Ejector

Abstract

To provide an ejector that is easy to handle so that workers at a production site can frequently clean it. [Solution] The ejector of the present invention has a discharge port that discharges fluid from the inside, a vacuum port that generates negative pressure, a main body to which fluid is supplied and which is connected to the discharge port and the vacuum port, with at least one of the ports being detachably connected, and a coupling member that couples the detachable port to the main body, and the coupling member can switch the detachable port between a connected state and a released state by an operator's operation without using any tools.

Description

[Technical Field]

[0001] The present invention relates to an ejector that supplies a fluid or the like to create negative pressure at a port opening, and more particularly to an ejector in which a port is detachably attached to a main body. [Background technology]

[0002] When moving processed food products, agricultural crops, etc., an adsorption mechanism that utilizes negative pressure may be used. One example of a device that generates such negative pressure is an ejector that is equipped with a fluid supply port through which a fluid is supplied, a discharge port through which the fluid is discharged, and a vacuum port through which a vacuum (negative pressure) is obtained.

[0003] For example, when transporting processed foods at a processing factory or other site, the ejector is operated to suck up the target processed food at a vacuum port that generates negative pressure, the processed food is moved while held in place by an actuator, and the suction of the processed food is released at the desired destination, allowing the processed food to be transported to the desired location. However, in the case of processed foods, fragments and fluids containing contents sometimes remain inside the ejector, which in the case of food can become a breeding ground for bacteria that grow from the residue, and frequent cleaning is required to prevent this.

[0004] In order to accommodate such frequent cleaning work, it is preferable that the ejector itself, which is mainly composed of a cylindrical pole incorporated into the main body, be disassembled.In addition, although the ejector is not disassembled, a structure in which the piping connected to the ejector can be easily detached is also known (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Publication No. 10-184598 Summary of the Invention [Problem to be solved by the invention]

[0006] Incidentally, the technology in Patent Document 1 is described as a technology for attaching and detaching piping mainly using a U-shaped lock pin, but does not disclose a technology for disassembling the ejector itself to make cleaning easier, and there has been a demand for a device that is easy to handle so that workers at production sites can frequently clean it.

[0007] SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide an ejector that is easy to handle so that workers at the production site can frequently clean it. [Means for solving the problem]

[0008] In view of the above-mentioned technical problems, the present invention provides an ejector having a discharge port for discharging a fluid from inside, a vacuum port for generating a negative pressure, a main body to which a fluid is supplied and which is connected to the discharge port and the vacuum port, with at least one of the ports being detachably connected, and a coupling member for coupling the detachable port to the main body, the coupling member being capable of switching the detachable port between a coupled state and a released state by an operator's operation without using any tools. In the released state, the port is detached from the main body. It is characterized by the following.

[0009] The coupling member has the function of coupling the detachable port to the main body and is configured to be able to switch the port between a coupled state and a disengaged state relative to the main body, and in particular, the operation between the coupled state and the disengaged state can be performed by an operator without using any tools. Here, in this specification, "operation without using any tools by an operator" mainly refers to the ability to operate the coupling member using the operator's hands, etc., but does not prohibit the operator from operating the coupling member using tools. The coupling member may be one that can be operated by the operator's hands and also by tools. In a preferred embodiment, examples of such a coupling member include a snap lock, a butterfly screw, or a coupling mechanism that utilizes the elasticity of other materials, a strong magnet such as neodymium, or a cable tie. However, in addition to being able to be operated by the operator's hands, it must also not be easily disengaged when in the coupled state. A structure that easily comes off due to physical contact with something cannot be considered a sufficient member.

[0010] According to a preferred embodiment, the connecting member can be configured to consist of a pair of brackets that engage with the port or the main body, and a snap lock or the like that is attached to bridge the pair of brackets, and further, a key groove can be provided on the outer periphery of the port that engages with the pair of brackets, and a portion of the pair of brackets can be fitted into the key groove.

[0011] Another ejector of the present invention includes a fluid supply port to which a fluid is supplied, a discharge port to discharge the fluid from inside, a vacuum port to generate negative pressure, a body connected to the fluid supply port, the discharge port, and the vacuum port and detachably connected to at least one of the ports, and a coupling member for coupling the detachable port to the body, wherein the coupling member can switch the detachable port between a coupled state and a released state by an operator's operation without using any tool. In the released state, the port is detached from the main body. It is characterized by the following.

