outside is regulated.

[0088] As Figure 5 shown, when the second spool valve 33 moves to the fourth position, since the flow of air between the supply port 22 and the first output port 23 is cut off, the air is discharged from the first pilot chamber 36 to the outside via the first communication flow path 41 and the jet outlet 14. As a result, the first spool valve 32 moves from the second position to the first position. Then, since the flow of air between the second output port 24 and the discharge port 25 is allowed, the air is discharged from the second pilot chamber 37 to the outside via the second communication flow path 42, the second output port 24, and the discharge port 25. Thus, as Figure 2 shown, the second spool valve 33 moves from the fourth position to the third position. As a result, the flow of air between the supply port 22 and the first output port 23 is allowed, and the air output from the supply port 22 to the first output port 23 is jetted to the outside from the jet outlet 14 via the first communication flow path 41.

[0089] Through the second regulating valve 52, the flow rate of the air discharged from the first pilot chamber 36 to the outside via the first communication flow path 41 and the jet outlet 14 is regulated, so that the time until the air is discharged from the first pilot chamber 36 is regulated. As a result, the time until the air is discharged from the second pilot chamber 37 is also regulated. Thus, the cut-off time for cutting off the air jet from the jet outlet 14 is regulated.

[0090] (Effect)

[0091] The following effects can be obtained in the above-described embodiment.

[0092] (1) The flow rate of the air supplied from the first output port 23 to the first pilot chamber 36 via the first communication flow path 41 is adjusted by the first control valve 51, so that the time until the first pilot chamber 36 is filled with air is adjusted. As a result, the time until the second pilot chamber 37 is filled with air is also adjusted. Thereby, the adjustment of the ejection time of the air ejected from the ejection port 14 to the outside can be performed. In addition, the flow rate of the air discharged from the first pilot chamber 36 to the outside via the first communication flow path 41 and the ejection port 14 is adjusted by the second control valve 52, so that the time until the air is discharged from the first pilot chamber 36 is adjusted. As a result, the time until the air is discharged from the second pilot chamber 37 is also adjusted. Thereby, the adjustment of the cutoff time for cutoff the air ejection from the ejection port 14 can be performed. Through the above, the ejection time of the air ejected from the ejection port 14 and the cutoff time for cutoff the air ejection from the ejection port 14 can be adjusted respectively. Therefore, for example, the ejection time of the air ejected from the ejection port 14 can be extremely shortened, and the cutoff time for cutoff the air ejection from the ejection port 14 can be extremely extended, so that the effective utilization of the air can be easily achieved.

[0093] (2) The first control valve 51 and the second control valve 52 are respectively provided on one surface 131 of the fuselage 13. Thereby, the first control valve 51 and the second control valve 52 can be arranged together on one surface 131 of the fuselage 13. Therefore, when compared with the case where the first control valve 51 and the second control valve 52 are respectively provided on different surfaces of the fuselage 13, for example, the air spray gun 10 can be made more compact.

[0094] (Modification example)

[0095] In addition, the above-described embodiment can be modified as follows. The above-described embodiment and the following modification examples can be implemented by combining them with each other within a technically non-contradictory range.

[0096] · As Figure 6As shown, the first regulating valve 51 and the second regulating valve 52 may not be provided in the first communication flow path 41, but may be respectively provided in the second communication flow path 42. At this time, the first regulating valve 51 regulates the flow rate of the air supplied from the second outlet 24 to the second pilot chamber 37 via the second communication flow path 42. Thereby, since the time until the second pilot chamber 37 is filled with air is regulated, the ejection time of the air ejected from the ejection port 14 to the outside can be regulated. In addition, the second regulating valve 52 regulates the flow rate of the air discharged from the second pilot chamber 37 to the outside via the second communication flow path 42, the second outlet 24, and the discharge port 25. Thereby, since the time until the air is discharged from the second pilot chamber 37 is regulated, the cutoff time for cutoff of the air ejection from the ejection port 14 can be regulated. Through the above, the ejection time of the air ejected from the ejection port 14 and the cutoff time for cutoff of the air ejection from the ejection port 14 can be regulated separately. Therefore, for example, the ejection time of the air ejected from the ejection port 14 can be extremely shortened, and the cutoff time for cutoff of the air ejection from the ejection port 14 can be extremely extended, so that effective utilization of the air can be easily achieved.

