A circulating machine

Abstract

The present disclosure provides a circulating machine, comprising a shaft, a turbine part, a compressor part and a fan part, a thrust structure and a balance piece, the turbine part, the compressor part and the fan part share the shaft, and the thrust structure and the balance piece are both sleeved on 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, a side of the balance piece facing the fan part can introduce gas to form a pressure P1, a side of the balance piece facing the compressor part can introduce gas to form a pressure P2, P2≠P1. According to the present disclosure, the axial aerodynamic load of the rotor system can be reduced, the carrying capacity of the thrust bearing can be reduced, the structure of the aerodynamic thrust bearing is easy to realize, the reliability of the aerodynamic bearing is improved, the implementation difficulty of the aerodynamic thrust bearing is reduced, and the reliability design of the aerodynamic bearing is facilitated.

Description

Technical Field

[0001] This disclosure relates to the field of air circulator technology, and specifically to a circulator. Background Technology

[0002] A compressed air circulation refrigeration system using air as the working fluid employs a turbine compressor and an expander to achieve the compression and expansion processes respectively. The system also requires a fan for convective heat exchange. Gas expansion outputs work, while gas compression and fan operation consume work. If the work done by gas expansion is used for gas compression and fan operation, energy savings can be achieved.

[0003] An air circulator used in a compressed air refrigeration system comprises an expansion impeller, a compression impeller, and fan blades. The rotor system is axially supported by a pair of thrust pneumatic bearings. The axial aerodynamic imbalance among the expansion impeller, compression impeller, and fan blades needs to be distributed onto the thrust pneumatic bearings. This allows the thrust pneumatic bearing force to counteract the axial aerodynamic force of the rotor system.

[0004] Because existing air circulators have technical problems such as large axial aerodynamic loads, which lead to excessive load on the thrust bearing and affect the bearing's reliability, this disclosure studies and designs a circulator.

[0005] Public content

[0006] Therefore, the technical problem to be solved by this disclosure is to overcome the defects of the existing air circulation machine, which has a large axial aerodynamic load, resulting in excessive load on the thrust bearing and affecting the reliability of the bearing, thereby providing a circulation machine.

[0007] To solve the above problems, this disclosure provides a circulating machine, including a shaft, a turbine section, a compressor section and a fan section, a thrust structure and a balancing component, wherein the turbine section, the compressor section and the fan section share the shaft, and the thrust structure and the balancing component are both sleeved on the shaft;

[0008] The thrust structure is located between the turbine section and the compressor section, the balance member is located between the fan section and the compressor section, and the side of the balance member facing the fan section can introduce gas to form pressure P1, and the side of the balance member facing the compressor section can introduce gas to form pressure P2, P2≠P1.

[0009] In some embodiments, the side of the balancing member facing the fan section can introduce gas from the fan section to form pressure P1, and the side of the balancing member facing the compressor section can introduce gas from the turbine section to form pressure P2, and P2>P1.

[0010] In some embodiments, the turbine portion includes an expansion housing with an expansion chamber inside. The circulating machine also includes a connecting passage and a first chamber formed on the side of the balancing member facing the compressor portion to generate pressure P2 on the balancing member. One end of the connecting passage is capable of introducing gas from the expansion chamber and the other end is capable of introducing gas into the first chamber.

[0011] In some embodiments, the communication channel includes a first gas passage, a connecting pipe, and a second gas passage. The first gas passage is disposed on the expansion shell and communicates with the expansion chamber. The fan part also includes a fan base. The second gas passage is opened on the fan base. The connecting pipe is located outside the expansion shell and the fan base. One end of the connecting pipe can communicate with the first gas passage to introduce gas from the first gas passage, and the other end can communicate with the second gas passage to deliver gas to the second gas passage. The other end of the second gas passage communicates with the first chamber.

[0012] In some embodiments, the circulation machine further includes a first connector and a second connector, the first connector being fixedly connected to the expansion shell, the second connector being fixedly connected to the fan base, one end of the connecting pipe being fixed to the first connector, and the other end of the connecting pipe being fixedly connected to the second connector.

