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[0001] This application makes reference to, incorporates the same herein, and claims all benefits accruing under 35 U.S.C. §119 from an application for Compressor with Discharge Muffler earlier filed in the Korean Industrial Office on Dec. 11, 2000 and there duly assigned Serial No. 75129/2000 by that Office.
[0002] 1. Field of the Invention
[0003] The present invention relates generally to compressors used for refrigerators or the like, and more particularly to a compressor that is provided with a plurality of exhaust mufflers to reduce pressure pulsation generated during the exhaust of coolant.
[0004] 2. Description of the Prior Art
[0005] In general, a compressor is an apparatus, which is applied to the refrigeration cycle of a refrigerator or the like (in which coolant undergoes a compression process, a condensing process, an expansion process and an evaporation process, sequentially), and compresses low-temperature and low-pressure coolant into high-temperature and high-pressure coolant. Such a compressor may be classified into a linear compressor or reciprocating compressor according to its operating movement.
[0006] A conventional reciprocating compressor is comprised of a sealed container for constituting the outside of the compressor, a drive unit mounted in the sealed container for generating power, and a compression unit for sucking, compressing and exhausting coolant using power generated by the drive unit.
[0007] The drive unit is mounted in the upper portion of the interior of the sealed container. The drive unit is comprised of a stator, a rotor, and a rotating shaft having an eccentric portion at its lower end. The rotating shaft is forcibly inserted into the center portion of the rotor, thus being rotated, together with the rotor.
[0008] The compression unit is disposed in the lower portion of the interior of the sealed container. The compression unit is comprised of a cylinder head provided with suction and exhaust chambers for guiding the suction and exhaust of coolant, a cylinder block assembled with the cylinder head at its front end and provided with a compression chamber, a piston reciprocated through the compression chamber, and a connecting rod connected to the piston through an eccentric shaft for converting rotating movement into linear movement.
[0009] In addition, a suction muffler is situated just over the cylinder head to reduce noise generated during the inflow of coolant. A coolant suction conduit is connected to the suction muffler. Two exhaust mufflers are mounted at two positions under the cylinder block to be connected to the exhaust chamber so as to reduce pressure pulsation generated during the exhaust of high-pressure coolant. A coolant exhaust conduit is connected to one of the exhaust mufflers. One exhaust muffler connected to the coolant exhaust conduit is constructed in a space expansion type, while the other exhaust muffler not connected to the coolant exhaust conduit is constructed in a Helmholtz resonator type.
[0010] When the conventional reciprocating compressor constructed as described above is powered on, the rotating shaft is rotated together with the rotor, and the piston connected to the eccentric portion through the connecting rod is reciprocated through the compression chamber. Accordingly, coolant passes through the suction muffler and the suction chamber of the cylinder head, and flows into and is compressed in the compression chamber. Continuously compressed coolant is exhausted to the exhaust chamber of the cylinder head and the exhaust muffler.
[0011] Low-pressure coolant sucked by the movement of the piston toward the bottom dead center is compressed by the movement of the piston toward the top dead center, and compressed coolant is exhausted to the exhaust chamber of the cylinder head. A portion of compressed coolant is sent to the space expansion type exhaust muffler and the remaining portion is sent to the Helmholtz type exhaust muffler, so the pressure pulsation of coolant is reduced. In this case, owing to the pressure difference during the movement of the piston toward its bottom dead center, compressed coolant in the Helmholtz resonance type muffler passes through the exhaust chamber of the cylinder head, enters the space expansion type exhaust muffler, and thereafter is exhausted to the outside.
[0012] However, in the conventional reciprocating compressor, compressed coolant in the Helmholtz resonance type exhaust muffler passes through the exhaust chamber of the cylinder bead and enters the space expansion type exhaust muffler, so the peak of pressure pulsation is changed during the recombination of coolant, resulting in the problem of creating a noise having a different frequency band.
[0013] Additionally, many factors, such as the volume of the exhaust muffler affecting the natural frequency of the Helmholtz resonance type exhaust muffler and the length and sectional area of the coolant passage connecting the exhaust chamber and the exhaust muffler, should be taken into account so as to reduce a noise generated in the exhaust chamber of the cylinder head, thus making the adjustment of the factors difficult to achieve.
[0014] Accordingly, the present invention has been made keeping in mind the above problems occurring in the prior art, and an object of the present invention is to provide a compressor with mufflers, which is capable of considerably reducing the exhaust noises of coolant in such a way that noises created in the exhaust mufflers by pressure pulsation are cancelled out by destructive interference during the recombination of coolant by directly connecting the exhausting mufflers to one another.
