KR20100078697A - Centrifugal compressor having structure for preventing oil likeage - Google Patents

Abstract

PURPOSE: A centrifugal compressor with an oil leakage preventing structure is provided to effectively prevent an oil leak by changing the structure of an oil slinger and strengthening pressure. CONSTITUTION: A centrifugal compressor with an oil leakage preventing structure comprises a rotary shaft(36), bearings(40), an oil slinger(70), and a sump(58). The rotary shaft rotates an impeller. The bearings are arranged on the outer surface of the rotary shaft and rotate the rotary shaft. The oil slinger is coupled on the outer surface of the rotary shaft in order to prevent oil supplied to the bearings from leaking. The sump collects the supplied oil.

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 an oil slinger to lower the pressure to prevent oil leakage, and to change the structure of the sealing member to prevent oil leakage. It is to prevent even more.

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, by changing the structure of the oil slinger to prevent the leakage of the oil supplied to drop the pressure effectively prevent leakage of oil, additionally seal By changing the structure of the member, it is possible to more reliably block the leakage of oil.

The present invention is a rotating shaft for rotating the impeller, the bearing is provided on the outer circumferential surface of the rotating shaft to smoothly rotate the rotating shaft, and coupled to the outer circumferential surface of the rotating shaft to prevent the leakage of oil supplied to the bearing at the same time as the rotating shaft A centrifugal compressor having an oil leak prevention structure consisting of a rotatable oil slinger and a sump for recovering supplied oil,

The oil slinger is characterized in that a plurality of collars are formed at intervals while being radially and outwardly extending so as to be rotatable in the cavity.

The oil slinger is formed with two collars at intervals at the tip, and the first and second parts having a relatively wider area than the gap formed between the collar end and the cavity of the oil slinger in the cavity where the collar is accommodated. It is a structure in which throttling regions are formed.

In addition, a plurality of through holes may be arranged and formed in at least one of the collars of the oil slinger.

In addition, the through-holes formed in both the collar of the oil slinger may be arranged, formed to be offset from each other.

In addition, a conical collar is formed at the tip end of the oil slinger, and the cavity of the casing to correspond to the collar, a ramp formed to correspond to the inclined surface of the collar, and a plurality of passage holes formed so that the oil moved through the ramp is introduced. , A passageway in which the oil moved while being connected with the passage hole is formed to move downward and downward as the pressure drop is made; And it is connected to the moving passage communicating with the space portion in which the seal member is received through the passage formed in the lower portion of the rotary shaft via the connecting passage is a structure in which the oil is recovered to the sump through the passage.

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

In addition, the moving path is a structure having a relatively wider area than the through hole while forming a stepped structure so that the pressure drop of the oil by the throttling action.

In addition, the cavity in which the conical collar formed at the tip of the oil slinger is accommodated, the ramp to correspond to the inclined surface of the collar, and the throttle to form a relatively wider area than the ramp so that the oil is moved from this ramp to lower the pressure Comprising an area, the cavity is connected to the sump at the lower portion of the rotating shaft to recover the oil and the structure is connected to the lower movement passage of the seal member.

In addition, the upper portion of the cavity is a structure that can be formed inclined downward inclined surface so that the oil can move quickly.

In addition, 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 retention groove for temporarily moving oil from the ramp, and a pressure dropping downward through the retention groove. It consists of a throttling zone formed in a relatively wide area so that it falls

In addition, the cavity is connected to the sump at the lower portion of the rotating shaft to recover the oil and the structure connected to the lower movement passage of the seal member.

In addition, the top of the throttling region of the cavity portion has a structure in which the inclined surface inclined downward so that the oil can move downward quickly.

In addition, 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.

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

In addition, the pressurizing hole is formed between the through holes to accelerate the oil flowing into the cavity to be quickly discharged into the through holes.

In addition, the present invention is provided so that the seal member is rotated together with the rotating shaft, the casing surrounding the seal member is formed with a space to allow the rotation of the seal member, a plurality of through holes are formed in the space portion, the through A moving passage is formed in the circumferential direction so as to communicate with the through hole, and a through hole is formed to communicate with the moving passage. It is a structure in which a moving passage is formed so that it can be made.

In addition, the seal member is coupled to the outer circumferential surface of the oil slinger to be rotated together with the rotation shaft, the casing surrounding the seal member is formed with a space for the rotation of the seal member is formed, the space portion is formed with a plurality of through holes , A moving passage is formed in the circumferential direction to communicate with the through hole, a through hole is formed to communicate with the moving passage, and extends from the through hole to communicate with the passage for recovering the oil to the sump which is formed at low pressure. It is a structure formed with a moving passage to suck the.

