KR20040011571A - Vacuum ejector device - Google Patents

Abstract

PURPOSE: A vacuum ejector is provided to improve assemblability and rigidity, to reduce material cost and to allow easy setting of connection by forming components of the ejector integrally with a body of a valve unit. CONSTITUTION: An ejector comprises a valve unit(10) including a body(11) having an input port(12), a suction port(13) and an output port(14) bored on a side thereof, and a negative pressure breaking control valve(19) and a vacuum generating control valve(20) mounted on an upper side of the body to be separated therefrom, and supplying compressed air introduced through the input valve to the suction port or an ejector part(30), respectively; the ejector part formed integrally with a surface of the body, and integrally including a pressure chamber(31) connected with the input port through the vacuum generating control valve, vacuum chambers(32,33) connected with the suction port, a discharge chamber(34) connected with the output port, and nozzle holes(36,37) connecting the chambers in order; and a plate type cover covering the ejector part, and preventing unnecessary movement of air between the chambers.

Description

Vacuum ejector device {Vacuum ejector device}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vacuum ejector apparatus, and more particularly, to a vacuum ejector apparatus for adsorption conveyance of an article to which an adsorption pad is connected and acts by compressed air.

Basically, the ejector device is composed of a pressure chamber having an input port, a vacuum chamber having a suction port, a discharge chamber having an output port, and a multi-stage nozzle communicating each chamber with each other. As the internal air of the suction pad connected to the suction port is discharged together by the hydraulic pressure of the discharged compressed air, negative pressure is generated in the suction pad, and the generated negative pressure enables adsorption and conveyance of the article. The principle concept of this ejector device is also referred to in U.S. Pat. The same applies to.

On the other hand, the conventional ejector device including the device disclosed in the above-mentioned US patents does not have a means for releasing the negative pressure generated in the adsorption pad, so it is not easy to separate the article and the adsorption pad after transporting the article to a predetermined position. There was a problem. Proposed to solve this problem is US Patent No. 4,865,521 (September 1989), Japanese Patent Laid-Open No. 6-300000 (1994.10.25) and the like. The ejector device disclosed in these patents consists of a block-type valve unit and an ejector unit which are installed in contact with a side thereof, and the valve unit includes a symmetrically built-in vacuum generating valve and a vacuum discarding valve and air extending from each valve. It includes a passage. In this apparatus, the negative pressure formed in the adsorption pad by the action of the ejector unit is destroyed by the compressed air supplied to the adsorption port via the vacuum evacuation valve and the air passage. Therefore, the forced separation of the article and the adsorption pad is made after the goods return.

However, the devices disclosed in these patents have a burden of considering precision and robustness when assembling as the ejector unit is installed on the side of the valve unit. In addition, the overall volume of the device is increased, as well as the design of the internal air passage of the valve unit becomes long and complicated. Proposed for solving this problem is Korean Patent Publication No. 2003-31592 by the inventor. The ejector device disclosed in this patent is formed by forming a recess of a predetermined depth on the front surface of the metallic valve unit body, and inserting a known block type ejector unit into the recess. This device obviously has no problems with assembly and robustness. In addition, by inserting the ejector unit by securing the effective space in the valve unit body, it can be miniaturized, and the design of the air passage is made simple.

However, it is economically double lost to completely cut the surface of the valve unit body to form a recess, and to insert an ejector unit separately provided at the recess, which is a factor of increase in manufacturing cost. On the other hand, it has been very difficult to design various communication relationships between the body of the valve unit and the ejector unit (particularly, the communication relationship between the suction port on the valve unit body and the vacuum chamber of the ejector unit).

The present invention is an improvement of the Korean Patent Laid-Open Publication No. 2003-31592 by the present inventors, by forming each ejector element so as to be integral with the body of the valve unit, so that the assemblability and robustness are better, further reducing material cost and various communication. It is an object of the present invention to provide an ejector device that can be easily set.

1 is a perspective view of a device according to the invention.

2 is a partially exploded perspective view of FIG. 1.

3 is a cross-sectional view of FIG.

4 is a cross-sectional view for explaining the negative pressure generating action of the apparatus according to the present invention.

5 is a cross-sectional view for explaining the negative pressure breaking action of the apparatus according to the present invention.

