KR101386468B1 - Scroll compressor - Google Patents

Abstract

The scroll compressor according to the present invention divides between the drive motor and the compression mechanism section of the casing inner space, and installs an oil barrier plate that can restrict the movement of oil of the driving motor side of the casing to the compression mechanism section. Excess oil may be prevented from flowing into the compression chamber, thereby increasing the suction amount of the refrigerant sucked into the compression chamber, thereby increasing the compressor efficiency.

Description

[0001] SCROLL COMPRESSOR [0002]

1 is a longitudinal sectional view showing an example of a scroll compressor according to the present invention;

2 is a plan view seen from the upper side of the main frame in FIG.

Figure 3 is a longitudinal cross-sectional view showing an example of the oil barrier plate in FIG.

Figure 4 is a longitudinal sectional view showing another embodiment of the oil barrier plate in Figure 1,

Figure 5 is a perspective view showing an example of the oil blocking plate and the oil guide member in Figure 1,

Figure 6 is a perspective view showing another example of the oil blocking plate and the oil guide member in FIG.

DESCRIPTION OF REFERENCE NUMERALS

10: casing 14: mainframe

14b: oil pocket 14c: oil supply passage

14d: oil storage groove 14e: first drainage guide passage

14f: 2nd oil drain passage 14g: 3rd oil drain passage

20: drive motor 21a: coil

23: rotating shaft 24: balance weight

25: oil pump 30: compressor section

31: fixed scroll 32: turning scroll

32c: oil injection hole 33: Olddam ring

34: high and low pressure separator 35: check valve

100: oil blocking plate 110: first blocking part

111: distribution passage 112: refrigerant passage

120: second blocking portion 121: oil guide protrusion

The present invention relates to a compressor, and more particularly to a scroll compressor.

Generally, a compressor is a device that converts mechanical energy into compressive energy of a compressive fluid. The compressor may be classified into a reciprocating type, a rotary type, a vane type, and a scroll type according to the compression method for the fluid.

The scroll compressor is provided with a drive motor for generating power in an inner space of the sealed casing and a compressor mechanism for compressing a refrigerant that is a compressive fluid by receiving power of the drive motor.

The compression mechanism is a fixed scroll and the swing scroll is engaged with each other to form a pair of compression chamber while the swing scroll is pivoting with respect to the fixed scroll, and the compression chamber is moved inward to continuously compress the refrigerant discharged Done.

A certain amount of oil is filled in the inner space of the casing, and the oil is sucked up by the centrifugal force as the driving motor rotates, thereby cooling the driving motor and the compression mechanism, and at the same time, some oil flows into the compression chamber and the fixed scroll. It will lubricate the sliding surface between the wheel and the swing crawl.

However, in the conventional scroll compressor as described above, the amount of oil flowing into the compression chamber is not constant, such as the oil which is scattered inside the casing and flows into the compression chamber together with the refrigerant increases or decreases according to the rotational speed of the driving motor. There was a problem that performance is reduced. That is, when the amount of oil flowing into the compression chamber increases, the volume of oil in the compression chamber increases, and the amount of refrigerant suction decreases by that amount. On the contrary, when the sealing force in the compression chamber decreases, leakage of the refrigerant occurs. It was to be increased.

The present invention solves the problems of the conventional scroll compressor as described above, regardless of the rotational speed of the drive motor to limit the inflow of the oil filled in the inner space of the casing into the compression chamber so that the appropriate amount of oil is always supplied to the compression chamber. It is an object of the present invention to provide a scroll compressor that can achieve the same.

In order to achieve the object of the present invention, the casing is provided with a sealed inner space and the oil is accommodated in the inner space; A drive motor installed in the inner space of the casing; A compression unit installed in an inner space of the casing and configured to form a compression chamber by engaging a plurality of scrolls with each other; And an oil cut-off unit disposed between the driving motor and the compression unit and restricting the inflow of the oil contained in the inner space of the casing into the compression unit.

Hereinafter, the scroll compressor according to the present invention will be described in detail with reference to the embodiment shown in the accompanying drawings.

