CN116025590A

CN116025590A - Centrifugal compressor

Info

Publication number: CN116025590A
Application number: CN202310151968.3A
Authority: CN
Inventors: 郭中纬
Original assignee: Tailingte Compressor Wuxi Co ltd
Current assignee: Tailingte Compressor Wuxi Co ltd
Priority date: 2023-02-22
Filing date: 2023-02-22
Publication date: 2023-04-28

Abstract

The utility model belongs to the technical field of compressors, and discloses a centrifugal compressor which comprises a gear box body, an input shaft penetrating through the gear box body, a large gear arranged on the input shaft and positioned in the gear box body, a first transmission shaft penetrating through the gear box body, the middle part of the first transmission shaft meshed with the large gear, a second transmission shaft penetrating through the gear box body, the middle part of the second transmission shaft meshed with the large gear, and a first volute assembly arranged at one end of the first transmission shaft and sealed with the gear box body, wherein the first transmission shaft and the second transmission shaft are respectively positioned at two sides of the input shaft, the first volute assembly and the third volute assembly are positioned at the same side of the gear box body, and the second volute assembly and the fourth volute assembly are positioned at the same side of the gear box body. The reliability and stability of the guide vane opening adjustment can be improved.

Description

Centrifugal compressor

Technical Field

The utility model belongs to the technical field of compressors, and relates to a centrifugal compressor, in particular to a centrifugal compressor with an adjustable opening degree of an inlet guide vane.

Background

The gas compressor is a power device for converting mechanical energy into gas pressure energy, is commonly used for pneumatic tools to provide gas power, and is also commonly used for pressure-feeding oxygen, hydrogen, ammonia, natural gas, coke oven gas, inert gas and other mediums in petrochemical industry, drilling and mining industries, metallurgy and other industries. Depending on the compression medium, a typical compressor may also be referred to as: air compressors, oxygen compressors, nitrogen compressors, hydrogen compressors, and the like.

The utility model of China patent application No. 201921282410.4 discloses a centrifugal compressor inlet guide vane adjusting device and a centrifugal compressor, wherein the inlet guide vane adjusting device comprises an actuating mechanism, the actuating mechanism is fixedly arranged on an air inlet end cover of a compressor shell through a fixed seat, a crank shaft sleeve is arranged on the air inlet end cover, and the actuating mechanism comprises an action rod, a universal joint fork, a connecting rod, a crank shaft, a first linkage plate, a middle ring body and a second linkage plate which is uniformly distributed on the middle ring body; the action rod drives the crank to rotate through the universal joint fork and the connecting rod, the crank drives the crank shaft penetrating through the crank shaft sleeve to rotate, the crank shaft drives the intermediate ring body to rotate through the first linkage plate, and meanwhile, the intermediate ring body drives the inlet guide vane to rotate through the second linkage plate and the guide vane crank. This application passes through fixing base and end cover fixed mounting that admits air, and actuating mechanism's action bars pass through universal joint fork and connecting rod drive crank rotation, and the crank drives the crank axle rotation, and the crank axle passes crank axle sleeve and passes through the middle ring body rotation of first linkage board drive, and the second linkage board that middle ring body circumference distributes drives the guide vane crank rotation that corresponds on the guide vane bracket to make the synchronous rotation of import guide vane certain angle, the reliability of this kind of structure has the promotion space with the leak protection ability.

Disclosure of Invention

The present utility model is directed to a centrifugal compressor, which solves the above-mentioned problems.

In order to achieve the above purpose, the present utility model provides the following technical solutions: the centrifugal compressor comprises a gear box body, an input shaft penetrating the gear box body and the end part of the input shaft is connected with a motor, a large gear arranged on the input shaft and positioned in the gear box body, a first transmission shaft penetrating the gear box body and the middle part of the first transmission shaft is meshed with the large gear, a second transmission shaft penetrating the gear box body and the middle part of the second transmission shaft is meshed with the large gear, a first volute assembly arranged at one end of the first transmission shaft and sealed with the gear box body, a second volute assembly arranged at the other end of the first transmission shaft and sealed with the gear box body, a third volute assembly arranged at one end of the second transmission shaft and sealed with the gear box body, a fourth volute assembly arranged at the other end of the second transmission shaft and sealed with the gear box body, and a guide vane opening adjusting assembly arranged at the outer end part of the first volute assembly, wherein the first transmission shaft and the second transmission shaft are respectively positioned at two sides of the input shaft, the first volute assembly and the third volute assembly are positioned at the same side of the gear box body, and the second volute assembly and the fourth volute assembly are positioned at the same side of the gear box body; the guide vane opening adjusting assembly comprises an air inlet adjusting guide shell mechanism and a reducer pipe arranged between the air inlet adjusting guide shell mechanism and the first volute assembly;

the air inlet adjusting guide shell mechanism comprises a guide shell, a plurality of groups of inlet guide vane units which are adjustably arranged on the guide shell and extend into the guide shell to be matched with each other, and a driving rod which is connected with any group of inlet guide vane units to drive the inlet guide vane units to rotate,

