JP6850098B2

JP6850098B2 - Ejector and mounting structure

Info

Publication number: JP6850098B2
Application number: JP2016183921A
Authority: JP
Inventors: 悠一杉江; 史裕川島
Original assignee: Tlv Co Ltd
Current assignee: Tlv Co Ltd
Priority date: 2016-09-21
Filing date: 2016-09-21
Publication date: 2021-03-31
Anticipated expiration: 2036-09-21
Also published as: JP2018048578A

Description

ここに開示された技術は、エゼクタに関し、さらには、２つの部材の取付構造に関する。 The techniques disclosed herein relate to the ejector and further to the mounting structure of the two members.

例えば特許文献１に一般的なエゼクタが開示されている。エゼクタは、第１流体を噴出するノズルと、ノズルを収容し、第２流体を吸引する吸引部を形成するケーシングと、出口流路を有し、吸引部の第１流体及び第２流体を混合して吐出するディフューザとを備えている。このエゼクタでは、第１流体（駆動流体）がノズルから噴出することによって負圧（圧力降下）が発生し、この負圧により第２流体（被駆動流体）が吸引部に吸引される。そして、第１流体及び第２流体は混合されディフューザ（出口）から吐出される。ディフューザには拡大流路（下流にいくに従って断面積が大きくなる流路）が設けられており、第１流体及び第２流体の混合流体は拡大流路を流れる際に減速及び昇圧される。こうしてエゼクタから吐出された混合流体は、エゼクタの下流側の装置等に供給される。 For example, Patent Document 1 discloses a general ejector. The ejector has a nozzle for ejecting the first fluid, a casing for accommodating the nozzle and forming a suction portion for sucking the second fluid, and an outlet flow path, and mixes the first fluid and the second fluid of the suction portion. It is equipped with a diffuser that discharges. In this ejector, a negative pressure (pressure drop) is generated by ejecting the first fluid (driving fluid) from the nozzle, and the second fluid (driven fluid) is sucked into the suction portion by this negative pressure. Then, the first fluid and the second fluid are mixed and discharged from the diffuser (outlet). The diffuser is provided with an expansion flow path (a flow path whose cross-sectional area increases as it goes downstream), and the mixed fluid of the first fluid and the second fluid is decelerated and boosted when flowing through the expansion flow path. The mixed fluid discharged from the ejector in this way is supplied to a device or the like on the downstream side of the ejector.

特開２０００−３５６３０５号公報Japanese Unexamined Patent Publication No. 2000-356305

ところで、混合流体の吐出圧力や第２流体の吸入流量等のエゼクタの性能は、ディフューザに形成された出口流路の仕様、即ち、寸法によって変わる。出口流路の仕様は、ディフューザの全部又は一部を取り換え可能なアタッチメントで形成することによって簡易に変更することができる。 By the way, the performance of the ejector such as the discharge pressure of the mixed fluid and the suction flow rate of the second fluid changes depending on the specifications of the outlet flow path formed in the diffuser, that is, the dimensions. The specifications of the outlet flow path can be easily changed by forming all or part of the diffuser with replaceable attachments.

ディフューザの全部又は一部をアタッチメントで形成した構成においては、アタッチメントの前後の部材は固定されているので、アタッチメントを着脱させる際には、アタッチメントを前後の部材の取付面と平行にスライドさせて着脱させる。このとき、アタッチメントの位置決めを精度良く行う必要がある。アタッチメントの出口流路の軸心がノズルの軸心やアタッチメントの下流側の部材の出口流路の軸心からずれると、エゼクタの性能が悪化してしまうためである。 In a configuration in which all or part of the diffuser is formed by attachments, the front and rear members of the attachment are fixed. Therefore, when attaching or detaching the attachment, slide the attachment in parallel with the mounting surfaces of the front and rear members to attach or detach it. Let me. At this time, it is necessary to accurately position the attachment. This is because if the axis of the outlet flow path of the attachment deviates from the axis of the nozzle or the axis of the outlet flow path of the member on the downstream side of the attachment, the performance of the ejector deteriorates.

また、エゼクタに限らず、アタッチメントを取付面の法線方向から取り付けることができず、アタッチメントを取付面と平行にスライドさせて取り付けなければならない状況は、様々な構成で生じ得る。 Further, not limited to the ejector, a situation in which the attachment cannot be attached from the normal direction of the attachment surface and the attachment must be attached by sliding it in parallel with the attachment surface may occur in various configurations.

ここに開示された技術は、かかる点に鑑みてなされたものであり、その目的とするところは、エゼクタにおけるディフューザの少なくとも一部をアタッチメントで形成する構成のように、アタッチメントを取付面と平行にスライドさせながら取り付ける際のアタッチメントの位置決め精度を向上させることにある。 The technique disclosed herein has been made in view of this point, and its purpose is to make the attachment parallel to the mounting surface, such as in a configuration in which at least a portion of the diffuser in the ejector is formed by the attachment. The purpose is to improve the positioning accuracy of the attachment when it is attached while sliding.

ここに開示されたエゼクタは、第１流体を噴出するノズルと、前記ノズルからの前記第１流体の噴出によって生じる負圧により第２流体を吸引する吸引部と、前記吸引部に連通する出口流路を有し、前記吸引部の前記第１流体及び前記第２流体を混合して吐出するディフューザとを備え、前記ディフューザの全部又は一部は、取り換え可能なアタッチメントで形成され、前記アタッチメントは、上流側の固定部材の第１取付面に取り付けられる第２取付面を有し、前記第１取付面及び前記第２取付面の一方には、第１突起及び第２突起が設けられ、前記第１取付面及び前記第２取付面の他方には、前記アタッチメントの取付時に前記第１突起を案内する第１係合溝と、前記アタッチメントの取付時に前記第２突起を案内する第２係合溝が形成され、前記第１係合溝及び第２係合溝の一端は、前記第２取付面を前記第１取付面に対して摺動させながら前記アタッチメントを前記上流側の固定部材に取り付けるときに前記第１突起及び第２突起が進入するように、前記上流側の固定部材又は前記アタッチメントの外周面に開口しており、前記第２係合溝の溝幅は、前記一端からしだいに細くなっている。 The ejector disclosed here includes a nozzle that ejects the first fluid, a suction portion that sucks the second fluid by the negative pressure generated by the ejection of the first fluid from the nozzle, and an outlet flow that communicates with the suction portion. It has a path and includes a diffuser that mixes and discharges the first fluid and the second fluid of the suction portion, and all or a part of the diffuser is formed by a replaceable attachment. It has a second mounting surface that is mounted on the first mounting surface of the fixing member on the upstream side, and one of the first mounting surface and the second mounting surface is provided with a first protrusion and a second protrusion. On the other side of the mounting surface and the second mounting surface, a first engaging groove that guides the first protrusion when the attachment is mounted and a second engaging groove that guides the second protrusion when the attachment is mounted. Is formed, and one end of the first engaging groove and the second engaging groove is attached to the fixing member on the upstream side while sliding the second mounting surface with respect to the first mounting surface. The first protrusion and the second protrusion are opened in the outer peripheral surface of the fixing member on the upstream side or the attachment so that the first protrusion and the second protrusion can enter, and the groove width of the second engagement groove is gradually narrowed from one end. It has become.

また、ここに開示された取付構造は、第１部材とアタッチメントとを取り付ける取付構造であって、前記第１部材は、前記アタッチメントが取り付けられる第１取付面を有し、前記アタッチメントは、前記第１取付面に取り付けられる第２取付面を有し、前記第１取付面及び前記第２取付面の一方には、第１突起及び第２突起が形成され、前記第１取付面及び前記第２取付面の他方には、前記アタッチメントの取付時に前記第１突起を案内する第１係合溝と、前記アタッチメントの取付時に前記第２突起を案内する第２係合溝が形成され、前記第１係合溝及び第２係合溝の一端は、前記第２取付面を前記第１取付面に対して摺動させながら前記アタッチメントを前記第１部材に取り付けるときに前記第１突起及び第２突起が進入するように、前記第１部材又は前記アタッチメントの外周面に開口しており、前記第２係合溝の溝幅は、前記一端からしだいに細くなっている。 Further, the mounting structure disclosed here is a mounting structure for mounting a first member and an attachment, the first member has a first mounting surface to which the attachment is mounted, and the attachment is the first member. It has a second mounting surface that is mounted on one mounting surface, and a first protrusion and a second protrusion are formed on one of the first mounting surface and the second mounting surface, and the first mounting surface and the second mounting surface are formed. On the other side of the mounting surface, a first engaging groove that guides the first protrusion when the attachment is mounted and a second engaging groove that guides the second protrusion when the attachment is mounted are formed. The engaging groove and one end of the second engaging groove are the first protrusion and the second protrusion when the attachment is attached to the first member while sliding the second mounting surface with respect to the first mounting surface. Is opened on the outer peripheral surface of the first member or the attachment so that the first member or the attachment can be inserted, and the groove width of the second engaging groove is gradually narrowed from one end.

前記エゼクタによれば、アタッチメントを取付面と平行にスライドさせながら取り付ける際のアタッチメントの位置決め精度を向上させることができる。 According to the ejector, it is possible to improve the positioning accuracy of the attachment when mounting the attachment while sliding it in parallel with the mounting surface.

前記取付構造によれば、アタッチメントを取付面と平行にスライドさせながら取り付ける際のアタッチメントの位置決め精度を向上させることができる。 According to the mounting structure, it is possible to improve the positioning accuracy of the attachment when mounting the attachment while sliding it in parallel with the mounting surface.

図１は、エゼクタの構成を模式的に示す図である。FIG. 1 is a diagram schematically showing the configuration of an ejector. 図２は、第１フランジの斜視図である。FIG. 2 is a perspective view of the first flange. 図３は、第２フランジの斜視図である。FIG. 3 is a perspective view of the second flange. 図４は、第３フランジの斜視図である。FIG. 4 is a perspective view of the third flange. 図５は、第４フランジの斜視図である。FIG. 5 is a perspective view of the fourth flange. 図６は、取付の序盤における第１フランジ及び第２フランジの状態を示す図である。FIG. 6 is a diagram showing a state of the first flange and the second flange in the early stage of mounting. 図７は、取付の中盤における第１フランジ及び第２フランジの状態を示す図である。FIG. 7 is a diagram showing a state of the first flange and the second flange in the middle stage of mounting. 図８は、取付の終盤における第１フランジ及び第２フランジの状態を示す図である。FIG. 8 is a diagram showing a state of the first flange and the second flange at the final stage of mounting.

以下、例示的な実施形態を図面に基づいて詳細に説明する。図１は、エゼクタの構成を模式的に示す図である。 Hereinafter, exemplary embodiments will be described in detail with reference to the drawings. FIG. 1 is a diagram schematically showing the configuration of an ejector.

