Patent Publication Number: US-2022235759-A1

Title: Reciprocating compressor

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS 
     The present application claims priority under 35 U.S.C. 119 and 35 U.S.C. 365 to Korean Patent Application No. 10-2021-0009619, filed on Jan. 22, 2021, which is hereby incorporated by reference in its entirety. 
     TECHNICAL FIELD 
     The present disclosure relates to a reciprocating compressor. 
     BACKGROUND 
     A reciprocating compressor is an apparatus that can compress a fluid in a manner of suctioning, compressing, and discharging refrigerant, as a piston reciprocates in a cylinder. The reciprocating compressor may be classified into a connection type reciprocating compressor and a vibration type reciprocating compressor depending on driving manners of a piston. For example, the connection type reciprocating compressor may compress refrigerant by reciprocation of a piston that is connected with a rotating shaft of a driving unit through a connecting rod. The vibration type reciprocating compressor may compress refrigerant by reciprocation of a piston that is connected with a mover of a reciprocating motor configured to vibrate. 
     In some cases, the connection type reciprocating compressor may include a housing shell having an enclosed space, a driving unit provided in the housing shell to provide driving force, a compressing unit connected with a rotating shaft of the driving unit to compress a refrigerant through a reciprocating motion of the piston in the cylinder using the driving force received from the driving unit, and a suction and discharge unit to suction the refrigerant and to discharge the refrigerant compressed through the reciprocating motion of the compressing unit. 
     The suction and discharge unit may include a valve assembly for opening or closing the suction space and the discharge space for the refrigerant, and a suction muffler and a discharge muffler that may reduce noise caused in the procedure of opening or closing the valve assembly. 
     In some cases, the reciprocating compressor may generate noise in a specific band, particularly, in a cavity resonant frequency band of the refrigerant. For example, the cavity may be defined inside the housing shell of the compressor. 
     In some cases, without a unit for reducing the noise generated in the specific band, overall noise of electric appliances, including the reciprocating compressor, may increase. 
     In some cases, the reciprocating compressor may be applied to a small-sized home appliance such as a water purifier. The noise caused by the small-sized home appliance may degrade reliability for the product. 
     SUMMARY 
     The present application describes a reciprocating compressor including a muffler assembly having a resonance chamber. 
     The present application also describes a reciprocating compressor including a suction muffler having an inner space divided into two spaces to reduce noise. 
     The present application also describes a reciprocating compressor including a partition wall installed in a suction muffler to divide an inner space into a resonance chamber and a cavity chamber, where the partition wall is stably supported on an inner surface of the suction muffler. 
     The present application also describes a reciprocating compressor including a guide pipe that communicates with a suction hole of a suction muffler and that is disposed at a partition wall to guide a refrigerant from a first space to a second space in the suction muffler. 
     The present application also describes a reciprocating compressor including a suction pipe portion that extends from a suction hole to a guide pipe and that is configured to transfer a refrigerant suctioned through the suction hole to the guide pipe. 
     The present application also describes a reciprocating compressor having a support structure for a guide pipe and a suction pipe portion to facilitate an assembly of the guide pipe and the suction pipe portion and to allow the guide pipe to be stably supported on a suction pipe portion during suction of a refrigerant. 
     The present application also describes a reciprocating compressor including a protrusion that is disposed on a partition wall to allow a guide pipe to be stably supported on a suction muffler. 
     The present application also describes a reciprocating compressor having a through-hole (resonance hole) that is defined in a guide pipe to reduce noise generated in the compressor. 
     According to one aspect of the subjected matter described in this application, a reciprocating compressor includes a partition wall that partitions an inside of a suction muffler into two spaces and a guide pipe that is provided in the partition wall and that defines a resonance hole to reduce noise in a specific band. For example, the reciprocating compressor can be installed in a small-sized product such as a water purifier, and the specific band can range of about 800 Hz to about 1 kHz. The two spaces can include a resonance chamber that is defined close to a suction hole of the suction muffler and a cavity chamber defined at an opposite side of the resonance chamber with respect to the partition wall. 
     The guide pipe can include a first part disposed in the resonance chamber and a second part disposed in the cavity chamber. 
     The guide pipe can include a through-hole defined as a resonance hole. 
     For example, the through-hole can be defined in the first part. 
     A protrusion can be disposed on the partition wall to allow the guide pipe to be stably supported on an inner surface of the suction muffler. For example, the protrusion can be supported on a support jaw provided on the inner surface of the suction muffler. 
     The suction muffler can include first and second muffler portions assembled together. The protrusion can be pressed by the first muffler, the partition wall can be stably supported. 
     The guide pipe can be supported by the suction pipe portion of the suction muffler and include a first end for introducing a refrigerant and a second end for discharging the refrigerant. Since the first end is seated on or inserted into the suction pipe, the guide pipe can be stably supported on the suction muffler. 
     According to one aspect of the subject matter described in this application, a reciprocating compressor includes a cylinder and a suction muffler that is configured to receive refrigerant and to supply the refrigerant to the cylinder. The suction muffler includes a suction muffler body that defines a suction space configured to receive the refrigerant, a partition wall that is disposed at the suction muffler body and partitions the suction space into a first space and a second space, and a guide pipe that is disposed at the partition wall and defines a refrigerant passage in fluid communication with the first and second spaces. The guide pipe includes (i) a first pipe portion that extends from the partition wall to the first space and defines a resonance hole and (ii) a second pipe portion that extends from the partition wall to the second space. 
     Implementations according to this aspect can include one or more of the following features. For example, the suction muffler body can define a suction hole configured to receive the refrigerant into the suction muffler, and the suction muffler can further include a suction pipe portion that is disposed inside the suction muffler body and that extends from the suction hole, where the suction pipe portion is in fluid communication with the first pipe portion. In some examples, the suction hole can be defined at an outer surface of the suction muffler body, and the suction pipe portion can extend from the suction hole to a central portion of the suction muffler body. 