As shown in FIG. 1, the scroll compressor according to the present invention includes a casing 10 in which a seal is formed to fill a predetermined amount of oil, and a refrigerant suction pipe SP and a refrigerant discharge pipe DP are connected to each other, and the casing ( 10 is installed on the upper side of the drive motor 20 to generate a rotational force, and the compression mechanism unit 30 is provided below the casing 10 to receive the rotational force generated from the drive motor 20 to compress the refrigerant It consists of.

The casing 10 is formed in a cylindrical shape and is sealed by covering the main body 11 and the upper and lower sides of the main body 11 and the main body 11 on which the drive motor 20 and the compression mechanism part 30 are fixedly installed on both upper and lower sides of the inner circumferential surface thereof. The upper cap 12 and the lower cap 13 is made up.

The main frame 14 and the subframe 15 having fixed holes 14a and 15a are respectively fixed to upper and lower sides of the main body 11 so as to support the rotation shaft 23 of the driving motor 20. In addition, an oil level pipe 16 and an oil recovery pipe 17 connected to the refrigeration cycle system communicate with the lower half of the main body 11 so as to maintain an appropriate amount of oil. The oil return pipe 17 communicates lower than the oil level pipe 16.

The main frame 14 has a bearing hole 14a penetrating through the center thereof, and an oil pocket 14b is formed at the upper end of the bearing hole 14a so that oil drawn up through the rotating shaft 13 to be described later is collected. do.

The drive motor 20 is fixed to the inside of the casing 10 as shown in Figure 1 and the stator 21 to receive power from the outside, the stator 21 is disposed with a predetermined gap inside the stator Rotor 22 that rotates while interacting with (21), and the rotary shaft 23 is coupled to the rotor 22 in the shrinkage to transmit the rotational force of the drive motor 20 to the compression mechanism (30) Is done.

The stator 21 has a cylindrical laminated body (unsigned) in a cylindrical shape so that the rotor 22 is rotatably positioned at the center thereof, and a coil 21a connected to an external power source is wound around the tooth portion. Is done.

The rotor 22 has a shaft hole 22a formed in the center of the rotary laminated body (unsigned) formed by stacking a plurality of thin steel plates in the axial direction so that the rotating shaft 23 is fixed in shrinkage, and the football A circular arc-shaped magnetic flux barrier 22b is formed in the radial direction along the circumferential direction of the rotary laminated body with respect to the yoke 22a.

At least one oil recovery groove 22c may be formed in the main surface of the shaft hole 22a to increase the heat dissipation effect while the recovered oil passes through the rotor 22. The oil recovery groove 22c may be formed in a direction coinciding with an axial direction, and may be formed in an axial direction inclined at a predetermined angle. When the oil recovery groove 22c is inclined, the oil recovery groove 22c may be formed in the rotational direction of the rotation shaft 23 when the upper side is lower than the lower side.

The rotating shaft 23 has an oil passage 23a penetrating therein in the axial direction, and oil sucked in the middle of the oil passage 23a is a bearing hole of the subframe 15 and the main frame 14. Oil through holes 23b and 23b are radially penetrated in both the upper and lower sides so as to be supplied to the 15a and 14a through the oil passage 23a between the oil through holes 23b and 23b. At least one degassing hole 23c or 23d may be formed so that the bubbles sucked up with the oil may be discharged out of the oil passage 23a.

In addition, a balance weight 24 is installed at the upper end or upper and lower ends of the rotation shaft 23 so as to offset the unloading load of the rotation shaft 23, and at the lower end of the rotation shaft 23, oil of the casing 10 is provided. An oil pump 25 is installed to pump the oil. The balance weight 24 may be installed on the rotation shaft 23, but in some cases, the balance weight 24 may be installed on the rotor 22. The oil pump 25 may be a trochoidal gear pump (Trochoidgear PumP) to form a volume of the inner gear and the outer gear so as to reduce the time of the lubrication disconnection due to the change in suction pressure and the vaporization of the liquid refrigerant. Of course, the oil pump may be used in addition to the trocoid gear pump.

