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  Hermetic compressor and manufacturing method of suction mufflerUSPTO Application #: 20070059189Title: Hermetic compressor and manufacturing method of suction muffler Abstract: This relates to a hermetic compressor and a manufacturing method of a suction muffler, and discloses a technique for making energy efficiency higher and reducing noise. According to that technique, in a suction muffler 140 having a sound attenuation space 143, by foam-molding a wall 147, such as an opposite surface and the like, where open ends 145a, 146a within the sound attenuation space among the walls constituting a casing 140C of the suction muffler 140 are opened, it is possible to reduce the heating action of refrigerant gas released into the sound attenuation space 143 effectively in a space-saving manner, and make a sucking efficiency higher, and effectively absorb a refrigerant pulsation tone radiated in the open end 145a within the sound attenuation space, and consequently reduce the noise. (end of abstract) Agent: Stevens, Davis, Miller & Mosher, LLP - Washington, DC, US Inventors: Akira Nakano, Ko Inagaki USPTO Applicaton #: 20070059189 - Class: 417415000 (USPTO) Related Patent Categories: Pumps, Motor Driven, Electric Or Magnetic Motor, Reciprocating Rigid Pumping Member The Patent Description & Claims data below is from USPTO Patent Application 20070059189. Brief Patent Description - Full Patent Description - Patent Application Claims
TECHNICAL FIELD [0001] The present invention relates to a hermetic compressor for use in a refrigerator, an air conditioner, a freezing refrigerating apparatus or the like, and more particularly relates to its suction muffler and an improvement of its manufacturing method. BACKGROUND ART [0002] In recent years, a hermetic compressor used in a freezing refrigerating apparatus or the like strongly desires that energy efficiency is high, in addition to a fact that the noise caused by an operation is low. [0003] As a conventional hermetic compressor, there is a hermetic compressor whose energy efficiency is improved by improving the sound attenuation effect of a suction muffler and effectively using the sound attenuation effect and consequently increasing the refrigerant circulation quantity into a compression chamber (for example, refer to the following patent document 1). [0004] Also, there is a hermetic compressor whose energy efficiency is improved by maintaining the refrigerant gas, which is returned from a freezing cycle, at the state of a low temperature and high density and sucking into the compression room (for example, refer to the following patent document 2). [0005] Patent Document 1: Laid-open Unexamined Patent Publication No. 2003-42064 [0006] Patent Document 2: Laid-open Unexamined Patent Publication No. 11-303739 [0007] The configuration of the above-mentioned conventional hermetic compressor will be described below with reference to the drawings. [0008] FIG. 17 is a sectional view of the conventional hermetic compressor, FIG. 18 is a sectional view of a suction muffler in FIG. 19, and FIG. 19 is a flow velocity vector diagram showing the behavior of the refrigerant gas by using the flow vector within the suction muffler shown in FIG. 18. [0009] In FIG. 17, a hermetic vessel 1 accommodates: a motor element 5 composed of a rotator 4 and a stator 3 holding a coil portion 2; and a compression element 6 driven by the motor element 5. A lubricating oil 8 is stored in the hermetic vessel 1. [0010] The schematic configuration of the compression element 6 will be described below. A crank shaft 10 has: a main shaft portion 11 where the rotator 4 is press-fitted and fixed; and an eccentric portion 12 formed eccentrically to the main shaft portion 11. Inside the main shaft portion 11, an oil pump 13 is placed so as to be opened in the lubricating oil 8. [0011] A cylinder block 20 formed above the motor element 5 has: a compression room 22 that is approximately cylindrical; and a shaft supporter 23 that supports the main shaft portion 11 with a shaft. A piston 30 is inserted into the compression chamber 22 of the cylinder block 20 so as to be reciprocatingly slidable therein, and linked to the eccentric portion 12 by a linking device 31. [0012] A valve plate 35 for sealing the open end surface of the compression room 22 has a suck hole 38 to be linked to the compression room 22 in accordance with the opening/closing action of a suction valve 34. A cylinder head 36 is fixed through the valve plate 35 to the opposite side to the compression room 22. [0013] A suction tube 37 is fixed to the hermetic vessel 1 and connected to the low pressure side (not shown) of a freezing cycle, and introduces the refrigerant gas (not shown) into the hermetic vessel 1. A suction muffler 40 is fixed because it is interposed between the valve plate 35 and the cylinder head 36, and it is made of synthetic resin, such as polybutylene telephthalate and the like, to which glass fiber is mainly