エゼクタ１０は、高圧蒸気（第１流体）を噴出させることによって低圧蒸気（第２流体）を吸引し、これら蒸気を混合して吐出する蒸気エゼクタである。つまり、エゼクタ１０において、高圧蒸気は駆動流体であり、低圧蒸気は吸引流体である。エゼクタ１０は、ノズル２０と、吸引部３０と、ディフューザ４０とを備えている。 The ejector 10 is a steam ejector that sucks low-pressure steam (second fluid) by ejecting high-pressure steam (first fluid), mixes these steams, and discharges them. That is, in the ejector 10, the high-pressure steam is the driving fluid and the low-pressure steam is the suction fluid. The ejector 10 includes a nozzle 20, a suction unit 30, and a diffuser 40.

ノズル２０には、高圧蒸気の供給元に繋がる流入配管９１が接続されている。ノズル２０は、供給される高圧蒸気を所定の軸心Ａの方向に噴出する。ノズル２０の先端部は、吸引部３０に収容されている。 An inflow pipe 91 connected to a high-pressure steam supply source is connected to the nozzle 20. The nozzle 20 ejects the supplied high-pressure steam in the direction of the predetermined axis A. The tip of the nozzle 20 is housed in the suction unit 30.

吸引部３０には、低圧蒸気の吸引口３１が設けられている。ノズル２０から高圧蒸気が噴出することにより生じる負圧（圧力降下）によって、低圧蒸気が吸引口３１から吸引部３０へ吸引される。つまり、吸引部３０では、高圧蒸気のジェットポンプ効果によって生じる負圧により、低圧蒸気を吸引するための吸引力が発生する。吸引口３１には、低圧蒸気の供給元に繋がる吸引配管９２が接続されている。また、吸引部３０には、高圧蒸気と低圧蒸気との混合蒸気が排出される排出口が設けられている。排出口３２には、ディフューザ４０が取り付けられる第１フランジ５０が設けられている。 The suction unit 30 is provided with a suction port 31 for low-pressure steam. The low-pressure steam is sucked from the suction port 31 to the suction unit 30 by the negative pressure (pressure drop) generated by ejecting the high-pressure steam from the nozzle 20. That is, in the suction unit 30, a suction force for sucking the low pressure steam is generated by the negative pressure generated by the jet pump effect of the high pressure steam. A suction pipe 92 connected to a low-pressure steam supply source is connected to the suction port 31. Further, the suction unit 30 is provided with an outlet for discharging mixed steam of high-pressure steam and low-pressure steam. The discharge port 32 is provided with a first flange 50 to which the diffuser 40 is attached.

ディフューザ４０は、吸引部３０に接続されている。ディフューザ４０は、吸引部３０に噴出された高圧蒸気と吸引部３０に吸引された低圧蒸気とを混合して吐出するものである。ディフューザ４０の下流端には、混合蒸気の供給先に繋がる流出配管９３が接続されている。 The diffuser 40 is connected to the suction unit 30. The diffuser 40 mixes and discharges the high-pressure steam ejected to the suction unit 30 and the low-pressure steam sucked to the suction unit 30. An outflow pipe 93 connected to a supply destination of the mixed steam is connected to the downstream end of the diffuser 40.

ディフューザ４０は、アタッチメント４１と下流部４２とを含む分割構造となっている。アタッチメント４１の上流端には、第２フランジ６０が設けられ、アタッチメント４１の下流端には、第３フランジ７０が設けられている。第２フランジ６０は、吸引部３０の第１フランジ５０に取り付けられる。第１フランジ５０と第２フランジ６０とは、ボルト固定される。下流部４２の上流端には、第４フランジ８０が設けられている。第４フランジ８０に、アタッチメント４１の第３フランジ７０が取り付けられる。第３フランジ７０と第４フランジ８０とは、ボルト固定される。下流部４２の下流端には、流出配管９３に接続されている。 The diffuser 40 has a divided structure including an attachment 41 and a downstream portion 42. A second flange 60 is provided at the upstream end of the attachment 41, and a third flange 70 is provided at the downstream end of the attachment 41. The second flange 60 is attached to the first flange 50 of the suction portion 30. The first flange 50 and the second flange 60 are bolted together. A fourth flange 80 is provided at the upstream end of the downstream portion 42. The third flange 70 of the attachment 41 is attached to the fourth flange 80. The third flange 70 and the fourth flange 80 are bolted together. The downstream end of the downstream portion 42 is connected to the outflow pipe 93.

このように、アタッチメント４１は、吸引部３０と下流部４２とに挟み込まれており、吸引部３０及び下流部４２に取り付けられている。吸引部３０が上流側の固定部材の一例であり、下流部４２が下流側の固定部材の一例である。 In this way, the attachment 41 is sandwiched between the suction portion 30 and the downstream portion 42, and is attached to the suction portion 30 and the downstream portion 42. The suction portion 30 is an example of the fixing member on the upstream side, and the downstream portion 42 is an example of the fixing member on the downstream side.

ディフューザ４０には、吸引部３０に連通する、高圧蒸気及び低圧蒸気の出口流路４３が形成されている。出口流路４３は、上流側から順に連なる、縮小流路４４、平行流路４５及び拡大流路４６を含んでいる。出口流路４３の断面は、略円形をしている。ディフューザ４０は、混合蒸気が拡大流路４６を流れる際に混合蒸気を減速及び昇圧させる。出口流路４３の軸心Ｂは、一直線に延びている。すなわち、縮小流路４４の軸心、平行流路４５の軸心及び拡大流路４６の軸心は、一直線上に並んでいる。 The diffuser 40 is formed with outlet flow paths 43 for high-pressure steam and low-pressure steam that communicate with the suction unit 30. The outlet flow path 43 includes a reduction flow path 44, a parallel flow path 45, and an expansion flow path 46, which are sequentially connected from the upstream side. The cross section of the outlet flow path 43 has a substantially circular shape. The diffuser 40 decelerates and boosts the mixed steam as it flows through the expansion flow path 46. The axis B of the outlet flow path 43 extends in a straight line. That is, the axis of the reduction flow path 44, the axis of the parallel flow path 45, and the axis of the expansion flow path 46 are aligned on a straight line.

縮小流路４４の上流端は、吸引部３０の排出口３２と連通している。縮小流路４４の上流端は、吸引部３０においてノズル２０の噴口と対向している。縮小流路４４の断面積、即ち、内径は、下流側に向かってしだいに小さくなっている。縮小流路４４の下流端には、平行流路４５が接続されている。平行流路４５は、断面積、即ち、内径が一定の流路である。平行流路４５は、出口流路４３において最も内径が小さい部分であり、いわゆる、喉部を構成している。平行流路４５の下流端には、拡大流路４６が接続されている。拡大流路４６の断面積、即ち、内径は、下流側に向かってしだいに大きくなっている。 The upstream end of the reduced flow path 44 communicates with the discharge port 32 of the suction unit 30. The upstream end of the reduced flow path 44 faces the nozzle of the nozzle 20 in the suction portion 30. The cross-sectional area of the reduced flow path 44, that is, the inner diameter, gradually decreases toward the downstream side. A parallel flow path 45 is connected to the downstream end of the reduction flow path 44. The parallel flow path 45 is a flow path having a constant cross-sectional area, that is, an inner diameter. The parallel flow path 45 is a portion of the outlet flow path 43 having the smallest inner diameter, and constitutes a so-called throat portion. An enlarged flow path 46 is connected to the downstream end of the parallel flow path 45. The cross-sectional area of the expansion flow path 46, that is, the inner diameter, gradually increases toward the downstream side.

縮小流路４４及び平行流路４５は、アタッチメント４１に形成されている。拡大流路４６は、アタッチメント４１から下流部４２に亘って形成されている。すなわち、出口流路４３の少なくとも上流端部を含む一部がアタッチメント４１に形成され、出口流路４３の残りの部分が下流部４２に形成されている。 The reduced flow path 44 and the parallel flow path 45 are formed in the attachment 41. The expansion flow path 46 is formed from the attachment 41 to the downstream portion 42. That is, a part including at least the upstream end of the outlet flow path 43 is formed in the attachment 41, and the remaining part of the outlet flow path 43 is formed in the downstream part 42.

このように構成されたエゼクタ１０では、流入配管９１を流通する高圧蒸気がノズル２０から吸引部３０内に噴出されると共に、その高圧蒸気の噴出によって低圧蒸気が吸引口３１から吸引部３０内に吸引される。そして、吸引部３０の高圧蒸気及び低圧蒸気は、混合してディフューザ４０から吐出される。ディフューザ４０から吐出された蒸気は、下流側の装置に供給される。混合蒸気の流速は、ディフューザ４０の平行流路４５で概ね音速となる。その後、混合蒸気は、拡大流路４６を流れる際に減速及び昇圧される。 In the ejector 10 configured in this way, the high-pressure steam flowing through the inflow pipe 91 is ejected from the nozzle 20 into the suction unit 30, and the low-pressure steam is ejected from the suction port 31 into the suction unit 30. Be sucked. Then, the high-pressure steam and the low-pressure steam of the suction unit 30 are mixed and discharged from the diffuser 40. The steam discharged from the diffuser 40 is supplied to the device on the downstream side. The flow velocity of the mixed steam is approximately the speed of sound in the parallel flow path 45 of the diffuser 40. After that, the mixed steam is decelerated and boosted as it flows through the expansion flow path 46.

ここで、エゼクタ１０において低圧蒸気の吸入流量を確保できる吐出圧力には上限（以下、この吐出圧力を「最高吐出圧力」という）がある。吐出圧力が最高吐出圧力を超えて上昇すると、吸入圧力も上昇し始める。やがて、平行流路４５における流速が音速よりも低下して非臨界状態となり、吸入圧力が吐出圧力とほぼ同等の値まで上昇してゆく。つまり、吐出圧力が最高吐出圧力を超えると、低圧蒸気の吸入流量が急激に減少していく。 Here, there is an upper limit (hereinafter, this discharge pressure is referred to as "maximum discharge pressure") in the discharge pressure that can secure the suction flow rate of the low-pressure steam in the ejector 10. When the discharge pressure rises above the maximum discharge pressure, the suction pressure also begins to rise. Eventually, the flow velocity in the parallel flow path 45 becomes lower than the speed of sound and becomes a non-critical state, and the suction pressure rises to a value substantially equal to the discharge pressure. That is, when the discharge pressure exceeds the maximum discharge pressure, the suction flow rate of the low-pressure steam decreases sharply.

