TWM615533U - Nozzle head and nozzle - Google Patents

Abstract

A nozzle head (10) is detachably attached to a nozzle tube (12). A head body (58) of the nozzle head (10) includes a proximal head portion (54) and a distal head portion (56). A cylindrical body (60) is disposed inside the proximal head portion (54) to be coaxial to the proximal head portion (54). The distal head portion (56) has discharge orifices (64) discharging fluid inside the proximal head portion (54) and positioned off the central axis (C) of the head body (58). When viewed in the axial direction of the head body (58), an inner space (68) of the cylindrical body (60) overlaps with parts of the discharge orifices (64) adjacent to the radial center of the head body (58), and the inner circumferential edge of the cylindrical body (60) overlaps with parts of the discharge orifices (64) adjacent to the radially outer edge of the head body (58).

Description

Nozzle head and nozzle

This creation is about a nozzle head provided with a plurality of fluid discharge holes and a nozzle with the nozzle head.

For example, there is known a nozzle head that sends out high-pressure fluid such as compressed air to remove oil-containing chips deposited on the workpiece, or water droplets attached to the workpiece. This type of nozzle head is expected to suppress the noise during delivery while maintaining the delivery pressure of the fluid.

Therefore, for example, Japanese Patent Application Laid-Open No. 2004-050122 proposes a nozzle having a nozzle head for suppressing noise and the like, and the nozzle head is provided with a plurality of fluid discharge holes. The nozzle includes a nozzle tube and a nozzle head, and supplies fluid to the nozzle head through the nozzle tube. Each of the plurality of delivery holes is radially arranged on the nozzle head with the center axis of the nozzle tube as the starting point. Furthermore, the mutual inner diameters and axial lengths of the plurality of delivery holes are approximately the same. According to this configuration, since the flow rate of the fluid passing through each of the plurality of delivery holes can be made substantially the same as each other, and the fluid can be rectified in each delivery hole, control such as noise suppression can be performed.

However, in the past, there has not been a proposal to fully maintain the delivery pressure of the fluid delivered from the delivery hole while suppressing the noise during delivery.

This creation is based on the above circumstances, and aims to provide a nozzle head and nozzle that can maintain the delivery pressure of the fluid delivered from the delivery hole while suppressing noise during delivery.

One form of this creation is a nozzle head that is installed in the fluid delivery part in a detachable manner. The nozzle head has: a head body with a hollow head base end and a head front end. The base end of the head allows fluid to flow in from one end side in the axial direction through the aforementioned fluid delivery portion, and the front end of the head blocks the other end of the base end in the axial direction; and the cylindrical body is attached to the aforementioned The interior of the base end of the head is arranged coaxially with the base end of the head, and an inner space is provided on the center side in the radial direction; A plurality of delivery holes for fluid delivery are arranged at the front end of the head in a manner that is offset from the central axis of the head body; viewed from the axial direction of the head body, the inner space is in each of the plurality of delivery holes The radial center side of the head body overlaps; from the axial view of the head body, the inner peripheral edge of the cylindrical body overlaps the radial outer side of the head body in each of the plurality of delivery holes.

Another type of this creation is a nozzle, which is provided with: the above-mentioned nozzle head; and a nozzle tube, which can be installed in a freely detachable manner.

In this nozzle head, when viewed from the axial direction, each of the plurality of delivery holes is arranged so as to be offset from the central axis of the head body. The flow velocity of the fluid flowing into the inside of the base end of the head through the fluid sending portion is the largest on the central axis side of the head body. Therefore, by discharging fluid from each of the plurality of discharging holes arranged so as to be shifted from the central axis of the head body, the discharging pressure of the fluid can be maintained and noise during discharging can be suppressed.