[0013] In some embodiments, a radial bearing is also included, which is disposed on the side of the balancer facing the compressor portion, and the first chamber is sandwiched between the radial bearing and the balancer.

[0014] In some embodiments, a radial journal is also included, which is sleeved on the radial inner circumference of the radial bearing, and one axial end of the radial journal abuts against the balance member. The axial aerodynamic resultant force acting on the balance member is F4 = π(d1) / 2. 2 -d2 2 )*(P2-P1) / 4, where d1 is the outer diameter of the balance component, d2 is the outer diameter of the radial journal, and the value range of d1 / d2 is 1.27 to 1.72.

[0015] In some embodiments, the circulation machine further includes a second chamber formed on the side of the balancing member facing the fan portion to generate pressure P1 on the balancing member, the fan portion including fan blades, with the second chamber sandwiched between the fan blades and the balancing member.

[0016] In some embodiments, a dynamic seal is also provided on the radial outer periphery of the balancing member.

[0017] In some embodiments, the thrust structure includes a first thrust bearing, a second thrust bearing, and a thrust portion. The first thrust bearing is located on one axial side of the thrust portion, and the second thrust bearing is located on the other axial side of the thrust portion. The thrust portion can contact the first thrust bearing to offset the axial force in the first axial direction through the first thrust bearing. The thrust portion can also contact the second thrust bearing to offset the axial force in the second axial direction through the second thrust bearing.

[0018] In some embodiments, the shaft includes a first shaft segment and a second shaft segment that are joined together, the outer diameters of the first shaft segment and the second shaft segment being different, and a stepped surface being formed at the junction of the two, the thrust member being engaged at the position of the stepped surface.

[0019] In some embodiments, the fan section includes fan blades, the compressor section includes a compression impeller, and the turbine section includes an expansion impeller. The axial aerodynamic resultant force acting on the fan blades is F1, the axial aerodynamic resultant force acting on the compression impeller is F2, the axial aerodynamic resultant force acting on the expansion impeller is F3, the axial aerodynamic resultant force acting on the balance member is F4, and the bearing resultant force acting on the thrust part by the first thrust bearing and the second thrust bearing is F5. F1, F2, F3, F4, and F5 are along the axis of the shaft and satisfy the balance relationship: F1 + F3 = F2 + F4 + F5.

[0020] The circulation machine disclosed herein has the following beneficial effects:

[0021] 1. This disclosure provides a balancing component between the blower section and the compressor section. Pressure P1 is formed by introducing pressure on the side of the balancing component facing the blower, and pressure P2 from the turbine is introduced on the side of the balancing component facing the air compressor. The pressure difference between P2 and P1 acts on the balancing component, which reduces the axial aerodynamic load on the rotor system, i.e., reduces the load on the pneumatic thrust bearing, thereby reducing the load-bearing capacity of the thrust bearing. This facilitates the structural implementation of the pneumatic thrust bearing, improves the reliability of the pneumatic bearing, reduces the implementation difficulty of the pneumatic thrust bearing, and is beneficial to the reliability design of the pneumatic bearing.

[0022] 2. This disclosure further addresses the issue by placing a first thrust bearing on the stepped surface of the shaft, and placing a first thrust bearing on one axial side of the thrust bearing and a second thrust bearing on the other axial side of the thrust bearing. The first thrust bearing contacts the thrust bearing to counteract the aerodynamic axial force in the first axial direction, and the second thrust bearing contacts the thrust bearing to counteract the aerodynamic axial force in the second axial direction. This allows the aerodynamic axial force generated by the movement of the fan, compressor, and turbine to act on the shaft, which is then directly transmitted to the first or second thrust bearing via the thrust bearing. This effectively distributes the axially unbalanced aerodynamic force between the expansion impeller, compression impeller, and fan blades to the two thrust pneumatic bearings. Ultimately, the thrust pneumatic bearing force effectively counteracts the axial aerodynamic force of the rotor system, solving the problem of unbalanced aerodynamic axial force in the air circulator due to the inability to effectively distribute the axial aerodynamic load to the thrust bearings. This achieves the effect of an independent thrust bearing structure effectively distributing the axial aerodynamic load to the thrust bearings and facilitates easy assembly, disassembly, and maintenance. Attached Figure Description

