Blast Gun

Abstract

To provide a blast gun 1 which performs blast processing to a processed surface in a narrow part while inhibiting wear of a circulation portion of a blast medium BM.SOLUTION: A blast gun 1 includes: a first straight pipe part 10 including a medium passage 20 in which a blast medium BM is circulated and an air passage 21 in which compressed air CA is circulated; a second straight pipe part 11 including a jet passage 22 which allows the blast medium BM sent from the first straight pipe part 10 to circulate and guides the blast medium BM to a jet port; a curve pipe part 12 which connects the first straight pipe part 10 with the second straight pipe part 11 and includes a communication passage 24 allowing communication between the medium passage 20 and the jet passage 22; and a suction part 40 which is formed at a part of a portion formed by the first straight pipe part 10, the second straight pipe part 11, and the curved pipe part 12 and in which the blast medium BM is suctioned from the medium passage 20 and sent by the compressed air CA circulating in the air passage 21. A suction area 43 in which the compressed air CA suctions the blast medium BM is located in the jet passage 22.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present disclosure relates to a blast gun. [Background technology]

[0002] Conventionally, there is a blasting device that performs blasting on a workpiece. The blasting device is equipped with a blasting gun that uses compressed air to inject blasting media such as abrasive grains onto the workpiece. Patent Document 1 discloses a technology related to a blasting gun that includes a conduit for introducing compressed air into the main body, a blasting material supply tube for introducing blasting material (blasting media) into the main body, and an injection nozzle. Here, the extension directions of the compressed air conduit and the injection nozzle are on a straight line along the extension direction of the main body. Meanwhile, the blasting material supply tube is connected to the side of the main body so that the extension direction of the blasting material supply tube is perpendicular to the extension direction of the main body. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2002-187069 A Summary of the Invention [Problem to be solved by the invention]

[0004] In the blast gun disclosed in Patent Document 1, the extension direction of the compressed air conduit is parallel to the extension direction of the main body, but the extension direction of the blast material supply tube is different from the extension direction of the main body. Therefore, for example, when the surface to be processed is in a narrowed portion of the workpiece, at least one of the compressed air conduit and the blast material supply tube may interfere with the workpiece, making it possible that the operator cannot move the injection nozzle to the desired position near the surface to be processed.

[0005] In response to this, in order to deal with the case where the surface to be processed is in a narrowed portion, it is possible to use a bent nozzle having a partially bent shape as an alternative to the injection nozzle in the blast gun disclosed in Patent Document 1. With a blast gun connected to a bent nozzle, an operator may be able to perform blast injection while inserting the bent nozzle into the narrowed portion of the workpiece, thereby making it possible to perform blast processing on the surface to be processed that is in the narrowed portion. However, when a bent nozzle is used, the blast media sucked in by compressed air within the main body is forcefully blown onto the curved surface inside the bent nozzle, which is prone to wear. In other words, there is a risk that the injection nozzle will need to be replaced more frequently, which is undesirable from the standpoint of the number of steps required for the replacement work and the increase in the manufacturing cost of the injection nozzle.

[0006] Therefore, an object of the present disclosure is to provide a blast gun that performs blast processing on a workpiece surface located in a narrowed section while suppressing wear on the portion through which the blast media flows. [Means for solving the problem]

[0007] One aspect of the present disclosure is a blast gun that sprays blast media using compressed air, comprising: a first straight pipe section including a media flow path for circulating the blast media and an air flow path for circulating the compressed air; a second straight pipe section including an ejection flow path for circulating the blast media sent out from the first straight pipe section and directing it to an ejection port; a curved pipe section that connects the first straight pipe section and the second straight pipe section and includes a communication flow path that communicates the media flow path and the ejection flow path; No. and a suction section formed in a part of the section consisting of the straight pipe section and the curved pipe section, which sucks in and sends out the blast media from the media flow path by compressed air that has flowed through the air flow path, the suction area where the compressed air sucks in the blast media is located in the injection flow path, The suction section has a divergent nozzle continuous with the communicating flow path, and an air nozzle continuous with the air flow path and formed by a plurality of holes provided in the outer peripheral region of the outlet of the divergent nozzle, and the outlet of the divergent nozzle and the air nozzle are open in the extension direction of the injection flow path.