Furthermore, in this nozzle head, a cylindrical body is provided inside the base end of the head. In this way, viewed from the axial direction of the head body, the inner space of the cylindrical body overlaps with the radial center side of the head body in each of the plurality of delivery holes. Viewed from the axial direction of the aforementioned head body, the inner peripheral edge of the cylindrical body overlaps with the radially outer side of the head body of each of the plurality of delivery holes. By setting the arrangement of the delivery hole and the cylindrical body in this way, it is also possible to suppress noise during delivery while maintaining the delivery pressure of the fluid.

From the description of the following preferred embodiment examples which are referenced together with the accompanying drawings, the above-mentioned objects, features, and advantages can be more clearly understood.

10: Nozzle head

12: Nozzle tube

12a: Front face

14: Nozzle

16: gun body

18: Blow gun

20: Shell

22: pressure bar

24: handle

26: Supply port

28: Send out

30: The first joint part

32: The second joint part

34: Connector body 3

36: Joint nut

38: sleeve

40: Small inner diameter

42: Large inner diameter part

44: step difference

46: Cone surface

48: male thread

50: Female thread

52: step part

54: head base

56: The front part of the head

58: head body

60: Cylinder

60a: Base end face

62: Connection

64: Send out

66: Cone

68: inner space

70: Joint nut

72: sleeve

74: Cone surface

76: male thread

78: Female thread

80: step part

C: Central axis

D1, D3: inner diameter

D2: Diameter

L: length

Figure 1 is an exploded partial cross-sectional view of an air blow gun equipped with a nozzle of the implementation type of this creation.

Figure 2 is a cross-sectional view of the nozzle head installed in the nozzle tube.

Figure 3 is an oblique view of the nozzle head.

Fig. 4 is an explanatory diagram of the nozzle head viewed in the axial direction from the tip end side.

A number of preferred implementation modes are listed below, and the nozzle head and nozzle of this creation will be described with reference to the attached drawings.

As shown in FIG. 1 and FIG. 2, the nozzle head 10 of the embodiment of the present creation is detachably mounted on the nozzle tube 12 (fluid delivery part) to form the nozzle 14. As shown in FIG. 1, the nozzle 14 is preferably configured to form an air blow gun 18 together with the gun body 16, and is mounted on the gun body in a freely detachable manner. 16. Therefore, in the following description, a case where the nozzle 14 is provided in the air blow gun 18 and sends out compressed air (high-pressure air) as a fluid is taken as an example. However, the nozzle 14 is not particularly limited to the above-mentioned use, and can be installed in various devices to send out various fluids.

The gun body 16 can adopt, for example, a well-known structure disclosed in International Publication No. 2019/073834. Therefore, the following needles will only describe the outline structure of the gun body 16 as an example. As shown in FIG. 1, the gun body 16 has a gun-shaped housing part 20 and a pressing rod 22 rotatably attached to the housing part 20.

The housing part 20 has a handle 24 for an operator to hold, a supply port 26 for supplying compressed air from a compressed air supply source (not shown), and a delivery port 28 for installing the nozzle 14. In addition, although not shown, a gun flow path that communicates the supply port 26 with the delivery port 28 and a valve portion that opens and closes the gun flow path are provided in the housing portion 20. The valve part is opened and closed in conjunction with the rotation of the pressure lever 22. For example, when the pressing rod 22 is rotated to the side close to the handle 24, the valve part is in an open state. Furthermore, when the pressing rod 22 is rotated to the side separated from the handle 24, it is in a closed state.

Therefore, when the operator grasps the handle 24 and the press rod 22, the supply port 26 and the delivery port 28 are communicated via the gun flow path, and compressed air flows into the nozzle 14 from the delivery port 28. On the other hand, when the operator releases the hold lever 22, the supply port 26 and the delivery port 28 are blocked, and the compressed air from the delivery port 28 is stopped from flowing into the nozzle 14. In addition, in the following description, the upstream side of the compressed air sent from the delivery port 28 is also referred to as the proximal side (arrow X1 side in FIG. 1), and the downstream side is also referred to as the front end side (arrow X1 in FIG. X2 direction).