[0023] Figure 1 This is a three-dimensional structural diagram of the air circulator disclosed herein;

[0024] Figure 2 This is a front internal sectional view of the air circulator disclosed herein;

[0025] Figure 2a yes Figure 2 A magnified view of part A in the middle;

[0026] Figure 2b yes Figure 2 A magnified view of part B in the middle section;

[0027] Figure 3 This is an exploded structural diagram of the thrust structure in the air circulator disclosed herein;

[0028] Figure 4 This is a diagram showing the dimensional relationship between the shaft and the thrust section in the thrust structure of the air circulator disclosed herein.

[0029] The reference numerals in the attached figures are as follows:

[0030] 100. Turbine section; 200. Compressor section; 300. Fan section; 301. Second chamber; 400. Thrust structure; 01. Expansion shell; 011. Expansion chamber; 0101. First air passage; 02. First connecting piece; 0201. Third air passage; 0202. Fourth air passage; 03. Connecting pipe; 04. Second connecting piece; 0401. Fifth air passage; 05. Fan base; 0501. Second air passage; 0502. First chamber; 06. Dynamic seal; 07. Rotor system; 0701. Shaft; 71 71. First shaft section; 72. Second shaft section; 0702. Compression impeller; 0703. Axial positioning component; 0704. Radial journal; 0705. Thrust section; 0706. Expansion impeller; 0707. Expansion impeller positioning shim; 0708. Expansion wheel locking bolt; 0709. Balancing component; 0710. Fan blade; 0711. Fan blade positioning shim; 0712. Fan blade locking bolt; 0713. Shaft axis; 0714. Stepped surface; 0715. Radial bearing; 0801. First thrust bearing; 0802. Second thrust bearing. Detailed Implementation

[0031] like Figure 1-4 As shown, this disclosure provides a circulation machine (preferably an air circulation machine), which includes:

[0032] The components include a shaft 0701, a turbine section 100, a compressor section 200, a fan section 300, a thrust structure 400, and a balance component 0709. The turbine section 100, the compressor section 200, and the fan section 300 share the shaft 0701. The thrust structure 400 and the balance component 0709 are both sleeved on the shaft 0701.

[0033] The thrust structure 400 is located between the turbine section 100 and the compressor section 200. The balance member 0709 is located between the fan section 300 and the compressor section 200. The side of the balance member 0709 facing the fan section 300 can introduce gas to form pressure P1, and the side of the balance member 0709 facing the compressor section 200 can introduce gas to form pressure P2, where P2 ≠ P1.

[0034] This disclosure utilizes a balancing component installed between the blower and compressor sections. Pressure P1 is introduced from the blower side of the balancing component, and pressure P2 is introduced from the compressor side. The pressure difference between P2 and P1 acts on the balancing component, reducing the axial aerodynamic load on the rotor system, thus reducing the load on the pneumatic thrust bearing. This lowers the thrust bearing's load-bearing capacity, facilitates the structural implementation of the pneumatic thrust bearing, improves its reliability, reduces the implementation difficulty, and promotes reliable pneumatic bearing design.

[0035] like Figure 4 As shown, since the thrust bearing is located between the compressor and the expander, the axial force F5 exerted by the gas on the thrust bearing is to the left. Therefore, the introduced gas pressure P2 should be greater than P1 to generate F4 to the left, thereby reducing F5. This can be changed depending on factors such as the source location of the introduced gas.

