CN113374729A - Circulating machine - Google Patents

Abstract

The utility model provides a circulator, which comprises a shaft, a turbine part, a gas compressor part, a fan part, a thrust structure and a balance piece, wherein the turbine part, the gas compressor part and the fan part share the shaft; the thrust structure is arranged at a position between the turbine part and the compressor part, the balance piece is arranged at a position between the fan part and the compressor part, the side of the balance piece facing the fan part can introduce gas to form pressure P1, and the side of the balance piece facing the compressor part can introduce gas to form pressure P2, wherein P2 is not equal to P1. According to the pneumatic bearing, the axial pneumatic load of a rotor system can be reduced, the bearing capacity of the thrust bearing is reduced, the structure of the pneumatic thrust bearing is easy to realize, the reliability of the pneumatic bearing is improved, the realization difficulty of the pneumatic thrust bearing is reduced, and the reliability design of the pneumatic bearing is facilitated.

Description

Circulating machine

Technical Field

The present disclosure relates to the technical field of air cycle machines, and particularly to a cycle machine.

Background

The system adopts a compressed air circulation refrigeration system with air as a working medium, adopts a turbine compressor and an expander to respectively realize the compression and expansion processes, and simultaneously needs a fan to realize convection heat exchange. The gas expansion outputs work, and the gas compression and the fan supply need to consume work, so that the aim of saving energy can be fulfilled if the gas expansion work is used for the gas compression and the fan supply.

The rotor system assembly of the air cycle machine for compressed air refrigerating system consists of expansion impeller, compression impeller, fan blade, etc. The rotor system is axially supported by a pair of thrust pneumatic bearings. The axial unbalanced aerodynamic force among the expansion impeller, the compression impeller and the fan blade needs to be distributed on the thrust aerodynamic bearing. Thereby realizing that the thrust pneumatic bearing force offsets the axial pneumatic force of the rotor system.

Because the air cycle machine in the prior art has the technical problems that the axial pneumatic load is large, the bearing capacity of a thrust bearing is overlarge, the reliability of the bearing is influenced, and the like, the air cycle machine is researched and designed according to the disclosure.

BRIEF SUMMARY OF THE PRESENT DISCLOSURE

Therefore, the technical problem to be solved by the present disclosure is to overcome the defect that the air cycle machine in the prior art has large axial pneumatic load, which causes the bearing capacity of the thrust bearing to be too large, and affects the pneumatic axial force of the reliability of the bearing, thereby providing a cycle machine.

In order to solve the above problems, the present disclosure provides a cycle machine, including a shaft, a turbine part, a compressor part, a fan part, a thrust structure, and a balance member, where the turbine part, the compressor part, and the fan part share the shaft, and the thrust structure and the balance member are both sleeved on the shaft;

the thrust structure is arranged at a position between the turbine portion and the compressor portion, the balance piece is arranged at a position between the fan portion and the compressor portion, a side of the balance piece facing the fan portion can introduce gas to form a pressure P1, and a side of the balance piece facing the compressor portion can introduce gas to form a pressure P2, P2 ≠ P1.

In some embodiments, a side of the balance being towards the fan portion is capable of introducing gas in the fan portion to form a pressure P1, a side of the balance being towards the compressor portion is capable of introducing gas in the turbine portion to form a pressure P2, and P2> P1.

In some embodiments, the turbine portion includes an expansion casing having an expansion chamber therein, the cycle machine further includes a communication passage formed on a side of the balance toward the compressor portion to generate a pressure P2 to the balance, and a first chamber, the communication passage having one end capable of introducing gas from the expansion chamber and the other end capable of introducing it into the first chamber.

In some embodiments, the communicating channel includes a first air path, a connecting pipeline and a second air path, the first air path is disposed on the expansion shell and communicated with the expansion chamber, the blower part further includes a blower base, the second air path is disposed on the blower base, the connecting pipeline is located outside the expansion shell and the blower base, one end of the connecting pipeline can be communicated with the first air path to introduce gas from the first air path, the other end of the connecting pipeline can be communicated with the second air path to convey gas to the second air path, and the other end of the second air path is communicated with the first chamber.

In some embodiments, the circulator further includes a first connector fixedly connected to the expansion housing, and a second connector fixedly connected to the blower base, one end of the connection pipe being fixed to the first connector, and the other end of the connection pipe being fixedly connected to the second connector.

