KR102344070B1 - A compressor - Google Patents

Abstract

The present invention relates to a scroll compressor having a selectable fixing part installed inside the compression part to prevent the reverse rotation of the scroll and to be installed on the rotation shaft so as to block the reverse flow of oil.

Description

Compressor {A compressor}

The present invention relates to a compressor. More particularly, it relates to a scroll compressor capable of preventing reverse rotation by negative pressure when driving is stopped.

In general, a compressor is a device applied to a refrigeration cycle (hereinafter, abbreviated as refrigeration cycle) such as a refrigerator or an air conditioner, and provides work necessary for heat exchange in the refrigeration cycle by compressing the refrigerant.

The compressor may be classified into a reciprocating type, a rotating seat type, a scroll type, etc. according to a method of compressing the refrigerant. Among them, the scroll compressor is a compressor in which a compression chamber is formed between the fixed lap of the fixed scroll and the orbiting lap of the orbiting scroll by engaging the orbiting scroll with a fixed scroll fixed to the accommodation space of the hermetically sealed container and rotating.

Compared to other types of compressors, the scroll compressor is continuously compressed through the interlocking scroll shape, so a relatively high compression ratio can be obtained, and the suction, compression, and discharge strokes of the refrigerant are smoothly continued to obtain a stable torque. For this reason, scroll compressors are widely used for refrigerant compression in air conditioners and the like.

Referring to Japanese Patent Publication No. 6344452, a conventional scroll compressor includes a case having an external appearance and having a discharge unit for discharging refrigerant, a compression unit fixed to the case to compress the refrigerant, and a compression unit fixed to the case to compress the refrigerant and a driving unit for driving the unit, wherein the compression unit and the driving unit are coupled to the driving unit and connected by a rotating shaft.

The compression unit includes a fixed scroll fixed to the case and having a fixed wrap, and an orbiting scroll including an orbiting wrap driven by being engaged with the fixed wrap by the rotation shaft. In such a conventional scroll compressor, the rotating shaft is eccentric, and the orbiting scroll is fixed to the eccentric rotating shaft and rotates. As a result, the orbiting scroll orbits (orbits) along the fixed scroll and compresses the refrigerant.

In such a conventional scroll compressor, the compression unit is provided under the discharge unit, and the driving unit is provided below the compression unit. In general, the rotating shaft has one end coupled to the compression unit and the other end passing through the driving unit.

In the conventional scroll compressor, since the compression unit is provided above the driving unit and close to the discharge unit, it is difficult to supply oil to the compression unit. There were downsides. In addition, the conventional scroll compressor has a problem in that efficiency and reliability are deteriorated due to tilting of the scroll because the action points of the gas force generated by the refrigerant in the compressor and the reaction force supporting the same do not match.

In order to solve this problem, referring to Korean Patent Application Laid-Open No. 10-2018-0124636, recently, a scroll compressor in which the driving unit is located under the discharge unit and the compression unit is located under the driving unit has appeared. . (aka lower scroll compressor or through shaft scroll compressor).

The through-axis scroll compressor has the advantage of smooth oil supply because the compression unit 300 is provided closer to the oil storage space than the driving unit. In addition, since the compression unit 300 itself supports the rotating shaft extending from the driving unit, a structure for separately supporting the rotating shaft may be omitted, thereby simplifying the structure.

In addition, when the rotary shaft completely penetrates the compression unit 300 , since the rotation shaft supports vibration or pressure generated in the compression unit 300 in the longitudinal direction, there is an advantage in that the reliability of the compressor is improved.

1 shows the structure of a conventional through-axis scroll compressor.

1(a), the compression unit includes an orbiting scroll 330 rotatably accommodating the rotation shaft 230, and a fixed scroll 320 that engages with the orbiting scroll to form a compression chamber in which the refrigerant is compressed; , which is seated on the fixed scroll 320 and may include a main frame 310 accommodating the orbiting scroll 330 .

The rotating shaft 230 may include an eccentric shaft 232 whose diameter is extended so that the portion accommodated in the orbiting scroll 330 is biased toward one side. Accordingly, as the rotating shaft 230 rotates, the eccentric shaft 232 presses the orbiting scroll 330 along the circumference of the fixed scroll 320 to flow along the orbiting scroll 330 and the fixed scroll 320 . The refrigerant can be continuously compressed.

Since friction may occur between the orbiting scroll 330 and the fixed scroll 320 in the process of compressing the refrigerant, and may be overheated as the temperature of the refrigerant rises, the conventional compressor has a rotating shaft 230 and a main frame ( 310) and the fixed scroll 320 may further include an oil supply passage for delivering oil. The oil supply passage I was extended to an area facing the orbiting wrap 333 of the orbiting scroll 330 to deliver oil to the compression chamber.

The oil supply passage I includes a supply passage 234 provided in the rotation shaft 230 , a delivery passage 319 provided in the main frame 310 , and a fixed passage 329 provided in the fixed scroll 320 . ) can be composed of

The refrigerant is actually discharged from the fixed scroll 320, and the region adjacent to the rotating shaft 230 corresponds to the high-pressure region S1, and the region where the refrigerant actually starts to be compressed between the fixed scroll and the orbiting scroll is the high-pressure region. It corresponds to the intermediate pressure region V1 lower than the region S1. Therefore, the oil supply passage I supplies oil from the supply passage 234 to the intermediate pressure region V1 without a separate power due to the pressure difference between the high pressure region S1 and the intermediate pressure region V1. can

Referring to FIG. 1B , when the conventional compressor is stopped from driving, the refrigerant compressed in the high-pressure region S1 expands, so that the orbiting scroll 330 may revolve in the opposite direction. The orbiting scroll 330 may not revolve in a direction in which the refrigerant is compressed, but may orbit in a direction in which the refrigerant is expanded.

Accordingly, the orbiting wrap 333 and the fixed wrap 323 may collide unintentionally, causing unnecessary noise, and problems such as wear and damage may occur.

In addition, as the orbiting scroll 330 revolves in the opposite direction, a negative pressure is formed in the high-pressure region S1 , and the oil contained in the orbiting scroll 330 and the fixed scroll 320 is applied to the rotation shaft 230 . A problem of backflow into the supply flow path 234 may also occur.

When the oil between the orbiting scroll 330 and the fixed scroll 320 flows backwards, the amount of oil remaining inside the compression unit 300 may decrease. In particular, when a siphon phenomenon occurs, the compression unit ( 300) All of the oil inside may move to the oil storage space.

In this case, when the compressor 10 is operated again, the orbiting wrap 333 and the fixed wrap 323 are not lubricated until the oil is supplied again to the inside of the compression unit 300 to ensure the reliability of the compressor. There was a problem that couldn't be done.

Recently, as in Korean Patent Publication No. 10-2004-0091033, a compressor in which a non-return valve or the like is installed in the compression part has appeared. However, this conventional compressor also did not solve the fundamental problem that the orbiting scroll 330 rotates in reverse, and a separate valve is installed to increase flow resistance, and a separate space must be secured for installing the valve. there was a problem with

An object of the present invention is to provide a compressor that prevents the orbiting scroll from revolving in a direction opposite to that of compressing a refrigerant in a scroll compressor including an orbiting scroll and a fixed scroll.

An object of the present invention is to provide a compressor in which an orbiting scroll revolves in only one direction.

An object of the present invention is to provide a compressor capable of preventing reverse flow of oil remaining between an orbiting scroll and a fixed scroll when the operation of the compressor is finished.

An object of the present invention is to provide a compressor capable of only supplying oil to the orbiting scroll and the fixed scroll, and preventing oil from leaking inside the orbiting scroll and the fixed scroll.

An object of the present invention is to provide a compressor capable of preventing reverse rotation of an orbiting scroll as well as preventing reverse flow of oil.

An object of the present invention is to provide a compressor that prevents the reverse rotation of the orbiting scroll and prevents the reverse flow of oil in an existing compressor internal space, thereby eliminating the need to separately secure an installation space.

In order to solve the above problems, the present invention provides a structure for preventing reverse rotation of an orbiting scroll.

The prevention structure can apply the principle of a ratchet wheel capable of only one-way movement, and can be composed of a rotating wheel / fixed wheel. The prevention structure may be provided to be engaged with each other when stopped, and reverse rotation due to a pressure difference between the refrigerant inlet and the refrigerant outlet may be prevented. The prevention structure may be provided as an engagement valve structure.