[0012] Although this ejector differs from the previously described ejector in that the location where the fluid is supplied is a fluid supply port, the definition of "operation without the use of operator tools" is the same. In another ejector of the present invention, the coupling member may be an openable / closable clamp member, and a thumb screw mechanism may be provided at the openable / closable end of the clamp member, and the vacuum port may be integrally connected to the main body. In another ejector of the present invention, the main body may incorporate a multi-stage diffuser, and the main body may be separable into each stage of the diffuser, and the separated main body stages may also be connected by a coupling member. [Brief explanation of the drawings]

[0013] [Figure 1] 1 is a perspective view of an ejector according to a first embodiment of the present invention. FIG. [Figure 2] 1 is a cross-sectional view of an ejector according to a first embodiment of the present invention. [Figure 3] FIG. 1 is an exploded perspective view of an ejector according to a first embodiment of the present invention. [Figure 4] FIG. 2 is a side view of the ejector according to the first embodiment of the present invention, showing the state in which the snap lock is engaged. [Figure 5] FIG. 2 is a side view of the ejector according to the first embodiment of the present invention, showing the release state of the snap lock. [Figure 6] FIG. 10 is a perspective view of an ejector according to a second embodiment of the present invention. [Figure 7] FIG. 4 is a cross-sectional view of an ejector according to a second embodiment of the present invention. [Figure 8] FIG. 10 is an exploded perspective view of an ejector according to a second embodiment of the present invention. [Figure 9] FIG. 10 is a side view of an ejector according to a second embodiment of the present invention, showing a clamp engagement state. [Figure 10] FIG. 10 is a side view of an ejector according to a second embodiment of the present invention, showing a clamp in a released state. DETAILED DESCRIPTION OF THE INVENTION

[0014] An ejector according to a first embodiment and an ejector according to a second embodiment of the present invention will be described with reference to the drawings. The ejector according to the first embodiment is a large flow rate type, and the ejector according to the second embodiment is a multi-stage flow rate type. In addition, in this specification, "vacuum" does not refer to a physical vacuum state, but rather to a general negative pressure state where the pressure is lower than atmospheric pressure.

[0015] 1 to 3, an ejector 10 of the first embodiment has an exhaust port 14 that exhausts fluid from the interior, a vacuum port 16 that generates negative pressure, a main body 12 to which fluid is supplied, and a pair of exhaust-side and vacuum-side brackets 18, 20 that serve as coupling members that detachably couple the ports 14, 16 to the main body 12. The ejector 10 of the first embodiment has main structural components made of stainless steel, and in particular has a structure that suppresses dust generation because there are no rotating moving parts in the entire fluid flow path.

[0016] The main body 12, to which the fluid is supplied, is a generally hollow, cubic stainless steel member. A drain port 14 for discharging the fluid is detachably attached to the top side, and a vacuum port 16 for generating negative pressure is detachably attached to the bottom side. A fluid supply pipe (not shown) is connected to a central hole 22 on one of the six side surfaces, and the central hole 22 functions as a fluid inlet for introducing the fluid into the main body 12. The drain port 14 and the vacuum port 16 can be fitted together inside the main body 12 so that they face each other closely, and as shown in Figure 2, negative pressure is generated on the vacuum port 16 side by the Venturi effect. A fitting hole 24 for the drain port 14 is provided on the top surface of the main body 12. When connected, the drain port 14 is pushed downward along the axial direction together with an O-ring 26 to fit. Similarly, a fitting hole 28 for the vacuum port 16 is provided on the bottom surface of the main body 12, and when connected, the vacuum port 16 is pushed upward along the axial direction together with the O-ring 30 to fit. The O-rings 26 and 30 are each made of a metal-blended silicone material that complies with the Food Sanitation Act, and are highly heat-resistant and can be sterilized by boiling or with hypochlorous acid, making it possible to configure an ejector that is particularly suitable for conveying food.

