KR100987539B1 - Centrifugal Compressor having Structure for Preventing Oil Likeage - Google Patents

Abstract

The present invention relates to a centrifugal compressor having an oil leakage preventing structure, wherein the sealing member is pressurized to prevent the leakage of oil, while changing the structure of the sealing member to prevent leakage of oil and simplifying the structure. It is.

The present invention provides a rotary shaft 36 for rotating the impeller 37, a bearing 40 provided on the outer peripheral surface of the rotary shaft 36 to smoothly rotate the rotary shaft 36, and the bearing 40 A centrifugal compressor having an oil leakage prevention structure consisting of a seal member 200 to prevent leakage of the supplied oil and a sump 58 for recovering the supplied oil, wherein the seal member 200 includes a rotating shaft 36 and It is provided to be rotated together, the casing 100 surrounding the seal member 200 is formed with a space portion 110 to allow the rotation of the seal member 200, the space portion 110 is a plurality of through holes ( 111 is formed, the movement passage 120 is formed in the circumferential direction so as to communicate with the through-hole 111, the through-hole 112 to communicate with the moving passage 120 is formed, the through-112 Oil is returned to the sump (58), which extends from And that the passage 57 is in communication with the flow channels 130 to allow suction of the fluid formed in the features.

The present invention having such a configuration, unlike the prior art to seal the sealing member in a pressurized manner to prevent the leakage of oil, instead of preventing the leakage of the oil by the suction method, so that the seal member is configured to rotate integrally with the rotating shaft There is an effect that the oil is scattered and is easily recovered to the sump through the passage.

Centrifugal, compressor, oil, leakage, resistant, labyrinth, seal, pressure

Description

Centrifugal Compressor having Structure for Preventing Oil Likeage

The present invention relates to a centrifugal compressor having an oil leakage preventing structure, and more particularly, to change the structure of the sealing member to prevent the leakage of oil while the pressure of the sealing member is coupled to the suction method to prevent the leakage of oil. The structure is simplified.

In general, centrifugal compressors used in refrigeration systems, air conditioning systems and the like tend to move oil (lubricating oil) from the power train to other parts of the machine. Therefore, in such a device, it is necessary to recover the leaked oil and return it to the power transmission device to enable continuous operation of the machine, and to prevent the performance of the heat exchanger from being degraded due to the mixing of oil.

Looking at an example of a conventional centrifugal compressor, it is disclosed in US Patent No. 4,997,340 (hereinafter referred to as "prior patent"), which will be described in more detail below with reference to the drawings.

As shown in FIG. 1, the prior patent has a centrifugal compressor device 11 having an electric motor 12 at one end and a centrifugal compressor 13 at the other end, which are interconnected by a transmission 14. Configure.

The motor 12 comprises an outer casing 16 having a stator coil 17 arranged on its inner circumferential surface, the rotor 18 protruding upward from the transmission 14, thereby supporting the rotor shaft 19. Are rotated in the stator winding 17. The transmission 14 has a transmission case 21 having an annular flange 22 extending radially fixed between the motor casing 16 and the compressor casing 23 by a plurality of bolts 24. 21 and the compressor casing partially define the transmission chamber 30.

The transmission shaft 28, which is rotatably mounted in the transmission case 21 by a pair of axially spaced bearings 26, 27, is integrally formed as an extension of the motor shaft 19 and is a collar. 29 is provided to transmit thrust from the shaft 28 to the thrust bearing portion of the bearing 26. The end of the shaft 28 extends beyond the transmission case 21, the drive gear 31 is attached by the retaining plate 32 and the bolt 33, the drive gear 31 is connected to the compressor impeller 37. The high speed shaft 36 is sequentially engaged with the driven gear 34 which drives the high speed shaft 36 for direct drive, and the high speed shaft 36 is supported by the journal bearings 34 and 40.

In addition, in order to reduce windage loss in the transmission chamber 30 and to prevent oil loss from the transmission chamber 30, the transmission chamber 30 includes a passage 55, a tube 65 and a compressor suction pipe 75. Is vented to the low pressure section (i.e., compressor intake pressure section) in the apparatus.

In addition, in order to cool the motor 12, liquid refrigerant flows from the condenser (not shown) into the one end portion 41 of the motor 12 by the dispersion hole 42, and the liquid refrigerant 43 is boiled. It flows into the motor chamber 45 to cool the motor 12, and the refrigerant gas is returned to the cooler by the conduit 44. The back pressure valve 46 is embedded in the conduit 44 to maintain the set pressure difference between the coolers. The compressor intake pipe 75 at the point where the transmission exhaust pipe 65 is connected has a pressure lower than the pressure of the cooler. Thus, the pressure in the motor chamber is maintained at a pressure higher than the pressure in the transmission chamber 30.