When the rotatable member and the fixed member are engaged with each other, a flow path through which oil moves may be blocked, thereby preventing an oil backflow.

The prevention structure is characterized in that it can block reverse rotation and reverse flow at the same time by combining the structural forced reverse rotation prevention device and the valve principle.

Since the prevention structure is mechanically installed on the rotating shaft, reliability can be ensured even when the compressor is repeatedly operated or stopped.

The prevention structure may be disposed in the compression unit and the muffler mounting unit.

The prevention structure may be composed of a rotary wheel that is mounted on the rotary shaft (press-fitting / weakly pressed-in) and rotates together with the shaft, and a fixed wheel that does not rotate together with a member such as a spring in a muffler or the like.

Due to the above structure, the rotating wheel can only be rotated in one way, so that reverse rotation can be prevented when stopped. The fixed wheel can move up and down, so that it can serve as a valve when stopped.

On the other hand, when the structure is stopped, the function of the non-return valve due to the sealing of the center may include an external pipe or an external control system (actuator) that can be replaced.

The rotary wheel may be provided to rotate with a rotary shaft. The rotary wheel may be weakly press-fitted to the rotation shaft, and a middle part flow path (hole) may be formed.

The rotary wheel may have a D-shaped groove similar to a trochoid.

The rotating wheel may have a movable surface so that oil flows inward in the rotational direction.

The fixed wheel may be provided to move in an axial direction.

The fixed wheel may be provided with an internal O-ring or a sealing agent press-fitted.

The fixed wheel may be provided to seal the oil delivery path by engaging with the rotating type when closely contacting after stopping.

The fixed wheel and the rotatable wheel may be prevented from rotating with a key and a keyway.

The fixed wheel and the rotary wheel may be spaced apart by the height of the key, and the fixed wheel may reciprocate.

In addition, the fixed wheel and the rotary wheel may have a flow path through which oil passes as much as the clearance of the keyway.

According to the present invention, in a scroll compressor including an orbiting scroll and a fixed scroll, there is an effect of preventing the orbiting scroll from revolving in a direction opposite to the direction in which the refrigerant is compressed.

The present invention has the effect of providing a compressor in which the orbiting scroll revolves in only one direction.

The present invention has the effect of preventing the reverse flow of oil remaining between the orbiting scroll and the fixed scroll when the operation of the compressor is finished.

According to the present invention, oil is only supplied to the orbiting scroll and the fixed scroll, and it is possible to prevent the oil from leaking in the orbiting scroll and the fixed scroll.

The present invention has the effect of preventing the reverse rotation of the orbiting scroll as well as the reverse flow of oil.

According to the present invention, a configuration for preventing reverse rotation of the orbiting scroll and preventing the reverse flow of oil is installed in the internal space of the existing compressor, thereby eliminating the need to secure an installation space separately.

1 shows the structure of a conventional compressor.
2 shows the basic structure of the compressor of the present invention.
3 is a view showing a structure for preventing rotation and preventing flow path reverse flow of the compressor of the present invention.
4 shows the detailed structure of the selection fixing part.
5 is a diagram illustrating an operation method of the selection fixing unit.
6 shows another embodiment of the selection fixing unit.
7 shows a detailed structure of the selection fixing part of FIG.
8 is a view showing the operation of the compressor of the present invention.

Hereinafter, embodiments disclosed in the present specification will be described in detail with reference to the accompanying drawings. In this specification, even in different embodiments, the same and similar reference numerals are assigned to the same and similar components, and the description is replaced with the first description. As used herein, the singular expression includes the plural expression unless the context clearly dictates otherwise. In addition, in describing the embodiments disclosed in the present 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 description thereof will be omitted. In addition, it should be noted that the accompanying drawings are only for easy understanding of the embodiments disclosed in the present specification, and should not be construed as limiting the technical spirit disclosed herein by the accompanying drawings.

2 illustrates the basic structure of a compressor according to an embodiment of the present invention. The scroll compressor (10) of the present invention is generally installed on a circuit of a refrigerant cycle including a condenser (2), an expansion valve (3), and an evaporator (4).

The scroll compressor 10 according to an embodiment of the present invention includes a case 100 having a space in which a fluid is stored or flowing, and a driving unit 200 coupled to an inner circumferential surface of the case 100 to rotate a rotating shaft 230 . , may include a compression unit 300 provided to compress the fluid by being coupled to the rotation shaft 230 inside the case.

Specifically, the case 100 may have a discharge unit 121 through which the refrigerant is discharged on one side. The case 100 is provided in a cylindrical shape and includes a housing shell 110 accommodating the driving unit 200 and the compression unit 300 , and is coupled to one end of the housing shell 110 so that the discharge unit 121 is formed. The provided discharge shell 120 and the blocking shell 130 coupled to the other end of the receiving shell 110 to seal the receiving shell 110 may be included.

The driving unit 200 includes a stator 210 for generating a rotating magnetic field, and a rotor 220 provided to rotate by the rotating magnetic field, and the rotating shaft 230 is coupled to the rotor 220 , It may be provided to rotate together with the rotor 220 .

The stator 210 is provided with a plurality of slots formed along the circumferential direction on its inner circumferential surface to be wound with a coil, and can be fixed to the inner circumferential surface of the accommodating shell 110, the rotor 220 is a permanent magnet coupled and is rotatably coupled inside the stator 210 to generate rotational power. The rotation shaft 230 may be press-fitted to the center of the rotor 220 .

The compression unit 300 is coupled to the receiving shell 110 and is coupled to and fixed to a fixed scroll 320 provided in a direction away from the discharge unit 121 from the driving unit 200 and the rotating shaft 230 . An orbiting scroll 330 engaged with the scroll 320 to form a compression chamber, and a main frame accommodating the orbiting scroll 330 and seated on the fixed scroll 320 to form the appearance of the compression unit 330 ( 310) may be included.

As a result, in the scroll compressor 10 , the driving unit 200 is disposed between the discharge unit 120 and the compression unit 300 . In other words, the driving unit 200 may be provided on one side of the discharge unit 120 , and the compression unit 300 may be provided in a direction away from the discharge unit 121 from the driving unit 200 . For example, when the discharge unit 121 is provided on the upper portion of the case 100 , the compression unit 300 is provided under the driving unit 200 , and the driving unit 200 is provided on the discharge unit It may be provided between 120 and the compression unit 300 .

Accordingly, when oil is stored in the case 100 , the oil may be directly supplied to the compression unit 300 without passing through the driving unit 200 . In addition, since the rotation shaft 230 is coupled to and supported by the compression unit 300 , a lower frame that separately rotatably supports the rotation shaft may be omitted.

On the other hand, in the scroll compressor 10 of the present invention, the rotating shaft 230 passes through not only the orbiting scroll 330 but also the fixed scroll 320 to make surface contact with both the orbiting scroll 330 and the fixed scroll 320 . can be provided to do so.

Due to this, an inflow force generated when a fluid such as a refrigerant flows into the compression unit 300, a gas force generated when the refrigerant is compressed inside the compression unit 300, and a reaction force supporting the same are applied to the rotation shaft ( 230) can act as it is. Accordingly, the inlet force, gas force, and reaction force may be applied to one action point of the rotation shaft 230 . As a result, since an overturning moment does not act on the orbiting scroll 320 coupled to the rotation shaft 230 , tilting or overturning of the orbiting scroll can be fundamentally blocked. In other words, up to axial vibration among the vibrations generated in the orbiting scroll 330 may be attenuated or prevented, and the overturning moment of the orbiting scroll 330 may also be attenuated or suppressed. Accordingly, noise and vibration generated by the lower scroll compressor 10 may be blocked. In addition, since the fixed scroll 320 supports the rotation shaft 230 in surface contact, even when the inflow and gas forces act on the rotation shaft 230 , durability of the rotation shaft 230 can be reinforced. In addition, the rotation shaft 230 partially absorbs or supports the back pressure generated while the refrigerant is discharged to the outside, so that the orbiting scroll 330 and the fixed scroll 320 are in close contact excessively in the axial direction (vertical). drag) can be reduced. As a result, the frictional force between the orbiting scroll 330 and the fixed scroll 230 can also be greatly reduced.

