TWI386611B - Oil free lubrication centrifugal refrigerant compressor and lubrication method thereof - Google Patents

Description

Oil-free lubricating centrifugal refrigerant compressor and lubrication method thereof

The present invention relates to a centrifugal refrigerant compressor and a lubricating method thereof. More specifically, the present invention relates to an oil-free lubricating centrifugal refrigerant compressor that does not use lubricating oil to lubricate the rotating shaft and a lubricating method thereof.

For a pressurizing device such as a centrifugal compressor, the impeller is driven by a rotating shaft and matched with a member such as a scroll, and the fluid can be worked on while the fluid (for example, refrigerant, air, water, etc.) is sucked, thereby achieving The effect of pressurizing and transporting fluids. The key to improving the performance of the compressor is how to provide proper lubrication and support for the shaft so that it can rotate stably and quickly. Therefore, various bearing designs appear accordingly.

A centrifugal compressor disclosed in U.S. Patent No. 7,240,515 is a magnetic bearing type compressor which suspends a rotating shaft in a compressor through a magnetic force so that the rotating shaft can be maintained in an appropriate position when rotated. Friction with surrounding components. However, the output of the magnetic force sufficient to support the shaft must consume a considerable amount of electrical energy, and the output power of the magnetic force must be achieved by a precise control system. The precise control system not only increases the manufacturing cost of the compressor, but also consumes it. More electric energy, therefore, the magnetic bearing type of compressor not only does not meet the energy saving trend of the compressor design, but also increases the user's use burden.

Further, in the U.S. Patent No. 6,176,092, a ball-bearing type compressor is disclosed which provides a shaft supporting force by means of a ball and replaces a conventional lubricating oil with a liquid refrigerant and serves as a lubrication between the ball and the rotating shaft. The agent avoids the environmental pollution caused by the lubricating oil and the pollution of the refrigerant (the lubricating oil pollutes the refrigerant and reduces the thermal efficiency of the refrigerant); and in the U.S. Patent No. 5,902,049, an elastic dynamic pressure bearing is disclosed. The shaft supporting force is provided by filling a buffer layer between the rotating shaft and the outer wall of the rotating shaft, and the elasticity of the buffer layer is utilized to reduce the probability of damage to the rotating shaft. However, the use of liquid refrigerant as a lubricant can avoid the environmental pollution caused by the lubricating oil. However, since the viscosity of the liquid refrigerant is usually insufficient for the ball, the shaft of the ball bearing type compressor cannot be provided as a lubricating oil. The good lubrication effect makes it easy for the balls and the rotating shaft of the ball bearing type compressor to be improperly worn, thereby improving the failure probability of the ball bearing type compressor. Secondly, although the buffer layer laid between the rotating shaft and the outer wall of the rotating shaft can reduce the probability of damage to the rotating shaft, the buffer layer will increase the damping coefficient between the rotating shaft and the shaft tube, so that the elastic dynamic pressure bearing cannot be applied to the high-speed compression. In the machine, the practicality is greatly reduced.

In view of this, how to provide an oil-free lubricating centrifugal refrigerant compressor and a lubricating method thereof, not only do not need to use lubricating oil as a lubricant of the rotating shaft, but also maintain the shaft stably and at high speed without adding extra electric energy. Rotation is a topic that needs to be solved urgently.

To achieve the above and other objects, the present invention provides an oil-free lubricating centrifugal refrigerant compressor for compressing a low-pressure refrigerant into a high-pressure refrigerant, comprising: a casing; a refrigerant flow passage connecting the casing, including a first flow path into which the low-pressure refrigerant flows and a second flow path for discharging the high-pressure refrigerant; the compression module is disposed in the housing, and has a rotating shaft and a compression member and a driving member connected to the rotating shaft for transmitting The driving member drives the rotating shaft to rotate to drive the compression member to compress the low-pressure refrigerant into the high-pressure refrigerant, wherein the outer side of the rotating shaft has a fixed outer wall covering the rotating shaft; and the radial bearing is disposed on the fixed outer wall Between the rotating shaft and the rotating shaft, the inner surface of the radial bearing and the surface of the rotating shaft and the outer surface of the radial bearing and the fixed outer wall have a gap, and the diameter The bearing has at least one through hole communicating with the outer peripheral surface thereof to the surface of the rotating shaft; the first introducing member is disposed in the housing and communicates to the through the fixed outer wall a surface of the bearing for introducing a lubricating refrigerant fluid to the surface of the radial bearing, and the lubricating refrigerant fluid also flows into the surface of the rotating shaft through the through hole of the radial bearing for the compression module Providing lubrication between the radial bearing and the fixed outer wall and between the radial bearing and the rotating shaft; a plurality of collecting grooves respectively disposed at two ends of the radial bearing and communicating with the gap for And collecting the lubricating refrigerant fluid introduced into the radial bearing and the surface of the rotating shaft through the first introducing member; and the first discharging member is connected to the collecting tank for the lubricating refrigerant fluid in the collecting tank The collection tank is discharged.