In addition, the opening 47 in the annular flange 22 of the transmission case 21 is in communication with the motor chamber 45. The line 48 is attached to the opening 47 at one end by the coupling member 49 and at the other end of the line 48 to flange the line 48, as shown in FIGS. 1 and 2. It is attached to the coupling member 51 which fluidly connects to the channel | path 52 formed in 53. As shown in FIG. The bearing 40 acts as a journal bearing to maintain the radial position of the shaft 36 and a thrust bearing to maintain the axial position. The oil supply passage 54 is provided as a conduit for flowing oil radially inwardly toward the bearing surface, and an oil slinger 50 is provided for conveying oil radially outward from the shaft 36. The annular cavity 56 then acts to receive the oil carried from the bearing 40 and to facilitate draining the oil behind the sump 58 through the passage 57.

A balance piston is provided by the low pressure cavity 59 behind the impeller 37 wheel to offset the aerodynamic thrust generated by the impeller 37, and the passage 61 is a cavity 59. An internal pressure is provided to the impeller 37 to maintain a low pressure as at the compressor intake 60. Since the pressure in the transmission casing is higher than the pressure in the cavity 59, in particular the pressure during actuation, a labyrinth seal with teeth 63 incorporated therein balances the piston piston 59 from the transmission chamber. Is provided between the bearing 40 and the impeller 37 to seal the area for oil flow into the c). This is to pressurize the labyrinth seal by applying a high pressure gas on the labyrinth seal. Typically, when high pressure gas from the discharge line is used to pressurize the labyrinth seal 62, a substantial pressure difference causes high pressure steam to flow from the labyrinth seal 62 to the low pressure intake of the device, leading to a decrease in its efficiency. This flow can occur in two directions, shown by arrows in FIGS. 1 and 2, which can flow along the passage 61 to the compressor intake 60, and also the sump 58 along the passage 57. It can flow through the inlet pipe 75 through the opening 55 and the tube 65 from the direction shown by the arrow of Figure 1 and finally to the compressor intake 60.

To prevent this loss, the labyrinth seal 62 is pressurized with a refrigerant vapor in the motor chamber 45 and the vapor is line 48, passage 52 and passage 66 of the labyrinth seal 62. Flows through. Thus, the labyrinth seal 62 is pressurized to a motor casing pressure higher than the transmission pressure. By minimizing this pressure difference, the loss caused by the pressurized gas of the labyrinth seal is leaked into the transmission chamber and the pressurized gas of the labyrinth seal is directly leaked to the compressor intake unit 60. Similarly, the pressure difference between the labyrinth seal 62 and the compressor intake section 60 is minimized, and the loss caused by direct leakage of the pressurized gas of the labyrinth seal to the compressor intake section 60 by the passage 61 is also achieved. Minimize.

However, such a prior art patent has a complicated structure because the line 48 and the passage 66 for supplying the pressurized gas are separately provided, and the back pressure valve 46 for adjusting the magnitude of the pressurized pressure is provided. In addition, there was a problem that the pressure control of the pressurized gas is not easy.

In addition, when pressurizing the center of the labyrinth seal 62 with the pressurized gas, if the pressure of the pressurized gas is high, the pressurized gas may leak into the bearing 40 to damage the bearing 40, and to drive the compressor. If the magnitude of the pressure applied at the start time is lower than the pressure of the oil, there is a problem that the oil supplied to the bearing 40 may leak substantially toward the impeller 37.

The present invention has been invented to solve the conventional problems as described above, and the structure is simple, and the source of the pressurized gas to pressurize the seal member is basically blocked, and the oil coming out of the seal member can be sucked and recovered smoothly. It is to prevent oil leakage effectively.

The present invention provides a rotating shaft for rotating the impeller, a bearing provided on the outer circumferential surface of the rotating shaft to smoothly rotate the rotating shaft, a seal member for preventing leakage of the oil supplied to the bearing, and recovering the supplied oil. A centrifugal compressor having an oil leakage preventing structure consisting of sump,

The seal member is provided to be rotated together with the rotating shaft, and a casing surrounding the seal member is provided with a space portion through which the seal member is rotated, and a plurality of through holes are formed in the space portion, and the circumferential direction is in communication with the through hole. A mobile passage is formed, and a through hole is formed to communicate with the mobile passage, and the mobile passage communicates with a passage through which the oil is recovered to the sump, which is formed at a low pressure while extending from the through hole. It is characterized by the technical features formed.

An oil slinger is further provided on an outer circumferential surface of the rotating shaft, and the seal member is fixed to the outer circumferential surface of the oil slinger to be rotatable together.

