Vacuum ejector pump

Abstract

To provide a vacuum ejector pump that may be easily assembled and manufactured, may remain robust and stable during installation and use, and may minimize vacuum leakage.SOLUTION: A vacuum ejector pump 10 that operates through high-speed compressed air includes: an external 'C'-shaped clip 13 for securely fixing a casing 12 assembled over a nozzle body; an internal fastening groove 30a and protrusion 13a to prevent arbitrary rotation of the casing relative to the body; and a guide groove 31a and protrusion to indicate the assembly orientation of the body and the casing. Further included is a check valve 23 that is organically coupled to the body.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a vacuum ejector pump, and more particularly to a vacuum ejector pump that operates by compressed air flowing in and out at high speeds and is used to evacuate a certain space. [Background technology]

[0002] Generally, a vacuum ejector pump is a device used in a vacuum transfer system, and includes an ejector body including a series-arranged multi-stage nozzle, a sidewall through-hole formed in a sidewall of the body, and a flexible valve installed inside the sidewall through-hole. In particular, a small vacuum ejector pump is directly installed inside a housing where it is required, and a vacuum chamber inside the housing is in communication with the sidewall through-hole. A separate suction device, such as a suction cup or pad, is then connected to the vacuum chamber to form a vacuum system.

[0003] When the system is in operation, the compressed air is discharged through the ejector body at high speed. The air inside the vacuum chamber is drawn into the body through the sidewall holes and discharged along with the compressed air. This creates a vacuum and negative pressure (-kPa) in the vacuum chamber and suction device. When the negative pressure drops below a certain level, the sidewall holes are closed by the valve, and the vacuum chamber maintains that pressure level. The negative pressure inside the suction device created during this process is used to grip and transport items.

[0004] Representative examples of such vacuum ejector pumps include those disclosed in Patent Document 1 (U.S. Patent No. 6,394,760) and Patent Document 2 (U.S. Patent No. 823,1358). The former is configured by assembling a plurality of nozzles of the same shape aligned in one direction, with valve elements installed between each nozzle, while the latter is configured by assembling each nozzle using a separate cylindrical member.

[0005] The above-disclosed devices are currently in use in vacuum transfer work sites. However, each of these devices has problems such as a complex assembly of each component, which reduces productivity, a weak and unstable structure, as each component can easily separate or rotate during installation and use, and a tendency for vacuum leakage to occur due to a weakened airtightness. Furthermore, the latter device has a large number of components, which makes production and assembly cumbersome and uneconomical. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Korean Patent Registration No. 10-0393434 [Patent Document 2] Korean Patent Registration No. 10-0629994 [Patent Document 3] Korean Patent Publication No. 10-1039470 [Patent Document 4] Korean Patent Publication No. 10-1685998 Summary of the Invention [Problem to be solved by the invention]

[0007] The present invention is an improved invention proposed to solve the problems of the conventional vacuum ejector pumps, particularly the vacuum ejector pump disclosed in Patent Document 2. An object of the present invention is to provide a vacuum ejector pump that can be easily assembled and manufactured, can be maintained in a solid and stable state during installation and use, and can minimize vacuum leakage. [Means for solving the problem]

[0008] The vacuum ejector pump of the present invention comprises: It is based on a vacuum pump that works by using compressed air flowing in and out at high speed to create negative pressure in the outer enclosure. a frame in which an air inlet pipe, a disk, and an air outlet pipe are sequentially spaced apart and connected together by a spacer; and a body including a nozzle attached to pass through the center of the disk; a cylindrical housing having sidewall through-holes formed at positions corresponding to flexible check valves attached to the spacer sections, the cylindrical housing tightly receiving the body to form a vacuum chamber in each spacer section; a "C"-shaped clip that is inserted into the outer diameter of the air inlet pipe side of the main body and presses the other end of the housing, one end of which is supported by the step of the air outlet pipe, from the air inlet pipe side to tightly fix the housing; Including, Here, the check valve is a ring-shaped fixing part that is inserted into and fixed to an annular groove formed on the outer diameter of the disk, and a flap valve part that extends from the fixing part and opens and closes the side wall through-hole by air pressure, which are integrally formed; At this time, the flap valve portion It is composed of a pair of left and right parts, and grooves or holes are formed at the boundary between the fixed part and the part to allow free movement. It is characterized by:

