Scroll compressor

Abstract

A scroll compressor is disclosed. The scroll compressor according to an embodiment of the present invention can reduce vibration noise generated according to the discharge of a refrigerant, through a structural change of a rear housing.

Description

scroll compressor

[0001] The present invention relates to reducing vibration noise generated in a rear housing, and more particularly to a scroll compressor.

[0002] Typically, vehicle air conditioning systems consist of a compressor, a condenser, an expansion valve, and an evaporator. The compressor compresses the refrigerant gas discharged from the evaporator into a high-temperature, high-pressure state that facilitates liquefaction and then delivers it to the condenser. The compressor also pumps and recirculates the refrigerant to ensure continuous cooling.

[0003] The condenser cools the high-temperature, high-pressure refrigerant gas by exchanging heat with the outside air, thereby liquefying it, and the expansion valve adiabatically expands the liquid refrigerant, thereby lowering its temperature and pressure, making it easy to evaporate in the evaporator.

[0004] The evaporator absorbs heat from the liquid refrigerant and vaporizes it by exchanging heat with the outside air introduced into the vehicle. The outside air is cooled by the refrigerant, and is then blown into the vehicle's interior by a blower.

[0005] Compressors are of two types: a reciprocating type, which compresses the working fluid (refrigerant) by reciprocating motion, and a rotary type, which compresses it by rotating motion. Among the reciprocating types, there are a crank type, which transmits the driving force of a driving source to multiple pistons using a crank, a swash plate type, which transmits the force to a rotating shaft on which a swash plate is installed, and a wobble plate type, which uses a wobble plate.

[0006] For example, a scroll compressor is a type of rotary compressor in which compression is achieved by two interlocking scrolls with involute teeth moving in a linear motion.

[0007] The above scroll compressor operates by having a rotating scroll and a fixed scroll that have a geometrical phase difference of 180 degrees relative to each other and rotate inside the discharge chamber, and the rotating scroll and the fixed scroll have scroll-shaped wings (wraps), and the wings are formed as involute curves having the same shape.

[0008] A scroll compressor forms a crescent-shaped compression chamber through the engagement of a rotating scroll and a fixed scroll, thereby completing a compression cycle. The compression chamber is formed such that its volume increases toward the outside and decreases toward the center. A suction chamber is formed on the outside and a discharge port is formed in the center.

[0009] In the above scroll compressor, compression is performed by sealing suction gas within a sealed space of a given volume around the outer periphery of the scroll and the relative rotation of the scroll gradually reducing the size of the compression space toward the discharge port and discharging it through the discharge port.

[0010] The refrigerant discharged from the above discharge chamber passes through the oil separation tube and is centrifugally separated before finally being discharged through the discharge port. The centrifugal separation of oil can be stably achieved only when the refrigerant rotates stably.

[0011] Referring to the attached drawing 1, in a conventional scroll compressor, considerable pressure is applied to the rear head (2) in which a discharge chamber is formed due to pressure fluctuations resulting from the discharge of refrigerant, which causes radiated noise due to vibration.

[0012] The above conventional rear head (2) does not have a structure that can reduce vibration noise caused by the pressure of the discharged refrigerant, so a countermeasure for this became necessary.

[0013] Embodiments of the present invention aim to provide a scroll compressor that reduces vibration noise caused by shaking due to high-pressure refrigerant discharge by changing the structure of the rear housing.

[0014] A scroll compressor according to one embodiment of the present invention comprises: a housing (30); a compression unit (5) provided within the housing (30); a driving unit (3) provided within the housing (30) to drive the compression unit (5); the compression unit includes a fixed scroll and a rotating scroll that rotates relative to the fixed scroll, and refrigerant compressed in the compression unit is discharged to a discharge chamber unit formed in a rear housing through a discharge hole formed in the fixed scroll, and a curved portion is formed in the discharge chamber unit such that a surface facing the discharge hole is rounded inward.

[0015] The above-mentioned curved portion includes a first curved portion that is curved with a first curvature toward the inside of the rear housing from the upper side based on a curved vertex that is curved with a predetermined curvature; and a second curved portion that is curved with a second curvature toward the inside of the rear housing based on the curved vertex.

[0016] When the refrigerant is discharged into the discharge chamber through the discharge hole, it comes into first contact with the second curved portion, and after oil separation occurs, the oil moves downward in the direction of gravity (G).

[0017] The above curved peak is formed above the discharge hole in the direction of gravity (G).