In some embodiments, the compressor further comprises a radial bearing, the radial bearing is arranged on one side of the balancing piece facing the compressor part, and the first cavity is sandwiched between the radial bearing and the balancing piece.

In some embodiments, the radial journal is sleeved on the radial inner periphery of the radial bearing, one axial end of the radial journal is abutted with the balancing piece, and the total axial pneumatic force acting on the balancing piece is F4 ═ pi (d)₁ ²-d₂ ²) (P2-P1)/4, wherein d₁Is the outer diameter of the balance member, d₂Is the outer diameter of said radial journal and has d₁/d₂The value range of (A) is 1.27-1.72.

In some embodiments, the circulator further comprises a second chamber formed on a side of the balance piece facing the fan portion to generate a pressure P1 on the balance piece, the fan portion comprises a fan blade, and the second chamber is sandwiched between the fan blade and the balance piece.

In some embodiments, the radially outer periphery of the balance is further provided with a dynamic seal.

In some embodiments, the thrust structure includes a first thrust bearing, a second thrust bearing, and a thrust portion, the first thrust bearing being located on one axial side of the thrust portion, the second thrust bearing being located on the other axial side of the thrust portion, the thrust portion being capable of contacting the first thrust bearing to cancel an axial force in a first axial direction by the first thrust bearing, and the thrust portion being capable of contacting the second thrust bearing to cancel an axial force in a second axial direction by the second thrust bearing.

In some embodiments, the shaft includes a first shaft section and a second shaft section which are connected with each other, the first shaft section and the second shaft section have different outer diameters, a step surface is formed at the connection position of the first shaft section and the second shaft section, and the thrust portion is clamped at the position of the step surface.

In some embodiments, the fan portion includes a fan blade, the compressor portion includes a compression impeller, the turbine portion includes an expansion impeller, the resultant axial aerodynamic force acting on the fan blade is F1, the resultant axial aerodynamic force acting on the compression impeller is F2, the resultant axial aerodynamic force acting on the expansion impeller is F3, the resultant axial aerodynamic force acting on the balance member is F4, the bearing resultant forces of the first thrust bearing and the second thrust bearing acting together on the thrust portion are F5, F1, F2, F3, F4 and F5 along the direction of the axis of the shaft, and satisfy the balance relation: f1+ F3 ═ F2+ F4+ F5.

The circulator provided by the disclosure has the following beneficial effects:

1. according to the pneumatic bearing, the balance piece is arranged between the fan part and the compressor part, pressure P1 is formed by introducing pressure to one side of the balance piece facing the fan, and pressure P2 in the turbine is introduced to one side of the balance piece facing the compressor, so that pressure difference formed by P2 and P1 acts on the balance piece, axial pneumatic load of a rotor system can be reduced, namely the load acting on the pneumatic thrust bearing is reduced, the bearing capacity of the thrust bearing is reduced, the structure of the pneumatic thrust bearing is easy to realize, the reliability of the pneumatic bearing is improved, the realization difficulty of the pneumatic thrust bearing is reduced, and the reliable design of the pneumatic bearing is facilitated;

2. the first thrust bearing is clamped at the step surface of the shaft, the first thrust bearing is arranged at one axial side of the thrust part, the second thrust bearing is arranged at the other axial side of the thrust part, the first thrust bearing can be contacted with the thrust part to counteract the pneumatic axial force in the first axial direction, the second thrust bearing can be contacted with the thrust part to counteract the pneumatic axial force in the second axial direction, so that the pneumatic axial force generated by the movement of a fan, a compressor, a turbine and the like on the shaft acts on the shaft, the shaft directly transmits the pneumatic axial force to the first thrust bearing or the second thrust bearing through the thrust part, the axial unbalanced pneumatic force among the expansion impeller, the compression impeller and the fan blade is effectively distributed on the two thrust pneumatic bearings, and finally the axial pneumatic force of a rotor system is effectively counteracted through the thrust pneumatic bearing force, the problem that unbalanced pneumatic axial force still exists in the system due to the fact that axial pneumatic load of the air cycle machine cannot be effectively distributed on the thrust bearing is solved, the effect that the axial pneumatic load is effectively distributed on the thrust bearing through an independent thrust part structure is achieved, and assembly, disassembly and maintenance are easy to achieve.