[0009] Preferably, the vacuum ejector pump comprises: a fastening groove is formed on the outer peripheral surface of the disk, and a fastening protrusion corresponding to the fastening groove is formed on the inner surface of the housing; When assembling the main body and the housing, the fastening protrusion is inserted into the fastening groove to couple them together, thereby preventing the housing from rotating. It is characterized by: At this time, for ease of assembly of the housing, Between the end of the housing and the step of the air exhaust pipe, a guide groove and a protrusion for assembly are formed so that they can be visually confirmed from the outside that the correct direction in which the fastening protrusion and the fastening groove are mated together is set. It is characterized by: [Effects of the Invention]

[0010] The vacuum ejector pump of the present invention is based on a vacuum pump including an assembled nozzle body and housing, and by optimally configuring the structures of the "C" clip, fastening groove and protrusion, guide groove and protrusion, and check valve, the housing and the entire device can be maintained in a solid and stable state during installation and use, resulting in the effect of minimizing vacuum leakage. [Brief explanation of the drawings]

[0011] [Figure 1] FIG. 1 is an outline view of a vacuum ejector pump according to the present invention. [Figure 2] FIG. 2 is an exploded view of FIG. 1. [Figure 3] FIG. 3 is an enlarged view of the "clip" applied to FIG. 2. [Figure 4] FIG. 3 is an enlarged view of the "valve" applied to FIG. 2. [Figure 5] FIG. 2 is a cross-sectional view taken along line AA' in FIG. [Figure 6] FIG. 2 is a cross-sectional view taken along the line BB′ in FIG. [Figure 7] 1 is a diagram illustrating a state in which a vacuum ejector pump according to the present invention is used; DETAILED DESCRIPTION OF THE INVENTION

[0012] The features and effects of the "vacuum ejector pump" (hereinafter referred to as "ejector pump") of the present invention, whether described or not, will become more apparent through the following description of the embodiments with reference to the accompanying drawings. In the drawings, the reference numeral "10" denotes an ejector pump according to the present invention.

[0013] 1 to 6, the ejector pump 10 of the present invention is based on a so-called vacuum pump that operates by using compressed air flowing in and out at high speed to generate negative pressure in an external enclosed space. The ejector pump 10 includes a nozzle body 11, a cylindrical housing 12 that houses the body 11, and a clip 13 for fixing the housing 12 to the body 11.

[0014] The main body 11 includes a frame 14 and nozzles 15, 16, and 17. The frame 14 is integrally formed by sequentially spaced apart air inlet pipe 18, circular disks 19 and 20, and air outlet pipe 21, which are connected by a spacer 22. The nozzles 15, 16, and 17 are attached by passing through the centers of the disks 19 and 20. In this embodiment, there are two disks 19 and 20, but in other embodiments (not shown), there may be one or three or more disks.

[0015] The nozzles 15, 16, and 17 are inserted into the center of each disk 19 and 20 and arranged in series at intervals to form one nozzle set. In another embodiment (not shown), a plurality of nozzle sets may be provided in parallel by forming a number of mounting holes in each disk 19 and 20.

[0016] The spacers 22 are formed on the edges of the disks 19 and 20 in pairs facing each other. More specifically, each spacer 22 has a rounded outer surface and a flat inner surface. In particular, the rounded outer surface of the spacer 22 allows it to fit tightly against the inner surface of the cylindrical housing 12. A flexible check valve 23 is disposed in the portion opened by the spacer 22.

[0017] More specifically, the check valve 23 is integrally formed with a ring-shaped fixed portion 23a that is inserted into an annular groove (not numbered) formed on the outer periphery of the disks 19 and 20 and is fixed while surrounding the annular groove, and a flap valve portion 23b that extends from the fixed portion 23a and moves freely by air pressure to open and close a side wall through-hole 24 of the housing 12, which will be described later. In this embodiment, the flap valve portion 23b is formed in a pair on the left and right, and a groove or hole 23c that allows the flap valve portion 23b to move freely is formed at the boundary between the fixed portion 23a and each flap valve portion 23b.

[0018] The check valve 23 may be made of a flexible material, such as a material selected from natural rubber, synthetic rubber, or urethane rubber.

