Guide vane transmission sealing structure of centrifugal compressor

Abstract

The utility model discloses a guide vane transmission sealing structure of a centrifugal compressor, which belongs to the technical field of centrifugal compression equipment and comprises a shell. The air inlet cylinder extends into the shell to form an air inlet channel; a plurality of guide vanes rotationally connected with the air inlet cylinder are arranged in the air inlet channel; the sealing bracket is in sealing connection with the shell and is provided with a sealing cavity; the transmission shaft sequentially penetrates through the sealing cavity and the shell. An annular protrusion is arranged on the part, located in the sealing cavity, of the transmission shaft, a concave cavity matched with the annular protrusion is formed in the sealing cavity, and a first bearing is arranged between the transmission shaft and the wall of the sealing cavity. The transmission shaft is in transmission connection with the guide vane through the guide vane adjusting assembly. The transmission shaft sequentially penetrates through the sealing cavity and the shell, and the swing angle of the guide vane is adjusted through the guide vane adjusting assembly; when the sealing bracket is hermetically connected with the outer wall of the shell, the annular bulge is matched with the wall of the sealing cavity to seal a high-pressure gas medium, so that leakage is avoided; the connecting structure among the sealing support, the shell and the transmission shaft is simple and stable.

Description

Technical Field

[0001] The utility model relates to the technical field of centrifugal compression equipment, in particular to a guide vane transmission sealing structure of a centrifugal compressor. Background Art

[0002] A centrifugal compressor is a rotary machine; under the action of a high-speed rotating impeller, the gas medium can obtain velocity energy and pressure energy, and through the action of the diffuser, the velocity energy is further converted into pressure energy, thereby increasing the pressure of the gas medium.

[0003] Guide vanes are important functional components of centrifugal compressors. By adjusting the swing angle of the guide vanes, they can adjust the inlet flow, pre-rotate the gas medium entering the impeller, improve aerodynamic efficiency, etc., ensure that the airflow flows evenly into the impeller, reduce turbulence and reduce the vibration and noise of the unit.

[0004] At present, the mechanism used to adjust the angle of the guide vane is usually a connecting rod type or a fork type, which has a relatively complex structure and needs to be arranged as a separate part in the front part of the impeller inlet chamber. Not only does it require a more complex sealing structure to prevent the leakage of the pressurized gas medium in the impeller inlet chamber, but the installation and disassembly are cumbersome and not easy to inspect and maintain.

[0005] Therefore, developing and designing a centrifugal compressor guide vane transmission sealing structure that can effectively seal high-pressure gas media, is easy to install and disassemble, and has high stability is a problem that needs to be urgently solved at this stage. Utility Model Content

[0006] In order to solve the problems existing in the prior art, the utility model provides a centrifugal compressor guide vane transmission sealing structure, in which the transmission shaft passes through the sealing cavity on the sealing bracket and the shell in sequence, and the swing angle of the guide vane can be adjusted through the guide vane adjustment assembly; while the sealing bracket is sealed and connected to the outer wall of the shell, the outer peripheral surface of the annular protrusion of the transmission shaft cooperates with the sealing cavity wall to effectively seal the high-pressure gas medium to avoid leakage; the connection structure between the sealing bracket and the shell and between the sealing bracket and the transmission shaft is simple and stable; at the same time, the sealing bracket and the transmission shaft can be used as a whole to facilitate installation and disassembly.

[0007] In order to achieve the above purpose, the technical solution adopted by the utility model is as follows:

[0008] The utility model provides a centrifugal compressor guide vane transmission sealing structure, comprising:

[0009] case;

[0010] An air intake cylinder, the air intake cylinder is fixedly connected to the housing, the air intake cylinder extends into the housing; the air intake cylinder forms an air intake passage; a plurality of guide vanes are arranged in the air intake passage, the plurality of guide vanes are distributed along the circumferential direction of the axis of the air intake passage, the guide vanes are arranged along the radial direction of the axis of the air intake passage, and the guide vanes are rotatably connected to the air intake cylinder;

[0011] A sealing bracket, the sealing bracket is arranged on the outer wall of the shell and is sealed with the outer wall of the shell; the sealing bracket is provided with a through sealing cavity;

[0012] a transmission shaft, the transmission shaft sequentially passing through the sealing cavity and the housing; the transmission shaft is connected to a driving assembly driving the transmission shaft to rotate; an annular protrusion is provided on the portion of the transmission shaft located in the sealing cavity, and a concave cavity matching the annular protrusion is provided in the sealing cavity; a first bearing is provided between the transmission shaft and the sealing cavity wall;

[0013] A guide vane adjustment assembly is arranged on the intake cylinder, and the transmission shaft is connected to the guide vane through the guide vane adjustment assembly.