each group of inlet guide vane units comprises an inlet guide vane rod assembly, a shifting fork piece, a transmission ring body and shifting fork connecting rods, wherein the inlet guide vane rod assembly penetrates through the guide shell in a rotatable mode, the shifting fork piece is sleeved at the outer end portion of the inlet guide vane rod assembly, the transmission ring body is rotatably sleeved on the guide shell through a plurality of rollers installed on the side faces of the transmission ring body, the shifting fork connecting rods are formed on the outer peripheral face of the transmission ring body and matched with the shifting fork piece, the driving rods are connected with any one shifting fork piece, and each inlet guide vane rod assembly comprises an inlet guide vane arranged in the guide shell and a vane shaft, one end of each vane shaft penetrates through the guide shell to be connected with the shifting fork piece;

the first volute assembly comprises a first volute, a guide body, an impeller, a diffuser and an air seal structure, wherein the guide body is installed on the end face of the first volute and connected with the reducer pipe, the impeller is installed at one end of the first transmission shaft and positioned between the first volute and the guide body, the diffuser is installed between the first volute and the guide body and positioned on the outer ring of the impeller, and the air seal structure is arranged between the first transmission shaft and the first volute and positioned on the inner side of the impeller;

the gearbox casing comprises a gearbox casing penetrated by the first transmission shaft, an oil seal structure arranged between the gearbox casing and the first transmission shaft and adjacent to the air seal structure, a multi-petal bearing pad sleeved on the first transmission shaft and positioned on the inner side of the oil seal structure, and a bearing arranged between the bearing pad and the gearbox casing.

Optimally, the air inlet adjusting guide shell mechanism also comprises an outer ring support sealing unit which is arranged on the peripheral surface of the guide shell and encloses a closed cavity with the guide shell,

the flow guiding shell comprises a hollow pipe body, a first installation end plate formed at one end of the hollow pipe body, and a second installation end plate formed at the other end of the hollow pipe body;

the outer ring supports the sealing unit including set up in the sealing ring body outside the hollow tube body, form sealing ring body one end and install to the third installation end plate on first installation end plate surface, form sealing ring body other end and install fourth installation end plate on the second installation end plate global, set up spacing seat on the sealing ring body global, support respectively through the backup pad third installation end plate with support diaphragm on the fourth installation end plate and offer dodge the hole on the support diaphragm, the actuating lever rotationally installs in the spacing seat.

Further, a first annular groove is formed in the outer peripheral surface of the second installation end plate, and a first sealing ring is arranged in the first annular groove; the outer surfaces of the third installation end plate and the fourth installation end plate are provided with second annular grooves independently, and second sealing rings are arranged in the second annular grooves;

a limiting ring groove is formed in the outer peripheral surface of the hollow pipe body, and a plurality of rollers are rotatably arranged in the limiting ring groove;

the outer peripheral surface of the hollow pipe body is provided with a plurality of blade shaft seats corresponding to the blade shafts one by one, the blade shafts are rotatably arranged in the blade shaft seats, and the transmission ring body is positioned between the plurality of blade shaft seats and the limiting ring groove.

Still further, each of the vane shafts is rotatably mounted within each of the vane shaft bases by a self-lubricating bearing,

a third annular groove is formed in the outer peripheral surface of the self-lubricating bearing, and a third sealing ring is arranged in the third annular groove;

a fourth annular groove and a fifth annular groove positioned on the outer ring of the fourth annular groove are formed in the outer peripheral surface of each blade shaft, and fourth sealing rings are independently arranged in the fourth annular groove and the fifth annular groove;

the shifting fork piece is connected with the driving rod through a connecting key, and the shifting fork connecting rod is movably connected with the shifting fork piece through a connecting shaft on the shifting fork connecting rod;

the outer circumferential surface of the driving rod is provided with a sixth annular groove and a seventh annular groove positioned on the outer ring of the sixth annular groove, and fifth sealing rings are arranged in the sixth annular groove and the seventh annular groove independently.

Further, the reducer pipe comprises a first flange ring body arranged on the outer end face of the fourth installation end plate, a second flange ring body arranged on the outer end face of the guide body, and an air inlet guide shell body connected with the first flange ring body and the second flange ring body, the diameter of the air inlet guide shell body is gradually reduced in the direction from the first flange ring body to the second flange ring body, and the inner wall of the air inlet guide shell body is provided with a first annular surface at the joint of the inner wall and the first flange ring body and a second annular surface at the joint of the inner wall and the second flange ring body.

Optimally, an eighth annular groove is formed in the inner side surface of the flow guide body, a ninth annular groove is formed in the end surface of the flow guide body, sixth sealing rings are arranged in the eighth annular groove and the ninth annular groove independently of each other, and the eighth annular groove and the ninth annular groove are shielded and sealed by the surface of the first volute; a plurality of air seal balance air holes are formed in the air seal structure, two tenth annular grooves positioned on two sides of the air seal balance air holes are formed in the outer peripheral surface of the air seal structure, and a seventh sealing ring is arranged in each tenth annular groove.

Optimally, a convex ring body is formed on the end face, opposite to the gear box body, of the first volute, a concave ring groove matched with the convex ring body is formed on the end face, opposite to the first volute, of the gear box shell, an eleventh ring groove is formed on the peripheral surface of the convex ring body, and an eighth sealing ring is arranged in the eleventh ring groove.