Drawings

FIG. 1 is a perspective block diagram of an air cycle machine of the present disclosure;

FIG. 2 is a front internal cross-sectional view of the air cycle machine of the present disclosure;

FIG. 2a is an enlarged view of a portion A of FIG. 2;

FIG. 2B is an enlarged view of a portion B of FIG. 2;

FIG. 3 is an exploded view of a thrust feature in the air cycle machine of the present disclosure;

FIG. 4 is a dimensional relationship diagram of a shaft and a thrust block in an air cycle machine thrust feature of the present disclosure.

The reference numerals are represented as:

100. a turbine section; 200. a compressor section; 300. a fan section; 301. a second chamber; 400. a thrust structure; 01. an expansion shell; 011. an expansion chamber; 0101. a first gas path; 02. a first connecting member; 0201. a third gas path; 0202. a fourth gas path; 03. connecting a pipeline; 04. a second connecting member; 0401. a fifth gas path; 05. a fan base; 0501. a second gas path; 0502. a first chamber; 06. a dynamic seal; 07. a rotor system; 0701. a shaft; 71. a first shaft section; 72. a second shaft section; 0702. compressing the impeller; 0703. an axial positioning member; 0704. a radial journal; 0705. a thrust part; 0706. an expansion impeller; 0707. an expansion impeller positioning spacer; 0708. an expansion wheel locking bolt; 0709. a balance member; 0710. a fan blade; 0711. a fan blade positioning gasket; 0712. a fan blade locking bolt; 0713. an axis; 0714. a step surface; 0715. a radial bearing; 0801. a first thrust bearing; 0802. a second thrust bearing.

Detailed Description

As shown in fig. 1-4, the present disclosure provides a cycle machine (preferably an air cycle machine) comprising:

the shaft 0701, the turbine part 100, the compressor part 200 and the fan part 300, the thrust structure 400 and the balance piece 0709 are arranged, the turbine part 100, the compressor part 200 and the fan part 300 share the shaft 0701, and the thrust structure 400 and the balance piece 0709 are sleeved on the shaft 0701;

the thrust structure 400 is arranged at a position between the turbine portion 100 and the compressor portion 200, the balancing piece 0709 is arranged at a position between the fan portion 300 and the compressor portion 200, and a side of the balancing piece 0709 facing the fan portion 300 can introduce gas to form a pressure P1, and a side of the balancing piece 0709 facing the compressor portion 200 can introduce gas to form a pressure P2, P2 ≠ P1.

This is disclosed through the balancing piece that sets up between fan part and compressor part, utilize one side of the orientation fan of balancing piece to introduce pressure and form pressure P1, one side of the orientation air compressor machine of balancing piece introduces pressure P2, make the pressure differential that P2 and P1 formed act on the balancing piece, can reduce rotor system axial aerodynamic load, the load that acts on aerodynamic thrust bearing has been reduced promptly, thereby reduce the bearing capacity of thrust bearing, the structure of easy aerodynamic thrust bearing realizes, the reliability of pneumatic bearing is improved, the realization degree of difficulty of aerodynamic thrust bearing is reduced, do benefit to aerodynamic bearing's reliability design.

As shown in fig. 4, since the thrust bearing is disposed between the compressor and the expander, the axial force F5 of the gas acting on the thrust bearing is toward the left, so that the introduced gas pressure P2 should be greater than P1 to generate the leftward F4 and thus reduce F5; it may be changed depending on the source position of the introduced gas, etc.

In some embodiments, the side of the balancing piece 0709 facing the fan section 300 is capable of introducing gas into the fan section 300 to form a pressure P1, the side of the balancing piece 0709 facing the compressor section 200 is capable of introducing gas into the turbine section 100 to form a pressure P2, and P2> P1. The balance piece is arranged between the fan part and the compressor part, the pressure inside the fan is introduced to one side of the balance piece facing the fan to form pressure P1, the pressure P2 in the turbine is introduced to one side of the balance piece facing the compressor, pressure difference formed by P2 and P1 acts on the balance piece, axial pneumatic load of a rotor system can be reduced, namely, load acting on the pneumatic thrust bearing is reduced, bearing capacity of the thrust bearing is reduced, structure realization of the pneumatic thrust bearing is facilitated, reliability of the pneumatic bearing is improved, realization difficulty of the pneumatic thrust bearing is reduced, and reliability design of the pneumatic bearing is facilitated.

