KR20230174534A - Reciprocating compressor - Google Patents

Abstract

A reciprocating compressor according to an aspect of the present specification includes a suction/discharge section that sucks refrigerant, supplies it to the compression section, and discharges the compressed refrigerant from the compression section, the suction/discharge section includes a suction muffler and a discharge muffler, and the discharge muffler includes a plurality of discharge muffler members spaced apart from each other, and neighboring discharge muffler members among the plurality of discharge muffler members are connected by a discharge hose.
The reciprocating compressor of this configuration can reduce the size (or volume) of the discharge muffler member located adjacent to the suction muffler among the plurality of discharge muffler members, and can move the discharge muffler member corresponding to the reduced size (volume) to another location. It can be formed in , and the size (or volume) of the suction muffler can be increased as the size (or volume) of the discharge muffler member located adjacent to the suction muffler is reduced.

Description

Reciprocating compressor{RECIPROCATING COMPRESSOR}

This specification relates to a reciprocating compressor, and more specifically, to a reciprocating compressor equipped with a multiple discharge muffler.

In general, a closed compressor is a compressor that is equipped with an electric part that generates power inside a sealed container and a compression part that operates by receiving the power of the electric part.

The sealed compressor can be classified into reciprocating type, rotary type, vane type, scroll type, etc. depending on the method of compressing the refrigerant, which is a compressible fluid.

In the reciprocating compressor, a crankshaft is coupled to the rotor of the electric drive unit, a connecting rod is coupled to the crankshaft, and the piston coupled to the connecting rod compresses the refrigerant while reciprocating in a straight line inside the cylinder. .

The reciprocating compressor includes a sealed container that forms a closed space, a motor unit that is provided in the sealed vessel and rotates, a compression unit that is installed on the upper side of the motor unit and compresses the refrigerant by receiving the rotational force of the motor unit, and sucks the refrigerant. It includes a suction unit that supplies the compression unit, and a discharge unit that discharges the refrigerant compressed in the compression unit.

And the suction part includes a suction pipe fixed to the sealed container, and a suction muffler for supplying the refrigerant sucked from the suction pipe to the compression unit, and the discharge part includes a discharge pipe fixed to the sealed container, and a suction muffler that attenuates the discharge noise of the discharged refrigerant. It includes a discharge muffler and a discharge hose connecting the discharge muffler and the discharge pipe.

In a reciprocating compressor of this configuration, the suction muffler and discharge muffler must each have a volume of a certain size or more. As the size of the compressor decreases, the volume occupied by the suction muffler and discharge muffler, respectively, out of the total volume inside the sealed container increases. do.

Here, “volume” means the volume of the internal space of the muffler filled with refrigerant and/or discharge gas.

Therefore, when trying to (ultra)miniaturize a compressor, as the size of the compressor becomes smaller, the size (or volume) of the suction muffler and discharge muffler must also become smaller.

Here, an ultra-small compressor refers to a compressor whose width, depth, or height is 110 mm or less, based on the size of the sealed container.

However, when the height of the compressor is reduced by 9mm to (ultra)miniaturize the compressor, the heights of the suction muffler and discharge muffler are reduced by 6mm, respectively, so the volume of the suction muffler and the volume of the discharge muffler are reduced compared to before reducing the height of the compressor. The volume decreases to approximately 85%.

Therefore, there is a problem in that the cooling ability of the compressor is reduced due to a decrease in the volume of the suction muffler, which reduces the performance of the compressor by about 2%, and there is a problem in that the discharge pulsation increases due to a decrease in the volume of the discharge muffler.

Additionally, in order to prevent the cooling ability of the ultra-small compressor from being deteriorated, there is a problem in that the discharge pulsation further increases when the compressor is operated at a high speed of 85 rps or higher.

And since the conventional reciprocating compressor is equipped with only one discharge muffler, there is a problem in that it cannot effectively reduce pulsation noise of various frequencies.

This specification is intended to solve the above problems.

The technical problem to be solved by this specification is to provide an ultra-miniaturized reciprocating compressor without reducing the volume of the suction muffler and the volume of the discharge muffler.

Another technical problem to be solved by this specification is to provide an ultra-small reciprocating compressor that can prevent cooling capacity from being deteriorated.

Another technical problem to be solved by this specification is to provide an ultra-small reciprocating compressor that can effectively reduce discharge pulsation.

Another technical problem that this specification aims to solve is to provide an ultra-small reciprocating compressor that can effectively reduce pulsation noise of various frequencies.

The technical problems to be achieved in this specification are not limited to the technical problems mentioned above, and other technical problems not mentioned can be clearly understood by those skilled in the art from the description below. You will be able to.

A reciprocating compressor according to an aspect of the present specification includes a closed container forming a closed space; A discharge pipe coupled to an airtight container; An electric unit that includes a stator and a rotor and is installed inside the sealed container to generate rotational force; A compression unit comprising a connecting rod that converts the rotational force of the electric unit into a linear driving force, a piston connected to the connecting rod, and a cylinder into which the piston is movably inserted, and compresses a refrigerant; and a suction/discharge unit including a suction muffler, a discharge muffler, and a suction/discharge tank including a suction space into which the refrigerant passing through the suction muffler flows, and a discharge space into which the refrigerant compressed in the compression unit flows.

And the discharge muffler includes a main muffler located on the opposite side of the suction muffler with the suction and discharge tank in between, and a plurality of discharge mufflers including sub mufflers located at a distance from the main muffler and connected to each other by a discharge hose. It includes a muffler member, and the suction muffler has an extension portion extending from a lower side of the suction/discharge tank toward the main muffler.

According to this configuration, the size (or volume) of the main muffler located adjacent to the intake muffler among the plurality of discharge muffler members can be reduced, and an amount of discharge muffler members corresponding to the reduced size (volume) can be formed at another location. In addition, the size (or volume) of the intake muffler can be increased as the size (or volume) of the main muffler located adjacent to the intake muffler is reduced.