Further, the outer ring support sealing unit is further provided with a protective gas charging hole and a protective gas discharging hole which are communicated with the closed cavity, a pressure sensor is arranged at the protective gas charging hole, the protective gas discharging hole is connected with the gas recovery container through a first gas pipe, the gear box shell is provided with a leakage-proof gas hole, and the leakage-proof gas hole is connected with the gas recovery container through a second gas pipe.

Further, the impeller includes that the center has seted up impeller body in shaft hole and equidistant formation just spiral extension's multiunit blade group on the impeller body surface, the impeller body passes through the shaft hole suit is in the tip of first transmission shaft, every group the blade group is including interval setting and area taper's first blade, second blade and third blade, first blade the second blade with the inner tip of third blade aligns and the outer tip is not aligned.

Optimally, a plurality of pattern grooves and an oil bearing hole which are arranged at intervals are formed in the outer surface of each bearing block, limit stops are arranged on two sides of each bearing block, a plurality of oil inlet holes corresponding to the oil bearing holes are formed in each bearing, and oil nozzles with the section size reduced inwards are arranged in the oil inlet holes.

Compared with the prior art, the utility model has the beneficial effects that: according to the centrifugal compressor, the guide vane opening adjusting assembly with a specific structure is matched with the gear box body, the large gear, the volute components and the like, so that the reliability and the stability of guide vane opening adjustment can be improved.

Drawings

FIG. 1 is a schematic view of a centrifugal compressor according to the present utility model;

FIG. 2 is a cross-sectional view of FIG. 1;

FIG. 3 is a cross-sectional view of a vane opening adjustment assembly in a centrifugal compressor according to the present utility model;

FIG. 4 is an enlarged view of a portion of FIG. 3;

FIG. 5 is a front view of FIG. 3;

FIG. 6 is a front view of an impeller in a centrifugal compressor according to the present utility model;

FIG. 7 is a cross-sectional view of FIG. 6;

FIG. 8 is a schematic view of the structure of the bearings and bearing pads in the centrifugal compressor of the present utility model;

1, a gear box body; 2. a first volute assembly; 3. a second volute assembly; 4. a third volute assembly; 5. a fourth volute assembly; 6. a guide vane opening adjustment assembly;

10. a gearbox housing; 101. a concave ring groove; 11. an input shaft; 12. a large gear; 13. a first drive shaft; 14. an oil seal structure; 15. a bearing; 151. an oil inlet hole; 16. a bearing pad; 161. pattern grooves; 162. an oil bearing hole; 163. a limit stop;

21. a first volute; 210. a convex ring body; 211. an eleventh ring groove; 22. a flow guide body; 23. an impeller; 231. an impeller body; 232. a shaft hole; 233. a blade group; 2331. a first blade; 2332. a second blade; 2333. a third blade; 24. an eighth ring groove; 25. a ninth ring groove; 26. an air seal structure; 261. air seal balance air holes; 27. a diffuser; 28. a tenth ring groove;

601. a shielding gas charging hole; 602. a shielding gas bleed hole; 61. an air intake adjusting guide shell mechanism; 611. a deflector housing; 6111. a hollow tube body; 6112. a first mounting end plate; 6113. a second mounting end plate; 6114. a closed cavity; 6115. a blade shaft seat; 6116. a first ring groove; 6117. a limit ring groove; 612. an outer ring supporting sealing unit; 6121. a seal ring body; 6122. a fourth mounting end plate; 6123. a third mounting end plate; 6124. a second ring groove; 6125. a limit seat; 6126. a support plate; 6127. a supporting cross plate; 6128. avoidance holes; 613. an inlet guide vane unit; 6131. self-lubricating bearings; 61311. a third ring groove; 6132. an inlet guide vane rod assembly; 61321. inlet guide vanes; 61322. a blade shaft; 61323. a fourth ring groove; 61324. a fifth ring groove; 6133. a fork member; 61331. a connecting key; 6134. a roller; 6135. a transmission ring body; 6136. a fork connecting rod; 61361. a connecting shaft; 614. a driving rod; 6141. a sixth ring groove; 6142. a seventh ring groove; 62. a reducer pipe; 621. a first flange ring body; 622. a second flange ring body; 623. an air inlet guide shell; 6231. a first annulus; 6232. a second annulus.

Detailed Description

The following detailed description of the preferred embodiments of the present utility model will be provided in connection with.

The centrifugal compressor as shown in fig. 1 and 2 mainly comprises a gear box body 1, a first volute assembly 2, a second volute assembly 3, a third volute assembly 4, a fourth volute assembly 5, a guide vane opening adjusting assembly 6 and the like.