[0014] As a preferred technical solution, the first bearing is configured as a self-lubricating bearing, and the first bearing is located between the annular protrusion and the housing.

[0015] As a preferred technical solution, a sleeve is provided between the sealing cavity wall and the transmission shaft, and the annular protrusion is located between the first bearing and the sleeve.

[0016] As a preferred technical solution, a gland threadedly connected to the sealing cavity is provided in the sealing cavity, the shaft sleeve is located between the annular protrusion and the gland, and the gland abuts against the shaft sleeve.

[0017] As a preferred technical solution, a first sealing element is embedded between the outer peripheral surface of the annular protrusion and the sealing cavity wall.

[0018] As a preferred technical solution, the first sealing element is provided in a plurality of strips, and the plurality of first sealing elements are distributed along the axial direction of the transmission shaft;

[0019] And / or, a positioning groove is provided on the outer peripheral surface of the annular protrusion at a position corresponding to the first sealing element;

[0020] And / or, the driving assembly is fixed on the sealing bracket;

[0021] And / or, the driving component is configured as an angular stroke actuator;

[0022] And / or, a second sealing element is embedded between the sealing bracket and the outer wall of the housing.

[0023] As a preferred technical solution, the guide vane adjustment assembly includes a transmission ring, which is rotatably arranged on the intake cylinder, the transmission ring can rotate around the axis of the intake passage, and a plurality of shift rods are provided on the transmission ring; the guide vane includes a blade and a guide vane shaft fixedly connected to the blade, the guide vane shaft passes through the intake cylinder and is rotatably connected to the intake cylinder, and a shift fork is provided on the portion of the guide vane shaft passing through the intake cylinder; the shift rods correspond to the shift forks one by one; one of the shift forks is transmission-connected to the transmission shaft to form an active shift fork, and the remaining shift forks form driven shift forks.

[0024] As a preferred technical solution, the active shift fork is located between the transmission shaft and the guide vane shaft, and the end of the transmission shaft and the active shift fork are connected via a keyway transmission connection;

[0025] And / or, the active shift fork is connected to the guide vane shaft via a keyway transmission;

[0026] And / or, the sum of the number of the active shift forks and the number of the driven shift forks is the same as the number of the guide vanes.

[0027] As a preferred technical solution, one end of the air intake cylinder extends out from the shell, and the end of the air intake cylinder extending out from the shell is fixedly connected to the end of the shell by bolts.

[0028] As a preferred technical solution, a third sealing element is embedded between the connecting surface of the air inlet cylinder and the housing.

[0029] The beneficial effects of the utility model are as follows:

[0030] 1. The transmission shaft of the utility model passes through the sealing cavity and the shell on the sealing bracket in sequence, and the swing angle of the guide vane can be adjusted through the guide vane adjustment component, and the overall structure is compact; the sealing bracket is an integral component, and the connection structure between the shell and the transmission shaft is simple and stable; at the same time, the sealing bracket and the transmission shaft can be conveniently installed and disassembled as a whole.

[0031] 2. The utility model utilizes a first sealing element between the annular protrusion and the sealing cavity wall, a second sealing element between the sealing bracket and the outer wall of the shell, and a third sealing element between the connecting surface of the intake cylinder and the shell to further improve the sealing effect of the intake channel and effectively avoid leakage of high-pressure gas medium.

[0032] 3. The utility model can realize the rotational connection between the transmission shaft and the sealing bracket through the first bearing. At the same time, the gland, the sleeve, the first bearing and the annular protrusion of the transmission shaft cooperate together to stably position the transmission shaft in the circumferential and axial directions. The structure is simple and can ensure the sealing effect of the first sealing element.

[0033] 4. The transmission ring of the guide vane adjustment assembly of the utility model is rotatably arranged on the intake cylinder, and the lever on the transmission ring can be conveniently matched with the active fork and the driven fork on the guide vane shaft, which is convenient for installation and disassembly. At the same time, the replacement of the first bearing and the shaft sleeve is also easier, which simplifies the transmission structure and significantly improves the reliability and economy of the centrifugal compressor. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 It is a schematic diagram of the overall structure of an embodiment of a centrifugal compressor guide vane transmission seal structure of the utility model;

[0035] Figure 2 for Figure 1 A magnified image of area A;

[0036] Figure 3 for Figure 1 Enlarged view of area B;

[0037] Figure 4 for Figure 1 Rear view with the shell hidden.