[0017] The discharge port 14 is a generally cylindrical stainless steel member that is detachably fitted into a fitting hole 24 in the main body 12. When fitted into the main body 12, the shape of the fitted end generates a positive pressure on the upper end of the discharge port 14 and a negative pressure on the lower end of the discharge port. When the discharge port 14 is fitted into the main body 12, an O-ring 26 is used. In particular, the outer periphery of the discharge port 14 is provided with a pair of keyways 31 extending perpendicular to the axial direction of the ejector. In the coupled state, a U-shaped notched end 32 of the discharge-side bracket 20 is fitted into these keyways 31. More specifically, when the discharge-side bracket 20, which is in a detached state in the released state, transitions to the coupled state, the discharge port 14 is fitted into the main body 12 to a predetermined depth, and the U-shaped notched end 32 of the discharge-side bracket 20 is slidably guided into the keyways 31. At the same time, the bracket lower surface 34 of the discharge-side bracket 20 and the upper surface 13u of the main body 12 approach each other.

[0018] Similarly, the vacuum port 16 is a generally cylindrical stainless steel member that is detachably fitted into a fitting hole 28 in the main body 12. When fitted into the main body 12, the negative pressure generated inside the main body 12 extends to the underside of the vacuum port 16. When the vacuum port 16 is fitted into the main body 12, an O-ring 30 is used. In particular, the outer periphery of the vacuum port 16 is provided with a pair of keyways 33 extending perpendicular to the axial direction of the ejector. In the engaged state, a U-shaped notched end 35 of the vacuum-side bracket 18 fits into these keyways 33. More specifically, when the vacuum-side bracket 18, which is in a disengaged state in the released state, transitions to the engaged state, the vacuum port 14 is fitted into the main body 12 to a predetermined depth, and the U-shaped notched end 35 of the vacuum-side bracket 18 is slidably guided into the keyways 33. At the same time, the bracket top surface 36 of the vacuum-side bracket 18 and the bottom surface 13b of the main body 12 approach each other.

[0019] The discharge side bracket 20 and the vacuum side bracket 18 constitute a connecting member. The discharge port 14 and the vacuum port 16 are positioned relative to the main body 12 by the fitting and abutting relationships between the pair of key grooves 31, 33, the discharge side bracket 20 and the vacuum side bracket 18, and the top surface 13u and bottom surface 13b of the main body 12, respectively. However, there is no restriction on how the discharge port 14 and the vacuum port 16 can be removed from the main body. Therefore, in this embodiment, snap locks 40, 40 are provided to bridge the pair of brackets 20, 18.

[0020] The snap locks 40, 40 have, on the vacuum-side bracket 18 side, a rotating piece 42 for operation, a pin 43 that penetrates a pair of rotating support pieces rising from the vacuum-side bracket 18 and serves as the rotation center of the rotating piece 42, and a hook 44 that is rotatably arranged radially outward of the pin 43. The rotating piece 42, hook 44, and pin 43 are arranged in pairs on both sides of the U-shaped notch end 35. The snap locks 40, 40 also have, on the discharge-side bracket 20 side, a pair of engaging pieces 41, 41 rising from the discharge-side bracket 20 that engage with the hook 44 when connected, and each engaging piece 41 has an engaging groove 45 at its tip. The engaging pieces 41, 41 are also arranged in pairs on both sides of the U-shaped notch end 32. The hook 44 extends in an arc from the rotation center to a hook tip 46 that is parallel to the pin 43.

[0021] To connect the snap lock 40, considering the disassembled components, first engage the discharge-side bracket 20 and the vacuum-side bracket 18 with the main body 12 using the keyways 31 and 33. Then, rotate the pivot piece 42 upward until it is positioned between the hooks 44, allowing the hooks 44 to engage with the engagement grooves 45 at the tips of the engagement piece 41. After the hooks 44 are locked, rotate the pivot piece 42 downward. The elastic deformation of the arc-shaped metal portion of the hook 44 urges the hook 44 in a direction that further engages with the engagement grooves 45. Finally, as shown in Figure 4, the hooks 44 stop engaging with the engagement grooves 45, completing the connection between the pair of snap locks 40. The connection of the snap lock 40 can be performed by an operator without the use of any tools, and no special jigs or tools are required. The force of the hook 44 presses the discharge side bracket 20 and the vacuum side bracket 18 against the main body 12 in a direction narrowing the gap between them in the axial direction, causing the end faces of the discharge port 14 and the vacuum port 16 to abut, and positioning the ejector in the axial direction, so that the ejector 10 of this embodiment maintains its combined state as a whole.