The input shaft 11 penetrates the gear housing 1 and is generally located in the middle of the gear housing 1, and an end portion of the input shaft is connected with the motor, so that the input shaft can rotate at a high speed under the drive of the motor. The gearwheel 12 is mounted on the input shaft 11 and is also located in the gear housing 1; when the input shaft 11 rotates, the large gear 12 rotates at a high speed in synchronization. The first transmission shaft 13 penetrates through the gear box body 1, and the middle part of the first transmission shaft is meshed with the large gear 12, so that the first transmission shaft is driven by the large gear 12 to synchronously rotate; the second transmission shaft also penetrates through the gear box body 1, and the middle part of the second transmission shaft is also meshed with the large gear 12, so that the second transmission shaft is driven by the large gear 12 to synchronously rotate; the first transmission shaft 13 and the second transmission shaft are located at both sides of the input shaft 11, respectively. The first volute component 2 is arranged at one end of the first transmission shaft 13 and is sealed with the gear box body 1, the second volute component 3 is arranged at the other end of the first transmission shaft 13 and is sealed with the gear box body 1, the third volute component 4 is arranged at one end of the second transmission shaft and is sealed with the gear box body 1, and the fourth volute component is arranged at the other end of the second transmission shaft and is sealed with the gear box body 1, so that the first volute component 2 and the third volute component 4 are positioned at the same side of the gear box body 1, the second volute component 3 and the fourth volute component 5 are positioned at the same side of the gear box body 1, and the whole structure can be seen in Chinese patent application number 202011554735.0; it should be noted that: only the specific structure of the first scroll casing 2 and the gear casing 1 (including the specific structure of the first scroll casing 2, the structure of the gear casing 1 matching with the first scroll casing 2, and the sealing structure between the first scroll casing 2 and the gear casing 1) is described in detail in this application, the specific structure of the second scroll casing 3, the third scroll casing 4, the fourth scroll casing 5 and the gear casing 1 (including the specific structure of the second scroll casing 3, the third scroll casing 4, and the fourth scroll casing 5, the structure of the gear casing 1 matching with each scroll casing and the sealing structure between each scroll casing and the gear casing 1) are substantially identical to the specific structure of the first scroll casing 2 and the gear casing 1, and only the differences in size (the sizes of the first scroll casing 2, the second scroll casing 3, the third scroll casing 4, and the fourth scroll casing 5 are gradually reduced) are not repeated herein.

The vane opening adjustment assembly 6 is mounted at the outer end (left end in fig. 2) of the first volute assembly 2, and includes an intake adjusting guide housing mechanism 61 and a reducer pipe 62 mounted between the intake adjusting guide housing mechanism 61 and the first volute assembly 2.

In the present embodiment, as shown in fig. 3 to 5, the intake adjusting guide housing mechanism 61 includes a guide housing 611, an outer ring supporting seal unit 612 mounted on the peripheral surface of the guide housing 611 and enclosing a closed cavity 6114 therewith, a plurality of groups of inlet guide vane units 613 adjustably mounted on the guide housing 611 and extending into the guide housing to be mutually engaged therewith, and a driving lever 614 connected with any one of the groups of inlet guide vane units 613 to drive rotation thereof.

Specifically, the flow guiding housing 611 includes a hollow tube body 6111, a first mounting end plate 6112 formed at one end of the hollow tube body 6111 (the forming manner is an existing conventional manner such as integral molding or welding, the same applies below), and a second mounting end plate 6113 formed at the other end of the hollow tube body 6111, and the centers of the first mounting end plate 6112 and the second mounting end plate 6113 are hollow to form a flow guiding structure in which the hollow tube body 6111 is a channel (in this embodiment, the outer diameter of the second mounting end plate 6113 is smaller than the outer diameter of the first mounting end plate 6112). The outer ring support sealing unit 612 includes a sealing ring body 6121 disposed outside the hollow tube body 6111, a third mounting end plate 6123 formed at one end of the sealing ring body 6121 and mounted to a surface of the first mounting end plate 6112, a fourth mounting end plate 6122 formed at the other end of the sealing ring body 6121 and mounted on a circumferential surface of the second mounting end plate 6113 (the dimensions of the third mounting end plate 6123 and the fourth mounting end plate 6122 are substantially identical), a limit seat 6125 disposed on the circumferential surface of the sealing ring body 6121, support cross plates 6127 supported on the third mounting end plate 6123 and the fourth mounting end plate 6122 through support plates 6126, respectively (i.e., support plates 6126 are disposed on the third mounting end plate 6123 and the fourth mounting end plate 6122, respectively, the support cross plates 6127 are formed on the two support plates 6126 and are parallel to the sealing ring body 6121), and a relief hole 6128 formed on the support cross plates 6127, and the driving rod 614 is rotatably mounted in the limit seat 6125, by using the relief hole 6128, the driving rod 614 can be externally connected to an external driving structure to rotate about its axis as a rotation axis 614. The cooperation (double-layer structure) of the diversion shell 611 and the outer ring support sealing unit 612 with such a structure can ensure the strength and the sealing reliability of the whole structure of the air inlet adjusting diversion shell mechanism 61, and is beneficial to ensuring the service life.