The main compression mechanism 30 is fixed to the fixed scroll 31 is installed on the upper surface of the main frame 14, as shown in Figure 1, and the fixed scroll 31 to engage the fixed scroll 31 to form a plurality of compression chamber (P) An all-damm ring that is pivotally mounted on an upper surface of the frame 14 and is provided between the pivoting scroll 32 and the main frame 14 to pivot while preventing rotation of the pivoting scroll 32. (Oldham's ring) 33 and the high and low pressure separating plate 34 is provided on the rear surface of the hard plate portion of the fixed scroll 31 to partition the inside of the casing 10 into the suction space (S1) and the discharge space (S2). And a check valve 35 for opening and closing the discharge port 31c of the fixed scroll 31 to block the reverse flow of the discharge gas.

The fixed scroll (31) has a fixed wrap (31a) forming a pair of compression chamber (P) on the bottom surface of the hard plate portion is formed in the involute shape, the suction of the casing (10) on the side of the hard plate portion A suction port 31b communicating with the space S1 is formed, and a discharge port 31c for discharging the compressed refrigerant into the discharge space S2 of the casing 10 is formed at the center of the upper surface of the hard plate portion.

The turning scroll 32 is formed on the upper surface of the hard plate portion of the rotating wrap (32a) forming a pair of compression chamber (P) together with the fixed wrap (31a) of the fixed scroll 31 is formed in the involute shape The boss 32b is coupled to the rotation shaft 23 at the center of the bottom surface of the hard plate part to receive the power of the driving motor 20.

The hard disk portion of the turning scroll 32 communicates with the oil supply passage 14c of the main frame 14 so that the oil supplied through the oil supply passage 14c can be supplied to the compression chamber P. The lubrication injection hole 32c can be formed. The oil injection hole 32c is preferably formed before the start of compression of the turning wrap 32a so as to block the leakage of the refrigerant in the compression chamber P through the oil injection hole 32c. In addition, an oil storage groove 14d may be formed at an end of the oil supply passage 14c of the main frame 14 so that oil is always supplied through the oil supply injection hole 32c. have.

The scroll compressor of the present invention operates as follows.

That is, when power is applied to the drive motor 20, the rotating shaft 23 rotates together with the rotor 22 to transmit a rotating force to the turning scroll 32, and the rotating scroll receives the rotating force. 32 is a turning wrap of the fixed scroll (31a) of the fixed scroll (31) and the turning scroll (32) while turning by an eccentric distance from the upper surface of the main frame 14 by the old dam ring (33) ( A pair of compression chambers P which are continuously moved between 32a) is formed, and the compression chambers P are moved to the center by the continuous rotational movement of the turning scroll 32 and the volume is reduced and the refrigerant is sucked in. Will be compressed. The compressed refrigerant is continuously discharged to the discharge space S2 of the casing 10 through the discharge port 31c of the fixed scroll 31 and then moved to the refrigeration cycle system through the refrigerant discharge pipe DP. You will repeat a series of steps.

At the same time, the oil pump 25 installed on the lower side of the rotary shaft 23 pumps the oil filled in the casing 10, and the oil is pumped upward through the oil channel 23a of the rotary shaft 23. While being sucked up, some of the oil is supplied to the bearing holes 15a and 14a of the subframe 15 and the main frame 14 through the oil through holes 23b and 23b, while some oil is supplied to the upper end of the rotating shaft 23. Scattered at The oil scattered from the upper end of the rotary shaft 23 is stored in the oil pocket 14b of the main frame 14, and some oil is transferred to the casing 10 through the first drainage guide passage 14e to be described later. While the oil is recovered, some of the oil moves to the thrust bearing surface of the main frame 14 through the oil supply passage 14c and then through the oil injection hole 32c of the turning scroll 32, the compression chamber P. Is supplied.

Here, the oil filled in the inner space of the casing 10 is scattered by the balance weight 24 and mixed with the refrigerant, and the oil mixed with the refrigerant when the refrigerant is sucked into the compression chamber P Can be inhaled together. However, it is not preferable to increase the specific gravity of oil being mixed into the refrigerant and sucked into the compression chamber among the total amount of oil sucked into the compression chamber P because the supply amount of oil varies greatly according to the operating conditions of the compressor.