[0022] Similarly, to release the snap lock 40 from the engaged state, rotating the pivot piece 42 upward urges the hook 44 in a direction that engages more closely with the engagement groove 45, thereby disengaging the previously secured engagement, as shown in Figure 5. By releasing the engaged state with both snap locks 40, 40 and then sliding the discharge-side bracket 20 and the vacuum-side bracket 18 along the keyways 31, 33, the discharge-side bracket 20 and the vacuum-side bracket 18 can be removed. As a result, the ejector 10 of this embodiment can be disassembled into the main body 12, the discharge port 14 and vacuum port 16, the discharge-side bracket 20, and the vacuum-side bracket 18. This facilitates disassembly of each component, even when, for example, frequent cleaning of the inside of the ejector 10 is required.

[0023] Next, an ejector 50 according to a second embodiment of the present invention will be described with reference to FIGS. 6 to 8. The ejector 50 of the second embodiment has a fluid supply port 52 to which a fluid is supplied, a diffuser discharge port 54 to discharge the fluid from the interior, and a vacuum port 56 to generate negative pressure. The ejector 50 also has a main body 58 detachably connected to the fluid supply port 52 and the diffuser discharge port 54, and clamps 62, 62 as connecting members that connect the detachable ports 52, 54 to the main body 58. The main body 58 includes a first-stage main body portion 59 formed integrally with the vacuum port 56 and a second-stage main body portion 60 that forms the next stage. Like the ejector 10 of the first embodiment, the ejector 50 of the second embodiment also has main structural components made of stainless steel. In particular, the ejector 50 has a structure that suppresses dust generation by eliminating rotating moving parts in all fluid flow paths. Furthermore, the ejector 50 of the second embodiment has a three-stage nozzle 63 and diffuser nozzles 64 and 65 built in, which allows for both a large suction flow rate (e.g., 1000 L / min) and a high vacuum (-90 KPa). The fluid supply port 52 and the diffuser discharge port 54 are connected in the axial direction via the main body 58 and further via an O-ring, a clamp, etc., which will be described later.

[0024] The main body 58, which consists of a first-stage main body 59 integral with the vacuum port 56 and a second-stage main body 60 constituting the next stage, is a hollow, cylindrical stainless steel member. The first-stage main body 59 is provided with a similarly cylindrical vacuum port 56 extending perpendicularly from the axial direction of the main body 58. The main body 58 is also provided with a second-stage diffuser nozzle 64 and a third-stage diffuser nozzle 65. The second-stage diffuser nozzle 64 is located at the center of a flow path 64d, which is a stainless steel disk with several through-holes. The annular outer end of this flow path 64d is fitted inside the annular portion of a silicone check valve 66, connecting the flow path 64d with the diffuser nozzle 64 to the check valve 66. The position of the valve element of the check valve 66 corresponds to the position of the through-holes in the flow path 64d. Similarly, the third-stage diffuser nozzle 65 is provided at the center of flow path 65d, which is a stainless steel disk with several through-holes, and the annular outer end of this flow path 65d is fitted inside the annular part of a silicone check valve 67, so that flow path 65d with diffuser nozzle 65 is connected to check valve 67. The position of the valve disc of check valve 67 corresponds to the position of the through-hole in flow path 65d. Check valves 66 and 67 are each made of a silicone material that complies with the Food Sanitation Act, and are highly heat-resistant and can be sterilized by boiling or with hypochlorous acid. Therefore, an ejector that is particularly suitable for conveying food can be configured.

[0025] The diffuser discharge port 54 is a cylindrical stainless steel member. In this embodiment, it has a flange 54f at its base end, which is clamped and fixed by a clamp 62. It also has a discharge port 54p with a flange at its tip end. As described below, the diffuser discharge port 54 is detachably attached to the second-stage main body 60 of the main body 58 via the clamp 62. The fluid supply port 52 is also a stainless steel member. A nozzle 63, the axial direction of which is the fluid ejection direction, is provided in the center of the disk-shaped portion. When attached to the main body 58, the tip of this nozzle 63 faces a diffuser nozzle 64 provided in a flow path 64d within the main body 58. The supplied fluid generates negative pressure in the vacuum port 56, ejecting the fluid toward the axial tip end, thereby discharging a large amount of fluid from the diffuser discharge port 54.