[0019] The housing 12 has sidewall through-holes 24 formed at positions corresponding to the flap valve portions 23b of the check valve 12. The housing 12 accommodates the nozzle body 11 in close contact with its inner wall. Specifically, all elements of the body 11 except for the nozzles 15, 16, and 17, and the check valve 23, are tightly fitted to the inner surface of the housing 12. Thus, vacuum chambers 25, 26, and 27 are formed in the spacers 22 of the body 11. The vacuum chambers 25, 26, and 27 are connected to each other via the nozzles 15, 16, and 17 attached to the disks 19 and 20, and can also communicate with the outside or the surrounding space through the sidewall through-holes 24. The opening and closing of the sidewall through-holes 24 is controlled by the flexible flap valve portions 23b of the check valve 23, which are operated by air pressure.

[0020] For example, in a one-to-one correspondence between the flap valve portion 23b and the side wall through-hole 24, there is a possibility that the flap valve portion 23b may be inserted into the side wall through-hole 24 and unable to return to its original position depending on the size of the side wall through-hole 24. Therefore, in this embodiment, a many-to-one correspondence is established between the side wall through-hole 24 and each flap valve portion 23b, that is, one flap valve portion 23b simultaneously corresponds to at least two adjacent side wall through-holes 24, thereby actually reducing the size of each side wall through-hole 24 and thereby solving this problem.

[0021] In the drawings, reference numeral 28 denotes an "O" shaped gasket provided at the corner of each disk 19, 20 and in contact with the inner surface of the housing 12 to block unwanted air movement between each vacuum chamber 25, 26, 27.

[0022] The ejector pump 10 is assembled by attaching a check valve 23 to the main body 11 and then inserting the main body 11 into the housing 12. In order to facilitate easy insertion of the main body 11 into the housing 12, the housing 12 preferably has an inner diameter that expands in a stepped manner. In this case, one end of the housing 12 is configured to receive the end of the air discharge pipe 21 and be supported by a step 29 of the air discharge pipe 21.

[0023] However, this does not ensure that the housing 12 is held firmly in place. In fact, when the ejector pump 10 is forcibly fixed to a structure, the housing 12 is subjected to considerable torsion and torque, which can easily cause deformation, resulting in the device being unable to fully utilize its vacuum characteristics. Therefore, a means is needed to firmly fix and maintain the housing 12.

[0024] First, in the present invention, the clip 13 is provided to firmly secure the housing 12 to the main body 11. The clip 13 is roughly "C" shaped and is inserted into the outer diameter of the main body 11 on the air inlet pipe 18 side, so that one end of the housing 12, which is supported by the step 29 of the air outlet pipe 21, is pressed and tightly attached by the clip 13 on the air inlet pipe 18 side, thereby firmly securing the housing 12. A plurality of protrusions 13a are formed on both ends and the outer diameter of the clip 13, which allows for easy assembly and disassembly.

[0025] Next, a fastening groove 30a is formed on the outer periphery of each of the discs 19 and 20, and a fastening protrusion 30b corresponding to the fastening groove 30a is formed on the inner surface of the housing 12. Therefore, when assembling, the fastening protrusion 30b is inserted into the fastening groove 30a, so that the housing 12 is firmly connected to the main body 11 without being rotated arbitrarily.

[0026] However, because the fastening protrusion 31 is not an element that can be seen externally, it is not easy to align the directions of the fastening groove 30a and the fastening protrusion 30b when assembling the housing 12 and the main body 11. Therefore, in this embodiment, assembly guide grooves 31a and protrusions 31b are formed between the end of the housing 12 and the engaging step 29 of the air discharge pipe 21 during assembly, so that they can be easily seen with the naked eye from the outside during assembly to ensure that the correct direction in which the fastening protrusion and the fastening groove are mated and fastened can be set. More specifically, when the housing 12 is inserted into the main body 11 during assembly, if the guide groove 31a is matched with the guide protrusion 31b, it is considered that the fastening groove 30a and the fastening protrusion 31b are fastened to each other in the correct position.

[0027] 7, there is shown an ejector pump 10 of the present invention housed inside a housing H of a separate device. The ejector pump 10 passes through an enclosed space S and is installed on both side walls of the housing H. In this case, the enclosed space S can communicate with inner vacuum chambers 25, 26, and 27 of the ejector pump 10 through side wall through-holes 24.