In an embodiment of the present invention, an axial bearing disposed between one end of the rotating shaft and the fixed outer wall is further included, and the first introducing member faces the surface of the axial bearing for lubricating the lubricating refrigerant. Introducing a fluid to the surface of the axial bearing to provide lubrication between the axial bearing and the rotating shaft and lubrication between the axial bearing and the fixed outer wall when the compression module is actuated; The circumference of the axial bearing for collecting The first introduction member is introduced into the lubricating refrigerant fluid on the surface of the axial bearing.

Secondly, in order to achieve the above and other objects, the present invention also provides a lubricating method for an oil-free lubricating centrifugal refrigerant compressor, which is used for lubricating a rotating shaft of an oil-free lubricating centrifugal refrigerant compressor and a fixed outer wall covering the rotating shaft. The method includes the following steps: (1) arranging a radial bearing having at least a consistent perforation between the fixed outer wall and the rotating shaft so as to rotatably cover the rotating shaft, and the inner surface of the radial bearing and the radial bearing a gap between the surfaces of the rotating shaft and the outer surface of the radial bearing and the fixed outer wall, and the through hole communicates with the outer peripheral surface of the radial bearing to the surface of the rotating shaft; and (2) the refrigerant fluid for lubrication Passing through the fixed outer wall and introducing to the surface of the radial bearing, and flowing through the through hole of the radial bearing into the surface of the rotating shaft to provide between the radial bearing and the fixed outer wall when the rotating shaft is actuated Lubrication between the radial bearing and the shaft.

In an embodiment of the present invention, the step (1) includes the step of providing an axial bearing between one end of the rotating shaft and the fixed outer wall. And the step (2) further includes passing the lubricating refrigerant fluid through the fixed outer wall and introducing the surface to the surface of the axial bearing to provide lubrication between the axial bearing and the rotating shaft and the axial bearing when the rotating shaft is actuated The step of lubrication with the fixed outer wall.

Compared with the prior art, the oil-free lubricating centrifugal refrigerant compressor of the present invention can provide radial and axial load forces of the rotating shaft by using radial bearings and axial bearings, respectively, when the compression module is actuated, by the first The introduction member introduces the lubricating refrigerant fluid from the outside of the housing to provide proper lubrication between the radial bearing and the fixed outer wall, between the radial bearing and the rotating shaft, between the axial bearing and the fixed outer wall, and between the axial bearing and the rotating shaft. The effect is that the rotating shaft can be smoothly rotated at a high speed, and the utility is excellent. The oil-free lubricating centrifugal refrigerant compressor of the invention does not need to use extra electric energy, does not need to be matched with other control systems, and does not need to use lubricating oil as a lubricant for the rotating shaft, so that the user's use burden can be further reduced and the use can be avoided. Environmental pollution caused by lubricating oil and pollution of refrigerant.

The embodiments of the present invention are described below by way of specific examples, and those skilled in the art can readily appreciate other advantages and advantages of the present invention from the disclosure.

Please refer to FIG. 1, FIG. 2A, FIG. 2B, FIG. 3A, FIG. 3B, FIG. 4A and FIG. 4B together to clearly explain the structure of the oil-free lubricating centrifugal refrigerant compressor of the present invention. 1 is a structural view of an oil-free lubricating centrifugal refrigerant compressor of the present invention, and FIGS. 2A and 2B are an embodiment of a radial bearing of an oil-free lubricating centrifugal refrigerant compressor of the present invention. 3A and 3B are front and cross-sectional views of another embodiment of a radial bearing of an oil-free lubricating centrifugal refrigerant compressor of the present invention, and FIGS. 4A and 4B The drawings are a front view and a cross-sectional view of still another embodiment of the radial bearing of the oil-free lubricating centrifugal refrigerant compressor of the present invention.