Therefore, it is possible to (ultra) miniaturize the reciprocating compressor without reducing the volumes of the suction muffler and discharge muffler compared to the prior art.

In addition, even if the operating speed is increased to improve the insufficient cooling power due to the (ultra) small size of the compressor, the discharge pulsation can be effectively reduced, thereby preventing the cooling ability from being deteriorated.

In other words, cooling power can be increased in proportion to increasing the operating speed of the compressor.

In addition, since various discharge muffler members can be formed along the discharge path of the discharge gas, the empty space inside the sealed container can be utilized to the maximum, and multiple discharge muffler members can be designed to reduce discharge pulsation noise of a specific frequency. You can.

The main muffler may have a larger volume than the sub muffler.

According to this configuration, a plurality of discharge muffler members can be designed to make it possible to reduce discharge pulsation noise of a specific frequency.

The sub muffler may include a first sub muffler connected to the main muffler by the discharge hose, and a second sub muffler connected to the first sub muffler by the discharge hose.

The volumes of the main muffler, the first sub-muffler, and the second sub-muffler can be formed in various ways to make it possible to reduce discharge pulsation noise of a specific frequency.

As an example, the volume of the main muffler may be larger than the volume of the first sub muffler and the volume of the second sub muffler, and the volume of the first sub muffler may be larger than the volume of the second sub muffler. can do.

At this time, the volume of the first sub muffler can be formed to be less than 50% of the volume of the main muffler, and the volume of the second sub muffler can be formed to be less than 50% of the volume of the first sub muffler.

According to this configuration, discharge pulsation noise can be effectively reduced.

At least one of the first sub-muffler and the second sub-muffler may be formed by expanding the diameter of a portion of the discharge hose.

According to this configuration, the manufacturing process and assembly process of the sub muffler can be reduced.

The first sub muffler and the second sub muffler may each be formed in a cylindrical shape.

According to this configuration, installation space for the sub muffler can be easily secured.

The second sub muffler may be directly coupled to the discharge pipe.

According to this configuration, the number of discharge hoses can be reduced.

The at least two sub mufflers may further include a third sub muffler located between the main muffler and the first sub muffler.

According to this configuration, discharge pulsation noise can be reduced more effectively.

The third sub muffler may be located adjacent to the extension of the intake muffler on the lower side of the main muffler, and may be connected to the main muffler by the discharge hose, and may be connected to the first sub muffler by the discharge hose. can be connected

Accordingly, installation space for the third sub muffler can be easily secured.

The width of the third sub muffler may be smaller than the width of the main muffler.

According to this configuration, discharge pulsation noise can be reduced more effectively.

The volume of the main muffler may be larger than that of the third sub muffler, and the volume of the third sub muffler may be larger than the volume of the first sub muffler.

At this time, the volume of the third sub muffler may be formed to be less than 50% of the volume of the main muffler, the volume of the first sub muffler may be formed to be less than 50% of the volume of the third sub muffler, and the volume of the second sub muffler may be formed to be less than 50% of the volume of the third sub muffler. The volume of may be less than 50% of the volume of the first sub muffler.

According to this configuration, discharge pulsation noise can be reduced more effectively.

According to the reciprocating compressor of the present specification, the size (or volume) of the main muffler located adjacent to the suction muffler with the suction and discharge tank between the plurality of discharge muffler members can be reduced, and the size (or volume) corresponding to the reduced size (volume) can be reduced. As many discharge muffler members can be formed in different positions, and the size (or volume) of the suction muffler can be increased as the size (or volume) of the main muffler located adjacent to the suction muffler is reduced.

Therefore, it is possible to (ultra) miniaturize the reciprocating compressor without reducing the volumes of the suction muffler and discharge muffler compared to the prior art.

In addition, even if the operating speed is increased to improve the insufficient cooling power due to the (ultra) small size of the compressor, the discharge pulsation can be effectively reduced, thereby preventing the cooling ability from being deteriorated.

In other words, cooling power can be increased in proportion to increasing the operating speed of the compressor.

In addition, since various discharge muffler members can be formed along the discharge path of the discharge gas, the empty space inside the sealed container can be utilized to the maximum, and multiple discharge muffler members can be designed to reduce discharge pulsation noise of a specific frequency. You can.

The effects that can be obtained in this specification are not limited to the effects mentioned above, and other effects not mentioned can be clearly understood by those skilled in the art from the description below. .

The accompanying drawings, which are included as part of the detailed description to aid understanding of the present specification, provide examples of the present specification and explain technical features of the present specification together with the detailed description.
1 is an external perspective view of a reciprocating compressor according to an embodiment of the present specification.
Figure 2 is an exploded perspective view of a reciprocating compressor according to an embodiment of the present specification.
Figure 3 is a cross-sectional view of a reciprocating compressor according to an embodiment of the present specification.
Figure 4 is a diagram showing a partial configuration of a reciprocating compressor according to an embodiment of the present specification.
Figure 5 is a front perspective view showing the connection of the muffler assembly and discharge hose according to an embodiment of the present specification.
Figure 6 is a rear perspective view showing the connection of the muffler assembly and discharge hose according to an embodiment of the present specification.
Figure 7 is a schematic diagram showing the connection between the muffler assembly and discharge hose shown in Figures 5 and 6.
Figure 8 is a schematic diagram showing the connection of a muffler assembly and a discharge hose according to another embodiment of the present specification.
Figure 9 is a schematic diagram showing the connection of a muffler assembly and a discharge hose according to another embodiment of the present specification.
Figure 10 is a schematic diagram showing the connection of a muffler assembly and a discharge hose according to another embodiment of the present specification.
Figure 11 is a graph showing the change in outlet pressure according to the number of discharge muffler members of a reciprocating compressor.
FIG. 12 is a graph showing the effect of improving discharge pulsation of a reciprocating compressor equipped with the muffler assembly shown in FIG. 10.
Figure 13 is a schematic diagram showing the connection of a muffler assembly and a discharge hose according to another embodiment of the present specification.