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 sealing member.

As described above, the present invention is to change the structure of the oil slinger to lower the pressure of the incoming oil, thereby essentially preventing the leakage of oil. Moreover, the sealing member is coupled to the oil slinger to be rotatable with the rotating shaft to be sucked in. It is effective to prevent the leakage of oil even more by the method.

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, the present invention includes a rotary shaft 36 for rotating the impeller 37 (see FIG. 2) and an outer circumferential surface of the rotary shaft 36 to smoothly rotate the rotary shaft 36. And an oil slinger 70 which is coupled to an outer circumferential surface of the rotary shaft 36 so as to prevent leakage of oil supplied to the bearing 40, and is rotatable simultaneously with the rotary shaft 36. A centrifugal compressor having an oil leakage preventing structure consisting of a sump 58 for recovering oil,

The oil slinger 70 has a structure in which a plurality of collars 71 and 72 are formed at intervals while being radially extended outwardly so as to be rotatable in the cavity 110 formed in the casing 100.

In the oil slinger 70, two collars 71 and 72 are formed at intervals at the distal end thereof, and the first and second throttle regions 111 and the second cavity portion 71 are formed in the cavity in which the collars 71 and 72 are accommodated. 112) is formed.

The first and second throttle regions 111 and 112 are relatively wider than the gaps 110a and 110b formed between the ends of the collars 71 and 72 of the oil slinger 70 and the cavity 110. By having an area, a pressure drop is generated.

 In addition, as shown in FIG. 4, a plurality of through holes 71a and 72a may be arranged and formed in at least one of the collars 71 and 72 of the oil slinger 70. In other words, a through hole may be formed in any one of the collars 71 and 72, and a through hole may be formed in both the collars 71 and 72.

The through holes 71a and 72a formed in both the collars 71 and 72 of the oil slinger 70 may be arranged and formed to be offset from each other. In other words, when the virtual horizontal line passes through the through hole, the through holes 71a and 72a are arranged so as not to coincide.

In addition, as another embodiment of the present invention, as shown in Figure 5, the front end of the oil slinger 80 is formed with a conical collar 81, so as to match the collar 81 of the casing 100 The cavity portion 120 includes a ramp 121 formed so as to correspond to an inclined surface of the collar 81, a plurality of passage holes 122 formed so that oil moved through the ramp 121 is introduced, and the passage hole ( The moving oil is connected to the 122 and the moving path 123 is formed to move downward, the pressure drop is made, and in communication with the moving path 123 is formed in the circumferential direction on the circumferential surface of the oil slinger 80 The space part in which the seal member 200 is accommodated is passed through the passage passage 124 communicating with the connection passage 80a to be formed and the passage passage 124 formed at the lower portion of the rotary shaft 36 via the connection passage 80a. It is connected to the moving passage 310 in communication with the 300 and the oil is recovered in the sump (58) via the passage (57) fasten.

The through hole 122 and the movement path 123 is a structure that can be formed in the upper semi-circular portion of the rotary shaft 36.

The movement path 123 is a structure having a relatively large area compared to the through-hole 122 while forming a structure in which a step is formed so that the pressure drop of the oil by the throttling action.

In addition, according to another embodiment of the present invention, as shown in FIG. 7, the cavity 130 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 132 that forms a larger area than the ramp 131 so that oil is moved from the ramp 131 so that the pressure drops. 130 is connected to the sump 58 at the lower portion of the rotary shaft 36 to connect with the passage 57 for recovering oil and the lower movement passage 310 of the seal member 200.

The upper portion of the cavity 130 has a structure in which the inclined surface 133 is inclined downward so that the oil can move quickly.

In addition, according to another embodiment of the present invention, the cavity 140 in which the conical collar 81 of the oil slinger 80 is accommodated may include an inclined path 141 that corresponds to an inclined surface of the collar 81. It consists of a retention groove 142 that allows oil moved from the ramp 141 to temporarily stay, and a throttling region 143 formed in a relatively wide area so that the pressure drops while falling downward through the retention groove 142. under,

The cavity 140 is connected to the sump 58 at the lower portion of the rotating shaft 36 to connect with the passage 57 for recovering oil and the lower movement passage 310 of the seal member 200.

The inclined surface 144, which is inclined downward, may be formed on the upper portion of the throttling region 143 of the cavity 140 so that the oil moves downward quickly.