As a result, the compressor 10 attenuates the axial shaking and overturning moment of the orbiting scroll 330 inside the compression unit 300 , and reduces the frictional force of the orbiting scroll, thereby increasing the efficiency of the compression unit 300 . and reliability.

On the other hand, the main frame 310 of the compression unit 300 includes a main head plate 311 provided on one side of the driving unit 200 or a lower portion of the driving unit 300 , and an inner peripheral surface of the main mirror plate 311 . A main side plate 312 extending in a direction away from the driving part 200 and seated on the fixed scroll 330, and a main shaft bearing part extending from the main mirror plate 311 to rotatably support the rotating shaft 230 ( 318) may be included.

A main hole 317 for guiding the refrigerant discharged from the fixed scroll 320 to the discharge unit 121 may be further provided in the main head plate 311 or the main side plate 312 .

The main mirror plate 311 may further include an oil pocket 314 engraved outside the main shaft portion 318 . The oil pocket 314 may be provided in an annular shape, and may be provided so as to be eccentric from the main shaft portion 318 . The oil pocket 314 is provided to be supplied to a portion where the fixed scroll 320 and the orbiting scroll 330 are engaged when the oil stored in the blocking shell 130 is transferred through the rotating shaft 230 and the like. can be

The fixed scroll 320 is provided in combination with the receiving shell 110 in a direction away from the driving unit 300 from the main head 311 to form the other surface of the compression unit 300. A fixed head plate 321 ) And, a fixed side plate 322 extending from the fixed head plate 321 toward the discharge part 121 and provided to contact the main side plate 312, the fixed side plate 322 is provided on the inner circumferential surface to compress the refrigerant It may include a fixing wrap 323 forming a compression chamber.

On the other hand, the fixed scroll 320 has a fixed through-hole 328 provided so that the rotating shaft 230 passes therethrough, and a fixed shaft portion 3281 extending from the fixed through-hole 328 so that the rotating shaft is rotatably supported. may include The fixed shaft portion 3281 may be provided in the center of the fixed head plate 321 .

The thickness of the fixed head plate 321 may be the same as the thickness of the fixed shaft portion 3281 . In this case, the fixed shaft portion 3281 may not protrude and extend from the fixed end plate 321 , but may be inserted into the fixed through hole 328 to be provided.

A suction port 325 for introducing a refrigerant into the fixed wrap 323 may be provided at the fixed side plate 322 , and an outlet 326 through which the refrigerant is discharged may be provided at the fixed end plate 321 . The discharge port 326 may be provided in the center direction of the fixed lap 323, but in order to avoid interference with the fixed bearing unit 3281, it may be provided spaced apart from the fixed bearing unit 3281, and a plurality of can be provided with

The orbiting scroll 330 includes a turning mirror plate 331 provided between the main frame 310 and the fixed scroll 320, and an orbiting wrap forming a compression chamber together with the fixed wrap 323 in the orbiting mirror plate. (333).

The orbiting scroll 330 may further include an orbiting through-hole 338 provided to pass through the orbiting mirror plate 331 so that the rotating shaft 230 is rotatably supported.

The rotating shaft 230 may be provided such that a portion coupled to the orbiting through-hole 338 is eccentric. Accordingly, when the rotating shaft 230 rotates, the orbiting scroll 330 engages and moves along the fixed lap 323 of the fixed scroll 320 to compress the refrigerant.

Specifically, the rotating shaft 230 includes a main shaft 231 coupled to the driving unit 200 to rotate, and a support shaft connected to the main shaft 231 and rotatably coupled to the compression unit 300 ( 232) may be provided. The support shaft 232 is provided as a separate member from the main shaft 231 , and may be provided to accommodate the main shaft 231 therein, or may be provided integrally with the main shaft 231 . .

The support shaft 232 is inserted into the main shaft portion 318 of the main frame 310 to be rotatably supported by the main support shaft 232a and the fixed shaft portion 3281 of the fixed scroll 320 . The fixed support shaft 232c provided to be inserted and rotatably supported, and the main support shaft 232a and the fixed support shaft 232c provided between the orbiting scroll 330 is inserted and rotated into the orbiting through hole 338 of the orbiting scroll 330 . It may include an eccentric shaft 232b that is possibly supported.

At this time, the main support shaft 232a and the fixed support shaft 232c are formed on a coaxial line to have the same axial center, and the eccentric shaft 232b has a center of gravity of the main support shaft 232a or the fixed support shaft 232c. It may be formed eccentrically in the radial direction with respect to . In addition, the eccentric shaft 232b may have an outer diameter larger than the outer diameter of the main support shaft 232a or the outer diameter of the fixed support shaft 232c. Accordingly, the eccentric shaft 232b provides a force to compress the refrigerant while the orbiting scroll 330 orbitally moves when the support shaft 232 rotates, and the orbiting scroll 320 is the fixed scroll 320 ) may be provided to rotate regularly by the eccentric shaft (232b).

However, in order to prevent the orbiting scroll 320 from rotating, the compressor 10 of the present invention may further include an Oldham's ring 340 coupled to the upper portion of the orbiting scroll 320 . The Oldham ring 340 may be provided between the orbiting scroll 330 and the main frame 310 to contact both the orbiting scroll 330 and the main frame 310 . The Oldham ring 340 is provided to linearly move in four directions of front, back, left, and right to prevent rotation of the orbiting scroll 320 .

Meanwhile, the rotation shaft 230 may be provided to completely penetrate the fixed scroll 320 and protrude to the outside of the compression unit 300 . Accordingly, the oil stored outside the compression unit 300 and the blocking shell 130 and the rotation shaft 230 can come into direct contact, and the rotation shaft 230 rotates inside the compression unit 300 . Oil can be supplied.

The oil may be supplied to the compression unit 300 through the rotation shaft 230 . An oil supply flow path 234 for supplying the oil to the outer circumferential surface of the main support shaft 232a, the fixed support shaft 232c, and the eccentric shaft 232b in the rotary shaft 230 or the inside of the rotary shaft. can be formed.

In addition, a plurality of oil supply holes 234a, b, c, and d may be formed in the oil supply passage 234 . Specifically, the refueling hole may include a first refueling hole 234a, a second refueling hole 234b, a third refueling hole 234c, and a fourth refueling hole 234d. First, the first oil supply hole (234a) may be formed to penetrate the outer peripheral surface of the main support shaft (232a).

The first oil supply hole 234a may be formed to penetrate from the oil supply passage 234 to the outer peripheral surface of the main support shaft 232a. In addition, the first oil supply hole (234a), for example, may be formed to pass through the upper portion of the outer peripheral surface of the main support shaft (232a), but is not limited thereto. That is, it may be formed to penetrate the lower part of the outer peripheral surface of the main support shaft 232a. For reference, the first refueling hole 234a may include a plurality of holes, unlike that shown in the drawing. In addition, when the first oil supply hole 234a includes a plurality of holes, each hole may be formed only on the upper or lower portion of the outer peripheral surface of the main support shaft 232a, and upper and lower portions of the outer peripheral surface of the main support shaft 232a. may be formed in each.

In addition, the rotation shaft 230 may include an oil shaft 233 provided to pass through a muffler 500 to be described later and contact the oil stored in the case 100 . The oil shaft 233 is provided in a spiral shape on the outer circumferential surface of the extension shaft 233a passing through the muffler 500 and in contact with the oil and the extension shaft 233a, and a spiral groove communicating with the supply passage 234 . (233b).

As a result, when the rotation shaft 230 rotates, the oil due to the viscosity of the helical groove 233b and the oil and the pressure difference between the high pressure region S1 and the intermediate pressure region V1 inside the compression unit 300 , It rises through the oil shaft 233 and the supply passage 234 and is discharged to the plurality of oil supply holes. The oil discharged through the plurality of oil supply holes 234a, 234b, 234c, and 234d forms an oil film between the fixed scroll 250 and the orbiting scroll 240 to maintain an airtight state, and the compression unit 300 is It may be provided to absorb and radiate the frictional heat generated in the frictional portion between the components.

The oil guided along the rotation shaft 230 and the oil supplied through the first oil supply hole 234a may be provided to lubricate the main frame 310 and the rotation shaft 230 . In addition, the oil may be discharged through the second oil supply hole 234b and supplied to the upper surface of the orbiting scroll 240 , and the oil supplied to the upper surface of the orbiting scroll 240 may be guided to the intermediate pressure chamber through the pocket groove 314 . can For reference, oil discharged through the second oil supply hole 234b as well as the first oil supply hole 234a or the third oil supply hole 234d may be supplied to the pocket groove 314 .