[0036] In some embodiments, the side of the balancing member 0709 facing the fan section 300 can introduce gas from the fan section 300 to form pressure P1, and the side of the balancing member 0709 facing the compressor section 200 can introduce gas from the turbine section 100 to form pressure P2, where P2 > P1. This disclosure utilizes a balancing member disposed between the fan section and the compressor section. The side of the balancing member facing the fan introduces pressure from inside the fan to form pressure P1, and the side of the balancing member facing the compressor introduces pressure P2 from the turbine. The pressure difference between P2 and P1 acts on the balancing member, reducing the axial aerodynamic load on the rotor system, i.e., reducing the load acting on the pneumatic thrust bearing, thereby reducing the load-bearing capacity of the thrust bearing. This facilitates the structural implementation of the pneumatic thrust bearing, improves its reliability, reduces the implementation difficulty, and benefits the reliability design of the pneumatic bearing.

[0037] like Figure 1 As shown. In an air circulator used in a compressed air refrigeration system, the rotational power of rotor system 07 comes from the expansion work of the gas. After flowing into the expansion inlet T01, the gas expands and performs work, lowering its temperature. The low-temperature gas flows out from the expansion outlet T02 and is transported to the area requiring cooling. The expansion work drives rotor system 07 to rotate. The compression impeller on rotor system 07 draws in gas from compression inlet C01, compresses it, and discharges it from compression outlet C02. Simultaneously, the fan blades on rotor system 07 draw in air from fan inlet F01 and discharge it at fan outlet F02, driving the airflow.

[0038] like Figure 2 As shown, the rotor system 07 is axially supported by a pair of thrust pneumatic bearings (including a first thrust bearing 0801 and a second thrust bearing 0802). The thrust pneumatic bearings counteract the axial imbalance of aerodynamic forces among the expansion impeller, the compression impeller, and the fan blades.

[0039] In some embodiments, the turbine section 100 includes an expansion housing 01, the interior of which has an expansion chamber 011. The circulating machine also includes a connecting channel and a first chamber 0502, the first chamber 0502 being formed on the side of the balance member 0709 facing the compressor section 200 to generate pressure P2 on the balance member 0709. One end of the connecting channel can introduce gas from the expansion chamber 011, and the other end can introduce it into the first chamber 0502. This is a preferred structural form of the circulating machine of this disclosure. By providing a connecting channel and a first chamber on the side of the balance member facing the compressor section, gas can be effectively introduced from the expansion chamber through the connecting channel into the first chamber, thereby generating 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 located in the external space (e.g., outside the fan), where the pressure is relatively low and further decreases with increasing height.

[0040] In some embodiments, the communication channel includes a first air passage 0101, a connecting pipe 03, and a second air passage 0501. The first air passage 0101 is disposed on the expansion shell 01 and communicates with the expansion chamber 011. The fan part 300 also includes a fan base 05. The second air passage 0501 is opened on the fan base 05. The connecting pipe 03 is located outside the expansion shell 01 and the fan base 05. One end of the connecting pipe 03 can communicate with the first air passage 0101 to introduce gas from the first air passage 0101, and the other end can communicate with the second air passage 0501 to deliver gas to the second air passage 0501. The other end of the second air passage 0501 communicates with the first chamber 0502. This is a preferred structural form of the communication channel disclosed herein, which includes a first air passage disposed on the expansion shell and a second air passage disposed on the blower. The first air passage is used to communicate with the expansion chamber to introduce expansion gas, and the second air passage is used to introduce gas from the connecting pipe into the first chamber. The connecting pipe effectively connects and guides the gas. The connecting pipe is disposed outside the expansion shell, which can reduce the complexity of the internal structure and make the internal structure more compact.

[0041] In some embodiments, the circulation machine further includes a first connector 02 and a second connector 04. The first connector 02 is fixedly connected to the expansion shell 01, and the second connector 04 is fixedly connected to the fan base 05. One end of the connecting pipe 03 is fixed to the first connector 02, and the other end of the connecting pipe 03 is fixedly connected to the second connector 04. This disclosure effectively fixes and connects one end of the connecting pipe by means of the first connector fixedly mounted on the expansion shell, and effectively fixes and connects the other end of the connecting pipe by means of the second connector fixedly mounted on the fan base.