As shown in fig. 1. The rotary power of rotor system 07 is from the expansion work of gas, the gas flows into the expansion inlet T01 to do work, the temperature of the gas after work is reduced, the low temperature gas flows out from the expansion outlet T02 and is transmitted to the area needing refrigeration. The work of expansion drives the rotor system 07 to rotate, and the compression impeller on the rotor system 07 sucks gas from the compression inlet C01, and discharges the gas from the compression outlet C02 after compression. Meanwhile, the fan blades on the rotor system 07 suck air from a fan inlet F01 and discharge the air from a fan outlet F02 to drive the air.

As shown in fig. 2. The rotor system 07 is supported axially by a pair of thrust pneumatic bearings (including a first thrust bearing 0801 and a second thrust bearing 0802). The thrust pneumatic bearing offsets the axial unbalanced pneumatic force among the expansion impeller, the compression impeller and the fan blade.

In some embodiments, the turbine portion 100 comprises an expansion casing 01 having an expansion chamber 011 inside, the cycle machine further comprising a communication channel and a first chamber 0502, the first chamber 0502 being formed on the side of the balancing member 0709 facing the compressor portion 200 to generate a pressure P2 on the balancing member 0709, the communication channel being able to introduce gas from the expansion chamber 011 at one end and to introduce it into the first chamber 0502 at the other end. This is a preferable configuration of the circulator of the present disclosure, and by providing the communication passage and the first chamber opened at the side of the balance member facing the compressor section, it is possible to efficiently introduce the gas from the expansion chamber through the communication passage into the first chamber, thereby generating the pressure P2 acting on the balance member. The pressure in the expansion chamber is greater than the pressure in the fan section, which is typically in the outer space (e.g., outside the fan), which is at a relatively low pressure and decreases further as the height increases.

In some embodiments, the communication channel includes a first air path 0101, a connection pipeline 03 and a second air path 0501, the first air path 0101 is disposed on the expansion shell 01 and communicated with the expansion chamber 011, the blower portion 300 further includes a blower base 05, the second air path 0501 is disposed on the blower base 05, the connection pipeline 03 is located outside the expansion shell 01 and the blower base 05, one end of the connection pipeline 03 can be communicated with the first air path 0101 to introduce gas from the first air path 0101, the other end can be communicated with the second air path 0501 to convey gas into the second air path 0501, and the other end of the second air path 0501 is communicated with the first chamber 0502. This is the preferred structural style of the intercommunication passageway of this disclosure, including setting up the first gas circuit on expansion shell and setting up the second gas circuit on the fan is done promptly, first gas circuit is arranged in introducing inflation gas with the inflation cavity intercommunication, and the second gas circuit is arranged in leading-in first cavity of gas in the connecting line, and the connecting line produces the effect of effective connection guide gas, and the connecting line sets up the outside that can reduce inner structure's complexity in expansion shell for inner structure is more compact.

In some embodiments, the cycle machine further includes a first connector 02 and a second connector 04, the first connector 02 is fixedly connected to the expansion housing 01, the second connector 04 is fixedly connected to the blower base 05, one end of the connection pipe 03 is fixed to the first connector 02, and the other end of the connection pipe 03 is fixedly connected to the second connector 04. This is disclosed can play the effect of fixed action and intercommunication to the one end of connecting tube way effectively through the fixed first connecting piece that sets up on expansion shell, can play the effect of fixed action and intercommunication to the other end of connecting tube way effectively through the fixed second connecting piece that sets up on the fan seat.

In some embodiments, a third air channel 0201 and a fourth air channel 0202 are disposed inside the first connector 02, one end of the third air channel 0201 is communicated with the first air channel 0101, the other end of the third air channel 0201 is communicated with one end of the fourth air channel 0202, and the other end of the fourth air channel 0202 is communicated with one end of the connecting pipeline 03. This is the inside preferred structural style of this first connecting piece of disclosure, through the third gas circuit and the fourth gas circuit that its inside set up, can make gas flow into the connecting line through inflation cavity, first gas circuit, third gas circuit and fourth gas circuit in proper order, forms effectual connection effect of lining up.

In some embodiments, a fifth air channel 0401 is provided inside the second connecting part 04, and one end of the fifth air channel 0401 is communicated with the connecting pipeline 03 and the other end thereof is communicated with the second air channel 0501. This is the inside preferred structural style of second connecting piece of this disclosure, through the fifth gas circuit that its inside set up, can make gas flow in the second gas circuit of fan seat through connecting line, fifth gas circuit in proper order, further gets into in the first cavity, forms effectual connection effect of lining up.