The nozzle 14 includes a nozzle tube 12, a first joint portion 30 that fixes the base end side of the nozzle tube 12 to the delivery port 28 of the gun body 16, and is detachably attached to the nozzle via a second joint portion 32. The nozzle head 10 on the front end side of the tube 12. The nozzle tube 12 is a round tube in which a nozzle tube flow path is formed. The nozzle pipe flow path allows compressed air to flow in from the delivery port 28 through the first joint portion 30, and the compressed air Guide to the nozzle head 10. In this embodiment, the inner diameter D1 (FIG. 2) of the nozzle tube 12 is the same diameter in the axial direction. Furthermore, the inner diameter D1 of the nozzle tube 12 is not particularly limited, but is preferably set to, for example, 9.0 to 11.0 mm.

The first joint portion 30 has a hollow shape that allows the delivery port 28 to communicate with the nozzle tube flow path, and has a joint body 34, a joint nut 36 and a sleeve 38. The small inner diameter portion 40 of the joint body 34 is provided on the base end side, and the large inner diameter portion 42 having an inner diameter larger than the inner diameter of the small inner diameter portion 40 is provided on the tip side. The small inner diameter portion 40 is screwed to the delivery port 28. In addition, the base end side of the nozzle tube 12 is inserted into the large inner diameter portion 42. In this case, the base end surface of the nozzle tube 12 can abut the step 44 caused by the difference in the inner diameter between the small inner diameter portion 40 and the large inner diameter portion 42.

The inner diameter of a part of the front end side of the large inner diameter portion 42 decreases in diameter from the front end toward the base end side. That is, a tapered surface 46 is provided on the inner periphery of the front end side of the large inner diameter portion 42, and the tapered surface 46 approaches the nozzle tube 12 from the front end of the large inner diameter portion 42 toward the base end side. The direction of the outer peripheral surface is inclined. Therefore, a gap is formed between the tapered surface 46 and the outer peripheral surface of the nozzle tube 12. A male screw 48 is formed on the outer peripheral surface of the front end side of the large inner diameter portion 42.

The nozzle tube 12 is inserted into the inner side of the sleeve 38. The sleeve 38 inserted through the nozzle tube 12 in this way is inserted into the engagement nut 36 again. A female screw 50 screwed to the male screw 48 of the large inner diameter portion 42 is formed on the inner periphery other than the front end side of the engagement nut 36. Furthermore, on the inner peripheral side of the front end of the engagement nut 36, a stepped portion 52 that abuts against the front end surface of the sleeve 38 is formed. The base end side of the sleeve 38 can be inserted into the gap between the tapered surface 46 and the outer peripheral surface of the nozzle tube 12.

In other words, in the first joint portion 30, the male thread 48 of the joint body 34 and the female thread 50 of the joint nut 36 are screwed in a state where the nozzle tube 12 is inserted into the joint body 34, the sleeve 38, and the joint nut 36. combine. When the coupling nut 36 and the joint body 34 are approached in the axial direction by this screwing, the sleeve 38 abutting on the step portion 52 of the coupling nut 36 is pushed toward the base end side. Thereby, the base end side of the sleeve 38 gradually enters between the tapered surface 46 and the outer peripheral surface of the nozzle tube 12.

In other words, the more the male screw 48 and the female screw 50 are screwed together, the more the base end side of the sleeve 38 enters between the tapered surface 46 and the outer peripheral surface of the nozzle tube 12. Therefore, the locking force acting on the nozzle tube 12 via the engagement nut 36, the joint body 34, and the sleeve 38 can be increased. As a result, with the first joint portion 30, the nozzle tube 12 can be simply and firmly fixed to the delivery port 28 of the gun body 16.