最高吐出圧力は、出口流路４３の仕様、即ち、寸法によって変更することができる。例えば、平行流路４５の内径を小さくすることによって、最大吐出圧力を高めることが考えられる。平行流路４５の内径が減少すると、平行流路４５における混合蒸気の流速が上昇するので、平行流路４５における圧力の臨界状態が確保されやすくなる。 The maximum discharge pressure can be changed according to the specifications of the outlet flow path 43, that is, the dimensions. For example, it is conceivable to increase the maximum discharge pressure by reducing the inner diameter of the parallel flow path 45. When the inner diameter of the parallel flow path 45 decreases, the flow velocity of the mixed steam in the parallel flow path 45 increases, so that the critical state of the pressure in the parallel flow path 45 can be easily secured.

しかしながら、平行流路４５の内径だけを変更するのでは、最大吐出圧力を高めることができないばかりか、エゼクタ１０の性能を維持することができない場合もある。例えば、最大吐出圧力を高めることができても低圧蒸気の吸入流量が大幅に減少したり、逆に最大吐出圧力が低下したりする場合もある。そのため、平行流路４５の内径に加えて、縮小流路４４の長さや平行流路４５の長さも変更される。 However, if only the inner diameter of the parallel flow path 45 is changed, not only the maximum discharge pressure cannot be increased, but also the performance of the ejector 10 may not be maintained. For example, even if the maximum discharge pressure can be increased, the suction flow rate of the low-pressure steam may be significantly reduced, or conversely, the maximum discharge pressure may be lowered. Therefore, in addition to the inner diameter of the parallel flow path 45, the length of the reduced flow path 44 and the length of the parallel flow path 45 are also changed.

ディフューザ４０は、アタッチメント４１を取り替えることによって出口流路４３の寸法が変更可能に構成されている。これにより、エゼクタ１０の全体を交換しなくても、出口流路４３の寸法を簡単に変更することができる。 The diffuser 40 is configured so that the dimensions of the outlet flow path 43 can be changed by replacing the attachment 41. As a result, the dimensions of the outlet flow path 43 can be easily changed without replacing the entire ejector 10.

以下、アタッチメント４１の取付構造について詳細に説明する。 Hereinafter, the mounting structure of the attachment 41 will be described in detail.

−アタッチメント４１の上流側の取付構造−
図２は、第１フランジ５０の斜視図である。図３は、第２フランジ６０の斜視図である。図２，３では、吸引部３０のうち第１フランジ５０以外の部分、及び、アタッチメント４１の第２フランジ６０以外の部分が省略されている。 -Mounting structure on the upstream side of attachment 41-
FIG. 2 is a perspective view of the first flange 50. FIG. 3 is a perspective view of the second flange 60. In FIGS. 2 and 3, a portion of the suction portion 30 other than the first flange 50 and a portion of the attachment 41 other than the second flange 60 are omitted.

吸引部３０の第１フランジ５０は、図２に示すように、アタッチメント４１が取り付けられる第１取付面５１を有している。アタッチメント４１の第２フランジ６０は、図３に示すように、第１取付面５１に取り付けられる第２取付面６１を有している。第１取付面５１及び第２取付面６１は、円環状に形成されている。アタッチメント４１は、第２取付面６１が第１取付面５１に接した状態で吸引部３０に取り付けられる。このとき、第１取付面５１と第２取付面６１との間には、円環状のガスケット５９が配置される。 As shown in FIG. 2, the first flange 50 of the suction portion 30 has a first mounting surface 51 to which the attachment 41 is mounted. As shown in FIG. 3, the second flange 60 of the attachment 41 has a second mounting surface 61 that is mounted on the first mounting surface 51. The first mounting surface 51 and the second mounting surface 61 are formed in an annular shape. The attachment 41 is attached to the suction portion 30 in a state where the second mounting surface 61 is in contact with the first mounting surface 51. At this time, an annular gasket 59 is arranged between the first mounting surface 51 and the second mounting surface 61.

第２取付面６１には、図３に示すように、円柱状の第１突起６３及び第２突起６４が設けられている。第１突起６３及び第２突起６４は、第２取付面６１の法線方向に延びている。また、第２フランジ６０には、ボルトを挿通するための８個の挿通口６５が貫通形成されている。８個の挿通口６５は、第２フランジ６０の周方向に等間隔に配列されている。 As shown in FIG. 3, the second mounting surface 61 is provided with a columnar first protrusion 63 and a second protrusion 64. The first protrusion 63 and the second protrusion 64 extend in the normal direction of the second mounting surface 61. Further, the second flange 60 is formed through eight insertion ports 65 for inserting bolts. The eight insertion ports 65 are arranged at equal intervals in the circumferential direction of the second flange 60.

一方、第１取付面５１には、第１突起６３が係合する第１係合溝５３と、第２突起６４が係合する第２係合溝５４とが形成されている。アタッチメント４１の取付時に、第１係合溝５３は第１突起６３を案内し、第２係合溝５４は第２突起６４を案内する。すなわち、第１係合溝５３及び第２係合溝５４の溝幅はそれぞれ、第１突起６３及び第２突起６４が摺動可能な幅になっている。第１係合溝５３及び第２係合溝５４の一端は、吸引部３０の外周面、詳しくは、第１フランジ５０の外周面５２に開口している。また、第１フランジ５０には、ボルトを挿通するための８個の挿通口５５が貫通形成されている。８個の挿通口５５は、第１フランジ５０の周方向に等間隔に配列されている。 On the other hand, the first mounting surface 51 is formed with a first engaging groove 53 with which the first protrusion 63 is engaged and a second engaging groove 54 with which the second protrusion 64 is engaged. When the attachment 41 is attached, the first engaging groove 53 guides the first protrusion 63, and the second engaging groove 54 guides the second protrusion 64. That is, the groove widths of the first engaging groove 53 and the second engaging groove 54 are such that the first protrusion 63 and the second protrusion 64 can slide, respectively. One ends of the first engaging groove 53 and the second engaging groove 54 are open to the outer peripheral surface of the suction portion 30, specifically, the outer peripheral surface 52 of the first flange 50. Further, eight insertion holes 55 for inserting bolts are formed through the first flange 50. The eight insertion holes 55 are arranged at equal intervals in the circumferential direction of the first flange 50.

第１係合溝５３は、第１フランジ５０の外周面５２に開口する一端から延びる第１導入部５３ａと、第１導入部５３ａから湾曲しながら延びる第１湾曲部５３ｂとを有している。第１係合溝５３は、第１導入部５３ａと第１湾曲部５３ｂとの第１接続部５３ｃで屈曲している。第１係合溝５３の溝幅は、概ね一定である。 The first engaging groove 53 has a first introduction portion 53a extending from one end opening to the outer peripheral surface 52 of the first flange 50, and a first curved portion 53b extending while bending from the first introduction portion 53a. .. The first engaging groove 53 is bent at the first connecting portion 53c between the first introducing portion 53a and the first curved portion 53b. The groove width of the first engaging groove 53 is substantially constant.

第２係合溝５４の全体は、湾曲しながら延びる第２湾曲部５４ａで構成されている。第２係合溝５４の長さは、第１係合溝５３の長さよりも長い。第２係合溝５４の一端の溝幅は、第１係合溝５３の一端の溝幅よりも広くなっており、第２突起６４の太さよりも広い。第２係合溝５４の溝幅は、一端からしだいに細くなり、最終的には第２突起６４の太さと同程度か、第２突起６４の太さよりも細くなっている。 The entire second engaging groove 54 is composed of a second curved portion 54a that extends while being curved. The length of the second engaging groove 54 is longer than the length of the first engaging groove 53. The groove width at one end of the second engaging groove 54 is wider than the groove width at one end of the first engaging groove 53, and is wider than the thickness of the second protrusion 64. The groove width of the second engaging groove 54 gradually becomes narrower from one end, and finally becomes about the same as the thickness of the second protrusion 64 or thinner than the thickness of the second protrusion 64.

−アタッチメント４１の下流側の取付構造−
図４は、第３フランジ７０の斜視図である。図５は、第４フランジ８０の斜視図である。図４，５では、アタッチメント４１の第３フランジ７０以外の部分、及び、下流部４２のうち第４フランジ８０以外の部分が省略されている。 -Mounting structure on the downstream side of attachment 41-
FIG. 4 is a perspective view of the third flange 70. FIG. 5 is a perspective view of the fourth flange 80. In FIGS. 4 and 5, a portion of the attachment 41 other than the third flange 70 and a portion of the downstream portion 42 other than the fourth flange 80 are omitted.

下流部４２の第４フランジ８０は、図５に示すように、アタッチメント４１が取り付けられる第４取付面８１を有している。第４取付面８１は、第１取付面５１と平行に形成されている。アタッチメント４１の第３フランジ７０は、図４に示すように、第４取付面８１に取り付けられる第３取付面７１を有している。第３取付面７１は、第２取付面５２と平行に形成されている。第３取付面７１及び第４取付面８１は、円環状に形成されている。アタッチメント４１は、第３取付面７１が第４取付面８１に接した状態で下流部４２に取り付けられる。このとき、第３取付面７１と第４取付面８１との間には、円環状のガスケット８９が配置される。 As shown in FIG. 5, the fourth flange 80 of the downstream portion 42 has a fourth mounting surface 81 to which the attachment 41 is mounted. The fourth mounting surface 81 is formed parallel to the first mounting surface 51. As shown in FIG. 4, the third flange 70 of the attachment 41 has a third mounting surface 71 that is mounted on the fourth mounting surface 81. The third mounting surface 71 is formed parallel to the second mounting surface 52. The third mounting surface 71 and the fourth mounting surface 81 are formed in an annular shape. The attachment 41 is attached to the downstream portion 42 in a state where the third mounting surface 71 is in contact with the fourth mounting surface 81. At this time, an annular gasket 89 is arranged between the third mounting surface 71 and the fourth mounting surface 81.

第３取付面７１には、図４に示すように、円柱状の第３突起７３及び第４突起７４が設けられている。第３突起７３及び第４突起７４は、第３取付面７１の法線方向に延びている。また、第３フランジ７０には、ボルトを挿通するための８個の挿通口７５が貫通形成されている。８個の挿通口７５は、第３フランジ７０の周方向に等間隔に配列されている。 As shown in FIG. 4, the third mounting surface 71 is provided with a columnar third protrusion 73 and a fourth protrusion 74. The third protrusion 73 and the fourth protrusion 74 extend in the normal direction of the third mounting surface 71. Further, the third flange 70 is formed through eight insertion ports 75 for inserting bolts. The eight insertion holes 75 are arranged at equal intervals in the circumferential direction of the third flange 70.

