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Vacuum ejector pumpsRelated Patent Categories: Pumps, One Fluid Pumped By Contact Or Entrainment With Another, Jet, Successive Entrainment Of Pumped FluidVacuum ejector pumps description/claimsThe Patent Description & Claims data below is from USPTO Patent Application 20070148009, Vacuum ejector pumps. Brief Patent Description - Full Patent Description - Patent Application Claims
TECHNICAL FIELD [0001] The present invention relates generally to vacuum ejector pumps, operated by compressed air which flows in and out at high velocity, thus creating negative pressure in a space, and more particularly to a vacuum ejector pump, which includes a cylindrical nozzle body having one or more mounting nozzles therein, and a cover mounted to the nozzle body to cover an opening formed at a predetermined position of the nozzle body. BACKGROUND ART [0002] A conventional vacuum pump, which is called a multi-stage ejector, is shown in FIG. 1. The vacuum pump 100 includes chambers 101, 102, and 103 which are arranged in series, and a plurality of nozzles 105, 106, and 107 which are installed through partition walls between the chambers 101, 102, and 103. The chambers 101, 102, and 103 communicate with a common vacuum chamber 104 through holes 108, 109, and 110. The vacuum pump 100 is connected to external equipment (e.g. suction equipment) through a port 111 which is formed at a predetermined position in the vacuum chamber 104. [0003] When high-speed compressed air is discharged through the nozzles 105, 106, and 107, the compressed air is discharged along with internal air of the vacuum chamber 104 and the external equipment, so that the internal pressure of the vacuum chamber 104 is lowered. When the pressure in the vacuum chamber 104 becomes lower than the pressure in each chamber 101, 102, 103, all of the holes 108, 109, and 110 are closed by valves 112, 113, and 114. The vacuum chamber 104 maintains the pressure level. During such a process, negative pressure is created in the external equipment. The negative pressure is used to carry articles. [0004] However, the conventional vacuum pump 100 is problematic in that it is impossible to directly install it in various equipment requiring that air be expelled, and it is difficult to disassemble or assemble the pump for repair or maintenance. [0005] In order to solve the problems of the conventional vacuum pump 100, another type of vacuum pump has been proposed. The vacuum pump is disclosed in Korean Patent No. 393434 (U.S. Pat. No. 6,394,760), and is shown in FIG. 2. According to this patent, the vacuum pump 200 includes a plurality of nozzles 202, 203, 204, and 205 and valve members 210. The nozzles 202, 203, 204, and 205 are assembled in series, with slots 207, 208, and 209 provided between the nozzles. The valve members 210 are located between the nozzles 202, 203, 204, and 205, and serve to open and close communication holes 206 which are formed in walls of the nozzles 202, 203, 204, and 205. Coupling means are provided on the nozzles 202, 203, 204, and 205 to couple the nozzles 202, 203, 204, and 205 to an integrated, rotationally symmetrical nozzle body 201. [0006] The vacuum pump 200 is directly accommodated in a housing H of another piece of equipment, and is operated by high-speed compressed air which sequentially passes through the nozzles 202, 203, 204, and 205, thus creating negative pressure in an internal space S of the housing H. [0007] However, the conventional vacuum pump 200 is problematic in that joints between the nozzles 202, 203, 204, and 205 are prone to break or be deformed (bent or distorted) by external pressure or impact when the vacuum pump 200 is in use. Further, when the vacuum pump 200 breaks down, all components of the pump must be disassembled to check the vacuum pump 200. DISCLOSURE OF INVENTION Technical Problem [0008] Accordingly, the present invention is intended to solve the problems of the vacuum pump 200 disclosed in the above-mentioned patent. [0009] An object of the present invention is to provide a vacuum ejector pump, which is directly installed in various equipment requiring that air be expelled, and does not break or become deformed when the pump is in use. Another object of the present invention is to provide a vacuum ejector pump, which is capable of being rapidly and precisely checked and treated when trouble occurs in the pump. Technical Solution [0010] In order to accomplish the objects, the present invention provides a vacuum ejector pump which has characteristics disclosed in the first claim. The preferred embodiment of this invention covers elements disclosed in the dependent claims. Advantageous Effects [0011] The vacuum ejector pump of the present invention is equal to the above-mentioned conventional vacuum pump 200 in that the pump may be directly installed in various equipment requiring that air be expelled. [0012] However, the vacuum ejector pump of this invention is more advantageous than the conventional vacuum pump in that components are safely protected by a nozzle body, and components including mounting nozzles or valve members can be observed through an opening or a cover with the naked eyes, thus enabling rapid and precise check and treatment of malfunctions of the pump. BRIEF DESCRIPTION OF THE DRAWINGS [0013] FIG. 1 is a sectional view of a conventional vacuum ejector pump; [0014] FIG. 2 is a sectional view of another conventional vacuum ejector pump; [0015] FIG. 3 is a perspective view of a vacuum ejector pump, according to an embodiment of the present invention; [0016] FIG. 4 is an exploded perspective view of the vacuum ejector pump of FIG. 3; [0017] FIG. 5 is a vertical sectional view of the vacuum ejector pump of FIG. 3; Continue reading about Vacuum ejector pumps... Full patent description for Vacuum ejector pumps Brief Patent Description - Full Patent Description - Patent Application Claims Click on the above for other options relating to this Vacuum ejector pumps patent application. ###  How KEYWORD MONITOR works... a FREE service from FreshPatents1. Sign up (takes 30 seconds). 2. Fill in the keywords to be monitored. 3. Each week you receive an email with patent applications related to your keywords. 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