[0008] In the above blast gun, the media flow path and the air flow path may extend in parallel to each other along the extension direction of the first straight pipe portion in at least a part of the first straight pipe portion. The first straight pipe portion may have an air inlet for introducing compressed air from the outside to the upstream side of the air flow path, and a media inlet for introducing blast media from the outside to the upstream side of the media flow path, the air inlet being provided in a side wall of the first straight pipe portion, and the media inlet being provided at an end of the first straight pipe portion opposite to the side connected to the curved pipe portion. Ma In addition, the first straight pipe section, the second straight pipe section and the curved pipe section may be integrally molded by three-dimensional additive manufacturing. Effect of the Invention

[0009] According to the present disclosure, it is possible to provide a blast gun that performs blast processing on a workpiece surface located in a narrowed section while suppressing wear on the portion through which the blast media flows. [Brief description of the drawings]

[0010] [Figure 1] FIG. 1 is a perspective view of a blast gun according to a first embodiment. [Diagram 2] FIG. 1 is a cross-sectional view of a blast gun according to a first embodiment. [Diagram 3] FIG. 11 is a perspective view of a blast gun according to a second embodiment. [Figure 4] FIG. 11 is a front view of a blast gun according to a second embodiment. [Diagram 5] FIG. 11 is a cross-sectional view of a blast gun according to a second embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0011] Hereinafter, some exemplary embodiments will be described with reference to the drawings. Here, the dimensions, materials, and other specific numerical values ​​shown in each embodiment are merely examples and do not limit the present disclosure unless otherwise specified. In addition, elements having substantially the same functions and configurations are given the same reference numerals to avoid repeated explanations, and elements not directly related to the present disclosure are not illustrated.

[0012] (First embodiment) FIG. 1 is a perspective view of a blast gun 1 according to the first embodiment. The blast gun 1 is provided in a blasting device that performs blast processing on a workpiece, and uses compressed air CA to spray blast media BM such as abrasive grains onto the workpiece. During blast processing, an operator holds the blast gun 1 in one hand, directs the nozzle 32 of the blast gun 1 toward the workpiece surface on the workpiece, and sprays the blast media BM from the nozzle 32. Alternatively, the blast gun 1 may be held by a robot equipped with, for example, multiple movable arms, and automatically moves to the vicinity of the workpiece surface to spray the blast media BM. Note that the components of the blasting device other than the blast gun 1 may be the same as the components of a general blasting device, and therefore illustrations and detailed descriptions are omitted.

[0013] The blast gun 1 has a main body including a first straight pipe section 10, a second straight pipe section 11, and a curved pipe section 12. In this embodiment, the first straight pipe section 10, the second straight pipe section 11, and the curved pipe section 12 are integral with one another. The blast gun 1 may also include a grip section 13 that an operator holds when holding the blast gun 1. The blast gun 1 may also include an adapter section 14 for connecting an air supply tube that supplies compressed air CA from the outside to the first straight pipe section 10.

[0014] Fig. 2 is a cross-sectional view of the blast gun 1. The cut surface in Fig. 2 is along a plane defined by the extension direction of the main body and the direction in which a media flow path 20 and an air flow path 21, which will be described later, face each other.

[0015] The first straight pipe section 10 extends in the extension direction D1 in the figure, and is a major part of the parts constituting the main body. The first straight pipe section 10 includes a media flow path 20 and an air flow path 21 inside. The media flow path 20 distributes the blasting media BM introduced from the outside. The air flow path 21 distributes the compressed air CA introduced from the outside. In this embodiment, the media flow path 20 and the air flow path 21 extend along the extension direction D1 of the first straight pipe section 10. Furthermore, the media flow path 20 and the air flow path 21 are parallel to each other in at least a part of the first straight pipe section 10.

[0016] Here, since the air flow path 21 is a flow path for circulating the compressed air CA, the diameter of the air flow path 21 may be smaller than the diameter of the media flow path 20. Furthermore, the cross-sectional shape of each of the media flow path 20 and the air flow path 21 does not necessarily have to be circular, and may be elliptical or the like. For example, when the cross-sectional shape of the media flow path 20 is circular, the cross-sectional shape of the air flow path 21 may be crescent-shaped and the air flow path 21 may be arranged so that the concave side of the crescent faces the media flow path 20, thereby making the cross-sectional shape of the first straight pipe section 10 more compact.