In view of this, in the present invention, as shown in FIG. 1, the drive motor 20 and the compressor sphere 30 are blocked so that oil scattering in the inner space of the casing 10 is not introduced into the compression chamber of the compressor sphere 30. The oil blocking plate 100 is installed in the main frame 14 provided between the two.

For example, as shown in FIGS. 2 and 3, the main frame 14 has a first drainage guide so that oil collected in the oil pocket 14b on one side surface of the oil pocket 14b can be recovered to the casing 10. The passage 14e is formed through the outer circumferential surface, and the second oil drain guide passage 14f is annularly communicated with the bottom surface in contact with the oil barrier plate 100, and the bottom surface from the top surface of the main frame 14 is formed. 3 The drainage guide passage 14g is formed through.

The first oil supply guide passage 14e has an inlet of the first oil supply guide passage 14e so that oil can be smoothly supplied to the compression chamber P through the oil supply passage 14c. It is preferably formed higher than the inlet of 14c). The third drainage guide passage 14f is provided on the upper surface of the main frame 14 so that the key portion (not shown) of the old dam ring 33 is vertically inserted into the key groove portion (not shown) to slide in a radial direction. It may be formed to penetrate through.

The oil blocking plate 100 may include a first blocking part 110 that bisects the internal space of the casing 10 so that the oil of the driving motor 20 does not move freely toward the compression mechanism part 30, and the Wrapping the balance weight 24 is made of a second blocking portion 120 to block the oil from scattering in the balance weight (24).

The first blocking unit 110 is formed in an annular disk shape such that its outer circumferential surface is in close contact with the inner circumferential surface of the casing 10, and on one side of the outer circumferential surface, oil supplied to the compressor sphere 30 toward the driving motor 20 is provided. The exhaust passage 111 is formed intaglio so as to be discharged toward the side. In addition, the oil discharge guide member 200 is formed in the oil discharge passage 111 to be extended toward the lower side of the casing 10 so that oil discharged from the compression mechanism part 30 does not scatter again inside the casing 10. Is installed connected.

The drainage guide member 200 is formed in a cross-sectional shape of a 'D' (Z) 'as shown in Figs. 2 and 5, and the casing 10 such that the opening side forms an drainage path with the inner circumferential surface of the casing 10. Is coupled to the welding, etc. The oil drain guide member 200 is formed in a tapered shape that is reduced downward so that oil recovered through the oil drain passage 111 of the first blocking unit 110 can be smoothly drained. The outlet may extend to a position lower than the upper end of the coil 21a of the driving motor 20 to prevent the oil being drained from being mixed with the oil or the refrigerant that is scattered.

The drain guide member 200 may be formed in a pipe shape as shown in FIG. In this case, the drain passage 111 of the first blocking unit 110 may be formed in a hole shape rather than a groove shape so as to be intimately coupled with the drain guide member 200.

In addition, a refrigerant passage 112 is formed on the other outer circumferential surface of the first blocking unit 110 so as to correspond to a suction pipe SP communicating with an inner space of the casing 10, and the refrigerant passage 112 is the suction tube. An oil separator (unsigned) separating the liquid refrigerant and the oil from the refrigerant sucked through the SP may be inserted or communicated. The refrigerant passage 112 is formed in the case of a low pressure scroll compressor in which the inner space of the casing 10 is filled with suction pressure, whereas in the case of a high pressure scroll compressor in which the inner space of the casing 10 is filled with discharge pressure. May not be necessary.

On the other hand, the second blocking portion 120 is integrally extended from the inner peripheral surface of the first blocking portion 110 is formed in a cylindrical shape as shown in FIG. 3 or a truncated cone shape extending downward as shown in FIG. Can be. In addition, the second blocking part 120 is preferably formed in an area that can accommodate the balance weight 24 in both the cylindrical and the truncated cone shape, since it can prevent the oil from being scattered by the balance weight 24. In addition, the second blocking portion 120 has a cylindrical or truncated cone-shaped area capable of accommodating the coil 21a of the stator 21 or oil recovered by contacting the oil blocking plate 100. It is preferred that it be formed at least in an area overlapping in the vertical direction so that it can be directly supplied dropwise to 21a). As shown in FIG. 4, the second blocking unit 120 collects oil scattered while the balance weight 24 rotates inside thereof, and supplies at least one oil guide protrusion 121 at a bottom thereof to supply the coil 21a. ) May be formed in a circular shape. The oil guide protrusion 121 may be formed on the bottom surface of the first blocking unit 110.

