High-efficient compressor arrangement of inert gas mixture bearing
阅读说明：本技术 一种惰性混合气体轴承高效压缩装置 (High-efficient compressor arrangement of inert gas mixture bearing ) 是由 马同玲 张希 杨鑫 郑振江 秦勇 肖阳 于 2020-04-30 设计创作，主要内容包括：本发明属于压缩装置技术领域,具体涉及一种惰性混合气体轴承高效压缩装置,其应用于使用惰性混合工质的闭式循环发电系统中。其包括：芯轴螺母、压气机蜗壳、离心叶轮、扩压器、弹性垫圈、六角头螺栓、垫片、压力盘、前止推轴承、止推轴承定位环、后止推轴承、主轴、弹性挡圈、波形垫圈、前径向轴承、径向轴承定位环、中介机匣、后径向轴承、芯轴；与现有技术相比较,本发明的惰性混合气体轴承高效压缩装置,使用惰性混合气体轴承,且实现压缩的工质是惰性混合气体。其经过实验,可使一定流量惰性混合气体流量1.2Kg/s,压缩装置压比2.5,绝热效率>80％。(The invention belongs to the technical field of compression devices, and particularly relates to an inert mixed gas bearing efficient compression device which is applied to a closed cycle power generation system using an inert mixed working medium. It includes: the centrifugal compressor comprises a mandrel nut, a compressor volute, a centrifugal impeller, a diffuser, an elastic washer, a hexagon head bolt, a gasket, a pressure disc, a front thrust bearing, a thrust bearing positioning ring, a rear thrust bearing, a main shaft, an elastic retainer ring, a wave washer, a front radial bearing, a radial bearing positioning ring, an intermediate casing, a rear radial bearing and a mandrel; compared with the prior art, the inert mixed gas bearing efficient compression device uses the inert mixed gas bearing, and the working medium for realizing compression is the inert mixed gas. Through experiments, the flow of inert mixed gas with a certain flow can be 1.2Kg/s, the pressure ratio of a compression device is 2.5, and the heat insulation efficiency is more than 80%.)
1. An efficient compressor for inert gas mixture bearings, comprising: the centrifugal compressor comprises a mandrel nut (1), a compressor volute (2), a centrifugal impeller (3), a diffuser (4), an elastic washer (5), a hexagon head bolt (6), a gasket (7), a pressure disc (8), a front thrust bearing (9), a thrust bearing positioning ring (10), a rear thrust bearing (11), a main shaft (12), an elastic check ring (13), a wave-shaped washer (14), a front radial bearing (15), a radial bearing positioning ring (16), an intermediate casing (17), a rear radial bearing (18) and a mandrel (19);
a through hole is formed in the center of the centrifugal impeller (3), the mandrel (19) penetrates out of the through hole, and the centrifugal impeller (3) is connected with the mandrel (19) through the mandrel nut (1);
the main shaft (12) is inserted from the right end of the centrifugal impeller (3) and is in interference fit with the outer circle of the right end of the centrifugal impeller (3), so that a rigid rotor is formed;
the front radial bearing (15), the radial bearing positioning ring (16) and the rear radial bearing (18) are sequentially matched and arranged on the intermediate casing (17) along the axial direction;
the left end of an inner hole of the intermediate casing (17) is provided with a groove for arranging an elastic check ring (13) to play a role in axial positioning, the right end of the elastic check ring (13) is matched with a wave-shaped gasket (14), the wave-shaped gasket (14) provides pressing force to exert the action on a front radial bearing (15), a radial bearing positioning ring (16) and a rear radial bearing (18) on the right side of the wave-shaped gasket (14), so that the front radial bearing (15), the radial bearing positioning ring (16) and the rear radial bearing (18) are pressed against the intermediate casing (17);
a thrust bearing positioning ring (10) is arranged at the left end of the inner side of the intermediate casing (17), a front thrust bearing (9) and a rear thrust bearing (11) are respectively arranged at the left side and the right side of the thrust bearing positioning ring (10), the rear thrust bearing (11) is positioned between the thrust bearing positioning ring (10) and the intermediate casing (17), a pressure disc (8) is arranged at the left side of the front thrust bearing (9), the left side of the pressure disc (8) is the right end surface of the inner side of the diffuser (4), and an elastic gasket (5) is arranged at the end surface combination part of the pressure disc (8) and the right end surface of the inner; the right end face of the outer side of the diffuser (4) is arranged at the left end of the outer side of the intermediary casing (17), namely, the excircle of the right end of the diffuser (4) is inserted into the inner hole of the left end of the outer side of the intermediary casing (17);
the excircle at the left end of the diffuser (4) is inserted into the inner hole at the right end of the compressor volute (2) to realize positioning; the excircle of diffuser (4) right-hand member is installed at intermediary machine casket (17) outside left end through hexagon head bolt (6) and gasket (7), and through the tang centering, make elastic washer (5) warp, elastic washer (5) produce the top tight power of two directions about towards, make to seal closely between diffuser (4) and compressor spiral case (2) towards left top tight power, make pressure disc (8), preceding footstep bearing (9), footstep bearing holding ring (10), back footstep bearing (11) compress tightly with intermediary machine casket (17) towards the top tight power on right side.