[0038] In the figure: 1-housing, 2-intake cylinder, 21-intake channel, 22-third sealing element, 3-guide vane, 31-blade, 32-guide vane shaft, 33-driven fork, 4-sealing bracket, 41-sealing chamber, 42-second sealing element, 5-transmission shaft, 51-drive assembly, 52-annular protrusion, 53-first sealing element, 54-first bearing, 55-sleeve, 56-pressure cover, 57-active fork, 61-transmission ring, 62-shift rod. DETAILED DESCRIPTION

[0039] In order to facilitate understanding by those skilled in the art, the present invention is further described below in conjunction with the accompanying drawings.

[0040] Please refer to Figure 1-Figure 4, is an embodiment of a centrifugal compressor guide vane transmission sealing structure provided by the utility model, comprising a housing 1, an impeller rotating at high speed in the housing 1 to generate velocity energy and pressure energy for the gas medium; an intake cylinder 2 is fixedly connected to the housing 1, and the intake cylinder 2 extends into the housing 1; the intake cylinder 2 is formed with an intake channel 21 connected to the impeller, and the intake channel 21 can continuously guide the gas medium to the impeller; a plurality of guide vanes 3 are arranged in the intake channel 21, and the plurality of guide vanes 3 are distributed circumferentially along the axis of the intake channel 21, and the guide vanes 3 are arranged radially along the axis of the intake channel 21, and the guide vanes 3 are rotatably connected to the intake cylinder 2, and the guide vanes 3 can adjust the swing angle by rotation, which can play the role of adjusting the flow rate of the gas medium entering, causing the gas medium entering the impeller to generate pre-rotation, and improving the aerodynamic efficiency; a sealing bracket 4 is arranged on the outer wall of the housing 1 and is sealed to the outer wall of the housing 1, and a through sealing cavity 4 is provided on the sealing bracket 4 1, the transmission shaft 5 passes through the sealing cavity 41 and the shell 1 in sequence, an annular protrusion 52 is provided on the part of the transmission shaft 5 located in the sealing cavity 41, a concave cavity matching the annular protrusion 52 is provided in the sealing cavity 41, a first sealing element 53 is embedded between the outer peripheral surface of the annular protrusion 52 and the wall of the sealing cavity 41, the first sealing element 53 can effectively ensure the sealing between the transmission shaft 5 and the sealing bracket 4, while the sealing bracket 4 is sealed and connected to the outer wall of the shell 1, the rotating seal between the annular protrusion 52 and the wall of the sealing cavity 41 can effectively seal the high-pressure gas medium; the transmission shaft 5 and the wall of the sealing cavity 41 are rotationally connected through the first bearing 54, the transmission shaft 5 is connected to a driving component 51 for driving it to rotate, the guide vane adjustment component is arranged on the intake cylinder 2, the transmission shaft 5 is transmission-connected to the guide vane 3 through the guide vane adjustment component, and the rotation of the transmission shaft 5 can drive all the guide vanes 3 to synchronously adjust the swing angle through the guide vane adjustment component.

[0041] For clarification, please refer to Figure 1 and Figure 2 The first sealing element 53 is preferably provided in multiple strips, and the multiple first sealing elements 53 are distributed along the axial direction of the transmission shaft 5, which can effectively improve the sealing effect; further, a positioning groove should be provided on the outer peripheral surface of the annular protrusion 52 corresponding to the first sealing element 53, and part of the first sealing element 53 is embedded in the positioning groove, which can better position the first sealing element 53 and ensure the sealing effect.

[0042] For further information, please refer to Figure 1 and Figure 2 In order to ensure the sealing effect between the sealing bracket 4 and the outer wall of the housing 1, a second sealing element 42 is preferably embedded between the sealing bracket 4 and the outer wall of the housing 1. The sealing bracket 4 can simultaneously achieve sealing of the gas medium and support of the transmission shaft 5.

[0043] For further information, please refer to Figure 1-Figure 3The driving assembly 51 is fixed to the upper end of the sealing bracket 4 by bolts, and the driving assembly 51 is preferably configured as an angular stroke actuator.

[0044] In this embodiment, please refer to Figure 1 and Figure 2 The first bearing 54 is located between the annular protrusion 52 and the housing 1, a sleeve 55 is provided between the wall of the sealing cavity 41 and the transmission shaft 5, and the annular protrusion 52 is located between the first bearing 54 and the sleeve 55. While ensuring the smooth circumferential rotation of the transmission shaft 5, the first bearing 54 and the sleeve 55 clamp the annular protrusion 52, and can position the transmission shaft 5 in the axial direction.