[0017] The first straight pipe section 10 also has a media inlet 30 for introducing blast media BM from the outside into the media flow path 20. The media inlet 30 is provided at one of the two end portions of the first straight pipe section 10, the end portion 10b opposite to the end connected to the curved pipe section 12. In this case, the media flow path 20 passes through the first straight pipe section 10 along the extension direction D1.

[0018] Here, in this embodiment, the grip portion 13 is connected to the first straight pipe portion 10. The grip portion 13 is a cylindrical body having a through passage 25 therein. The extension direction of the grip portion 13 is along the extension direction D1 of the first straight pipe portion 10. In this case, the grip portion 13 is connected in series to the first straight pipe portion 10 so that one opening 33 of the through passage 25 faces the media inlet 30 and the central axis of the through passage 25 and the central axis of the media flow path 20 are coaxial. Therefore, when the blast media BM is introduced from the outside to the other opening 34 of the through passage 25, the blast media BM flows through the through passage 25 and is introduced into the media flow path 20. The grip portion 13 may be manufactured separately from the main body portion having the first straight pipe portion 10 and the like, and may be finally connected to the main body portion, or may be integrated with the main body portion in advance.

[0019] Furthermore, the first straight pipe section 10 has an air inlet 31 that introduces compressed air CA from the outside into the air flow path 21. The air inlet 31 is provided in the side wall 10a of the first straight pipe section 10 so as to be continuous with the upstream end of the air flow path 21.

[0020] Here, in this embodiment, the adaptor part 14 is connected to the first straight pipe part 10. The adaptor part 14 is a cylindrical body having a through passage 26 inside. The extension direction of the adaptor part 14 is perpendicular to the extension direction D1 of the first straight pipe part 10. In this case, the adaptor part 14 is connected to the first straight pipe part 10 from the side direction by fixing the tip part of the adaptor part 14 to the air inlet 31 so that one opening 35 of the through passage 26 is opened at the upstream end of the air flow path 21. Therefore, when compressed air CA is introduced from the outside to the other opening 36 of the through passage 26, the compressed air CA flows through the through passage 26 and is introduced into the air flow path 21. The adaptor part 14 may be manufactured separately from the main body part having the first straight pipe part 10 and the like, and may be finally connected to the main body part, or may be integrated with the main body part in advance.

[0021] The second straight pipe section 11 extends in the extension direction D2 in the figure, and is the tip of the portion constituting the main body. The second straight pipe section 11 includes an ejection flow path 22 therein that circulates the blasting media BM sent out from the first straight pipe section 10 and guides it to the ejection port 32. The extension direction of the ejection flow path 22 is along the extension direction D2 of the second straight pipe section 11. In this embodiment, the diameter of the ejection flow path 22 is set to be the same as the diameter of the media flow path 20.

[0022] The curved pipe section 12 connects the first straight pipe section 10 and the second straight pipe section 11. The curved pipe section 12 includes a communication flow path 24 that connects the media flow path 20 in the first straight pipe section 10 and the ejection flow path 22 in the second straight pipe section 11. In other words, the blasting media BM that has flowed through the media flow path 20 is guided to the ejection flow path 22 through the communication flow path 24, and is finally discharged to the outside from the ejection port 32. In this embodiment, the diameter of the communication flow path 24 is set to be the same as the diameters of the media flow path 20 and the ejection flow path 22, except for the portion where the suction section 40 described later is formed. The first straight pipe section 10 and the second straight pipe section 11 are connected via the curved pipe section 12, so that the extension direction D2 of the second straight pipe section 11 and the ejection flow path 22 is inclined by a first angle θ1 with respect to the extension direction D1 of the first straight pipe section 10 and the media flow path 20. The first angle θ1 is in the range of 1° to 90°.