As shown, the oil-free lubricating centrifugal refrigerant compressor 1 of the present invention comprises a housing 10, a refrigerant flow passage 11, a compression module 12, radial bearings 13a, 13b, an axial bearing 14, and a first introduction member 15a. 15b, 15c, collecting tanks 16a, 16b, 16c, 16d, 16e, first discharge members 17a, 17b, 17c, 17d, second introduction member 18, and second discharge member 19.

The refrigerant flow path 11 is connected to the casing 10 and includes a first flow path 110 for supplying low-pressure refrigerant and a second flow path 111 for discharging high-pressure refrigerant.

The compression module 12 is disposed in the casing 10 and has a rotating shaft 120 and a compression member 121 and a driving member 122 for connecting the rotating shaft 120. The outer side of the rotating shaft 120 has a fixed outer wall covering the rotating shaft 120 (not shown). In detail, the driving member 122 can drive the rotating shaft 120 to rotate, thereby driving the compressing member 121 to compress the aforementioned low-pressure refrigerant into a high-pressure refrigerant.

In this embodiment, the compression member 121 is a two-stage impeller and is disposed on one end of the rotating shaft 120, and the driving member 122 can be a high-speed variable-frequency motor stator. The compression member 121 can also be a first-stage impeller or a plurality of stages of impellers, and are respectively disposed at two ends of the rotating shaft 120. Further, the refrigerant flow path 11 may be provided with an inlet guide vane 112 for guiding the low-pressure refrigerant flowing from the first flow path 110 to the compression member 121 to increase the compression efficiency. In addition, the compression module 12 further includes a labyrinth seal 123 disposed on one end of the rotating shaft 120 near the compression member 121, thereby reducing the probability of leakage of the high pressure refrigerant compressed by the compression member 121.

As shown in FIGS. 2A and 2B, the radial bearing 13a is, for example, a floating ring disposed between the fixed outer wall and the rotating shaft 120 and rotatably wrapped around the rotating shaft 120. Above (as shown in Figure 1 at both ends of the shaft 120). There is a gap between the radial bearing 13a and the rotating shaft 120 and the radial bearing 13a and the fixed outer wall, and the distance of the gap may be, for example, 0.03 mm to 0.1 mm, and the optimum value is 0.06 mm. Further, the radial bearing 13a has at least one through hole 130a facing the surface of the rotating shaft 120. However, the number and arrangement positions of the radial bearings are not limited to those disclosed in the embodiment. In other words, a single radial bearing 13a or a plurality of radial bearings may be disposed on the rotating shaft 120 according to different requirements. As in Fig. 1, two sets of radial bearings 13a and 13b).

In other embodiments, the radial bearings 13a, 13b may be of a stacked design. In other words, the radial bearings 13a, 13b may be further provided with one or more layers of radially inner diameter bearings to form a stacked structure. . Further, in the first drawing, a single through hole 130a and a through hole 130b are formed in the intermediate portions of the radial bearings 13a and 13b, as shown in Figs. 2A and 2B. In other embodiments, as shown in FIGS. 3A, 3B, 4A, and 4B, the radial bearing 13a may be in the circumferential direction of the rotating shaft 120 (direction A) or parallel to the axial direction of the rotating shaft 120 (B). The direction) is provided with a plurality of through holes at the same time, and the positions of the plurality of through holes may also correspond to each other. For example, the radial bearing 13a shown in Fig. 3A is formed with four through holes 130a1, 130a2, 130a3, and 130a4 at equal intervals in the circumferential direction of the rotary shaft 120, and at a level orthogonal to the axial direction of the radial bearing 13a. The shaft and the vertical shaft each have two through holes corresponding to each other, or the radial bearings 13a as shown in FIGS. 4A and 4B are simultaneously formed in the axial direction parallel to the rotating shaft 120 and the circumferential direction of the rotating shaft 120. a plurality of through holes corresponding to each other, wherein the through hole 130a1 of FIG. 4A corresponds to the through hole 130a3 and the through hole 130a2 corresponds to the through hole 130a4. In FIG. 4B, the radial bearing 13a is shown to be parallel to the axis of the rotating shaft 120. The direction (B direction) forms two sets of corresponding through holes 130a1, 130a2, 130a3, and 130a4 and through holes 130b1, 130b2, 130b3, and 130b4.

