Patent Description:
A compressor refers to a mechanical device that increases pressure by compressing gas, and is divided into a reciprocating type compressor and a rotary type compressor according to the operating principle. The reciprocating type compressor is a type that converts a rotational motion of a motor into a linear reciprocating motion of a piston through a crankshaft and a connecting rod to suck and compress gas. Examples of the rotary type compressor include a rotary compressor that sucks and compresses gas while a roller rotates in a cylinder by a rotational motion of a motor and a scroll compressor that continuously sucks and compresses gas while a turning scroll performs an orbital motion in a certain direction from a center of a fixed scroll by a rotational motion of a rotary compressor for performing compression and a motor. In these compressors, a muffler is typically used to reduce noise. However, as the compressors have recently become more efficient, noise is greatly increased, so the existing mufflers have limitations in reducing noise.

In addition, the existing compressor is provided with a noise reduction resonator provided in a compression space to reduce noise. The noise reduction resonator provided in the compression space as described above has a problem of reducing the compression efficiency of the compressor.

In addition, a technology to reduce noise by employing a multi-Helmholtz resonator on an upper flange of a compressor cylinder has been announced in a paper published by the <NPL> et al. However, since the resonator of the prior art is located downward in the traveling direction of the gas flow path, foreign matter or liquid may be accumulated when used for a long period of time, thereby reducing the noise reduction effect. <CIT> discloses a compressor including a cylinder and a resonator. <CIT> discloses a compressor including a cylinder and a resonator. <CIT> discloses a rotary compressor in which compressor noise is reduced by forming a sound absorbing part in a discharge passage of a cylinder. <CIT> discloses a compressor including a first muffler chamber communicating with a first cylinder chamber, and a second muffler chamber communicating with a second muffler chamber. <CIT> discloses that a resonator structure of rotary compressor is provided to improve the compressor efficiency by forming a resonator on a barring facing to a discharging port and preventing the deformation of the barring due to the mounting of the resonator, and reduce the noise by forming a passage communicating the resonator with the compressing chamber. <CIT> discloses a rotary compressor which includes a compression mechanism, motor and hermetically sealed housing. <CIT> discloses that a hermetic rotary compressor is provided to allow the compressor to be easily manufactured, while effectively reducing the noise produced during compression.

Accordingly, an object of the invention is to provide a compressor having a noise reduction resonator capable of maintaining a noise reduction effect even when used for a long period of time and an electronic device using the same.

According to an aspect of the invention, there is provided a compressor as set out in claim <NUM>.

The compression part may include a cylinder forming the compression space, and the first gas moving part may include: a lower flange coupled to a lower portion of the cylinder and having a gas discharge port for discharging the gas compressed in the compression space; and a lower muffler coupled to the lower flange to form the first gas flow path. As a result, in the rotary type compressor, the lower flange located above the gas flow path above a traveling direction of the gas flow path located between the lower flange and the lower muffler may be provided with a noise reduction resonator.

The compression part may include a cylinder forming the compression space, and the first gas moving part may include: an upper flange coupled to an upper portion of the cylinder and having a gas discharge port for discharging the gas compressed in the compression space; and an upper muffler coupled to the upper flange to form the first gas flow path.

The compressor may further include: a second gas moving part having a second gas flow path through which the gas discharged from the compression space moves, the second gas moving part may include: an upper flange coupled to an upper portion of the cylinder and having a gas discharge port for discharging the gas compressed in the compression space; and an upper muffler coupled to the upper flange to form the second gas flow path, and the second gas moving part may be provided with a second resonator configured to communicate with the second gas flow path and having a resonance space depressed upward in a moving direction of the gas.

The compressor may further include: a second gas moving part having a second gas flow path through which the gas discharged from the compression space moves, the second gas moving part may include: an upper flange coupled to an upper portion of the cylinder and having a gas discharge port for discharging the gas compressed in the compression space; and an upper muffler coupled to the upper flange to form the second gas flow path, and the second gas moving part may be provided with a second resonator configured to communicate with the second gas flow path and having a resonance space depressed downward in a moving direction of the gas.