[0023] The blast gun 1 also has a suction section 40 that sucks and sends out the blast media BM from the media flow path 20 by the compressed air CA that has flowed through the air flow path 21. In this embodiment, the suction section 40 is formed in a part of the area formed by the first straight pipe section 10 and the curved pipe section 12. The suction section 40 has an air nozzle 41 that is continuous with the air flow path 21, and a media circulation space 42 that is continuous with the media flow path 20. In this case, the extension direction of the nozzle flow path 41a in the air nozzle 41 is along the extension direction D2 of the jet flow path 22. The upstream end of the nozzle flow path 41a is continuous with the downstream end of the air flow path 21. On the other hand, the downstream end of the nozzle flow path 41a is the tip opening 41b of the air nozzle 41. The tip opening 41b protrudes into the communication flow path 24 so that the outer circumferential area of ​​the tip opening 41b becomes the media circulation space 42, and opens in the extension direction D2 of the jet flow path 22. Here, a suction area 43 where the compressed air CA sucks the blasting media BM is located in the ejection flow path 22 .

[0024] Next, the effect of the blast gun 1 will be described.

[0025] The blast gun 1 uses compressed air CA to spray the blast media BM. The blast gun 1 has a first straight pipe section 10 including a media flow path 20 through which the blast media BM flows and an air flow path 21 through which the compressed air CA flows. The blast gun 1 has a second straight pipe section 11 including an injection flow path 22 through which the blast media BM sent out from the first straight pipe section 10 flows and leads it to an injection port 32. The blast gun 1 has a curved pipe section 12 that connects the first straight pipe section 10 and the second straight pipe section 11 and includes a communication flow path 24 that communicates the media flow path 20 and the injection flow path 22. The blast gun 1 also has a suction section 40 that is formed in a part of the area composed of the first straight pipe section 10, the second straight pipe section 11, and the curved pipe section 12, and sucks in and sends out the blast media BM from the media flow path 20 by the compressed air CA that has flowed through the air flow path 21. A suction area 43 where the compressed air CA sucks the blasting media BM is located in the ejection flow path 22 .

[0026] First, in the blast gun 1, the second straight pipe section 11 on the tip side, i.e., downstream side, is connected to the first straight pipe section 10 on the upstream side via the curved pipe section 12, so that even if the surface to be processed is in a narrowed portion of the workpiece, the second straight pipe section 11 can easily enter the narrowed portion of the workpiece. In addition, in the blast gun 1, the media flow path 20 and the air flow path 21 are both included in the first straight pipe section 10. Therefore, compared to a configuration in which, for example, a supply tube for blast media and a supply tube for compressed air are connected to each other from different directions, when the second straight pipe section 11 is inserted into the narrowed portion of the workpiece, the blast gun 1 is less likely to interfere with the workpiece. Therefore, according to the blast gun 1, even if the surface to be processed is in a narrowed portion of the workpiece, the second straight pipe section 11 can reach a desired position near the workpiece, making it easier to perform blast processing on the workpiece.

[0027] In general, in a blast gun that sucks in and delivers blast media using compressed air, if there is a curved surface in the flow path from the suction area to the ejection port, the curved surface is easily worn by the blast media, which is energized by the compressed air, being blown thereto. In contrast, in the blast gun 1 according to this embodiment, the suction area 43 formed by the suction unit 40 is in the ejection flow path 22. In other words, the blast media BM delivered from the suction area 43 flows only through the ejection flow path 22, which extends linearly, while heading toward the ejection port 32, and does not flow through a curved flow path such as the communicating flow path 24 included in the curved pipe section 12. Therefore, according to the blast gun 1, it is possible to suppress wear of the flow portion of the blast media BM caused by the blast media BM being continuously blown thereto.

[0028] In this way, according to this embodiment, it is possible to provide a blast gun 1 that performs blast processing on a processing surface located in a narrowed portion while suppressing wear on the flow portion of the blast media BM.

[0029] In the blast gun 1, the media flow path 20 and the air flow path 21 may extend in parallel with each other along the extension direction D1 of the first straight pipe section 10 in at least a part of the first straight pipe section 10.

[0030] According to this blast gun 1, when the first straight pipe section 10 is viewed in a cross section perpendicular to the extension direction D1, the cross-sectional shape of the first straight pipe section 10 can be made compact. In other words, even if the surface to be processed is in a narrowed portion of the workpiece, the blast gun 1 can be made less likely to interfere with the workpiece.