[0018] The above discharge chamber portion further includes a first chamber formed with a predetermined volume; a second chamber having an independent space via an internal partition wall from the first chamber; and a communication hole connecting the first chamber and the second chamber.

[0019] The first chamber has a larger area than the second chamber.

[0020] In the second chamber, an oil storage chamber is formed with a predetermined size toward the direction of gravity (G).

[0021] The above inner bulkhead extends obliquely toward the oil storage chamber.

[0022] The above rear housing is formed with a protrusion that protrudes toward a position facing the discharge hole.

[0023] The above protrusion includes a first protrusion formed on the curved portion; and a second protrusion disposed on the lower side of the first protrusion in the direction of gravity (G).

[0024] The first protrusion and the second protrusion are formed in plurality, and the number of the first protrusions is greater than the number of the second protrusions.

[0025] The above protrusion extends toward the direction of gravity (G) at a predetermined angle from the rear housing.

[0026] In the above rear housing, an oil separator for separating oil contained in the refrigerant is arranged at an angle with respect to the curved portion.

[0027] Embodiments of the present invention can reduce the occurrence of vibration and noise that occur in an environment where high-pressure refrigerant is discharged by changing the structure of the rear housing.

[0028] Embodiments of the present invention can simultaneously perform vibration noise reduction and oil separation functions according to refrigerant discharge, thereby increasing performance.

[0029] Embodiments of the present invention can easily perform oil recovery through structural changes in the rear housing.

[0030] Embodiments of the present invention can reduce manufacturing costs and process time by forming an oil separation structure in the rear housing through die casting without requiring separate processing or assembling additional devices in the rear housing.

[0031] Embodiments of the present invention can greatly increase oil separation performance compared to the prior art when an oil separator is additionally provided together with a curved section.

[0032]

[0033] Fig. 1 is a longitudinal cross-sectional view showing the noise condition generated in the rear housing equipped in a conventional scroll compressor.

[0034] Fig. 2 is a longitudinal cross-sectional view illustrating a conventional scroll compressor.

[0035] Figure 3 is a perspective view showing a rear housing according to the present embodiment.

[0036] Figure 4 is a perspective view of the outer surface of the rear housing according to the present embodiment.

[0037] Fig. 5 is a longitudinal cross-sectional view of a rear housing according to the present embodiment.

[0038] Figure 6 is a perspective view showing a rear housing according to another embodiment of the present invention.

[0039] FIG. 7 is a perspective view illustrating another embodiment of the present invention in which an oil separator is included with a curved portion in the rear housing.

[0040] The advantages and features of the present disclosure, and methods for achieving them, will become clearer with reference to the embodiments described below in detail with the accompanying drawings. However, the present disclosure is not limited to the embodiments disclosed below, but may be implemented in various different forms. These embodiments are provided solely to ensure that the disclosure is complete and to fully inform those skilled in the art of the scope of the disclosure, and the present disclosure is defined solely by the scope of the claims. Like reference numerals designate like elements throughout the specification.

[0041] When one component is referred to as being "connected to" or "coupled to" another component, it includes both cases where it is directly connected or coupled to the other component, or where there is another component intervening therebetween. Conversely, when one component is referred to as being "directly connected to" or "directly coupled to" another component, it indicates that there is no other component intervening therebetween. "And / or" includes each and any combination of one or more of the mentioned items.

[0042] The terminology used herein is for the purpose of describing embodiments only and is not intended to be limiting of the present disclosure. As used herein, the singular includes the plural unless the context clearly dictates otherwise. As used herein, the terms "comprises" and / or "comprising" do not exclude the presence or addition of one or more other components, steps, operations, and / or elements.

[0043] Although terms like "first," "second," etc. are used to describe various components, these components are not limited by these terms. These terms are used only to distinguish one component from another.

[0044]

[0045] The conventional scroll compressor (1) illustrated in FIG. 2 is mostly similar to the main configuration of the present embodiment and differs only in the internal structure of the rear housing (100), so it is first described for the purpose of understanding the structure before describing the detailed structure of the rear housing (100).

[0046] The scroll compressor (1) is provided with a stator (90) on the inside of the driving unit (3), and the driving unit (3) corresponds to a driving source that creates rotational power of the scroll compressor (1) for compressing refrigerant.

[0047] The above driving unit (3) is composed of a housing (30) forming an outer shape, a stator (90) fixed within the housing (30), and a rotor (41) rotating within the stator (90).