Each group of inlet guide vane units 613 comprises an inlet guide vane rod assembly 6132 which rotatably penetrates through the guide shell 611 (namely, the inlet guide vane rod assembly 6132 penetrates through the hollow pipe body 6111 and can rotate by taking the self axis as a rotating shaft under the action of external force), a shifting fork member 6133 sleeved at the outer end part of the inlet guide vane rod assembly 6132 (the shifting fork member 6133 and the inlet guide vane rod assembly 6132 can be connected by adopting the existing conventional connecting pieces such as keys and screws), a transmission ring body 6135 which is rotatably sleeved on the guide shell 611 through a plurality of rollers 6134 installed on the side surface (namely, the side surface of the transmission ring body 6135 is pivoted with a plurality of rollers 6134 which are arranged at equal intervals, and the outer peripheral surface of the rollers 6134 slightly exceeds the inner peripheral surface of the transmission ring body 6135), so that the transmission ring body 6135 can rotate by taking the self axis as the rotating shaft through the rollers 6134), and a shifting fork connecting rod 6136 which is formed on the outer peripheral surface of the transmission ring body 6135 and is matched with the shifting fork member 6133. The driving rod 614 is connected to any one of the fork members 6133 (the fork member 6133 connected to the driving rod 614 may be defined as a main fork member), and the inlet guide vane rod assembly 6132 includes an inlet guide vane 61321 disposed in the guide shell 611 and a vane shaft 61322 having one end connected to the inlet guide vane 61321 and penetrating the guide shell 611 to be connected to the fork member 6133 (i.e., a hollow tube 6111 of the guide shell 611 is provided with a plurality of through holes at equal intervals for passing the vane shaft 61322 therethrough, and an outwardly extending vane shaft seat 6115 is disposed at the through holes). Specifically, the fork member 6133 is connected with the driving rod 614 through a connecting key 61331, and the fork connecting rod 6136 is movably connected with the fork member 6133 through a connecting shaft 61361 thereon; when in use, the external driving structure drives the driving rod 614 to rotate by taking the axial lead of the driving rod as a rotating shaft, the main shifting fork piece and the blade shaft 61322 synchronously rotate, the main shifting fork piece drives the transmission ring body 6135 to roll relative to the hollow tube 6111 through the plurality of rollers 6134, and further synchronously drives the rotation of the other shifting fork pieces 6133 and the other blade shafts 61322, so that the opening degree of the inlet guide vane 61321 in the air inlet adjusting guide shell mechanism 61 is adjusted (note that in the initial state, the plurality of inlet guide vanes 61321 are in the same plane and are mutually matched, at the moment, a small ventilation structure is formed between the inner end parts of the plurality of inlet guide vanes 61321, the air flow is very small, as shown in fig. 3), and the reliability and the stability are very good.

In the present embodiment, the first volute assembly 2 includes a first volute 21, a fluid director 22 mounted on an end surface of the first volute 21 and connected to a reducer 62, an impeller 23 mounted on one end of the first transmission shaft 13 and located between the first volute 21 and the fluid director 22, a diffuser 27 mounted between the first volute 21 and the fluid director 22 and located on an outer ring of the impeller 23, and an air seal structure 26 disposed between the first transmission shaft 13 and the first volute 21 and located inside the impeller 23; the gear housing 1 includes a gear housing 10 penetrated by a first transmission shaft 13 (the gear housing 10 is also penetrated by a second transmission shaft, an input shaft 11), an oil seal structure 14 (the gas seal structure 26, the oil seal structure 14 are conventional) installed between the gear housing 10 and the first transmission shaft 13 and provided adjacent to the gas seal structure 26, a multi-lobe bearing pad 16 fitted over the first transmission shaft 13 and located inside the oil seal structure 14 (the inside is opposite: the side closer to the center of the gear housing 1 is defined as the inside as shown in fig. 2), and a bearing 15 installed between the multi-lobe bearing pad 16 and the gear housing 10.

In the embodiment, a first annular groove 6116 is formed on the outer peripheral surface of the second mounting end plate 6113, and a first sealing ring is arranged in the first annular groove 6116; the outer surfaces of the third mounting end plate 6123 and the fourth mounting end plate 6122 are provided with a second annular groove 6124 independently, and a second sealing ring is arranged in the second annular groove 6124; this serves to further secure the tightness between the guide housing 611 and the outer ring support sealing unit 612, avoiding leakage of gas through the closed cavity. The outer peripheral surface of the hollow pipe body 6111 is provided with a limit ring groove 6117, and a plurality of rollers 6134 are rotatably arranged in the limit ring groove 6117; therefore, the rollers 6134 can be limited, so that the rollers 6134 can rotate in the same plane, small-angle deviation generated during rotation is avoided, the additional stress borne by the transmission ring body 6135 is reduced, and the service life is prolonged. The outer peripheral surface of the hollow tube body 6111 is provided with a plurality of blade shaft seats 6115 which are in one-to-one correspondence with the blade shafts 61322, the blade shafts 61322 are rotatably arranged in the blade shaft seats 6115, and the transmission ring body 6135 is positioned between the plurality of blade shaft seats 6115 and the limit ring groove 6117, so that the reliability of the air inlet adjusting guide shell mechanism 61 is further improved.

Specifically, each blade shaft 61322 is rotatably mounted within each blade shaft seat 6115 by self-lubricating bearings 6131 to reduce the resistance to rotation of the blade shaft 61322 and improve reliability. A third annular groove 61311 is formed in the outer peripheral surface of the self-lubricating bearing 6131, and a third sealing ring is arranged in the third annular groove 61311; a fourth annular groove 61323 and a fifth annular groove 61324 positioned on the outer ring of the fourth annular groove 61323 are formed in the outer peripheral surface of each blade shaft 61322, and fourth sealing rings are independently arranged in the fourth annular groove 61323 and the fifth annular groove 61324; a sixth annular groove 6141 is formed in the outer peripheral surface of the driving rod 614, a seventh annular groove 6142 is arranged on the outer ring of the sixth annular groove 6141, and fifth sealing rings are independently arranged in the sixth annular groove 6141 and the seventh annular groove 6142; this can further ensure the tightness between the self-lubricating bearing 6131, the vane shaft seat 6115 and the vane shaft 61322, and the tightness between the driving rod 614 and the limit seat, avoiding the outward leakage of gas therethrough.