As shown in fig. 2. At the inlet of the expansion shell 01, a first gas circuit 0101 is provided. The air paths third and fourth air paths 0201 and 0202 are arranged on the first connecting piece 02. The third air path 0201 and the fourth air path 0202 are intersected and communicated, and the third air path 0201 is in through connection with the first air path 0101. The connecting pipeline 03 and the first connecting piece 02 are welded and assembled into a whole. The fourth air passage 0202 penetrates the connecting pipeline 03. The first connector 02 is fixedly fitted to the expansion housing 01, and a sealing gasket is provided between the first connector 02 and the expansion housing 01, thereby eliminating leakage therebetween.

The second connecting piece 04 and the connecting pipeline 03 are welded and assembled into a whole. A fifth gas channel 0401 is arranged on the second connecting piece 04, and the fifth gas channel 0401 penetrates the connecting line 03. The second connector 04 is fixedly assembled on the blower base 05, and a sealing gasket is arranged between the second connector 04 and the blower base 05, so that leakage between the second connector 04 and the blower base is eliminated. A second air path 0501 is arranged on the blower base, and the second air path 0501 is communicated with the fifth air path 0401.

In some embodiments, the extending direction of the third air path 0201 is the same as the extending direction of the first air path 0101, the extending direction of the fourth air path 0202 is perpendicular to the extending direction of the third air path 0201, and the extending direction of the fourth air path 0202 is the same as the extending direction of one end of the connecting pipeline 03 connected with the fourth air path 0202. This is the preferred configuration form of third gas circuit and fourth gas circuit of this disclosure, can play the effect of buffering the air current.

In some embodiments, the extending direction of the fifth air channel 0401 is the same as the extending direction of the other end of the connecting pipeline 03 connected with the fifth air channel 0401, and the extending direction of the fifth air channel 0401 and the extending direction of the second air channel 0501 connected with the fifth air channel 0401 form a non-parallel inclined included angle. This is the preferred structural style of the fifth gas circuit of this disclosure, can play the effect of buffering the air current and play the effect that reduces the seting up length of second gas circuit.

In some embodiments, a radial bearing 0715 is further included, the radial bearing 0715 is disposed on a side of the balance 0709 facing the compressor portion 200, and the first chamber 0502 is sandwiched between the radial bearing 0715 and the balance 0709. This disclosure is through the radial bearing who sets up, except can playing the effect of radial support to the axle effectively, can also form required first cavity with between the balancing piece to introduce the gas pressure in the expansion chamber, thereby produce the pressure to the balancing piece, can balance off partial axial aerodynamic load, in order to reach the effect that reduces the axial balancing force that acts on thrust portion.

In some embodiments, the axial-aerodynamic bearing further comprises a radial journal 0704, the radial journal 0704 is sleeved on the radial inner periphery of the radial bearing 0715, one axial end of the radial journal 0704 abuts against the balance 0709, and the axial-aerodynamic resultant force acting on the balance 0709 is F4 ═ pi (d) and₁ ²-d₂ ²)*

(P2-P1)/4, wherein d₁The outer diameter of the balance 0709, d₂The outer diameter of the radial journal 0704. This is a calculation formula of the axial aerodynamic force to which the balance of the present disclosure is subjected, and the above-mentioned force F4 generated by introducing the gas can effectively balance out the shaftTo achieve a reduction in the effect of axial balancing forces acting on the thrust block.

In some embodiments, d₁/d₂The value range of (A) is 1.27-1.72. Outer diameter d of the balance 0709₁If the bearing force is too small, F4 is too small, and the resultant force F5 is large, which is not favorable for improving the reliability of the thrust bearing. And the outer diameter d of the balance 0709₁Too large, while beneficial to thrust bearing reliability, increases dynamic leakage between the dynamic seal 06 and the axial balance 0709. Thus, in order to simultaneously ensure the reliability of the thrust bearing and reduce dynamic leakage, d₁/d₂The value range of (1) is 1.27-1.72.