Hereinafter, embodiments disclosed in the present specification will be described in detail with reference to the attached drawings. However, identical or similar components will be assigned the same reference numbers regardless of reference numerals, and duplicate descriptions thereof will be omitted.

The suffixes “assembly” and “part” for components used in the following description are given or used interchangeably only considering the ease of preparing the specification, and do not have distinct meanings or roles in themselves.

Additionally, in describing the embodiments disclosed in this specification, if it is determined that detailed descriptions of related known technologies may obscure the gist of the embodiments disclosed in this specification, the detailed descriptions will be omitted.

In addition, the attached drawings are only for easy understanding of the embodiments disclosed in this specification, and the technical idea disclosed in this specification is not limited by the attached drawings, and all changes included in the spirit and technical scope of this specification are not limited. , should be understood to include equivalents or substitutes.

Terms containing ordinal numbers, such as first, second, etc., may be used to describe various components, but the components are not limited by the terms. The above terms are used only for the purpose of distinguishing one component from another.

When a component is said to be “coupled” or “assembled” to another component, it is understood that it may be directly connected to or assembled with the other component, but that other components may also exist in between. It should be.

On the other hand, when a component is referred to as being “directly coupled” or “directly assembled” to another component, it should be understood that there are no other components in between.

Singular expressions include plural expressions unless the context clearly dictates otherwise.

In this application, terms such as “comprise” or “have” are intended to designate the presence of features, numbers, steps, operations, components, parts, or combinations thereof described in the specification, but are not intended to indicate the presence of one or more other features. It should be understood that this does not exclude in advance the possibility of the existence or addition of elements, numbers, steps, operations, components, parts, or combinations thereof.

Hereinafter, preferred embodiments according to the present specification will be described in detail with reference to the attached drawings. However, identical or similar components will be assigned the same reference numbers regardless of the reference numerals, and duplicate descriptions thereof will be omitted.

Hereinafter, the reciprocating compressor according to the present specification will be described in detail with reference to the accompanying drawings.

FIG. 1 is a perspective view of a reciprocating compressor according to an embodiment of the present specification, FIG. 2 is an exploded perspective view of a reciprocating compressor according to an embodiment of the present specification, and FIG. 3 is a cross-sectional view of a reciprocating compressor according to an embodiment of the present specification. am.

Referring to FIGS. 1 to 3, the reciprocating compressor 10 according to an embodiment of the present specification includes a sealed container 100 forming the exterior, an electric motor provided in the internal space of the sealed container 100 and providing driving force. The compression unit 300 receives the driving force from the eastern unit 200 and the electric drive unit 200 and compresses the refrigerant through a linear reciprocating motion, and the refrigerant for compressing the refrigerant in the compression unit 300 is sucked in and the compression unit ( It includes a suction/discharge unit 400 that discharges the compressed refrigerant from 300).

The sealed container 100 forms a sealed space inside, and various parts of the compressor 10 are accommodated in this sealed space. The sealed container 100 is made of a metal material and includes a lower sealed container 110 and an upper sealed container 160.

The lower sealed container 110 has a roughly hemispherical shape, and various parts forming the transmission unit 200, compression unit 300, suction/discharge unit 400, and compressor 10 together with the upper sealed container 160. Forms a space that accommodates them.

The lower sealed container 110 may be referred to as a “compressor body” and the upper sealed container 160 may be referred to as a “compressor cover.”

The lower sealed container 110 is provided with a suction pipe 120, a discharge pipe 130, a process pipe 140, and a power supply unit (not shown).

The suction pipe 120 introduces refrigerant into the sealed container 100 and is mounted through the lower sealed container 110.

The suction pipe 120 may be separately mounted on the lower sealed container 110 or may be formed integrally with the lower sealed container 110.

The discharge pipe 130 discharges the refrigerant compressed in the sealed container 100 and is installed through the lower sealed container 110.

The discharge pipe 130 may also be separately mounted on the lower sealed container 110 or may be formed integrally with the lower sealed container 110.

The discharge hose 800 of the suction/discharge unit 400, which will be described later, is connected to the discharge pipe 130. The refrigerant that flows into the suction pipe 120 and is compressed through the compression unit 300 may be discharged to the discharge pipe 130 through the discharge hose 800 of the intake and discharge unit 400.

The process pipe 140 is a device provided to charge refrigerant into the sealed container 100 after sealing the inside of the sealed container 100, and includes the suction pipe 120 and the discharge pipe 130 Together, they can be mounted through the lower sealed container 110.

The upper sealed container 160 forms a receiving space together with the lower sealed container 110, and is formed in a substantially hemispherical shape like the lower sealed container 110. The upper sealed container 160 packages the lower sealed container 110 on the upper side of the lower sealed container 110, forming a sealed space therein.

The transmission unit 200 includes stators 210 and 220, an insulator 230, a rotor 240, and a rotating shaft 250.

The stators 210 and 220 are fixed parts during driving of the electric motor 200 and include a stator core 210 and a stator coil 220.

The stator core 210 is made of a metal material and may have an approximately cylindrical shape with an internal hollow.

And, the stator coil 220 is mounted inside the stator core 210. When power is applied from the outside, the stator coil 220 generates electromagnetic force and performs electromagnetic interaction with the stator core 220 and the rotor 240. Through this, the transmission unit 200 can generate a driving force for the reciprocating movement of the compression unit 300.

The insulator 230 is disposed between the stator core 210 and the stator coil 220 and prevents direct contact between the stator core 210 and the stator coil 220.