In the present embodiment, the reducer 62 includes a first flange ring 621 mounted on the outer end face of the fourth mounting end plate 6122, a second flange ring 622 mounted on the outer end face of the baffle 22, and an intake air guide housing 623 connecting the first flange ring 621 and the second flange ring 622, the diameter of the intake air guide housing 623 gradually decreases in the direction from the first flange ring 621 to the second flange ring 622, the inner wall of the intake air guide housing 623 has a first annular surface 6231 at the connection with the first flange ring 621 and a second annular surface 6232 at the connection with the second flange ring 622, and such a structural design is advantageous for improving the intake air effect.

In the present embodiment, an eighth annular groove 24 is formed on the inner side surface of the current carrier 22, and a ninth annular groove 25 is formed on the end surface, sixth sealing rings are independently arranged in the eighth annular groove 24 and the ninth annular groove 25, and the eighth annular groove 24 and the ninth annular groove 25 are shielded and sealed by the surface of the first volute 21; a plurality of air seal balance air holes 261 are formed in the air seal structure 26, two tenth annular grooves 28 positioned on two sides of the air seal balance air holes 261 are formed in the outer peripheral surface of the air seal structure 26, and a seventh sealing ring is arranged in each tenth annular groove 28; a convex ring body 210 is formed on the end surface of the first volute casing 21 opposite to the gear case body 1, a concave ring groove 101 matched with the convex ring body 210 is formed on the end surface of the gear case housing 10 opposite to the first volute casing 21, an eleventh ring groove 211 is formed on the peripheral surface of the convex ring body 210, and an eighth sealing ring is arranged in the eleventh ring groove 211.

Although the above-described vane opening adjusting assembly 6 has excellent sealing properties, as its service life increases, there is a possibility that a seal ring (such as a plurality of seal rings in the axial direction of the vane shaft 61322) that is often used ages to leak gas. In this embodiment, the outer ring support sealing unit 612 is further provided with a protection gas charging hole 601 and a protection gas discharging hole 602 which are communicated with the closed cavity 6114, and a pressure sensor may be installed at the protection gas charging hole 601, and the protection gas discharging hole 602 is connected with a gas recovery container (the gas recovery container and the gas recovery container may be the same or different) through a first gas pipe, so that when the pressure value detected by the pressure sensor (i.e. the pressure value in the closed cavity 6114) exceeds a threshold value, an alarm can be given to remind a user to adjust the air leakage (especially the special gas of explosion, explosion or toxicity) of the diversion housing mechanism 61 by air intake, and maintenance is required.

It should be noted that: because of the good sealing performance of the whole centrifugal compressor, a small amount of residual gas in the centrifugal compressor can only scatter and overflow into the gear box shell along the surface of the first transmission shaft 13, and when the gas is special gas such as hydrogen, argon and the like, a recovery air hole can be formed in the gear box shell 10 and is connected with a gas recovery container through a second air pipe, so that leakage prevention and recovery of the special gas are realized.

As shown in fig. 6, the impeller 23 includes an impeller body 231 having a shaft hole 232 formed at the center thereof and a plurality of sets of blades 233 formed at equal intervals on the surface of the impeller body 231 and extending spirally, the impeller body 231 is fitted over the end portion of the first transmission shaft 13 through the shaft hole 232, each set of blades 233 includes a first blade 2331, a second blade 2332 and a third blade 2333 which are arranged at intervals and gradually decrease in area, the inner ends of the first blade 2331, the second blade 2332 and the third blade 2333 are aligned and the outer ends thereof are not aligned, at this time, the widths of the first blade 2331, the second blade 2332 and the third blade 2333 in the axial direction of the impeller 23 are gradually decreased (as shown in fig. 7, the size of the first blade 2331 in the axial direction of the impeller 23 is slightly smaller than the axial width of the impeller 23, the size of the second blade 2332 in the axial direction of the impeller 23 is 68% of the first blade 2331, and the size of the third blade 2333 in the axial direction of the impeller 23 is 74% of the second blade 2332 in the axial direction of the impeller 23, so that the high pressure ratio of the conveying gas can be improved.

As shown in fig. 8, a plurality of pattern grooves 161 and an oil bearing hole 162 which are arranged at intervals are formed on the outer surface of each multi-split bearing pad 16, and limit stops 163 are arranged on two sides of each multi-split bearing pad 16; a plurality of oil inlet holes 151 corresponding to the oil bearing holes 162 are formed in the bearing 15, and an oil nozzle with an inward reduced cross-sectional size is arranged in the oil inlet holes 151. Since the rotation speed of the first transmission shaft 13 can reach tens of thousands of revolutions per minute, the service life of the bearing pad 16 is influenced due to the fact that the temperature between the bearing 15 and the bearing pad 16 is too high, and the material of the bearing pad 16 is mainly improved at present, so that the cost is relatively high; the structure through to bearing pad 16 and bearing 15 is designed to this application, is favorable to improving the oil feed pressure and makes its evenly distributed to the surface of bearing pad 16 on, and then reduces its temperature, improves bearing pad 16's life.