The second gas moving part may include a third gas flow path, and the first gas flow path and the third gas flow path may be connected to each other.

The second gas flow path and the third gas flow path may communicate with each other.

The first gas moving part may be further provided with a second resonator configured to communicate with the first gas flow path and having a resonance space depressed upward in a moving direction of the gas, and the second resonator may be configured to be depressed across the lower flange and the cylinder.

The first gas moving part may be further provided with a second resonator configured to communicate with the first gas flow path and having a resonance space depressed upward in a moving direction of the gas, and the second resonator may have a resonance space having a depth different from that of the first resonator.

The first resonator may be located within a range of <NUM>° from the gas discharge port with respect to a center of the lower flange.

The first resonator may include an inlet part configured to communicate with the first gas flow path, a neck part configured to extend from the inlet part, and a chamber configured to extend from the neck part and having a larger diameter than the neck part.

The inlet part may include an inclined portion configured to be inclined to narrow toward the neck part.

The inlet part may include a multi-stage inclined portion configured to be inclined in multi-stage so as to be narrowed toward the neck part.

The inlet part may include an inclined portion configured to be inclined at a predetermined curvature so as to be narrowed toward the neck part.

The chamber and the neck part may each have a cylindrical shape that has a first diameter dc and a second diameter dn, and the second diameter dn may be <NUM> to <NUM>% relative to the first diameter dc.

The chamber and the neck part may each have a cylindrical shape having a first diameter dc and a second diameter dn, the inlet part may have a truncated cone shape configured to decrease from a maximum diameter demax to a minimum diameter demin, and the maximum diameter demax may be greater than the first diameter dc.

According to another aspect of the present disclosure, an electronic device including a compressor includes: a cylinder having a compression space in which introduced gas is accommodated, and configured to compress and discharge the gas in the compression space; and a lower flange coupled to the lower part of the cylinder; a lower muffler coupled to a bottom surface portion of the lower flange and having an inner surface portion forming a gas flow path through which the gas discharged from the compression space moves together with the bottom surface portion of the lower flange; and a resonator formed on a bottom surface portion of the lower flange and configured to communicate with the gas flow path and having a resonance space depressed upward in a moving direction of the gas.

According to the invention, the compressor has no reduction in compression efficiency, and can maintain the noise reduction efficiency even when used for a long period of time.

Hereinafter, in this document, a compressor <NUM> used in electronic devices such as an air conditioner, a refrigerator, and a freezer will be described in detail with reference to the accompanying drawings. Embodiments described below describe a sealed reciprocating type compressor <NUM> to aid understanding of the invention, which is illustrative. Unlike the embodiments described herein, it should be understood that various modifications such as a reciprocating type compressor and a scroll compressor may be implemented.

<FIG> is a perspective view illustrating an internal configuration of a sealed rotary compressor <NUM> according to an embodiment of the invention. A sealed rotary compressor <NUM> according to an embodiment of the invention includes a sealed container <NUM> having an internal space, a rotating shaft <NUM> rotatably extending up and down in the container <NUM>, a motor <NUM> provided on one side of the rotating shaft <NUM>, a compression part <NUM> provided on the other side of the rotating shaft <NUM>, and a gas moving part <NUM> that discharges and moves gas compressed in the compression part <NUM>.

The sealed container <NUM> has a cylindrical shape and accommodates the rotating shaft <NUM>, the motor <NUM>, the compression part <NUM>, and the gas moving part <NUM> in an inner space.

The rotating shaft <NUM> is rotatably installed in a center of the sealed container <NUM> in a vertical direction. The rotating shaft <NUM> is coupled to a rotor <NUM> of the motor <NUM> on one side of an upper portion thereof. The rotating shaft <NUM> is coupled to a roller <NUM> of the compression part <NUM> on the other side of a lower portion thereof. Therefore, the rotating shaft <NUM> rotates as the rotor <NUM> of the motor <NUM> rotates, and as a result, the roller <NUM> of the lower compression part <NUM> also rotates.