If the stator coil 220 is in direct contact with the stator core 210, the generation of electromagnetic force from the stator coil 220 may be interrupted, and this is to prevent this.

The insulator 230 may space the stator core 210 and the stator coil 220 apart from each other by a predetermined distance.

The rotor 240 is rotatably provided inside the stator coil 220 and may be installed within the insulator 230. The rotor 240 is provided with a magnet.

When power is supplied from the outside, the rotor 240 rotates through electromagnetic interaction with the stator core 210 and the stator coil 220.

The rotational force resulting from the rotation of the rotor 240 acts as a driving force that can drive the compression unit 200.

The rotation shaft 250 is installed within the rotor 240, is mounted to penetrate the rotor 240 along the vertical direction, and can rotate together with the rotor 240. In addition, the rotation shaft 250 is connected to a connecting rod 340, which will be described later, and transmits the rotational force generated by the rotor 240 to the compression unit 300.

To explain this, the rotating shaft 250 includes a base shaft 252, a rotating plate 254, and an eccentric shaft 256.

The base shaft 252 is mounted in the rotor 240 in a vertical direction (Z-axis direction) or vertically. When the rotor 240 rotates, the base shaft 252 may rotate together with the rotor 240.

The rotation plate 254 is installed on one side of the base shaft 252 and can be rotatably mounted on the rotation plate seating portion 320 of the cylinder block 310.

The eccentric shaft 256 protrudes upward from the upper surface of the rotating plate 254.

Specifically, the eccentric shaft 256 protrudes at a position eccentric from the axial center of the base shaft 252 and rotates eccentrically when the rotation plate 254 rotates.

A connecting rod 340 is mounted on the eccentric shaft 256. According to the eccentric rotation of the eccentric shaft 256, the connecting rod 340 reciprocates linearly in the front-back direction (X-axis direction).

The compression unit 300 includes a cylinder block 310, a connecting rod 340, a piston 350, and a piston pin 370.

The cylinder block 310 is provided on the upper side of the electric drive unit 200, more specifically, the rotor 240, and is mounted inside the sealed container 100. The cylinder block 310 includes a rotating plate seating portion 320 and a cylinder 330.

The rotation plate seating portion 320 is formed at the lower part of the cylinder block 310 and rotatably accommodates the rotation plate 254. A shaft opening 322 through which the rotating shaft 250 can pass is formed in the rotating plate seating portion 320.

The cylinder 330 is provided in the front part of the cylinder block 310 and is arranged to accommodate a piston 350, which will be described later. The piston 350 can reciprocate in the front-back direction (X-axis direction), and a compression space C that can compress the refrigerant is formed inside the cylinder 330.

The cylinder 330 may be made of aluminum. For example, the cylinder 330 may be made of aluminum or aluminum alloy.

Due to the non-magnetic aluminum material, the magnetic flux generated by the rotor 240 is not transmitted to the cylinder 330. Accordingly, the magnetic flux generated in the rotor 240 can be prevented from being transmitted to the cylinder 330 and leaking to the outside of the cylinder 330.

The connecting rod 340 is a device for transmitting the driving force provided from the transmission unit 200 to the piston 350, and converts the rotational motion of the rotary shaft 250 into a linear reciprocating motion.

The connecting rod 340 reciprocates linearly in the front-back direction (X-axis direction) when the rotary shaft 250 rotates. The connecting rod 340 may be made of a sintered alloy material.

The piston 350 is a device for compressing refrigerant, and is accommodated within the cylinder 330 to be capable of reciprocating movement in the front-back direction (X-axis direction). The piston 350 is connected to the connecting rod 340. The piston 350 reciprocates linearly within the cylinder 330 according to the movement of the connecting rod 340. According to the reciprocating motion of the piston 350, the refrigerant introduced from the suction pipe 120 may be compressed within the cylinder 330.

The piston 350, like the cylinder 330, may be made of an aluminum material, for example, aluminum or an aluminum alloy.

Accordingly, the magnetic flux generated in the rotor 240 can be prevented from leaking to the outside through the piston 350.

In addition, the piston 350 is made of the same material as the cylinder 330 and may have a thermal expansion coefficient substantially the same as that of the cylinder 330.

As it has almost the same coefficient of thermal expansion, when the compressor 10 is driven, in the internal environment of the sealed container 100 at a high temperature (generally, approximately 100° C.), the piston 350 expands by almost the same amount as the cylinder 330. It is thermally deformed. Therefore, when the piston 350 reciprocates within the cylinder 330, interference between the piston 350 and the cylinder 330 can be prevented.

The piston pin 370 couples the piston 350 and the connecting rod 340. In detail, the piston pin 370 penetrates the piston 350 and the connecting rod 340 in the vertical direction (Z-axis direction) to connect the piston 350 and the connecting rod 340.

The intake/discharge unit 400 includes a muffler assembly 410, a valve assembly 480, a discharge hose 800, a plurality of gaskets 485, 488, an elastic member 490, and a clamp 492. .

The muffler assembly 410 delivers the refrigerant sucked from the suction pipe 120 to the inside of the cylinder 330, and delivers the refrigerant compressed in the compression space C of the cylinder 330 to the discharge pipe 130. .

To this end, the muffler assembly 410 includes a suction space (S) that accommodates the refrigerant sucked from the suction pipe 120 and a discharge space (D) that accommodates the refrigerant compressed in the compression space (C) of the cylinder 330. This is prepared.

The refrigerant sucked from the suction pipe 120 flows into the suction space S of the suction and discharge tank 426 through suction mufflers 430 and 420, which will be described later. In addition, the refrigerant compressed in the cylinder 330 passes through the discharge space D of the suction and discharge tank 426, passes through a discharge muffler to be described later, and is discharged to the outside of the compressor 10 through the discharge hose 800. do.

