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CompressorRelated Patent Categories: Pumps, Expansible Chamber Type, Having Pumping Chamber Pressure Responsive DistributorCompressor description/claimsThe Patent Description & Claims data below is from USPTO Patent Application 20070148026, Compressor. Brief Patent Description - Full Patent Description - Patent Application Claims
TECHNICAL FIELD [0001] The present invention relates to a compressor. In particular, it relates to measures against a loss of discharge pressure. BACKGROUND ART [0002] So far, compressors have been used in air conditioners and the like to compress a refrigerant in a refrigerant circuit. A known example of such compressors is a rotary compressor including a compressor mechanism and a motor for driving the compressor mechanism in a hermetic casing. [0003] When the motor is driven, a piston revolves in a cylinder chamber of the compressor mechanism. According to the revolutions, a low pressure refrigerant is sucked into a suction chamber through a suction pipe, compressed to raise its pressure in a compressor chamber, and then discharged out to space in the casing through a discharge port. [0004] The discharge port is generally provided with a flat reed valve. When the pressure in the compressor chamber exceeds a certain value, a distal end of the reed valve is warped to open the discharge port. After the refrigerant is discharged out of the compressor chamber to the space in the casing, the reed valve closes the discharge port by spring force of its own. [0005] In the compressor mechanism as described above, however, reexpansion of the compressed refrigerant occurs to reduce the efficiency of the compressor (loss by reexpansion). Specifically, even after the discharge operation of the refrigerant, part of the refrigerant still remains in the volume of the discharge port, i.e., a dead volume. The remaining refrigerant reexpands in the compressor chamber to reduce volume efficiency. [0006] To solve the above-described problem, for example, Japanese Unexamined Patent Publication No. 2001-280254 proposes a compressor provided with a reed valve having a protruding part to be fitted in the discharge port, i.e., a so-called poppet valve. According to the compressor, the protruding part of the reed valve is fitted in the discharge port after the discharge is terminated, thereby reducing the dead volume. Therefore, the refrigerant remains less in the dead volume. Problem to Solve [0007] When the reed valve of the compressor is lifted to the maximum level (full open state), the protruding part of the reed valve may possibly reduce the area of a flow passage formed in the discharge port. The reduced flow passage area causes flow resistance, thereby increasing a loss of discharge pressure. Further, when the reed valve is lifted to the maximum level, the refrigerant flows at high speed and the flow resistance is likely to increase. Thus, the reduction in flow passage area leads to a problem of increase in loss of discharge pressure. [0008] The present invention has been achieved in view of the above-described problem. An object of the present invention is to reduce the loss of discharge pressure by forming a flow passage whose area is not reduced at any part of the discharge port at least when the reed valve is lifted to the maximum level to increase the flow rate. DISCLOSURE OF THE INVENTION [0009] The present invention solves the problem as described below. [0010] Specifically, a compressor according to a first aspect of the present invention includes a reed valve (41) which opens and closes a discharge port (29) of a compressor mechanism (20) and includes a flat part (41a) and a protruding part (41b) formed at a distal end of the flat part (41a) to come in and out of the discharge port (29), wherein the shape of the discharge port (29) and the shape of the reed valve (41) are determined to satisfy S2.gtoreq.S1.gtoreq.S0 wherein S0 is an opening area of an inlet (29a) of the discharge port (29), S1 is the smallest sectional area of a flow passage formed between the protruding part (41b) and the discharge port (29) when the reed valve (41) is lifted to the maximum level and S2 is the smallest sectional area of a flow passage formed between the flat part (41a) and the outer periphery of an outlet (29b) of the discharge port (29) when the reed valve (41) is lifted to the maximum level. [0011] According to the first aspect of the present invention, as shown in FIG. 4, the flow passage areas S0, S1 and S2 at different parts of the discharge port (29) satisfy S2.gtoreq.S1.gtoreq.S0 when the reed valve (41) is lifted to the maximum level. Therefore, the flow passage area is not reduced at any part of the discharge port (29). Specifically, the amount of a compressed fluid flow will never be reduced during the period from when the fluid enters the discharge port (29) through the inlet (29a) to flow between the discharge port (29) and the protruding part (41b) until the fluid passes between the discharge port (29) and the flat part (41a). Accordingly, flow resistance caused by reduction in flow passage area is less likely to occur and a loss of discharge