In addition, the sealing member is a labyrinth sealing member, a structure in which a plurality of seal end portions of a triangle symmetrically up and down around a center thereof may be formed.

In addition, the seal member has a structure in which a plurality of seal end portions of a right triangle which are vertically and symmetrical around a center may be formed.

In addition, the seal member has a structure in which a plurality of seal end portions of up and down symmetrical triangles and right triangles may be formed in a center.

In addition, the inner surface of the insertion hole of the casing is a structure that can be provided with a serrated seal member.

The oil slinger has a structure in which two collars are formed at intervals at the tip, and first and second throttle regions are formed in the cavity in which the collar is accommodated.

The oil slinger has a structure in which a through hole may be formed in at least one of the collars.

The through holes formed in both the collars of the oil slinger may be arranged and formed to be offset from each other.

A conical collar is formed at the tip of the oil slinger, and the cavity of the casing to correspond to the collar includes a ramp formed to correspond to the inclined surface of the collar, and a plurality of passage holes through which the oil moved through the ramp enters. A moving path connected to the through hole to move the oil downward and moving with a pressure drop, and a passage through the connecting path formed in the circumferential direction of the oil slinger to communicate with the moving path, The passage is connected to the moving passage communicating with the space portion in which the seal member is accommodated through the passage formed in the lower portion of the rotary shaft through the connecting passage to recover the oil to the sump through the passage.

The passage hole and the moving path is a structure that can be formed in the upper semi-circular portion of the rotating shaft.

The moving path is a structure having a relatively wider area than the through hole while forming a structure in which the stepped portion is formed so that the pressure drop of the oil occurs by the throttling action.

The cavity portion in which the conical collar formed at the tip of the oil slinger is accommodated is an incline to correspond to the inclined surface of the collar, and an axial region portion to form a relatively wider area than the incline so that the oil moves from the incline to lower the pressure. The cavity is connected to the sump at the lower part of the rotating shaft, and has a structure connected to a passage for recovering oil and a lower movement passage of the seal member.

The upper portion of the cavity is a structure that can be formed with a slope inclined downward so that the oil can move quickly.

The cavity, in which the conical collar of the oil slinger is accommodated, includes a ramp to correspond to the inclined surface of the collar, a dwelling groove for temporarily retaining oil moved from the inclined path, and a pressure drop while falling downward through the dwelling groove. Consists of a throttle zone formed in a relatively wide area as possible,

The cavity is connected to the sump at the lower portion of the rotation shaft is a structure that is connected to the passage of the oil recovery and the lower movement passage of the seal member.

The inclined surface that is inclined downward so that the oil is quickly moved downward in the upper portion of the throttling region of the cavity.

The inside of the casing is a structure that can be provided with a cooling gas pipe to reduce the pressure of the oil in the cavity by flowing the cooling gas while corresponding to the cavity forming range.

When the collar of the oil slinger rotates at the same time as the rotation of the rotary shaft, a plurality of through holes are formed around the cavity so that the introduced oil is dispersed and discharged and recovered as a sump through the passage formed in the lower portion of the rotary shaft.

Between the through holes is a structure in which a pressurized hole to accelerate the oil flowing into the cavity portion to be quickly discharged into the through hole can be formed.

Thus, the present invention, unlike the prior art to seal the sealing member in a pressurized manner to prevent the leakage of oil, instead of preventing the leakage of oil by the suction method, the seal member is configured to rotate integrally with the rotating shaft of the oil There is an effect that it is easily scattered through the passage to the sump.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

The same components as in the prior art will be described with the same reference numerals, and the new components will be described with the new reference numerals in detail.

As shown in FIG. 3, a bearing 40 for smooth rotation of the rotating shaft 36 is provided on an outer circumferential surface of the rotating shaft 36 capable of rotating the impeller 37. An oil supply passage 54 through which oil (lubricating oil) can pass is formed at the top. In addition, an oil slinger 50 is rotatably coupled with the rotating shaft 36 at the outer circumferential surface of the rotating shaft 36 and at the side of the bearing 40.

The oil slinger 50 has a radial collar 50a formed at one end thereof. The collar 50a is disposed in the cavity 56 for smooth rotation when the oil slinger 50 rotates at the same time as the rotation shaft 36 rotates.

Here, in the present invention, a plurality of through holes 111 are formed on the circumferential surface of the inner space part 110 of the casing 100, and the moving passages 120 are formed in the circumferential direction so as to communicate with the through holes 111. A through-hole 112 is formed to communicate with the moving passage 120, and extends from the through-hole 112, the moving passage communicating with the passage 57 to recover the oil to the sump 58 for storing the oil ( 130) is formed.