[0042] In some embodiments, the first connector 02 is internally provided with a third air passage 0201 and a fourth air passage 0202. One end of the third air passage 0201 is connected to the first air passage 0101, and the other end is connected to one end of the fourth air passage 0202. The other end of the fourth air passage 0202 is connected to one end of the connecting pipe 03. This is a preferred internal structure of the first connector of this disclosure. Through the third and fourth air passages internally provided, gas can flow into the connecting pipe sequentially through the expansion chamber, the first air passage, the third air passage, and the fourth air passage, forming an effective connection and connection.

[0043] In some embodiments, the second connector 04 is provided with a fifth air passage 0401, one end of which is connected to the connecting pipe 03 and the other end is connected to the second air passage 0501. This is a preferred internal structure of the second connector of this disclosure. Through the fifth air passage, gas can flow sequentially through the connecting pipe and the fifth air passage into the second air passage of the fan base, and further into the first chamber, forming an effective connection and connection.

[0044] like Figure 2 As shown. A first air passage 0101 is provided at the inlet of the expansion shell 01. A third air passage 0201 and a fourth air passage 0202 are arranged on the first connector 02. The third air passage 0201 and the fourth air passage 0202 are interconnected, and the third air passage 0201 is connected to the first air passage 0101. The connecting pipe 03 is welded and assembled integrally with the first connector 02. The fourth air passage 0202 passes through the connecting pipe 03. The first connector 02 is fixedly assembled on the expansion shell 01, and a sealing gasket is provided between the first connector 02 and the expansion shell 01 to eliminate leakage between them.

[0045] The second connector 04 is welded and assembled into one piece with the connecting pipe 03. A fifth air passage 0401 is arranged on the second connector 04, and the fifth air passage 0401 passes through the connecting pipe 03. The second connector 04 is fixedly assembled on the fan base 05, and a sealing gasket is placed between the second connector 04 and the fan base 05 to eliminate leakage between them. A second air passage 0501 is arranged on the fan base, and the second air passage 0501 passes through the fifth air passage 0401.

[0046] In some embodiments, the third air passage 0201 extends in the same direction as the first air passage 0101, and the fourth air passage 0202 extends perpendicularly to the third air passage 0201, with one end of the fourth air passage 0202 connected to it extending in the same direction. This is a preferred structural form of the third and fourth air passages of this disclosure, which can buffer the airflow.

[0047] In some embodiments, the extension direction of the fifth air passage 0401 is the same as the extension direction of the other end of the connecting pipe 03 connected to it, and the extension direction of the fifth air passage 0401 and the extension direction of the second air passage 0501 connected to it form a non-parallel inclined angle. This is a preferred structural form of the fifth air passage of this disclosure, which can buffer the airflow and reduce the opening length of the second air passage.

[0048] In some embodiments, a radial bearing 0715 is also included, which is disposed on the side of the balancer 0709 facing the compressor section 200, and the first chamber 0502 is sandwiched between the radial bearing 0715 and the balancer 0709. The radial bearing provided in this disclosure, in addition to effectively providing radial support to the shaft, also forms the required first chamber with the balancer to introduce gas pressure from the expansion chamber, thereby generating pressure on the balancer and balancing part of the axial aerodynamic load, thus reducing the axial balancing force acting on the thrust section.

[0049] In some embodiments, a radial journal 0704 is also included, which is sleeved on the radial inner circumference of the radial bearing 0715, and one axial end of the radial journal 0704 abuts against the balance member 0709. The axial aerodynamic resultant force acting on the balance member 0709 is F4 = π(d1) / 2. 2 -d2 2 )*

[0050] (P2-P1) / 4, where d1 is the outer diameter of the balancer 0709 and d2 is the outer diameter of the radial journal 0704. This is the calculation formula for the axial aerodynamic force on the balancer disclosed herein. The force F4 generated by introducing gas can effectively balance part of the axial aerodynamic load on the shaft, thereby reducing the axial balancing force acting on the thrust portion.