[0048] The above housing (30) is formed in a cylindrical shape as a part forming the outer shape of the driving unit (3), and is composed of a front housing (32) that supports the front end portion of the rotor (41) and a rear housing (31) that supports the rear end portion of the rotor (41).

[0049] The above stator (90) is an electromagnet that creates a rotational driving force together with a rotor (41) that is coaxially mounted on the inside, and is composed of a stator core that is fixedly mounted on the inner surface of the housing (30) by press-fitting or the like, and a stator coil (92) that is wound around the stator core.

[0050] The above stator core is a hollow cylindrical member, and a hole is formed on the central axis through which a rotor (41) is inserted.

[0051] In addition, the rotor (41) is a part that is coaxially mounted on the inside of the stator (90) and rotates, and is rotatably inserted into a hole in the center of the stator core of the stator (90).

[0052] In the above rotor (41), a rotation shaft (37) is inserted along the central axis, and a rotor core (39) is coupled to the outer surface of the rotation shaft (37). When the stator (90) is excited, the rotor (41) is rotated by the interaction of the stator (90) according to the driving principle of the motor, and the rotation shaft (37) is rotatably supported in the housing (30) through bearings (81, 82).

[0053] The above compression unit (5) is a unit that compresses the refrigerant by rotating by the rotational driving force generated from the driving unit (3), and includes a rotating scroll (53) and the above

[0054] It is composed of a rotating scroll (53) and a fixed scroll (50) that is rotatably engaged.

[0055] The above compression unit (5) is a cylindrical body open toward the driving unit (3) and is configured to discharge compressed gaseous refrigerant through a discharge port (11) opened on one side.

[0056] The above-mentioned orbiting scroll (53) has a spiral-shaped orbiting scroll wrap (59) protrudingly formed at the rear so as to converge toward the center, and an eccentric shaft (38) of the rotational shaft (37) of the driving unit (3) is coupled to the center of the orbiting scroll wrap (59), so as to revolve synchronously with the rotor (41) around the rotational shaft (37).

[0057] The above fixed scroll (50) is configured to form a compression chamber (54) between itself and the orbiting scroll (53), and the fixed scroll wrap (61) is arranged to converge toward the center and is curved in a spiral shape to align with the scroll wrap (59) of the orbiting scroll (53).

[0058] When the orbiting scroll (53) rotates, the mutually aligned orbiting scroll (53) and fixed scroll (50) compress the refrigerant sucked from the drive unit (3) to the outer edge of the orbiting and fixed scroll wrap (59, 61) into the center and then discharge it in a high-pressure state through the interaction of the orbiting and fixed scroll wrap (59, 61).

[0059]

[0060] Referring to the attached drawings 3 to 6, the compression unit (5) includes a fixed scroll and a rotating scroll that rotates relative to the fixed scroll, and the refrigerant compressed in the compression unit (5) is discharged to a discharge chamber unit (110) formed in the rear housing through a discharge hole (52) formed in the fixed scroll, and a curved portion (120) is formed in the discharge chamber unit (110) such that the opposite surface facing the discharge hole (52) is rounded inward.

[0061] The curved portion (120) according to the present embodiment includes a first curved portion (120a) that is curved with a first curvature toward the inside of the rear housing (100) from the upper side based on a curved vertex (121) that is curved with a predetermined curvature, and a second curved portion (120b) that is curved with a second curvature toward the inside of the rear housing (100) based on the curved vertex (121).

[0062] The curved portion (120) according to the present embodiment is formed to be rounded at a predetermined curvature toward the inside when looking at the rear housing (100) from the outside and is manufactured by a casting method.

[0063] In particular, the curved portion (120) is roundly protruded toward the inside of the rear housing (100) to prevent the generation of radiated noise due to vibration when high-pressure refrigerant is discharged into the discharge chamber (110), so that even when high-pressure refrigerant is discharged into the discharge chamber (110), radiated noise due to vibration is reduced.

[0064] Since the above rear housing (100) is formed as an empty space with a discharge chamber portion (110) of a predetermined size, vibration is reduced or dispersed according to the round shape of the curved portion (120), which is more advantageous in reducing the total noise generated throughout the scroll compressor.

[0065] In addition, the above-mentioned curved portion (120) protrudes in a round shape toward the discharge hole (52) to improve the separation efficiency for oil contained in the refrigerant, so that when the refrigerant is discharged to the discharge chamber portion (110), a movement path that necessarily contacts the above-mentioned curved portion (120) is maintained.