一方、第４取付面８１には、図５に示すように、第３突起７３が係合する第３係合溝８３と、第４突起７４が係合する第４係合溝８４とが形成されている。アタッチメント４１の取付時に、第３係合溝８３は第３突起７３を案内し、第４係合溝８４は第４突起７４を案内する。すなわち、第３係合溝８３及び第４係合溝８４の溝幅はそれぞれ、第３突起７３及び第４突起７４が摺動可能な幅になっている。第３係合溝８３及び第４係合溝８４の一端は、下流部４２の外周面、詳しくは、第４フランジ８０の外周面８２に開口している。また、第４フランジ８０には、ボルトを挿通するための８個の挿通口８５が貫通形成されている。８個の挿通口８５は、第４フランジ８０の周方向に等間隔に配列されている。 On the other hand, as shown in FIG. 5, the fourth mounting surface 81 is formed with a third engaging groove 83 with which the third protrusion 73 is engaged and a fourth engaging groove 84 with which the fourth protrusion 74 is engaged. Has been done. When the attachment 41 is attached, the third engaging groove 83 guides the third protrusion 73, and the fourth engaging groove 84 guides the fourth protrusion 74. That is, the groove widths of the third engaging groove 83 and the fourth engaging groove 84 are such that the third protrusion 73 and the fourth protrusion 74 can slide, respectively. One end of the third engaging groove 83 and the fourth engaging groove 84 is open to the outer peripheral surface of the downstream portion 42, specifically, the outer peripheral surface 82 of the fourth flange 80. Further, eight insertion ports 85 for inserting bolts are formed through the fourth flange 80. The eight insertion ports 85 are arranged at equal intervals in the circumferential direction of the fourth flange 80.

第３係合溝８３は、第４フランジ８０の外周面８２に開口する一端から延びる第３導入部８３ａと、第３導入部８３ａから湾曲しながら延びる第３湾曲部８３ｂとを有している。第３係合溝８３は、第３導入部８３ａと第３湾曲部８３ｂとの第３接続部８３ｃで屈曲している。第３係合溝８３の溝幅は、概ね一定である。 The third engaging groove 83 has a third introduction portion 83a extending from one end opening to the outer peripheral surface 82 of the fourth flange 80, and a third curved portion 83b extending while bending from the third introduction portion 83a. .. The third engaging groove 83 is bent at the third connecting portion 83c between the third introducing portion 83a and the third curved portion 83b. The groove width of the third engaging groove 83 is substantially constant.

第４係合溝８４の全体は、湾曲しながら延びる第４湾曲部８４ａで構成されている。第４係合溝８４の長さは、第３係合溝８３の長さよりも長い。第４係合溝８４の一端の溝幅は、第３係合溝８３の一端の溝幅よりも広くなっており、第４突起７４の太さよりも広い。第４係合溝８４の溝幅は、一端からしだいに細くなり、最終的には第４突起７４の太さと同程度か、第４突起７４の太さよりも細くなっている。 The entire fourth engaging groove 84 is composed of a fourth curved portion 84a that extends while being curved. The length of the fourth engaging groove 84 is longer than the length of the third engaging groove 83. The groove width at one end of the fourth engaging groove 84 is wider than the groove width at one end of the third engaging groove 83, and is wider than the thickness of the fourth protrusion 74. The groove width of the fourth engaging groove 84 gradually narrows from one end, and finally becomes about the same as the thickness of the fourth protrusion 74 or thinner than the thickness of the fourth protrusion 74.

−アタッチメント４１の取付−
このように構成されたエゼクタ１０において、アタッチメント４１は以下のようにして取り付けられる。 -Attachment 41 attachment-
In the ejector 10 configured in this way, the attachment 41 is attached as follows.

吸引部３０及び下流部４２は固定されているので、吸引部３０と下流部４２との間隔は変わらない。そのため、アタッチメント４１は、ノズル２０の軸心Ａに対して側方から（即ち、軸心Ａに直交する方向から）吸引部３０と下流部４２との間にはめ込まれる。すなわち、第２取付面６１を第１取付面５１に対して摺動させ、且つ第３取付面７１を第４取付面８１に対して摺動させながら、アタッチメント４１が吸引部３０と下流部４２との間にはめ込まれる。このとき、アタッチメント４１の第２フランジ６０は、第１突起６３及び第２突起６４がそれぞれ第１係合溝５３及び第２係合溝５４に案内されることによって吸引部３０の第１フランジ５０に対して位置決めされる。同時に、アタッチメント４１の第３フランジ７０は、第３突起７３及び第４突起７４がそれぞれ第３係合溝８３及び第４係合溝８４に案内されることによって下流部４２の第４フランジ８０に対して位置決めされる。 Since the suction portion 30 and the downstream portion 42 are fixed, the distance between the suction portion 30 and the downstream portion 42 does not change. Therefore, the attachment 41 is fitted between the suction portion 30 and the downstream portion 42 from the side with respect to the axial center A of the nozzle 20 (that is, from the direction orthogonal to the axial center A). That is, while the second mounting surface 61 is slid with respect to the first mounting surface 51 and the third mounting surface 71 is slid with respect to the fourth mounting surface 81, the attachment 41 is attached to the suction portion 30 and the downstream portion 42. It is fitted between and. At this time, the second flange 60 of the attachment 41 has the first flange 50 of the suction portion 30 by guiding the first protrusion 63 and the second protrusion 64 to the first engagement groove 53 and the second engagement groove 54, respectively. Positioned against. At the same time, the third flange 70 of the attachment 41 becomes the fourth flange 80 of the downstream portion 42 by guiding the third protrusion 73 and the fourth protrusion 74 to the third engagement groove 83 and the fourth engagement groove 84, respectively. Positioned against.

第１フランジ５０に対する第２フランジ６０の位置決めを図６〜８を参照しながら説明する。図６は、取付の序盤における第１フランジ５０及び第２フランジ６０の状態を示す図である。図７は、取付の中盤における第１フランジ５０及び第２フランジ６０の状態を示す図である。図８は、取付の終盤における第１フランジ５０及び第２フランジ６０の状態を示す図である。図６〜８は、第１フランジ５０の第１取付面５１に対して正対する方向に第１フランジ５０及び第２フランジ６０を見た図である。図６〜８では、吸引部３０のうち第１フランジ５０以外の部分、及び、アタッチメント４１の第２フランジ６０以外の部分が省略されている。 The positioning of the second flange 60 with respect to the first flange 50 will be described with reference to FIGS. 6 to 8. FIG. 6 is a diagram showing a state of the first flange 50 and the second flange 60 in the early stage of mounting. FIG. 7 is a diagram showing a state of the first flange 50 and the second flange 60 in the middle stage of mounting. FIG. 8 is a diagram showing a state of the first flange 50 and the second flange 60 at the final stage of mounting. 6 to 8 are views of the first flange 50 and the second flange 60 viewed in the direction facing the first mounting surface 51 of the first flange 50. In FIGS. 6 to 8, the portion of the suction portion 30 other than the first flange 50 and the portion of the attachment 41 other than the second flange 60 are omitted.

まず、図６に示すように、第２フランジ６０の第２取付面６１を第１フランジ５０の第１取付面５１に摺動させながら、第２フランジ６０の第１突起６３及び第２突起６４を、第１フランジ５０の外周面５２に開口する、第１係合溝５３及び第２係合溝５４の一端から第１係合溝５３及び第２係合溝５４に進入させる。そして、第１突起６３が第１係合溝５３の導入部５３ａに沿って第１接続部５３ｃまで移動するように、第２フランジ６０を移動させる。 First, as shown in FIG. 6, the first protrusion 63 and the second protrusion 64 of the second flange 60 are slid on the first mounting surface 51 of the first flange 50 while the second mounting surface 61 of the second flange 60 is slid. Is entered into the first engaging groove 53 and the second engaging groove 54 from one end of the first engaging groove 53 and the second engaging groove 54, which are opened in the outer peripheral surface 52 of the first flange 50. Then, the second flange 60 is moved so that the first protrusion 63 moves along the introduction portion 53a of the first engaging groove 53 to the first connecting portion 53c.

その後、図７に示すように、第１突起６３が第１係合溝５３の湾曲部５３ｂに沿って移動し、第２突起６４が第２係合溝５４に沿って移動するように、第２フランジ６０を移動させる。このとき、第２フランジ６０、即ち、アタッチメント４１は、第１取付面５１の法線方向に延びる軸回りに回転するようになる。ここで、第１係合溝５３の湾曲部５３ｂに比べて第２係合溝５４は長いので、第１突起６３の移動量よりも第２突起６４の移動量の方が多くなる。すなわち、第２フランジ６０は、第１係合溝５３に対して第２係合溝５４の反対側に位置し且つ第１取付面５１の法線方向に延びる揺動軸を支点として揺動することになる（厳密には、揺動軸は固定ではなく、第１突起６３の移動に伴って移動する）。 After that, as shown in FIG. 7, the first protrusion 63 moves along the curved portion 53b of the first engaging groove 53, and the second protrusion 64 moves along the second engaging groove 54. 2 Move the flange 60. At this time, the second flange 60, that is, the attachment 41, rotates about an axis extending in the normal direction of the first mounting surface 51. Here, since the second engaging groove 54 is longer than the curved portion 53b of the first engaging groove 53, the moving amount of the second protrusion 64 is larger than the moving amount of the first protrusion 63. That is, the second flange 60 swings with a swing shaft located on the opposite side of the second engagement groove 54 with respect to the first engagement groove 53 and extending in the normal direction of the first mounting surface 51 as a fulcrum. (Strictly speaking, the swing shaft is not fixed, but moves with the movement of the first protrusion 63).

第２係合溝５４は他端に向かって細くなっているので、第２係合溝５４に対する第２突起６４のガタツキはしだいに小さくなっていく。 Since the second engaging groove 54 becomes thinner toward the other end, the rattling of the second protrusion 64 with respect to the second engaging groove 54 gradually becomes smaller.

最終的に、図８に示すように、第１突起６３の移動は、第１係合溝５３の他端において規制される。一方、第２突起６４の移動は、第２係合溝５４の他端又はその近傍で規制される。 Finally, as shown in FIG. 8, the movement of the first protrusion 63 is restricted at the other end of the first engagement groove 53. On the other hand, the movement of the second protrusion 64 is restricted at or near the other end of the second engaging groove 54.

こうして、第１突起６３及び第２突起６４がそれぞれ第１係合溝５３及び第２係合溝５４に位置決めされることによって、第２フランジ６０が位置決めされる。このとき、アタッチメント４１に形成された出口流路４３の軸心ｂ１がノズル２０の軸心Ａと実質的に一致する位置に、第２フランジ６０が位置決めされる。その後、挿通口５５及び挿通口６５にボルトが挿通され、第１フランジ５０と第２フランジ６０とがボルト締結される。 In this way, the first protrusion 63 and the second protrusion 64 are positioned in the first engagement groove 53 and the second engagement groove 54, respectively, so that the second flange 60 is positioned. At this time, the second flange 60 is positioned at a position where the axis b1 of the outlet flow path 43 formed in the attachment 41 substantially coincides with the axis A of the nozzle 20. After that, bolts are inserted into the insertion openings 55 and 65, and the first flange 50 and the second flange 60 are bolted together.