Furthermore, by loosening the threaded engagement of the male thread 48 of the joint body 34 and the female thread 50 of the joint nut 36, it is possible to reduce the effect of the joint nut 36, the joint body 34, and the sleeve 38 on the nozzle tube. Locking force of 12. Therefore, the nozzle tube 12 can be detached from the delivery port 28 of the gun body 16. In addition, the first joint portion 30 may be configured to fix the nozzle tube 12 to the delivery port 28 of the gun body 16, and is not limited to having the above-mentioned joint body 34, sleeve 38, and coupling screw. 36 people with caps.

As shown in FIGS. 1 and 2, the nozzle head 10 includes a head main body 58 and a cylindrical body 60, and the head main body 58 includes a head base end portion 54 and a head tip end portion 56. In the present embodiment, the base end 54 and the front end 56 of the head are integrally formed of the same material, but they are not particularly limited to this. The head base end 54 has a hollow shape into which compressed air can flow through the nozzle tube 12. Furthermore, in this embodiment, a connecting portion 62 constituting the second joint portion 32 is provided on the proximal side of the head base end portion 54, and the connection portion 62 of the head base end portion 54 can be connected via the second joint portion 32. The base end side and the tip side of the nozzle tube 12 are connected. The details of the connecting portion 62 will be described later.

The head tip portion 56 blocks the tip side of the head base end portion 54. As shown in FIG. 2, a plurality of delivery ports 64 that penetrate the head tip portion 56 in the axial direction to send out the fluid inside the head base portion 54 are arranged in the head so as to be offset from the central axis C of the head body 58 Front end 56. In this embodiment, as shown in FIG. 4, three delivery ports 64 are provided in the head front end portion 56 with intervals in the circumferential direction of the head front end portion 56.

Furthermore, as shown in FIG. 2, the head body 58 has a tapered portion 66 whose diameter is enlarged from the tip of the head tip portion 56 toward the head base end portion 54 side. Therefore, in the front end portion 56 of the head, the axial direction of the inner wall of the delivery port 64 is formed The length of is shorter on the radial outer side than on the radial center side of the head body 58. The shortest length L in the axial direction of the inner wall of the delivery port 64 is not particularly limited, but is preferably 4.0 to 6.0 mm. In addition, the head body 58 may not have the tapered portion 66, but the outer diameter of the head tip portion 56 and the outer diameter of the head base end 54 are the same in the axial direction. The diameter D2 of each of the plurality of delivery ports 64 is not particularly limited, but is preferably 3.0 to 5.0 mm.

The cylindrical body 60 is arranged inside the head base end 54 so as to be coaxial with the head base end 54. The cylindrical body 60 is formed into a cylindrical shape from, for example, a porous material. Therefore, an inner space 68 is provided on the radial center side of the cylindrical body 60. The inner diameter D3 of the cylindrical body 60 is not particularly limited, but is preferably 6.0 to 9.0 mm.

A)」，平均氣孔徑80至200μm)等，然而並不特別地限定於此。再者，圓筒體60也可由多孔質材料以外的材料形成圓筒形。 In addition, as a porous material forming the cylindrical body 60, a poly(vinyl formal) resin (for example, a product manufactured by Aion Co., Ltd.) can be mentioned. Name "Bell eater A (bell eater A;

A)”, the average pore size is 80 to 200 μm), etc., but it is not particularly limited to this. In addition, the cylindrical body 60 may be formed into a cylindrical shape by a material other than a porous material.

In this embodiment, the cylindrical body 60 arranged inside the head base end 54 is replaceable. As described above, the nozzle head 10 is attached to the nozzle tube 12 in a detachable manner. As shown in FIG. 1, in a state where the nozzle head 10 is detached from the nozzle tube 12, the base end side of the head base end portion 54 is opened to the outside. Therefore, through the opening on the proximal side of the head proximal portion 54, the cylindrical body 60 can be inserted into and taken out of the head proximal portion 54.