<Description of the symbols for the main parts of the drawings>

10. Valve unit 11. Body

12.Input port 13. Suction port

14.Output ports 19, 20. Control valve

Guide 24. filter

25. Silencer 30. Ejector unit

31. Pressure chambers 32, 33. Vacuum chamber

34. Emission chambers 35, 36, 37. Nozzle ball

38,39,40. Nozzles 42,43. Hook

44,45. Check Valve 46. cover

The present invention is:

A body having an input port, a suction port, and an output port, each drilled from the side, and a negative pressure breakdown control valve and vacuum to be spaced from an upper surface of the body to supply compressed air introduced through the input port to the suction port or ejector part side. A known valve unit including a generation control valve;

It is formed integrally with the surface of the body, the pressure chamber in communication with the input port via the control valve, the vacuum chamber in communication with the suction port, the discharge chamber in communication with the output port, the multi-stage to communicate each chamber in turn An ejector unit integrally including a series of nozzle holes;

It is provided to cover the ejector portion, it is made of a plate-like cover provided so that unnecessary air movement between each chamber of the ejector portion is not generated.

According to the present invention, each element of the ejector unit is integrally molded to the body of the valve unit, and thus, the assembly and the robustness are better, and further, the material cost is reduced. Hereinafter, the features and operation of the present invention will be described in detail with reference to the embodiments shown in the accompanying drawings.

1, 2 and 3, the device according to the invention is formed integrally with the valve unit 10 comprising a pair of control valves 19 and 20 and the body 11 of the valve unit 10. The ejector unit 30 and a cover 45 provided to cover the ejector unit 30 are included.

The valve unit 10 includes a body 11 designed to enable input and output of compressed air, and a pair of control valves 19 and 20 to allow the flow of compressed air. The body 11 may be made of metal (particularly aluminum) or plastic material, and is approximately rectangular parallelepiped. In one side of the body 11, the input port 12, the suction port 13 and the output port 14 are formed in turn, as long as they are spaced apart from each other and vertically communicate with the input port 12, respectively. A pair of valve receiving grooves 15 and 16 are formed. In the interior of the body 11, by one of the air passage (17, 18) extending downward from each receiving groove (15, 16), any one receiving groove 15 is in communication with the suction port (13) The other receiving groove 16 communicates with the pressure chamber 31 of the ejector unit 30.

Control valves 19 and 20 provided in the same form are mounted in the receiving grooves 15 and 16, respectively, and selectively operated to supply compressed air introduced from the input port to the suction port 13 side or the ejector unit ( 30) to the side. At this time, the supply of compressed air to the suction port 13 side is the negative pressure release valve 19, the supply to the ejector unit 30 side is the vacuum generating valve 20, each control valve (19, 20) It is controlled to operate selectively by the solenoid valves 21 and 22. Reference numeral 26 in FIG. 3 is a screw provided to adjust the cross-sectional area of the air passage (17).

Inside the suction port 13, a cylindrical filter 24 having one side open is mounted, and a silencer 25 is mounted inside the output port 14. In particular, at the time of the negative pressure breaking action (see FIG. 5), the compressed air supplied by the negative pressure breaking valve 19 and passing through the air passage 17 flows into the open side of the filter 24 to open the sidewall of the filter 24. While passing through the suction port 13 side, such an air supply method has the advantage that the life of the filter 24 is extended compared to the conventional method.

During the negative pressure generation operation (see FIG. 4), foreign matters deposited on the surface of the article are filtered and accumulated on the outer surface of the filter 24. On the other hand, according to the conventional method, during the negative pressure break action, the compressed air flows toward the suction port 13 while pressing the outer surface of the filter 24, and foreign matter is fixed to the pores of the filter 24 by the pressure of the compressed air. This phenomenon occurs, and the filter 24 is replaced at any time. On the other hand, according to the present invention, when the negative pressure break action, the compressed air flows into the inside of the filter 24 and flows through the side wall to the suction port 13 side, wherein foreign matter on the outer surface of the filter 24 It is discharged to the outside together with the compressed air, so that the filter 24 can be maintained in a good state for a long time.

Preferably, a guide 23 protruding from the body 11 toward the suction port 13 is formed directly below the negative pressure discarding valve 19. The guide 23 is supplied by the negative pressure scavenging valve 19 to induce the deflection of the compressed air passing through the air passage 17 to be directed directly to the suction port 13 side.

The ejector unit 30 is integrally formed on the body 11 by cutting or plastic injection molding the surface of the body 11 of the valve unit 10, and via the vacuum control valve 20. Pressure chamber 31 in communication with input port 12, vacuum chambers 32 and 33 in communication with suction port 13, discharge chamber 34 in communication with output port 14, and respective chambers 31 And 32, 33, 34 in series nozzle nozzles 35, 36, 37 in series communication. The nozzle holes 35, 36 and 37 are shown as two sets in the figure, but may be one set or three or more sets. When provided in multiple sets, it may exist in an up-down relationship. Preferably, the ejector unit 30 includes nozzles 38, 39, 40 that are separately provided to be inserted into the nozzle holes 35, 36, 37. Since the nozzles 38, 39, and 40 are manufactured separately from the valve unit 10 body 11, there is an advantage that the nozzles can be separately processed, such as forming holes 41 along the outer circumferential surface thereof.