In some embodiments, the circulation machine further includes a second chamber 301, the second chamber 301 is formed on a side of the balance piece 0709 facing the fan portion 300 to generate a pressure P1 on the balance piece 0709, the fan portion 300 includes a fan blade 0710, and the second chamber 301 is sandwiched between the fan blade 0710 and the balance piece 0709. This is a further preferred structural form of this disclosure, through the second chamber that sets up formation with the fan blade clamp at the position of the one side of balancing piece towards fan part, can pass through the gas that the second chamber inducted in fan part, produces pressure P1.

In some embodiments, the radially outer periphery of the balance 0709 is also provided with a dynamic seal 06. This disclosure can effectively play the effect of effectively sealing up the balance member part through the dynamic seal spare that sets up at the radial periphery of balance member, prevents that the gas leakage that introduces and lead to the condition emergence that can't produce effectual pressure.

The dynamic sealing element 06 is fixedly assembled on the fan seat 05. A labyrinth seal is formed between the dynamic seal 06 and the axial balancing member 0709, so that a pressure difference is formed across the balancing member 0709, the pressures across the balancing member 0709 are P1 and P2, respectively, and usually P2> P1.

In some embodiments, the thrust structure includes a first thrust bearing 0801, a second thrust bearing 0802, and a thrust part 0705 (preferably a thrust disk), the first thrust bearing 0801 is located on one axial side of the thrust part 0705, the second thrust bearing 0802 is located on the other axial side of the thrust part 0705, the thrust part 0705 is capable of contacting with the first thrust bearing 0801 to cancel axial force in a first axial direction by the first thrust bearing 0801, and the thrust part 0705 is also capable of contacting with the second thrust bearing 0802 to cancel axial force in a second axial direction by the second thrust bearing 0802. According to the thrust bearing, the thrust part is clamped between the two thrust bearings in a structural mode, axial loads can be transmitted through the thrust disc, the first thrust bearing is used for offsetting the axial loads in the first axial direction, the second thrust bearing is used for offsetting the axial loads in the second axial direction, the axial loads can be effectively transmitted to the thrust bearings, and the effect of balancing the axial loads is improved.

In some embodiments, the shaft 0701 comprises a first shaft section 71 and a second shaft section 72 which are connected with each other, the outer diameters of the first shaft section 71 and the second shaft section 72 are different, a step surface 0714 is formed at the joint of the first shaft section and the second shaft section 72, and the thrust part 0705 is clamped at the position of the step surface 0714.

The first thrust bearing is clamped at the step surface of the shaft, the first thrust bearing is arranged at one axial side of the thrust part, the second thrust bearing is arranged at the other axial side of the thrust part, the first thrust bearing can be in contact with the thrust part to counteract the pneumatic axial force in the first axial direction, the second thrust bearing can be in contact with the thrust part to counteract the pneumatic axial force in the second axial direction, the pneumatic axial force generated by the movement of a fan, a compressor, a turbine and the like on the shaft acts on the shaft, the shaft directly transmits the pneumatic axial force to the first thrust bearing or the second thrust bearing through the thrust part, the axial unbalanced pneumatic force among the expansion impeller, the compression impeller and the fan blade is effectively distributed to the two thrust pneumatic bearings, the axial pneumatic force of a rotor system is effectively counteracted through the thrust pneumatic bearing force, and the problem that the axial pneumatic load of the air cycle machine cannot be effectively distributed to the thrust bearings to cause the system is solved The system still has the problem of unbalanced pneumatic axial force, realizes the effect that the independent thrust part structure effectively distributes axial pneumatic load to the thrust bearing, and easily realizes the assembly, disassembly and maintenance.

In some embodiments, the fan portion 300 includes a fan blade 0710, the compressor portion 200 includes a compression impeller 0702, the turbine portion 100 includes an expansion impeller 0706, an axial aerodynamic resultant force acting on the fan blade 0710 is F1, an axial aerodynamic resultant force acting on the compression impeller 0702 is F2, an axial aerodynamic resultant force acting on the expansion impeller 0706 is F3, an axial aerodynamic resultant force acting on the balance 0709 is F4, bearing resultant forces of the first thrust bearing 0801 and the second thrust bearing 0802 acting together on the thrust section 0705 are F5, F1, F2, F3, F4, and F5 are along an axis 0713 direction of the shaft 0701, and satisfy a balance relation: f1+ F3 ═ F2+ F4+ F5.