The valve assembly 480 guides the refrigerant in the suction space (S) into the cylinder 330 or guides the refrigerant compressed in the cylinder 330 to the discharge space (D).

For this purpose, a discharge valve 483 is provided on the front of the valve assembly 480 to be openable and closed to discharge the compressed refrigerant from the compression space C to the discharge space D, and the valve assembly 480 At the rear, an intake valve 481 is provided that can be opened and closed to export the refrigerant from the intake space (S) to the compression space (C) of the cylinder (330).

That is, a discharge valve 483 is provided on the front of the valve assembly 480, and an intake valve 481 is provided on the rear of the valve assembly 420.

The operation of the discharge valve 483 and the suction valve 481 will be briefly explained.

When the compressed refrigerant is discharged from the compression space C within the cylinder 330, the discharge valve 483 is opened and the intake valve 481 is closed. Accordingly, the refrigerant compressed within the cylinder 330 may flow into the discharge space (D) rather than into the suction space (S).

Conversely, when the refrigerant flowing into the suction space S is sucked into the cylinder 330, the discharge valve 483 is closed and the suction valve 481 is opened. Accordingly, the refrigerant in the suction space (S) may flow into the cylinder 330 without flowing into the discharge space (D).

The discharge hose 800 is a device that delivers compressed refrigerant contained in the discharge space D to the discharge pipe 130, and is coupled to the muffler assembly 410. One side of the discharge hose 800 is coupled to the muffler assembly 410 to communicate with the discharge space D, and the other side of the discharge hose 800 is coupled to the discharge pipe 130.

The plurality of gaskets 485 and 488 are devices for preventing refrigerant leakage, and are mounted on one side and the other side of the valve assembly 420, respectively.

In detail, the plurality of gaskets 485 and 488 include a first gasket 485 and a second gasket 488. The first gasket 485 is mounted on the front of the valve assembly 480, and the second gasket 488 is mounted on the rear of the valve assembly 420.

The elastic member 490 is used to support the muffler assembly 410 when the compressor 10 is driven, and is mounted on the front of the muffler assembly 410. The elastic member 490 may include a Belleville Spring.

The clamp 492 secures the valve assembly 480, the first gasket 485, the second gasket 488, and the elastic member 490 to the muffler assembly 410. The clamp 492 has an approximate tripod shape and can be mounted on the muffler assembly 410 through a fastening means such as a screw member.

In addition, the compressor 10 further includes a plurality of damper members 500, 550, 600, and 650 and a balance weight 700.

The plurality of damper members 500, 550, 600, and 650 cushion vibrations of internal structures generated when the compressor 10 is driven. The plurality of damper members 500, 550, 600, and 650 include a front damper 500, a rear damper 550, and a lower damper 600, 650.

The front damper 500 cushions the vibration of the suction/discharge unit 400 and may be made of a rubber material. The front damper 500 may be coupled to the front upper portion of the cylinder block 310 through a fastening means coupled to the clamp 492.

The rear damper 550 cushions the vibration of the compression unit 300 and is mounted on the rear upper part of the cylinder block 310. The rear damper 550 may be made of rubber material.

The lower dampers 600 and 650 cushion the vibration of the electric drive unit 200 and are provided in plural pieces. The plurality of lower dampers 600 and 650 include a front lower damper 600 and a rear lower damper 650.

The front lower damper 600 cushions vibration on the front side of the transmission unit 200 and is mounted on the front lower side of the stator core 210. The rear lower damper 650 cushions the rear side vibration of the power transmission unit 200 and is mounted on the rear lower side of the stator core 210.

The balance weight 700 is a device for controlling rotational vibration when the rotation shaft 250 of the electric drive unit 200 rotates, and is coupled to the eccentric shaft 256 of the rotation shaft 250 on the upper side of the connecting rod 340. do.

Hereinafter, the configuration of the muffler assembly 410 and the discharge hose 800 will be described in detail.

FIG. 4 is a diagram showing a partial configuration of a reciprocating compressor according to an embodiment of the present specification, and FIG. 5 is a front perspective view showing the connection of a muffler assembly and a discharge hose according to an embodiment of the present specification.

And FIG. 6 is a rear perspective view showing the connection of the muffler assembly and the discharge hose according to an embodiment of the present specification, and FIG. 7 is a schematic diagram showing the connection of the muffler assembly and the discharge hose shown in FIGS. 5 and 6.

Before explaining specific embodiments of the present specification, briefly explaining the features of the reciprocating compressor of the present specification, the reciprocating compressor of the present specification includes a plurality of discharge muffler members, preferably three or more, Three or more discharge muffler members are connected in series or parallel.

The reciprocating compressor of this configuration can reduce the size (or volume) of the discharge muffler member located adjacent to the suction muffler with the suction and discharge tank between the plurality of discharge muffler members, and can reduce the size (or volume) of the discharge muffler member by an amount corresponding to the reduced size (volume). The discharge muffler member can be formed at a different location, and the size (or volume) of the suction muffler can be increased as the size (or volume) of the discharge muffler member located adjacent to the suction muffler is reduced.

Therefore, it is possible to (ultra) miniaturize the reciprocating compressor without reducing the volumes of the suction muffler and discharge muffler compared to the prior art.

In addition, even if the operating speed is increased to improve the insufficient cooling power due to the (ultra) small size of the compressor, the discharge pulsation can be effectively reduced, thereby preventing the cooling ability from being deteriorated.

In other words, cooling power can be increased in proportion to increasing the operating speed of the compressor.

In addition, since various discharge muffler members can be formed along the discharge path of the discharge gas, the empty space inside the sealed container can be utilized to the maximum, and multiple discharge muffler members can be designed to reduce discharge pulsation noise of a specific frequency. You can.

The structure of various muffler assemblies provided in the reciprocating compressor of this specification will be described.

