CN117869376A - Rotating shaft assembly and compressor - Google Patents

Abstract

The invention provides a rotating shaft assembly and a compressor. The rotating shaft assembly comprises a rotating shaft; the heat insulation structure is sleeved on the rotating shaft; and the bearing is sleeved on the heat insulation structure. According to the rotating shaft assembly and the compressor, the heat insulation structure is arranged on the rotating shaft, the bearing is sleeved on the heat insulation structure, when the working part on the rotating shaft works, the heat generated by the working part and the heat of sucked gas are transmitted to the bearing along the rotating shaft, the heat insulation structure can prevent the heat from being transmitted to the bearing, so that the temperature rise of the bearing is effectively reduced, the bearing can work at a proper temperature, the rotating shaft assembly and the compressor can work normally, the working reliability of the compressor is guaranteed, and meanwhile, the compressor can realize higher exhaust temperature and exhaust pressure, so that the heat pump assembly and the heat pump assembly have important significance in developing a heat pump compressor with high temperature rise and high pressure ratio.

Description

Rotating shaft assembly and compressor

Technical Field

The invention relates to the technical field of compression equipment, in particular to a rotating shaft assembly and a compressor.

Background

The existing centrifugal compressor motor rotating shaft is of an integrated structure, the material of the existing centrifugal compressor motor rotating shaft is high-strength alloy steel, the impeller positioning shaft shoulder and the composite bearing are made of heat-insulating materials, the composite bearing axially bears the Babbitt alloy surface and is in direct contact with the rotating shaft, the integral temperature of the impeller is higher under the conditions of high air suction temperature and impeller work, the temperature of the position of the composite bearing can be gradually increased along with the action of the air suction temperature and the impeller work, meanwhile, the temperature of the composite bearing is further increased due to the direct contact between the bearing and the rotating shaft, and the temperature of the composite bearing can be increased, so that the composite bearing cannot work normally, the reliability of a rotating shaft assembly cannot be effectively ensured, and the working efficiency and the working reliability of the compressor are seriously influenced.

Disclosure of Invention

In order to solve the technical problems that in the prior art, the suction temperature of a compressor and the working temperature of an impeller can be transmitted to a bearing to cause bearing failure and the compressor cannot reliably work, a heat insulation structure is arranged between a rotating shaft and the bearing to reduce heat from being directly transmitted to the bearing through the rotating shaft to cause bearing failure, and the rotating shaft assembly and the compressor are provided.

The invention provides a rotating shaft assembly, comprising:

a rotating shaft;

the heat insulation structure is sleeved on the rotating shaft;

and the bearing is sleeved on the heat insulation structure.

The heat insulation structure comprises at least two heat insulation rings which are coaxially arranged, all the heat insulation rings are sequentially sleeved on the rotating shaft, the bearing is sleeved on the heat insulation ring at the outermost side, and the heat conductivity of the heat insulation rings is gradually reduced along the direction from the bearing to the rotating shaft.

The heat insulation ring comprises a vacuum ring, the vacuum ring is positioned on the innermost layer of the heat insulation structure, and the vacuum ring is attached to the rotating shaft.

The number of the heat insulation rings is two, the two heat insulation rings comprise vacuum rings and outer heat insulation rings, the outer heat insulation rings are sleeved on the vacuum rings, and the thickness B1 of the vacuum rings is larger than the thickness B2 of the outer heat insulation rings.

The rotating shaft assembly further comprises a working part and a liquid cooling structure, the working part is sleeved on the rotating shaft, the working part is located on one side of the bearing, the liquid cooling structure surrounds the periphery of the rotating shaft, the liquid cooling structure is located between the working part and the bearing, and the liquid cooling structure can supply cooling medium for the rotating shaft.

The liquid cooling structure further comprises a liquid cooling ring, the liquid cooling ring surrounds the periphery of the rotating shaft, a liquid cooling channel is arranged on the liquid cooling ring, a liquid cooling outlet is formed on the inner wall of the liquid cooling ring, and the liquid cooling channel is communicated with the refrigerant supply mechanism and/or the oil supply structure.

The rotating shaft assembly further comprises a bearing seat, the bearing is arranged on the bearing seat, a first oil supply channel is arranged on the bearing seat, the bearing is communicated with the oil supply structure through the first oil supply channel, and the liquid cooling channel is communicated with the first oil supply channel.