The motor <NUM> includes the rotor <NUM> fixed to the rotating shaft <NUM> and a stator <NUM> spaced apart from the rotor <NUM> at a predetermined interval. The rotor <NUM> is usually composed of a permanent magnet. The stator <NUM> is composed of a coil wound multiple times. In the motor <NUM>, when a current is applied to the coil of the stator <NUM>, a magnetic field is generated to make the stator <NUM> interact with the permanent magnet of the rotor <NUM> adjacently disposed thereto, thereby rotating the rotor <NUM>. As the rotor <NUM> rotates, the rotating shaft <NUM> also rotates, and as a result, a torque of the motor <NUM> causes the roller <NUM> at the other end of a lower portion thereof to rotate through the rotating shaft <NUM>.

<FIG> is a perspective view illustrating a coupled state of the compression part <NUM> and the gas moving part <NUM> in a compressor according to the embodiment of the invention, and <FIG> and <FIG> are exploded perspective views of the compression part <NUM> and the gas moving part <NUM> in the compressor <NUM> according to the embodiment of the invention.

The compression part <NUM> includes a cylinder <NUM> having a cylindrical compression space CS therein, a roller <NUM> provided in the cylinder <NUM>, a plate-shaped vane <NUM> blocking between an inner wall of the cylinder <NUM> and an outer wall of the roller <NUM>, a spring (see <NUM> in <FIG>) so that the vane <NUM> elastically protrudes toward the outer wall of the roller <NUM>, a bottom surface portion <NUM> of an upper flange <NUM> shielding an upper portion of the compression space CS of the cylinder <NUM>, and a top surface portion <NUM> of a lower flange <NUM> shielding a lower portion of the compression space CS of the cylinder <NUM> The compressor <NUM> illustrated in <FIG> has been described as a structure in which gas is discharged to the upper portion or the lower portion and a single roller and cylinder are used, which is only one example for explanation. That is, the structure in which the gas is discharged to either the upper portion or the lower portion or to the side surface, or two or more rollers and cylinders are used may be applied.

The cylinder <NUM> includes a gas suction port <NUM> that communicates with the cylindrical compression space CS by penetrating through the side surface, and a gas discharge channel <NUM> that depressed concavely up and down in the inner wall of the compression space CS and extends.

The cylinder <NUM> includes two gas flow path connecting portions <NUM> and <NUM> penetrating through the cylinder <NUM> up and down. The two gas flow path connecting parts <NUM> and <NUM> connects a lower gas flow path (see <NUM> in <FIG>) of a lower gas moving part <NUM>-<NUM> to be described later and an upper second gas flow path (see <NUM> in <FIG>) of an upper gas moving part <NUM>-<NUM>. The gas discharged to the lower gas flow path <NUM> of the lower portion of the cylinder <NUM> moves through the gas flow path <NUM> and passes through the first and second gas flow path connecting parts <NUM> and <NUM>, and is then discharged to the outside through the upper second gas flow path <NUM> of the upper portion of the cylinder <NUM>.

The roller <NUM> is disposed in the compression space CS of the cylinder <NUM> while being fixed to one end of the rotating shaft <NUM>. The roller <NUM> has a cylindrical shape having a diameter smaller than that of the cylindrical compression space CS, and rotates within the compression space CS according to the rotation of the rotating shaft <NUM> by the rotor <NUM> of the motor <NUM>. At this time, the roller <NUM> does not rotate concentrically with the compression space CS, but is provided so that the roller <NUM> is deflected from the center of the compression space CS, and the roller <NUM> rotates while the outer wall of the roller <NUM> keeps close to the inner wall of the compression space CS.