In addition, as another embodiment of the present invention, as shown in Figure 9, the inner circumference of the casing 100 so that the cooling gas flows while corresponding to the forming range of the cavity 110, the oil in the cavity 110 Cool gas pipe 150 to lower the pressure of the structure may be provided is arranged, it is connected to the conduit 44 of the refrigerant gas shown in FIG.

 The cooling gas pipe 150 is applicable to all other embodiments. In other words, for convenience, the cavity 110 and the oil slinger 70 are representatively shown and described for convenience, but are applicable to both the oil slinger and the cavity of another embodiment.

In addition, as another embodiment of the present invention, as shown in Figure 10, when the collar 81 of the oil slinger 80 rotates at the same time as the rotation of the rotary shaft 36, the introduced oil is discharged while being dispersed A plurality of through holes 161 are formed around the cavity 160 to be recovered to the sump 58 through the passage 57 formed at the lower portion of the rotation shaft 36.

A pressure hole 162 may be formed between the through holes 161 to accelerate the oil introduced into the cavity 160 to be quickly discharged into the through holes 161.

Meanwhile, the present invention may further include an improved seal member in the structure of the oil slinger and the cavity for accommodating the oil slinger as described above with reference to FIGS. 3 to 10.

The seal member 200 illustrated in FIGS. 3 to 9 is integrally coupled and fixed to the outer circumferential surface of the oil slinger 70 so as to rotate together with the rotation shaft 36.

For a detailed description of the seal member 200, first, the space 300 is formed in the casing 100 surrounding the seal member 200 to rotate the seal member 200 in FIGS. 3 and 11. A plurality of through holes 301 are formed in the space part 300, and a moving passage 302 is formed in a circumferential direction so as to communicate with the through holes 301, and communicates with the moving passage 302. A through hole 303 is formed, and a moving passage 310 which communicates with the passage 57 for allowing oil to be recovered to the sump 58 in which low pressure is formed while extending from the through hole 303 is capable of sucking the oil. Formed structure.

In addition, the seal member 200 is a labyrinth seal member, a structure in which a plurality of seal end portions 210 of a triangle which are symmetrical up and down around a center thereof may be formed.

In addition, the seal member 200 is a structure in which a plurality of seal end portions 220 of right and right symmetrical triangles, which are symmetrical with respect to the center thereof, may be arranged as another example, as illustrated in FIG. 12.

In addition, as the seal member 200 as another example, as shown in FIG. 13, a plurality of seal end portions 230, which are upper and lower symmetrical triangles and right triangles, are arranged in a plurality and arranged as shown in FIG. It is a structure that can be.

In addition, the inner surface of the insertion hole 101 of the casing 100 is a structure that can be provided with a sealing member (102). The seal member 102 may be formed in a sawtooth type.

In the present invention having such a configuration, as shown in FIG. 3, the oil is supplied through the oil supply passage 54 and moved to the right side in the drawing as it flows into the bearing 40. When the rotating shaft 36 for rotating 37 (shown in FIG. 1 or 2) is rotated, the oil slinger 70 coupled to the outer circumferential surface of the rotating shaft 36 also rotates simultaneously.

Thus, when the oil is about to move towards the cavity 56, it is withdrawn by the collars 71, 72 of the rotating oil slinger 70 and withdrawn to the sump 58 via a passage 57 located below. .

Here, the present invention, as shown in Figures 3 to 10, by varying the structure of the oil slinger and the cavity can be lowered the pressure of the oil to be introduced so that the oil can prevent leakage.

Specifically, as shown in FIG. 3, first, two collars 71 and 72 are formed in the oil slinger 70 so that the pressure drop of the moving oil can be prevented, thereby preventing leakage of oil. have.

More specifically, the collars 71 and 72 are formed to be spaced apart from each other, the oil moving through the bearing 40 flows into the cavity 110 in which the collars 71 and 72 are disposed. . At this time, while the rotating shaft 36 rotates at high speed, the oil slinger 70 also rotates at the same time, so that the tip of the collar 71 and the upper wall surface of the cavity 110 are rotated as the collar 71 rotates. As the oil passes through and enters the first throttling region 111, which is a space between the collar 71 and the collar 72, a primary throttling action occurs to decrease the pressure, and then the cavity of the upper surface of the collar 72. A second throttling action occurs while passing through the upper wall surface of the part 103 to reach the second throttling region 112, and a pressure drop occurs.

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. 4, 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, wherein 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 5, it is possible to prevent the leakage of oil by lowering the pressure of the oil through the oil slinger 80 of another example.