As shown in fig. 3. The rotor system 07 is assembled by a shaft 0701, a compression impeller 0702, an axial positioning piece 0703, a radial journal 0704 (namely a shaft sleeve), a thrust portion 0705 (thrust plate), an expansion impeller 0706, an expansion impeller positioning gasket 0707, an expansion wheel locking bolt 0708, a balance piece 0709, a fan blade 0710, a fan blade positioning gasket 0711 and a fan blade locking bolt 0712.

As shown in fig. 4. The axial pneumatic resultant force F1 of the fan blade 0710, the axial pneumatic resultant force F2 of the compression impeller 0702, the axial pneumatic resultant force F3 of the expansion impeller 0706, the axial pneumatic resultant force F4 of the balance 0709, and the bearing resultant force F5 provided by the two thrust bearings to the thrust part 0705. F1, F2, F3, F4 and F5 are on axis 0713 and they are only numerical values, the directions being as shown. Force balance relationship:

f1+ F3 ═ F2+ F4+ F5. The magnitudes of F1, F2 and F3 depend on the operation condition of the rotor system, when the operation condition is fixed, the values of F1, F2 and F3 are determined, F4 is increased at the moment, and the bearing resultant force F5 is reduced. The resultant force F5 of the bearing is small, the thrust bearing is easy to realize, and the reliability of the thrust bearing is easy to ensure.

Resultant axial aerodynamic force F4 ═ pi (d)₁ ²-d₂ ²) (P2-P1)/4, wherein d₁Outer diameter of the balance 0709, d₂The outer diameter of radial journal 0704. Usually increase d₁Thereby increasing F4 and decreasing the resultant bearing force F5.

Outer diameter d of the balance 0709₁Too small, the resultant bearing force F5 is large, which is detrimental to the reliability improvement of the thrust bearing. Outer diameter d of the balance 0709₁Too large, while beneficial to thrust bearing reliability, increases dynamic leakage between the dynamic seal 06 and the axial balance 0709. d₁/d₂The value range of (1) is 1.27-1.72.

The relationships of F1, F2, F3, F4, and F5 are exemplified by the above relationships. F1+ F3-F2 is 310.5N, and if the balance 0709 is not used to balance the axial aerodynamic force, i.e., F4 is 0, the thrust bearing needs to provide 310.5N of bearing force, which undoubtedly increases the difficulty in realizing the pneumatic thrust bearing. At present, a balancing piece 0709 with the outer diameter of 41mm is adopted, F4 is realized to be 258N, in this case, only a pneumatic thrust bearing capable of providing 95.2N needs to be designed, the realization difficulty of the pneumatic thrust bearing is reduced, and the reliability design of the pneumatic bearing is facilitated.

The above description is only exemplary of the present disclosure and should not be taken as limiting the disclosure, as any modification, equivalent replacement, or improvement made within the spirit and principle of the present disclosure should be included in the scope of the present disclosure. The foregoing is only a preferred embodiment of the present disclosure, 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 disclosure, and these modifications and variations should also be regarded as the protection scope of the present disclosure.

Claims (12)

1. A cycle machine characterized by: the method comprises the following steps:

the anti-thrust structure comprises a shaft (0701), a turbine part (100), a compressor part (200) and a fan part (300), a thrust structure (400) and a balance piece (0709), wherein the turbine part (100), the compressor part (200) and the fan part (300) share the shaft (0701), and the thrust structure (400) and the balance piece (0709) are sleeved on the shaft (0701);

the thrust structure (400) is arranged at a position between the turbine portion (100) and the compressor portion (200), the balancing piece (0709) is arranged at a position between the fan portion (300) and the compressor portion (200), and a side of the balancing piece (0709) facing the fan portion (300) is capable of introducing gas to form a pressure P2, and a side of the balancing piece (0709) facing the compressor portion (200) is capable of introducing gas to form a pressure P1, P1 ≠ P2.

2. The cycle machine of claim 1, wherein:

the side of the balancing piece (0709) facing the fan section (300) is capable of introducing gas in the fan section (300) to form a pressure P1, the side of the balancing piece (0709) facing the compressor section (200) is capable of introducing gas in the turbine section (100) to form a pressure P2, and P2> P1.

3. The cycle machine of claim 2, wherein:

the turbine section (100) comprises an expansion casing (01) having an expansion chamber (011) inside, the cycle machine further comprising a communication channel and a first chamber (0502), the first chamber (0502) being formed on the side of the balancing member (0709) facing the compressor section (200) to generate a pressure P2 on the balancing member (0709), the communication channel being able to introduce gas from the expansion chamber (011) at one end and to introduce it into the first chamber (0502) at the other end.

