A four-stage compression centrifugal compressor

Abstract

The present invention relates to the field of compressor structure, specifically a four-stage compression centrifugal compressor, comprising a compressor box outer structure group and an interface mounting seat, wherein an in-box oil nozzle structure is arranged at the bottom of the interface mounting seat, a flow direction dynamic spacing guide group and a flow beam plane regulation group are arranged on the inner side of the compressor box outer structure group, and an in-box oil guide rib group is arranged between the flow direction dynamic spacing guide group and the flow beam plane regulation group; the flow velocity of the blocked splashing oil when input to the inner side of the lower box structure is reduced by blocking the metal oil baffle plate and the wall extended guide part, so that the flow beam guide head sprays the oil straightly and directly reaches the gear surface through the radial passing surface formed by the oil path transition cavity, while the splashing oil sprayed laterally flows to the gear surface slowly through the metal oil baffle plate and the wall extended guide part, so that the gear obtains sufficient oil while the oil can be diffused to the edge position of the transmission gear more quickly through the centrifugal action.

Description

Technical Field

[0001] The invention relates to the technical field of compressor structures, in particular to a four-stage compression centrifugal compressor. Background Art

[0002] Since the distribution, flow and lubrication effect of lubricating oil in the compressor gearbox depend on the guide surface of the box cavity structure, and the speed of the oil directly affects the lubrication effect, if the oil speed is too fast, the lubricating oil may stay on the gear surface for too short a time and fail to fully exert its lubricating effect; while if the oil speed is too slow, the lubricating oil may accumulate too much on the gear surface, resulting in an excessively thick oil film, which affects the heat dissipation effect. Therefore, in order to better maintain the lubrication effect of the compressor gearbox, it is necessary to maintain a reasonable distribution of the oil guide ribs in the inner cavity of the compressor gearbox so that the flow can be maintained stable. When the speed of the compressor gearbox used in the traditional four-stage compression compressor increases, the lubricating oil will splash and flow when it passes through the upper shell to the gear surface. At this time, the oil speed increases, and the radial distance of the non-restricted splashing oil increases with the increase in speed. In addition, the distribution range of the lubricating oil inside the compressor gearbox is wider, so that more lubricating oil directly converges in the oil tank at the bottom of the compressor gearbox, and it is difficult to diffuse to the edge of the transmission gear due to the centrifugal effect of the gear, which is easy to reduce the lubrication effect of the edge of the transmission gear. Therefore, it is not conducive to improving the stability of the performance of the compressor gearbox. Summary of the invention

[0003] In view of the problems in the prior art, the present invention provides a four-stage compression centrifugal compressor.

[0004] The technical solution adopted by the present invention to solve its technical problems is: a four-stage compression centrifugal compressor, including a compressor box outer structure group and an interface mounting seat, the interface mounting seat is provided with an in-box oil nozzle structure at the bottom, the inner side of the compressor box outer structure group is provided with a flow direction dynamic spacing guide group and a flow beam plane regulation group, an in-box oil guide rib group is provided between the flow direction dynamic spacing guide group and the flow beam plane regulation group, the flow beam plane regulation group is embedded in the inner side of the in-box oil guide rib group, the in-box oil guide rib group is used to provide a converging flow surface for the splashing part when the in-box oil nozzle structure sprays lubricating oil, the flow direction dynamic spacing guide group is used to adjust the spacing when the in-box oil nozzle structure sprays lubricating oil flow beam, and after the debugging of the flow direction dynamic spacing guide group is completed, the flow beam plane regulation group is used to change the radial passing surface when the lubricating oil injection flow beam is input to the inner side of the lower box structure.

[0005] Preferably, the compressor box external structure group includes an upper box structure, a lower box structure and a compression structure cover, the upper box structure and the lower box structure are screwed and fixed, the compression structure cover is screwed and fixed to the lower box structure, and the flow direction dynamic spacing guide group, the in-box oil guide rib group and the flow plane control group are all located on the inner side of the upper box structure.

