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Booster-type gas compressorRelated Patent Categories: Pumps, Motor Driven, Fluid Motor, Rectilinearly Reciprocating Cylinder And Piston-type Motor, Rectilinearly Reciprocating Cylinder And Piston-type PumpBooster-type gas compressor description/claimsThe Patent Description & Claims data below is from USPTO Patent Application 20070160483, Booster-type gas compressor. Brief Patent Description - Full Patent Description - Patent Application Claims
BACKGROUND OF THE INVENTION [0001] The present invention relates to a booster-type gas compressor in which a compressed gas is further compressed by a reciprocating piston. [0002] As shown in FIG. 4, a suction valve 23 is provided at one side of a top wall 22 of a cylinder 21 and a discharge valve 24 is provided at the other side of the top wall 22. Above the suction valve 23 and the discharge valve 24, there are a suction chamber 26 having an inlet 25 and a discharge chamber 28 having an outlet 27 respectively. Under the cylinder 21, a crank shaft 31 integrally formed with a driving shaft 30 in a crank case 29 is provided. The driving shaft 30 is driven by an electric motor 34 in a motor case 33 mounted to a side wall 29a of the crank case 29 so that a gas may pass through. A piston 39 is moved up and down in a cylinder 21 via a piston rod 35 by the crank shaft 31 formed with the driving shaft 30 to compress a gas such as N.sub.2 introduced in a compressing chamber above the piston 36 via the suction valve 23 and to discharge it from the discharge valve 24 and outlet 27. [0003] In such a reciprocating-piston-type gas compressor, with reciprocating motion of the piston 36, a compressed gas in the compressing chamber above the piston 36 in the cylinder 21 partially leaks through around the piston 36 into the crank case 29. [0004] The compressed gas in the crank case 29 Is partially discharged from an air hole 38 of the crank case 29 to produce loss of energy. Leak of a toxic gas causes air pollution. [0005] Furthermore, in case that such a reciprocating-piston-type gas compressor comprises a booster-type gas compressor sucking a compressed gas and compressing it to higher pressure, in a suction step of restarting or unloading operation, the compressing chamber becomes decompression condition in which a atmospheric pressure gas from an air hole 38 of the crank case 29 flows through around the piston 36 to the compressing chamber above the piston 36 and is mixed in a gas from the suction hole 25 to render density lowered. [0006] To cool the electric motor 34, a ventilating hole 39 is formed in the electric motor case 33 or a fan is mounted to the driving shaft 30 to achieve forcing cooling. Thus, the electric motor 34 cannot be completely sealed to render noise leaked or dusts, and solid ingredients in external air are likely to remain in the electric motor 34 or motor case 33. [0007] Furthermore, in such a booster-type gas compressor, atmospheric pressure remains in the crank case 29. So, owing to pressure difference above and under the piston 36, torque variation in one rotation becomes greater to increase an electric current of the electric motor 34 directly mounted to the crank case 29 to speed up damages on the outer circumferential surface of the piston 36, a piston ring, the driving shaft 30, bearings 41,42 of the crank shaft 31 and a seal of a sliding portion. SUMMARY OF THE INVENTION [0008] An object of the present invention is to provide a booster-type gas compressor comprising a reciprocating piston, pressure difference being reduced between a compressing chamber above the piston and a crank case under the piston thereby preventing wear of each part and unsmoothness of the operation. BRIEF DESCRIPTION OF THE DRAWINGS [0009] 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: [0010] FIG. 1 is a vertical sectional view of the first embodiment of a booster-type gas compressor according to the present invention; [0011] FIG. 2 is a vertical sectional view of the second embodiment of a booster-type gas compressor according to the present invention; [0012] FIG. 3 is a vertical sectional view of the third embodiment of a booster-type gas compressor according to the present invention; and [0013] FIG. 4 is a vertical sectional view of a known booster-type gas compressor DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS [0014] FIG. 1 shows the first embodiment of a booster-type gas compressor according to the present invention. [0015] The basic structure of the booster-type gas compressor is not so different from that in FIG. 4. The same numerals are allotted to the same members. Its description is omitted and only differences are described. [0016] In FIG. 1, there is no air hole 38 communicating external air and a compressed-gas introducing hole 11 is formed in an electric motor case 36 instead of a ventilating hole. [0017] A compressed-gas feeding path 37 is connected to a compressed-gas introducing hole 11 via a bypath conduit 14 comprising a check valve 12 that closes towards the compressed-gas feeding path 37 and opens in an opposite direction and a pressure regulator 13 such as a pressure-regulating valve or a pressure reducing valve. [0018] By opening a valve (not shown), a compressed gas is fed into a suction chamber 26 and partially introduced into the crank case 29 via the bypath conduit 14 comprising the check valve 12 and the pressure regulator 13, the compressed-gas introducing hole 11. a motor case 33 and a communicating hole 32 to let the inside of the crank case 29 compressed to more than atmospheric pressure. [0019] The compressed gas in the compressed-gas feeding path 37 is partially fed into the crank case 29, so that gas pressure in the crank case 29 becomes more than atmospheric pressure different from a known device. [0020] Thus, difference in pressure between a compressing chamber above a piston 36 in a cylinder 21 and the inside of the crank case 29 becomes smaller than that in a known device, thereby preventing sliding of the piston 36 from lacking smoothness and preventing each of the bearings 41,42 and preventing a seal from reducing their lives or producing looseness caused by unequal force. Continue reading about Booster-type gas compressor... Full patent description for Booster-type gas compressor Brief Patent Description - Full Patent Description - Patent Application Claims Click on the above for other options relating to this Booster-type gas compressor 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 Booster-type gas compressor or other areas of interest. ### Previous Patent Application: Combined compressing apparatus Next Patent Application: Booster-type gas compressor Industry Class: Pumps ### FreshPatents.com Support Thank you for viewing the Booster-type gas compressor patent info. 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