That is, in the nozzle head 10, for example, by preparing a plurality of cylindrical bodies 60 having different average pore diameters or inner diameters D3 from each other, the cylindrical bodies 60 can be selectively arranged from the plurality of cylindrical bodies 60. In the inside of the base end 54 of the head.

As shown in FIG. 4, in a state where the cylindrical body 60 is arranged inside the head base end portion 54, the positional relationship between the cylindrical body 60 and the plurality of delivery ports 64 viewed from the axial direction of the head body 58 is as follows The way set up. That is, the inner space 68 of the cylindrical body 60 overlaps with the radial center side of the head body 58 in each of the plurality of delivery ports 64. Furthermore, the inner peripheral edge of the cylindrical body 60 overlaps with the radially outer side of the head body 58 in each of the plurality of delivery ports 64. In addition, the outer peripheral edge portion of the cylindrical body 60 is arranged closer to the radially outer side of the head body 58 than each of the plurality of delivery ports 64. In addition, the outer peripheral edge portion of the cylindrical body 60 may be arranged at the same position as the radially outer edge portion of the head body 58 in each of the plurality of delivery ports 64, or may overlap with each of the plurality of delivery ports 64. Mode configuration.

As shown in FIG. 2, the second joint portion 32 has a connecting portion 62, an engagement nut 70 and a sleeve 72. The connecting portion 62 has an annular shape that protrudes in the axial direction from the base end of the head base end portion 54. The tip side of the nozzle tube 12 is inserted into the inside of the connecting portion 62 and a part of the base end side of the head base end 54. In this case, the front end surface 12 a of the nozzle tube 12 abuts the base end surface 60 a of the cylindrical body 60.

The inner diameter of a part of the base end side of the connecting portion 62 decreases in diameter from the base end to the distal end side. That is, a tapered surface 74 is provided on the inner periphery of the base end side of the connecting portion 62, and the tapered surface 74 is in a direction approaching the outer peripheral surface of the nozzle tube 12 from the base end of the connecting portion 62 to the tip side. tilt. Therefore, a gap is formed between the tapered surface 74 and the outer peripheral surface of the nozzle tube 12. A male screw 76 is formed on the outer peripheral surface of the base end side of the connecting portion 62.

The nozzle tube 12 is inserted through the inside of the sleeve 72. The sleeve 72 inserted through the nozzle tube 12 in this manner is inserted into the engagement nut 70 again. A female screw 78 screwed with the male screw 76 of the connecting portion 62 is formed on the inner periphery other than the base end side of the engagement nut 70. Furthermore, on the inner peripheral side of the base end of the engagement nut 70, a step portion 80 that abuts against the base end surface of the sleeve 72 is formed. The tip side of the sleeve 72 can be inserted into the gap between the tapered surface 74 and the outer circumferential surface of the nozzle tube 12.

In other words, the second joint portion 32 is basically configured in the same manner as the first joint portion 30. In the second joint portion 32, the nozzle tube 12 is inserted into the connection portion 62, the sleeve 72, and the joint nut 70. The male thread 76 of the connecting portion 62 is screwed with the female thread 78 of the engagement nut 70. When the engagement nut 70 and the connecting portion 62 are approached in the axial direction by this screwing, the sleeve 72 abutting on the step portion 80 of the engagement nut 70 is pushed toward the front end side. Thereby, the front end side of the sleeve 72 gradually enters between the tapered surface 74 and the outer peripheral surface of the nozzle tube 12.

In other words, the more the male screw 76 and the female screw 78 are screwed together, the more the front end side of the sleeve 72 enters between the tapered surface 74 and the outer peripheral surface of the nozzle tube 12. Therefore, the locking force acting on the nozzle tube 12 via the engagement nut 70, the connecting portion 62, and the sleeve 72 can be increased. As a result, with the second joint portion 32, the nozzle head 10 can be simply and firmly fixed to the tip of the nozzle tube 12.