4 to 7, the muffler assembly 410 according to an embodiment of the present specification includes a first assembly unit 430, a second assembly unit 420, a third assembly unit 425, and a fourth assembly unit. Part 438 is included.

The first assembly part 430 includes a suction hole 432 that communicates with the suction pipe 120. The suction hole 432 is located adjacent to the inside of a point of the lower sealed container 110 where the suction pipe 120 is coupled. An internal pipe 450 is installed inside the first assembly unit 430. For example, the internal pipe 450 may be composed of a pipe having a substantially cylindrical shape.

Inside the first assembly part 430, a first fixing part 441 for fixing the internal pipe 450 is installed. A through hole 442 corresponding to the suction hole 432 is formed in the first fixing part 441. Accordingly, when the first fixing part 441 is installed inside the first assembly part 430, the suction hole 432 and the through hole 442 may be aligned with each other.

And, the inner pipe 450 includes a first coupling part 454 coupled to the first fixing part 441.

The internal pipe 450 may extend upward from the first assembly part 430 and be coupled to the second assembly part 420. The second assembly part 420 includes a second fixing part coupled to the internal pipe 450. Additionally, the inner pipe 455 includes a second coupling portion 455 coupled to the second fixing portion.

The second assembly part 420 is coupled to the upper side of the first assembly part 430. At least a portion of the inner pipe 450 may be located inside the first assembly portion 430, and the remaining portion may be located inside the second assembly portion 420.

When the first assembly part 430 and the second assembly part 420 are combined, the refrigerant sucked into the compressor 10 is inside the first and second assembly parts 430 and 420, and the cylinder 330 A suction flow path that can flow toward is formed. Accordingly, the first and second assembly parts 430 and 420 can be collectively referred to as a “suction muffler.”

The third assembly part 425 is arranged to be spaced apart from one side of the second assembly part 420. And, between the second assembly part 420 and the third assembly part 425, a suction/discharge tank 426 forming the suction space (S) and the discharge space (D) is installed.

The suction and discharge tank 426 includes a partition portion 427 that divides the internal space of the suction and discharge tank 426 into the suction space (S) and the discharge space (D). Additionally, the valve assembly 480 may be installed on one side of the suction/discharge tank 426.

The suction space (S) may be shielded by the suction valve 481, and the discharge space (D) may be shielded by the discharge valve 483.

The fourth assembly part 438 is coupled to the lower side of the third assembly part 425. When the third assembly part 425 and the fourth assembly part 438 are combined, the refrigerant discharged from the cylinder 330 is inside the third and fourth assembly parts 425 and 438 through the discharge pipe. A discharge passage flowing toward (130) is formed.

Accordingly, the third and fourth assembly parts 425 and 438 can be collectively referred to as the “main muffler.”

Here, the “main muffler” refers to the muffler with the largest volume among the plurality of discharge muffler members provided in the reciprocating compressor of this specification.

Accordingly, the suction muffler and the main muffler are positioned spaced apart from each other on both sides of the suction and discharge tank 426 with the suction and discharge tank 426 in between.

In this specification, the third assembly part 425 can be referred to as the “muffler body” of the main muffler, and the fourth assembly part 438 can be referred to as the “muffler cover” of the main muffler.

A plurality of partition walls may be located in the internal space of the main muffler (425, 438) to form the internal space of the main muffler into a plurality of attenuation spaces, and the number of partition walls may be varied.

In this specification, the first assembly portion 430 of the suction muffler is installed at the lower side of the suction/discharge tank to have a width (W2) that is wider than the width (W1) of the second assembly portion (420) in the left-right direction (Y-axis direction). It is provided with an expansion part (430A) that extends toward the main mufflers (425, 438), and the expansion part (430A) is located in the lower part of the suction and discharge tank (426).

At this time, the expansion portion 430A is formed by passing the virtual center line CL of the suction/discharge tank 426 and further extending toward the main mufflers 425 and 438.

In addition, the internal volume of the expansion portion 430A is formed to be equal to the volume of the area A1 reduced compared to the conventional suction muffler or larger than the volume of the area A1 reduced compared to the conventional suction muffler.

However, the internal volume of the expansion portion 430A may be slightly smaller than the volume of the area A1, which is reduced compared to the conventional suction muffler.

Since the expansion portion 430A is formed by extending toward the main mufflers 425 and 438 through the virtual center line CL of the suction and discharge tank 426, the lower portions of the main mufflers 425 and 438 have a reduced width compared to the upper portions. It is formed by

According to this configuration, the intake mufflers 420 and 430 have a volume expanded by the volume of the expansion portion 430A compared to the case where the expansion portion 430A is not provided.

And compared to the case where the expansion portion 430A is not provided, the volume of the main mufflers 425 and 438 is reduced by the volume of the expansion portion 430A.

Therefore, in order to secure an additional volume corresponding to the reduced volume of the main mufflers 425 and 438, the discharge muffler member of the present specification further includes a sub muffler.

In this embodiment, at least one sub-muffler may be provided. In consideration of reduction of discharge pulsation and increase in cooling capacity, a case where at least two sub-mufflers are provided will be described below.

In this embodiment, the sub muffler is a first sub muffler 460A connected to the main muffler 425, 438 by a discharge hose 800, and connected to the first sub muffler 460A by a discharge hose 800. It includes a second sub muffler (460B).

At this time, the volumes of the main mufflers 425 and 438, the first sub muffler 460A, and the second sub muffler 460B can be formed in various ways to reduce the discharge pulsation noise of a specific frequency.

As an example, the volumes of the main mufflers 425 and 438 may be larger than the volumes of the first sub muffler 460A and the second sub muffler 460B, respectively, and the volume of the first sub muffler 460A is It can be formed to be larger than the volume of the second sub muffler 460B.