The liquid cooling structure further comprises a communication ring, the communication ring surrounds the periphery of the rotating shaft, the liquid cooling ring is arranged on the bearing seat through the communication ring, a second oil supply channel is formed on the communication ring, and the liquid cooling channel is communicated with the first oil supply channel through the second oil supply channel.

The second oil supply channel is provided with a flow regulating mechanism; or, a flow regulating mechanism is arranged on the liquid cooling channel; or, a flow regulating mechanism is arranged at the communication position of the second oil supply channel and the liquid cooling channel.

The flow area D2 of the liquid cooling channel is smaller than the flow area D1 of the first oil supply channel.

The liquid cooling structure is provided with at least one oil return channel, and the sum of the flow areas of the oil return channels is larger than the flow area of the liquid cooling channel.

An oil passing gap is formed between the liquid cooling ring and the rotating shaft; and/or a first sealing structure is arranged between the part, close to the bearing, of the liquid cooling ring and the rotating shaft.

The rotating shaft assembly further comprises a shell, a part of the shell is located between the working part and the liquid cooling ring, the shell and the liquid cooling ring jointly enclose a liquid cooling cavity, and the liquid cooling channel is communicated with the refrigerant supply mechanism and/or the oil supply structure.

A second sealing structure is arranged between the shell and the rotating shaft, and a third sealing structure is arranged between the part, close to the bearing, of the liquid cooling ring and the rotating shaft.

The rotating shaft assembly further comprises a positioning shaft shoulder used for positioning the working part, the positioning shaft shoulder is sleeved on the rotating shaft, the shell, the positioning shaft shoulder and the liquid cooling ring jointly enclose the liquid cooling cavity, and the second sealing structure is arranged between the shell and the positioning shaft shoulder.

The number of the liquid cooling rings is two, the two liquid cooling rings comprise a first liquid cooling ring and a second liquid cooling ring, the first liquid cooling ring and the second liquid cooling ring are both encircling the periphery of the rotating shaft, the first liquid cooling ring is arranged between the second liquid cooling ring and the working part, the liquid cooling channel on the first liquid cooling ring is communicated with the refrigerant supply mechanism, and the second liquid cooling ring is communicated with the oil supply structure and/or the refrigerant supply mechanism.

The rotating shaft assembly further comprises a shell and a bearing seat, a part of the shell is located between the working part and the first liquid cooling ring, the shell and the first liquid cooling ring enclose a liquid cooling cavity together, the liquid cooling channel of the first liquid cooling ring is communicated with the refrigerant supply mechanism, the bearing is arranged on the bearing seat, a first oil supply channel is arranged on the bearing seat, the bearing is communicated with the oil supply structure through the first oil supply channel, and the liquid cooling channel on the second liquid cooling ring is communicated with the first oil supply channel.

The rotating shaft assembly further comprises a positioning shaft shoulder used for positioning the working part, the positioning shaft shoulder is sleeved on the rotating shaft, and the positioning shaft shoulder is located between the working part and the liquid cooling structure.

The thermal conductivity of the positioning shaft shoulder is lower than that of the rotating shaft.

The relation between the width L1 of the positioning shaft shoulder and the diameter D3 of the rotating shaft part mounted by the positioning shaft shoulder is as follows: L1/D3 is more than or equal to 0.6 and less than or equal to 0.7.

The rotating shaft assembly further comprises a fourth sealing structure, the fourth sealing structure is arranged on one side, away from the working part, of the bearing, and the relation between the axial distance L2 between the bearing and the positioning shaft shoulder and the axial distance L3 between the bearing and the fourth sealing structure is that: L2/L3 is less than or equal to 1.5 and less than or equal to 2.

A first avoiding distance is arranged between the liquid cooling structure and the positioning shaft shoulder; and/or a second avoiding distance is arranged between the liquid cooling structure and the bearing.

The positioning shaft shoulder is provided with a groove structure, an opening of the groove structure faces the liquid cooling structure, and the cooling medium can enter and flow out of the groove structure through the opening.

The groove structure is provided with an outer side wall far away from the rotating shaft, an included angle alpha is formed between the outer side wall and the bottom wall of the groove structure, and the included angle alpha is an obtuse angle.

When the end part of the heat insulation structure is in clearance fit with the positioning shaft shoulder, the groove structure is provided with an inner side wall close to the rotating shaft, and the diameter D4 corresponding to the inner side wall is smaller than or equal to the outer diameter D5 of the heat insulation structure.

A compressor comprises the rotating shaft assembly.