Furthermore, by loosening the threaded engagement of the male thread 76 of the connecting portion 62 and the female thread 78 of the engaging nut 70, it is possible to reduce the effect of the engaging nut 70, the connecting portion 62, and the sleeve 72 on the nozzle tube. Locking force of 12. Therefore, the nozzle head 10 can be detached from the nozzle tube 12. In addition, the configuration in which the nozzle head 10 is freely attachable to and detachable from the nozzle tube 12 is not limited to the above-mentioned second joint portion 32, and a known connection structure can be adopted.

The nozzle head 10 and nozzle 14 of this embodiment are basically constructed as described above. In the case where compressed air is sent from the nozzle head 10 by the air blowing gun 18 of FIG. 1, the nozzle tube 12 is installed in the sending port 28 of the gun body 16, and the nozzle head 10 is installed in the nozzle tube 12. In this way, when the operator grips the handle 24 and grips the pressing rod 22, the compressed air flows from the delivery port 28 through the nozzle tube 12 into the inside of the head base end 54. The compressed air flowing into the inside of the base end 54 of the head passes through the inner space 68 of the cylindrical body 60 and the pores of the cylindrical body 60, and then is sent out from the plurality of delivery ports 64, respectively.

In the case where the delivery of compressed air from the plurality of delivery ports 64 is stopped, the operator releases the holding lever 22. Thereby, since the inflow of compressed air from the delivery port 28 to the inside of the head base end 54 via the nozzle tube 12 is stopped, the delivery of compressed air from the delivery port 64 is also stopped.

According to the above description, in the nozzle head 10 and the nozzle 14 of this embodiment, each of the plurality of delivery ports 64 is arranged to be offset from the central axis C of the head body 58. The flow rate of the compressed air flowing into the inside of the head base end 54 through the nozzle tube 12 is the largest on the central axis C side of the head body 58. Therefore, by sending compressed air from each of the plurality of delivery ports 64 arranged to be shifted from the central axis C of the head body 58, the delivery pressure of the compressed air can be maintained and noise during delivery can be suppressed.

Furthermore, in the nozzle head 10 and the nozzle 14, a cylindrical body 60 is provided inside the base end 54 of the head. In this way, viewed from the axial direction of the head body 58, the inner space 68 of the cylindrical body 60 overlaps with the radial center side of the head body 58 in each of the plurality of delivery ports 64. Viewed from the axial direction of the head body 58, the inner peripheral edge of the cylindrical body 60 overlaps the radially outer side of the head body 58 among the plurality of delivery ports 64. By setting the arrangement of the delivery port 64 and the cylindrical body 60 in this way, it is also possible to suppress the noise during delivery while maintaining the delivery pressure of the compressed air.

Therefore, according to the nozzle head 10 and the nozzle 14 of the present embodiment, it is possible to suppress noise during delivery while maintaining the delivery pressure of the compressed air (fluid) delivered from the delivery port 64.

In the nozzle head 10 of the above embodiment, the cylindrical body 60 is formed of a porous material. In this case, by being configured so that compressed air can pass through the inside of the pores of the cylindrical body 60, it is possible to further effectively maintain the delivery pressure of the compressed air while suppressing noise during delivery.

In the nozzle head 10 of the above-mentioned embodiment, the cylindrical body 60 is arranged in the inside of the head base end 54 in a replaceable manner. In this case, for example, a plurality of cylinders 60 having different workloads (impact force) or noise levels determined based on the delivery pressure and delivery flow rate of the compressed air from the delivery port 64 are prepared. In this way, by replacing the cylindrical body 60 according to the use environment or purpose of the air blow gun 18, the size of the workload and the noise level can be adjusted. That is, the versatility of the nozzle head 10 can be improved with a simple configuration.

In the nozzle head 10 of the above-mentioned embodiment, three delivery ports 64 are provided in the head tip portion 56 at intervals in the circumferential direction of the head tip portion 56.