[0051] In some implementations, the value of d1 / d2 ranges from 1.27 to 1.72. If the outer diameter d1 of the balancer 0709 is too small, F4 will be too small. According to the force balance equation, the resultant bearing force F5 will be large, which is detrimental to improving the reliability of the thrust bearing. Conversely, if the outer diameter d1 of the balancer 0709 is too large, although this is beneficial to the reliability of the thrust bearing, it will increase the dynamic leakage between the dynamic seal 06 and the axial balancer 0709. Therefore, to simultaneously ensure the reliability of the thrust bearing and reduce dynamic leakage, the value of d1 / d2 is set between 1.27 and 1.72.

[0052] In some embodiments, the circulating machine further includes a second chamber 301 formed on the side of the balancing member 0709 facing the fan section 300 to generate pressure P1 on the balancing member 0709. The fan section 300 includes a fan blade 0710, and the second chamber 301 is sandwiched between the fan blade 0710 and the balancing member 0709. This is a further preferred structural form of the present disclosure, in which the second chamber, formed by sandwiching the fan blade on the side of the balancing member facing the fan section, allows gas in the fan section to be introduced through the second chamber, generating pressure P1.

[0053] In some embodiments, a dynamic seal 06 is further provided on the radial outer periphery of the balancing member 0709. This disclosure, by providing a dynamic seal on the radial outer periphery of the balancing member, effectively seals the balancing member portion, preventing leakage of introduced gas and thus avoiding a situation where effective pressure cannot be generated.

[0054] The dynamic seal 06 is fixedly mounted on the fan base 05. The dynamic seal 06 and the axial balance 0709 form a labyrinth seal, thereby creating a pressure difference on both sides of the balance 0709. The pressures on both sides of the balance 0709 are P1 and P2, respectively, with P2 usually greater than P1.

[0055] In some embodiments, the thrust structure includes a first thrust bearing 0801, a second thrust bearing 0802, and a thrust portion 0705 (preferably a thrust plate). The first thrust bearing 0801 is located on one axial side of the thrust portion 0705, and the second thrust bearing 0802 is located on the other axial side of the thrust portion 0705. The thrust portion 0705 can contact the first thrust bearing 0801 to counteract the axial force in the first axial direction through the first thrust bearing 0801. The thrust portion 0705 can also contact the second thrust bearing 0802 to counteract the axial force in the second axial direction through the second thrust bearing 0802. This disclosure, through the structure of a thrust portion sandwiched between two thrust bearings, can transmit axial loads through the thrust plate. The first thrust bearing counteracts the axial load in the first axial direction, and the second thrust bearing counteracts the axial load in the second axial direction, effectively transferring the axial load to the thrust bearings and improving the balance of axial loads.

[0056] In some embodiments, the shaft 0701 includes a first shaft segment 71 and a second shaft segment 72 that are connected. The outer diameters of the first shaft segment 71 and the second shaft segment 72 are different, and a stepped surface 0714 is formed at the junction of the two. The thrust portion 0705 is engaged at the position of the stepped surface 0714.

[0057] This disclosure further addresses the issue of unbalanced aerodynamic forces in air circulators by securing a first thrust member to the stepped surface of the shaft, placing a first thrust bearing on one axial side of the thrust member and a second thrust bearing on the other axial side. The first thrust bearing contacts the thrust member to counteract the aerodynamic axial force in the first axial direction, and the second thrust bearing contacts the thrust member to counteract the aerodynamic axial force in the second axial direction. This allows the aerodynamic axial forces generated by the movement of the fan, compressor, and turbine to act on the shaft, which is then directly transmitted to the first or second thrust bearing via the thrust member. This effectively distributes the axial aerodynamic forces between the expansion impeller, compression impeller, and fan blades to the two thrust pneumatic bearings, ultimately effectively counteracting the axial aerodynamic forces of the rotor system through the thrust pneumatic bearing force. This solves the problem of unbalanced aerodynamic forces remaining in the system due to the inability to effectively distribute axial aerodynamic loads to the thrust bearings, achieving the effect of an independent thrust member structure effectively distributing axial aerodynamic loads to the thrust bearings, and facilitating easy assembly, disassembly, and maintenance.