Meanwhile, the oil guided along the rotating shaft 230 may be supplied to the Oldham ring 340 installed between the orbiting scroll 240 and the main frame 230 and the fixed side plate 322 of the fixed scroll 320 . . Through this, it is possible to reduce wear of the fixed side plate 322 and the Oldham ring 340 of the fixed scroll 320 . In addition, the oil supplied to the third oil supply hole 234c is supplied to the compression chamber, thereby reducing wear due to friction between the orbiting scroll 330 and the fixed scroll 320 as well as forming an oil film and dissipating heat. Compression efficiency can be improved.

Meanwhile, although the centrifugal refueling structure in which the lower scroll compressor 10 supplies oil to the bearings using the rotation of the rotating shaft 230 has been described so far, this is only an example, and the pressure difference inside the compression unit 300 is used. It goes without saying that a differential pressure refueling structure for refueling oil and a forced refueling structure for supplying oil through a torochoid pump, etc. can be applied.

Meanwhile, the compressed refrigerant is discharged to the discharge port 326 along the space formed by the fixed wrap 323 and the orbit wrap 333 . The discharge port 326 may be more advantageously provided toward the discharge unit 121 . This is because it is most advantageous for the refrigerant discharged from the discharge port 326 to be delivered to the discharge unit 121 without a significant change in the flow direction.

However, the compression unit 300 is provided in a direction away from the discharge unit 121 from the driving unit 200 , and the fixed scroll 320 is provided at the outermost portion of the compression unit 300 . Due to the negative characteristics, the discharge port 326 is provided to inject the refrigerant in the opposite direction to the discharge unit 121 .

In other words, the discharge port 326 is provided to inject the refrigerant in a direction away from the discharge unit 121 from the fixed head plate 321 . Accordingly, when the refrigerant is directly injected into the discharge port 326 , the refrigerant may not be smoothly discharged to the discharge unit 121 , and when oil is stored in the blocking shell 130 , the refrigerant collides with the oil Therefore, there is a risk of cooling or mixing.

To prevent this, the compressor 10 of the present invention may further include a muffler 500 coupled to the outermost portion of the fixed scroll 320 to provide a space for guiding the refrigerant to the discharge unit 121 . .

The muffler 500 seals one surface of the fixed scroll 320 in a direction away from the discharge unit 121 so as to guide the refrigerant discharged from the fixed scroll 320 to the discharge unit 121 . can be provided to do so.

The muffler 500 may include a coupling body 520 coupled to the fixed scroll 320 and a receiving body 510 extending from the coupling body 520 to form a closed space. Accordingly, the refrigerant injected from the discharge port 326 may be discharged to the discharge unit 121 by changing the flow direction along the sealed space formed by the muffler 500 .

On the other hand, since the fixed scroll 320 is provided by being coupled to the receiving shell 110 , the refrigerant may be prevented from moving to the discharge unit 121 by being obstructed by the fixed scroll 320 . Accordingly, the fixed scroll 320 may further include a bypass hole 327 through which the refrigerant may pass through the fixed head plate 321 through the fixed scroll 320 . The bypass hole 327 may be provided to communicate with the main hole 327 . Accordingly, the refrigerant may pass through the compression unit 300 , pass through the driving unit 200 , and be discharged to the discharge unit 121 .

On the other hand, since the refrigerant is compressed at a higher pressure from the outer circumferential surface of the fixing wrap 323 toward the inside, the inside of the fixing wrap 323 and the orbiting wrap 333 maintain a high pressure state. Accordingly, the discharge pressure acts on the rear surface of the orbiting scroll as it is, and the back pressure acts from the orbiting scroll toward the fixed scroll as a reaction reaction. The compressor 10 of the present invention has a back pressure seal that prevents leakage between the orbiting wrap 333 and the fixed wrap 323 by focusing the back pressure on the portion where the orbiting scroll 320 and the rotating shaft 230 are coupled. (seal, 350) may be further included.

The back pressure seal 350 is provided in a ring shape to maintain the inner circumferential surface at high pressure, and separate the outer circumferential surface at an intermediate pressure lower than the high pressure. Accordingly, the back pressure is concentrated on the inner circumferential surface of the back pressure seal 350 so that the orbiting scroll 330 is brought into close contact with the fixed scroll 320 .

Considering that the outlet 326 is provided to be spaced apart from the rotation shaft 230 , the back pressure seal 350 may also be disposed to be centered toward the outlet 326 . In addition, due to the back pressure seal 350 , the oil supplied from the first oil supply groove 234a may be supplied up to the inner peripheral surface of the back pressure seal 350 . Accordingly, the oil may lubricate the contact surfaces of the main scroll and the orbiting scroll. Furthermore, the oil supplied to the inner circumferential surface of the back pressure seal 350 may form a back pressure for pushing the orbiting scroll 330 to the fixed scroll 320 together with a portion of the refrigerant.

Accordingly, the compression space of the fixed wrap 323 and the orbiting wrap 333 based on the back pressure seal 350 is the high pressure area S1 of the inner area of the back pressure seal 350 and the back pressure seal 350 ) may be divided into an intermediate pressure region V1. Of course, since the pressure increases while the refrigerant is introduced and compressed, the high-pressure region S1 and the intermediate-pressure region V1 can be naturally divided. However, since a pressure change may critically occur due to the existence of the back pressure seal 350 , the compression space may be divided by the back pressure chamber 350 .

Meanwhile, the oil supplied to the compression unit 300 or the oil stored in the case 100 may move together with the refrigerant as the refrigerant is discharged to the discharge unit 121 . At this time, the oil has a higher density than the refrigerant and cannot move to the discharge unit 121 due to the centrifugal force generated by the rotor 220 , and is located on the inner wall of the discharge shell 110 and the receiving shell 120 . is attached The scroll compressor 10 includes the driving unit 200 and the compression unit 300 to recover the oil attached to the inner wall of the case 100 to the oil storage space of the case 100 or the blocking shell 130 . may further include a recovery passage on the outer peripheral surface.

The recovery flow path includes a driving return flow path 201 provided on the outer circumferential surface of the driving unit 200 , a compression recovery flow path 301 provided on the outer circumferential surface of the compression unit 300 , and an outer circumferential surface of the muffler 500 . It may include a muffler return passage 501 that is.

The driving return passage 201 may be provided with a part of the outer peripheral surface of the stator 210 depressed, and the compression recovery passage 301 may be provided with a part of the outer peripheral surface of the fixed scroll 320 depressed. In addition, the muffler recovery passage 501 may be provided in which a part of the outer peripheral surface of the muffler is depressed. The drive return passage 201, the compression return passage 301, and the muffler return passage 501 may communicate with each other to allow oil to pass therethrough.

As described above, since the center of gravity of the rotation shaft 230 is biased to one side due to the eccentric shaft 232b, an unbalanced eccentric moment may occur during rotation, and thus the overall balance may be disturbed. Accordingly, the scroll compressor 10 of the present invention may further include a balancer 400 capable of offsetting an eccentric moment that may occur due to the eccentric shaft 232b.

Since the compression unit 300 is fixed to the case 100 , the balancer 400 is preferably coupled to the rotation shaft 230 itself or the rotor 220 provided to rotate. Accordingly, the balancer 400 is a center balancer 410 provided on one surface toward the lower end of the rotor 220 or the compression unit 300 to offset or reduce the eccentric load of the eccentric shaft 232b and , The outer balancer coupled to the upper end of the rotor 220 or the other surface toward the discharge part 121 to offset the eccentric load or eccentric moment of at least one of the eccentric shaft 232b or the lower balancer 420 ( 420) may be included.

Since the center balancer 410 is provided relatively close to the eccentric shaft 232b, there is an advantage that can directly offset the eccentric load of the eccentric shaft 232b. Therefore, it is preferable that the center balancer 410 is eccentric in a direction opposite to the eccentric shaft 232b. As a result, even when the rotating shaft 230 rotates at a low speed or a high speed, the eccentric shaft 232b and the spaced distance are close, so that the eccentric force or the eccentric load generated from the eccentric shaft 232b is effectively offset. can

The outer balancer 420 may be provided to be eccentric in a direction opposite to the eccentric shaft 232b. However, the outer balancer 420 may be provided eccentrically in a direction corresponding to the eccentric shaft 232b to partially offset the eccentric load generated by the center balancer 410 .