According to the rotating shaft assembly and the compressor, the heat insulation structure is arranged on the rotating shaft, the bearing is sleeved on the heat insulation structure, when the working part on the rotating shaft works, the heat generated by the working part and the heat of sucked gas are transmitted to the bearing along the rotating shaft, the heat insulation structure can prevent the heat from being transmitted to the bearing, so that the temperature rise of the bearing is effectively reduced, the bearing can work at a proper temperature, the rotating shaft assembly and the compressor can work normally, the working reliability of the compressor is guaranteed, and meanwhile, the compressor can realize higher exhaust temperature and exhaust pressure, so that the heat pump assembly and the heat pump assembly have important significance in developing a heat pump compressor with high temperature rise and high pressure ratio.

Drawings

FIG. 1 is a schematic structural diagram of a spindle assembly according to an embodiment of the present invention;

FIG. 2 is a schematic diagram of a portion of the spindle assembly according to the embodiment of the present invention shown in FIG. 1;

FIG. 3 is a schematic diagram illustrating a portion of another embodiment of the spindle assembly according to the embodiment of the present invention, which corresponds to the embodiment of FIG. 1;

FIG. 4 is a schematic view of another structure of a spindle assembly according to an embodiment of the present invention;

FIG. 5 is a schematic diagram of a portion of the spindle assembly according to the embodiment of the present invention shown in FIG. 4;

FIG. 6 is a schematic diagram of another structure of a spindle assembly according to an embodiment of the present invention;

FIG. 7 is a schematic diagram of a portion of the spindle assembly according to the embodiment of the present invention shown in FIG. 6;

FIG. 8 is a schematic diagram of another structure of a spindle assembly according to an embodiment of the present invention;

FIG. 9 is a schematic structural view of a groove structure on a positioning shoulder according to an embodiment of the present invention;

FIG. 10 is a graph of experimental data for a spindle assembly according to an embodiment of the present invention;

in the figure:

1. a rotating shaft; 2. a bearing; 31. a vacuum ring; 32. an outer insulating ring; 4. a working member; 5. a liquid cooling structure; 6. a bearing seat; 61. a first oil supply passage; 51. a second oil supply passage; 52. a liquid cooling channel; 53. a communication ring; 55. a first sealing structure; 56. an oil return hole; 7. positioning a shaft shoulder; 8. a fourth sealing structure; 9. a housing; 101. a second sealing structure; 102. a third sealing structure; 57. a first liquid cooling ring; 58. a second liquid cooling ring; 71. a groove structure; 72. an outer sidewall; 73. a bottom wall; 74. an inner sidewall.

Detailed Description

The present invention will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.

In order that those skilled in the art will better understand the present invention, a technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in which it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present invention without making any inventive effort, shall fall within the scope of the present invention.

It should be noted that the terms "first," "second," and the like in the description and the claims of the present invention and the above figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the terms so used are interchangeable under appropriate circumstances such that the embodiments of the invention described herein are, for example, capable of operation in other environments. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.

It should be noted that, in the description of the present invention, terms such as "upper," "lower," "left," "right," "inner," "outer," and the like indicate directions or positional relationships based on the directions or positional relationships shown in the drawings, which are merely for convenience of description, and do not indicate or imply that the apparatus or elements must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

Furthermore, it should be noted that, in the description of the present invention, unless explicitly specified and limited otherwise, the terms "mounted," "configured," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be directly connected, can be indirectly connected through an intermediate medium, and can also be communicated with the inside of two elements. The specific meaning of the above terms in the present invention can be understood by those skilled in the art according to the specific circumstances.

The waste heat temperature distribution range in various industrial production processes in China is wider, wherein more than 60% of industrial waste heat is distributed below 100 ℃, the waste heat temperature is mainly concentrated at 30-60 ℃, and if the waste heat in the temperature range can be efficiently improved, the recovered waste heat is applied to the heat requirement of 60-120 ℃ for heating in winter in northern areas of China or process heat in industrial production processes, so that the method is an effective way for realizing energy conservation and emission reduction. At present, although the application of the Medium Temperature Heat Pump (MTHP) is wider, the heat supply volume of the medium temperature heat pump under the prior art condition is smaller, the large-scale central heat supply requirement is difficult to meet, and the energy efficiency of domestic and commercial units is generally lower aiming at the application condition that the temperature rise is 30K. Therefore, the heat supply of 60-120 ℃ required by building heating and industrial production processes is required based on widely distributed 30-60 ℃ waste heat resources in China, development of heat pump technology is required, and particularly research and application of compression heat pump technology with high capacity, high energy efficiency ratio and high heat load adaptability are developed to effectively improve waste heat utilization efficiency, promote wide use of ultra-efficient heat pump products in the fields of industrial waste heat recovery, central heating and the like, reduce energy consumption and waste heat emission, effectively improve primary energy utilization rate in China, and have important significance for realizing strategic targets of energy conservation and emission reduction.