     In some implementations, the suction pipe portion can include (i) a pipe discharge portion configured to discharge the refrigerant in the suction pipe portion to the guide pipe and (ii) a support stepwise portion that protrudes inward from an inner circumferential surface of the pipe discharge portion and supports an end of the first pipe portion. 
     In some implementations, the guide pipe can extend from the first space to the second space in a direction crossing the partition wall. In some examples, the guide pipe can extend from the first space to the second space through the partition wall. In some examples, the first pipe portion can have a first end configured to introduce the refrigerant in the first space into the guide pipe, and the second pipe portion can have a second end configured to discharge the refrigerant to the second space. In some examples, a length of the second pipe portion can be greater than a length of the first pipe portion. 
     In some implementations, the partition wall can include a partition wall plate connected to the guide pipe and a protrusion that protrudes from the partition wall plate and is in contact with an inner surface of the suction muffler body, where the suction muffler body includes a support jaw that supports the partition wall plate. In some examples, the suction muffler body can include a first suction muffler body and a second suction muffler body, where the partition wall plate is disposed within the second suction muffler body. In some examples, an inner surface of the second suction muffler body supports the protrusion of the partition wall, and an end of the first suction muffler body is configured to apply pressure to the protrusion of the partition wall. 
     In some implementations, the first suction muffler body can include a flange and an inner wall that are spaced apart from each other to thereby define an insertion space therebetween, where the insertion space receives an end of the second suction muffler body. In some examples, the inner wall of the first suction muffler body can be configured to apply pressure to the protrusion of the partition wall. In some examples, the first space includes a resonance chamber, and the second space includes a cavity chamber, where the resonance chamber and the cavity chamber are configured to reduce noise generated in the reciprocating compressor. 
     In some implementations, the reciprocating compressor includes a tank disposed between the cylinder and the suction muffler and configured to receive the refrigerant from the suction muffler and to discharge the refrigerant to the cylinder, and a discharge muffler disposed at a side of the tank and configured to receive the refrigerant compressed in the cylinder and to discharge the refrigerant to an outside of the discharge muffler. In some examples, the tank is disposed between the suction muffler and the discharge muffler and connects the suction muffler and the discharge muffler to each other. 
     In some implementations, the refrigerant passage can extend from a first end of the first pipe portion facing away from the tank to a second end of the second pipe portion facing the tank, where a distance between the partition wall and the first end of the first pipe portion is less than a distance between the partition wall and the second end of the second pipe portion. 
     In some implementations, the partition wall can be disposed inside the suction muffler body. In some examples, the refrigerant passage can extend from a first end hole defined at the first pipe portion to a second end hole defined at the second pipe portion, where each of the resonance hole and the first end hole is configured to supply the refrigerant in the first space to the second space through the refrigerant passage. 
     In some implementations, the resonance hole can pass through a circumferential surface of the first pipe portion and be in fluid communication with the refrigerant passage inside the first pipe portion. 
     The details of one or more implementations are set forth in the accompanying drawings and the description below. Other features will be apparent from the description and drawings, and from the claims. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  is a perspective view illustrating an example of a reciprocating compressor. 
         FIG. 2  is a cross-sectional view taken along line  2 - 2 ′ of  FIG. 1 . 
         FIG. 3  is a perspective view illustrating an example of a muffler assembly. 
         FIG. 4  is a front exploded perspective view illustrating the muffler assembly. 
         FIG. 5  is a rear exploded perspective view illustrating the muffler assembly. 
         FIG. 6  is a view illustrating an example of a suction and discharge tank coupled to first and third muffler portions. 
         FIG. 7  is a view illustrating an example of a second suction muffler portion. 
         FIG. 8  is an upper perspective view illustrating an example of a suction guide device. 
         FIG. 9  is a lower perspective view illustrating the suction guide device. 
         FIG. 10  is a plan view illustrating an example of a suction and discharge tank coupled to first and third muffler portions. 
         FIG. 11  is a cross-sectional view taken along line  11 - 11 ′ of  FIG. 10 . 
         FIG. 12  is a cross-sectional view taken along line  12 - 12 ′ of  FIG. 10 . 
         FIG. 13  is a view illustrating an example flow of refrigerant suctioned in a suction muffler. 
         FIGS. 14A and 14B  are experimental graphs illustrating a noise reduction effect in the suction muffler provided with the suction guide device. 
     
    
    
     DETAILED DESCRIPTION 
     Hereinafter, exemplary implementations of the present disclosure will be described in detail with reference to accompanying drawings, such that those skilled in the art can more apparently understand the present disclosure. It should be understood that the exemplary implementations herein are provided only for the illustrative purpose, and various modifications of the implementations are reproduced. In addition, the shapes and the sizes of elements in accompanying drawings may be exaggerated for more apparent description. 
       FIG. 1  is a perspective view illustrating an example of a reciprocating compressor, and  FIG. 2  is a cross-sectional view taken along line  2 - 2 ′ of  FIG. 1 . 
     Referring to  FIGS. 1 and 2 , a reciprocating compressor  1  can include a shell  10  that defines an outer appearance of the reciprocating compressor  1 . An enclosed space can be defined inside the shell  10 , and various components of the reciprocating compressor  1  can be received in the enclosed space. The shell  10  can be made of a metallic material. 
     A cavity can be formed in an inner space of the shell  10  to define the resonance frequency of the refrigerant. In some implementations, a structure of reducing noise caused in a cavity resonance frequency band of the refrigerant can be provided. 