The vane <NUM> are installed to protrude elastically by the spring <NUM> from the inner wall of the compression space CS toward the outer wall of the roller <NUM> in a plate shape, or to compress and move the spring <NUM> in the opposite direction. As a result, the vane <NUM> always keeps elastically pressed against and contacted with the outer wall of the roller <NUM> while the roller <NUM> rotates by the spring <NUM>. In the compression space CS, a gas suction port <NUM> is located on one side, and a gas discharge channel <NUM> is located on the opposite side, based on the vane <NUM>. Therefore, the gas sucked in the gas suction port <NUM> in the cylinder <NUM> is compressed according to the rotation of the roller <NUM>, and is then discharged through upper and lower gas discharge ports (see <NUM> and <NUM> in <FIG>) of the upper and lower flanges <NUM> and <NUM>.

Hereinafter, a process of sucking, compressing, and discharging gas in the cylinder <NUM> will be described with reference to <FIG>.

<FIG> illustrates the state in which the gas is completely sucked into the compression space CS of the cylinder <NUM> through the gas suction port <NUM> and the compressed gas is discharged while the roller <NUM> is located in the gas discharge channel <NUM> on the left side based on the vane <NUM>.

<FIG> illustrates a state in which the roller <NUM> blocks the gas suction port <NUM> while the roller <NUM> rotates right along the inner wall of the cylinder <NUM>.

<FIG> illustrates that the gas already sucked into the cylinder <NUM> is compressed and at the same time a new gas is sucked through the gas suction port <NUM> while the roller <NUM> rotates right along the inner wall of the cylinder <NUM>.

Thereafter, when the roller <NUM> continues to rotate right, the compressed gas as illustrated in <FIG> is discharged through the upper and lower gas discharge ports <NUM> and <NUM> of the upper and lower flanges <NUM> and <NUM> that communicate with the upper and lower portions of the gas discharge channel <NUM>.

<FIG> is a cross-sectional view of the compression part <NUM> and the gas moving part <NUM> in the compressor according to the embodiment of the invention illustrated in <FIG>, <FIG> is a perspective view illustrating a bottom surface of the lower flange <NUM> in the compressor <NUM> according to the embodiment of the invention illustrated in <FIG>, and <FIG> is a perspective view of a top surface of the upper flange <NUM> in the compressor <NUM> according to the embodiment of the invention illustrated in <FIG>.

As illustrated in <FIG>, the gas moving part <NUM> includes the upper gas moving part <NUM>-<NUM> and the lower gas moving part <NUM>-<NUM>. The upper gas moving part <NUM>-<NUM> includes the upper flange <NUM> coupled to the upper portion of the cylinder <NUM> and an upper muffler <NUM> coupled to a top surface portion <NUM> of the upper flange <NUM>. The lower gas moving part <NUM>-<NUM> includes the lower flange <NUM> coupled to the lower portion of the cylinder <NUM> and a lower muffler <NUM> coupled to a bottom surface portion <NUM> of the lower flange <NUM>.

The upper flange <NUM> includes the upper gas discharge port <NUM> that penetrates through the cylinder <NUM> and is formed at a position corresponding to the gas discharge channel <NUM> of the cylinder <NUM>, an upper discharge valve <NUM> that is provided in the upper gas discharge port <NUM> and is opened and closed according to the pressure, and first and second connection outlets <NUM> and <NUM> that are provided to communicate with first and second gas flow path connecting parts <NUM> and <NUM> of the cylinder <NUM>, respectively.

The lower flange <NUM> includes the lower gas discharge port <NUM> that penetrates through the cylinder <NUM> and is formed at a position corresponding to the gas discharge channel <NUM> of the cylinder <NUM>, a lower discharge valve <NUM> that is provided in the lower gas discharge port <NUM> and is opened and closed according to the pressure, and first and second connection outlets <NUM> and <NUM> that are provided to communicate with first and second gas flow path connecting parts <NUM> and <NUM> of the cylinder <NUM>, respectively.