As described above, in the scroll compressor in which the oil blocking plate 100 is installed, oil scattered in the inner space of the casing 10 is blocked by the first blocking unit 110 of the oil blocking plate 100, and thus the driving motor 20. It can not be easily moved from the side toward the compression mechanism (30). However, the oil is introduced between the main frame 10 and the turning scroll 32 through the oil supply passage 14c in the oil pocket 14b and then supplied to the compression chamber P or the refrigerant passage 112. It may be supplied to the compression chamber (P) with the refrigerant through.

The oil collected in the compression pocket or the oil supplied between the main frame and the turning scroll or the oil supplied to the compression chamber is guided to the drain passage of the first blocking part along each drain guide passage. It is recovered toward the drive motor through an oil distribution guide member connected to the circulation passage and the oil passage. In this process, as the oil is separated from the oil scattered by the oil drain guide member, movement of the oil toward the compression mechanism unit with the refrigerant can be prevented in advance.

The scroll compressor according to the present invention may be partitioned between the drive motor and the compression mechanism to restrict the movement of the driving motor oil of the casing toward the compression mechanism so as to prevent excessive oil from flowing into the compression chamber of the compression mechanism. In this way, the compressor efficiency may be increased by increasing the suction amount of the refrigerant sucked into the compression chamber.

Claims (17)

A casing provided with a sealed inner space and containing oil in the inner space; A drive motor installed in the inner space of the casing; A compression unit installed in an inner space of the casing and configured to form a compression chamber by engaging a plurality of scrolls with each other; And And an oil cut-off unit disposed between the driving motor and the compression unit to restrict oil flowing into the compression unit from the oil accommodated in the inner space of the casing. The oil blocking unit is installed so that its outer circumferential surface is in close contact with the inner circumferential surface of the casing, and the oil blocking unit is formed with at least one drainage passage so that oil on the compression unit side to move toward the drive motor. delete The method according to claim 1, And a drainage guide member is connected to the drainage passage so that oil is guided. The method of claim 3, The oil discharge guide member is a scroll compressor, the one side of which is open to form an oil passage along with the inner peripheral surface of the casing. The method of claim 3, The oil drain guide member is formed in a pipe shape scroll compressor. The method according to claim 1, And a frame for supporting a rotation shaft of the drive motor is installed between the drive motor and the compression unit in the inner space of the casing, and the oil cutoff part is fixed to the frame. The method according to claim 6, The oil cutoff portion is formed with at least one drainage passage so that the oil on the compression unit moves toward the driving motor, and the frame has at least one drainage flow passage to move the oil toward the drainage passage of the oil shutoff portion. The scroll compressor is formed. 8. The method of claim 7, The oil drainage passage is scroll compressor that is formed intaglio on the surface in contact with the oil blocking. 8. The method of claim 7, The oil drainage guide passage is formed through the upper surface of the frame through the scroll compressor. 8. The method of claim 7, The oil discharge guide passage is formed in the center of the frame scroll compressor is formed through the inner circumferential surface of the oil pocket is filled with oil to the outer peripheral surface. 11. The method of claim 10, And an oil supply passage is formed in the frame to penetrate from the inner circumferential surface of the oil pocket to the upper surface of the frame. 12. The method of claim 11, Scroll inlet is formed higher than the inlet of the oil supply passage. The method according to claim 1, And the oil blocking part includes a first blocking part whose outer circumferential surface is in close contact with an inner circumferential surface of the casing, and a second blocking part which wraps a balance weight coupled to a rotor or a rotating shaft of the driving motor therein. delete delete delete The method according to claim 1, And a refrigerant passage formed in the oil blocking unit to allow the refrigerant to flow therethrough.

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