At this time, the volume of the first sub-muffler (460A) may be less than 50% of the volume of the main muffler (425, 438), and the volume of the second sub-muffler (460B) may be less than the volume of the first sub-muffler (460A). It can be formed to less than 50% of .

The first sub muffler 460A and the second sub muffler 460B may be formed separately from the discharge hose 800 and may be combined with the discharge hose 800.

In this case, the first sub muffler 460A and the second sub muffler 460B may each be formed in a cylindrical shape.

Additionally, the second sub muffler 460B may not be coupled to the discharge hose 800 but may be directly coupled to the discharge pipe 130 using a connector (not shown).

However, at least one of the first sub-muffler 460A and the second sub-muffler 460B may be formed by expanding the diameter of a portion of the discharge hose 800 as shown in FIG. 11.

And although the first sub muffler (460A), the second sub muffler (460B), and the main muffler (425, 438) may be connected in series, the first sub muffler (460A) and the second sub muffler (460B) are connected to the main muffler. It can also be connected in parallel to (425, 438).

In this case, the first sub-muffler (460A) and the second sub-muffler (460B) are connected in parallel to the main mufflers (425, 438) by different discharge hoses (800), and then connected to the connector provided in the discharge hose (130). can be combined with

According to this embodiment, the main mufflers 425 and 438, the first sub muffler 460A, and the second sub muffler 460B form a discharge muffler.

Additionally, the combined volume of the first sub-muffler 460A and the volume of the second sub-muffler 460B may be formed to be greater than the volume reduced by the expansion portion 430A of the intake muffler.

The refrigerant (or discharge gas) that sequentially passes through the main mufflers 425 and 438, the first sub muffler 460A, and the second sub muffler 460B is delivered to the discharge pipe 130.

The discharge hose 800 is preferably made of a flexible material, but this is not essential.

A portion of the discharge hose 800 may be supported by the hose fixing part 553. The hose fixing part 553 is coupled to the rear damper 550 and is configured to clamp the discharge hose 800.

As an example, the hose fixing part 553 has a pincer shape and may be arranged to surround at least a portion of the outer peripheral surface of the discharge hose 800. By the hose fixing part 553, the discharge hose 800 can be guided to be positioned away from the inner surface of the sealed container 100.

The discharge pipe 130 penetrates the lower sealed container 110 and extends into the interior of the lower sealed container 110, and a second sub muffler 460B is directly coupled to the discharge pipe 130, or The discharge hose 800 coupled to the second sub muffler 460B may be connected.

In order to facilitate connection between the discharge pipe 130 and the discharge hose 800, the discharge pipe 130 may be bent through the lower sealed container 110 and extend upward.

The discharge hose 800 may be made of a flexible rubber material, and the discharge pipe 130 may be made of a metal material, for example, copper (Cu).

According to this configuration, the suction muffler has an expansion portion, the discharge muffler is located adjacent to the suction muffler and can form a main muffler having a volume reduced by the volume of the expansion portion, and a volume equal to the reduced volume of the main muffler. Includes first and second sub mufflers.

Therefore, it is possible to (ultra) miniaturize the reciprocating compressor without reducing the volumes of the suction muffler and discharge muffler compared to the prior art.

In addition, even if the operating speed is increased to improve the insufficient cooling power due to the (ultra) small size of the compressor, the discharge pulsation can be effectively reduced, thereby preventing the cooling ability from being deteriorated.

In other words, cooling power can be increased in proportion to increasing the operating speed of the compressor.

In addition, since the discharge muffler can be formed in various ways along the discharge path of the discharge gas, the empty space inside the sealed container can be utilized to the fullest and it is possible to reduce discharge pulsation noise of a specific frequency.

FIG. 8 is a schematic diagram showing the connection of a muffler assembly and a discharge hose according to another embodiment of the present specification, and FIG. 9 is a schematic diagram showing the connection of a muffler assembly and a discharge hose according to another embodiment of the present specification.

In describing this embodiment, the same reference numerals are assigned to components that are the same or similar to those of the above-described embodiment, and detailed description thereof is omitted.

In the above-described embodiment, a reciprocating compressor was described in which the expansion portion 430A of the suction muffler has a uniform width in the vertical direction.

However, the expansion portion 430A of the intake muffler is formed in a shape whose width increases downward as shown in FIG. 8, or as shown in FIG. 9, the width increases downward and then decreases again. It may also be formed in a decreasing shape.

In this way, the expansion portion 430A can be formed in various shapes.

Figure 10 is a schematic diagram showing the connection of a muffler assembly and a discharge hose according to another embodiment of the present specification.

In the above-described embodiments, a reciprocating compressor having a main muffler (425, 438) whose lower width is smaller than the upper width due to the expansion portion (430A) of the suction muffler has been described.

However, the reciprocating compressor of this embodiment is provided with main mufflers 425 and 438 formed in approximately the same shape as the conventional discharge muffler, and in addition to the first sub muffler 460A and the second sub muffler 460B, the main muffler A third sub muffler (460C) is further provided below the (425, 438) adjacent to the extension portion (430A).

In other words, it can be understood that the reciprocating compressor of this embodiment is formed by dividing the main muffler of the above-described embodiment into two.

The third sub muffler 460C is connected to the main mufflers 425 and 438 by the discharge hose 800, and is also connected to the first sub muffler 460A by the discharge hose 800.

In the left-right direction (Y-axis direction), the width W3 of the third sub muffler 460C may be smaller than the width W4 of the main mufflers 425 and 438.

In addition, the volume of the main mufflers 425 and 438 may be larger than the volume of the third sub muffler 460C, and the volume of the third sub muffler 460C may be larger than the volume of the first sub muffler 460A. The volume of the first sub-muffler 460A may be larger than the volume of the second sub-muffler 460B.

At this time, the volume of the third sub muffler 460C may be less than 50% of the volume of the main muffler 425, 438, and the volume of the first sub muffler 460A may be less than the volume of the third sub muffler 460C. The volume of the second sub muffler 460B can be formed to be less than 50% of the volume of the first sub muffler 460A.