Accordingly, the center balancer 410 and the outer balancer 420 may offset the eccentric moment generated by the eccentric shaft 232b to assist the rotation shaft 230 to rotate stably.

Meanwhile, in the compressor of the present invention, when the rotation of the rotating shaft 230 is stopped, the force supporting the compressed refrigerant between the orbiting wrap 333 and the fixed wrap 323 disappears. Accordingly, the orbiting scroll 330 may move in the opposite direction to the direction in which the refrigerant is compressed by re-expanding from the refrigerant in the high-pressure region S1 near the discharge port 326 .

In this process, the orbiting wrap 333 and the fixed wrap 323 may collide and rub differently than intended during design, and wear and/or damage may occur.

In addition, when the orbiting scroll 330 moves in the opposite direction, a negative pressure is generated between the orbiting scroll 330 and the fixed scroll 320 so that the fixed flow path 234 in the rotating shaft 230 has the lowest pressure. Also, oil between the orbiting wrap 333 and the fixed wrap 323 may flow back into the fixed flow path 234 .

Accordingly, the orbiting wrap 333 and the fixed wrap 323 may become insufficient in oil, and when the compressor 10 starts again, the orbiting scroll 330 and the fixed scroll 320 may There is a problem in that the reliability of the compressor is not guaranteed due to severe wear and friction.

To prevent this, the compressor 10 of the present invention structurally prevents the orbiting scroll 330 from moving in the opposite direction to the compression direction, and may include a selection fixing part 700 that can prevent the reverse flow of oil. can

3 shows a structure in which the selection fixing unit 700 is installed in the compressor of the present invention.

As described above, the rotating shaft 230 is rotatably supported by the fixed scroll 320 to orbit the orbiting scroll 330, and the orbiting scroll 330, the fixed scroll 320, and the main frame ( 310) a support shaft 232 including a supply passage 234 for delivering the oil to at least one, and extending from the oil storage space to the support shaft 232 to deliver the oil to the supply passage It includes an oil shaft 233 that is.

As the rotation shaft 230 is provided separately into the oil shaft 233 and the support shaft 232, the supply passage 234 and a first supply passage 2341 in the oil shaft 233, The support shaft 232 may be provided separately from the second supply passage 2342 in the interior.

The rotating shaft 230 may rotate in a first direction when a current is applied to the driving unit 200 , and the orbiting scroll 330 also revolves in the first direction while compressing the refrigerant together with the fixed scroll 320 . can do.

The selection fixing part 700 is provided between the support shaft 232 and the oil shaft 233 to block the support shaft 232 from rotating in a second direction opposite to the first direction. can be

The second direction is opposite to the direction in which the rotating shaft 230 rotates by the current of the driving unit 200 , and is opposite to the direction in which the orbiting scroll 330 compresses the refrigerant in the fixed scroll 320 . direction may be.

In addition, the first supply passage 2341 and the second supply passage 2342 may be provided to selectively communicate through the selection fixing unit 700 .

The selection fixing part 700 is provided with a shaft coupling part 710 coupled to the free end of the support shaft 232 and one end of the oil shaft 233 so as to be in contact with the shaft coupling part 710 . It may include a shaft fixing unit 720 .

The shaft fixing part 720 may be provided to allow the shaft coupling part 710 to rotate in the first direction, but to block rotation in the second direction.

Since the support shaft 232 is configured to rotate together with the rotor 220 , the shaft coupling part 710 is provided to rotate together when the support shaft 232 rotates. Since the oil shaft 233 is coupled to the fixed scroll 320 or the muffler 500 and is fixed not to rotate, the shaft fixing part 720 is provided not to rotate. Accordingly, when the shaft fixing part 720 is engaged with the shaft coupling part 710 , it is possible to prevent rotation of the shaft coupling part 710 .

However, the shaft fixing part 720 needs to be selectively separated from the shaft coupling part 710 in order to allow the rotation of the support shaft 232 . Accordingly, the shaft fixing part 720 may be selectively engaged with the shaft coupling part 710 or provided to be spaced apart from the shaft coupling part 710 .

The shaft fixing part 720 may be provided to reciprocate from the oil shaft 233 toward the support shaft 232 . To this end, the selection fixing part 700 is provided between the oil shaft 233 and the shaft fixing part 720 to move the shaft fixing part 720 to the shaft coupling part 710 , the elastic part 730 . may include

The elastic part 730 may press the shaft fixing part 720 with the shaft coupling part 710 to induce the shaft fixing part 720 and the shaft coupling part 710 to be in close contact with each other or to be engaged.

The shaft coupling part 710 may be provided to push the shaft fixing part 720 toward the elastic part 730 when it rotates in the first direction. However, when the shaft coupling part 710 rotates in the second direction, the shaft fixing part 720 may not be pushed toward the elastic part 730 or the oil shaft 233 .

On the other hand, the oil shaft 233 moves the shaft fixing part 720 close to or away from the shaft fixing part 720, and the shaft fixing part 720 so that the installation position of the shaft fixing part 720 is prevented from being changed. ) may be provided to support.

The oil shaft 233 may be provided to provide a space in which the shaft fixing part 720 and the elastic part 730 can be seated, and the shaft fixing part 720 is the shaft coupling part 710 as a reference. It may be provided to prevent twisting in the axial direction or changing the position.

The oil shaft 233 may extend to the oil storage space while accommodating at least a portion of the shaft fixing part 720 to provide a flow path through which oil moves to the supply flow path 234 provided in the support shaft 232 . .

The oil shaft 233 may include a compression coupling part 2331 that is spaced apart from the support shaft 232 and coupled to either the muffler 500 or the fixed scroll 320 .

The compression coupling part 2331 may be coupled to the muffler 500 in order to secure a space for accommodating the selection fixing part 700 .

The compression coupling part 2331 may be provided by being coupled to a region corresponding to the portion where the support shaft 232 is formed in the muffler 500 , and has a larger diameter than the support shaft 232 , so that the muffler It may be combined by being interviewed at 500 .

For example, the fixed scroll 320 may be provided with a fixed shaft portion 3281 for rotatably supporting the fixed support shaft 232c protruding downward from the fixed head plate 321, and the fixed shaft number The inner peripheral surface of the portion 3281 may include a fixed bearing 3282 for rotatably supporting the fixed support shaft 232c.

The muffler 500 may include a muffler shaft portion 540 having a space through which the support shaft 232 or the oil shaft 233 passes in the receiving body 510 .

The muffler shaft portion 540 may extend from the receiving body 510 to be coupled to the outer peripheral surface of the fixed shaft portion 3281 , and may be provided in a pipe shape.

A muffler sealing unit 550 for sealing the space between the muffler bearing unit 540 and the fixed bearing unit 3281 to prevent refrigerant leakage may be installed.

The compression coupling part 2331 may be coupled to the receiving body 510 provided on the outer circumferential surface of the muffler bearing part 540 . The compression coupling part 2331 may have a larger diameter than the muffler shaft part 540 . The compression coupling part 2331 may be provided in the shape of a disk or pipe having a hollow therein.

Accordingly, an installation space in which the selective fixing part 700 can be installed can be secured between the muffler shaft part 540 and the fixed shaft part 3281 and the compression coupling part 2331 .

The oil shaft 233 may be provided with a fixing support part 2332 provided on the inner circumferential surface of the compression coupling part 2331 so that the shaft fixing part 720 can be seated. The fixed support part 2332 may have a smaller diameter than the compression coupling part 2331 and may be provided in a ring or pipe shape exposed to the inside of the muffler bearing part 540 . Accordingly, the fixing support 2332 can form a support surface on which the selective fixing part 700 can be seated.

The fixed support part 2332 may be provided such that a part thereof is in contact with the inner peripheral surface of the muffler bearing part 540 . Accordingly, a region in which the oil shaft 233 is coupled to the muffler 500 can be easily determined.

Meanwhile, the oil shaft 233 may include an elastic support part 2333 extending from an inner circumferential surface of the fixed support part 2332 and having a smaller diameter than the fixed support part 2332 .