The diffuser (4), the intermediate casing (17), the elastic washer (5), the pressure disc (8), the elastic retainer ring (13), the wave washer (14), the thrust bearing positioning ring (10) and the radial bearing positioning ring (16) form a bearing supporting system;
the centrifugal impeller (3) is driven to rotate by the main shaft (12), radial force is transmitted to the bearing support system through the front radial bearing (15) and the rear radial bearing (18), and axial force is transmitted to the bearing support system through the front thrust bearing (9) and the rear thrust bearing (11).
2. The inert gas mixture bearing high efficiency compressor device as claimed in claim 1, wherein said centrifugal impeller (3) has 12 blades, which are uniformly distributed in the circumferential direction and have a straight-grained surface profile.
3. The inert mixed gas bearing high-efficiency compression device as claimed in claim 1, wherein a certain clearance is left between the inner wall surface of the compressor volute (2) and the blade top profile of the centrifugal impeller (3), and the clearance value ranges from 0.35mm to 0.45 mm.
4. An inert mixed gas bearing high efficiency compression device as claimed in claim 1 wherein said diffuser (4) is a vaneless diffuser.
5. The inert gas mixture bearing high efficiency compressor assembly as claimed in claim 1, wherein the corresponding positions on the front radial bearing (15), the radial bearing retainer ring (16) and the rear radial bearing (18) are grooved respectively, and are circumferentially positioned with the intermediate casing (17) by pins.
6. The inert gas mixture bearing high-efficiency compression device as claimed in claim 1, wherein the thrust bearing positioning ring (10), the intermediate casing (17) and the pressure disk (8) are provided with through holes, blind holes and blind holes at the same circumferential and radial positions on the left end face and the right end face, respectively; the bolt is arranged in the through hole of the thrust bearing positioning ring (10), the front thrust bearing (9) and the rear thrust bearing (11) are respectively arranged on the left side and the right side of the thrust bearing positioning ring through the bolt, the bolt is arranged on the left side end face of the intermediate case (17), the pressure disc (8) is arranged on the left side of the thrust bearing positioning ring (10), and the bolt is used for realizing the centering of the pressure disc (8), the thrust bearing positioning ring (10) and the intermediate case (17).
7. The inert gas mixture bearing high efficiency compressor assembly as recited in claim 1, wherein the gas bearing used in the inert gas mixture bearing high efficiency compressor assembly is an inert gas mixture bearing.
8. The inert gas mixture bearing high efficiency compressor device as claimed in claim 1, wherein the working medium compressed by the inert gas mixture bearing high efficiency compressor device is inert gas mixture.
9. The inert mixed gas bearing high-efficiency compression device as claimed in claim 1, wherein the centrifugal impeller (3), the diffuser (4) and the compressor volute (2) jointly form a gas flow channel.
