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Combined compressing apparatusCombined compressing apparatus description/claimsThe Patent Description & Claims data below is from USPTO Patent Application 20070160482, Combined compressing apparatus. Brief Patent Description - Full Patent Description - Patent Application Claims
BACKGROUND OF THE INVENTION [0001]The present invention relates to a combined compressing apparatus compressing in a downstream compressor a compressed gas discharged from an upstream compressor. [0002]JP2703319B2 discloses a combined compressing apparatus in which a turbo-type compressor is used as an upstream compressor and a volume-type compressor such as a reciprocating compressor or a scroll compressor is used as a downstream compressor. A primary compressed gas in the turbo-type compressor is forwarded to the volume-type compressor in which a primary compressed gas is further compressed and discharged as a secondary high-pressure compressed gas. [0003]However, in a known combined compressing apparatus, a massive low-pressure compressed gas is discharged from the turbo-type compressor as upstream compressor, so that a large volume-type compressor is used to suck the primary massive compressed gas from the turbo-type compressor to make its size larger and make power load increased. SUMMARY OF THE INVENTION [0004]In view of the disadvantages in the prior art, it is an object of the invention to provide a combined compressing apparatus which makes its size smaller and makes power load decreased thereby producing a high-pressure compressed gas effectively. BRIEF DESCRIPTION OF THE DRAWINGS [0005]The features and advantages of the invention will become more apparent from the following description with respect to embodiments as shown in accompanying drawings wherein: [0006]FIG. 1 is a schematic view of a combined compressing apparatus according to the present invention; [0007]FIG. 2 is a vertical sectional view of the first embodiment of a combined compressing apparatus according to the present invention; and [0008]FIG. 3 is a vertical sectional view of the second embodiment of a combined compressing apparatus according to the present invention. DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS [0009]As shown in FIG. 1, in a combined compressor according to the present invention, a scroll compressor 1 that is excellent in quietness and saving energy is employed as upstream compressor and a reciprocating compressor 2 that is simple in structure and can supply high pressure is employed as downstream compressor. A primary compressed gas A compressed by the scroll compressor 1 is sent to the reciprocating compressor 2, by which the primary compressed gas A is further compressed to a high pressure secondary compressed gas B which is sent to a tank 3. [0010]In FIG. 2, the first embodiment of a combined compressing apparatus is shown in which the rear of a cylindrical housing 11 of the scroll compressor 1 is fixed to the front of a crank case 22 of the reciprocating compressor 2. A single motor 4 is mounted to the rear of the crank case 22. The motor 4 acts as power source for driving the scroll compressor 1 and the reciprocating compressor 2. [0011]The scroll compressor 1 comprises an involute fixed wrap 13 in the sealed housing 11 and an orbiting wrap 15 which engages with the fixed wrap 13 to form a compressing chamber 16. [0012]The fixed wrap 13 is provided on the rear surface of a fixed end plate 12, while the orbiting wrap 15 is provided on an orbiting plate 14 rotatably mounted in the housing 11. [0013]The orbiting plate 14 is rotatably mounted to an eccentric axial portion 42 of a driving shaft 41 which passes through a center of a cover 24 closing the rear surface of the housing 11 and is rotated by a motor 4. The cover 24 is also part of the crank case 22 of the reciprocating compressor 2. The orbiting plate 14 is eccentrically revolved with rotation of the driving shaft 41 and connected to the cover 24 with three pin-crank-type self-rotation preventing devices 17 positioned on a circle. [0014]In the outer circumference and center of the fixed end plate 12 of the housing 11, there are a scroll inlet 111 for sucking an external gas into the compressing chamber 16 and a scroll outlet 112 for discharging a primary compressed gas A compressed in the compressing chamber 16 respectively. [0015]When the orbiting end plate 14 is eccentrically revolved by the motor 4, the compressing chamber 16 defined by the fixed wrap 13 and the orbiting wrap 15 gradually reduces in volume from the outer circumference to the center. Thus, the external gas sucked from the scroll inlet 111 is gradually compressed towards the center and the primary compressed gas A is discharged from the scroll outlet 112. The primary compressed gas A from the scroll outlet 112 is forwarded to the reciprocating compressor 2 and partially introduced into the crank case 22 of the reciprocating compressor 2. [0016]In the reciprocating compressor 2, a piston 23 reciprocates in a cylinder 21 to suck and discharge a gas over and over. On the cylinder 23, there are a cylinder inlet 25 for introducing the primary compressed gas A discharged from the scroll outlet 112 into the cylinder 21 and a cylinder outlet 26 for discharging a secondary compressed gas B compressed in the cylinder 21. [0017]The piston 23 is reciprocated in the cylinder 21 with a crank shaft 43 of the driving shaft 41 driven by the motor 4 via a piston rod 27. [0018]In the upper part of the crank case 22, there is a crank-case inlet 221 for partially sucking the primary compressed gas A discharged from the scroll outlet 112 into the crank case 22. [0019]The piston 23 reciprocates in the cylinder 21, so that the primary compressed gas A is introduced from the cylinder inlet 25 via a suction valve 28 over the piston 23 in the cylinder 21 and further compressed. Then, high-pressure secondary compressed gas B is discharged from the cylinder outlet 26 via a discharge valve 26 and sent to the tank 3. [0020]During reciprocating motion of the piston 23, the primary compressed gas A discharged from the scroll outlet 112 of the scroll compressor 1 is partially introduced into the crank case 22 to allow the inside of the crank case 22 to be pressured to more than atmospheric pressure. Thus, difference in pressure between the compressed gas in the compressing chamber on the piston 23 and that in the crank case 22 is smaller than what has about atmospheric pressure in the crank case 22. Therefore, if difference in pressure between the upper surface and lower surfaces of the piston 23 is great, rapid and strong downward force acts onto the piston 23, so that excessive and unequal force is applied to the outer circumferential surface of the piston 23, the piston ring, a bearing and a sealing portion thereby causing early malfunction. In the embodiment of the present invention, difference in pressure becomes smaller to avoid the cause of early malfunction thereby discharging smaller high-pressure compressed gas efficiently. Continue reading about Combined compressing apparatus... Full patent description for Combined compressing apparatus Brief Patent Description - Full Patent Description - Patent Application Claims Click on the above for other options relating to this Combined compressing apparatus 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. Start now! - Receive info on patent apps like Combined compressing apparatus or other areas of interest. ### Previous Patent Application: No water / dead head detection pump protection algorithm Next Patent Application: Booster-type gas compressor Industry Class: Pumps ### FreshPatents.com Support Thank you for viewing the Combined compressing apparatus patent info. 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