The axial bearing 14 is disposed between one end of the rotating shaft 120 and the fixed outer wall for providing an axial load to the rotating shaft 120. In this embodiment, the axial bearing 14 may be in the shape of a disk and fixed between one end of the rotating shaft 120 and the fixed outer wall in a direction perpendicular to the axial direction of the rotating shaft 120, and one end of the rotating shaft 120 is connected to the circle. On the central area of the disk-shaped axial bearing 14.

The first introduction members 15a, 15b, and 15c are disposed in the casing 10. As shown in Fig. 1, the first introduction member 15a may be a linear tubular body, and one end thereof faces the surface of the radial bearing 13a. The first introduction member 15b may be a T-shaped tubular body and simultaneously face the surface of the radial bearing 13b and one of the surfaces of the axial bearing 14. The first introduction member 15c may also be a linear tubular body with one end facing the other surface of the axial bearing 14. By the first introduction members 15a, 15b, and 15c, a lubricating refrigerant fluid (for example, a gaseous refrigerant or a liquid refrigerant) can be introduced to the surfaces of the radial bearings 13a and 13b and the axial bearing 14, respectively, while being located in the radial direction. The lubricating refrigerant fluid on the surfaces of the bearings 13a and 13b may also flow into the surface of the rotating shaft 120 through the through holes 130a and 130b, respectively.

In detail, the lubricating refrigerant fluid can be between the radial bearings 13a, 13b and the aforementioned fixed outer wall, between the radial bearings 13a, 13b and the rotating shaft 120, between the axial bearing 14 and the rotating shaft 120, and the axial bearing 14 When the compression module 12 is actuated, the film-like lubricating refrigerant fluid can supply the radial bearings 13a, 13b, the axial bearing 14, and the lubricating fluid flow between the fixed outer wall and the fixed outer wall. The proper lubrication of the fixed outer wall prevents damage to the rotating shaft 120 and the fixed outer wall. Preferably, the first introduction member 15a and the first introduction member 15b are respectively directed above the through hole 130a and the through hole 130b, so that the lubricating refrigerant fluid can flow more accurately into the surface of the rotary shaft 120. However, the shape, number, and arrangement of the first introduction members 15a, 15b, and 15c may be changed depending on the design of the user.

The collecting tank 16a and the collecting tank 16b are provided at both ends of the radial bearing 13a, respectively, for collecting the lubricating refrigerant fluid introduced into the surfaces of the radial bearing 13a and the rotating shaft 120 via the first introduction member 15a. The collecting grooves 16c and 16d are respectively provided at both ends of the radial bearing 13b for collecting the lubricating refrigerant fluid introduced into the radial bearing 13b and the surface of the rotating shaft 120 via the first introduction member 15b. The collecting groove 16e is provided on the periphery of the axial bearing 14 for collecting the lubricating refrigerant fluid introduced into the surface of the axial bearing 14 via the first introduction members 15b and 15c.

In the present embodiment, as shown in Fig. 1, the collecting groove 16a communicates with the first discharge member 17a, the collecting groove 16b can communicate with the first discharge member 17c, and the collecting groove 16c can communicate with the collecting groove 16e, and the collecting groove 16d It is simultaneously covered in the central area of the axial bearing 14. Therefore, the refrigerant flow system for lubrication in the collection tank 16a can be discharged by the first discharge member 17a connected to the collection tank 16a, and the refrigerant fluid for lubrication in the collection tank 16b is discharged through the first discharge member 17c, and the collection tank The lubricating refrigerant fluid in 16c flows into the collecting tank 16e via the first discharge member 17d, and forms a film-like lubricating refrigerant fluid on one surface of the axial bearing 14, and finally merges into the collecting tank 16e. The lubricating refrigerant fluid in the collecting tank 16e can be discharged again by the first discharge member 17b connected to the collecting tank 16e, and the refrigerant fluid for recovery lubrication in the collecting tanks 16a, 16b, and 16e is discharged to the evaporator. (not shown).

Furthermore, the driving member 122 of the compression module 12 can be connected with the second introducing member 18 and the second discharging member 19, so that the cooling fluid (for example, liquid refrigerant, etc.) can be used by the second introducing member 18, for example, a tubular body. It is introduced into the driving member 122, and the cooling fluid in the driving member 122 can be discharged again by, for example, the second discharge member 19 of the tubular body. In addition, the radial bearing 13a is provided with a groove 131a and a groove 132a at both ends of the surface of the fixed outer wall, and the grooves 131a, 132a are respectively covered by the collecting groove 16a and the collecting groove 16b, by the groove 131a And the groove 132b can improve the efficiency of collecting the lubricating refrigerant fluid in the collecting tank 16a and the collecting tank 16b. Similarly, the radial bearing 13b may be further provided with a groove 131b and a groove 132b at both ends of the surface of the fixed outer wall, and are respectively covered by the collecting groove 16c and the collecting groove 16d. Of course, the groove 131b and the groove The 132b may also store the lubricated refrigerant fluid first, and then collect it in the collection tank 16c and the collection tank 16d to avoid excessive refrigerant fluid leakage.