The above embodiments are provided to illustrate the technical concept and features of the present utility model and are intended to enable those skilled in the art to understand the content of the present utility model and implement the same, and are not intended to limit the scope of the present utility model. All equivalent changes or modifications made in accordance with the spirit of the present utility model should be construed to be included in the scope of the present utility model.

Claims

1. A centrifugal compressor comprises a gear box body (1), an input shaft (11) penetrating through the gear box body (1) and the end part of the input shaft is connected with a motor, a large gear (12) installed on the input shaft (11) and located in the gear box body (1), a first transmission shaft (13) penetrating through the gear box body (1) and the middle part of the first transmission shaft is meshed with the large gear (12), a second transmission shaft penetrating through the gear box body (1) and the middle part of the first transmission shaft is meshed with the large gear (12), a first volute assembly (2) installed at one end of the first transmission shaft (13) and sealed with the gear box body (1), a second volute assembly (3) installed at the other end of the first transmission shaft (13) and sealed with the gear box body (1), a third volute assembly (4) installed at one end of the second transmission shaft and sealed with the gear box body (1), a fourth volute assembly (5) installed at the other end of the second transmission shaft and sealed with the gear box body (12), a first volute assembly (6) installed at the outer end part of the first assembly (2), the second volute assembly (1) and the second volute assembly (1) are located at two sides of the first volute assembly (1) and the second volute assembly (1) are located at the two sides of the input shaft (1 respectively, the second volute assembly (3) and the fourth volute assembly (5) are positioned on the same side of the gear box body (1); the guide vane opening adjusting assembly (6) comprises an air inlet adjusting guide shell mechanism (61) and a reducer pipe (62) arranged between the air inlet adjusting guide shell mechanism (61) and the first volute assembly (2); the method is characterized in that:

the air inlet adjusting guide shell mechanism (61) comprises a guide shell (611), a plurality of groups of inlet guide vane units (613) which are adjustably arranged on the guide shell (611) and extend into the guide shell to be matched with each other, and a driving rod (614) connected with any group of inlet guide vane units (613) to drive the inlet guide vane units to rotate,

each group of inlet guide vane units (613) comprises an inlet guide vane rod assembly (6132) which rotatably penetrates through the guide shell (611), a shifting fork piece (6133) sleeved at the outer end part of the inlet guide vane rod assembly (6132), a transmission ring body (6135) which is rotatably sleeved on the guide shell (611) through a plurality of rollers (6134) installed on the side surface, and a shifting fork connecting rod (6136) which is formed on the outer circumferential surface of the transmission ring body (6135) and matched with the shifting fork piece (6133), wherein the driving rod (614) is connected with any shifting fork piece (6133), and the inlet guide vane rod assembly (6132) comprises an inlet guide vane (61321) arranged in the guide shell (611) and a vane shaft (61322) with one end connected with the inlet guide vane (61321) and penetrating through the guide shell (611) to be connected with the shifting fork piece (6133);

the first volute assembly (2) comprises a first volute (21), a guide body (22) which is arranged on the end face of the first volute (21) and connected with the reducer pipe (62), an impeller (23) which is arranged at one end of the first transmission shaft (13) and positioned between the first volute (21) and the guide body (22), a diffuser (27) which is arranged between the first volute (21) and the guide body (22) and positioned at the outer ring of the impeller (23), and an air sealing structure (26) which is arranged between the first transmission shaft (13) and the first volute (21) and positioned at the inner side of the impeller (23);

the gearbox casing (1) comprises a gearbox casing (10) penetrated by the first transmission shaft (13), an oil seal structure (14) arranged between the gearbox casing (10) and the first transmission shaft (13) and adjacent to the air seal structure (26), a multi-split bearing pad (16) sleeved on the first transmission shaft (13) and positioned on the inner side of the oil seal structure (14), and a bearing (15) arranged between the multi-split bearing pad (16) and the gearbox casing (10).

2. The centrifugal compressor according to claim 1, wherein: the air inlet adjusting guide shell mechanism (61) also comprises an outer ring supporting sealing unit (612) which is arranged on the peripheral surface of the guide shell (611) and surrounds a closed cavity (6114) with the guide shell,

the flow guiding shell (611) comprises a hollow pipe body (6111), a first installation end plate (6112) formed at one end of the hollow pipe body (6111) and a second installation end plate (6113) formed at the other end of the hollow pipe body (6111);

the outer ring support sealing unit (612) comprises a sealing ring body (6121) arranged on the outer side of the hollow pipe body (6111), a third mounting end plate (6123) formed at one end of the sealing ring body (6121) and mounted on the surface of the first mounting end plate (6112), a fourth mounting end plate (6122) formed at the other end of the sealing ring body (6121) and mounted on the peripheral surface of the second mounting end plate (6113), a limiting seat (6125) arranged on the peripheral surface of the sealing ring body (6121), a support transverse plate (6127) respectively supported on the third mounting end plate (6123) and the fourth mounting end plate (6122) through a supporting plate (6126), and an avoidance hole (6128) formed on the support transverse plate (6127), and the driving rod (614) is rotatably mounted in the limiting seat (6125).