[0006] Preferably, the flow direction dynamic spacing guide group is composed of an extension actuator, a flexible connection bellows and a directional guide structure groove, the directional guide structure groove is fixedly connected to the inner side of the upper box structure, the extension actuator and the flexible connection bellows are both arranged on the inner side of the directional guide structure groove, one end of the flexible connection bellows is fixedly connected to the interface mounting seat, the other end of the flexible connection bellows is fixedly connected to the oil nozzle structure in the box, and the extension actuator is used to push the oil nozzle structure in the box to slide longitudinally along the inner side of the directional guide structure groove, thereby changing the injection spacing between the oil nozzle structure in the box and the lower box structure.

[0007] Preferably, the oil guiding rib group in the box includes an oil circuit connecting chamber, an oil circuit transition chamber and an oil circuit splashing surface guide chamber, and the oil circuit connecting chamber, the oil circuit transition chamber and the oil circuit splashing surface guide chamber are all opened on the inner side of the upper box body structure, the oil circuit connecting chamber is used to provide movement space when adjusting the injection spacing of the oil nozzle structure in the box, and to block the splashing part generated when the oil nozzle structure in the box outputs the lubricating oil, the oil circuit transition chamber is located between the oil circuit connecting chamber and the oil circuit splashing surface guide chamber, the oil circuit transition chamber is used to concentrate and guide the splashing lubricating oil blocked by the oil circuit connecting chamber to the lower box body structure, and the oil circuit splashing surface guide chamber is used to provide the receiving space during the contraction movement in the flow plane control group.

[0008] Preferably, the flow jet plane control group includes a metal oil baffle plate, an axial adjustment portion of a baffle surface and a guide portion extending through the wall, the axial adjustment portion of the baffle surface is embedded and installed on the inner side of the guide cavity of the oil circuit splashing surface, the transmission end of the axial adjustment portion of the baffle surface is fixedly connected to the metal oil baffle plate, and the axial adjustment portion of the baffle surface drives and adjusts the guide spacing and transmission inclination angle of the metal oil baffle plate, so as to switch the radial passing surface and passing flow rate of the concentrated guide oil in the oil circuit transition cavity.

[0009] Preferably, a flow guide head is installed at the bottom of the oil nozzle structure in the box, the oil nozzle structure in the box is connected to the interface mounting seat through the flexible connecting bellows, the interface mounting seat is connected to the external oil delivery structure, and the flow guide head is used to output oil to the lower box structure.

[0010] Compared with the prior art, the beneficial effects of the present invention are as follows: in order to avoid a wide distribution range of lubricating oil during output, the lubricating oil is directly converged in the oil groove at the bottom of the compressor gear box, and the flexible connecting leather cavity is pushed to slide longitudinally along the inner side of the directional guide structure groove by the set extension actuator, thereby changing the injection spacing between the oil nozzle structure in the box and the lower box structure. After the injection spacing is changed, when the flow beam guide head outputs oil splashing, it is blocked by the oil circuit connecting cavity, and after the concentrated diversion of the oil circuit transition cavity, it flows slowly to the guide cavity position of the oil circuit splashing surface, and the axial debugging part of the blocking surface drives and adjusts the diversion spacing of the metal oil baffle plate and the transmission inclination The angle is set so that the radial passing surface of the concentrated guide oil in the oil circuit transition chamber is reduced, and the passing flow velocity of the blocked splashing oil when it is input to the inner side of the lower box structure is reduced through the interception of the metal oil baffle plate and the wall extension guide part, so that the flow beam guide head sprays the oil in a straight line directly through the radial passing surface formed by the oil circuit transition chamber to reach the gear surface, while the splashing oil sprayed laterally is intercepted by the metal oil baffle plate and the wall extension guide part and flows slowly to the gear surface. The gear surface is fully covered with lubrication, so that the gear obtains sufficient oil, and the oil can be diffused to the edge of the transmission gear more quickly through the centrifugal effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0012] Figure 1 It is a cross-sectional view of the present invention.

[0013] Figure 2 It is a schematic diagram of the three-dimensional structure of the present invention.

[0014] Figure 3 for Figure 1 Enlarged view of part A in the middle.

[0015] In the figure: 1. Compressor box outer structure group; 11. Upper box structure; 12. Lower box structure; 13. Compression structure cover; 2. Flow direction dynamic spacing guide group; 21. Extension actuator; 22. Flexible connection leather cavity; 23. Directional guide structure groove; 3. Oil guide rib group in the box; 31. Oil circuit connecting cavity; 32. Oil circuit transition cavity; 33. Oil circuit splashing surface guide cavity; 4. Flow jet plane adjustment group; 41. Metal oil baffle; 42. Flow blocking surface axial adjustment part; 43. Through wall extension guide part; 5. Interface mounting seat; 6. Oil nozzle structure in the box; 61. Flow jet guide head. DETAILED DESCRIPTION

[0016] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further explained below in conjunction with specific implementation methods.