     In some implementations, the shell  10  can include a lower shell  11  and an upper shell  16  provided at an upper side of the lower shell  11 . For example, the lower shell  11  can have a substantially hemispherical shape and define a receiving space to receive various components, for example, such as a driving unit  20 , a compressing unit  30 , and a suction and discharge unit  100 , together with the upper shell  16 . In some examples, the lower shell  11  can be referred to as a “compressor body” and the upper shell  16  can be referred to as a “compressor cover.” 
     The lower shell  11  includes a suction pipe  12 , a discharge pipe  13 , a process pipe  14 , and a power supply. The suction pipe  12  is used to introduce a refrigerant into the shell  10 , and is mounted through the lower shell  11 . The suction pipe  12  can be mounted separately from the lower shell  11  or can be integrally formed with the lower shell  11 . 
     The discharge pipe  13  is used to discharge the refrigerant, which is compressed in the shell  10 , and is mounted through the lower shell  11 . The discharge pipe  13  can be separately mounted separately from the lower shell  11  or can be integrally formed with the lower shell  11 . 
     A discharge hose  60  (see  FIG. 3 ) is connected with the discharge pipe  13 . The refrigerant, which is introduced into the suction pipe  12  and compressed by the compressing unit  30 , can be discharged to the discharge pipe  13  through the suction and discharge unit  100  and the discharge hose  60 . 
     The process pipe  14 , which is a device provided to fill the refrigerant into the shell  10  after the inner portion of the shell  10  is sealed, can be mounted through the lower shell  11 . 
     The driving unit  20  is provided in the inner space of the shell  10  to provide driving force. The driving unit  20  can include a stator  21 , a rotor  24 , and a rotating shaft  22 . The stator  21  includes a stator core and a coil coupled to the stator core. The driving unit  20  can be a driver such as an electric motor. 
     When power is applied to the coil, the coil generates electromagnetic force to perform electromagnetic interaction with the stator core and the rotor. Accordingly, the driving unit  20  can generate driving force for a reciprocating motion of the compressing unit  30 . 
     The rotor  24  has a magnet, and is rotatably provided inside the coil. The rotational force resulting from the rotation of the rotor  24  acts as driving force for driving the compressing unit  20 . 
     The rotating shaft  22  can rotate together with the rotor  24 , and can be mounted through an inner portion of the rotor  24  in a vertical direction. In addition, the rotating shaft  22  is connected to a connecting rod  34  to transmit the rotational force generated by the rotor  24  to the compressing unit  30 . 
     In detail, the rotating shaft  22  can include a base shaft  22   a , a rotational plate  22   b , and an eccentric shaft  22   c.    
     The base shaft  22   a  is mounted inside the rotor  24  in the vertical direction. When the rotor  24  rotates, the base shaft  22   a  can be rotated together with the rotor  24 . The rotational plate  22   b  can be installed on one side of the base shaft  22   a , and can be rotatably mounted to a cylinder block  31  to be described later. 
     The eccentric shaft  22   c  protrudes upward from a position eccentric from the axial center of the base shaft  22   a  to eccentrically rotate when the rotational plate  22   b  rotates. A connecting rod  34  is mounted on the eccentric shaft  22   c . As the eccentric shaft  22   c  eccentrically rotates, the connecting rod  34  can linearly reciprocate in a front-rear direction. 
     The compressing unit  30  receives the driving force from the driving unit  20  to compress the refrigerant through linear reciprocation motion. The compressing unit  30  can include a cylinder block  31 , a connecting rod  34 , a piston  35 , and a piston pin  37 . 
     The cylinder block  31  is provided above the rotor  24 . In addition, the cylinder block  31  has a shaft opening such that the rotating shaft  22  passes through the shaft opening. A lower portion of the cylinder block  31  can rotatably support the rotational plate  22   b.    
     The cylinder  33  is provided at a front portion of the cylinder block  31  and arranged to receive the piston  35 . The piston  35  reciprocates in the front-rear direction, and a compressing space C for compressing the refrigerant is formed inside the cylinder  33 . 
     The connecting rod  34  is a device for transmitting the driving force, which is provided from the driving unit  20 , to the piston  35 , and converts the rotational motion of the rotating shaft  22  into the linear reciprocation motion. In detail, the connecting rod  34  linearly reciprocates in the front-rear direction when the rotating shaft  22  rotates. 
     The piston  35  is a device for compressing the refrigerant, and is provided in the cylinder  33 . The piston  35  is connected with the connecting rod  34  and linearly reciprocates in the cylinder  33 , as the connecting rod  34  moves. The refrigerant introduced from the suction pipe  12  can be compressed in the cylinder  33 , as the piston  35  linearly reciprocates. 
     The piston pin  37  couples the piston  35  and the connecting rod  34 . In detail, the piston pin  37  can connect the piston  35  with the connecting rod  34  by passing through the piston  35  and the connecting rod  34  in the vertical direction. 
     The suction and discharge unit  100  is configured to suction the refrigerant to be supplied to the compressing unit  30  and to discharge the compressed refrigerant from the compressing unit  30 . The suction and discharge unit  100  can include a muffler assembly  110  and a discharge hose (or hose assembly)  60 . 
     The muffler assembly  110  transfers the suctioned refrigerant, which is received from the suction pipe  12 , into the cylinder  33 , and transfers the refrigerant, which is compressed in the compressing space C of the cylinder  33 , to the discharge pipe  13 . To this end, the muffler assembly  110  has a suction space S for receiving the suctioned refrigerant from the suction pipe  12  and a discharge space D for receiving the refrigerant compressed in the compressing space C of the cylinder  33 . 