[0097] · As Figure 7 shown, the first regulating valve 51 and the second regulating valve 52 may, for example, be respectively provided on different surfaces of the fuselage 13. Or, as long as the first regulating valve 51 and the second regulating valve 52 are respectively provided in any one of the first communication flow path 41 or the second communication flow path 42, the arrangement positions with respect to the fuselage 13 are not particularly limited. For example, it may be that the second regulating valve 52 is provided in the first communication flow path 41 and the first regulating valve 51 is provided in the second communication flow path 42. At this time, the first regulating valve 51 regulates the flow rate of the air supplied from the second outlet 24 to the second pilot chamber 37 via the second communication flow path 42. Thereby, since the time until the second pilot chamber 37 is filled with air is regulated, the ejection time of the air ejected from the ejection port 14 to the outside can be regulated. In addition, at this time, the lip seal 62 of the first regulating valve 51 cuts off the flow of air from the second flow path 20b to the second pilot chamber 37. On the other hand, the lip seal 62 of the first regulating valve 51 allows the flow of air from the second pilot chamber 37 to the second flow path 20b.

[0098] In addition, for example, it may be that the first regulating valve 51 is provided in the first communication flow path 41 and the second regulating valve 52 is provided in the second communication flow path 42. The second regulating valve 52 regulates the flow rate of the air discharged from the second pilot chamber 37 to the outside via the second communication flow path 42, the second outlet 24, and the discharge port 25. Thereby, since the time until the air is discharged from the second pilot chamber 37 is regulated, the cutoff time for cutoff of the air ejection from the ejection port 14 can be regulated.

[0099] · In an embodiment, the communication recess 30 may not be formed on the block surface 161 of the flow path forming block 16. At this time, for example, a through hole that connects the supply port 22 and the communication port 26 to each other may be formed in the wall portion of the housing main body 18 that is located between the supply port 22 and the communication port 26.

[0100] · In an embodiment, the air spray gun 10 may include a solenoid valve portion that electrically controls the opening and closing of the valve body 76 instead of the manual valve portion 12.

[0101] · In an embodiment, the first piston 34 is not limited to a disc shape, and for example, it may be an elliptical plate shape or an oblong plate shape. Alternatively, the shape of the first piston 34 is not particularly limited.

[0102] · In an embodiment, the second piston 35 is not limited to a disc shape, and for example, it may be an elliptical plate shape or an oblong plate shape. Alternatively, the shape of the second piston 35 is not particularly limited.

[0103] · In an embodiment, the outer diameter of the first piston 34 and the outer diameter of the second piston 35 may be different. Therefore, the area of the portion of the first piston 34 that is subjected to the pilot air pressure in the first pilot chamber 36 and the area of the portion of the second piston 35 that is subjected to the pilot air pressure in the second pilot chamber 37 may also be different.

Claims

1. A pulse air generating device that intermittently ejects air from an ejection port provided on a fuselage, wherein the pulse air generating device is characterized by comprising: A valve hole formed in the fuselage; A first slide valve and a second slide valve that are accommodated in the valve hole in a reciprocating movable manner and 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 fuselage and are respectively communicated with the valve hole; A first piston that moves integrally with the first slide valve; A second piston that moves integrally with the second slide valve; A first pilot chamber to which pilot air for moving the first piston is supplied and discharged from the first pilot chamber; A second pilot chamber to which pilot air for moving the second piston is supplied and discharged from the second pilot chamber; A first communication flow path that is connected to the ejection port and communicates the first output port and the first pilot chamber with each other; A second communication flow path that communicates the second output port and the second pilot chamber with each other; A first regulating valve that is provided in the first communication flow path and regulates the flow rate of air supplied from the first output port to the first pilot chamber via the first communication flow path; or is provided in the second communication flow path and regulates the flow rate of air supplied from the second output port to the second pilot chamber via the second communication flow path; And A second regulating valve that is provided in the first communication flow path and regulates the flow rate of air discharged from the first pilot chamber to the outside via the first communication flow path and the ejection port; or is provided in the second communication flow path and regulates the flow rate of air discharged from the second pilot chamber to the outside via the second communication flow path, the second output port, and the discharge port, The first slide valve switches to a first position when air is discharged from the first pilot chamber, and switches to a second position when air is supplied to the first pilot chamber. The first position is a position where the first slide valve blocks the flow of air between the supply port and the second output port and allows the flow of air between the second output port and the discharge port. The second position is a position where the first slide valve allows the flow of air between the supply port and the second output port and blocks the flow of air between the second output port and the discharge port. The second slide valve switches to a third position where the flow of air between the supply port and the first output port is allowed when the first slide valve switches to the first position, and switches to a fourth position where the flow of air between the supply port and the first output port is blocked when the first slide valve switches to the second position.

2. The pulse air generating device according to claim 1, wherein The first regulating valve and the second regulating valve are provided on one surface of the fuselage.

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