[0017] like Figure 1-Figure 3As shown, a four-stage compression centrifugal compressor described in the present invention includes a compressor box outer structure group 1 and an interface mounting seat 5, an inner box oil nozzle structure 6 is arranged at the bottom of the interface mounting seat 5, a flow direction dynamic spacing guide group 2 and a flow beam plane control group 4 are arranged on the inner side of the compressor box outer structure group 1, an inner box oil guide rib group 3 is arranged between the flow direction dynamic spacing guide group 2 and the flow beam plane control group 4, the flow beam plane control group 4 is embedded in the inner side of the inner box oil guide rib group 3, the inner box oil guide rib group 3 is used to provide a converging flow surface for the splashing part when the inner box oil nozzle structure 6 sprays lubricating oil, the flow direction dynamic spacing guide group 2 is used to debug the spacing of the inner box oil nozzle structure 6 when spraying the lubricating oil flow beam, and after the debugging of the flow direction dynamic spacing guide group 2 is completed, the flow beam plane control group 4 is used to change the radial passing surface when the lubricating oil spray flow beam is input into the inner side of the lower box structure 12.

[0018] In this embodiment, in order to avoid a wide distribution range of the lubricating oil during output, the lubricating oil is directly converged in the oil tank at the bottom of the compressor gear box, which makes it difficult for the lubricating oil to diffuse to the edge of the transmission gear due to the centrifugal effect of the gear, which is not conducive to the lubrication of the edge of the transmission gear. The present invention solves this technical problem by proposing a compressor box external structure group 1, a flow direction dynamic spacing guide group 2, an oil guide rib group 3 in the box, and a flow plane control group 4.

[0019] In an optional implementation of the present embodiment, the compressor box external structure group 1 includes an upper box structure 11, a lower box structure 12 and a compression structure cover 13. The upper box structure 11 and the lower box structure 12 are screwed and fixed, and the compression structure cover 13 is screwed and fixed to the lower box structure 12. The flow direction dynamic spacing guide group 2, the oil guide rib group 3 in the box and the flow plane control group 4 are all located on the inner side of the upper box structure 11.

[0020] In this embodiment, the upper box structure 11, the lower box structure 12 and the compression structure cover 13 constitute a compressor gear box structure, wherein the upper box structure 11 is connected to the external lubricating oil injection mechanism by setting an interface mounting seat 5, and the lower box structure 12 is used to load the transmission gear. Since the cavity of the gear loading part of the lower box structure 12 has not been improved, the technical principle of this part will not be repeated here.

[0021] In an optional implementation of the present embodiment, the flow direction dynamic spacing guide group 2 is composed of an extension actuator 21, a flexible connection leather cavity 22 and a directional guide structure groove 23. The directional guide structure groove 23 is fixedly connected to the inner side of the upper box structure 11. The extension actuator 21 and the flexible connection leather cavity 22 are both arranged on the inner side of the directional guide structure groove 23. One end of the flexible connection leather cavity 22 is fixedly connected to the interface mounting seat 5, and the other end of the flexible connection leather cavity 22 is fixedly connected to the nozzle structure 6 in the box. The extension actuator 21 is used to push the nozzle structure 6 in the box to slide longitudinally along the inner side of the directional guide structure groove 23, thereby changing the injection spacing between the nozzle structure 6 in the box and the lower box structure 12.