10. The inert gas mixture bearing high efficiency compressor assembly as claimed in claim 9 wherein definition D3Is the diameter of the outlet of the diffuser (4), D2Is the outlet diameter of the centrifugal impeller (3), D1tIs the diameter of the rim of the centrifugal impeller (3), D1hIs the diameter of the inlet hub of the centrifugal impeller (3), b2Is the outlet width of the centrifugal impeller (3), and L is the axial length of the centrifugal impeller (3);
wherein the content of the first and second substances,the setting range is 1.4-1.7;
the setting range is 0.5-0.8;
the setting range is 0.2-0.4;
the setting range is 0.035-0.085.
L is set to range from 24mm to 26 mm.
Technical Field
The invention belongs to the technical field of compression devices, and particularly relates to an inert mixed gas bearing efficient compression device which is applied to a closed cycle power generation system using an inert mixed working medium.
Background
The compression device converts mechanical work into kinetic energy and pressure potential energy of gas, thereby obtaining high-pressure gas. The compressor unit generally comprises a compressor rotor, a diffuser or a volute, a bearing support system, a bearing lubrication system, a sealing element and the like. The compressor rotor utilizes the blades rotating at high speed to do work on the gas so as to improve the pressure of the gas, and the high-pressure gas enters a diffuser or a volute to continue to decelerate and increase the pressure so as to obtain relatively high-pressure gas, thereby completing energy conversion. The bearing support system provides radial support for the rotor and takes up axial forces of the rotor. The bearing lubricating system provides lubrication for the bearing, takes away heat generated by the rotating friction of the bearing, and ensures the reliable and safe operation of the rotor. The bearings are generally oil-lubricated bearings such as floating bearings or rolling bearings, and gas bearings are also used.
Working media of the existing compression device are generally air, fuel gas, carbon dioxide and the like, and when inert mixed gas is directly used, certain flow separation exists in a blade airflow channel, a diffuser and a volute of a rotor, energy loss is generated, and therefore energy conversion efficiency is low.
Disclosure of Invention
Technical problem to be solved
The technical problem to be solved by the invention is as follows: how to provide an inert mixed gas bearing high-efficiency compression device.
(II) technical scheme
In order to solve the above technical problem, the present invention provides an inert mixed gas bearing high efficiency compression device, which comprises: the centrifugal compressor comprises a mandrel nut 1, a compressor volute 2, a centrifugal impeller 3, a diffuser 4, an elastic washer 5, a hexagon head bolt 6, a gasket 7, a pressure disc 8, a front thrust bearing 9, a thrust bearing positioning ring 10, a rear thrust bearing 11, a main shaft 12, an elastic retainer ring 13, a wave washer 14, a front radial bearing 15, a radial bearing positioning ring 16, an intermediate casing 17, a rear radial bearing 18 and a mandrel 19;
a through hole is formed in the center of the centrifugal impeller 3, the mandrel 19 penetrates out of the through hole, and the centrifugal impeller 3 is connected with the mandrel 19 through the mandrel nut 1;
the main shaft 12 is inserted from the right end of the centrifugal impeller 3 and is in interference fit with the outer circle of the right end of the centrifugal impeller 3, so that a rigid rotor is formed;
the front radial bearing 15, the radial bearing positioning ring 16 and the rear radial bearing 18 are sequentially matched and arranged on the intermediate casing 17 along the axial direction;
the left end of an inner hole of the intermediary case 17 is provided with a groove for arranging an elastic retainer ring 13 to play a role in axial positioning, the right end of the elastic retainer ring 13 is matched with the wave-shaped gasket 14, the wave-shaped gasket 14 provides a pressing force to act on a front radial bearing 15, a radial bearing positioning ring 16 and a rear radial bearing 18 on the right side of the wave-shaped gasket 14, so that the front radial bearing 15, the radial bearing positioning ring 16 and the rear radial bearing 18 are pressed with the intermediary case 17;