[0028] In this state, compressed air supplied into the ejector pump 10 through the air inlet pipe 18 passes through the nozzles 15, 16, and 17 at high speed and is discharged to the outside through the air discharge pipe 21. At this time, air in the enclosed space S is drawn into the vacuum chambers 25, 26, and 27 through the side wall through-holes 24 of the ejector pump 10 and the opened check valve 23, and is discharged together with the compressed air (see arrows). This exhaust and discharge action generates a vacuum and negative pressure in the enclosed space S.

[0029] Then, when the vacuum and negative pressure (-kPa) in the enclosed space S drops below the internal pressure of the ejector pump 10, the check valve 23 returns to its original position and all the side wall through holes 24 are closed, thereby maintaining the pressure level in the enclosed space S. The vacuum and negative pressure thus generated and maintained are effectively used in a vacuum transfer system that actually grips the target object and transfers it to a predetermined position. [Explanation of symbols]

[0030] 10: Ejector pump 11: Main body 12: Cabinet 13: Clip 13a: Protrusion 14: Frame 15, 16, 17: Nozzle 18: Air inlet pipe 19, 20: Disc 21: Air exhaust pipe 22: Spacer 23: Check valve 23a: Fixed part 23b: Flap valve section 23c: hole 24: Side wall hole 25, 26, 27: Vacuum chamber 28: Gasket 29: Step 30a: Fastening groove 30b: Fastening protrusion 31a: Guide groove 31b: Guide protrusion H: Housing S: Enclosed space

Claims

1. A vacuum ejector pump that operates by using compressed air flowing in and out at high speed to generate negative pressure in an outer enclosed space, a frame (14) in which an air inlet pipe (18), discs (19), (20) and an air outlet pipe (21) are sequentially spaced apart and connected together by a spacer (22); and a main body (11) including nozzles (15), (16), (17) attached to the discs (19), (20) so as to pass through their centers; a cylindrical housing (12) having sidewall through-holes (24) formed at positions corresponding to flexible check valves (23) attached to the spacer (22) portions, and tightly receiving the main body (11) so that vacuum chambers (25), (26), and (27) are formed in each spacer (22) section; a "C"-shaped clip (13) that is inserted into the outer diameter of the air inlet pipe (18) side of the main body (11) and that tightly fixes the housing (12) by applying pressure from the air inlet pipe (18) side to the other end of the housing (12), one end of which is supported by the step (29) of the air outlet pipe (21); Including, Here, the check valve (23) is A ring-shaped fixing portion (23a) is inserted into an annular groove formed on the outer diameter of the disks (19) and (20) and fixed thereto, and a flap valve portion (23b) is extended from the fixing portion (23a) and opens and closes the side wall through-hole (24) by air pressure, and the fixing portion (23a) is integrally formed with the disks (19) and (20). The flap valve portion (23b) is The left and right portions are configured as a pair, and a groove or hole (23c) is formed at the boundary between the left and right portions and the fixed portion (23a) to allow the free movement of the left and right portions. A vacuum ejector pump characterized by:

2. A plurality of protrusions (13a) are formed on both ends and the outer circumference of the clip (13) to facilitate disassembly and assembly.

2. The vacuum ejector pump according to claim 1,

3. A fastening groove (30a) is formed on the outer peripheral surface of the disks (19) and (20), and a fastening protrusion (30b) corresponding to the fastening groove (30a) is formed on the inner surface of the housing (12), When assembling the main body (11) and the housing (12), the fastening protrusion (30b) is inserted into the fastening groove (30a) to couple together, thereby preventing the housing (12) from rotating.

2. The vacuum ejector pump according to claim 1,

4. Between the end of the housing (12) and the engaging step (29) of the air discharge pipe (21), an assembly guide groove (31a) and a protrusion (31b) are formed, which engage with each other to allow the naked eye to confirm from the outside that the correct direction in which the fastening protrusion and the fastening groove (30a) are correspondingly fastened is set.

4. The vacuum ejector pump according to claim 3,

5. The spacers (22) are formed on the edges of the disks (19) and (20) in pairs facing each other; 2. The vacuum ejector pump according to claim 1,

6. The housing (12) and the check valve (23) form a "many-to-one" correspondence between the side wall through-holes (24) and each of the flap valve portions (23b), i.e., one flap valve portion (23b) simultaneously corresponds to at least two adjacent side wall through-holes (24); 2. The vacuum ejector pump according to claim 1,

Images