Specifically, the collar 81 formed at the tip of the oil slinger 80 is formed in a conical shape, so that the corresponding slope of the cavity portion 120 is formed to correspond to this, the oil is moving the collar When it comes in contact with the 81, the oil on the collar 81 is dispersed and moved through the inclined path 121 while the collar 81 rotates at the same time as the rotation shaft 36 rotates.

At this time, the oil is recovered downward into the sump (58) through the passage (57) communicated by the downward movement by gravity through the inclined path 121 located below the rotating shaft (36).

On the other hand, the oil located in the upper portion of the rotary shaft 36 continues to remain in the drawing to move to the right, the oil passing through the ramp 121 is dispersed while passing through a plurality of, formed through holes 122 along the semicircle circumference While entering the moving path (123). Then, since the area of the movement path 123 is relatively larger than the passage hole 122, a throttling action is generated to reduce the pressure, and the oil whose pressure is dropped is communicated through the passage 124 formed in the circumferential direction. Passed through the passage (57) to the sump (58).

In addition, the present invention is the same oil slinger 80 as the oil slinger 80 shown in Figure 5, as shown in Figure 5, but the structure of the cavity 130 is different. In other words, the cavity 130 is formed with a ramp 131 to correspond to the surface of the conical collar 81 of the oil slinger 80, and the oil past the ramp 131 is relatively wider than the ramp 131. The pressure is reduced by entering the throttling zone 132 and the oil is naturally recovered through the passage 57 to the sump 58.

In addition, the throttling region 132 is formed with an inclined surface 133 so that the oil passing through the inclined path 131 can be quickly descended and moved on the inclined surface 133.

In addition, as another embodiment of the present invention, as shown in Figure 8, the inclined ramp so that the cavity 140 for receiving the oil slinger 80 having a conical collar 81, corresponding to the collar 81 141 is formed, the oil has passed through the ramp 141 is formed in the dwelling groove 142 and the throttling region 143 is temporarily stayed in the dwelling groove 142 is moved to the throttling region 143 to throttle This causes the oil to move downward (downward of the rotating shaft 36) in a state where the pressure is lowered, and oil is recovered into the sump 58 via the passage 57.

In addition, the inclined surface 144 is inclined downward on the upper side of the throttling region 143, so that the oil passing through the staying groove 142 moves downward more rapidly and becomes a pressure drop.

In addition, the present invention, as shown in Figure 9, is provided with a cooling gas pipe 150 around the inside of the cavity 110 to flow the cooling gas therein to the ambient temperature, in particular, the temperature in the cavity 110 The pressure of the oil entering the cavity 110 can be lowered. The oil, which has been pressure-reduced in the cavity 110 by the cooling gas pipe 150, may not proceed any further, and may move downward and be recovered into the sump 58 through the passage 57.

In addition, the present invention, as shown in Figure 10, the rotating shaft 36 to rotate by forming a plurality of through holes 161 on the circumferential surface of the cavity 160 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 161 to communicate with the passage 57 formed in the lower portion, and then through the passage 57. Recovered to sump 58.

In addition, the pressurizing holes 162 are formed between the plurality of through-holes 161, respectively, so that high-pressure air flows in to allow the oil to be dispersed and discharged to the through-holes 161 more easily.

The structure of the oil slinger and the cavity of the various embodiments illustrated in FIGS. 3 to 10 is illustrated and described, including the seal member 200 of the above-described embodiment, but is not limited thereto. Applicable.

On the other hand, the oil by the oil slinger described through the embodiments to reduce the pressure of the oil to prevent the leakage of oil, but because it can not be guaranteed to completely prevent the leakage of oil, the space portion 300 of the casing 100 It is located in the) and coupled to the outer peripheral surface of the oil slinger, it is possible to prevent the leakage of oil more completely by the sealing member 200 is fixed.

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, although the pressure-high oil tries to move through the seal member 200, the oil pressure drops primarily by the oil slinger and the cavity of the above embodiments. Since a small amount of oil may move, in this case, the seal member 200 coupled to the outer circumferential surface of the oil slinger is rotated at the same time as the rotation shaft 36 rotates, thereby dispersing the oil by centrifugal force. The oil to be dispersed, as shown in FIG. 14, exits through the plurality of, formed through holes 301 in the space part 300 of the casing 100, and then moves through the moving passage 302 formed in the circumferential direction. It is discharged through the through-hole 303 formed in the lower portion.