a thrust bearing positioning ring 10 is arranged at the left end of the inner side of the intermediate casing 17, a front thrust bearing 9 and a rear thrust bearing 11 are respectively arranged at the left side and the right side of the thrust bearing positioning ring 10, the rear thrust bearing 11 is positioned between the thrust bearing positioning ring 10 and the intermediate casing 17, a pressure disc 8 is arranged at the left side of the front thrust bearing 9, the left side of the pressure disc 8 is the right end surface of the inner side of the diffuser 4, and an elastic gasket 5 is arranged at the joint part of the pressure disc 8 and the end surface of the right end surface of the inner; the right end surface of the outer side of the diffuser 4 is arranged at the left end of the outer side of the intermediary casing 17, namely, the excircle of the right end of the diffuser 4 is inserted into the inner hole of the left end of the outer side of the intermediary casing 17;
the outer circle of the left end of the diffuser 4 is inserted into the inner hole of the right end of the compressor volute 2 to realize positioning; the excircle of diffuser 4 right-hand member is installed at intermediary machine casket 17 outside left end through hexagon head bolt 6 and gasket 7, and through tang centering, messenger's elastic washer 5 warp, and elastic washer 5 produces the tight power of top towards two directions about, makes to seal closely between diffuser 4 and the compressor spiral case 2 towards left tight power of top, and the tight power of top towards the right side makes pressure disc 8, preceding thrust bearing 9, thrust bearing holding ring 10, back thrust bearing 11 compress tightly with intermediary machine casket 17.
The diffuser 4, the intermediate casing 17, the elastic washer 5, the pressure disc 8, the elastic retainer ring 13, the wave washer 14, the thrust bearing positioning ring 10 and the radial bearing positioning ring 16 form a bearing supporting system;
the centrifugal impeller 3 is rotated by the main shaft 12, the radial force is transmitted to the bearing support system through the front radial bearing 15 and the rear radial bearing 18, and the axial force is transmitted to the bearing support system through the front thrust bearing 9 and the rear thrust bearing 11.
The centrifugal impeller 3 comprises 12 blades which are uniformly distributed in the circumferential direction, and the molded surface is a ruled surface.
A certain gap is reserved between the inner wall surface of the compressor volute 2 and the blade top molded surface of the centrifugal impeller 3, and the gap value range is 0.35 mm-0.45 mm.
Wherein, the diffuser 4 is a vaneless diffuser.
The corresponding positions of the front radial bearing 15, the radial bearing positioning ring 16 and the rear radial bearing 18 are respectively grooved, and the circumferential positioning with the intermediate casing 17 is realized through pins.
Wherein, the thrust bearing positioning ring 10, the intermediate casing 17 left side end face and the pressure disc 8 right side end face are provided with a through hole, a blind hole and a blind hole in the same circumferential and radial positions respectively; the pin is arranged in the through hole of the thrust bearing positioning ring 10, the front thrust bearing 9 and the rear thrust bearing 11 are respectively arranged on the left side and the right side of the thrust bearing positioning ring through the pin, the pin is arranged on the left end face of the intermediate casing 17, the pressure disc 8 is arranged on the left side of the thrust bearing positioning ring 10 through the pin, and the centering of the pressure disc 8, the thrust bearing positioning ring 10 and the intermediate casing 17 is realized through the pin.
The gas bearing used by the inert mixed gas bearing high-efficiency compression device is an inert mixed gas bearing.
The working medium compressed by the inert mixed gas bearing high-efficiency compression device is inert mixed gas.
The centrifugal impeller 3, the diffuser 4 and the compressor volute 2 jointly form an air flow channel.
Wherein, D is defined3Is the diameter of the outlet of the diffuser 4, D2Is the diameter of the outlet of the centrifugal impeller 3, D1tIs the diameter of the rim of the centrifugal impeller 3, D1hIs the diameter of the inlet hub of the centrifugal impeller 3, b2Is the outlet width of the centrifugal impeller 3, and L is the axial length of the centrifugal impeller 3;
wherein the content of the first and second substances,the setting range is 1.4-1.7;
the setting range is 0.5-0.8;
the setting range is 0.2-0.4;
the setting range is 0.035-0.085.
L is set to range from 24mm to 26 mm.