In addition, the seal member 200 is coupled to and fixed to the outer circumferential surface of the oil slinger 50 while being located in the space 110 of the casing 100.

In addition, as shown in FIG. 5, the seal member 200 may be formed by arranging a plurality of seal end portions 210 having upper and lower symmetrical triangles around the center thereof.

Also, as another example, as shown in FIG. 6, the seal member 200 may be formed by arranging a plurality of seal end portions 220 of right triangles that are vertically symmetrical about a center thereof.

Also, as another example, as shown in FIG. 7, the seal member 200 may be formed by a plurality of mixed seal end portions 230 of a triangle and a right triangle that are symmetrical with respect to the center thereof. .

On the other hand, the present invention is a structure in which the toothed seal member 102 is provided on the inner surface of the insertion hole 101 of the casing (100).

In addition, the present invention shows another example oil slinger 70, as shown in FIG. The oil slinger 70 has a structure in which two collars 71 and 72 are formed at intervals at the tip.

A plurality of through holes 71a may be formed in the collar 71 over the entire surface.

In this case, the first and second bridges are formed by the arrangement of the collars 71 and 72 in the cavity 103 of the casing 100 where the collars 71 and 72 of the oil slinger 70 are located. Regions 103a and 103b are formed.

In addition, as shown in FIG. 10, a through hole 72a may also be formed in the collar 72 of the oil slinger 70. In this case, the through-holes 71a arranged and formed in the collar 71 and the through-holes 72a arranged and formed in the collar 72 are arranged and formed to be offset from each other. That is, the two through holes 71a and 72a do not coincide when passing an imaginary horizontal line in the drawing.

In addition, the present invention is another embodiment of the oil slinger, as shown in Figure 11, the tip of the oil slinger 80 may be formed with a conical collar 81.

To fit the shape of the conical collar 81, the cavity 104 of the casing 100 includes a ramp 104a formed so as to correspond to the inclined surface of the collar 81, and oil moved through the ramp 104a. The passage hole 104b is formed to be a plurality of inflow, and the movement path 104c is formed so that the oil moved while being connected to the passage hole 104b is moved downward, while the pressure drop is made, the movement path 104c And a passage passage 104d formed in the circumferential direction and communicating with the coupling passage 80a formed on the circumferential surface of the oil slinger 80, and formed in the lower portion of the rotary shaft 36 via the coupling passage 80a. Passing through the passage (104d) is connected to the moving passage 130 in communication with the space portion 110, the moving seal member 200 is accommodated so that the oil is recovered to the sump (58) via the passage (57).

Preferably, the through hole 104b and the movement path 104c are formed only on the upper part of the rotation shaft 36, that is, the upper semicircle.

Moreover, the movement path 104c has a relatively wide area compared to the through hole 104b while forming a stepped structure, so that a throttling action may occur, resulting in a pressure drop of oil.

In addition, according to another embodiment of the present invention, as shown in FIG. 13, the cavity 105 in which the conical collar 81 formed at the tip of the oil slinger 80 is accommodated is an inclined surface of the collar 81. And an throttling region 105b that forms a wider area than the ramp 105a so that oil is moved from the ramp 105a to lower the pressure.

The upper portion of the throttling region 105b is inclined downward, so that the inclined surface 105c for rapidly moving the oil downward is formed.

Of course, the cavity portion 105 is connected to the sump 58 at the lower portion of the rotary shaft 36 and the passage 57 for collecting oil and the lower movement passage 130 of the seal member 200.

Also, as another example, as shown in FIG. 14, the present invention provides an inclined path in which the cavity 106 in which the conical collar 81 of the oil slinger 80 is accommodated corresponds to the inclined surface of the collar 81. 106a, a retention groove 106b for temporarily holding the oil transferred from the ramp 106a, and a throttle formed in a relatively wide area so that the pressure drops while falling downward through the retention groove 106b. It consists of an area portion 106c.

In addition, an inclined surface 106d is formed on the upper portion of the throttling region 106c so as to be inclined downward so that the downward movement of oil can be performed more quickly.

The cavity 106 is connected to the sump 58 at the lower portion of the rotation shaft 36 and to the passage 57 for recovering oil and the lower movement passage 130 of the seal member 200.

On the other hand, as another embodiment of the present invention, as shown in Figure 15, the casing 100 may be provided with a cooling gas pipe 107 is arranged to allow the cooling gas flows corresponding to the cavity forming range. It is connected to the conduit 44 of the refrigerant gas shown in FIG.

The cooling gas pipe 107 is to reduce the temperature in the cavity while passing through the cavity containing the collar of the oil slinger in the above-described embodiment so that the pressure drop is made.