[0031] Furthermore, in the blast gun 1, the first straight pipe section 10 may have an air inlet 31 for introducing compressed air CA from the outside to the upstream side of the air flow path 21, and a media inlet 30 for introducing blast media BM from the outside to the upstream side of the media flow path 20. The air inlet 31 may be provided in a side wall 10a of the first straight pipe section 10. Furthermore, the media inlet 30 may be provided in an end 10b of the first straight pipe section 10 opposite to the side connected to the curved pipe section 12.

[0032] According to this blast gun 1, firstly, since the media inlet 30 is provided at one end 10b of the first straight pipe section 10, it is possible to avoid the shape of the media flow path 20 becoming complicated, and as a result, it is possible to avoid the shape of the first straight pipe section 10 becoming complicated and large. Meanwhile, since the air inlet 31 is provided at the side wall 10a of the first straight pipe section 10, it is possible to simplify or reduce the shape of the air flow path 21, and as a result, it is possible to avoid the shape of the first straight pipe section 10 becoming complicated and large while setting the cross-sectional shape of the media flow path 20 to be relatively large. Furthermore, since the air inlet 31 is provided at the upstream side of the air flow path 21 so as to introduce the compressed air CA, it is possible to ensure a relatively wide region in the first straight pipe section 10 where the media flow path 20 and the air flow path 21 extend in parallel with each other along the extension direction D1. In other words, even if the adaptor portion 14 is connected to the air inlet 31, the adaptor portion 14 is connected to the air inlet 31 at a position relatively separated from the curved pipe portion 12. Therefore, even if the surface to be processed is in a narrowed portion of the workpiece, the blast gun 1 is less likely to interfere with the workpiece.

[0033] Furthermore, in the blast gun 1, the suction unit 40 may have an air nozzle 41 continuous with the air flow path 21, and a media circulation space 42 continuous with the media flow path 20. Furthermore, the tip opening 41b of the air nozzle 41 may protrude into the communicating flow path 24 so that the outer circumferential area of ​​the tip opening 41b becomes the media circulation space 42, and may open in the extension direction D2 of the ejection flow path 22. Here, the outer circumferential area of ​​the tip opening 41b is the surface of the outer circumferential part where the tip opening 41b is provided, and is a part that defines part of the shape of the media circulation space 42.

[0034] According to this blast gun 1, as an example, it is possible to realize a configuration in which the suction section 40 is contained within a part of the area formed by the first straight pipe section 10, the second straight pipe section 11 and the curved pipe section 12, and it is also possible to realize a configuration in which the suction area 43 is generated in the injection flow path 22.

[0035] Furthermore, in the blast gun 1, the first straight pipe section 10, the second straight pipe section 11 and the curved pipe section 12 may be integrally molded by three-dimensional additive manufacturing.

[0036] For example, when attempting to mass-produce blast gun 1 at low cost, it is desirable to manufacture blast gun 1 as a single unit, but due to the configuration or shape of blast gun 1, it may be difficult to manufacture using conventional cutting processes, etc. In contrast, with this blast gun 1, it is molded as a single unit using a three-dimensional layered modeling device as an additive manufacturing device, which is advantageous in terms of cost reduction and mass production.

[0037] In this embodiment, the first straight pipe section 10, the second straight pipe section 11, and the curved pipe section 12 that constitute the main body of the blast gun 1 are integral with each other. However, depending on manufacturing constraints, the first straight pipe section 10, the second straight pipe section 11, and the curved pipe section 12 may be manufactured as separate bodies and then joined to each other by welding or the like.

[0038] Furthermore, in this embodiment, the media flow path 20 and the air flow path 21 are each included in the first straight pipe section 10. Here, as one example, the first straight pipe section 10 is a single member as shown in Figures 1 and 2, but it may also be a joint of two members, for example, a first member including the media flow path 20 and a second member including the air flow path 21.

[0039] Second embodiment Fig. 3 is a perspective view of the blast gun 2 according to the second embodiment. Fig. 4 is a front view of the blast gun 2, in which an ejection port 82 of the blast gun 2 is seen from the front. The blast gun 2, like the blast gun 1 according to the first embodiment, is provided in a blasting device, and ejects blast media BM at a workpiece by using compressed air CA. Again, each component included in the blasting device other than the blast gun 2 may be the same as each component included in a general blasting device, and therefore illustrations and detailed descriptions are omitted here.