And the first sub muffler 460A, the second sub muffler 460B, and the third sub muffler 460C may be sequentially connected in series to the main mufflers 425 and 438 by the discharge hose 800, but the first sub muffler 460B At least two sub mufflers among the muffler 460A, the second sub muffler 460B, and the third sub muffler 460C may be connected in parallel to the main mufflers 425 and 438.

In this case, the first sub-muffler 460A and the second sub-muffler 460B may be connected in parallel to the third sub-muffler 460C through different discharge hoses 800.

Additionally, the first sub muffler 460A and the third sub muffler 460C may be connected in parallel to the main mufflers 425 and 438 through different discharge hoses 800.

FIG. 11 is a graph showing the change in outlet pressure according to the number of discharge muffler members of the reciprocating compressor, and FIG. 12 is a graph showing the effect of improving discharge pulsation of the reciprocating compressor equipped with the muffler assembly shown in FIG. 10.

The graph in FIG. 11 compares the outlet pressure in the case of two discharge mufflers and the outlet pressure in the case of four discharge mufflers with the outlet pressure in the conventional case with only one discharge muffler, in the case of four discharge mufflers. Corresponds to the embodiment of Figure 10.

And the graph in FIG. 12 compares the discharge pressure in the case of four discharge mufflers with the discharge pressure in the conventional case with only one discharge muffler. The case with four discharge mufflers corresponds to the embodiment of FIG. 10.

Referring to Figures 11 and 12, when multiple discharge mufflers are formed by dividing the discharge muffler into a plurality of discharge mufflers, preferably 3 or more, more preferably 4 or more, as disclosed herein, one discharge muffler It can be seen that the outlet pressure and discharge pressure are lowered compared to the conventional case provided only.

Therefore, discharge pulsation can be improved.

The discharge hose 800 can be double-injected together with the discharge muffler, and when one muffler is formed by two parts like the main muffler 425 and 438, the first assembly part and the second assembly part are laser welded. can be combined by

And the inlet and outlet of the discharge muffler do not necessarily need to be aligned.

It is obvious to those skilled in the art that the present specification can be embodied in other specific forms without departing from the essential features of the present specification. Accordingly, the above detailed description should not be construed as restrictive in all respects and should be considered illustrative. The scope of this specification should be determined by reasonable interpretation of the appended claims, and all changes within the equivalent scope of this specification are included in the scope of this specification.

410: muffler assembly 420, 430: intake muffler
430A: Extension 425, 438: Main muffler
460A: 1st sub muffler 460B: 2nd sub muffler
460C: Third sub muffler

Claims (15)

An airtight container forming an airtight space;
A discharge pipe coupled to an airtight container;
An electric unit that includes a stator and a rotor and is installed inside the sealed container to generate rotational force;
A compression unit comprising a connecting rod that converts the rotational force of the electric unit into a linear driving force, a piston connected to the connecting rod, and a cylinder into which the piston is movably inserted, and compresses a refrigerant; and
A suction/discharge unit having a suction muffler, a discharge muffler, and a suction/discharge tank having a suction space into which the refrigerant passing through the suction muffler flows and a discharge space into which the refrigerant compressed in the compression part flows.
Including,
The discharge muffler is a plurality of discharge mufflers including a main muffler located on the opposite side of the suction muffler with the suction and discharge tank in between, and sub mufflers located spaced apart from the main muffler and connected to each other by a discharge hose. Includes absence,
The suction muffler is a reciprocating compressor including an expansion portion extending from a lower side of the suction/discharge tank toward the main muffler. In paragraph 1:
A reciprocating compressor wherein the main muffler has a larger volume than the sub muffler. In paragraph 1:
The sub-muffler is a reciprocating compressor including a first sub-muffler connected to the main muffler by the discharge hose, and a second sub-muffler connected to the first sub-muffler by the discharge hose. In paragraph 3,
A reciprocating compressor wherein the main muffler has a volume larger than the first sub-muffler and the second sub-muffler. In paragraph 4,
A reciprocating compressor in which the volume of the first sub-muffler is larger than the volume of the second sub-muffler. In paragraph 4,
A reciprocating compressor wherein a volume of the first sub muffler is formed to be less than 50% of the volume of the main muffler, and a volume of the second sub muffler is formed to be less than 50% of the volume of the first sub muffler. In paragraph 4,
A reciprocating compressor wherein at least one of the first sub-muffler and the second sub-muffler is formed by expanding the diameter of a portion of the discharge hose. In paragraph 4,
The first sub-muffler and the second sub-muffler are each formed in a cylindrical shape. In paragraph 4,
The second sub-muffler is a reciprocating compressor directly coupled to the discharge pipe. In any one of paragraphs 3 to 9,
The at least two sub-mufflers further include a third sub-muffler located between the main muffler and the first sub-muffler. In paragraph 10:
The third sub muffler is located adjacent to the extension of the intake muffler on the lower side of the main muffler, is connected to the main muffler by the discharge hose, and is a reciprocating type connected to the first sub muffler by the discharge hose. compressor. In paragraph 11:
A reciprocating compressor in which the width of the third sub muffler is smaller than the width of the main muffler. In paragraph 11:
A reciprocating compressor in which the volume of the main muffler is larger than the volume of the third sub-muffler. In paragraph 13:
A reciprocating compressor in which the volume of the third sub-muffler is larger than the volume of the first sub-muffler. In paragraph 14:
The volume of the third sub-muffler is 50% or less of the volume of the main muffler, the volume of the first sub-muffler is 50% or less of the volume of the third sub-muffler, and the volume of the second sub-muffler is 50% or less. A reciprocating compressor whose volume is formed to be less than 50% of the volume of the first sub muffler.

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