[0045] Based on the above examples, please refer to Figure 1 and Figure 2 A gland 56 threadedly connected to the sealing cavity 41 is provided in the sealing cavity 41, and the sleeve 55 is located between the annular protrusion 52 and the gland 56. The gland 56 abuts against the sleeve 55. Rotating the gland 56 can compress the sleeve 55. The high-pressure gas medium generates an upward force on the transmission shaft 5, which can be transmitted to the gland 56 through the sleeve 55, further improving the stability of the axial positioning of the transmission shaft 5.

[0046] It should be noted that the first bearing 54 is preferably a self-lubricating bearing, specifically a graphite brass bearing, which can effectively prevent dry grinding between the transmission shaft 5 and the sealing bracket 4; the sleeve 55 is preferably a brass sleeve.

[0047] In this embodiment, please refer to Figure 1-Figure 3 The guide vane adjustment assembly includes a transmission ring 61, which is rotatably arranged on the intake cylinder 2 through a bearing. The transmission ring 61 can rotate around the axis of the intake passage 21, and a plurality of levers 62 are provided on the transmission ring 61; at the same time, the guide vane 3 includes a blade 31 and a guide vane shaft 32 fixedly connected to the blade 31, the guide vane shaft 32 passes through the intake cylinder 2 and is rotatably connected to the intake cylinder 2 through a bearing, and a fork is provided on the part of the guide vane shaft 32 passing through the intake cylinder 2, and the lever 62 corresponds to the fork one by one, and the lever 62 extends into the groove formed by the fork to achieve cooperation; one fork is transmission-connected to the transmission shaft 5 to form an active fork 57, and the remaining forks form a driven fork 33. When the transmission shaft 5 drives the active fork 57 to rotate, the active fork 57 drives the transmission ring 61 to rotate through the lever 62 inside it, and the other levers 62 on the transmission ring 61 can then drive the blade 31 to swing through the driven fork 33, thereby achieving the adjustment of the swing angle of the guide vane 3.

[0048] Based on the above examples, please refer to Figure 1-Figure 3, the transmission shaft 5 is transmission connected to a guide vane shaft 32 directly below it, and the rotation of the transmission shaft 5 can directly drive a guide vane 3 to swing; specifically, the active fork 57 is located between the transmission shaft 5 and the guide vane shaft 32, and the end of the transmission shaft 5 and the active fork 57 as well as the active fork 57 and the guide vane shaft 32 are preferably connected through a keyway transmission. When the first bearing 54 needs to be replaced, the drive assembly 51 is removed and the end cover 56 is opened. At this time, the transmission shaft 5 can be easily taken out to replace the first bearing 51; when the guide vane adjustment assembly needs to be taken out, the transmission shaft 5 is taken out without affecting the disassembly and assembly of the guide vane adjustment assembly; when the guide vane adjustment assembly is installed, there is no need for too much adjustment, and the transmission shaft 5 can be conveniently connected to the active fork 57; the transmission shaft 5, the active fork 57 and the guide vane shaft 32 can rotate synchronously, which is convenient for installation, disassembly and maintenance.

[0049] It should be noted that the sum of the number of active shift forks 57 and driven shift forks 33 should be the same as the number of guide vanes 3 . When the transmission shaft 5 rotates, all guide vanes 3 can be made to swing synchronously through the transmission ring 61 .

[0050] In this embodiment, please refer to Figure 1 One end of the air intake cylinder 2 extends out from the shell 1, and the end of the air intake cylinder 2 extending out of the shell 1 is fixedly connected to the end of the shell 1 by bolts, so that the air intake cylinder 2 can be conveniently fixed on the shell 1; further, in order to improve the sealing performance, a third sealing element 22 is preferably embedded between the connecting surfaces of the air intake cylinder 2 and the shell 1.

[0051] It should be noted that the first sealing element 53, the second sealing element 42 and the third sealing element 22 are preferably configured as O-rings; in other embodiments, the first sealing element 53, the second sealing element 42 and the third sealing element 22 may also be configured as sealing tapes to ensure the sealing effect.