[0015] In order to accomplish the above object, the present invention provides a compressor, comprising: a drive unit for generating power; a compression unit for sucking, compressing and exhausting coolant by power transmitted from the drive unit; at least a pair of exhaust mufflers in which coolant exhausted from the compressing unit is temporarily stored; a coolant exhaust conduit connected to one of the exhaust mufflers to guide the exhaust of coolant to the outside; and a connecting conduit connecting the exhaust mufflers to each other to cancel out noises during the recombination of divided coolant in one of the exhaust mufflers.
[0016] The connecting conduit is preferably constructed to have a length such that a first noise in a first exhaust muffler of the exhaust mufflers is allowed to be opposite in phase to a second noise in a second exhaust muffler after being transmitted to the second exhaust muffler.
[0017] Under the conditions that the frequency bands of the noises generated in the exhaust mufflers are 350 to 600 Hz and the transmission speed of a noise in coolant is 161 m/s, the connecting conduit preferably has a length ranging from 13.4 to 23 cm.
[0018] In addition, the present invention provides a compressor, comprising: a drive unit for generating power; a compression unit for sucking, compressing and exhausting coolant utilizing power transmitted from the drive unit; at least a pair of exhaust mufflers in which coolant exhausted from the compressing unit is temporarily stored; a coolant exhaust conduit connected to one of the exhaust mufflers to guide the exhaust of coolant to the outside; at least a pair of coolant passages each connecting the compression unit to each of the exhaust mufflers, the coolant passages having different lengths so that noises of coolant have opposite phases after the coolant passes through the coolant passages; and a connecting conduit connecting the exhaust mufflers to each other to cancel out the noises having opposite phases during the recombination of divided coolant in one of the exhaust mufflers.
[0019] The above and other objects, features and other advantages of the present invention will be more clearly understood from the following detailed description taken in conjunction with the accompanying drawings, in which:
[0020]
[0021]
[0022]
[0023]
[0024]
[0025] Reference now should be made to the drawings, in which the same reference numerals are used throughout the different drawings to designate the same or similar components.
[0026] A reciprocating compressor in accordance with the present invention is comprised of a sealed container
[0027] The sealed container
[0028] The drive unit
[0029] The compression unit
[0030] The exhaust mufflers
[0031] First of all, the exhaust mufflers
[0032] Coolant passages
[0033] A connecting conduit
[0034] In this case, the connecting conduit
[0035] The determination of the length of the connecting conduit
[0036] In order to allow the noise in the left exhaust muffler
[0037] where L is the length of the connecting conduit
[0038] By way of example, under the conditions that the frequency “c” of the noises generated in the exhaust mufflers
[0039] As a result, after the noise in the left exhaust muffler
[0040] In the reciprocating compressor, a noise having a certain frequency band can be easily eliminated by varying the length L of the connecting conduit
[0041] Hereinafter, the operation and effects of the reciprocating compressor of the present invention are described in detail.
[0042] When the reciprocating compressor of the present invention is powered on, the rotor
[0043] Accordingly, the piston
[0044] In the meantime, a portion of compressed coolant exhausted to the exhaust chamber
[0045] As shown in
[0046] Thereafter, the compressed coolant sent to the right exhaust muffler
[0047] While the noise “B” in the left exhaust muffler
[0048] As a result, while the compressed coolant in the left exhaust muffler
[0049] Meanwhile, although the noises are described as being canceled out by the adjustment of the length L of the connecting conduit
[0050] In more detail, in order to allow the phases of noises to be opposite after the compressed coolant is sent to the exhaust mufflers
[0051] Accordingly, the noise generated during the exhaust of coolant from the exhaust chamber
[0052] The compressed coolant sent to the left exhaust muffler
[0053] As described above, the present invention provides a compressor with exhaust mufflers in which a pair of exhaust mufflers is symmetrically arranged under its cylinder block, a coolant exhaust conduit is connected to one of the exhaust mufflers and the exhaust mufflers are connected by a connecting conduit to communicate with each other. In this case, the length of the connecting conduit is designed so as to allow the phase of the noise of coolant contained in one of the exhaust mufflers to be opposite to the phase of the noise of the coolant contained in the other exhaust muffler after the transmission of the noise of the former exhaust muffler. As a result, noises are cancelled out by destructive interference while the compressed coolant sent to a pair of exhaust mufflers are recombined with each other through the connecting conduit, so the entire noises of compressed coolant are considerably reduced. Additionally, a noise having any frequency band can be easily eliminated by varying the length of the connecting conduit.
[0054] Although the preferred embodiments of the present invention have been disclosed for illustrative purposes, those skilled in the art will appreciate that various modifications, additions and substitutions are possible, without departing from the scope and spirit of the invention as disclosed in the accompanying claims.