第４フランジ８０に対する第３フランジ７０の位置決めも、第１フランジ５０に対する第２フランジ６０の位置決めと同様に行われる。 Positioning of the third flange 70 with respect to the fourth flange 80 is performed in the same manner as positioning of the second flange 60 with respect to the first flange 50.

すなわち、図示は省略するが、第３フランジ７０の第３取付面７１を第４フランジ８０の第４取付面８１に摺動させながら、第３フランジ７０の第３突起７３及び第４突起７４を、第４フランジ８０の外周面８２に開口する、第３係合溝８３及び第４係合溝８４の一端から第３係合溝８３及び第４係合溝８４に進入させる。そして、第３突起７３が第３係合溝８３の導入部８３ａに沿って第３接続部８３ｃまで移動するように、第３フランジ７０を移動させる。 That is, although not shown, the third protrusion 73 and the fourth protrusion 74 of the third flange 70 are slid on the fourth mounting surface 81 of the fourth flange 80 while the third mounting surface 71 of the third flange 70 is slid. , The third engaging groove 83 and the fourth engaging groove 84 are made to enter from one end of the third engaging groove 83 and the fourth engaging groove 84, which are opened on the outer peripheral surface 82 of the fourth flange 80. Then, the third flange 70 is moved so that the third protrusion 73 moves along the introduction portion 83a of the third engagement groove 83 to the third connection portion 83c.

その後、第３突起７３が第３係合溝８３の湾曲部８３ｂに沿って移動し、第４突起７４が第４係合溝８４に沿って移動するように、第３フランジ７０を移動させる。このとき、第３フランジ７０、即ち、アタッチメント４１は、第４取付面８１の法線方向（即ち、第１取付面５１の法線方向）に延びる軸回りに回転するようになる。ここで、第３係合溝８３の湾曲部８３ｂに比べて第４係合溝８４は長いので、第３突起７３の移動量よりも第４突起７４の移動量の方が多くなる。すなわち、第３フランジ７０は、第３係合溝８３に対して第４係合溝８４の反対側に位置し且つ第４取付面８１の法線方向に延びる揺動軸を支点として揺動することになる（厳密には、揺動軸は固定ではなく、第３突起７３の移動に伴って移動する）。 After that, the third flange 70 is moved so that the third protrusion 73 moves along the curved portion 83b of the third engagement groove 83 and the fourth protrusion 74 moves along the fourth engagement groove 84. At this time, the third flange 70, that is, the attachment 41, rotates about an axis extending in the normal direction of the fourth mounting surface 81 (that is, the normal direction of the first mounting surface 51). Here, since the fourth engaging groove 84 is longer than the curved portion 83b of the third engaging groove 83, the moving amount of the fourth protrusion 74 is larger than the moving amount of the third protrusion 73. That is, the third flange 70 swings with a swing shaft located on the opposite side of the fourth engagement groove 84 with respect to the third engagement groove 83 and extending in the normal direction of the fourth mounting surface 81 as a fulcrum. (Strictly speaking, the swing shaft is not fixed, but moves with the movement of the third protrusion 73).

第４係合溝８４は他端に向かって細くなっているので、第４係合溝８４に対する第４突起７４のガタツキはしだいに小さくなっていく。 Since the fourth engaging groove 84 becomes thinner toward the other end, the rattling of the fourth protrusion 74 with respect to the fourth engaging groove 84 gradually becomes smaller.

最終的に、第３突起７３の移動は、第３係合溝８３の他端において規制される。一方、第４突起７４の移動は、第４係合溝８４の他端又はその近傍で規制される。 Finally, the movement of the third protrusion 73 is restricted at the other end of the third engagement groove 83. On the other hand, the movement of the fourth protrusion 74 is restricted at or near the other end of the fourth engagement groove 84.

こうして、第３突起７３及び第４突起７４がそれぞれ第３係合溝８３及び第４係合溝８４に位置決めされることによって、第３フランジ７０が位置決めされる。このとき、アタッチメント４１に形成された出口流路４３の軸心ｂ１が下流部４２に形成された出口流路４３の軸心ｂ２と実質的に一致する位置に、第３フランジ７０が位置決めされる。その後、挿通口７５及び挿通口８５にボルトが挿通され、第３フランジ７０と第４フランジ８０とがボルト締結される。 In this way, the third flange 70 is positioned by positioning the third protrusion 73 and the fourth protrusion 74 in the third engagement groove 83 and the fourth engagement groove 84, respectively. At this time, the third flange 70 is positioned at a position where the axis b1 of the outlet flow path 43 formed in the attachment 41 substantially coincides with the axis b2 of the outlet flow path 43 formed in the downstream portion 42. .. After that, bolts are inserted into the insertion openings 75 and 85, and the third flange 70 and the fourth flange 80 are bolted together.

尚、第２フランジ７０の第１フランジ５０への位置決めと、第３フランジ７０の第４フランジ８０への位置決めとは、実質的に同時に行われる。第１突起６３及び第２突起６４の第１係合溝５３及び第２係合溝５４への進入と、第３突起７３及び第４突起７４の第３係合溝８３及び第４係合溝８４への進入とのタイミングがずれていてもよいが、第１係合溝５３及び第２係合溝５４による第１突起６３及び第２突起６４の最終的な位置決めと、第３係合溝８３及び第４係合溝８４による第３突起７３及び第４突起７４の最終的な位置決めとのタイミングは実質的に一致している。すなわち、そうなるように、第１突起６３、第２突起６４、第３突起７３及び第４突起７４、並びに、第１係合溝５３、第２係合溝５４、第３係合溝８３及び第４係合溝８４の形状及び位置が決められている。 The positioning of the second flange 70 on the first flange 50 and the positioning of the third flange 70 on the fourth flange 80 are performed substantially at the same time. The entry of the first protrusion 63 and the second protrusion 64 into the first engagement groove 53 and the second engagement groove 54, and the third engagement groove 83 and the fourth engagement groove of the third protrusion 73 and the fourth protrusion 74. Although the timing of approaching the 84 may be different, the final positioning of the first protrusion 63 and the second protrusion 64 by the first engagement groove 53 and the second engagement groove 54 and the third engagement groove The timing of the final positioning of the third protrusion 73 and the fourth protrusion 74 by the 83 and the fourth engagement groove 84 is substantially the same. That is, the first protrusion 63, the second protrusion 64, the third protrusion 73 and the fourth protrusion 74, and the first engagement groove 53, the second engagement groove 54, the third engagement groove 83 and so on. The shape and position of the fourth engaging groove 84 are determined.

このようにしてアタッチメント４１が取り付けられることによって、ノズル２０の軸心Ａ、出口流路４３のうちアタッチメント４１に形成された部分の軸心ｂ１、及び、出口流路４３のうち下流部４２に形成された部分の軸心ｂ２の軸ずれが低減される。その結果、それらの軸ずれに起因するエゼクタ１０の性能の悪化が低減される。 By attaching the attachment 41 in this way, it is formed in the axial center A of the nozzle 20, the axial center b1 of the portion of the outlet flow path 43 formed in the attachment 41, and the downstream portion 42 of the outlet flow path 43. The misalignment of the axial center b2 of the formed portion is reduced. As a result, the deterioration of the performance of the ejector 10 due to the misalignment of the axes is reduced.

例えば、第１突起６３及び第１係合溝５３等が設けられていない場合、アタッチメント４１を吸引部３０と下流部４２との間にはめ込み、その状態でボルト締結を行う必要がある。その場合には、ボルトの締結作業を行う際に、アタッチメント４１の位置がずれる虞がある。特に、アタッチメント４１が重量物である場合には、その可能性が高くなる。それに対し、前述の第１突起６３及び第１係合溝５３等を設けることによって、アタッチメント４１の位置決めを行った状態でボルトの締結作業を行うことができるので、締結作業時のアタッチメント４１の位置ずれを低減することができる。 For example, when the first protrusion 63, the first engaging groove 53, and the like are not provided, it is necessary to fit the attachment 41 between the suction portion 30 and the downstream portion 42 and fasten the bolt in that state. In that case, the position of the attachment 41 may shift when the bolts are fastened. In particular, when the attachment 41 is a heavy object, the possibility is high. On the other hand, by providing the first protrusion 63, the first engaging groove 53, and the like described above, the bolt can be fastened while the attachment 41 is positioned, so that the position of the attachment 41 during the fastening work can be performed. The deviation can be reduced.

また、第２係合溝５４及び第４係合溝８４の溝幅を、一端側から他端に向かって（即ち、アタッチメント４１の取付時に第２突起６４及び第４突起７４が進入する端部とは反対側の端部に向かって）細くすることによって、第１突起６３及び第１係合溝５３等の製造誤差等があったとしても、アタッチメント４１の位置決めを行うことができる。仮に、係合溝の溝幅が一定であるとすると、係合溝の溝幅を突起の太さよりも、公差等の製造誤差を考慮して広く形成する必要がある。その場合、最終的に係合溝と突起との間にガタツキが残る。それに対し、係合溝の溝幅をしだいに細くすることによって、最終的には突起の移動を係合幅の溝幅で規制することができる。 Further, the groove widths of the second engaging groove 54 and the fourth engaging groove 84 are set from one end side toward the other end (that is, the end portion where the second protrusion 64 and the fourth protrusion 74 enter when the attachment 41 is attached). By making the attachment 41 thinner (toward the end opposite to the end), the attachment 41 can be positioned even if there is a manufacturing error of the first protrusion 63, the first engagement groove 53, or the like. Assuming that the groove width of the engaging groove is constant, it is necessary to form the groove width of the engaging groove wider than the thickness of the protrusion in consideration of manufacturing errors such as tolerances. In that case, rattling remains between the engaging groove and the protrusion in the end. On the other hand, by gradually narrowing the groove width of the engaging groove, the movement of the protrusion can be finally regulated by the groove width of the engaging width.