[0066] For example, the above-mentioned curved portion (120) has a first curved portion (120a) that is rounded with a curvature as shown in FIG. 5 and extends upward based on the curved vertex (121), and a second curved portion (120b) that extends downward in the direction of gravity based on the curved vertex (121) as shown in the drawing.

[0067] The above-mentioned curved portion (120) is formed to be rounded toward the inside of the rear housing (100) as shown in FIG. 5, and the position where the virtual dotted lines perpendicular to the axial direction meet corresponds to the curved vertex (121).

[0068] The above curved peak (121) is configured to be formed higher in the direction of gravity (G) than the discharge hole (52).

[0069] In this case, when the refrigerant is discharged into the discharge chamber (110), it comes into contact with the second curved portion (120b) formed on the lower side based on the curved peak (121), thereby promoting the diffusion movement of the refrigerant and oil separation efficiency.

[0070] In addition, when the second curved portion (120b) is extended in this manner, when the refrigerant is discharged to the discharge chamber portion (110), the oil in the liquid state can move toward the direction of gravity (G) by first contacting the second curved portion (120b), thereby improving the oil separation efficiency.

[0071]

[0072] The above discharge chamber part (110) further includes a first chamber (112) formed with a predetermined volume, a second chamber (114) having an independent space via the first chamber (112) and an internal partition wall (102), and a communication hole (116) connecting the first chamber (112) and the second chamber (114).

[0073] The first chamber (112) is formed with a larger area than the second chamber (114), and is formed with a larger area than the second chamber (114) to provide a space in which high-pressure refrigerant is discharged and diffused simultaneously, thereby suppressing the occurrence of vibration due to refrigerant discharge.

[0074] The first chamber (112) above has the curved portion (120) formed therein, which corresponds to a space where diffusion, movement, and separation of the refrigerant all occur simultaneously.

[0075]

[0076] The second chamber (114) is located below the first chamber (112) and provides a space for recovering and storing oil contained in the refrigerant. An oil storage chamber (114a) having a predetermined size and formed toward the direction of gravity (G) is formed in the second chamber (114). The oil storage chamber (114a) is formed to be concave toward the direction of gravity (G) based on the drawing, but may be variously changed into other shapes.

[0077]

[0078] The above inner bulkhead (102) extends obliquely toward the oil storage chamber (114a). The above inner bulkhead (102) extends obliquely downward toward the communication hole (116) at positions on the left and right sides of the drawing with respect to the communication hole (116).

[0079] The above internal bulkhead (102) is extended in an inclined manner toward the communication hole (116) to ensure stable movement of the separated oil after the refrigerant collides with the curved portion (120), so that the oil can be stably moved toward the oil storage chamber (114a), making it easy to move and store the separated oil.

[0080] The above communication hole (116) may be formed in a circular or oval shape, and may be formed in one or more.

[0081]

[0082] Referring to the attached drawing 6, the rear housing (100) according to the present embodiment is formed with a protrusion (130) that protrudes toward a position facing the discharge hole (52). The protrusion (130) is formed to cause collision with the refrigerant, and a plurality of protrusions (130) are arranged in the horizontal and vertical directions as shown in the drawing.

[0083] The above protrusions (130) are all illustrated as protruding with the same length, but may protrude further outward at locations facing the discharge hole (52). The arrangement of the protrusions (130) may be varied in various ways other than the arrangement illustrated in the drawing.

[0084]

[0085] The above protrusion (130) includes a first protrusion (132a) formed on the curved portion (120) and a second protrusion (132b) arranged below the first protrusion (132a). When the above protrusion (130) is composed of the first and second protrusions (132a, 132b), the contact area with the refrigerant can be increased while simultaneously causing a chain reaction, thereby causing a chain reaction while simultaneously causing diffusion in the limited space of the first chamber (112).

[0086] Therefore, the refrigerant in the gaseous state moves upward in the direction of gravity (G) due to the difference in specific gravity, and the oil with a different specific gravity moves downward in the direction of gravity (G), so that oil separation is stably achieved.

[0087]

[0088] The first protrusion (132a) and the second protrusion (132b) can be arranged at equal intervals from each other, and the interval is set to the interval that provides the best separation efficiency through simulation.