In actual implementation, the first introduction members 15a, 15b, 15c and the second introduction member 18 are connected to an outlet of a condenser (not shown) provided outside the casing 10, and the second flow passage 111 is a high-pressure gaseous refrigerant air passage. , connected to the inlet of the condenser. The first discharge members 17a, 17b and the second discharge member 19 can be connected to an evaporator (not shown) or an economizer (not shown) provided outside the casing 10, and can collect low-pressure refrigerant discharged to the evaporator or save energy. And the first inlet 15a, 15b, 15c is further connected with a pressurized storage device (not shown), wherein the pressurized storage device stores the lubricating refrigerant fluid in the first place by pressure, and is subjected to oil-free lubrication centrifugal type. After the refrigerant compressor 1 is started, the pressurized storage device opens its delivery port, and the lubricating refrigerant fluid is actively released into the first introduction members 15a, 15b, 15c by pressure release.

Therefore, when the oil-free lubricating centrifugal refrigerant compressor 1 of the present invention is started, the pressurized storage device can first actively introduce the stored liquid refrigerant into the first introduction members 15a, 15b, 15c by the applied pressure. An appropriate lubricating effect is provided between the rotating shaft 120 and the radial bearings 13a and 13b, and between the rotating shafts 120 and the axial bearing 14, so that the rotating shaft 120 is prevented from being worn due to the introduction of the lubricating refrigerant fluid. Then, the rotating shaft 120 starts to rotate at a high speed by the power provided by the driving member 122, and drives the compressing member 121 to move the low-pressure gaseous refrigerant from the first flow path 110 to form a high-pressure gaseous refrigerant from the second flow path 111. discharge. Thereafter, when the high-pressure gaseous refrigerant is discharged from the second flow path 111, it can be converted into a liquid refrigerant by the condenser, and the converted liquid refrigerant is guided back to the first introduction members 15a, 15b, and 15c to be relubricated. At the same time, the converted liquid refrigerant is also guided into the second introduction member 18 to serve as a cooling fluid for the driving member 122 to be cooled, so that the operating temperature of the driving member 122 is maintained in an appropriate range. Then, the first discharge members 17a, 17b, and the second discharge member 19 discharge the liquid refrigerant to the evaporator or the economizer to re-convert the liquid refrigerant into a gaseous low-pressure refrigerant by the evaporator or the economizer. Complete the circulation process of the refrigerant.

Specifically, the radial bearing 13a is exemplified, and since the liquid refrigerant can be formed into a film-like lubricating refrigerant fluid by the through hole 130a between the radial bearing 13a and the rotating shaft 120, when the rotating shaft 120 is used, When the high-speed rotation is performed, the lubricating refrigerant fluid between the radial bearing 13a and the rotating shaft 120 drives the radial bearing 13a to rotate at a speed slower than the rotational speed of the rotating shaft 120. Therefore, the radial bearing 13a can provide the radial direction of the rotating shaft 120. The load force. For example, when the rotational speed of the rotating shaft 120 is 10000 RPM, the rotational speed of the radial bearing 13a is about 3000 RPM. Secondly, since the radial bearing 13a has both the inner and outer film-like lubricating refrigerant fluids, the dynamic stability of the rotating shaft 120 can be improved and the probability of damage to the rotating shaft 120 and the radial bearing 13a can be reduced.

In addition, please refer to Fig. 5 to clearly illustrate the lubrication method of the oil-free lubricating centrifugal refrigerant compressor of the present invention.

In step S51, a radial bearing having at least a consistent perforation is disposed between the fixed outer wall and the rotating shaft so as to rotatably cover the rotating shaft, and the inner surface of the radial bearing and the surface of the rotating shaft are There is a gap between the outer surface of the radial bearing and the fixed outer wall, and the through hole communicates with the outer peripheral surface of the radial bearing to the surface of the rotating shaft, and then proceeds to step S52.