[0058] In some embodiments, the fan section 300 includes a fan blade 0710, the compressor section 200 includes a compression impeller 0702, and the turbine section 100 includes 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 member 0709 is F4, and the bearing resultant force of the first thrust bearing 0801 and the second thrust bearing 0802 acting together on the thrust part 0705 is F5. F1, F2, F3, F4, and F5 are along the axis 0713 of the shaft 0701 and satisfy the balance relationship: F1 + F3 = F2 + F4 + F5.

[0059] like Figure 3 As shown. The rotor system 07 is assembled from the shaft 0701, the compression impeller 0702, the axial positioning component 0703, the radial journal 0704 (i.e., the bushing), the thrust part 0705 (thrust plate), the expansion impeller 0706, the expansion impeller positioning shim 0707, the expansion wheel locking bolt 0708, the balance component 0709, the fan blade 0710, the fan blade positioning shim 0711, and the fan blade locking bolt 0712.

[0060] like Figure 4 As shown. The axial aerodynamic resultant force F1 of the fan blade 0710, the axial aerodynamic resultant force F2 of the compression impeller 0702, the axial aerodynamic resultant force F3 of the expansion impeller 0706, the axial aerodynamic resultant force F4 of the balance component 0709, and the bearing resultant force F5 provided by the two thrust bearings to the thrust section 0705. F1, F2, F3, F4, and F5 are on axis 0713; they only represent numerical values, and their directions are shown in the figure. Force balance equation:

[0061] F1 + F3 = F2 + F4 + F5. The magnitudes of F1, F2, and F3 depend on the operating conditions of the rotor system. When the operating conditions are constant, the values ​​of F1, F2, and F3 are determined. In this case, increasing F4 will decrease the resultant bearing force F5. A smaller resultant bearing force F5 makes it easier to implement a thrust bearing, and the reliability of the thrust bearing is easier to guarantee.

[0062] Axial aerodynamic resultant force F4=π(d1) 2 -d2 2 )*(P2-P1) / 4, where d1 is the outer diameter of the balancing component 0709 and d2 is the outer diameter of the radial journal 0704. Usually, increasing d1 increases F4 and decreases the resultant bearing force F5.

[0063] If the outer diameter d1 of the balancing component 0709 is too small, the resultant bearing force F5 will be too large, which is detrimental to improving the reliability of the thrust bearing. If the outer diameter d1 of the balancing component 0709 is too large, although it is beneficial to the reliability of the thrust bearing, it will increase the dynamic leakage between the dynamic seal 06 and the axial balancing component 0709. The value range of d1 / d2 is 1.27 to 1.72.

[0064] The relationship between F1, F2, F3, F4, and F5 is illustrated in the formula above. F1 + F3 - F2 = 310.5 N. If the axial aerodynamic force is not balanced using the 0709 balancer, i.e., F4 = 0, then the thrust bearing would need to provide a bearing force of 310.5 N, which undoubtedly increases the difficulty of implementing the pneumatic thrust bearing. Now, using the 0709 balancer with a 41 mm outer diameter, F4 = 258 N is achieved. In this case, only a pneumatic thrust bearing capable of providing 95.2 N needs to be designed, reducing the difficulty of implementing the pneumatic thrust bearing and facilitating the reliability design of the pneumatic bearing.

[0065] The above description is merely a preferred embodiment of this disclosure and is not intended to limit this disclosure. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this disclosure should be included within the protection scope of this disclosure. The above description is only a preferred embodiment of this disclosure. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of this disclosure, and these improvements and modifications should also be considered within the protection scope of this disclosure.