さらに、第１係合溝５３及び第２係合溝５４を湾曲させることによって、第１フランジ５０と第２フランジ６０との間にガスケット５９を配置することができる。つまり、第１取付面５１は、環状に形成されており、ガスケット５９も環状に形成されている。第１係合溝５３及び第２係合溝５４を配置できるスペースは、第１取付面５１のうちガスケット５９が配置されていない部分であり、その部分の形状も環状である。第１係合溝５３及び第２係合溝５４を湾曲させることによって、限られたスペースの中で十分な長さを有する係合溝を形成することができる。つまり、第１係合溝５３及び第２係合溝５４の長さを十分に確保しつつ、ガスケット５９を配置することができる。 Further, by bending the first engaging groove 53 and the second engaging groove 54, the gasket 59 can be arranged between the first flange 50 and the second flange 60. That is, the first mounting surface 51 is formed in an annular shape, and the gasket 59 is also formed in an annular shape. The space where the first engaging groove 53 and the second engaging groove 54 can be arranged is a portion of the first mounting surface 51 where the gasket 59 is not arranged, and the shape of that portion is also annular. By bending the first engaging groove 53 and the second engaging groove 54, it is possible to form an engaging groove having a sufficient length in a limited space. That is, the gasket 59 can be arranged while sufficiently securing the lengths of the first engaging groove 53 and the second engaging groove 54.

同様に、第３係合溝８３及び第４係合溝８４を湾曲させることによって、第３係合溝８３及び第４係合溝８４の長さを十分に確保しつつ、第３フランジ７０と第４フランジ８０との間にガスケット８９を配置することができる。 Similarly, by bending the third engaging groove 83 and the fourth engaging groove 84, the length of the third engaging groove 83 and the fourth engaging groove 84 is sufficiently secured, and the third flange 70 and the third flange 70 are formed. A gasket 89 can be arranged between the fourth flange 80 and the gasket 89.

以上のように、第１流体を噴出するノズル２０と、ノズル２０からの第１流体の噴出によって生じる負圧により第２流体を吸引する吸引部３０と、吸引部３０に連通する出口流路４３を有し、吸引部３０の第１流体及び第２流体を混合して吐出するディフューザ４０とを備え、ディフューザ４０の一部は、取り換え可能なアタッチメント４１で形成され、アタッチメント４１は、吸引部３０（上流側の固定部材）の第１取付面５１に取り付けられる第２取付面６１を有し、第２取付面６１（第１取付面５１及び第２取付面６１の一方）には、第１突起６３及び第２突起６４が設けられ、第１取付面５１（第１取付面５１及び第２取付面６１の他方）には、アタッチメント４１の取付時に第１突起６３を案内する第１係合溝５３と、アタッチメント４１の取付時に第２突起６４を案内する第２係合溝５４が形成され、第１係合溝５３及び第２係合溝５４の一端は、第２取付面６１を第１取付面５１に対して摺動させながらアタッチメント４１を吸引部３０に取り付けるときに第１突起６３及び第２突起６４が進入するように、吸引部３０（吸引部３０又はアタッチメント４１）の外周面５２に開口しており、第２係合溝５４の溝幅は、一端からしだいに細くなっている。 As described above, the nozzle 20 for ejecting the first fluid, the suction portion 30 for sucking the second fluid by the negative pressure generated by the ejection of the first fluid from the nozzle 20, and the outlet flow path 43 communicating with the suction portion 30. The suction unit 30 is provided with a diffuser 40 that mixes and discharges the first fluid and the second fluid of the suction unit 30, a part of the diffuser 40 is formed by a replaceable attachment 41, and the attachment 41 is the suction unit 30. The second mounting surface 61 to be mounted on the first mounting surface 51 of the (fixing member on the upstream side) is provided, and the first mounting surface 61 (one of the first mounting surface 51 and the second mounting surface 61) has a first mounting surface 61. A protrusion 63 and a second protrusion 64 are provided, and the first mounting surface 51 (the other of the first mounting surface 51 and the second mounting surface 61) is provided with a first engagement that guides the first protrusion 63 when the attachment 41 is mounted. A groove 53 and a second engaging groove 54 for guiding the second protrusion 64 when the attachment 41 is attached are formed, and one end of the first engaging groove 53 and the second engaging groove 54 has a second mounting surface 61. 1 The outer peripheral surface of the suction portion 30 (suction portion 30 or attachment 41) so that the first protrusion 63 and the second protrusion 64 enter when the attachment 41 is attached to the suction portion 30 while sliding with respect to the attachment surface 51. It is open to 52, and the groove width of the second engaging groove 54 is gradually narrowed from one end.

この構成によれば、第１係合溝５３及び第２係合溝５４を、製造誤差等があったとしても第１突起６３及び第２突起６４が摺動可能な幅に形成したとしても、最終的には第２係合溝５４の細くなった部分で第２突起６４の移動を規制し、位置決めを行うことができる。つまり、第１係合溝５３及び第２係合溝５４並びに第１突起６３及び第２突起６４の製造誤差等を吸収しつつ、アタッチメント４１の位置決めを行うことができる。 According to this configuration, even if the first engaging groove 53 and the second engaging groove 54 are formed to have a slidable width even if there is a manufacturing error or the like, the first protrusion 63 and the second protrusion 64 are slidable. Finally, the movement of the second protrusion 64 can be restricted by the narrowed portion of the second engagement groove 54, and positioning can be performed. That is, the attachment 41 can be positioned while absorbing manufacturing errors of the first engaging groove 53 and the second engaging groove 54 and the first protrusion 63 and the second protrusion 64.

また、第１係合溝５３は、湾曲しながら延びる第１湾曲部５３ｂを有し、第２係合溝５４は、湾曲しながら延びる第２湾曲部５４ａを有し、第１湾曲部５３ｂ及び第２湾曲部５４ａは、アタッチメント４１の取付時にアタッチメント４１が第１取付面５１の法線方向に延びる軸回りに回転するように第１突起６３及び第２突起６４を案内する。 Further, the first engaging groove 53 has a first curved portion 53b extending while bending, and the second engaging groove 54 has a second curved portion 54a extending while bending, and the first curved portion 53b and The second curved portion 54a guides the first protrusion 63 and the second protrusion 64 so that the attachment 41 rotates about an axis extending in the normal direction of the first mounting surface 51 when the attachment 41 is attached.

この構成によれば、アタッチメント４１は、直線的に移動させられながら取り付けられるのではなく、回転させられながら取り付けられる。これにより、２つの部材の軸ずれをより低減することができる。例えば、製造誤差等によって第１突起６３及び第２突起６４の第１係合溝５３及び第２係合溝５４内の移動距離にばらつきが生じた場合、アタッチメント４１が直線的に移動する構成（即ち、第１突起６３及び第２突起６４が直線的に移動する構成）では、移動距離のばらつきがそのまま吸引部３０とアタッチメント４１との軸ずれとなるが、アタッチメント４１が回転しながら移動する構成（即ち、第１突起６３及び第２突起６４が弧を描くように移動する構成）では、吸引部３０とアタッチメント４１との軸ずれが移動距離のばらつきよりも小さくなる。 According to this configuration, the attachment 41 is not attached while being linearly moved, but is attached while being rotated. As a result, the misalignment of the two members can be further reduced. For example, when the moving distances in the first engaging groove 53 and the second engaging groove 54 of the first protrusion 63 and the second protrusion 64 vary due to a manufacturing error or the like, the attachment 41 moves linearly (a configuration in which the attachment 41 moves linearly. That is, in the configuration in which the first protrusion 63 and the second protrusion 64 move linearly), the variation in the moving distance directly causes the axial deviation between the suction portion 30 and the attachment 41, but the attachment 41 moves while rotating. (That is, in the configuration in which the first protrusion 63 and the second protrusion 64 move in an arc), the axial deviation between the suction portion 30 and the attachment 41 becomes smaller than the variation in the movement distance.

第２係合溝５４の長さは、第１係合溝５３の長さよりも長い。 The length of the second engaging groove 54 is longer than the length of the first engaging groove 53.

この構成によれば、第２突起６４は、第２係合溝５４内を移動する際に溝幅方向のがたつきが徐々に規制されていく。第２突起６４の溝幅方向のがたつきを急激に規制する構成と比較して、第１係合溝５３及び第２係合溝５４並びに第１突起６３及び第２突起６４の製造誤差等をより吸収することができる。 According to this configuration, when the second protrusion 64 moves in the second engaging groove 54, the rattling in the groove width direction is gradually regulated. Compared with the configuration that rapidly regulates the rattling of the second protrusion 64 in the groove width direction, the manufacturing error of the first engagement groove 53 and the second engagement groove 54 and the first protrusion 63 and the second protrusion 64, etc. Can be absorbed more.

第１係合溝５３は、一端から第１湾曲部５３ｂまで延びる第１導入部５３ａをさらに有し、第１導入部５３ｂと第１湾曲部５３ａとの第１接続部５３ｃで屈曲している。 The first engaging groove 53 further has a first introduction portion 53a extending from one end to the first curved portion 53b, and is bent at the first connecting portion 53c between the first introduction portion 53b and the first curved portion 53a. ..

第１係合溝５３が第２係合溝５４よりも短く、且つ、アタッチメント４１が第１取付面５１の法線方向に延びる軸回りに回転しながら取り付けられる構成においては、第１係合溝５３に案内される第１突起６３は、アタッチメント４１の回転軸（又は揺動軸）のような機能を有している。第１係合溝５３を屈曲させることによって、第１湾曲部５３ａまで進入した第１突起６３が第１係合溝５３から抜け出にくくすることができる。その結果、回転させながらのアタッチメント４１の取付を安定して行うことができる。 In a configuration in which the first engaging groove 53 is shorter than the second engaging groove 54 and the attachment 41 is mounted while rotating around an axis extending in the normal direction of the first mounting surface 51, the first engaging groove The first protrusion 63 guided by 53 has a function like a rotation shaft (or swing shaft) of the attachment 41. By bending the first engaging groove 53, it is possible to prevent the first protrusion 63 that has entered the first curved portion 53a from coming out of the first engaging groove 53. As a result, the attachment 41 can be stably attached while rotating.