In step S52, the lubricating refrigerant fluid is passed through the fixed outer wall and introduced into the surface of the radial bearing, and the through hole of the radial bearing flows into the surface of the rotating shaft to provide the rotating shaft when the rotating shaft is actuated. Lubrication between the radial bearing and the fixed outer wall and between the radial bearing and the rotating shaft.

In this embodiment, when step S52 is performed, a plurality of collecting grooves may be disposed at both ends of the radial bearing to collect the lubricating fluid for lubrication of the radial bearing and the surface of the rotating shaft. Next, the lubricating refrigerant fluid in the collection tank can be discharged, for example, the lubricating refrigerant fluid in the collection tank can be discharged from the collection tank to the evaporator or the economizer.

In another embodiment, when step S51 is performed, an axial bearing is disposed between one end of the rotating shaft and the fixed outer wall; thereby, the lubricating refrigerant fluid described in step S52 can also be introduced together. To the surface of the axial bearing, to provide lubrication between the axial bearing and the rotating shaft and lubrication between the axial bearing and the fixed outer wall when the rotating shaft is actuated.

Furthermore, in the present embodiment, a plurality of collecting grooves may be provided on the periphery of the axial bearing to collect the lubricating refrigerant fluid on the surface of the axial bearing, and of course, the lubrication in the collecting tank may be used. The refrigerant fluid is discharged from the collection tank to the evaporator or economizer.

In addition, in the above two embodiments, before the step S52, a pressurized storage device for storing the lubricating refrigerant fluid and pressurizing the stored lubricating refrigerant fluid may be provided, whereby the lubricating refrigerant fluid may be borrowed. The pressure provided by the pressurized storage device actively flows to the surface of the radial bearing, the surface of the shaft, and/or the surface of the axial bearing.

In summary, the oil-free lubricating centrifugal refrigerant compressor of the present invention provides radial and axial load forces of the rotating shaft by using radial bearings and axial bearings, respectively, and the first introducing member can be used when the compression module is actuated. The lubricating refrigerant fluid is introduced from the outside of the casing to provide a proper lubrication effect for the radial bearing, the rotating shaft, and the axial bearing, whereby the rotating shaft can be stably rotated at a high speed, and the frictional power consumption between the rotating shaft and the outer wall is greatly reduced. It also reduces the waste of electrical energy, and its practicality is very good. At the same time, the oil-free lubricating centrifugal refrigerant compressor of the invention does not need to be equipped with an additional control system, and does not need to use lubricating oil as a lubricant for the rotating shaft, so that the manufacturing cost and the use cost of the compressor can be reduced, and the generation can be avoided. The problem of reduced thermal efficiency of the refrigerant and environmental pollution caused by the use of lubricating oil.

The above-described embodiments are merely illustrative of the principles of the invention and its effects, and are not intended to limit the invention. Modifications and variations of the above-described embodiments can be made by those skilled in the art without departing from the spirit and scope of the invention. Therefore, the scope of protection of the present invention should be as set forth in the scope of the claims described below.

1. . . Oil-free lubricating centrifugal refrigerant compressor

10. . . case

11. . . Refrigerant flow channel

110. . . First runner

111. . . Second flow path

112. . . Entrance guide vane

12. . . Compression module

120. . . Rotating shaft

121. . . Compressed part

122. . . Drive

123. . . Labyrinth ring

13a, 13b. . . Radial bearing

130a, 130a1, 130a2, 130a3, 130a4. . . Through hole

130b, 130b1, 130b2, 130b3, 130b4. . . Through hole

131a, 132a, 131b, 132b. . . Groove

14. . . Axial bearing

15a, 15b, 15c. . . First import

16a, 16b, 16c, 16d, 16e. . . Collection slot

17a, 17b, 17c, 17d. . . First discharge

18. . . Second import

19. . . Second discharge

S51~S52. . . step

1 is a structural view of an oil-free lubricating centrifugal refrigerant compressor of the present invention; and FIG. 2A is a front view showing an embodiment of a radial bearing of an oil-free lubricating centrifugal refrigerant compressor of the present invention; The figure is a cross-sectional view of the radial bearing of the oil-free lubricating centrifugal refrigerant compressor of the present invention corresponding to the embodiment of FIG. 2A; and FIG. 3A is the radial bearing of the oil-free lubricating centrifugal refrigerant compressor of the present invention. A front view of another embodiment; a third section is a cross-sectional view of the radial bearing of the oil-free lubricating centrifugal refrigerant compressor of the present invention corresponding to the embodiment of FIG. 3A; and FIG. 4A is an oil-free lubrication of the present invention. A front view of still another embodiment of a radial bearing of a centrifugal refrigerant compressor; and FIG. 4B is a cross-sectional view of the radial bearing of the oil-free lubricating centrifugal refrigerant compressor of the present invention corresponding to the embodiment of FIG. 4A; Fig. 5 is a flow chart showing the lubrication method of the oil-free lubricating centrifugal refrigerant compressor of the present invention.