In addition, the present invention is another embodiment as shown in Figure 16, in which the oil slinger in this embodiment, specifically, the collar 81 of the oil slinger 80 is to be rotated at the same time as the rotation of the rotary shaft 36 At this time, the introduced oil is dispersed (dotted arrow in the drawing) to form a plurality of through holes 108a around the cavity 108, and the oil passing through the through holes 108a is again rotated by the shaft 36. It is a structure to be recovered to the sump (58) through the passage (57) formed in the lower portion. At this time, since the low pressure is formed in the sump 58, oil can be recovered through the passage 57 more smoothly.

The present invention is not limited to the oil slinger 80 exemplified above, and other oil slingers having other structures are equally applicable.

At this time, between the through holes 108a may be formed with pressurized holes 108b for accelerating oil flowing into the cavity 108 to be discharged more quickly to the through holes 108a.

The plurality of pressurization holes 108b may allow high pressure air to pass through a discharge line (not shown).

The present invention having such a configuration, as shown in Figure 3, the oil is supplied through the oil supply passage 54 to move to the right in the drawing while entering the bearing 40, in this case, the impeller 37 for compression When the rotating shaft 36 for rotating) (shown in FIG. 1 or 2) is rotated, the oil slinger 50 coupled to the outer circumferential surface of the rotating shaft 36 also rotates at the same time.

Accordingly, when the oil is about to move towards the cavity 56, it is withdrawn by the collar 51 of the rotating oil slinger 50 and withdrawn to the sump 58 via a passage 57 located below.

However, since it is difficult to completely prevent the leakage of oil by the oil slinger 50, the seal member 200 which is located in the space 110 of the casing 100 and coupled to the outer circumferential surface of the oil slinger 50 is fixed. ) Can prevent oil leakage more completely.

In other words, at the time of rotation of the rotating shaft 36, since the high speed rotation, the pressure of the oil rises. Therefore, the oil whose pressure is high tries to move via the seal member 200, but the seal member 200 rotates at the same time as the rotation of the rotary shaft 36, so that the oil is dispersed by centrifugal force. Dispersed oil, as shown in Figure 8, is exited through a plurality of, formed through the hole 111 in the space portion 110 of the casing 100, and then moved through the moving passage 120 formed in the circumferential direction It is discharged through the through-hole 112 formed in the lower portion.

At this time, the through hole 112, as shown in Figure 3, it is to be in communication with the moving passage 130 formed through the casing 100, the oil discharged through the through hole 112 is the moving passage 130 Moving through, the moving passage 130 is again connected in communication with the passage 57 is recovered to the sump (58) via the passage (57).

Here, in the present invention, the sump (58) is basically formed at low pressure, and the passage (57) communicating with the sump (58) is connected to communicate with the moving passage (130) passing through the casing (100). Since the oil introduced into the space 110 of the casing 100 flows in a state in which the pressure is high, the oil is naturally sucked and recovered toward the sump 58 forming a low pressure. As a result, the oil can be prevented from leaking to the impeller.

On the other hand, the seal member 200 according to the present invention is provided with a variety of structures, as shown in Figure 5 to 7, the seal end portion 210 to form an upper, lower triangle with respect to the center and the center Through the seal end portion 220 forming an upper and lower right triangles, and the seal end portion 230 formed of a mixture of the seal end portions 210 and 220, the oil may be more effectively dispersed.

More specifically, in the case of the seal end 210, when the seal end 210 also rotates at the same time as the rotation shaft 36 rotates, the oil present in the seal end 210 is dispersed outward by the action of centrifugal force. In addition, each seal end 210 is formed in a triangle and the outer surface of the seal end 210 forms an inclined surface facing each other, so that the oil can be more effectively dispersed and easily discharged through the through hole 111. .

On the other hand, the sealing member 102 is formed in the inner surface of the insertion hole 101 of the casing 100 into which the rotating shaft 36 is inserted, so that oil leakage can be blocked more reliably again.

In addition, the present invention, as shown in Figures 9 to 16, as another embodiment, by varying the structure of the oil slinger and the cavity portion can be lowered the pressure of the oil flowing in to allow the oil to prevent leakage.

In other words, as shown in FIG. 9, two colors 71 and 72 are formed in the oil slinger 70 so that the pressure drop of the moving oil can be prevented, thereby preventing oil leakage.