     In detail, the suctioned refrigerant from the suction pipe  12  can be introduced into the suction space S of a suction and discharge tank  120  through suction muffler portions  130  and  140 . The refrigerant compressed in the cylinder  33  passes through discharge muffler portions  150  and  160  through the discharge space D of the suction and discharge tank  120 , and is discharged of the compressor  1  through the discharge hose  60  and the discharge pipe  13 . 
     The discharge hose  60  is a device to transfer the compressed refrigerant, which is contained in the discharge space D, to the discharge pipe  13 , and is integrally formed with a second discharge muffler portion  160  of the discharge muffler portions  150  and  160 . In detail, one portion of the discharge hose  60  can be coupled to the second discharge muffler portion  160  to communicate with the discharge space D, or can be formed integrally with the second discharge muffler portion  160 . 
     An opposite portion of the discharge hose  60  is coupled to the discharge pipe  13  through a connector  65 . The discharge hose  60  and the connector  65  can be jointed to each other or can be formed integrally with each other. 
     The connector  65  has a plurality of grooves, and ring members  66   a  and  66   b  can be installed in the plurality of grooves, respectively. The ring members  66   a  and  66   b  can be formed of rubber or synthetic resin material. 
       FIG. 3  is a perspective view illustrating an example configuration of the muffler assembly,  FIG. 4  is a front exploded perspective view illustrating the muffler assembly, and  FIG. 5  is a rear exploded perspective view illustrating the muffler assembly. 
     Referring to  FIGS. 3 to 5 , the muffler assembly  110  can include a first suction muffler portion  130  and a second suction muffler portion  140  constituting the suction muffler. 
     The first suction muffler portion  130  and the second suction muffler portion  140  can be assembled, and a refrigerant suction space (or a suction fluid passage) can be defined inside the first and second suction muffler portions  130  and  140  through the assembling between the first suction muffler portion  130  and the second suction muffler portion  140 . 
     When viewed based on  FIG. 3 , the first suction muffler portion  130  can be coupled to an upper side of the second suction muffler portion  140 . For example, the first suction muffler portion  130  can include a hook  135 , and the second suction muffler portion  140  can include a hook protrusion  145  coupled to the hook  135 . 
     Unlike the drawings, the hook protrusion can be provided on the first suction muffler portion  130 , and the hook coupled to the hook protrusion can be provided on the second suction muffler portion  140 . 
     The first suction muffler portion  130  can include a first muffler body  131  including a suction guide hole  136 . An end of the first muffler body  131  can be open. 
     A first muffler flange  132  coupled to the second suction muffler portion  140  can be provided on the first muffler body  131 . The first muffler flange  132  can be formed to be stepped from the first muffler body  131  such that an outer diameter of the first muffler flange  132  is greater than an outer diameter of the first muffler body  131 . 
     The first muffler flange  132  can be coupled to an open end of the second discharge muffler portion  160 . For example, the first muffler flange  132  can be coupled to an outer portion of the second discharge muffler portion  160 . 
     The second suction muffler portion  140  can include a second muffler body  141  having a suction hole  142  communicating with the suction pipe  12 . 
     The combination of the first muffler body  131  of the first suction muffler portion  130  and the second muffler body  141  of the second suction muffler portion  140  can be collectively referred to as a “suction muffler body.” 
     The suction hole  142  can be formed through a portion of an outer circumferential surface of the second muffler body  141 . In addition, the suction hole  142  is positioned adjacent to the inside of one point of the lower shell  11  to which the suction pipe  12  is coupled. 
     The second suction muffler portion  140  can include an oil drain portion  148  such that oil separated from the refrigerant in the inner space of the suction muffler portions  130  and  140  is discharged into the inner space of the shell  10 . The oil drain portion  148  can protrude downward from a bottom surface of the second muffler body  141 . 
     The second suction muffler portion  140  can further include a skirt  149  protruding downward from the bottom surface of the second muffler body  141  to prevent the oil discharged from the oil drain portion  148  from scattering. The skirt  149  can be provided adjacent to the oil drain portion  148 . 
     A suction pipe portion  143  (see  FIG. 7 ) is provided in the second suction muffler portion  140 . The suction pipe portion  143  can extend from the suction hole  142  in a central direction of the inside of the second suction muffler portion  140 . The suction pipe portion  143  can be configured as, for example, a pipe having a cylindrical shape. 
     The suction and discharge tank  120  is connected to one side of the first suction muffler portion  130 . For example, the first suction muffler portion  130  and the suction and discharge tank  120  can be integrally formed. 
     The discharge muffler portions  150  and  160  can be provided in opposition to each other based on the suction and discharge tank  120 . 
     In detail, the first discharge muffler portion  150  of the discharge muffler is disposed to be spaced apart from one side of the first suction muffler portion  130 . The suction and discharge tank  120  having the suction space S and the discharge space D are mounted between the first suction muffler portion  130  and the first discharge muffler portion  150 . 
     The first suction muffler portion  130 , the suction and discharge tank  120 , and the first discharge muffler portion  150  can be integrally configured. The first suction muffler portion  130 , the suction and discharge tank  120 , and the first discharge muffler portion  150  can be collectively named a “tank assembly.” 
     The first suction muffler portion  130 , the suction and discharge tank  120 , and the first discharge muffler portion  150  can be formed of the same material, for example, of a nylon material having higher pressure resistance. 
     The suction and discharge tank  120  can include a tank body  121  having a suction and discharge space. For example, the tank body  121  can have a cylindrical shape. 
     A suction chamber  123   a  and a discharge chamber  123   b  can be formed inside the tank body  121 . The suction chamber  123   a  can have the suction space S, and the discharge chamber  123   b  can have the discharge space D. 
     The suction chamber  123   a  and the discharge chamber  123   b  can be formed to be recessed in a surface facing the valve assembly. 