At this time, the through hole 301 is in communication with the moving passage 302 formed through the casing 100 surface so that the oil discharged through the through hole 301 moves through the moving passage 302, the moving passage 302 is again connected in communication with the passage 57 and 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 in communication with the moving passage (302) passing through the casing (100). Since the oil introduced into the space 300 of the 100 is introduced 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 11 to Figure 13, the seal end portion 210 to form an upper, lower triangle with respect to the center and, based on 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 triangular seal end 210, the oil present in the seal end 210 is rotated outwardly by the action of centrifugal force as the seal end 210 rotates simultaneously with the rotation of the rotary shaft 36. When dispersed, each seal end 210 is formed in a triangle so that 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 through the through hole 301. Is discharged.

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.

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 embodiment of an oil leakage prevention structure according to the present invention.

Figure 4 is a cross-sectional view showing another embodiment of the oil leakage prevention structure according to the present invention.

Figure 5 is a cross-sectional view showing another embodiment of the oil leakage prevention structure according to the present invention.

6 is a partially cutaway perspective view of FIG. 5.

Figure 7 is a cross-sectional view showing another embodiment of the oil leakage prevention structure according to the present invention.

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

Figure 9 is a sectional view showing another embodiment of the oil leakage prevention structure according to the present invention.

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

11 is a cross-sectional view showing an embodiment of a seal member that is an oil leakage preventing structure according to the present invention.

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

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

14 is a longitudinal cross-sectional view of FIG.

[Code Description in Drawings]

36: rotation axis

37 impeller

40: bearing

54: oil supply passage

56: joint

57: passage

58: sump

70,80: Oil Slinger

71,72,81: color

71a, 72a: Through hole

80a: by connection

100 casing

101: insertion hole

102: seal member

110: joint

110a, 110b: gap

111: first throttling area

112: second throttle area

120: common part

121: ramp

122: through hole

123: moving path

124: passage

130,140,160: Joint Department

131,141: ramp

132,143: throttle area

133,144: slope

142: Residency Home

150: cooling means

161: through hole

162: pressure ball

200: seal member

210: seal end (triangle)

220: seal end (right triangle)

230: Seal end (mixed type)

300: space part

301: through hole

302: moving passage

303: through

310: moving passage

Claims (20)