In addition, the ejector unit 30 includes hook valve mounting hooks 42 and 43 formed on sidewalls of the vacuum chambers 32 and 33. Check valves 44 and 45 are provided to prevent compressed air from flowing from the vacuum chambers 32 and 33 to the suction port 13 side.

The cover 45 is provided to cover the ejector unit 30, and a packing 47 is provided to prevent unnecessary air movement between the chambers of the ejector unit 30. The cover 46 and the ejector unit 30 are provided. Is placed in between.

The apparatus according to the present invention configured as described above is used to connect the tube of the vacuum suction pad (P) in contact with the surface of the article on the suction port 13 side, and acts by the compressed air supplied from the input port 12 .

Referring to FIG. 4, the compressed air is supplied to the pressure chamber 31 of the ejector unit 30 through the control valve 20 for vacuum generation opened by the solenoid valve 22 and the air passage 16 below. Supplied. The compressed air supplied to the pressure chamber 31 sucks air in the vacuum chambers 32 and 33 via the nozzles 38, 39 and 40, and is finally discharged through the output port 14. At this time, the check valves 44 and 45 are opened, and the air in the suction pad P is drawn into the vacuum chambers 32 and 33 by the hydraulic pressure of the compressed air and discharged to the outside together with the compressed air (indicated by the dashed lines).

In this way, when the degree of vacuum in the vacuum chambers 32 and 33 starts to increase and the maximum degree of vacuum is reached, the check valves 44 and 45 are closed and negative pressure is formed and maintained in the suction pad P. At this time, the article can be moved to a predetermined place by pressing the suction pad (P) by the formed negative pressure.

Referring to FIG. 5, the compressed air is supplied to the suction port 13 side through the negative pressure release control valve 19 opened by the solenoid valve 21 and the air passage 17 below it (indicated by the dotted line). ). As a result, the negative pressure formed in the suction pad P is destroyed, and separation between the suction pad and the article is performed.

At this time, the compressed air through the air passage 17 is rapidly turned to the suction port 13 side by the direction of the projection guide 23 formed to the suction port 13 side. For example, when the guide 23 is absent, the compressed air is dispersed to the vacuum chambers 32 and 33 and the amount and pressure of air supplied into the suction pad P are lowered. Therefore, according to the guide 23 it is possible to achieve a faster negative pressure destruction. If necessary, the speed of the negative pressure breaking can be reduced by reducing the cross-sectional area of the air passage 17 by using the screw 26.

According to the invention each element of the ejector portion is integrally molded to the body of the valve unit. Therefore, the assembly and robustness is more excellent, further reducing the material cost. In addition, there is an advantage that it is possible to simply design the communication relationship between each ejector element and each port on the body.

Claims (5)

A body having an input port, a suction port, and an output port, each drilled from the side, and a negative pressure breakdown control valve and vacuum to be spaced from an upper surface of the body to supply compressed air introduced through the input port to the suction port or ejector part side. A known valve unit including a generation control valve; It is integrally formed on the surface of the body, and the pressure chamber is in communication with the input port via the vacuum generating control valve, the vacuum chamber in communication with the suction port, the discharge chamber in communication with the output port, each chamber in turn An ejector unit integrally including a nozzle hole of a multi-stage series in communication; It is provided to cover the ejector portion, vacuum ejector apparatus characterized in that the plate-like cover is provided so that unnecessary air movement between the chambers of the ejector portion is not generated. 2. The vacuum according to claim 1, wherein the ejector portion is formed on the side wall of the vacuum chamber and integrally includes a hook for installing a check valve provided to prevent compressed air from flowing from the vacuum chamber to the suction port side. Ejector device. The vacuum ejector apparatus according to claim 1, wherein the ejector unit includes a nozzle that is separately provided to be inserted into the nozzle hole. The compressed air according to any one of claims 1 to 3, wherein a cylindrical filter having an open side is mounted inside the suction port, and is supplied from the input port and supplied to the suction port side by a control valve for negative pressure breakage. Is injected into the open side of the filter is a vacuum ejector device, characterized in that to be supplied while passing through the side wall of the filter. According to any one of claims 1 to 4, wherein the lower portion of the negative pressure control valve for protruding toward the suction port from the inside of the body is formed, the compressed air supplied by the negative pressure control valve for suction A vacuum ejector device characterized in that it is refracted to the port side.