     The suction chamber  123   a  can be configured to communicate with the suction guide hole  136  of the first suction muffler portion  130 . The suction guide hole  136  can be formed in the connection portion between the suction and discharge tank  120  and the first suction muffler portion  130 . For example, the suction guide hole  136  can be formed in one side of an outer circumferential surface of the suction and discharge tank  120 . 
     The discharge chamber  123   b  can be configured to communicate with the discharge guide hole  156  of the first discharge muffler portion  150 . The discharge guide hole  156  can be formed in the connection portion between the suction and discharge tank  120  and the first discharge muffler portion  150 . For example, the discharge guide hole  156  can be formed in an opposite side of an outer circumferential surface of the suction and discharge tank  120 . 
     The suction and discharge tank  120  can include a partition portion  122  to partition the inner space of the suction and discharge tank  120  into the suction chamber  123   a  and the discharge chamber  123   b . The valve assembly can be installed at one side of the suction and discharge tank  120 . The valve assembly can include a suction valve to open and close the suction chamber  123   a  and a discharge valve to open and close the discharge chamber  123   b.    
     A retainer  124  can be provided in the discharge chamber  133   b  to limit the opening amount of the discharge valve. The retainer  124  can protrude from the bottom surface of the discharge chamber  133   b  and be disposed adjacent to the discharge guide hole  156 . 
     The suction and discharge tank  120  can further include a sealing protrusion  125  to which a sealing member is coupled. 
     The second discharge muffler portion  160  of the discharge muffler can be assembled with the first discharge muffler portion  150 , and a discharge space (or a discharge fluid passage) for the refrigerant can be defined inside the first and second discharge muffler portions  150  and  160  through the assembling. 
     When viewed based on  FIG. 3 , the first discharge muffler portion  150  can be coupled to an upper side of the second discharge muffler portion  160 . 
     The first discharge muffler portion  150  can include a first muffler body  151  including a discharge guide hole  156 . An end of the first muffler body  151  can be open. 
     A first muffler flange  152  coupled to the second discharge muffler portion  160  can be provided on the first muffler body  151 . The first muffler flange  152  can be formed to be stepped from the first muffler body  151  such that an outer diameter of the first muffler flange  132  is greater than an outer diameter of the first muffler body  151 . The first muffler flange  152  can be inserted into an open end of the second discharge muffler portion  160 . 
     The second discharge muffler portion  160  can include a second muffler body  161  having a discharge portion  165  coupled to the discharge hose  60 . 
     A second muffler flange  162  coupled to the first discharge muffler portion  150  can be provided on an end of the second muffler body  161 . The second muffler flange  162  can be formed to be stepped from the second muffler body  161  such that an outer diameter of the second muffler flange  162  is greater than an outer diameter of the second muffler body  161 . The second muffler flange  162  can be coupled to an outer portion of the first muffler flange  152 . 
     A discharge guide device  300  for reducing pressure pulsation of the discharged refrigerant can be provided inside the discharge muffler portions  150  and  160 . The discharge guide device  300  can form the discharge fluid passage of the refrigerant, and can be supported by inner surfaces of the discharge muffler portions  150  and  160 . 
     The discharge hose  60  can extend from the second discharge muffler portion  160  and be coupled to the discharge pipe  13 . The discharge hose  60  can be coupled to the discharge portion  165 . 
       FIG. 6  is a view illustrating an example configuration of the suction and discharge tank that is integrated with the first and third muffler portions, and  FIG. 7  is a view illustrating an example configuration of the second suction muffler portion. 
     Referring to  FIGS. 6 and 7 , the muffler assembly  110  can include the suction and discharge tank  120 , the first suction muffler portion  130  provided at one side of the suction and discharge tank  120 , and the first discharge muffler portion  150  provided at an opposite side of the suction and discharge tank  120 . 
     The first suction muffler portion  130  and the first discharge muffler portion  150  can be disposed in opposition to each other based on the suction and discharge tank  120 . 
     The first suction muffler portion  130  can include a first muffler body  131  to form a flowing space, that is, the suction fluid passage for the refrigerant which is suctioned into the muffler assembly  110 . The suction guide hole  136 , which is to suction the refrigerant into the suction and discharge tank  120 , can be formed in the first muffler body  131 . The suction guide hole  136  can be formed in a portion at which the first suction muffler portion  130  is connected with the suction and discharge tank  120 . 
     The first suction muffler portion  130  can further include an inner wall  133  provided inside the first muffler body  131 . The inner wall  133  can extend along an inner circumferential surface of the first muffler body  131  in parallel to the first muffler body  131 . 
     The inner wall  133  can be spaced apart from the inner circumferential surface of the first muffler body  131 . An insertion space  134  can be provided between the first muffler body  131  and the inner wall  133 . An end of the second suction muffler portion  140  can be inserted into the insertion space  134 , such that the first and second suction muffler portions  130  and  140  can be assembled. 
     The first discharge muffler portion  150  can include a first muffler body  151  that forms a flowing space, that is, a discharge fluid passage  150   a  for the refrigerant discharged from the suction and discharge tank  120 . The discharge guide hole  156 , which is to discharge the refrigerant from the suction and discharge tank  120 , can be formed in the first muffler body  151 . The discharge guide hole  156  can be formed in a portion at which the first discharge muffler portion  150  is connected with the suction and discharge tank  120 . 
     The first discharge muffler portion  150  can include at least one wall provided in the discharge fluid passage  150   a  to divide the discharge fluid passage  150   a  into a plurality of discharge rooms. For example, the at least one wall can include a plurality of walls  153 , 154 , and  155 . 
     The plurality of walls  153 ,  154 , and  155  can function as “reinforcing walls” that prevent the discharge muffler portions  150  and  160  from being damaged by the high pressure applied when the discharged refrigerant flows. 