[0052] The above description is only the preferred embodiment of the utility model, and is not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A centrifugal compressor guide vane transmission seal structure, characterized in that: include: Housing (1); An air intake cylinder (2), the air intake cylinder (2) being fixedly connected to the housing (1), the air intake cylinder (2) extending into the housing (1); the air intake cylinder (2) forming an air intake passage (21); a plurality of guide vanes (3) being arranged in the air intake passage (21), the plurality of guide vanes (3) being distributed circumferentially along the axis of the air intake passage (21), the guide vanes (3) being arranged radially along the axis of the air intake passage (21), and the guide vanes (3) being rotatably connected to the air intake cylinder (2); A sealing bracket (4), the sealing bracket (4) being arranged on the outer wall of the shell (1) and being sealingly connected to the outer wall of the shell (1); a through sealing cavity (41) is provided on the sealing bracket (4); a transmission shaft (5), the transmission shaft (5) passing through the sealing cavity (41) and the housing (1) in sequence; the transmission shaft (5) is connected to a driving assembly (51) for driving the transmission shaft (5) to rotate; an annular protrusion (52) is provided on the portion of the transmission shaft (5) located in the sealing cavity (41), and a concave cavity matching the annular protrusion (52) is provided in the sealing cavity (41); a first bearing (54) is provided between the transmission shaft (5) and the wall of the sealing cavity (41); A guide vane adjustment assembly, wherein the guide vane adjustment assembly is arranged on the intake cylinder (2), and the transmission shaft (5) is transmission-connected to the guide vane (3) via the guide vane adjustment assembly.

2. A centrifugal compressor guide vane transmission seal structure according to claim 1, characterized in that: The first bearing (54) is configured as a self-lubricating bearing, and the first bearing (54) is located between the annular protrusion (52) and the housing (1).

3. A centrifugal compressor guide vane transmission seal structure according to claim 2, characterized in that: A shaft sleeve (55) is provided between the wall of the sealing cavity (41) and the transmission shaft (5), and the annular protrusion (52) is located between the first bearing (54) and the shaft sleeve (55).

4. A centrifugal compressor guide vane transmission seal structure according to claim 3, characterized in that: A pressure cover (56) threadedly connected to the sealing cavity (41) is provided in the sealing cavity (41), the shaft sleeve (55) is located between the annular protrusion (52) and the pressure cover (56), and the pressure cover (56) abuts against the shaft sleeve (55).

5. The centrifugal compressor guide vane transmission seal structure according to claim 1, characterized in that: A first sealing element (53) is embedded between the outer peripheral surface of the annular protrusion (52) and the wall of the sealing cavity (41).

6. A centrifugal compressor guide vane transmission seal structure according to claim 5, characterized in that: The first sealing elements (53) are provided in a plurality, and the plurality of first sealing elements (53) are distributed along the axial direction of the transmission shaft (5); And / or, a positioning groove is provided on the outer peripheral surface of the annular protrusion (52) at a position corresponding to the first sealing element (53); And / or, the driving assembly (51) is fixed on the sealing bracket (4); And / or, the driving component (51) is configured as an angular stroke actuator; And / or, a second sealing element (42) is embedded between the sealing bracket (4) and the outer wall of the housing (1).

7. A centrifugal compressor guide vane transmission seal structure according to claim 1, characterized in that: The guide vane adjustment assembly comprises a transmission ring (61), the transmission ring (61) is rotatably arranged on the intake cylinder (2), the transmission ring (61) can rotate around the axis of the intake passage (21), and a plurality of shifting rods (62) are arranged on the transmission ring (61); the guide vane (3) comprises a blade (31) and a guide vane shaft (32) fixedly connected to the blade (31), the guide vane shaft (32) passes through the intake cylinder (2) and is rotatably connected to the intake cylinder (2), and a shifting fork is arranged on the portion of the guide vane shaft (32) passing through the intake cylinder (2); the shifting rod (62) corresponds to the shifting fork one by one; one of the shifting forks is transmission-connected to the transmission shaft (5) to form an active shifting fork (57), and the remaining shifting forks form driven shifting forks (33).

8. A centrifugal compressor guide vane transmission seal structure according to claim 7, characterized in that: The active shift fork (57) is located between the transmission shaft (5) and the guide vane shaft (32), and the end of the transmission shaft (5) and the active shift fork (57) are connected to each other via a keyway transmission connection; And / or, the active shift fork (57) and the guide vane shaft (32) are connected via a keyway transmission; And / or, the sum of the number of the active shift forks (57) and the number of the driven shift forks (33) is the same as the number of the guide vanes (3).

9. The centrifugal compressor guide vane transmission seal structure according to claim 1, characterized in that: One end of the air intake cylinder (2) extends out from the shell (1), and the end of the air intake cylinder (2) extending out from the shell (1) is fixedly connected to the end of the shell (1) by means of bolts.

10. A centrifugal compressor guide vane transmission seal structure according to claim 9, characterized in that: A third sealing element (22) is embedded between the connecting surfaces of the air intake cylinder (2) and the housing (1).

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