[0026] The fluid flow within the ejector 50 begins with the fluid supply port 52. The fluid is then pumped through the first-stage nozzle 63, generating a high-pressure fluid at its outlet, creating a Venturi effect between the first-stage nozzle 63 and the diffuser nozzle 64. This creates a negative pressure in the hollow space of the first-stage body 59, which connects to the vacuum port 56. The fluid flow, generated by the negative pressure, can be used to attract objects at the opening 56r of the vacuum port 56. When the negative pressure reaches its limit in each stage, a pressure difference occurs between the stages, causing the check valves 66 and 67 to close the flow paths 64d and 65d, preventing backflow. The check valves operate to achieve high negative pressure in the first or second stage, which is closest to the nozzle 63. Furthermore, before or while the check valves operate, the negative pressure generated in the second or third stage allows additional fluid to be drawn in, increasing the suction volume.

[0027] Next, regarding the work of combining the ejector 50 of the second embodiment from a state in which each component is separated, the ejector 50 can be easily assembled by an operator's operation without using any tools, by combining the detachable fluid supply port 52 and the diffuser discharge port 54. When the ejector 50 of the second embodiment is disassembled, the fluid supply port 52 and the diffuser discharge port 54 are combined with a main body 58 interposed between them. The main body 58 includes a first-stage main body 59 integrally formed with a vacuum port 56 and a second-stage main body 60 constituting the next stage. At this time, three clamps 62, 62a, and 62b are used at the three combined portions. Specifically, the clamp 62 is used between the fluid supply port 52 and the first-stage main body 59, the clamp 62a is used between the first-stage main body 59 and the second-stage main body 60, and the clamp 62 is used between the second-stage main body 60 and the diffuser discharge port 54. Silicone resin-based parts are also used to clamp these three connecting portions. That is, an O-ring 68 made of a silicone material that complies with the Food Sanitation Act is interposed between the fluid supply port 52 and the first-stage main body 59, a silicone check valve 66 that fits into the annular outer end of flow path 64d is interposed between the first-stage main body 59 and the second-stage main body 60, and a silicone check valve 67 that fits into the annular outer end of flow path 65d is interposed between the second-stage main body 60 and the diffuser discharge port 54. Since these silicone-based O-rings 68 and check valves 66, 67 are each capable of elastic deformation, they are arranged in the overlapping portion of the flange between the fluid supply port 52 and the first-stage main body 59, the overlapping portion of the flange between the first-stage main body 59 and the second-stage main body 60, and the overlapping portion of the flange between the second-stage main body 60 and the diffuser discharge port 54, and when the clamps 62, 62a, 62 clamp the flanges, the O-rings 68 and check valves 66, 67 elastically deform to form tight contact, thereby maintaining an airtight seal between these components.

[0028] The clamps 62, 62a, and 62 have a common structure, and the parts can be joined by opening and closing the semi-ring-shaped clamping portions 83 and 84 around the pin 71 as a rotation center and aligning them with the overlapping flanges mentioned above. At the end of the clamping portion 83 opposite the pin 71 side, the pin 72 that serves as the rotation center for the male screw 75 is rotatably held in a holding portion 74, and at the end of the clamping portion 84 opposite the pin 71 side, an abutment piece 73 is provided upright, with a recessed portion that receives the rotated male screw 75. The male screw 75 is provided with a roughly U-shaped knob 76 that can be turned by hand by the operator, and the knob 76 and female screw 77 are interlocked. The female screw 77 and the male screw 75 are in a threaded relationship, and by rotating the knob 76, the position of the female screw 77 relative to the male screw 75 changes, and by tightening the female screw 77 against the abutment piece 73, the clamps 62, 62a, 62 can be closed. The pin 72, holding part 74, abutment piece 73, male screw 75, knob 76, and female screw 77 together function as a butterfly screw that can be turned by hand by an operator to join them, and these are collectively referred to as the butterfly screw mechanism.

[0029] When connecting the clamps 62, 62a, 62, the half-ring-shaped clamping portions 83, 84 each have a concave groove on the inner periphery, and the overlapping flanges are aligned with the groove. After fitting almost the entire circumference, excluding the butterfly screw mechanism, the male screw 75 is brought into contact with the abutment piece 73, which is received in the recess. Next, the knob 76 is rotated in the tightening direction to tighten the female screw 77 against the abutment piece 73, thereby completing the connection of the clamps 62, 62a, 62, as shown in FIG. 9. During this connection, the O-ring 68 and the check valves 66, 67 are also elastically deformed to form tight seals, thereby maintaining an airtight seal between the fluid supply port 52, the first-stage main body 59, the second-stage main body 60, and the diffuser discharge port 54.