Claims

1. A recycling machine, characterized in that: include: The assembly includes a shaft (0701), a turbine section (100), a compressor section (200), a fan section (300), a thrust structure (400), and a balance component (0709). The turbine section (100), the compressor section (200), and the fan section (300) share the shaft (0701). The thrust structure (400) and the balance component (0709) are both mounted on the shaft (0701). The thrust structure (400) is located between the turbine section (100) and the compressor section (200), the balance member (0709) is located between the fan section (300) and the compressor section (200), and the side of the balance member (0709) facing the fan section (300) can introduce gas to form pressure P1, and the side of the balance member (0709) facing the compressor section (200) can introduce gas to form pressure P2, P1≠P2; The side of the balancing member (0709) facing the fan section (300) can introduce gas from the fan section (300) to form pressure P1, and the side of the balancing member (0709) facing the compressor section (200) can introduce gas from the turbine section (100) to form pressure P2, and P2>P1. The thrust structure includes a first thrust bearing (0801), a second thrust bearing (0802), and a thrust portion (0705). The first thrust bearing (0801) is located on one axial side of the thrust portion (0705), and the second thrust bearing (0802) is located on the other axial side of the thrust portion (0705). The thrust portion (0705) can contact the first thrust bearing (0801) to counteract the axial force in the first axial direction through the first thrust bearing (0801). The thrust portion (0705) can also contact the second thrust bearing (0802) to counteract the axial force in the second axial direction through the second thrust bearing (0802). The fan section (300) includes a fan blade (0710), the compressor section (200) includes a compression impeller (0702), and the turbine section (100) includes 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 member (0709) is F4, and the bearing resultant force of the first thrust bearing (0801) and the second thrust bearing (0802) acting together on the thrust part (0705) is F5. F1, F2, F3, F4 and F5 are along the axis (0713) of the shaft (0701) and satisfy the balance relationship: F1+F3=F2+F4+F5. The turbine section (100) includes an expansion housing (01) with an expansion chamber (011) inside. The circulating machine also includes a connecting channel and a first chamber (0502) formed on the side of the balance member (0709) facing the compressor section (200) to generate a pressure P2 on the balance member (0709). One end of the connecting channel can introduce gas from the expansion chamber (011) and the other end can introduce it into the first chamber (0502). The communication channel includes a first gas passage (0101), a connecting pipe (03), and a second gas passage (0501). The first gas passage (0101) is disposed on the expansion shell (01) and communicates with the expansion chamber (011). The fan part (300) also includes a fan base (05). The second gas passage (0501) is opened on the fan base (05). The connecting pipe (03) is located outside the expansion shell (01) and the fan base (05). One end of the connecting pipe (03) can communicate with the first gas passage (0101) to introduce gas from the first gas passage (0101), and the other end can communicate with the second gas passage (0501) to deliver gas to the second gas passage (0501). The other end of the second gas passage (0501) communicates with the first chamber (0502). It also includes a radial bearing (0715) disposed on the side of the balance member (0709) facing the compressor section (200), and the first chamber (0502) is sandwiched between the radial bearing (0715) and the balance member (0709). It also includes a radial journal (0704), which is sleeved on the radial inner circumference of the radial bearing (0715), and one axial end of the radial journal (0704) abuts against the balance member (0709). The axial aerodynamic resultant force acting on the balance member (0709) is... ,in The outer diameter of the balancing component (0709) is... The outer diameter of the radial journal (0704) is given, and it has The value range is 1.27 to 1.

72.

2. The recycling machine according to claim 1, characterized in that: The circulating machine also includes a first connector (02) and a second connector (04). The first connector (02) is fixedly connected to the expansion shell (01), and the second connector (04) is fixedly connected to the fan base (05). One end of the connecting pipe (03) is fixed to the first connector (02), and the other end of the connecting pipe (03) is fixedly connected to the second connector (04).

3. The recycling machine according to claim 1, characterized in that: The circulating machine further includes a second chamber (301) formed on the side of the balancing member (0709) facing the fan section (300) to generate pressure P1 on the balancing member (0709). The fan section (300) includes a fan blade (0710), and the second chamber (301) is sandwiched between the fan blade (0710) and the balancing member (0709).

4. The circulating machine according to claim 1, characterized in that: The radial outer periphery of the balancing component (0709) is also provided with a dynamic sealing component (06).

5. The circulating machine according to claim 1, characterized in that: The shaft (0701) includes a first shaft segment (71) and a second shaft segment (72) that are connected. The outer diameters of the first shaft segment (71) and the second shaft segment (72) are different, and a stepped surface (0714) is formed at the junction of the two. The thrust part (0705) is engaged at the position of the stepped surface (0714).

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