(III) advantageous effects
Compared with the prior art, the inert mixed gas bearing efficient compression device uses the inert mixed gas bearing, and the working medium for realizing compression is the inert mixed gas. Through experiments, the flow of inert mixed gas with a certain flow can be 1.2Kg/s, the pressure ratio of a compression device is 2.5, and the heat insulation efficiency is more than 80%.
Drawings
Fig. 1 is a schematic structural diagram of the technical solution of the present invention.
Fig. 2 is a schematic view of a flow channel according to the technical solution of the present invention.
Detailed Description
In order to make the objects, contents, and advantages of the present invention clearer, the following detailed description of embodiments of the present invention will be made in conjunction with the accompanying drawings and examples.
The invention provides an inert mixed gas bearing high-efficiency compression device, which is characterized in that a blade aerodynamic profile, an airflow channel and a volute of a compressor rotor are designed according to the working medium characteristics of inert mixed gas, and high-pressure gas is obtained through the structural design of a rotor system, the volute, a gas bearing and a supporting system and the design of an air system, so that the energy conversion of the inert mixed gas is realized.
Specifically, the inert gas mixture bearing high-efficiency compression device provided by the invention, as shown in fig. 1, comprises: the centrifugal compressor comprises a mandrel nut 1, a compressor volute 2, a centrifugal impeller 3, a diffuser 4, an elastic washer 5, a hexagon head bolt 6, a gasket 7, a pressure disc 8, a front thrust bearing 9, a thrust bearing positioning ring 10, a rear thrust bearing 11, a main shaft 12, an elastic retainer ring 13, a corrugated washer 14, a front radial bearing 15, a radial bearing positioning ring 16, an intermediate casing 17, a rear radial bearing 18 and a mandrel 19;
a through hole is formed in the center of the centrifugal impeller 3, the mandrel 19 penetrates out of the through hole, and the centrifugal impeller 3 is connected with the mandrel 19 through the mandrel nut 1;
the main shaft 12 is inserted from the right end of the centrifugal impeller 3 and is in interference fit with the outer circle of the right end of the centrifugal impeller 3, so that a rigid rotor is formed;
the front radial bearing 15, the radial bearing positioning ring 16 and the rear radial bearing 18 are sequentially matched and arranged on the intermediate casing 17 along the axial direction;
the left end of an inner hole of the intermediary case 17 is provided with a groove for arranging an elastic retainer ring 13 to play a role in axial positioning, the right end of the elastic retainer ring 13 is matched with the wave-shaped gasket 14, the wave-shaped gasket 14 provides a pressing force to act on a front radial bearing 15, a radial bearing positioning ring 16 and a rear radial bearing 18 on the right side of the wave-shaped gasket 14, so that the front radial bearing 15, the radial bearing positioning ring 16 and the rear radial bearing 18 are pressed with the intermediary case 17;
a thrust bearing positioning ring 10 is arranged at the left end of the inner side of the intermediate casing 17, a front thrust bearing 9 and a rear thrust bearing 11 are respectively arranged at the left side and the right side of the thrust bearing positioning ring 10, the rear thrust bearing 11 is positioned between the thrust bearing positioning ring 10 and the intermediate casing 17, a pressure disc 8 is arranged at the left side of the front thrust bearing 9, the left side of the pressure disc 8 is the right end surface of the inner side of the diffuser 4, and an elastic gasket 5 is arranged at the joint part of the pressure disc 8 and the end surface of the right end surface of the inner; the right end surface of the outer side of the diffuser 4 is arranged at the left end of the outer side of the intermediary casing 17, namely, the excircle of the right end of the diffuser 4 is inserted into the inner hole of the left end of the outer side of the intermediary casing 17;
the outer circle of the left end of the diffuser 4 is inserted into the inner hole of the right end of the compressor volute 2 to realize positioning; the excircle of diffuser 4 right-hand member is installed at intermediary machine casket 17 outside left end through hexagon head bolt 6 and gasket 7, and through tang centering, messenger's elastic washer 5 warp, and elastic washer 5 produces the tight power of top towards two directions about, makes to seal closely between diffuser 4 and the compressor spiral case 2 towards left tight power of top, and the tight power of top towards the right side makes pressure disc 8, preceding thrust bearing 9, thrust bearing holding ring 10, back thrust bearing 11 compress tightly with intermediary machine casket 17.