[0030] To release the clamps 62, 62a, and 62 from their coupled state, the knob 76 is rotated in the loosening direction, which is the opposite of the coupling operation, to release the female screw 77 from the abutment piece 73, and the male screw 75 is rotated around the pin 72, thereby releasing the clamps 62, 62a, and 62, as shown in Fig. 10. After the release using these butterfly screw mechanisms, the clamps 62, 62a, and 62 are sequentially removed from the overlapping portions of the flanges, thereby enabling the ejector 50 of this embodiment to be disassembled into each of the components: the fluid supply port 52, the first-stage main body 59, the second-stage main body 60, and the diffuser discharge port 54.

[0031] When releasing the clamps 62, 62a, 62 from the coupled state, or conversely, when coupling from the released state, an operator can manually operate the knob 76 to couple or disassemble the ejector 50 of this embodiment without using any special tools. When the ejector 50 of this embodiment is used to transport items that require sterilization, such as food, the operator can easily disassemble and reassemble it, which allows the operator to clean it frequently.

[0032] Although the ejector 50 of the second embodiment has been described as having a mechanism with three stages of nozzles and / or diffuser nozzles, it may be configured with one or two stages of nozzles, or may be configured with four or more stages of nozzles and / or diffuser nozzles, and may be configured with multiple sets of nozzles and / or diffuser nozzles that can handle multiple fluids simultaneously, provided that the stages that handle a common fluid are stacked together to form a set. Also, while the clamps 62, 62a, and 62 have been described as having a common structure, they may each have a different structure or another locking mechanism; for example, the multi-stage portion may be a bracket and a snap lock or another locking mechanism. [Explanation of symbols]

[0033] 10 Ejector 12 Main Unit 13u top 13b Bottom 14 Exhaust port 16 Vacuum Port 18 Vacuum side bracket 20 Discharge side bracket 22 holes 24 mating holes 26 O-ring 28 Mating holes 30 O-rings 31 Keyway 32 U-shaped notch end 33 Keyway 34 Underside of bracket 35 U-shaped notch end 36 Top of bracket 40 Snap Lock 41 Engagement piece 42 Pivot piece 43 pin 44 Hook 45 Engagement groove 46 Hook tip 50 Ejector 52 fluid supply port 54 Diffuser exhaust port 54f Tsubabe 56 Vacuum port 56r opening 58 Main Unit 59 First stage main body 60 Second stage main body 62, 62a Clamp 63 nozzle 64, 65 Diffuser nozzle 64d, 65d flow path 66, 67 Check valve 68 O-ring Pins 71 and 72 73 Contact piece 74 Holding part 75 Male screw 76 Knob 77 Female screw 83, 84 Clamping part

Claims

1. a discharge port for discharging fluid from the interior; a vacuum port for generating negative pressure; a main body to which a fluid is supplied and which is connected to the exhaust port and the vacuum port, and which is detachably connected to at least one of the ports; a connecting member for connecting the detachable port to the main body; The coupling member can place the detachable port in a coupled state and a released state by an operator's operation without using any tools, and in the released state, the coupling member is detached from the port and the main body.

2. 2. The ejector according to claim 1, wherein the coupling member comprises a pair of brackets that engage with the port or the body, and a snap lock that is attached so as to bridge the pair of brackets.

3. 3. An ejector according to claim 2, wherein key grooves are provided on the outer periphery of the port that engages with the pair of brackets, and portions of the pair of brackets are fitted into the key grooves to engage with the port.

4. 2. The ejector according to claim 1, wherein the body is formed with a fluid supply port through which a fluid is supplied.

5. a fluid supply port through which a fluid is supplied; a discharge port for discharging fluid from the interior; a vacuum port for generating negative pressure; a main body connected to the fluid supply port, the discharge port, and the vacuum port, and detachably connected to at least one of the ports; a connecting member for connecting the detachable port to the main body; The coupling member can place the detachable port in a coupled state and a released state by an operator's operation without using any tools, and in the released state, the coupling member is detached from the port and the main body.

6. 6. An ejector according to claim 5, wherein the coupling member comprises an openable and closable clamp member, and a butterfly screw mechanism is provided at the openable and closable end of the clamp member.

7. 6. The ejector of claim 5, wherein said vacuum port is integrally connected to said body.

8. 6. The ejector according to claim 5, wherein the main body has a plurality of stages of diffusers built therein, the main body is separable into each stage of the diffusers, and the main body separated into each stage is also connected by a connecting member.

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