[0040] The blast gun 2 has a main body including a first straight pipe section 60, a second straight pipe section 61, and a curved pipe section 62. In this embodiment, the first straight pipe section 60, the second straight pipe section 61, and the curved pipe section 62 are integral with one another. The portion of the blast gun 2 that an operator grips when holding the blast gun 2 is, for example, the outer circumferential portion of the first straight pipe section 60.

[0041] Fig. 5 is a cross-sectional view of the blast gun 2. The cross section in Fig. 5 is along a plane defined by the extension direction of the main body and the direction in which a media flow path 70 and an air flow path 71, which will be described later, face each other.

[0042] The first straight pipe section 60 extends in the extension direction D1 in the figure, and is a major part of the parts constituting the main body. The first straight pipe section 60 includes a media flow path 70 and an air flow path 71 inside. The media flow path 70 distributes the blasting media BM introduced from the outside. The air flow path 71 distributes the compressed air CA introduced from the outside. In this embodiment, the media flow path 70 and the air flow path 71 extend along the extension direction D1 of the first straight pipe section 60. Furthermore, the media flow path 70 and the air flow path 71 are parallel to each other in at least a part of the first straight pipe section 60.

[0043] Here, since the air flow path 71 is a flow path through which the compressed air CA flows, the diameter of the air flow path 71 may be smaller than the diameter of the media flow path 70. Furthermore, the cross-sectional shape of each of the media flow path 70 and the air flow path 71 does not necessarily have to be circular and may be elliptical or the like.

[0044] The first straight pipe section 60 also has a media inlet 80 for introducing blast media BM from outside into the media flow path 70. The media inlet 80 is provided at one of the two end portions of the first straight pipe section 60, the end portion 60b opposite to the end portion connected to the curved pipe section 62. In this case, the media flow path 70 passes through the first straight pipe section 60 along the extension direction D1. A grip portion such as the grip portion 13 exemplified in the blast gun 1 in the first embodiment may be connected to the end portion 60b.

[0045] Furthermore, the first straight pipe section 60 has an air inlet 81 that introduces compressed air CA from the outside into the air flow path 71. The air inlet 81 is provided in the side wall 60a of the first straight pipe section 60 so as to be continuous with the downstream end of the air flow path 71. Note that an adaptor section such as the adaptor section 14 exemplified in the blast gun 1 in the first embodiment may be connected to the air inlet 81.

[0046] The second straight pipe section 61 extends in the extension direction D2 in the figure, and is the tip of the portion constituting the main body. The second straight pipe section 61 includes an ejection flow path 72 therein that circulates the blasting media BM sent out from the first straight pipe section 60 and guides it to the ejection port 82. The extension direction of the ejection flow path 72 is aligned with the extension direction D2 of the second straight pipe section 61.

[0047] The curved pipe section 62 connects the first straight pipe section 60 and the second straight pipe section 61. The curved pipe section 62 includes a communication flow path 74 that connects the media flow path 70 in the first straight pipe section 60 and the ejection flow path 72 in the second straight pipe section 61. In other words, the blasting media BM that has flowed through the media flow path 70 is guided to the ejection flow path 72 through the communication flow path 74, and is finally discharged to the outside from the ejection port 82. The first straight pipe section 60 and the second straight pipe section 61 are connected through the curved pipe section 62, so that the extension direction D2 of the second straight pipe section 61 and the ejection flow path 72 is inclined by the second angle θ2 with respect to the extension direction D1 of the first straight pipe section 60 and the media flow path 70. The second angle θ2 is 90° in this embodiment. However, the second angle θ2 may be any angle as long as it is in the range of 1° or more and 90° or less.

[0048] The blast gun 2 also has a suction section 90 that sucks in and sends out the blast media BM from the media flow path 70 by compressed air CA that has circulated through the air flow path 71. In this embodiment, the suction section 90 is formed in a part of the area formed by the curved pipe section 62 and the second straight pipe section 61. The suction section 90 has a divergent nozzle 92 that is continuous with the communication flow path 74, and an air nozzle 91 that communicates with the air flow path 71 via a collecting flow path 91a.