More specifically, the collars 71 and 72 are formed to be spaced from each other, the oil moving through the bearing 40 flows into the cavity 103 in which the collars 71 and 72 are disposed. . At this time, since the oil slinger 70 also rotates at the same time while the rotation shaft 36 rotates at high speed, the oil between the distal end of the collar 71 and the upper wall surface of the cavity 103 according to the rotation of the collar 71. As it passes through, the primary throttling action occurs as it enters the first throttling region 103a, which is a space between the collar 71 and the collar 72, and the pressure drops, and then the upper surface of the collar 72 and the cavity ( A second throttling action occurs while passing through the upper wall surface of the 103 to reach the second throttling region 103b, thereby causing a pressure drop.

As a result, the pressure-reduced oil fails to move toward the impeller on the right side of the drawing, and is recovered in the sump 58 via the communicating passage 57.

Of course, even if some oil is passed toward the seal member 200 is blocked by the centrifugal force of the seal member 200 that rotates at the same time as the rotary shaft 36 is no longer progressed and blocked as described above, the moving passage 130 Through the passage 57 is recovered to the sump (58).

In this case, a plurality of through holes 71a are formed in the collar 71 over the entire surface of the collar 71 and are dispersed due to the oil slinger 70 rotating as the oil passes through the through holes 71a. Furthermore, the discharge to the passage 57 becomes easy.

In addition, as shown in FIG. 10, through holes 72a may also be formed in the second collar 72 of the oil slinger 70 so that the oil may be further dispersed, and the collar 71 and the collar ( The through holes 71a and 72a arranged and formed at 72 are arranged to be offset from each other, so that the dispersion effect is further exerted.

On the other hand, as shown in Figure 11, it is possible to prevent the leakage of oil through the oil slinger 80 of another example.

In other words, the collar 81 formed at the tip of the oil slinger 80 is formed in a conical shape, and in accordance with this, a ramp 104a is formed at a corresponding position of the cavity 104 so that the moving oil is the collar 81. ), The oil is deposited on the collar 81 while the collar 81 is rotated at the same time as the rotation axis 36 rotates to be dispersed and moved through the ramp 104a.

At this time, the oil is recovered downward into the sump (58) through the passage (57), which is moved downward by gravity through the inclined path (104a) located below the rotating shaft (36).

On the other hand, the oil located on the upper portion of the rotary shaft 36 continues to move to the right while remaining in the drawing, the oil passing through the ramp 104a is dispersed while passing through a plurality of, formed through holes 104b along the semicircle circumference While entering the movement path 104c. Then, since the area of the movement path 104c is relatively larger than the passage hole 104b, throttling occurs and the pressure drops, and the oil whose pressure is dropped is communicated through the passage path 104d formed in the circumferential direction. Passed through the passage (57) to the sump (58).

In addition, as shown in FIG. 13, the same oil slinger 80 as the oil slinger 80 shown in FIG. 11 is formed, but the structure of the cavity 105 is different. In other words, the cavity 105 is formed with a ramp 105a which corresponds to the surface of the conical collar 81 of the oil slinger 80, and the oil past the ramp 105a is relatively wider than the ramp 105a. The pressure is lowered by the throttling action by entering the throttling region 105b so that the oil is naturally recovered through the passage 57 to the sump 58.

In addition, the throttling region 105b is formed with an inclined surface 105c so that the oil passing through the inclined path 105a is quickly moved down the inclined surface 105c.

In addition, as another embodiment of the present invention, as shown in Fig. 14, the ramp (106) for accommodating the oil slinger 80 having a conical collar 81, so as to correspond to the collar 81 ( 106a) is formed, the oil retaining groove 106b and the throttling area portion 106c are formed, and the oil passing through the ramp 106a temporarily stays in the retaining groove 106b and then moves to the throttling area portion 106c to throttle. The action occurs to move downward in the state where the pressure is lowered (down and down 36 of the rotary shaft 36), so that oil is recovered into the sump 58 via the passage 57.

In addition, a downwardly inclined surface 106d is formed at one upper side of the throttle region 106c, so that the oil passing through the staying groove 106b moves downward more rapidly and becomes a pressure drop.

In addition, the present invention, as shown in Figure 15, is provided with a cooling gas pipe 107 around the cavity 56 to flow the cooling gas therein to lower the ambient temperature, in particular the temperature in the cavity 56 Can lower the pressure of the oil entering the cavity 56. The oil, which has been pressure-falled in the cavity 56 by the cool gas pipe 107, no longer proceeds and moves downward and is recovered into the sump 58 through the passage 57.

In addition, the present invention, as shown in Figure 16, the rotating shaft 36 to rotate by forming a plurality of through holes (108a) in the circumferential surface of the cavity 108 formed around the collar 81 of the oil slinger 80 The oil dispersed by the collar 81 of the oil slinger 80, which rotates at the same time, is discharged through the plurality of through holes 108a to communicate with the passage 57 formed in the lower portion, and through the passage 57. Recovered to sump 58.