However, most of the existing centrifugal compressor motor rotating shafts are of integrated structures, the materials of the existing centrifugal compressor motor rotating shafts are high-strength alloy steel, heat insulation materials are not arranged at the impeller positioning shaft shoulders and the composite bearings, the composite bearings axially bear Babbitt alloy surfaces to be in positioning contact with the rotating shafts, the whole temperature of the impellers is high under the conditions of high air suction temperature and impeller work, the temperature of the positions of the composite bearings can be gradually increased along with the action of the air suction temperature and the action of the impellers, meanwhile, the temperature of the composite bearings is further increased due to the direct contact between the bearings and the rotating shafts, the temperature of the composite bearings is increased, normal work of the composite bearings cannot be performed, accordingly the reliability of rotating shaft assemblies cannot be effectively ensured, and the working efficiency and the working reliability of the compressor are seriously affected.

To this end, the present application provides a spindle assembly as shown in fig. 1 to 10, comprising: a rotating shaft 1; the heat insulation structure is sleeved on the rotating shaft 1; and the bearing 2 is sleeved on the heat insulation structure. Through setting up heat insulating structure in pivot 1 to make bearing 2 cover establish on heat insulating structure, during the during operation of the work piece on pivot 1, when its heat that produces and the heat of inhaling gas transfer to bearing 2 department along pivot 1, heat insulating structure can avoid heat transfer to bearing 2 on, thereby effectually reduced bearing 2's temperature rise, guarantee that bearing 2 can work in suitable temperature, make pivot subassembly and compressor both can normally work, the operational reliability of compressor has been guaranteed, the compressor also can realize higher exhaust temperature and exhaust pressure simultaneously, can effectually utilize 30-60 ℃ waste heat, it is significant to develop high temperature rise, high pressure ratio's heat pump compressor and heat pump set.

The cross-section of bearing 2 is annular, in order to guarantee the complete isolation to the heat of pivot 1, thermal-insulated structure includes two at least coaxial thermal-insulated rings that set up, all thermal-insulated ring overlaps in proper order and locates on the pivot 1, bearing 2 cover is located outermost on the thermal-insulated ring, and follows bearing 2 extremely the direction of pivot 1, thermal conductivity of thermal-insulated ring reduces gradually. That is, a plurality of heat insulation rings are utilized to form a plurality of annular heat insulation layers between the rotating shaft 1 and the bearing 2, so that heat can only reach the bearing 2 through the plurality of heat insulation rings in sequence, the difficulty of transferring the heat from the rotating shaft 1 to the bearing 2 is increased due to the arrangement of the plurality of heat insulation layers, thereby the purpose of reducing the heat transferred to the bearing 2 can be achieved, in addition, the heat conductivity of the heat insulation ring closest to the bearing 2 is enabled to be the lowest for further isolating the heat, the heat transfer capacity in the heat insulation structure is reduced to the greatest extent, then the heat is further isolated through the residual heat insulation layers, the heat insulation effect on the bearing 2 is the greatest, the working reliability of the bearing 2 is effectively guaranteed, and the reliability of the rotating shaft assembly and the compressor is further improved. Preferably, the heat insulation ring at the innermost layer is in interference fit with the rotating shaft 1, and in the same two adjacent heat insulation rings, the heat insulation ring at the outer layer and the heat insulation ring at the inner layer are installed in an interference fit mode, so that the fixing reliability of all the heat insulation rings and the rotating shaft 1 is ensured.

The heat insulation ring comprises a vacuum ring 31, wherein the vacuum ring 31 is positioned on the innermost layer of the heat insulation structure, and the vacuum ring 31 is attached to the rotating shaft 1. Utilize vacuum ring 31 to form the vacuum layer on the outer wall of pivot 1, utilize the contact heat transfer between vacuum reduction pivot 1 and the thermal insulation structure, furthest reduces the ability of heat transfer to in the thermal insulation structure, then further keep apart the heat through remaining thermal insulation layer for the thermal insulation effect to bearing 2 reaches the biggest, other thermal insulation rings then can block the radiation heat transfer of pivot 1 simultaneously, realize the hindrance to heat transfer from many sides, effectually reduced the possibility that the temperature of bearing 2 risees, guarantee the reliability of bearing 2 work. The vacuum ring 31 may be an annular structure with a hollow cavity formed in the middle, or a vacuum cavity formed by mutually matching a heat insulation structure with the rotating shaft 1. The vacuum ring 31 may be made of a metal material or a non-metal material with low thermal conductivity, and for the metal material, common stainless steel may be used; the nonmetallic material may be selected from epoxy cloth plates or cured by injecting a liquid medium into the vacuum ring.