[0049] The extension direction of the divergent nozzle 92 is aligned with the extension direction D2 of the jet flow passage 72. The inlet 92a of the divergent nozzle 92 is continuous with the downstream end of the media flow passage 70. On the other hand, the outlet 92b of the divergent nozzle 92 opens in the extension direction D2 of the jet flow passage 72.

[0050] The air nozzle 91 is formed of a plurality of holes provided at equal intervals in the outer peripheral region of the outlet 92b of the divergent nozzle 92. In this embodiment, the number of holes constituting the air nozzle 91 is eight, but is not limited to this. The collecting flow passage 91a is, for example, an annular flow passage having the same central axis as the divergent nozzle 92. In this case, a part of the divergent nozzle 92 penetrates a portion that defines the inner circumference of the collecting flow passage 91a without contact. One end of each of the plurality of holes constituting the air nozzle 91 communicates with the collecting flow passage 91a. The plurality of holes constituting the air nozzle 91 are each open in the extension direction D2 of the ejection flow passage 72. According to this structure, it is possible to realize a structure in which the blasting medium BM is sent from the media flow passage 70 to the divergent nozzle 92, while the compressed air CA is sent from the air flow passage 71 to the plurality of holes constituting the air nozzle 91, in a compact shape. Here, the suction area 93 where the compressed air CA sucks the blasting medium BM is in the ejection flow passage 72.

[0051] The blast gun 2 according to this embodiment has the same effect as the blast gun 1 according to the first embodiment. In addition, since the blast gun 2 employs a divergent nozzle 92 as the suction section 90, it can be advantageous when it is desired to spray the blast media BM at a wide angle by setting the outlet 92b near the nozzle 82 or setting the opening shape of the nozzle 82 to be relatively large.

[0052] Although some embodiments have been described, the embodiments can be modified or modified based on the above disclosure. All components of the above embodiments and all features described in the claims may be individually extracted and combined as long as they are not mutually inconsistent. [Explanation of symbols]

[0053] 1,2 Blast Gun 10,60 1st straight pipe section 10a,60a Side wall 10b,60b end 11,61 2nd straight pipe section 12,62 Bent pipe section 20,70 Media Channel 21,71 Air passage 22,72 Injection channel 24,74 Connecting passage 30,80 Media Inlet 31,81 Air inlet 40,90 Suction part 41,91 Air nozzle 41b Tip opening 42 Media Distribution Space 43,93 Suction area 92 Divergent nozzle 92b exit BM Blast Media CA Compressed Air D1 Extension direction of the first straight pipe section D2: Extension direction of the second straight pipe section

Claims

1. A blast gun that uses compressed air to spray blast media, A first straight pipe section including a media flow path through which the blast medium flows and an air flow path through which the compressed air flows; A second straight pipe section including an injection flow path through which the blasting medium delivered from the first straight pipe section flows and is guided to an injection port; a curved pipe section that connects the first straight pipe section and the second straight pipe section and includes a communication flow path that communicates the media flow path and the ejection flow path; a suction section that is formed in a part of a region constituted by the second straight pipe section and the curved pipe section and that sucks and sends out the blast medium from the media flow path by the compressed air that has flowed through the air flow path, a suction area in which the compressed air sucks the blasting medium is located in the ejection flow path; The suction unit is a divergent nozzle connected to the communication flow passage; an air nozzle formed of a plurality of holes provided in an outer peripheral region of an outlet of the divergent nozzle, the air nozzle being continuous with the air flow path, A blast gun, wherein an outlet of the divergent nozzle and the air nozzle are open in an extension direction of the injection flow path.

2. The blast gun according to claim 1 , wherein the media flow path and the air flow path extend in parallel to each other along an extension direction of the first straight pipe portion in at least a part of the first straight pipe portion.

3. The first straight pipe portion is an air inlet port for introducing the compressed air from the outside to an upstream side of the air flow path; a media inlet for introducing the blast media from an external source on an upstream side of the media flow path; The air inlet is provided in a side wall of the first straight pipe portion, The blast gun according to claim 1 or 2, wherein the media inlet is provided at an end of the first straight pipe portion opposite to a side connected to the curved pipe portion.

4. The blast gun according to any one of claims 1 to 3, wherein the first straight pipe section, the second straight pipe section, and the curved pipe section are integrally molded by three-dimensional additive manufacturing.

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