Furthermore, a pressurized hole 108b is formed between each of the plurality of through holes 108a to allow high pressure air to flow in, so that oil is more easily dispersed and discharged into the through holes 108a.

9 to 16, the structure of the oil slinger and the cavity of the other embodiment is illustrated and described, including the seal member 200 of the above-described embodiment, but is not limited thereto. Applicable.

Although the present invention has been described for the embodiments of the present invention based on the accompanying drawings for convenience, it is obvious that various modifications and changes are possible within the scope of the technical idea of the present invention.

1 is an overall cross-sectional view showing the structure of a conventional centrifugal compressor.

FIG. 2 is a partially enlarged cross-sectional view of FIG. 1.

3 is a cross-sectional view showing an oil leakage preventing structure according to the present invention.

4 is a perspective view in a state of cutting the oil leakage prevention structure according to the present invention.

Figure 5 is an enlarged cross-sectional view showing an embodiment of the seal member of the oil leakage preventing structure according to the present invention.

Figure 6 is an enlarged cross-sectional view showing another embodiment of the seal member of the oil leakage preventing structure according to the present invention.

Figure 7 is an enlarged cross-sectional view showing another embodiment of a seal member of the oil leakage preventing structure according to the present invention.

8 is a longitudinal sectional view of an oil leakage preventing structure according to the present invention.

9 is a cross-sectional view showing another embodiment of an oil slinger according to the present invention.

10 is a cross-sectional view showing yet another embodiment of an oil slinger according to the present invention.

11 is a sectional view showing another embodiment of an oil slinger according to the present invention.

12 is a partially cutaway perspective view of FIG. 11.

FIG. 13 is a cross-sectional view of another embodiment of a cavity for accommodating an oil slinger according to FIG. 11.

FIG. 14 is a sectional view of another embodiment of a cavity for accommodating an oil slinger according to FIG. 11.

15 is a cross-sectional view showing a state having a cooling gas pipe for reducing the pressure in the oil leakage prevention structure according to the present invention.

16 is a cross-sectional view showing another embodiment of the oil leakage prevention structure according to the present invention.

[Code Description in Drawings]

36: rotation axis

37 impeller

40: bearing

50,70,80: Oil Slinger

50a, 71,72

54: oil supply passage

56: joint

57: passage

58: sump

80a: by connection

81: color

100 casing

101: insertion hole

102: seal member

103: joint

103a: first throttle area

103b: second throttle zone

104: joint department

104a: ramp

104b: through hole

104c: moving road

104d: through hole

105: cavity

105a: ramp

105b: throttle area

105c: slope

106: joint department

106a: ramp

106b: Staying home

106c: throttle area

106d: slope

107: cooling gas pipe

108: joint department

108a: through hole

108b: pressure ball

110: space part

111,112: Through

120,130: Movement passage

200: seal member

210: seal end (triangle)

220: seal end (right triangle)

230: Seal end (mixed type)

Claims (19)