4. The cycle machine of claim 3, wherein:

the utility model discloses a fan, including intercommunication passageway, fan portion (300), fan seat (05), first gas circuit (0101), connecting line (0501), first gas circuit (0101) sets up on expansion shell (01) and with expansion chamber (011) intercommunication, fan portion (300) still includes fan seat (05), second gas circuit (0501) are seted up on fan seat (05), connecting line (03) are located expansion shell (01) with the outside of fan seat (05), just the one end of connecting line (03) can with first gas circuit (0101) intercommunication is in order to follow introduce gas in first gas circuit (0101), the other end can with second gas circuit (0501) intercommunication is in order to carry gas to in second gas circuit (0501), the other end of second gas circuit (0501) with first chamber (0502) intercommunication.

5. The cycle machine of claim 4, wherein:

the circulator further comprises a first connecting piece (02) and a second connecting piece (04), the first connecting piece (02) is fixedly connected to the expansion shell (01), the second connecting piece (04) is fixedly connected to the fan base (05), one end of the connecting pipeline (03) is fixed to the first connecting piece (02), and the other end of the connecting pipeline (03) is fixedly connected to the second connecting piece (04).

6. The cycle machine of claim 3, wherein:

the compressor further comprises a radial bearing (0715), the radial bearing (0715) is arranged on one side of the balance part (0709) facing the compressor part (200), and the first chamber (0502) is clamped between the radial bearing (0715) and the balance part (0709).

7. The cycle machine of claim 6, wherein:

the radial bearing (0715) is sleeved with the radial journal (0704), one axial end of the radial journal (0704) is abutted to the balance piece (0709), and the axial pneumatic resultant force acting on the balance piece (0709) is F4 ═ pi (d)₁ ²-d₂ ²) (P2-P1)/4, wherein d₁Is the outer diameter of the balance member (0709), d₂Is the outer diameter of the radial journal (0704) and has d₁/d₂The value range of (A) is 1.27-1.72.

8. The cycle machine according to any one of claims 2 to 7, wherein:

the circulating machine further comprises a second chamber (301), the second chamber (301) is formed on one side of the balance piece (0709) facing the fan part (300) to generate pressure P1 for the balance piece (0709), the fan part (300) comprises fan blades (0710), and the second chamber (301) is clamped between the fan blades (0710) and the balance piece (0709).

9. The cycle machine according to any one of claims 1 to 8, wherein:

and a dynamic sealing piece (06) is further arranged on the radial periphery of the balance piece (0709).

10. The cycle machine according to any one of claims 1 to 9, wherein:

the thrust structure comprises a first thrust bearing (0801), a second thrust bearing (0802) and a thrust part (0705), wherein the first thrust bearing (0801) is located on one axial side of the thrust part (0705), the second thrust bearing (0802) is located on the other axial side of the thrust part (0705), the thrust part (0705) can be in contact with the first thrust bearing (0801) to offset the axial force in the first axial direction through the first thrust bearing (0801), and the thrust part (0705) can also be in contact with the second thrust bearing (0802) to offset the axial force in the second axial direction through the second thrust bearing (0802).

11. The cycle machine of claim 10, wherein:

the shaft (0701) comprises a first shaft section (71) and a second shaft section (72) which are connected, the outer diameters of the first shaft section (71) and the second shaft section (72) are different, a step surface (0714) is formed at the joint of the first shaft section and the second shaft section, and the thrust part (0705) is clamped at the position of the step surface (0714).

12. The cycle machine of claim 10, wherein:

the fan part (300) comprises a fan blade (0710), the compressor part (200) comprises a compression impeller (0702), the turbine part (100) comprises an expansion impeller (0706), the axial aerodynamic resultant force acting on the fan blade (0710) is F1, the axial aerodynamic resultant force acting on the compression impeller (0702) is F2, the axial aerodynamic resultant force acting on the expansion impeller (0706) is F3, the axial aerodynamic resultant force acting on the balance piece (0709) is F4, the bearing resultant forces of the first thrust bearing (0801) and the second thrust bearing (0802) acting on the thrust part (0705) together are F5, F1, F2, F3, F4 and F5 along the direction of the axis (0713) of the shaft (0701), and the balance relation formula is satisfied: f1+ F3 ═ F2+ F4+ F5.

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