3. The centrifugal compressor according to claim 2, wherein: a first annular groove (6116) is formed in the outer peripheral surface of the second installation end plate (6113), and a first sealing ring is arranged in the first annular groove (6116); a second annular groove (6124) is formed in the outer surfaces of the third mounting end plate (6123) and the fourth mounting end plate (6122) independently, and a second sealing ring is arranged in the second annular groove (6124);

a limiting ring groove (6117) is formed in the outer peripheral surface of the hollow pipe body (6111), and a plurality of rollers (6134) are rotatably arranged in the limiting ring groove (6117);

the hollow pipe body (6111) is provided with a plurality of blade shaft seats (6115) corresponding to the blade shafts (61322) one by one on the outer peripheral surface, the blade shafts (61322) are rotatably installed in the blade shaft seats (6115), and the transmission ring body (6135) is positioned between the plurality of blade shaft seats (6115) and the limiting ring groove (6117).

4. A centrifugal compressor according to claim 3, wherein: each blade shaft (61322) is rotatably mounted in each blade shaft seat (6115) through a self-lubricating bearing (6131),

a third annular groove (61311) is formed in the outer peripheral surface of the self-lubricating bearing (6131), and a third sealing ring is arranged in the third annular groove (61311);

a fourth annular groove (61323) and a fifth annular groove (61324) positioned on the outer ring of the fourth annular groove (61323) are formed in the outer peripheral surface of each blade shaft (61322), and fourth sealing rings are arranged in the fourth annular groove (61323) and the fifth annular groove (61324) independently of each other;

the shifting fork piece (6133) is connected with the driving rod (614) through a connecting key (61331), and the shifting fork connecting rod (6136) is movably connected with the shifting fork piece (6133) through a connecting shaft (61361) on the shifting fork connecting rod;

a sixth annular groove (6141) and a seventh annular groove (6142) positioned on the outer ring of the sixth annular groove (6141) are formed in the outer peripheral surface of the driving rod (614), and fifth sealing rings are arranged in the sixth annular groove (6141) and the seventh annular groove (6142) independently of each other.

5. The centrifugal compressor according to claim 2, wherein: the reducer pipe (62) comprises a first flange ring body (621) arranged on the outer end face of the fourth mounting end plate (6122), a second flange ring body (622) arranged on the outer end face of the guide body (22) and an air inlet guide shell (623) connected with the first flange ring body (621) and the second flange ring body (622), the diameter of the air inlet guide shell (623) is gradually reduced in the direction from the first flange ring body (621) to the second flange ring body (622), and the inner wall of the air inlet guide shell (623) is provided with a first annular surface (6231) at the joint with the first flange ring body (621) and a second annular surface (6232) at the joint with the second flange ring body (622).

6. The centrifugal compressor according to claim 1, wherein: an eighth annular groove (24) is formed in the inner side surface of the flow guide body (22), a ninth annular groove (25) is formed in the end surface of the flow guide body, sixth sealing rings are arranged in the eighth annular groove (24) and the ninth annular groove (25) independently of each other, and the eighth annular groove (24) and the ninth annular groove (25) are shielded and sealed by the surface of the first volute (21); a plurality of air seal balance air holes (261) are formed in the air seal structure (26), two tenth annular grooves (28) positioned on two sides of the air seal balance air holes (261) are formed in the outer peripheral surface of the air seal structure (26), and a seventh sealing ring is arranged in each tenth annular groove (28).

7. The centrifugal compressor according to claim 1 or 6, wherein: a convex ring body (210) is formed on the end face, opposite to the gear box body (1), of the first volute (21), a concave ring groove (101) matched with the convex ring body (210) is formed on the end face, opposite to the first volute (21), of the gear box housing (10), an eleventh ring groove (211) is formed on the peripheral surface of the convex ring body (210), and an eighth sealing ring is arranged in the eleventh ring groove (211).

8. The centrifugal compressor according to claim 2, wherein: the outer ring support sealing unit (612) is further provided with a protective gas charging hole (601) and a protective gas discharging hole (602) which are communicated with the closed cavity (6114), the protective gas charging hole (601) is provided with a pressure sensor, the protective gas discharging hole (602) is connected with a gas recovery container through a first gas pipe, the gear box shell (10) is provided with a leakage-proof gas hole, and the leakage-proof gas hole is connected with the gas recovery container through a second gas pipe.

9. The centrifugal compressor according to claim 1 or 6, wherein: impeller (23) are including impeller body (231) that shaft hole (232) was seted up at the center and equidistant formation impeller body (231) are on the surface and multiunit blade group (233) that the spiral extends, impeller body (231) are in through shaft hole (232) suit first transmission shaft (13)'s tip, every group blade group (233) are including interval setting and area taper's first blade (2331), second blade (2332) and third blade (2333), first blade (2331) second blade (2332) with the inner tip of third blade (2333) aligns and outer tip is not aligned.

10. The centrifugal compressor according to claim 1, wherein: each valve is provided with a plurality of pattern grooves (161) and an oil bearing hole (162) which are arranged at intervals on the outer surface of the bearing pad (16), limit stops (163) are arranged on two sides of the bearing pad (16), a plurality of oil inlet holes (151) corresponding to the oil bearing hole (162) are formed in the bearing (15), and oil nozzles with the section size reduced inwards are arranged in the oil inlet holes (151).