[0022] In this embodiment, the flexible connection bellows 22 can be pushed to slide longitudinally along the inner side of the directional guide structure groove 23 by extending the actuator 21, thereby changing the injection distance between the nozzle structure 6 in the box and the flow guide head 61 and the lower box structure 12, wherein one end of the nozzle structure 6 in the box is fixedly connected to the flexible connection bellows 22. When the output end of the extending actuator 21 pushes the nozzle structure 6 in the box to slide longitudinally, the flexible connection bellows 22 is synchronously expanded along the output end of the extending actuator 21 and the nozzle structure 6 in the box as the nozzle structure 6 in the box moves to the debugging distance, so that after the nozzle structure 6 in the box moves to the debugging distance, the flexible connection bellows 22 can still serve as a sealing conduit when the oil passes through, and does not affect the lubricating oil from being ejected through the flow guide head 61. After the injection spacing of the oil nozzle structure 6 in the box is changed, the spacing of the injection stream when it reaches the gear surface is reduced, so that the oil sprayed from the stream guide head 61 can be directly blocked by the oil guide rib group 3 in the box and flow slowly to the gear surface after splashing, avoiding the splashing lubricating oil from directly diffusing and converging in the oil tank at the bottom of the compressor gear box, ensuring that the sprayed lubricating oil can be directly diffused to the edge of the transmission gear under the centrifugal effect of the gear.

[0023] In an optional implementation of the present embodiment, the oil guide rib group 3 in the box includes an oil circuit connecting chamber 31, an oil circuit transition chamber 32 and an oil circuit splashing surface guide chamber 33. The oil circuit connecting chamber 31, the oil circuit transition chamber 32 and the oil circuit splashing surface guide chamber 33 are all opened on the inner side of the upper box structure 11. The oil circuit connecting chamber 31 is used to provide movement space for adjusting the injection spacing of the oil nozzle structure 6 in the box, and to block the splashing part generated when the oil nozzle structure 6 in the box outputs the lubricating oil. The oil circuit transition chamber 32 is located between the oil circuit connecting chamber 31 and the oil circuit splashing surface guide chamber 33. The oil circuit transition chamber 32 is used to concentrate and guide the splashing lubricating oil blocked by the oil circuit connecting chamber 31 to the lower box structure 12. The oil circuit splashing surface guide chamber 33 is used to provide a receiving space during the contraction movement in the flow plane control group 4.

[0024] In the present embodiment, when the flow guide head 61 outputs oil splashes, the oil path connecting chamber 31 blocks the splashed oil, so that the splashed oil flows slowly to the oil path splashing surface guide chamber 33 after the concentrated diversion of the oil path transition chamber 32. A groove is provided on the inner side of the oil path splashing surface guide chamber 33. The axial adjustment portion 42 of the blocking surface is installed on the inner side of the groove of the oil path splashing surface guide chamber 33 to realize the regulation of the lateral interception spacing and the diversion inclination angle of the metal oil baffle plate 41, so that the radial passing surface of the concentrated diversion oil of the oil path transition chamber 32 can be reduced. When the oil speed increases, the radial distance when the oil is sent to the lower box structure 12 can be reduced, so as to avoid a wide distribution range of the lubricating oil when it is output, causing the lubricating oil to directly converge in the oil tank at the bottom of the compressor gearbox.

[0025] In an optional implementation of the present embodiment, the flow plane control group 4 includes a metal oil baffle plate 41, an axial adjustment portion 42 of the baffle surface and a guide portion 43 extending through the wall. The axial adjustment portion 42 of the baffle surface is embedded and installed on the inner side of the oil circuit splashing surface guide cavity 33. The transmission end of the axial adjustment portion 42 of the baffle surface is fixedly connected to the metal oil baffle plate 41. The axial adjustment portion 42 of the baffle surface drives and adjusts the guide spacing and transmission inclination angle of the metal oil baffle plate 41, which is used to switch the radial passing surface and passing flow rate of the concentrated guide oil in the oil circuit transition cavity 32.

[0026] In this embodiment, please refer to the attached drawings of the specification. Figure 3 After the two groups of metal oil baffles 41 and the spacing and angles of the wall extension guide parts 43 are respectively adjusted by the two groups of flow-blocking surface axial adjustment parts 42, the radial passing surface of the concentrated guide oil in the oil circuit transition chamber 32 is reduced, and the guide oil passing stroke is increased after the wall extension guide part 43 is in an inclined state, so that the oil passing speed is slowed down. At this time, the blocked splashing oil is blocked by the metal oil baffle 41 and the wall extension guide part 43. The flow velocity of the blocked splashing oil when it is input to the inner side of the lower box structure 12 is reduced, so that the flow beam guide head 61 sprays the oil in a straight line directly through the radial passing surface formed by the oil circuit transition chamber 32 to reach the gear surface, while the splashing oil sprayed laterally is blocked by the metal oil baffle 41 and the wall extension guide part 43 and flows slowly to the gear surface. The gear surface is fully covered with lubrication, so that the gear obtains sufficient oil, and the oil can be diffused to the edge position of the transmission gear more quickly through the centrifugal action.