pressure is reduced. In particular, as the above-described effect is achieved when the reed valve (41) is lifted to the maximum level, i.e., when the fluid flows at high speed and the flow resistance is likely to increase, the loss of discharge pressure is reduced with efficiency. [0012] According to a second aspect of the present invention related to the first aspect of the present invention, the discharge port (29) is tapered from the outlet (29b) to the inlet (29a). [0013] According to the second aspect of the present invention, the flow passage area S1 of the discharge port (29), i.e., the smallest sectional area of a flow passage formed between the discharge port (29) and the protruding part (41b), increases with reliability. Accordingly, the flow passage area S1 surely becomes equal to or larger than the opening area S0 of the inlet (29a) of the discharge port (29). [0014] According to a third aspect of the present invention related to the first or second aspect of the present invention, a seat (22b) is formed at the outer periphery of the outlet (29b) of the discharge port (29) such that the seat (22b) contacts the flat part (41a). [0015] According to the third aspect of the present invention, the flat plate (41a) contacts the outer periphery of the outlet (29b) of the discharge port (29) to seal the discharge port (29). Accordingly, there is no need of adjusting the shape of the protruding part (41b) to the shape of the discharge port (29), though it is required in the case where the discharge port (29) is sealed by contact between the protruding part (41b) and the inner surface of the discharge port (29). Thus, the protruding part (41b) is made smaller than the discharge port (29) and the smallest sectional area S1 of the flow passage formed between the discharge port (29) and the protruding part (41b) increases with reliability. Effect [0016] According to the first aspect of the present invention, the shape of the discharge port (29) and the shape of the reed valve (41) are determined to satisfy S2.gtoreq.S1.gtoreq.S0 wherein S0 is an opening area of an inlet (29a) of the discharge port (29), S1 is the smallest sectional area of a flow passage formed between the protruding part (41b) and the discharge port (29) when the reed valve (41) is lifted to the maximum level and S2 is the smallest sectional area of a flow passage formed between the flat part (41a) and the outer periphery of an outlet (29b) of the discharge port (29) when the reed valve (41) is lifted to the maximum level. Therefore, the amount of a fluid flow will never be reduced during the period from when the fluid enters the discharge port (29) through the inlet (29a) until the fluid passes between the discharge port (29) and the flat part (41a). As the flow passage area is not reduced, flow resistance caused by reduction in flow passage area is prevented from occurring. Therefore, even during high speed operation when the fluid flows faster and is likely to receive greater flow resistance, the loss of discharge pressure is reduced with efficiency. As a result, the efficiency of the compressor improves. [0017] According to the second aspect of the present invention, the discharge port (29) is tapered from the outlet (29b) to the inlet (29a). Therefore, the smallest sectional area S1 of the flow passage formed between the discharge port (29) and the protruding part (41b) when the reed valve (41) is lifted to the maximum level increases as compared with the case where the discharge port (29) is cylindrical. Thus, the smallest sectional area S1 is surely made equal to or larger than the flow passage area S0 and the flow resistance caused by reduction in flow passage area is surely prevented from occurring. [0018] According to the third aspect of the present invention, the seat (22b) is provided at the outer periphery of the outlet (29b) of the discharge port (29). Accordingly, there is no need of adjusting the shape of the protruding part (41b) to the shape of the discharge port (29), though it is required in the case where the discharge port (29) is sealed by contact between the protruding part (41b) and the inner surface of the discharge port (29). Thus, the protruding part (41b) is made smaller than the discharge port (29). Moreover, the flow passage area S1 is made larger to prevent the occurrence of the flow resistance caused by reduction in flow passage area. BRIEF DESCRIPTION OF DRAWINGS Continue reading about Compressor... Full patent description for Compressor Brief Patent Description - Full Patent Description - Patent Application Claims Click on the above for other options relating to this 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 Compressor or other areas of interest. ### Previous Patent Application: Compressor Next Patent Application: Rotary pump provided with an axially movable blade Industry Class: Pumps ### FreshPatents.com Support Thank you for viewing the Compressor patent info. IP-related news and info Results in 0.14073 seconds Other interesting Feshpatents.com categories: Software: Finance , AI , Databases , Development , Document , Navigation , Error 174 |
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