In the nozzle head 10 of the above-mentioned embodiment, the head body 58 has a tapered portion 66 whose diameter is enlarged from the head tip portion 56 toward the head base end portion 54 side.

In the nozzle head 10 of the aforementioned embodiment, the shortest axial length L of the inner wall of the delivery port 64 is 4.0 to 6.0 mm.

In the nozzle head 10 of the aforementioned embodiment, the inner diameter D3 of the cylindrical body 60 is 6.0 to 9.0 mm, and the diameter D2 of each of the plurality of delivery ports 64 is 3.0 to 5.0 mm.

In the nozzle head 10 of the above-mentioned embodiment, viewed from the axial direction of the head body 58, the outer peripheral edge of the cylindrical body 60 is arranged closer to the radially outer side of the head body 58 than each of the plurality of delivery ports 64.

In this case, the effective cross-sectional area of each delivery port 64 can be ensured well, and the compressed air can be delivered efficiently. Furthermore, it is possible to further effectively suppress the noise during the delivery while maintaining the delivery pressure of the compressed air.

The nozzle head 10 and the nozzle 14 of the present invention are not limited to the above-mentioned implementation types, and of course various configurations can be adopted without departing from the spirit of the present invention.

For example, the nozzle head 10 of the aforementioned embodiment is attached to the nozzle tube 12 in a detachable manner, but it is not particularly limited to this. The nozzle head 10 may be directly attached to the delivery port 28 (fluid delivery part) of the gun body 16 in a detachable manner without passing through the nozzle tube 12.

10: Nozzle head

32: The second joint part

56: The front part of the head

58: head body

60: Cylinder

64: Send out

66: Cone

68: inner space

70: Joint nut

C: Central axis

D2: Diameter

D3: inner diameter

Claims (10)

A nozzle head (10) is installed in a fluid delivery part in a freely detachable manner, and the nozzle head is provided with: The head body (58) has a hollow head base end portion (54) and a head tip end portion (56). The head base end portion allows fluid to flow in from one end side in the axial direction through the fluid delivery portion. The front end blocks the other end side of the base end of the head in the axial direction; and The cylindrical body (60) is arranged inside the base end of the head so as to be coaxial with the base end of the head, and an inner space (68) is provided on the radial center side; and, A plurality of delivery holes (64) that penetrate the head end portion in the axial direction and send out the fluid inside the head base end portion are arranged in the head end so as to be offset from the central axis (C) of the head body Department; Viewed from the axial direction of the head body, the inner space overlaps the radial center side of the head body in each of the plurality of delivery holes; Viewed from the axial direction of the head body, the inner peripheral edge of the cylindrical body overlaps the radially outer side of the head body in each of the plurality of delivery holes. The nozzle head according to claim 1, wherein the cylindrical system is formed of a porous material. The nozzle head according to claim 1, wherein the cylindrical system is replaceably arranged inside the base end of the head. The nozzle head according to claim 1, wherein the tip of the head is provided with three delivery holes at intervals in the circumferential direction of the tip of the head. The nozzle head according to claim 1, wherein the head body system has a tapered portion (66) whose diameter is enlarged from the front end portion of the head toward the base end side of the head. The nozzle head according to claim 1, wherein the shortest axial length of the inner wall of the delivery port is 4.0 to 6.0 mm. The nozzle head according to claim 1, wherein the inner diameter of the cylindrical body is 6.0 to 9.0 mm, and the diameter of each of the plurality of delivery ports is 3.0 to 5.0 mm. The nozzle head according to claim 1, wherein, viewed from the axial direction of the head body, the outer periphery of the cylindrical body is arranged on the radially outer side of the head body than each of the plurality of delivery ports . A nozzle (14) equipped with: The nozzle head (10) according to any one of claims 1 to 8; and The nozzle tube (12) is for the nozzle head to be installed in a freely detachable manner. The nozzle according to claim 9, wherein the nozzle tube is installed in the gun body (16) of the air blowing gun (18).

Images