A rotating shaft 36 for rotating the impeller 37, a bearing 40 provided on the outer circumferential surface of the rotating shaft 36 to smoothly rotate the rotating shaft 36, and oil supplied to the bearing 40. A centrifugal compressor having an oil leakage preventing structure consisting of a sealing member 200 to prevent leakage of oil and a sump 58 for recovering supplied oil, The seal member 200 is provided to rotate together with the rotation shaft 36, the casing 100 surrounding the seal member 200 is formed with a space portion 110 to allow the rotation of the seal member 200 is formed. In addition, a plurality of through holes 111 are formed in the space 110, and a moving passage 120 is formed in a circumferential direction so as to communicate with the through holes 111, and communicates with the moving passage 120. A through-hole 112 is formed, and the mobile passage 130 communicates with the passage 57 through which oil is recovered to the sump 58 in which low pressure is formed while extending from the through-hole 112 so as to suck the oil. Centrifugal compressor having an oil leakage preventing structure, characterized in that formed. The method according to claim 1, An oil slinger is further provided on an outer circumferential surface of the rotating shaft 36, and the seal member 200 is fixed to an outer circumferential surface of the oil slinger so that the seal member 200 can be rotatable together. The method according to claim 1, The seal member 200 is a labyrinth seal member, the centrifugal compressor having an oil leakage preventing structure, characterized in that a plurality of seal end portions 210 of the upper and lower symmetry of the center can be formed in a plurality arranged. The method according to claim 1, The seal member 200 is a centrifugal compressor having an oil leakage preventing structure, characterized in that the seal end portion 220 of the right triangle which is vertically symmetrical around the center can be formed in a plurality. The method according to claim 1, The seal member 200 is a centrifugal compressor having an oil leakage preventing structure, characterized in that the seal end portion 230 of the upper and lower symmetrical triangle and the right triangle with respect to the center can be formed in a plurality arranged. The method according to claim 1, Centrifugal compressor having an oil leakage prevention structure, characterized in that the toothed seal member 102 is provided on the inner surface of the insertion hole 101 of the casing 100. The method according to claim 2, In the oil slinger, two collars 71 and 72 are formed at intervals at the tip, and the first and second throttle regions 103a and 103b are formed in the cavity 103 in which the collars 71 and 72 are accommodated. Centrifugal compressor having an oil leakage prevention structure, characterized in that is formed. The method of claim 7, Centrifugal compressor having an oil leakage prevention structure, characterized in that the through hole is formed in at least one of the collar (71) (72) of the oil slinger. The method according to claim 8, The through-holes formed in all of the collars (71) (72) of the oil slinger are arranged, offset each other, the centrifugal compressor having an oil leakage preventing structure. The method according to claim 2, A conical collar 81 is formed at the tip of the oil slinger, and the cavity 104 of the casing 100 is formed to correspond to the inclined surface of the collar 81 to conform to the collar 81. And, the through-hole 104b is formed in a plurality so that the oil moved through the inclined path (104a), and the oil moved while being connected to the through-hole (104b) is formed to move downward, move while the pressure drop is made The passage 104d, the passage passage 104d formed in the circumferential direction while communicating with the movement passage 104c, and communicating with the passage passage 80a formed on the circumferential surface of the oil slinger 80; It passes through the passageway (104d) formed in the lower portion of the rotary shaft 36 via 80a) and connected to the moving passageway 130 communicating with the space portion 110 in which the seal member 200 is accommodated, and sump through the passageway 57. Centrifugal compressor having an oil leakage prevention structure, characterized in that the oil is recovered to (58) . The method according to claim 10, The passage hole (104b) and the moving path (104c) is a centrifugal compressor having an oil leakage prevention structure, characterized in that formed in the upper semi-circular portion of the rotating shaft (36). The method according to claim 10, The moving path (104c) is a centrifugal compressor having an oil leakage prevention structure, characterized in that it has a relatively wider area than the through hole (104b) while forming a stepped structure so that the pressure drop of the oil by the throttling action. The method according to claim 2, The cavity portion 105 in which the conical collar 81 formed at the tip of the oil slinger is accommodated, To the ramp 105a to correspond to the inclined surface of the collar 81, and to the throttle region 105b to form a relatively wider area than the ramp 105a so that oil is moved from the ramp 105a to lower the pressure. The cavity portion 105 is connected to the sump 58 at the lower portion of the rotary shaft 36 to connect with the passage 57 for collecting oil and the lower movement passage 130 of the seal member 200. A centrifugal compressor having an oil leakage preventing structure. 14. The method of claim 13, Centrifugal compressor having an oil leakage prevention structure, characterized in that the inclined surface 105c inclined downward so that the oil can move quickly in the upper portion of the cavity (105). The method according to claim 2, The cavity 106 in which the conical collar 81 of the oil slinger is received, The inclined path 106a to correspond to the inclined surface of the collar 81, the dwelling groove 106b for temporarily retaining the oil moved from the inclined path 106a, and falling downward through the dwelling groove 106b. It consists of a throttling region (106c) formed in a relatively large area so that the pressure drops, The cavity 106 is connected to the sump 58 at the lower portion of the rotating shaft 36 to recover the oil, and the oil is characterized in that it is connected to the lower movement passage 130 of the seal member 200. Centrifugal compressors with a leakproof structure. The method according to claim 15, Centrifugal compressor having an oil leakage prevention structure, characterized in that the inclined surface (106d) is inclined downward so that the oil can move downward quickly in the upper portion of the throttling region (106c) of the cavity (106). The method according to claim 2, The oil leakage, characterized in that the cooling gas pipe 107 is arranged in the casing 100 so that the cooling gas flows corresponding to the cavity forming range to lower the pressure of the oil in the cavity. Centrifugal compressors with a preventive structure. The method according to claim 2, When the collar of the oil slinger rotates at the same time as the rotation of the rotary shaft 36, the introduced oil is dispersed and discharged so as to return to the sump 58 past the passage 57 formed in the lower portion of the rotary shaft 36 ( Centrifugal compressor having an oil leakage preventing structure, characterized in that a plurality of through holes (108a) is formed around the periphery (108). 19. The method of claim 18, Oil leakage prevention structure, characterized in that between the through holes (108a) can be formed in the pressure hole (108b) to accelerate the oil flowing into the cavity 108 to be quickly discharged into the through hole (108a) Centrifugal compressor having a.

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