In the upper muffler <NUM>, the gas compressed in the cylinder <NUM> is discharged to the gas discharge port <NUM> of the upper flange <NUM> to pass through the upper first gas flow path <NUM>, and the gas discharged to the first and second connection outlets <NUM> and <NUM> of the upper flange <NUM> passes through the upper second gas flow path <NUM>, thereby reducing noise. The upper muffler <NUM> includes first to fifth expansion space parts <NUM>-<NUM> to <NUM>-<NUM> radially extending around a rotating shaft hole <NUM> as illustrated in <FIG> and <FIG>. The upper muffler <NUM> includes a narrow connecting passage provided between first and second expansion space parts <NUM>-<NUM> and <NUM>-<NUM>, between second and third expansion space parts <NUM>-<NUM> and <NUM>-<NUM>, and fourth and fifth expansion space parts <NUM>-<NUM> and <NUM>-<NUM>. However, the first and fifth expansion space parts <NUM>-<NUM> and <NUM>-<NUM>, and the third and fourth expansion space parts <NUM>-<NUM> and <NUM>-<NUM> may be shielded from each other. Obviously, each of the first to fifth expansion space parts <NUM>-<NUM> to <NUM>-<NUM> may all communicate with each other as needed. The first expansion space part <NUM>-<NUM> is provided corresponding to the position of the gas discharge port <NUM> of the upper flange <NUM>. The second expansion space part <NUM>-<NUM> is provided corresponding to the position of the first muffler outlet <NUM>. The third expansion space part <NUM>-<NUM> is provided corresponding to the position of the first connection outlet <NUM> of the upper flange <NUM>. The fourth expansion space part <NUM>-<NUM> is provided corresponding to the position of the second connection outlet <NUM> of the upper flange <NUM>. The fifth expansion space part <NUM>-<NUM> is provided corresponding to the position of the second muffler outlet <NUM>.

The lower muffler <NUM> reduces noise by discharging the gas compressed in the cylinder <NUM> to the gas discharge port <NUM> of the lower flange <NUM> and passing the gas through the lower gas flow path <NUM>. The lower muffler <NUM> includes first to third expansion space parts <NUM>-<NUM> to <NUM>-<NUM> radially extending around a rotating shaft hole <NUM> as illustrated in <FIG> and <FIG>. The first and second expansion space parts <NUM>-<NUM> and <NUM>-<NUM> may be connected to each other with a narrow width. The first and third expansion space parts <NUM>-<NUM> and <NUM>-<NUM> may be shielded from each other. The first expansion space part <NUM>-<NUM> is provided corresponding to the position of the gas discharge port <NUM> of the lower flange <NUM>. The second expansion space part <NUM>-<NUM> is provided corresponding to the position of the first connection inlet <NUM> of the lower flange <NUM>. The third expansion space part <NUM>-<NUM> is provided corresponding to the position of the second connection inlet <NUM> of the lower flange <NUM>.

The upper gas moving part <NUM>-<NUM> includes the upper first gas flow path <NUM> and the upper second gas flow path <NUM> formed between the top surface portion (<NUM> in <FIG>) of the upper flange <NUM> and the inner surface portion (<NUM> in <FIG>) of the upper muffler <NUM>.

As illustrated in <FIG> and <FIG>, the upper first gas flow path <NUM> and the upper second gas flow path <NUM> are spaced that are set by the top surface portion <NUM> of the upper flange <NUM> and the inner surface portion <NUM> of the upper muffler <NUM> and have a path in which gas rotates around the rotating shaft <NUM> along the flow path by the corresponding space. The upper first gas flow path <NUM> extends from the gas discharge port <NUM> of the upper flange <NUM> to the first muffler outlet <NUM> of the upper muffler <NUM>. The upper first gas flow path <NUM> is set by the shape of the inner surface portion <NUM> of the upper muffler <NUM> because the top surface portion <NUM> of the upper flange <NUM> is flat. The second gas flow path <NUM> has two paths <NUM>-<NUM> and <NUM>-<NUM> that extend from the first and second connection outlets <NUM> and <NUM> connected to the lower gas flow path <NUM> of the lower gas moving part <NUM>-<NUM> to the first muffler outlet <NUM> and the second muffler outlet <NUM>, respectively. That is, in the first muffler outlet <NUM>, the gas discharged from the gas discharge port <NUM> of the upper flange <NUM> is not only discharged through the upper first gas flow path <NUM>, but the gas discharged from the first connection outlet <NUM> is also discharged via the first path <NUM>-<NUM> of the second gas flow path <NUM>. On the other hand, in the second muffler outlet <NUM>, the gas discharged from the second connection outlet <NUM> is discharged via the second path <NUM>-<NUM>.