アタッチメント４１は、出口流路４３の上流端部を含んでおり、ディフューザ４０は、アタッチメント４１と、アタッチメント４１の下流側に位置し、アタッチメント４１が取り付けられる下流部４２（下流側の固定部材）とに分割されており、下流部４２は、アタッチメント４１が取り付けられる第４取付面８１を有し、アタッチメント４１は、第４取付面８１に取り付けられる第３取付面７１をさらに有し、第３取付面７１（第３取付面７１及び第４取付面８１の一方）には、第３突起７３及び第４突起７４が設けられ、第４取付面８１（第３取付面７１及び第４取付面８１の他方）には、アタッチメント４１の取付時に第３突起７３を案内する第３係合溝８３と、アタッチメント４１の取付時に第４突起７４を案内する第４係合溝８４が形成され、第３係合溝８３及び第４係合溝８４の一端は、第２取付面６１を第１取付面５１に対して摺動させながらアタッチメント４１を吸引部３０に取り付け且つ第３取付面７１を第４取付面８１に対して摺動させながらアタッチメント４１を下流部４２に取り付けるときに第３突起７３及び第４突起７４が進入するように、下流部４２（アタッチメント４１又は下流部４２）の外周面８２に開口しており、第４係合溝８４の溝幅は、一端からしだいに細くなっている。 The attachment 41 includes an upstream end portion of the outlet flow path 43, and the diffuser 40 is located on the downstream side of the attachment 41 and the attachment 41, and has a downstream portion 42 (a fixing member on the downstream side) to which the attachment 41 is attached. The downstream portion 42 has a fourth mounting surface 81 to which the attachment 41 is mounted, and the attachment 41 further has a third mounting surface 71 to be mounted to the fourth mounting surface 81, and the third mounting A third protrusion 73 and a fourth protrusion 74 are provided on the surface 71 (one of the third mounting surface 71 and the fourth mounting surface 81), and the fourth mounting surface 81 (third mounting surface 71 and the fourth mounting surface 81) is provided. A third engaging groove 83 that guides the third protrusion 73 when the attachment 41 is attached and a fourth engaging groove 84 that guides the fourth protrusion 74 when the attachment 41 is attached are formed in the third. One end of the engaging groove 83 and the fourth engaging groove 84 attaches the attachment 41 to the suction portion 30 while sliding the second mounting surface 61 with respect to the first mounting surface 51, and attaches the third mounting surface 71 to the fourth. The outer peripheral surface 82 of the downstream portion 42 (attachment 41 or downstream portion 42) so that the third protrusion 73 and the fourth protrusion 74 enter when the attachment 41 is attached to the downstream portion 42 while sliding with respect to the attachment surface 81. The groove width of the fourth engaging groove 84 is gradually narrowed from one end.

この構成によれば、アタッチメント４１の下流側も上流側と同様に、第３係合溝８３及び第４係合溝８４並びに第３突起７３及び第４突起７４の製造誤差等を吸収しつつ、アタッチメント４１の位置決めを行うことができる。その結果、アタッチメント４１の下流側においても高い位置決め精度で取付を行うことができる。 According to this configuration, the downstream side of the attachment 41 also absorbs manufacturing errors of the third engaging groove 83 and the fourth engaging groove 84 and the third protrusion 73 and the fourth protrusion 74 as well as the upstream side. The attachment 41 can be positioned. As a result, mounting can be performed with high positioning accuracy even on the downstream side of the attachment 41.

また、第３係合溝８３は、湾曲しながら延びる第３湾曲部８３ｂを有し、第４係合溝８４は、湾曲しながら延びる第４湾曲部８４ａを有し、第１湾曲部５３ｂ、第２湾曲部５４ａ、第３湾曲部８３ｂ及び第４湾曲部８４ａは、アタッチメント４１の取付時にアタッチメント４１が第１取付面５１の法線方向に延びる軸回りに回転するように第１突起６３、第２突起６４、第３突起７３及び第４突起７４をそれぞれ案内する。 Further, the third engaging groove 83 has a third curved portion 83b extending while bending, and the fourth engaging groove 84 has a fourth curved portion 84a extending while bending, and the first curved portion 53b, The second curved portion 54a, the third curved portion 83b, and the fourth curved portion 84a have the first protrusion 63, so that the attachment 41 rotates about an axis extending in the normal direction of the first attachment surface 51 when the attachment 41 is attached. The second protrusion 64, the third protrusion 73, and the fourth protrusion 74 are guided, respectively.

この構成によれば、アタッチメント４１の取付時に、アタッチメント４１は、下流側においても第１取付面５１の法線方向に延びる軸回りに回転するように案内される。 According to this configuration, when the attachment 41 is attached, the attachment 41 is guided to rotate about an axis extending in the normal direction of the first attachment surface 51 even on the downstream side.

さらに、第４係合溝８４の長さは、第３係合溝８３の長さよりも長い。 Further, the length of the fourth engaging groove 84 is longer than the length of the third engaging groove 83.

この構成によれば、アタッチメント４１の上流側と同様に、第４突起７４は、第４係合溝８４内を移動する際に溝幅方向のがたつきが徐々に規制されていくので、第３係合溝８３及び第４係合溝８４並びに第３突起７３及び第４突起７４の製造誤差等をより吸収することができる。 According to this configuration, as in the case of the upstream side of the attachment 41, the fourth protrusion 74 is gradually regulated from rattling in the groove width direction when moving in the fourth engaging groove 84. It is possible to better absorb manufacturing errors and the like of the three engaging grooves 83, the fourth engaging groove 84, and the third protrusion 73 and the fourth protrusion 74.

また、第３係合溝８３は、一端から第３湾曲部８３ｂまで延びる第３導入部８３ａをさらに有し、第３導入部８３ｂと第３湾曲部８３ａとの第３接続部８３ｃで屈曲している。 Further, the third engaging groove 83 further has a third introduction portion 83a extending from one end to the third curved portion 83b, and is bent at the third connecting portion 83c between the third introduction portion 83b and the third curved portion 83a. ing.

この構成によれば、アタッチメント４１の上流側と同様に、アタッチメント４１の回転軸（又は揺動軸）のような機能を有する第３突起７３を第３係合溝７３から抜け出にくくすることができる。その結果、回転させながらのアタッチメント４１の取付を安定して行うことができる。 According to this configuration, it is possible to make it difficult for the third protrusion 73, which has a function like the rotation shaft (or swing shaft) of the attachment 41, to come out of the third engagement groove 73, similarly to the upstream side of the attachment 41. .. As a result, the attachment 41 can be stably attached while rotating.

《その他の実施形態》
以上のように、本出願において開示する技術の例示として、前記実施形態を説明した。しかしながら、本開示における技術は、これに限定されず、適宜、変更、置き換え、付加、省略などを行った実施の形態にも適用可能である。また、前記実施形態で説明した各構成要素を組み合わせて、新たな実施の形態とすることも可能である。また、添付図面および詳細な説明に記載された構成要素の中には、課題解決のために必須な構成要素だけでなく、前記技術を例示するために、課題解決のためには必須でない構成要素も含まれ得る。そのため、それらの必須ではない構成要素が添付図面や詳細な説明に記載されていることをもって、直ちに、それらの必須ではない構成要素が必須であるとの認定をするべきではない。 << Other Embodiments >>
As described above, the above-described embodiment has been described as an example of the technology disclosed in the present application. However, the technique in the present disclosure is not limited to this, and can be applied to embodiments in which changes, replacements, additions, omissions, etc. are made as appropriate. It is also possible to combine the components described in the above embodiment to form a new embodiment. In addition, among the components described in the attached drawings and detailed explanations, not only the components essential for problem solving but also the components not essential for problem solving in order to illustrate the above-mentioned technology. Can also be included. Therefore, the fact that these non-essential components are described in the accompanying drawings or detailed description should not immediately determine that those non-essential components are essential.

前記実施形態について、以下のような構成としてもよい。 The embodiment may have the following configuration.

ディフューザ４０は、２分割構造であるが、３つ以上の分割構造であってもよい。例えば、ディフューザ４０は、上流部とアタッチメント４１と下流部４２とを含む分割構造となっていてもよい。また、ディフューザ４０は、分割されていなくてもよい。その場合、上流側の固定部材は、前記実施形態と同様に吸引部３０であり、下流側の固定部材は、流出配管９３である。 The diffuser 40 has a two-divided structure, but may have three or more divided structures. For example, the diffuser 40 may have a divided structure including an upstream portion, an attachment 41, and a downstream portion 42. Further, the diffuser 40 does not have to be divided. In that case, the fixing member on the upstream side is the suction portion 30 as in the above embodiment, and the fixing member on the downstream side is the outflow pipe 93.

アタッチメント４１の上流側において、第１係合溝５３及び第２係合溝５４が第１フランジ５０に形成され、第１突起６３及び第２突起６４が第２フランジ６０に設けられているが、第１係合溝５３及び第２係合溝５４が第２フランジ６０に形成され、第１突起６３及び第２突起６４が第１フランジ５０に設けられていてもよい。 On the upstream side of the attachment 41, the first engaging groove 53 and the second engaging groove 54 are formed on the first flange 50, and the first protrusion 63 and the second protrusion 64 are provided on the second flange 60. The first engaging groove 53 and the second engaging groove 54 may be formed on the second flange 60, and the first protrusion 63 and the second protrusion 64 may be provided on the first flange 50.

同様に、アタッチメント４１の下流側において、第３係合溝８３及び第４係合溝８４が第４フランジ８０に形成され、第３突起７３及び第４突起７４が第３フランジ７０に設けられているが、第３係合溝８３及び第４係合溝８４が第３フランジ７０に形成され、第３突起７３及び第４突起７４が第４フランジ８０に設けられていてもよい。 Similarly, on the downstream side of the attachment 41, the third engaging groove 83 and the fourth engaging groove 84 are formed on the fourth flange 80, and the third protrusion 73 and the fourth protrusion 74 are provided on the third flange 70. However, the third engaging groove 83 and the fourth engaging groove 84 may be formed on the third flange 70, and the third protrusion 73 and the fourth protrusion 74 may be provided on the fourth flange 80.

また、ディフューザ４０においては、アタッチメント４１の上流側の取付構造として、第１係合溝５３及び第２係合溝５４並びに第１突起６３及び第２突起６４が設けられ、アタッチメント４１の下流側の取付構造として、第３係合溝８３及び第４係合溝８４並びに第３突起７３及び第４突起７４が設けられているが、アタッチメント４１の上流側及び下流側の何れか一方だけに係合溝と突起が設けられていてもよい。つまり、アタッチメント４１の上流側及び下流側の何れか一方だけの位置決め精度が向上するだけでも、軸ずれに起因するエゼクタ１０の性能の悪化を低減することができる。尚、その場合には、ディフューザ４０の上流側の方が軸ずれの悪影響が大きいので、アタッチメント４１の上流側に係合溝及び突起を設けることが好ましい。 Further, in the diffuser 40, as a mounting structure on the upstream side of the attachment 41, a first engaging groove 53 and a second engaging groove 54 and a first protrusion 63 and a second protrusion 64 are provided, and the downstream side of the attachment 41 is provided. As a mounting structure, a third engaging groove 83 and a fourth engaging groove 84, and a third protrusion 73 and a fourth protrusion 74 are provided, but they are engaged only on either the upstream side or the downstream side of the attachment 41. Grooves and protrusions may be provided. That is, even if the positioning accuracy of only one of the upstream side and the downstream side of the attachment 41 is improved, the deterioration of the performance of the ejector 10 due to the misalignment can be reduced. In that case, it is preferable to provide an engaging groove and a protrusion on the upstream side of the attachment 41 because the adverse effect of the shaft shift is larger on the upstream side of the diffuser 40.