1. . . Oil-free lubricating centrifugal refrigerant compressor

10. . . case

11. . . Refrigerant flow channel

110. . . First runner

111. . . Second flow path

112. . . Entrance guide vane

12. . . Compression module

120. . . Rotating shaft

121. . . Compressed part

122. . . Drive

123. . . Labyrinth ring

13a, 13b. . . Radial bearing

130a, 130b. . . Through hole

131a, 132a, 131b, 132b. . . Groove

14. . . Axial bearing

15a, 15b, 15c. . . First import

16a, 16b, 16c, 16d, 16e. . . Collection slot

17a, 17b, 17c, 17d. . . First discharge

18. . . Second import

19. . . Second discharge

Claims (20)

An oil-free lubricating centrifugal refrigerant compressor for compressing a low-pressure refrigerant into a high-pressure refrigerant, comprising: a casing; a refrigerant flow passage connecting the casing, including a first flow passage for the low-pressure refrigerant to flow in and a second flow path for discharging the high-pressure refrigerant; the compression module is disposed in the housing, and has a rotating shaft and a compression member and a driving member connected to the rotating shaft, and is configured to drive the rotating shaft to rotate through the driving member The compression member compresses the low-pressure refrigerant into the high-pressure refrigerant, wherein the outer side of the rotating shaft has a fixed outer wall covering the rotating shaft; the radial bearing is disposed between the fixed outer wall and the rotating shaft, and is rotatably sleeved In the rotating shaft, wherein a surface of the radial bearing and a surface of the rotating shaft and a surface between the outer surface of the radial bearing and the fixed outer wall have a gap, and the radial bearing has at least one connected to the outer peripheral surface thereof a through hole on a surface of the rotating shaft; a first introducing member is disposed in the casing and communicates with the surface of the radial bearing through the fixed outer wall for lubricating the lubricating refrigerant Introduced to the surface of the radial bearing, and the lubricating refrigerant fluid also flows into the surface of the rotating shaft through the through hole of the radial bearing to provide the radial bearing and the fixed outer wall when the compression module is actuated And the lubrication between the radial bearing and the rotating shaft; a plurality of collecting grooves are respectively disposed at two ends of the radial bearing, a lubricating refrigerant fluid for introducing the radial bearing and the surface of the rotating shaft through the first introducing member; and a first discharging member connected to the collecting tank for the lubricating refrigerant in the collecting tank Fluid is discharged from the collection tank. The oil-free lubricating centrifugal refrigerant compressor according to claim 1, further comprising an axial bearing disposed at one end of the rotating shaft of the compression module and between the fixed outer wall, wherein the first introducing member faces the shaft a surface of the bearing for introducing a lubricating refrigerant fluid to the surface of the axial bearing to provide lubrication between the axial bearing and the rotating shaft and between the axial bearing and the fixed outer wall when the compression module is actuated Lubricating; and the collecting groove is further disposed on a periphery of the axial bearing for collecting the lubricating refrigerant fluid introduced into the surface of the axial bearing through the first introducing member. The oil-free lubricating centrifugal refrigerant compressor of claim 1, wherein one end of the first introduction member is connected to a condenser disposed outside the housing, and one end of the first discharge member is An evaporator or an economizer disposed outside the housing is connected. The oil-free lubricating centrifugal refrigerant compressor of claim 1, comprising a second introduction member and a second discharge member connected to the driving member of the compression module, wherein the second introduction member is used for cooling The fluid is introduced into the driving member, and the second discharging member is configured to discharge the cooling fluid introduced into the driving member from the driving member. An oil-free lubricating centrifugal refrigerant compressor according to claim 4, wherein one end of the second introduction member is connected to a condenser disposed outside the casing, and one end of the second discharge member is Set to The evaporator or economizer outside the housing is connected. An oil-free lubricating centrifugal refrigerant compressor according to claim 1, further comprising a pressurized storage device connected to the first inlet, storing the lubricating refrigerant fluid and applying pressure to the lubricating refrigerant fluid, The lubricating refrigerant fluid is actively flowed to the first introduction member through the pressure when the compression module starts to operate. The oil-free