The elastic support part 2333 is provided in the shape of a ring or pipe having a hollow inside, so that a space in which a part of the installation fixing part 700 is inserted or accommodated can be secured. The elastic support part 2333 may extend stepwise in a direction away from the discharge part 121 from the fixed support part 2332 .

Accordingly, the elastic support part 2333 may form a support surface on which the elastic part 730 can be supported or seated. The elastic part 730 may be provided such that one end is seated on the elastic support part 2333 and the other end is in contact with or coupled to the shaft fixing part 720 . Accordingly, whenever the shaft fixing part 720 is pressed toward the elastic part 730, it is possible to provide a restoring force.

The shaft fixing part 720 may be provided to be supported by at least one of the fixing support part 2332 and the elastic support part 2333 .

The oil shaft 233 may include an oil extension portion 2334 provided to extend from the inner circumferential surface of the elastic support portion 2333 to the oil storage space. The oil extension part 2334 may be provided in a pipe shape.

All components of the oil shaft 233 may be integrally provided, and a flow path communicating with the hollow of the oil extension part 2334 may be provided. Accordingly, the oil flowing in from the oil extension part 2334 may be transferred to the support shaft 232c.

The oil shaft 233 may provide a space in which the selective fixing part 700 can be installed due to the compression coupling part 2331 , the fixed support part 2332 , and the elastic support part 2333 , and the support Although provided separately from the shaft 232c, it may be provided with the support shaft 232c, and may be provided to communicate with the supply passage 234 of the support shaft 232c.

Since the selection fixing part 700 is provided in the area where the existing rotation shaft 230 is installed, there is no need to secure a separate space for installing the selection fixing part 700 . Accordingly, the selection fixing unit 700 may be installed in the space occupied by the existing compression unit 300 or the muffler 500 , and the selection fixing unit 700 may be used interchangeably with the existing compressor 10 . have.

The shaft fixing part 720 includes a seating body 721 that is seated on the oil shaft 233, and extends from the seating body 721 toward the shaft coupling part 710 to rotate the shaft coupling part 710. It may include a rotation preventing portion 722 to block the.

The shaft coupling part 710 is coupled to the support shaft 232 and rotates together with the support shaft 232 , and the shaft body 711 is optional for the rotation prevention part 722 in the shaft body 711 . It may include a contact portion 712 provided to be fixed to.

The shaft coupling part 710 may be provided with an oil passage hole 713 provided to be able to communicate with the second supply passage 2342 through the shaft body 711 .

The contact part 712 may be provided extending from the shaft body 711 toward the oil shaft 233 .

When the shaft body 711 rotates in the first direction, the contact part 712 presses the surface of the rotation prevention part 722 to push the shaft fixing part 720 in the oil shaft 233 direction. can be Accordingly, the shaft coupling portion 710 may continue to rotate in the first direction without being fixed to the rotation preventing portion 722 .

However, when the shaft body 711 rotates in the second direction, the contact part 712 may be provided to engage the rotation preventing part 722 . Accordingly, the shaft coupling part 710 is fixed to the rotation preventing part 722, and rotation in the second direction can be prevented.

The shaft coupling part 711 and the shaft fixing part 720 may be provided in a one-way clutch structure.

Meanwhile, the elastic part 730 may be provided as a ring-shaped spring. However, it may be provided in the form of a leaf spring that can be easily installed while buffering the impact of the shaft fixing part 720 and quickly restoring the position.

A part of the elastic part 730 may be accommodated in the shaft fixing part 720 and disposed symmetrically to the seating body 721 .

4 shows a detailed structure of the selection fixing unit 700 .

The selection fixing part 700 may be provided such that the shaft coupling part 710 and the shaft fixing part 720 are selectively engaged.

Specifically, the shaft coupling part 710 may be provided with a docking part 714 that extends from the shaft body 711 and is partially inserted into the shaft fixing part 720 to be seated, and the docking part ( An oil communication hole 713 provided to communicate with the second supply passage 2342 may be provided inside the 714 .

The docking part 714 may extend from the shaft body 711 longer than the contact part 712 , so that a state in which a part of the docking part 714 is always inserted into the shaft fixing part 720 may be maintained.

The docking part 714 may act as a rotation center of the shaft coupling part 710 . That is, the docking unit 714 may determine the rotation center at which the shaft coupling unit 710 is rotated in the shaft fixing unit 720 .

Accordingly, even if the distance between the shaft coupling part 710 and the shaft fixing part 720 is different, it is possible to prevent the relative positions of the shaft coupling part 710 and the shaft fixing part 720 from being changed. In other words, the shaft coupling part 710 and the shaft fixing part 720 can be prevented from being twisted in the axial direction.

On the other hand, the contact part 712 may be provided to extend downward from the outer peripheral surface of the docking part 714 and the inner peripheral surface of the shaft body 711 . The contact part 712 includes a stopper 7121 that presses the rotation prevention part 722 or is fixed to the rotation prevention part 722, and the shaft body 711 in the first direction from the stopping jaw 7121. ) extending obliquely to the anti-rotation part 722 may include a slidable inclined surface 7122.

The shaft fixing part 720 may include a supply hole 723 provided through the seating body 721 so that the docking part 714 can be accommodated and seated. The rotation preventing part 722 may be provided extending from the outer circumferential surface of the supply hole 723 toward the contact part 712 , and correspond to the shape of the contact part 712 so as to be engaged with the contact part 712 . It may be provided in a shape that becomes

The rotation preventing unit 722 may include a fixed jaw 7221 that can be fixed by being in contact with the contact unit 712 and a contact surface 7222 extending from the fixed jaw to the seating body 721 in the second direction. can The contact surface 7222 may be provided with the same inclination to be completely in surface contact with the inclined surface 7122 , and may be provided to slide with the inclined surface 7122 .

When the shaft body 711 rotates in the first direction, the contact portion 712 is provided to continuously slide the other rotation prevention portion 722 adjacent thereto while sliding any one rotation prevention portion 722. can

However, in the contact portion 712, when the shaft body 711 rotates in the second direction, the inclined surface 7122 slides the contact surface 7222 of any one of the rotation preventing portions 722, but the other adjacent thereto The stopping jaw 7121 may be fixed to the fixing jaw 7221 of one rotation preventing part 722 . Accordingly, the contact portion 712 may be fixed without moving to the other rotation preventing portion 722 .

In this case, the elastic part 730 may push the shaft fixing part 720 to the shaft coupling part 710 to bring the inclined surface 7122 and the contact surface 7222 into close contact.

The shaft fixing part 720 may include an installation groove 724 which is recessed in the seating body 721 to accommodate the elastic part 720 . The installation groove 724 has an open surface facing the oil shaft 233 from the seating body 721 to accommodate the elastic part 720, and part of the outer circumferential surface of the seating body 721 is removed. It may be provided to open. Accordingly, it can be prevented that a part of the elastic part 720 is exposed or that the elastic part 720 is limited to the diameter of the seating body 721 .

On the other hand, the shaft fixing part 720 may further include a mounting base 725 capable of being seated on the fixed body 2332 . The mounting base 725 may be provided between the installation groove 724 and the rotation preventing part 721 . The seating base 725 may be provided in a form in which the installation groove 724 in the seating body 721 opens the seating body 721 . In addition, one end of the installation groove 724 may be provided to extend further than the outer circumferential surface of the seating body 721 .

5 shows an operation method of the installation fixing unit 700 .

Referring to FIG. 5A , when power is applied to the driving unit 200 , the support shaft 232 may rotate in a first direction. At this time, the shaft coupling part 710 may also rotate in the first direction together with the support shaft 232 .

At this time, the contact portion 712 of the shaft coupling portion 710 may be provided to slide the rotation preventing portion 722 of the shaft fixing portion 720 .

Specifically, the stopper 7121 of the contact part 712 slides along the contact surface 7222 of the plurality of rotation prevention parts 722, and the shaft fixing part 720 moves in the direction in which the elastic part 730 is installed. can be pressurized.

The shaft fixing part 720 is spaced apart from the shaft coupling part 710 when the fixing jaw 7221 is pressed against the stopping jaw 7121, and the fixing jaw 7221 is one end of the contact surface 7222. When in contact with , it may be disposed closest to the shaft coupling portion 710 .