     The plurality of walls  153 ,  154 , and  155  can include a first wall  153 , a second wall  154  spaced apart from one side of the first wall  153 , and a third wall  155  spaced apart from an opposite side of the first wall  153 . 
     The discharge chamber  123   b  of the suction and discharge tank  120  can form a primary discharge room for the refrigerant. 
     A space between the first wall  153  and the second wall  154  or a space between the first wall  153  and the first muffler body  151  can define a secondary discharge room of the refrigerant. 
     A space between the third wall  155  and the first muffler body  151  can define a tertiary discharge room for the refrigerant. 
     A space between the second wall  154  and the third wall  155  can define a quaternary discharge room of the refrigerant. 
     The discharge guide device  300  can be arranged to be positioned in the spaces among the plurality of walls  153 ,  154 , and  155 . A main stream of the refrigerant discharged to the first discharge muffler portion  150  through the discharge guide hole  156  passes through an inner fluid passage of the discharge guide device  300  and is discharged to the outside through the discharge portion  165  of the second discharge muffler portion  160 . 
     In some implementations, a sub-stream of the refrigerant discharged to the first discharge muffler portion  150  through the discharge guide hole  156  can be diffused into the secondary discharge room to the quaternary discharge room. The discharge pulsation of the refrigerant can be reduced by the main stream and the sub-stream of the refrigerant. 
     A second suction muffler portion  140  can be assembled to the first suction muffler portion  130 . The first suction muffler portion  130  and the second suction muffler portion  140  can be coupled to each other by ultrasonic welding. 
     The second suction muffler portion  140  can include a second muffler body  141  that defines a suction space for the refrigerant. An oil drain hole  148   a  through which oil is discharged can be defined in a bottom surface  141   a  of the second muffler body  141 . The oil drain hole  148   a  can be defined at a position corresponding to the oil drain portion  148 . 
     An assembly end  147  inserted into the insertion space  134  of the first suction muffler portion  130  can be disposed on the second muffler body  141 . The assembly end  147  can be disposed on an upper end of the second muffler body  141 . 
     The second suction muffler portion  140  can further include supporting jaws  146   a  and  146   b  to support the first suction muffler portion  130  or the suction guide device  200 . 
     The supporting jaws  146   a  and  146   b  can be disposed to be stepped on an inner circumferential surface of the second muffler body  141 . 
     The supporting jaws  146   a  and  146   b  can include a first supporting jaw  146   a  disposed below the assembly end  147  to support the first suction muffler portion  130 . An end of the first suction muffler portion  130  can be disposed on the first support jaw  146   a.    
     The end of the first suction muffler portion  130  can be placed on the protrusions  215   a  and  215   b  of the suction guide device  200 , and when the first and second suction muffler portions  130  and  140  are assembled, the first suction muffler portion  130  can press upper ends of the protrusions  215   a  and  215   b . Thus, the suction guide device  200  can be stably supported inside the first and second suction muffler portions  130  and  140 . 
     The supporting jaws  146   a  and  146   b  can include a second supporting jaw  146   b  disposed below the first supporting jaw  146   a  to support the suction guide device  200 . 
     The second support jaw  146   b  can be disposed to be further stopped from the first support jaw  146   a  in the inner direction of the second suction muffler portion  140 . A partition wall  210  of the suction guide device  200  can be supported on the second support jaw  146   b.    
     The second suction muffler portion  140  can include the suction hole  142  for introducing the refrigerant and the suction pipe portion  143  extending from the suction hole  142  to the inner space of the second suction muffler portion  140 . 
     The suction pipe portion  143  includes a pipe inflow portion  143   a  having a first end connected to the suction hole  142  and a pipe discharge portion  143   b  having a second end connected to the suction guide device  200 . The pipe inflow portion  143   a  can be disposed on an inner circumferential surface of the second muffler body  141 , and the pipe discharge portion  143   b  can be disposed at a central portion of the inside of the second muffler body  141 . 
     The suction guide device  200  can be supported on the suction pipe portion  143 . A support stepwise portion  144  on which the end of the suction guide device  200  is supported can be provided inside the pipe discharge portion  143   b . The guide pipe  220  of the suction guide device  200  can be supported on the support stepwise portion  144 . 
     The support stepwise portion  144  can protrude from the inner circumferential surface of the suction pipe portion  143  by a predetermined length so that the first end  223  of the first pipe portion  221   a  of the guide pipe  220  is in surface contact with the support stepwise portion  144  and extends in a circumferential direction. Since the end of the first pipe portion  221   a  is seated on the support stepwise portion  144 , the suction guide device  200  can be easily assembled with the second suction muffler portion  140 . 
     Hereinafter, the suction guide device  200  will be described in more detail. 
       FIG. 8  is an upper perspective view illustrating an example configuration of the suction guide device,  FIG. 9  is a lower perspective view illustrating an example configuration of the suction guide device,  FIG. 10  is a plan view illustrating an example configuration of the suction and discharge tank that is integrated with the first and third muffler portions,  FIG. 11  is a cross-sectional view taken along line  11 - 11 ′ of  FIG. 10 , and  FIG. 12  is a cross-sectional view taken along line  12 - 12 ′ of  FIG. 10 . 
     Referring to  FIGS. 8 to 12 , the suction guide device  200  of the present disclosure can be provided inside the suction muffler portions  130  and  140 . A flow space for the refrigerant can be defined in the suction guide device  200 . 
     The suction guide device  200  can include a partition wall  210  that divides the inner space of the suction muffler portions  130  and  140  into two spaces S 1  and S 2  (see  FIG. 13 ). The partition wall  210  can include a partition wall plate  211  as a body portion having a shape corresponding to a cross-section of the inside of each of the suction muffler portions  130  and  140 . 