[0089] The above protrusion (130) extends from the rear housing (100) at a predetermined angle toward the direction of gravity (G), and the angle of inclination is not particularly limited and may be varied in various ways. The reason why the protrusion (130) is arranged at an angle is that it is advantageous for the oil to fall stably toward the direction of gravity (G) by its own weight after colliding with the refrigerant.

[0090] In particular, when the protrusion (130) is extended and arranged obliquely as shown in the drawing, when oil is separated in the area where the protrusion (130) is arranged, a natural vertical movement path toward the second chamber (114) is induced, so that the oil can be stably moved toward the oil storage room (114a).

[0091] The first protrusion (132a) and the second protrusion (132b) are formed in multiple numbers, and the number of the first protrusions (132a) is configured to be greater than the number of the second protrusions (132b). In this case, the area of ​​contact between the oil contained in the refrigerant and the first protrusion (132a) increases, thereby increasing the amount of oil falling downward in the direction of gravity (G).

[0092] Additionally, the refrigerant may come into additional contact with the second protrusion (132b), thereby separating oil that was not separated from the first protrusion (132a).

[0093] The attached drawing 7 is a drawing showing another embodiment of the present invention in which an oil separator is included with a curved portion in the rear housing.

[0094] Referring to the attached drawing 7, an oil separator (140) for separating oil contained in the refrigerant is arranged at an angle with respect to the curved portion (120) in the rear housing (100).

[0095] The above oil separator (140) is formed in a cylindrical shape and has a discharge port formed on the upper side, so that the refrigerant in a gaseous state comes into contact with the curved peak (121) formed in the curved portion (120), and the oil in a liquid state can move toward the direction of gravity (G), thereby improving the oil separation efficiency.

[0096]

[0097] Above, one embodiment of the present invention has been described, but a person having ordinary skill in the art will be able to modify and change the present invention in various ways by adding, changing, deleting or adding components, etc., within the scope that does not depart from the spirit of the present invention described in the claims, and this will also be considered to be included within the scope of the rights of the present invention.

[0098] This embodiment enables noise reduction through a structural change in the rear housing installed in the electric compressor, thereby enabling vehicle noise reduction.

Claims

1. Housing; A compression unit provided within the housing; A driving unit provided within the housing and driving the compression unit; The above compression unit includes a fixed scroll and a rotating scroll that rotates relative to the fixed scroll, The refrigerant compressed in the above compression section is discharged to the discharge chamber section formed in the rear housing through the discharge hole formed in the above fixed scroll. A scroll compressor in which a curved portion is formed in the discharge chamber portion, the opposite surface facing the discharge hole being rounded inward.

2. In paragraph 1, The above-mentioned curved portion is a first curved portion that is curved with a first curvature toward the inside of the rear housing from the upper side based on a curved vertex that is curved with a predetermined curvature; A scroll compressor including a second curved portion that is curved at a second curvature toward the inside of the rear housing based on the curved vertex.

3. In paragraph 2, A scroll compressor in which the refrigerant is discharged into the discharge chamber through the discharge hole, comes into first contact with the second curved portion, and then oil is separated and the oil moves downward in the direction of gravity (G).

4. In paragraph 3, The above-mentioned curved peak is formed in a scroll compressor above the discharge hole in the direction of gravity (G).

5. In paragraph 3, The above discharge chamber portion comprises a first chamber formed with a predetermined volume; A second chamber having an independent space via the first chamber and an internal bulkhead; A scroll compressor further comprising a communication hole connecting the first chamber and the second chamber.

6. In paragraph 5, A scroll compressor wherein the first chamber has a larger area than the second chamber.

7. In paragraph 6, A scroll compressor having an oil storage chamber formed in the second chamber of a predetermined size toward the direction of gravity (G).

8. In paragraph 7, A scroll compressor with the inner bulkhead extending obliquely toward the oil storage chamber.

9. In paragraph 1, A scroll compressor having a protrusion formed on the rear housing facing the discharge hole.

10. In paragraph 9, The above protrusion is a first protrusion formed on the curved portion; A scroll compressor including a second protrusion positioned below the gravity direction (G) of the first protrusion.

11. In paragraph 10, A scroll compressor characterized in that the first protrusion and the second protrusion are formed in plurality, and the number of the first protrusions is greater than the number of the second protrusions.

12. In paragraph 10, A scroll compressor in which the above protrusion extends toward the direction of gravity (G) at a predetermined angle from the rear housing.

13. In paragraph 1, A scroll compressor having an oil separator for separating oil contained in the refrigerant arranged at an angle with respect to the curved portion in the rear housing.

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