[0027] In the present embodiment, the axial adjustment part 42 of the baffle surface is composed of a transverse propulsion mechanism and an angle control mechanism, wherein the transverse propulsion mechanism adopts a micro-electrically controlled push rod, and the angle control mechanism adopts a micro-motor. The angle control mechanism is fixed to the metal oil baffle plate 41 through a rotating shaft, and the outer shell of the transverse propulsion mechanism is fixed to the inner side of the oil path splashing surface guide cavity 33, while the output end of the transverse propulsion mechanism is fixed to the outer shell of the micro-motor. The transverse propulsion mechanism pushes the angle control mechanism to move laterally, so that the metal oil baffle plate 41 connected to the angle control mechanism moves laterally and then changes the blocking distance of the metal oil baffle plate 41. After the blocking distance is reached, the steering inclination angle of the metal oil baffle plate 41 is adjusted by the angle control mechanism, so that the wall extension guide part 43 increases the passing stroke of the guide oil after the inclination angle of the metal oil baffle plate 41 is changed, so that the passing speed of the oil is slowed down, and then the splashing part of the oil sprayed from the convection beam guide head 61 is concentrated and collected, and at the same time, the part of the oil flows slowly to the gear surface inside the lower box structure 12, and then is fully diffused to the edge position of the transmission gear under the centrifugal effect of the gear.

[0028] In an optional implementation of this embodiment, a flow guide head 61 is installed at the bottom of the oil nozzle structure 6 in the box, and the oil nozzle structure 6 in the box is connected to the interface mounting seat 5 through a flexible connecting bellows 22, and the interface mounting seat 5 is connected to the external oil delivery structure. The flow guide head 61 is used to output the oil to the lower box structure 12.

[0029] In this embodiment, the interface mounting seat 5 is used to provide an assembly surface between the flexible connection bellows 22 and the oil nozzle structure 6 in the box. After the interface mounting seat 5 is connected to the output end of the external oil delivery structure, conduction is achieved between the flexible connection bellows 22 and the oil nozzle structure 6 in the box, so that the oil nozzle structure 6 in the box can receive the lubricating oil output by the external oil delivery structure and form a jet flow through the flow guide head 61 to spray to the gear surface on the inner side of the lower box structure 12.

[0030] The working principle of the present invention is as follows: when the oil speed required inside the lower box structure 12 increases, the flexible connecting skin cavity 22 is pushed to slide longitudinally along the inner side of the directional guide structure groove 23 by the extended actuator 21, so as to change the injection spacing between the oil nozzle structure 6 in the box and the lower box structure 12, so as to reduce the injection spacing. At this time, when the flow beam guide head 61 outputs oil splashing, it is blocked by the oil path connecting cavity 31, and flows slowly to the oil path splashing surface guide cavity 33 position after the concentrated flow diversion of the oil path transition cavity 32. At the same time, the axial adjustment part 42 of the flow blocking surface drives the metal oil baffle plate 41 to increase the flow diversion spacing and the transmission inclination angle, so as to reduce the injection spacing. The radial passage surface of the middle guide oil is reduced, and the metal oil baffle plate 41 and the wall extension guide portion 43 are used to block the blocked splashing oil, which is then inputted to the inner side of the lower box structure 12 at a lower flow rate, so that the flow guide head 61 sprays oil in a straight line and directly passes through the radial passage surface formed by the oil path transition chamber 32 to reach the gear surface, while the splashing oil sprayed laterally is blocked by the metal oil baffle plate 41 and the wall extension guide portion 43 and flows slowly to the gear surface, so that the gear can fully obtain all the oil sprayed by the flow guide head 61, and at the same time, the oil can be diffused to the edge of the transmission gear more quickly through the centrifugal action.

[0031] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention. The scope of the present invention is defined by the attached claims and their equivalents.