The low gas moving part <NUM>-<NUM> includes the lower gas flow path <NUM> formed between the bottom surface portion (<NUM> in <FIG>) of the lower flange <NUM> and the inner surface portion (<NUM> in <FIG>) of the lower muffler <NUM>.

As illustrated in <FIG>, <FIG>, <FIG> and <FIG>, the lower gas flow path <NUM> is a space set by the bottom surface portion <NUM> of the lower flange <NUM> and the inner surface portion of the lower muffler <NUM>, and has a path that rotates around the rotating shaft <NUM>. The lower gas flow path <NUM> extends from the gas discharge port <NUM> of the lower flange <NUM> toward the first and second connection inlets <NUM> and <NUM> of the lower flange <NUM>. The lower gas flow path <NUM> is set by the shape of the inner surface portion <NUM> of the lower muffler <NUM> because the bottom surface portion <NUM> of the lower flange <NUM> is flat.

As illustrated in <FIG>, the bottom surface portion <NUM> of the lower flange <NUM> is provided with first and second noise reduction resonators <NUM> and <NUM> between the gas discharge port <NUM> and the first connection inlet <NUM> of the lower flange <NUM>. The first and second noise reduction resonators <NUM> and <NUM> communicate with the lower gas flow path <NUM> and have the resonance space depressed upward in the moving direction of the gas. The second noise reduction resonator <NUM> may be disposed adjacent to or spaced apart from the first noise reduction resonator <NUM>. Further, the lower gas flow path <NUM> may be provided with only the first noise reduction resonator <NUM>, or three or more noise reduction resonators of the same or different shapes may be provided.

<FIG> is a bottom view illustrating the bottom surface of the compression part in the compressor according to the embodiment of the invention, and <FIG> and <FIG> are cross-sectional views taken along lines B-B and C-C of <FIG>.

As illustrated in <FIG>, the first noise reduction resonator <NUM> includes a truncated cone-shaped inlet part <NUM> that gradually narrows inward from the bottom surface portion <NUM> of the lower flange <NUM>, a cylindrical neck part <NUM> that extends upward to a diameter smaller than or equal to a rear end diameter of the inlet part <NUM>, and a cylindrical chamber <NUM> that has a diameter larger than that of the neck part <NUM> and extends to an upper end of the lower flange <NUM> The upper end of the cylindrical chamber <NUM> is shielded by a lower end of the cylinder <NUM>.

The gas discharged from the compression part <NUM> of the compressor <NUM> is introduced into the chamber <NUM> through the inlet part <NUM> and the neck part <NUM> while passing through the lower gas flow path <NUM>. The introduced gas resonates at a resonance frequency (target frequency) of the neck part <NUM> and the chamber <NUM>, and the noise component of the corresponding frequency is converted into thermal energy, thereby reducing the size.

In particular, since the first noise reduction resonator <NUM> according to the invention is depressed upward in the moving direction of gas, foreign objects or liquids may not remain in the chamber <NUM>.

As illustrated in <FIG>, the second noise reduction resonator <NUM> includes a truncated cone-shaped inlet part <NUM> that gradually narrows upward from the bottom surface portion of the lower flange <NUM>, a cylindrical neck part <NUM> that extends upward to the upper end of the lower flange <NUM> with a diameter narrower than or equal to a rear end diameter of the inlet part <NUM>, and a cylindrical chamber <NUM> whose diameter is larger than the neck part <NUM> from the lower end of the cylinder <NUM> to the upper portion.