The diffuser 4, the intermediate casing 17, the elastic washer 5, the pressure disc 8, the elastic retainer ring 13, the wave washer 14, the thrust bearing positioning ring 10 and the radial bearing positioning ring 16 form a bearing supporting system;
the centrifugal impeller 3 is rotated by the main shaft 12, the radial force is transmitted to the bearing support system through the front radial bearing 15 and the rear radial bearing 18, and the axial force is transmitted to the bearing support system through the front thrust bearing 9 and the rear thrust bearing 11.
The centrifugal impeller 3 comprises 12 blades which are uniformly distributed in the circumferential direction, and the molded surface is a ruled surface.
A certain gap is reserved between the inner wall surface of the compressor volute 2 and the blade top molded surface of the centrifugal impeller 3, and the gap value range is 0.35 mm-0.45 mm.
Wherein, the diffuser 4 is a vaneless diffuser.
The corresponding positions of the front radial bearing 15, the radial bearing positioning ring 16 and the rear radial bearing 18 are respectively grooved, and the circumferential positioning with the intermediate casing 17 is realized through pins.
Wherein, the thrust bearing positioning ring 10, the intermediate casing 17 left side end face and the pressure disc 8 right side end face are provided with a through hole, a blind hole and a blind hole in the same circumferential and radial positions respectively; the pin is arranged in the through hole of the thrust bearing positioning ring 10, the front thrust bearing 9 and the rear thrust bearing 11 are respectively arranged on the left side and the right side of the thrust bearing positioning ring through the pin, the pin is arranged on the left end face of the intermediate casing 17, the pressure disc 8 is arranged on the left side of the thrust bearing positioning ring 10 through the pin, and the centering of the pressure disc 8, the thrust bearing positioning ring 10 and the intermediate casing 17 is realized through the pin.
The gas bearing used by the inert mixed gas bearing high-efficiency compression device is an inert mixed gas bearing.
The working medium compressed by the inert mixed gas bearing high-efficiency compression device is inert mixed gas.
As shown in fig. 2, the centrifugal impeller 3, the diffuser 4, and the compressor volute 2 together form an airflow channel.
According to the invention, the flow channel profile of the compressor volute 2, the flow channel profile of the centrifugal impeller and the blade profile are designed according to the characteristics of inert mixed gas working media, as shown in figure 2, gas flow is axially fed from the left side and is subjected to rotary pressurization by the centrifugal impeller, and gas flowing out of the centrifugal impeller enters the diffuser and the compressor volute for further speed reduction and pressurization. Designing an airflow channel and a centrifugal impeller blade profile according to the physical properties of the inert mixed working medium;
definition D3Is the diameter of the outlet of the diffuser 4, D2Is the diameter of the outlet of the centrifugal impeller 3, D1tIs the diameter of the rim of the centrifugal impeller 3, D1hIs the diameter of the inlet hub of the centrifugal impeller 3, b2Is the width of the outlet of the centrifugal impeller 3, and L is the axial length of the centrifugal impeller 3;
wherein the content of the first and second substances,the setting range is 1.4-1.7, and the preferred scheme is 1.5;
the setting range is 0.5-0.8, and the preferred scheme is 0.6;
the setting range is 0.2-0.4, and the preferable scheme is 0.36;
the setting range is 0.035-0.085, and the preferable scheme is 0.039.
L is set to be in the range of 24 mm-26 mm, and 25mm is selected in the preferable scheme. The flow channel profile curve is generated through spline points, and the setting realizes that the flow of the gas compressor is 1.2Kg/s, the whole-stage pressure ratio is 2.5, and the heat insulation efficiency is more than 80%. The flow channel and profile data are shown in the appendix.
The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, several modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.
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