Claims

1. A four-stage centrifugal compressor, comprising a compressor housing outer structure group (1) and an interface mounting seat (5), characterized in that: An in-box oil nozzle structure (6) is arranged at the bottom of the interface mounting seat (5); a flow direction dynamic spacing guide group (2) and a flow beam plane control group (4) are arranged on the inner side of the compressor box outer structure group (1); an in-box oil guide rib group (3) is arranged between the flow direction dynamic spacing guide group (2) and the flow beam plane control group (4); the flow beam plane control group (4) is embedded inside the in-box oil guide rib group (3); the in-box oil guide rib group (3) is used to provide a convergent flow surface for the splashing part when the in-box oil nozzle structure (6) sprays lubricating oil; the flow direction dynamic spacing guide group (2) is used to adjust the spacing of the in-box oil nozzle structure (6) when spraying lubricating oil flow beams; after the flow direction dynamic spacing guide group (2) is adjusted, the flow beam plane control group (4) is used to change the radial passing surface when the lubricating oil spray flow beam is input; The compressor outer box structure group (1) comprises an upper box structure (11), a lower box structure (12) and a compression structure cover (13); the upper box structure (11) and the lower box structure (12) are screwed and fixed; the compression structure cover (13) and the lower box structure (12) are screwed and fixed; the flow direction dynamic spacing guide group (2), the box internal oil guide rib group (3) and the flow jet plane control group (4) are all located on the inner side of the upper box structure (11); The flow direction dynamic spacing guide group (2) is composed of an extension actuator (21), a flexible connection bellows (22) and a directional guide structure groove (23), wherein the directional guide structure groove (23) is fixedly connected to the inner side of the upper box structure (11), and the extension actuator (21) and the flexible connection bellows (22) are both arranged on the inner side of the directional guide structure groove (23), one end of the flexible connection bellows (22) is fixedly connected to the interface mounting seat (5), and the other end of the flexible connection bellows (22) is fixedly connected to the oil nozzle structure (6) in the box, and the extension actuator (21) is used to push the oil nozzle structure (6) in the box to slide longitudinally along the inner side of the directional guide structure groove (23), thereby changing the injection spacing between the oil nozzle structure (6) in the box and the lower box structure (12); The oil guide rib group (3) in the box comprises an oil circuit connecting chamber (31), an oil circuit transition chamber (32) and an oil circuit splashing surface guiding chamber (33); the oil circuit connecting chamber (31), the oil circuit transition chamber (32) and the oil circuit splashing surface guiding chamber (33) are all opened on the inner side of the upper box structure (11).

2. A four-stage compression centrifugal compressor according to claim 1, characterized in that: The oil passage communication cavity (31) is used to provide a movement space for adjusting the spray spacing of the oil nozzle structure (6) in the box, and to block splashing parts generated when the oil nozzle structure (6) in the box outputs lubricating oil.

3. A four-stage compression centrifugal compressor according to claim 1, characterized in that: The oil circuit transition chamber (32) is located between the oil circuit connecting chamber (31) and the oil circuit splashing surface guide chamber (33), the oil circuit transition chamber (32) is used to guide the splashing lubricating oil blocked by the oil circuit connecting chamber (31) to the lower box structure (12), and the oil circuit splashing surface guide chamber (33) is used to provide a collection space in the flow plane control group (4) during the contraction movement.

4. A four-stage compression centrifugal compressor according to claim 3, characterized in that: The jet plane control group (4) comprises a metal oil baffle plate (41), a flow blocking surface axial adjustment portion (42) and a guide portion (43) extending through a wall, wherein the flow blocking surface axial adjustment portion (42) is embedded and installed inside the oil path splashing surface guide cavity (33).

5. A four-stage compression centrifugal compressor according to claim 4, characterized in that: The transmission end of the axial adjustment portion (42) of the flow-blocking surface is fixedly connected to the metal oil baffle plate (41), and the axial adjustment portion (42) of the flow-blocking surface drives and adjusts the guide spacing and transmission inclination angle of the metal oil baffle plate (41), so as to switch the radial passing surface and passing flow rate of the concentrated guide oil in the oil circuit transition chamber (32).

6. A four-stage compression centrifugal compressor according to claim 1, characterized in that: A flow guide head (61) is installed at the bottom of the in-box nozzle structure (6), and the in-box nozzle structure (6) is connected to the interface mounting seat (5) via the flexible connecting bellows (22).

7. A four-stage compression centrifugal compressor according to claim 6, characterized in that: The interface mounting seat (5) is connected to an external oil delivery structure, and the flow guide head (61) is used to output oil to the lower box structure (12).

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