     The two spaces S 1  and S 2  can include a first space S 1  functioning as a resonance chamber (resonant silencer) and a second space S 2  functioning as a cavity chamber (expandable silencer). 
     The partition wall plate  211  can include a plate body having a thin plate shape. 
     The partition wall plate  211  can include an edge portion  212  that is bent from an outer circumferential surface of the partition wall plate  211  to extend downward. The edge portion  212  can be provided to slightly protrude downward from the plate body of the partition wall plate  211 . 
     The edge portion  212  can be supported on an inner circumferential surface of the second suction muffler portion  140 . For example, the edge portion  212  can be in surface contact with the inner circumferential surface of the second suction muffler portion  140 . The edge portion  212  can be referred to as a “support rib” of the partition wall. 
     A lower end  212   a  of the edge portion  212  can be supported by the second support jaw  146   b  of the second suction muffler portion  140 . That is, an outer circumferential surface of the partition wall plate  211  can be supported by the inner circumferential surface of the second suction muffler portion  140 , and an end of the partition wall plate  211  can be supported by the second support jaw  146   b , and thus, supporting force of the suction guide device  200  with respect to the second suction muffler portion can increase. 
     The partition wall  210  can further include protrusions  215   a  and  215   b  protruding upward from a top surface of the partition wall plate  211 . 
     A plurality of the protrusions  215   a  and  215   b  can be provided, and the plurality of protrusions  215   a  and  215   b  can be provided at both sides of the partition wall plate  211 , respectively. For example, the protrusions  215   a  and  215   b  can include a first protrusion  215   a  provided at one side of the partition wall plate  211  and a second protrusion  215   b  provided at an opposite side of the partition wall plate  211 . 
     The protrusions  215   a  and  215   b  can be supported on an inner circumferential surface of the second suction muffler portion  140 . For example, the protrusions  215   a  and  215   b  can be in surface contact with the inner circumferential surface of the second suction muffler portion  140 . 
     The protrusions  215   a  and  215   b  can be supported on the inner circumferential surface of the second suction muffler portion  140 , which is disposed between the first supporting jaw  146   a  and the second supporting jaw  146   b . That is, the protrusions  215   a  and  215   b  can be disposed upward from the second supporting jaw  146   b  to the first supporting jaw  146   a.    
     Upper ends of the protrusions  215   a  and  215   b  can be pressed by a lower end of the first suction muffler portion  130  when the first and second suction muffler portions  130  and  140  are assembled. For example, the upper ends of the protrusions  215   a  and  215   b  can be disposed at substantially the same height as the first supporting jaw  146   a , and the lower end of the first suction muffler portion  130  can be disposed on the upper ends of the first supporting jaws  146   a  and the protrusions  215   a  and  215   b . Due to this configuration, the first and second suction muffler portions  130  and  140  and the suction guide device  200  can be easily and rigidly assembled. 
     The partition wall  210  can further include a reinforcing rib  214  provided on the partition wall plate  211 . The reinforcing rib  214  can be provided to protrude from the top surface of the partition wall plate  211 . The reinforcing rib  214  can extend from the top surface of the partition wall plate  211  in a direction that is directed from the first protrusion  215   a  to the second protrusion  215   b.    
     The suction guide device  200  can further include a guide pipe  220  connected to the partition wall  210  and defining a flow space for the refrigerant. 
     The guide pipe  220  can extend in a direction crossing the partition wall  210 . 
     For example, the partition wall  210  can extend in a horizontal direction inside the suction muffler portions  130  and  140  to divide the inner space into upper and lower first and second spaces S 1  and S 2 . 
     The guide pipe  220  can extend to passing through the partition wall  210 , and a refrigerant passage P can be defined in the guide pipe  220 . 
     The guide pipe  220  can be provided in a longitudinal direction inside the suction muffler portions  130  and  140  to extend upward and downward from the partition wall  210 . 
     The guide pipe  220  can include a pipe body  221  defining a flow space for the refrigerant therein. The pipe body  221  can include a first pipe portion  221   a  disposed in the first space S 1  and a second pipe portion  221   b  disposed in the second space S 2 . 
     The first pipe portion  221   a  can extend downward from a bottom surface of the partition wall plate  211 , and the second pipe portion  221   b  can extend upward from a top surface of the partition wall plate  211 . 
     The second pipe portion  221   b  can be an element constituting the expandable silencer, and since a length of the second pipe portion  221   b  is capable of affecting performance of the silencer, the length of the second pipe portion  221   b  can be relatively long. Thus, the length of the second pipe portion  221   b  can be longer than that of the first pipe portion  221   a.    
     The guide pipe  220  can extend in the vertical direction and include a first end  223  for introducing the refrigerant suctioned in the suction hole  142  and a second end  224  for discharging the refrigerant passing through the guide pipe  220  to the inner spaces of the suction muffler portions  130  and  140 . 
     For example, the first end  223  can define the lower end of the guide pipe  220 , and the second end  224  can define the upper end of the guide pipe  220 . 
     The first end  223  can be disposed on the first pipe portion  221   a , and the second end  224  can be disposed on the second pipe portion  221   b.    
     The first pipe portion  221   a  can be disposed in the first space S 1 , that is, a resonance chamber. The second pipe portion  221   b  can be disposed in the second space S 2 , that is, a cavity chamber. 
     A through-hole  225  can be defined in the first pipe portion  221   a . The through-hole  225  can be understood as a resonance hole. Noise generated during the operation of the compressor can be absorbed toward the first space S 1  through the through-hole  225  to reduce the noise. 
     The through-hole  225  can be defined so that at least a portion of the outer circumferential surface of the first pipe portion  221   a  passes through the through-hole  25  between the inside and the outside. 
     An assembly process of the first and second suction muffler portions  130  and  140  and the suction guide device  200  will be briefly described. 