As the stopper 7121 periodically pushes the shaft fixing part 720 , the interval between the shaft fixing part 720 and the shaft coupling part 710 may be periodically increased.

On the other hand, as the rotation shaft 230 rotates in the first direction, a high pressure is formed in the supply passage 234 , and an intermediate pressure region lower than the high pressure is formed between the orbit wrap 333 and the fixed wrap 323 . Alternatively, a low pressure region is formed to generate a pressure difference. Accordingly, the oil in the oil shaft 233 rises along the first supply passage 234 and follows the oil through hole 713 in the shaft coupling part 710 to the second supply passage 2342 . can be transmitted to

Referring to FIG. 5( b ), when the rotation of the rotation shaft 230 is stopped, the refrigerant in the orbit wrap 333 and the fixed wrap 323 may start to expand, and the support shaft 232C. can be rotated in the second direction. Accordingly, the shaft coupling part 710 is the second until the stopping jaw 7121 of the contact part 712 reaches the fixing jaw 7221 along the contact surface 7222 of the rotation preventing part 722 . direction can be rotated.

When the stopping jaw 7121 is in contact with the fixing jaw 7221 , the stopping jaw 7121 cannot push the fixing jaw 7221 in the direction in which the elastic part 730 is disposed. Furthermore, since the elastic part 730 presses the shaft fixing part 720 to the shaft coupling part 710 , the shaft coupling part 710 may be fixed to the shaft fixing part 720 .

As a result, rotation of the orbiting scroll 330 and the support shaft 232 in the second direction can be stopped, and pressure change does not occur between the orbiting wrap 333 and the fixed wrap 323. Backflow of oil can be blocked.

In other words, when the shaft coupling part 710 rotates in the second direction, the elastic part 730 may move the shaft fixing part 720 to the shaft coupling part 710 to induce them to engage with each other. As a result, the shaft coupling part 710 rotates only in the first direction and can be prevented from rotating in the second direction.

As a result, the support shaft 232 and the orbiting scroll 330 that rotate together with the shaft coupling part 710 rotate only in the first direction and can be prevented from rotating in the second direction. Therefore, even if negative pressure is generated inside the orbiting scroll 330 and the fixed scroll 320 or the refrigerant generates a force to expand, the orbiting scroll 330 may be blocked from rotating in the second direction. have. Therefore, the reverse flow of oil in the orbiting scroll 330 and the fixed scroll 320 to the supply passage 234 provided in the rotating shaft 230 can be blocked.

6 shows another embodiment of the installation fixing unit 700 of the present invention.

Hereinafter, points different from the above-described embodiments will be mainly described in order to avoid overlapping descriptions.

The shaft coupling part 710 may include a receiving groove 727 in which the docking part 714 is accommodated in the seating body 721 .

The accommodating groove 727 may be provided with a diameter corresponding to the diameter of the docking part 714, and is recessed into the seating body 721 to have a length equal to or deeper than that of the dotting part 714. can be

The accommodating groove 727 may be provided to receive the docking part 714 on the inner circumferential surface of the rotation preventing part 722 . The receiving groove 727 may be provided so that oil does not pass therethrough. Accordingly, it is possible to block the passage of oil through the receiving groove (727).

The seating body 721 may include a blocking surface 726 on an exposed surface corresponding to the receiving groove 727 . The blocking surface 726 may prevent a through hole from being formed in the receiving groove 727 , and may be provided to block the oil from penetrating the seating body 721 .

The installation groove 724 may be provided symmetrically with respect to the blocking surface 726 .

Accordingly, when the shaft fixing part 720 is engaged with the shaft coupling part 710, the docking part 714 is inserted into the receiving groove 727, and the oil through hole 713 of the docking part 714 is exposure is blocked. In addition, when the contact surface 722 and the inclined surface 712 are in surface contact, oil may be blocked from being introduced or discharged between the shaft fixing part 720 and the shaft coupling part 710 .

As a result, the shaft coupling part 710 is fixed to the shaft fixing part 720 to prevent the rotation shaft 230 from rotating in the second direction, and the second supply passage 2342 is completely sealed to prevent the compression. Backflow of oil in the portion 300 can be prevented.

FIG. 7 shows an operating embodiment of the installation fixing unit 700 shown in FIG. 6 .

Referring to FIG. 7A , when power is applied to the driving unit 200 , the support shaft 232 may rotate in a first direction. At this time, the shaft coupling part 710 may also rotate in the first direction together with the support shaft 232 .

At this time, the contact portion 712 of the shaft coupling portion 710 may be provided to slide the rotation preventing portion 722 of the shaft fixing portion 720 .

Specifically, the stopper 7121 of the contact part 712 slides along the contact surface 7222 of the plurality of rotation prevention parts 722, and the shaft fixing part 720 moves in the direction in which the elastic part 730 is installed. can be pressurized.

The shaft fixing part 720 is spaced apart from the shaft coupling part 710 when the fixing jaw 7221 is pressed against the stopping jaw 7121, and the fixing jaw 7221 is one end of the contact surface 7222. When in contact with , it may be disposed closest to the shaft coupling portion 710 .

As the stopper 7121 periodically pushes the shaft fixing part 720 , the interval between the shaft fixing part 720 and the shaft coupling part 710 may be periodically increased.

On the other hand, as the rotation shaft 230 rotates in the first direction, a high pressure is formed in the supply passage 234 , and an intermediate pressure region lower than the high pressure is formed between the orbit wrap 333 and the fixed wrap 323 . Alternatively, a low pressure region is formed to generate a pressure difference.

Accordingly, the oil in the oil shaft 233 rises along the first supply passage 234 , but does not penetrate the seating body 721 by the blocking wall 725 of the shaft fixing part 720 . . Accordingly, it can move along one surface of the installation groove 724 or the seating body 721 and move to the shaft coupling part 710 . The oil that has reached the shaft coupling part 710 may be supplied to the second supply passage 2342 .

Since the shaft fixing part 720 generates flow resistance when the oil passes, it can serve as a pressure reducing pin. Accordingly, it is possible to prevent the oil from being excessively supplied to the compression unit 300 .

Referring to FIG. 5( b ), when the rotation of the rotation shaft 230 is stopped, the refrigerant in the orbit wrap 333 and the fixed wrap 323 may start to expand, and the support shaft 232C. can be rotated in the second direction. Accordingly, the shaft coupling part 710 is the second until the stopping jaw 7121 of the contact part 712 reaches the fixing jaw 7221 along the contact surface 7222 of the rotation preventing part 722 . direction can be rotated.

When the stopping jaw 7121 is in contact with the fixing jaw 7221 , the stopping jaw 7121 cannot push the fixing jaw 7221 in the direction in which the elastic part 730 is disposed. Furthermore, since the elastic part 730 presses the shaft fixing part 720 to the shaft coupling part 710 , the shaft coupling part 710 may be fixed to the shaft fixing part 720 .

At this time, the shaft coupling part 710 and the shaft fixing part 720 may be in close contact with each other. That is, the docking part 714 is accommodated in the receiving groove 727 so that the oil through hole 713 can be closed, and the rotation preventing part 722 and the protruding part 712 come into contact with each other so that the shaft A gap between the coupling part 710 and the shaft fixing part 720 may be sealed.

Specifically, the contact surface 7222 and the inclined surface 7122 may be in contact with each other to seal a gap between the shaft coupling part 710 and the shaft fixing part 720 .

Accordingly, rotation of the orbiting scroll 330 and the support shaft 232 in the second direction may be stopped. In addition, since the inflow of oil between the shaft coupling portion 710 and the shaft fixing portion 720 is completely blocked, the oil in the oil shaft 233 cannot flow into the second supply passage 2342 as well as , the oil inside the compression unit 300 may not flow back into the second supply passage 2342 .

As a result, it is possible to prevent the oil located in the turning wrap 333 and the fixed wrap 323 from flowing back into the oil storage space again.

The compressor 10 of the present invention not only blocks the rotation of the orbiting scroll 330 in the second direction through the selection fixing part 700, but also that the oil inside the compression part 300 flows back into the oil storage space. can block it

Furthermore, the selection fixing unit 700 can be operated mechanically and physically semi-permanently without separate electrical control. In addition, since the selection fixing part 700 is installed in the area occupied by the compression part 300, there is no need to secure a separate installation space.

8 is a view showing the operation of the compressor of the present invention.