The gas discharged from the compression part <NUM> of the compressor <NUM> is introduced into the chamber <NUM> through the inlet part <NUM> and the neck part <NUM> after passing through the first noise reduction resonator <NUM> while passing through the lower gas flow path <NUM>. The introduced gas resonates at a resonance frequency (target frequency) of the neck part and the chamber, and the noise component of the corresponding frequency is converted into thermal energy, thereby reducing the size. At this time, the second noise reduction resonator <NUM> is formed up to the cylinder <NUM> deeper than the first noise reduction resonator <NUM> to resonate noise of a frequency different from the frequency reduced by the first noise reduction resonator <NUM>.

Similarly, since the noise reduction resonator <NUM> according to the invention is depressed upward in the moving direction of gas, foreign objects or liquids may not remain in the chamber <NUM>.

<FIG> is a cross-sectional view illustrating the upper muffler <NUM> in the compressor according to the embodiment of the invention. The upper muffler <NUM> has a third noise reduction resonator <NUM> formed on the inner surface thereof to reduce noise of gas passing through the upper first gas flow path <NUM> or the upper second gas flow path <NUM>. The third noise reduction resonator <NUM> communicates with the upper first gas flow path <NUM> or the upper second gas flow path <NUM> and has the resonance space depressed upward in the moving direction of the gas. The compressor <NUM> may include only the third noise reduction resonator <NUM> without the first and second noise reduction resonators <NUM> and <NUM>. The compressor <NUM> may further include the third noise reduction resonator <NUM> together with the first and second noise reduction resonators <NUM> and <NUM> of <FIG>. Alternatively, the compressor <NUM> may further include the third noise reduction resonator <NUM> together with either the first or second noise reduction resonator <NUM> and <NUM> of <FIG>. Two or more noise reduction resonators having the same shape or different shapes may be provided in the upper muffler <NUM> of the compressor <NUM>.

As illustrated, the third noise reduction resonator <NUM> includes a truncated cone-shaped inlet part <NUM> that gradually narrows upward from the inner surface portion <NUM>, a cylindrical neck part <NUM> that extends upward with a diameter smaller than or equal to the rear end diameter of the inlet part <NUM>, and a cylindrical chamber <NUM> whose diameter is larger than that of the neck part <NUM>.

<FIG> is a cross-sectional view illustrating a cross section of the upper flange <NUM> in the compressor <NUM> according to the embodiment of the invention. As illustrated, the upper flange <NUM> has a fourth noise reduction resonator <NUM> to reduce noise of gas passing through the upper first gas flow path <NUM> or the upper second gas flow path <NUM>. The fourth noise reduction resonator <NUM> communicates with the upper first gas flow path <NUM> or the upper second gas flow path <NUM> and has the resonance space depressed upward in the moving direction of the gas. The compressor <NUM> may further include a fourth noise reduction resonator <NUM> together with at least one of the first and second noise reduction resonators <NUM> and <NUM> of <FIG> and the third noise reduction resonator <NUM> of <FIG>. In the compressor <NUM>, two or more noise reduction resonators having the same shape or different shapes may be provided on the upper flange <NUM>.

As illustrated, the fourth noise reduction resonator <NUM> includes a truncated cone-shaped inlet part <NUM> that gradually narrows downward from the top surface portion <NUM>, a cylindrical neck part <NUM> that extends upward with a diameter smaller than or equal to the rear end diameter of the inlet part <NUM>, and a cylindrical chamber <NUM> that has a diameter larger than that of the neck part <NUM> and extends to the lower end of the upper flange <NUM>. The lower end of the cylindrical chamber <NUM> is shielded by the upper end of the cylinder <NUM>.

<FIG> is a bottom view illustrating the bottom surface of the lower flange <NUM> in the compressor <NUM> according to the embodiment of the invention. As illustrated, the first or second noise reduction resonator <NUM> or <NUM> is located within a predetermined angle θ, for example, <NUM>° from the gas discharge port <NUM> of the lower flange <NUM> around the rotating shaft <NUM>, which is effective for noise reduction.

<FIG> are diagrams illustrating the shape of the noise reduction resonator according to the first to third embodiments of the invention. The shape of the noise reduction resonator according to the first to third embodiments may be applied to the first to fourth noise reduction resonators <NUM>, <NUM>, <NUM>, and <NUM> according to the invention.