added. [0014] In FIG. 18, the suction muffler 40 has a sound attenuation space 43 and also has: a second linkage path 46 where an open end 46b is linked into the hermetic vessel 1 and an open end 46a is opened while extended to the sound attenuation space 43; and a first linkage path 45 where an open end 45b is linked to the suck hole 38 of the valve plate 35 and an open end 45a is opened while extended to the sound attenuation space 43. [0015] FIG. 19 shows flow velocity vectors 60 indicating the behavior of the refrigerant gas within the suction muffler 40 obtained by a computer simulation. The length of each vector indicates the magnitude of the flow velocity, and the orientation of the vector indicates the flow direction of the refrigerant gas. [0016] Also, respective arrows indicate an upper eddy 61 generated by the upstream flows in the refrigerant gas sucked from the open end 46a of the second linkage path 46, and a lower eddy 62 generated by the downstream flow in the refrigerant gas sucked from the open end 46a of the second linkage path 46. [0017] The operation of the conventional hermetic compressor configured as mentioned above will be described below. [0018] When the rotator 4 of the motor element 5 rotates the crank shaft 10, since the rotation motion of the eccentric portion 12 is transmitted through the linking device 31 to the piston 30, the piston 30 reciprocates inside the compression room 22. Due to this operation, the refrigerant gas is introduced into the hermetic vessel 1 through the suction tube 37 from the cooling system (not shown). The refrigerant gas introduced into the hermetic vessel 1 is sucked from the open end 46b of the suction muffler 40, and released to the sound attenuation space 43 from the open end 46a. [0019] The released refrigerant gas, after colliding with the wall of the casing of the suction muffler 40 that is close and opposite to the open end 46a as shown in FIG. 19, generates the upper eddy 61 and the lower eddy 62, and circulates through the sound attenuation space 43. After that, the refrigerant gas mainly constituted by the upper eddy 61 is sucked from the open end 45a to the first linkage path 45 and introduced into the suck hole 38 opened in the valve plate 35. [0020] Then, when the suction valve 34 is opened, the refrigerant gas is sucked into the compression room 22, and compressed by the reciprocating motion of the piston 30, and discharged into the cooling system. [0021] Here, the pressure pulsation of the refrigerant induced when the refrigerant is sucked into the compression room 22 is propagated in the direction opposite to the flow of the refrigerant as mentioned above and propagated from the open end 45a to the sound attenuation space 43. Here, since the first linkage path 45 is extended into the sound attenuation space 43 where the sound attenuation effect is high, and the open end 45a is located in the node of the sound, for example, in the 3 to 4 kHz region where the noise becomes troublesome, it is possible to obtain the high sound attenuation effect in a particular frequency band. [0022] Also, the noise pulsation attenuated in the sound attenuation space 43 is further attenuated by adjusting the dimension of the sound attenuation space 43 and the length and inner diameter of the second linkage path 46. Thus, it is possible to obtain the higher sound attenuation effect. [0023] Also, FIG. 20 shows a sectional view of a suction muffler of another conventional hermetic compressor. Another conventional example will be described below with reference to the drawings. By the way, the entire configuration except the suction muffler is similar to the above-mentioned conventional example. Thus, the detailed explanation is omitted. [0024] In FIG. 20, a suction muffler 50 has a resonant space 58 placed so as to surround a suction space 57. In a second linkage path 56, one end is linked to the hermetic vessel 1, and the other end is linked o the suction space 57. In a first linkage path 55, an open end 55a is opened to the suction space 57, and the other end is linked through the suction valve 34 to the compression room 22, and this has a linkage hole 59 to link the first linkage path 55 and the resonant space 58. Continue reading... Full patent description for Hermetic compressor and manufacturing method of suction muffler Brief Patent Description - Full Patent Description - Patent Application Claims Click on the above for other options relating to this Hermetic compressor and manufacturing method of suction muffler 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 Hermetic compressor and manufacturing method of suction muffler or other areas of interest. ### Previous Patent Application: Aerodynamically enhanced bearing housing pocket geometry Next Patent Application: Automobile compressor piston Industry Class: Pumps ### FreshPatents.com Support Thank you for viewing the Hermetic compressor and manufacturing method of suction muffler patent info. 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