lubricating centrifugal refrigerant compressor of claim 1, wherein the compression module comprises a labyrinth seal sleeve disposed on the rotating shaft and adjacent to the compression member, to prevent compression of the compression member. The high pressure refrigerant leaks out. The oil-free lubricating centrifugal refrigerant compressor of claim 1, wherein the collecting groove at both ends of the radial bearing communicates with the gap, and the gap value is 0.03 mm to 0.1 mm. The oil-free lubricating centrifugal refrigerant compressor according to claim 1, wherein two through holes corresponding to each other are formed on the horizontal axis and the vertical axis orthogonal to the axial direction of the radial bearing. An oil-free lubricating centrifugal refrigerant compressor according to claim 1, wherein the radial bearing forms two corresponding through holes in an axial direction parallel to the rotating shaft. The invention relates to a lubrication method for an oil-free lubricating centrifugal refrigerant compressor, which is used for lubricating a rotating shaft of a centrifugal refrigerant compressor and a fixed outer wall covering the rotating shaft, comprising the following steps: (1) a radial bearing having at least consistent perforation Provided on the fixed outer wall and the rotating shaft in a manner of rotatably covering the rotating shaft a gap between the inner surface of the radial bearing and the surface of the rotating shaft and between the outer surface of the radial bearing and the fixed outer wall, and the through hole is communicated to the rotating shaft by the outer peripheral surface of the radial bearing And (2) passing the lubricating refrigerant fluid through the fixed outer wall and introducing the surface to the surface of the radial bearing, and flowing through the through hole of the radial bearing into the surface of the rotating shaft to provide the rotating shaft when the rotating shaft is actuated Lubrication between the radial bearing and the fixed outer wall and between the radial bearing and the rotating shaft. The lubricating method of the oil-free lubricating centrifugal refrigerant compressor according to claim 11 further includes the step (3): setting a plurality of collecting grooves at both ends of the radial bearing to collect the radial bearing and the rotating shaft The refrigerant fluid for lubrication of the surface. The lubricating method for an oil-free lubricating centrifugal refrigerant compressor according to claim 12, further comprising the step (4) of discharging the lubricating refrigerant fluid in the collecting tank. The lubricating method of the oil-free lubricating centrifugal refrigerant compressor according to claim 13, wherein the step of discharging the lubricating refrigerant fluid in the collecting tank is to discharge the lubricating refrigerant fluid in the collecting tank to the evaporator And / or energy saver. The lubricating method of the oil-free lubricating centrifugal refrigerant compressor of claim 11, wherein the step (2) comprises: (2-1) providing a pressurized storage device for storing the lubricating refrigerant fluid and The stored refrigerant fluid is pressurized; and (2-2) the lubricating refrigerant fluid is supplied to the surface of the radial bearing and the surface of the rotating shaft by the pressure provided by the pressurized storage device. The lubricating method of the oil-free lubricating centrifugal refrigerant compressor of claim 11, wherein the step (1) includes the step of providing an axial bearing between one end of the rotating shaft and the fixed outer wall; The step (2) further includes the step of passing the lubricating refrigerant fluid through the fixed outer wall and introducing it to the surface of the axial bearing. The lubricating method of the oil-free lubricating centrifugal refrigerant compressor of claim 16 further includes the step (3) of providing a plurality of collecting grooves on the circumference of the axial bearing to collect the surface of the axial bearing Lubricating refrigerant fluid. The lubricating method of the oil-free lubricating centrifugal refrigerant compressor according to claim 17, further comprising the step (4) of discharging the lubricating refrigerant fluid in the collecting tank. The lubricating method of the oil-free lubricating centrifugal refrigerant compressor of claim 16, wherein the step (2) comprises (2-1) providing a pressurized storage device for storing the lubricating refrigerant fluid and The stored refrigerant fluid is pressurized; and (2-2) the lubricating refrigerant fluid is supplied to the surface of the axial bearing by the pressure provided by the pressurized storage device. The method for lubricating an oil-free lubricating centrifugal refrigerant compressor according to claim 18, wherein the step of discharging the lubricating refrigerant fluid in the collecting tank is to discharge the lubricating refrigerant fluid in the collecting tank to an evaporator And / or energy saver.