さらに、第１係合溝５３及び第３係合溝８３は、屈曲しているが、屈曲していなくてもよい。また、第１係合溝５３及び第３係合溝８３の溝幅は、第２係合溝５４及び第４係合溝８４のように、他端に向かって細くなっていてもよい。 Further, the first engaging groove 53 and the third engaging groove 83 are bent, but may not be bent. Further, the groove widths of the first engaging groove 53 and the third engaging groove 83 may be narrowed toward the other end like the second engaging groove 54 and the fourth engaging groove 84.

尚、前記実施形態は、エゼクタ１０であるが、ここに開示された取付構造は、エゼクタに限られるものではない。ここに開示された取付構造は、アタッチメントを取付面と平行にスライドさせて取り付けなければならない２つの部材の取付構造に適用することができる。つまり、ここに開示された取付構造は、第１部材とアタッチメントとを取り付ける取付構造であって、第１部材は、アタッチメントが取り付けられる第１取付面を有し、アタッチメントは、第１取付面に取り付けられる第２取付面を有し、第１取付面及び第２取付面の一方には、第１突起及び第２突起が形成され、第１取付面及び第２取付面の他方には、アタッチメントの取付時に第１突起を案内する第１係合溝と、アタッチメントの取付時に第２突起を案内する第２係合溝が形成され、第１係合溝及び第２係合溝の一端は、第２取付面を第１取付面に対して摺動させながらアタッチメントを第１部材に取り付けるときに第１突起及び第２突起が進入するように、第１部材又はアタッチメントの外周面に開口しており、第２係合溝の溝幅は、前記一端からしだいに細くなっている。ここでいう「アタッチメント」、「第１取付面」、「第２取付面」、「第１突起」、「第２突起」、「第１係合溝」及び「第２係合溝」は、エゼクタ１０における、同じ名称の構成に限定されるものではない。 Although the embodiment is an ejector 10, the mounting structure disclosed here is not limited to the ejector. The mounting structure disclosed herein can be applied to a mounting structure of two members in which the attachment must be slid parallel to the mounting surface. That is, the mounting structure disclosed here is a mounting structure for mounting the first member and the attachment, the first member has a first mounting surface to which the attachment is mounted, and the attachment is attached to the first mounting surface. It has a second mounting surface to be mounted, a first protrusion and a second protrusion are formed on one of the first mounting surface and the second mounting surface, and an attachment is formed on the other of the first mounting surface and the second mounting surface. A first engaging groove for guiding the first protrusion and a second engaging groove for guiding the second protrusion when the attachment is attached are formed, and one end of the first engaging groove and the second engaging groove is formed. Open the outer peripheral surface of the first member or the attachment so that the first protrusion and the second protrusion enter when the attachment is attached to the first member while sliding the second mounting surface with respect to the first mounting surface. The groove width of the second engaging groove is gradually narrowed from one end thereof. The "attachment", "first mounting surface", "second mounting surface", "first protrusion", "second protrusion", "first engaging groove" and "second engaging groove" referred to here are The structure of the ejector 10 is not limited to the same name.

１０エゼクタ
２０ノズル
３０吸引部（上流側の固定部材）
４０ディフューザ
４１アタッチメント
４２下流部（下流側の固定部材）
４３出口流路
５１第１取付面
５２外周面
５３第１係合溝
５３ａ第１導入部
５３ｂ第１湾曲部
５３ｃ第１接続部
５４第２係合溝
５４ａ第２湾曲部
６１第２取付面
６３第１突起
６４第２突起
７１第３取付面
７３第３突起
７４第４突起
８１第４取付面
８２外周面
８３第３係合溝
８４第４係合溝 10 Ejector 20 Nozzle 30 Suction part (fixing member on the upstream side)
40 Diffuser 41 Attachment 42 Downstream (fixing member on the downstream side)
43 Outlet flow path 51 First mounting surface 52 Outer peripheral surface 53 First engaging groove 53a First introduction portion 53b First curved portion 53c First connecting portion 54 Second engaging groove 54a Second curved portion 61 Second mounting surface 63 1st protrusion 64 2nd protrusion 71 3rd mounting surface 73 3rd protrusion 74 4th protrusion 81 4th mounting surface 82 Outer peripheral surface 83 3rd engagement groove 84 4th engagement groove

Claims

A nozzle that ejects the first fluid and
A suction unit that sucks the second fluid by the negative pressure generated by the ejection of the first fluid from the nozzle.
It has an outlet flow path that communicates with the suction unit, and includes a diffuser that mixes and discharges the first fluid and the second fluid of the suction unit.
All or part of the diffuser is formed with replaceable attachments.
The attachment has a second mounting surface that is attached to the first mounting surface of the fixing member on the upstream side.
The attachment is a fixing member on the upstream side while sliding the second mounting surface on the first mounting surface without moving in the normal direction of the first mounting surface with respect to the fixing member on the upstream side. It is configured to be removable to
A first protrusion and a second protrusion are provided on one of the first mounting surface and the second mounting surface.
On the other side of the first mounting surface and the second mounting surface, there is a first engaging groove that guides the first protrusion when the attachment is mounted, and a second engagement that guides the second protrusion when the attachment is mounted. A groove is formed,
The first engaging groove and one end of the second engaging groove are the first when the attachment is attached to the fixing member on the upstream side while sliding the second mounting surface with respect to the first mounting surface. The fixing member on the upstream side or the outer peripheral surface of the attachment is opened so that the first protrusion and the second protrusion can enter.
The groove width of the second engaging groove is gradually narrowed from one end thereof.
The first engaging groove has a first curved portion which is a groove extending while being curved.
The second engaging groove has a second curved portion which is a groove extending while being curved.
The first curved portion and the second curved portion guide the first protrusion and the second protrusion so that the attachment rotates about an axis extending in the normal direction of the first mounting surface when the attachment is attached. An ejector characterized by doing.

A nozzle that ejects the first fluid and
A suction unit that sucks the second fluid by the negative pressure generated by the ejection of the first fluid from the nozzle.
It has an outlet flow path that communicates with the suction unit, and includes a diffuser that mixes and discharges the first fluid and the second fluid of the suction unit.
All or part of the diffuser is formed with replaceable attachments.
The attachment has a second mounting surface that is attached to the first mounting surface of the fixing member on the upstream side.
A first protrusion and a second protrusion are provided on one of the first mounting surface and the second mounting surface.
On the other side of the first mounting surface and the second mounting surface, there is a first engaging groove that guides the first protrusion when the attachment is mounted, and a second engagement that guides the second protrusion when the attachment is mounted. A groove is formed,
The first engaging groove and one end of the second engaging groove are the first when the attachment is attached to the fixing member on the upstream side while sliding the second mounting surface with respect to the first mounting surface. The fixing member on the upstream side or the outer peripheral surface of the attachment is opened so that the first protrusion and the second protrusion can enter.
The groove width of the second engaging groove is gradually narrowed from one end thereof.
Said first engaging groove comprises a first curved portion is a groove extending while being curved, and a first inlet portion extending from said one end to said first curved portion, the first curved and the first introduction part It is bent at the connection with the part,
The second engaging groove has a second curved portion which is a groove extending while being curved.
The first curved portion and the second curved portion guide the first protrusion and the second protrusion so that the attachment rotates about an axis extending in the normal direction of the first mounting surface when the attachment is attached. An ejector characterized by doing.

In the ejector according to claim 1 or 2.
An ejector characterized in that the length of the second engaging groove is longer than the length of the first engaging groove.

In the ejector according to claim 1,
The attachment includes the upstream end of the outlet flow path.
The diffuser is divided into the attachment and a fixing member located on the downstream side of the attachment and on the downstream side to which the attachment is attached.
The fixing member on the upstream side is the suction portion.
The first mounting surface is formed on the suction portion.
The downstream fixing member has a fourth mounting surface to which the attachment is mounted.
The attachment further has a third mounting surface that is mounted to the fourth mounting surface.
A third protrusion and a fourth protrusion are provided on one of the third mounting surface and the fourth mounting surface.
On the other side of the third mounting surface and the fourth mounting surface, there is a third engaging groove that guides the third protrusion when the attachment is mounted, and a fourth engagement that guides the fourth protrusion when the attachment is mounted. A groove is formed,
The third engaging groove and one end of the fourth engaging groove attach the attachment to the suction portion while sliding the second mounting surface with respect to the first mounting surface, and attach the third mounting surface to the suction portion. The attachment or the downstream fixing member so that the third protrusion and the fourth protrusion enter when the attachment is attached to the downstream fixing member while sliding with respect to the fourth mounting surface. It has an opening on the outer peripheral surface,
The groove width of the fourth engaging groove is gradually narrowed from one end thereof.
The first engaging groove has a first curved portion which is a groove extending while being curved.
The second engaging groove has a second curved portion which is a groove extending while being curved.
The third engaging groove has a third curved portion which is a groove extending while being curved.
The fourth engaging groove has a fourth curved portion which is a groove extending while being curved.
The first curved portion, the second curved portion, the third curved portion, and the fourth curved portion rotate about an axis extending in the normal direction of the first mounting surface when the attachment is attached. An ejector characterized in that it guides the first protrusion, the second protrusion, the third protrusion, and the fourth protrusion, respectively.

In the ejector according to claim 4,
The first engaging groove further has a first introduction portion extending from one end to the first curved portion, and is bent at a connecting portion between the first introduction portion and the first curved portion.
The third engaging groove further has a third introduction portion extending from one end to the third curved portion, and is bent at a connecting portion between the third introduction portion and the third curved portion. Ejector to be.

In the ejector according to claim 4 or 5,
The length of the second engaging groove is longer than the length of the first engaging groove.
An ejector characterized in that the length of the fourth engaging groove is longer than the length of the third engaging groove.

It is a mounting structure that attaches the first member and the attachment.
The first member has a first mounting surface to which the attachment is mounted.
The attachment has a second mounting surface that is mounted on the first mounting surface.
A first protrusion and a second protrusion are formed on one of the first mounting surface and the second mounting surface.
On the other side of the first mounting surface and the second mounting surface, there is a first engaging groove that guides the first protrusion when the attachment is mounted, and a second engagement that guides the second protrusion when the attachment is mounted. A groove is formed,
The first engaging groove and one end of the second engaging groove are the first protrusions when the attachment is attached to the first member while sliding the second mounting surface with respect to the first mounting surface. And the outer peripheral surface of the first member or the attachment is opened so that the second protrusion can enter.
The groove width of the second engaging groove is gradually narrowed from one end thereof.
The first engaging groove has a first curved portion which is a groove extending while being curved, and a first introduction portion extending from one end of the first curved portion to the first curved portion , and the first introduction portion and the first curved portion. It is bent at the connection with the part,
The second engaging groove has a second curved portion which is a groove extending while being curved.
The first curved portion and the second curved portion guide the first protrusion and the second protrusion so that the attachment rotates about an axis extending in the normal direction of the first mounting surface when the attachment is attached. A mounting structure characterized by