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. An oil leakage prevention structure consisting of an oil slinger 70 coupled to an outer circumferential surface of the rotating shaft 36 and rotatably coupled with the rotating shaft 36 to prevent leakage of oil, and a sump 58 for recovering the supplied oil. Branch centrifugal compressor, The oil slinger 70 is a centrifugal having an oil leakage preventing structure, characterized in that a plurality of collars are formed at intervals while being radially extended outwardly so as to be rotatable in the cavity 110 formed in the casing 100. compressor. The method according to claim 1, The oil slinger 70 is formed with two collars 71 and 72 at intervals at the tip, and the collar 110 of the oil slinger 70 is provided in the cavity 110 in which the collars 71 and 72 are accommodated. The first and second throttle regions 111 and 112 having a relatively larger area than the gaps 110a and 110b formed between the end portions 71 and 72 of the cavity 110 are formed. Centrifugal compressor having an oil leakage prevention structure. The method according to claim 2, Centrifugal compressor having an oil leakage preventing structure, characterized in that a plurality of through holes (71a) (72a) can be arranged, formed in at least one of the collar (71) (72) of the oil slinger (70). The method according to claim 3, Centrifugal compressor having an oil leakage preventing structure, characterized in that the through-holes (71a) (72a) formed in both of the collar (71) (72) of the oil slinger (70) can be arranged to be offset from each other. 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. An oil leakage prevention structure consisting of an oil slinger 80 coupled to an outer circumferential surface of the rotary shaft 36 to prevent simultaneous leakage of the rotary shaft 36 and rotatable simultaneously with the rotary shaft 36, and a sump 58 for recovering the supplied oil. Branch centrifugal compressor, A conical collar 81 is formed at the tip of the oil slinger 80, and the cavity 120 in the casing 100 corresponds to the inclined surface of the collar 81 so as to correspond to the collar 81. (121), the passage hole 122 is formed to a plurality of oil to be moved through the ramp 121, and the oil moved while being connected to the passage hole 122, the pressure drop is made downward, move A moving path 124 formed to be in communication with the moving path 123 formed in the circumferential direction and communicating with the connection path 80a formed on the circumferential surface of the oil slinger 80 and communicating with the moving path 123; Centrifugal having an oil leakage prevention structure, characterized in that the oil is recovered to the sump (58) through the passage (57) through the passage (124) formed in the lower portion of the rotary shaft 36 via the connecting passage (80a) compressor. The method according to claim 5, The passage hole 122 and the moving path 123 is a centrifugal compressor having an oil leakage prevention structure, characterized in that formed in the upper semi-circular portion of the rotary shaft 36. The method according to claim 5, The moving path 123 is a centrifugal compressor having an oil leakage preventing structure, characterized in that it has a relatively wider area than the through-holes 122 while forming a stepped structure so that the pressure drop of the oil by the throttling action. 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. An oil leakage prevention structure consisting of an oil slinger 80 coupled to an outer circumferential surface of the rotary shaft 36 to prevent simultaneous leakage of the rotary shaft 36 and rotatable simultaneously with the rotary shaft 36, and a sump 58 for recovering the supplied oil. Branch centrifugal compressor, A conical collar 81 is formed at the tip of the oil slinger 80, and the cavity 130 in the casing 100 in which the collar 81 is accommodated is an inclined path corresponding to the inclined surface of the collar 81. 131 and an throttling region 132 forming a relatively wider area than the ramp 131 so that oil is moved from the ramp 131 to lower the pressure, and the cavity 130 is a rotation shaft. Centrifugal compressor having an oil leakage prevention structure, characterized in that connected to the sump (58) at the lower portion of the 36 connected to the passage (57) for recovering oil. The method according to claim 8, Centrifugal compressor having an oil leakage prevention structure, characterized in that the inclined surface 133 is inclined downward so that the oil can move quickly in the upper portion of the cavity (130). 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. An oil leakage prevention structure consisting of an oil slinger 80 coupled to an outer circumferential surface of the rotary shaft 36 to prevent simultaneous leakage of the rotary shaft 36 and rotatable simultaneously with the rotary shaft 36, and a sump 58 for recovering the supplied oil. Branch centrifugal compressor, A conical collar 81 is formed at the tip of the oil slinger 80, and the cavity 140 in the casing 100 in which the collar 81 is accommodated corresponds to the inclined surface of the collar 81. A ramp 141, a retention groove 142 for temporarily moving the oil moved from the ramp 141, and a relatively wide area so that the pressure drops while passing downward through the retention groove 142 It consists of a throttling area 143, The cavity 140 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 310 of the seal member 200 Centrifugal compressors with a leakproof structure. The method according to claim 10, Centrifugal compressor having an oil leakage prevention structure, characterized in that the inclined surface 144 is inclined downward to the top of the throttling region (143) of the cavity (140) to move downward quickly. The method according to any one of claims 1,5,8,10, An oil leakage may be provided in the casing 100 so that the cooling gas pipe 150 may be arranged to correspond to the cavity forming range and to lower the pressure of the oil in the cavity. Centrifugal compressors with a preventive structure. The method according to any one of claims 1,5,8,10, 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 prevention structure, characterized in that a plurality of through holes 161 are formed around the 160. 14. The method of claim 13, Oil leakage prevention structure, characterized in that the pressure hole 162 may be formed between the through holes 161 to accelerate the oil flowing into the cavity 160 to be quickly discharged into the through holes 161. Centrifugal compressor having a. The method according to any one of claims 1,5,8,10, Centrifugal compressor having an oil leakage prevention structure, characterized in that the sealing member 200 is integrally coupled and fixed to the outer peripheral surface of the oil slinger to rotate together with the rotating shaft (36). The method according to claim 15, The casing 100 surrounding the seal member 200 is formed with a space portion 300 to allow the rotation of the seal member 200, and a plurality of through holes 301 are formed in the space portion 300. A moving passage 302 is formed in a circumferential direction so as to communicate with the through hole 301, and a through hole 303 is formed to communicate with the moving passage 302, and a low pressure is extended from the through hole 303. A centrifugal compressor having an oil leakage preventing structure, characterized in that a communication passage (310) is formed in communication with the passage (57) to allow oil to be recovered to the sump (58) to be formed. 18. The method of claim 16, 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. 18. The method of claim 16, 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. 18. The method of claim 16, The seal member 200 is a centrifugal compressor having an oil leakage prevention structure, characterized in that the seal end portion 230, the upper and lower symmetrical triangle and the right triangle is mixed with a plurality of, arranged in the center. The method according to claim 15, Centrifugal compressor having an oil leakage prevention structure, characterized in that the sealing member 102 is further provided on the inner surface of the insertion hole 101 of the casing (100).

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