Fig. 8(a) shows the orbiting scroll, Fig. 8(b) shows the fixed scroll, and Fig. 8(c) shows the process in which the orbiting scroll and the fixed scroll compress the refrigerant.

The orbiting scroll 330 may include an orbiting wrap 333 on one surface of the orbiting mirror plate 331 , and the fixed scroll 320 includes the fixed lap 323 on one surface of the fixed head plate 321 . can be provided

In addition, the orbiting scroll 330 is provided with a sealed rigid body to prevent the refrigerant from being discharged to the outside, but the fixed scroll 320 has a suction port 325 communicating with the refrigerant supply pipe so that a low-temperature, low-pressure refrigerant such as liquid is introduced. ) and a discharge port 326 through which the high-temperature and high-pressure refrigerant is discharged, and a bypass hole 327 through which the refrigerant discharged from the discharge port 326 is discharged on an outer peripheral surface thereof.

Meanwhile, the fixed wrap 323 and the orbit wrap 333 may be provided in an involute shape to form a compression chamber in which at least two points are engaged while the refrigerant is compressed.

The involute shape means a curve corresponding to the trajectory drawn by the end of the thread when unwinding the thread wound around the base circle having an arbitrary radius as shown.

However, in the present invention, the fixed wrap 323 and the orbit wrap 333 are formed by combining 20 or more arcs, and may be provided so that the radius of curvature varies for each part.

That is, in the compressor of the present invention, the rotating shaft 230 is provided to pass through the fixed scroll 320 and the orbiting scroll 330, so that the radius of curvature and the compression space of the fixed lap 323 and the orbiting lap 333 are decreases.

Therefore, in order to compensate for this, the compressor of the present invention reduces the space through which the refrigerant is discharged and improves the compression ratio, so that the radius of curvature just before the discharge of the fixed wrap 323 and the orbit wrap 333 passes through the rotation shaft. It can be provided in a smaller size than the shaft bearing part.

That is, the fixed wrap 323 and the orbital wrap 333 may be bent more severely in the vicinity of the discharge port 326, and as it extends to the suction port 325, the radius of curvature corresponds to the bent portion at each point. may vary.

Referring to FIG. 8( c ), the refrigerant (I) flows into the suction port 325 of the fixed scroll 320, and the refrigerant (II) introduced before the refrigerant (I) is the fixed scroll (320). It is located in the vicinity of the discharge port 326 .

At this time, the refrigerant (I) is present in a region provided in engagement with each other on the outer surfaces of the fixed wrap 323 and the orbiting wrap 333, and the refrigerant (II) is the fixed wrap 323 and the orbiting wrap. (333) exists sealed in another region where two points interlock.

Afterwards, when the orbiting scroll 330 starts a pivoting motion, the fixed lap 323 and the orbiting lap 333 two-point meshing area according to the change of the position of the orbiting lap 333 is the fixed lap 323. And while moving along the extending direction of the orbiting wrap 333, the volume begins to decrease, and the refrigerant (I) moves and begins to be compressed. The refrigerant (II) is further reduced in volume, compressed, and begins to be guided to the discharge port (326).

The refrigerant (II) is discharged from the discharge port 326, and the refrigerant (I) moves as the two-point meshing area between the fixed wrap 323 and the orbiting wrap 333 moves in a clockwise direction, As the volume decreases, it begins to compress further.

The area where the fixed wrap 323 and the orbiting wrap 333 are engaged at two points moves clockwise again and approaches the inside of the fixed scroll, the volume is further reduced and compressed, and the refrigerant (II) is almost discharged. is done

As such, as the orbiting scroll 330 orbits, the refrigerant may be compressed linearly or continuously while moving inside the fixed scroll.

Although the figure shows that the refrigerant is discontinuously introduced into the suction port 325, this is for illustrative purposes only and the refrigerant may be continuously supplied, and the fixed wrap 323 and the orbiting wrap 333 are Refrigerant may be accommodated and compressed in each area where the two points are engaged.

The present invention may be modified and implemented in various forms, but the scope of the rights is not limited to the above-described embodiments. Therefore, if the modified embodiment includes the elements of the claims of the present invention, it should be regarded as belonging to the scope of the present invention.

10 Compressor
200 drive
300 compressor
500 muffler
700 selection fixing part
710 shaft coupling
720 fixed government

Claims (15)

a case having a discharge unit through which the refrigerant is discharged, and a storage space in which oil is stored;
a driving unit coupled to the inner circumferential surface of the case;
a rotating shaft coupled to the driving unit to rotate;
a compression unit coupled to the rotation shaft to compress the refrigerant; and
the compression unit
an orbiting scroll coupled to the rotating shaft and provided to orbitally move in a first direction when the rotating shaft rotates;
a fixed scroll provided in engagement with the orbiting scroll to receive the refrigerant and compress and discharge the refrigerant;
A main frame seated on the fixed scroll to accommodate the orbiting scroll and through which the rotating shaft passes; including,
The rotation axis is
a support shaft rotatably supported by the fixed scroll to make the orbiting scroll orbit, and a support shaft including a supply passage for delivering the oil to at least one of the orbiting scroll, the fixed scroll, and the main frame;
an oil shaft extending from the oil storage space to the support shaft and provided to deliver the oil to the supply passage;
A selection fixing part provided between the support shaft and the oil shaft to block rotation of the support shaft in a second direction opposite to the first direction,
The selection fixing unit
a shaft coupling portion coupled to the free end of the support shaft and including an oil passage hole communicating with the supply passage;
and a shaft fixing part provided at one end of the oil shaft to be in contact with the shaft coupling part, allowing the shaft coupling part to rotate in the first direction, but blocking rotation in the second direction. delete According to claim 1,
The selection fixing unit
and an elastic part provided between the oil shaft and the shaft fixing part to move the shaft fixing part to the shaft coupling part. 4. The method of claim 3,
The shaft fixing unit
a seating body mounted on the oil shaft;
and a rotation preventing part extending from the seating body toward the shaft coupling part to block the rotation of the shaft coupling part,
The shaft coupling part
A compressor comprising: a shaft body coupled to the support shaft and rotating together with the support shaft; and a contact part provided to be selectively fixed to the rotation preventing part in the shaft body. 5. The method of claim 4,
the contact part
A compressor comprising: a stopper provided to be fixed to the anti-rotation part; 6. The method of claim 5,
The oil passage hole passes through the shaft body and communicates with the supply passage. 7. The method of claim 6,
The shaft coupling part
and a docking part extending from the shaft body to be seated on the shaft fixing part, the oil passage hole being provided, and a docking part determining the rotation center of the contact part. 8. The method of claim 7,
The shaft fixing unit
The compressor is provided through the seating body so that the docking part is inserted and seated and includes a supply hole through which the oil of the oil shaft can be introduced. 8. The method of claim 7,
The shaft fixing unit
and a receiving groove recessed in the seating body so that the docking part is inserted and seated. 10. The method of claim 9,
The shaft fixing unit
and an installation groove provided to receive and seat the elastic part at a lower end of the seating body. 11. The method of claim 10,
The shaft fixing unit
and a pedestal provided between the installation groove and the anti-rotation part to be seated on the oil shaft. 11. The method of claim 10,
The anti-rotation part
a fixed jaw extending from the seating body to be in contact with the stopping jaw;
and a contact surface extending from the fixed jaw to the seating body in the second direction so that the inclined surface is slidably provided. 13. The method of claim 12,
The elastic part
Compressor, characterized in that for pressing the seating body so that the inclined surface and the contact surface are in close contact. 14. The method of claim 13,
Compressor, characterized in that the inclined surface and the contact surface are provided in close contact with the oil supplied from the oil shaft to block the passage. 11. The method of claim 10,
a muffler coupled in a direction away from the discharge unit in the fixed scroll to guide the refrigerant discharged from the fixed scroll to the discharge unit, the muffler being provided through the support shaft;
The oil shaft is
a compression coupling part coupled to any one of the muffler or the fixed scroll while being spaced apart from the support shaft;
a fixed support portion provided to allow the seating body to be seated on the inner circumferential surface of the compression coupling portion;
an elastic support portion extending stepwise from the inner circumferential surface of the fixed support portion to face the installation groove and provided so that the elastic portion is seated;
and an oil extension part provided to extend from the inner circumferential surface of the elastic support part to the oil storage space.

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