As illustrated in <FIG>, the noise reduction resonator <NUM> of the first to includes a truncated cone-shaped inlet part <NUM> that gradually narrows, a cylindrical neck part <NUM> that extends upward with a diameter smaller than or equal to the rear end diameter of the inlet part <NUM>, and a cylindrical chamber <NUM> whose diameter is larger than that of the neck part <NUM>.

In <FIG>, the inlet part <NUM> has an inclined portion inclined at a predetermined angle β with respect to a vertical axis of a traveling direction GP of gas. At this time, the inclined inlet part <NUM> may reduce noise generated when gas traveling along the gas flow paths <NUM>, <NUM>, and <NUM> is introduced into the noise reduction resonator <NUM>.

In <FIG>, when the chamber <NUM> and the neck part <NUM> may each have a cylindrical shape that has a first diameter dc and a second diameter dn, the second diameter dn may be set to be <NUM> to <NUM>% relative to the first diameter dc in consideration of the noise reduction. When the inlet part <NUM> has a truncated cone shape that decreases from a maximum diameter demax to a minimum diameter demin in consideration of the noise reduction, the maximum diameter demax may be designed to be larger than the first diameter dc.

In <FIG>, the inlet part <NUM> is a first inclined portion <NUM>-<NUM> inclined at a first angle β1 and a second inclined portion <NUM>-<NUM> inclined at a second angle β2 with respect to the vertical axis of the traveling direction GP of gas. In this case, the first angle β1 should be smaller than the second angle β2. In this way, the inclined inlet part <NUM> may reduce noise generated when gas traveling along the gas flow paths <NUM>, <NUM>, and <NUM> is introduced into the noise reduction resonator <NUM>. Obviously, the inlet part <NUM> may include three or more inclined portions.

In <FIG>, the inlet part <NUM> has an inclined portion inclined at a predetermined curvature R with respect to the vertical axis of the traveling direction GP of gas. In this way, the inlet part <NUM> inclined with a curvature may reduce noise generated when the gas traveling along the gas flow paths <NUM>, <NUM>, and <NUM> is introduced into the noise reduction resonator <NUM>. Obviously, the inlet part <NUM> may include multi-stage curvature inclined portions having two or more different curvatures.

<FIG> is a frequency waveform illustrating a comparison of noise measurement results of the compressor to which the noise reduction resonator according to the embodiment of the invention is applied and the compressor to which the noise reduction resonator is not applied.

As illustrated in <FIG>, as a result of the evaluation by applying the noise reduction resonator <NUM> having a target frequency of <NUM> to the compressor <NUM> according to the invention, the efficiency of the compressor <NUM> is the same, but the overall noise is reduced from <NUM> dB to <NUM> dB, thereby obtaining the reduction effect of about <NUM> dB.

Claim 1:
A compressor (<NUM>), comprising:
a compression part (<NUM>) comprising a compression space (CS) in which introduced gas is accommodated, and configured to compress and discharge the gas in the compression space (CS); and
a first gas moving part (<NUM>, <NUM>-<NUM>) comprising a lower flange (<NUM>) coupled to the compression part (<NUM>) and a first gas flow path (<NUM>) through which the gas discharged from the compression space (CS) moves,
wherein the first gas moving part (<NUM>, <NUM>-<NUM>) at the lower flange (<NUM>) thereof is provided with a first resonator (<NUM>) comprising a resonance space depressed upward with respect to a moving direction of the gas in the first gas flow path (<NUM>);
the compressor being characterised in that the first resonator (<NUM>) further comprises
an inlet part (<NUM>) configured to communicate with the first gas flow path (<NUM>);
a neck part (<NUM>) configured to extend from the inlet part (<NUM>); and
a chamber (<NUM>) configured to extend from the neck part (<NUM>) and comprising a larger diameter than the neck part (<NUM>), and
wherein the inlet part (<NUM>) comprises an inclined portion configured to be inclined with respect to a vertical axis of the moving direction of the gas to narrow toward the neck part (<NUM>).