     First, the suction guide device  200  is mounted inside the second suction muffler portion  140 . In some examples, a lower end of the guide pipe  220  can be inserted into the pipe discharge portion  143   b  of the suction pipe portion  143  and supported by the support stepwise portion  144 . 
     The partition wall plate  211  of the partition wall  210  can be supported by the second support jaw  146   b  of the second suction muffler portion  140 , and the protrusions  215   a  and  215   b  of the partition wall  210  can be supported on the inner circumferential surface of the second suction muffler portion  140 . 
     Next, the first suction muffler portion  130  is assembled to one side of the second suction muffler portion  140 . The assembly end  147  of the second suction muffler portion  140  can be inserted into the insertion space  134  between the inner wall  133  of the first suction muffler portion  130  and the first muffler flange  132 . 
     In some implementations, a lower end of the first suction muffler portion  130 , in particular, a lower end of the inner wall  133 , can press the protrusions  215   a  and  215   b  of the suction guide device  200 , and thus, the suction guide device  200  can be firmly fixed to the inside of the suction muffler portions  130  and  140 . 
       FIG. 13  is a view illustrating an example flow of the refrigerant suctioned in the suction muffler. Referring to  FIG. 13 , an operation of the refrigerant suction in the suction muffler portions  130  and  140  will be briefly described. 
     When the reciprocating compressor  1  starts to operate, the refrigerant is introduced into a shell  10  through the suction pipe  12  and is introduced into the suction muffler portions  130  and  140  through the suction hole  142 . 
     The refrigerant can be introduced into the second suction muffler portion  140  to flow through the suction pipe portion  143 . The refrigerant is introduced into the first end  223  of the guide pipe  220  through the pipe discharge portion  143   b  to flow upward from the partition wall  210  along an extension direction of the guide pipe  220 . 
     In some examples, a portion of the refrigerant can flow into the first space S 1  through the through-hole  225 , and the through-hole  225  can function as a resonance hole of the resonance chamber. 
     The refrigerant flowing through the guide pipe  220  can be discharged into the second space S 2  through the second end  224 . In some examples, the refrigerant can increase in flow cross-sectional area to reduce an occurrence of noise. 
     The refrigerant in the suction muffler portions  130  and  140  can be introduced into the suction and discharge tank  120  and then be suctioned into a compression space C of a cylinder  33  through a suction valve of the valve assembly. 
       FIGS. 14A and 14B  are experimental graphs illustrating an example of a noise reduction effect in the suction muffler provided with the suction guide device. 
       FIG. 14A  is a graph illustrating an example of an intensity of noise generated in a frequency range of a specific band when a refrigerant used in the reciprocating compressor is R600a according to the related art and the present disclosure. The frequency range of the specific band represents a range of about 100 Hz to about 10 kHz. 
     The related art can be defined as a technique using a suction muffler without the suction guide device, and the present disclosure can be defined as a technique in which the suction guide device  200  described above is provided inside the suction muffler portions  130  and  140 . 
     An intensity of noise generated in the suction muffler according to the present disclosure is less than that of noise generated by the suction muffler according to the related art, over the frequency range (about 100 Hz to about 10 kHz). 
     In some examples, noise (about 27.4 dBA) of the suction muffler according to the present disclosure is reduced by about 1 dBA than noise (28.4 dBA) of the suction muffler according to the related art. 
       FIG. 14B  is a graph illustrating an example of an intensity of noise when a refrigerant used in the reciprocating compressor is R134a according to the related art and the present disclosure. Experimental conditions are the same as those described in  FIG. 14A . 
     An intensity of noise generated in the suction muffler according to the present disclosure is less than that of noise generated by the suction muffler according to the related art, over the frequency range (about 100 Hz to about 10 kHz). 
     In some examples, noise (about 26.7 dBA) of the suction muffler according to the present disclosure can be reduced by about 1 dBA than noise (27.7 dBA) of the suction muffler according to the related art. 
     In some examples, the suction guide device can be provided inside the suction muffler according to the present disclosure to reduce the noise in the resonance chamber and the cavity chamber. 
     In some implementations, the muffler assembly having the resonance chamber can be provided to reduce the noise generated in the compressor. 
     In some implementations, the partition wall, which divides the inner space of the suction muffler into the two spaces, can be provided to reduce the noise. 
     In particular, the partition wall can be installed in the suction muffler to divide the inner space into the resonance chamber and the cavity chamber, and the partition wall can be stably supported on the inner surface of the suction muffler. 
     In some implementations, the guide pipe communicating with the suction hole of the suction muffler can be provided in the partition wall to easily guide the refrigerant from the first space to the second space. 
     In some implementations, the suction pipe portion extending from the suction hole to the guide pipe can be provided to easily transfer the refrigerant suctioned through the suction hole to the guide pipe. 
     In some implementations, the support structure for the guide pipe and the suction pipe portion can be provided to facilitate the assembly of the guide pipe and the suction pipe portion and allow the guide pipe to be stably supported on the suction pipe portion during the suction of the refrigerant. 
     In some implementations, the protrusion can be provided on the partition wall to allow the guide pipe to be stably supported on the suction muffler. 
     In some implementations, the through-hole (resonance hole) can be defined in the guide pipe to reduce the noise generated in the compressor. 
     Although implementations have been described with reference to a number of illustrative implementations thereof, it should be understood that numerous other modifications and implementations can be devised by those skilled in the art that will fall within the spirit and scope of the principles of this disclosure. More particularly, various variations and modifications are possible in the component parts and/or arrangements of the subject combination arrangement within the scope of the disclosure, the drawings and the appended claims. In addition to variations and modifications in the component parts and/or arrangements, alternative uses will also be apparent to those skilled in the art.