As one implementation mode, the number of the heat insulation rings is two, the two heat insulation rings comprise a vacuum ring 31 and an outer heat insulation ring 32, the outer heat insulation ring 32 is sleeved on the vacuum ring 31, heat is prevented from being transferred to the bearing 2 in a contact transfer mode as much as possible by the thickness of the vacuum ring 31, meanwhile, the heat radiation generated by the rotating shaft 1 can be prevented by the outer heat insulation ring 32, the possibility of temperature rise of the bearing 2 is reduced, the purpose of guaranteeing the working reliability of the bearing 2 is achieved, meanwhile, the thickness B1 of the vacuum ring 31 is larger than the thickness B2 of the outer heat insulation ring 32, the supporting force of the bearing 2 to the rotating shaft 1 can be smoothly transferred through a heat insulation structure, and therefore the reliable rotation of the rotating shaft 1 is guaranteed, and meanwhile, the bearing requirement of the rotating shaft assembly is guaranteed. Wherein, the numerical range of the thickness of thermal-insulated structure (the sum of the thickness of all thermal-insulated rings) is 2mm to 20mm, when thermal-insulated structure's thickness is too big, can cause the weight increase of pivot subassembly, and the critical rotation speed of pivot 1 reduces for compressor's work efficiency reduces, and when thermal-insulated structure's thickness is too little, can cause thermal-insulated effect reduction of thermal-insulated structure, and thermal-insulated structure's structural strength can not satisfy the requirement simultaneously, can influence the operational reliability of pivot subassembly equally. The material of the outer heat insulation ring 32 may be stainless steel, and the heat conductivity of the stainless steel is lower than that of the alloy steel of the rotating shaft 1, so that the ability of heat transfer to the bearing can be well reduced.

The rotating shaft assembly further comprises a working part 4 and a liquid cooling structure 5, the working part 4 is sleeved on the rotating shaft 1, the working part 4 is located on one side of the bearing 2, the liquid cooling structure 5 surrounds the periphery of the rotating shaft 1, the liquid cooling structure 5 is located between the working part 4 and the bearing 2, and the liquid cooling structure 5 can supply cooling medium for the rotating shaft 1. In order to reduce the heat transferred to the position of the bearing 2 on the rotating shaft 1 as much as possible, the liquid cooling structure 5 is utilized to directly supply a cooling medium to the rotating shaft 1, the cooling medium can cool the rotating shaft 1 between the working part 4 and the bearing 2, so that the heat on the rotating shaft 1 is taken away, the heat reaching the heat insulation structure is reduced, then the heat transferred to the bearing 2 is reduced as little as possible through the heat insulation effect of the heat insulation structure, the temperature rise of the bearing 2 is reduced, thereby ensuring the reliability of the bearing 2, meanwhile, the cooling medium can also reduce the temperature of the rotating shaft 1, reduce deformation, stress change and the like possibly generated by the temperature rise of the rotating shaft 1, ensure the structural reliability of the rotating shaft 1, and further improve the working reliability of the rotating shaft assembly and the compressor. Specifically, the liquid cooling structure further comprises a liquid cooling ring, the liquid cooling ring surrounds the periphery of the rotating shaft, the liquid cooling ring is provided with a liquid cooling channel 52, the liquid cooling channel 52 forms a liquid cooling outlet on the inner wall of the liquid cooling ring, and the liquid cooling channel 52 is communicated with the refrigerant supply mechanism and/or the oil supply structure. The liquid cooling channel 52 is utilized to drain the liquid refrigerant or lubricating oil with lower temperature to the liquid cooling outlet, and flows between the liquid cooling ring and the rotating shaft through the liquid cooling outlet, and further flows into the space between the liquid cooling ring and the adjacent structure, so that the rotating shaft can be reliably cooled, the heat reaching the heat insulation structure is reduced, then the heat transferred to the bearing 2 is reduced by reducing the heat insulation effect of the heat insulation structure as little as possible, the temperature rise of the bearing 2 is reduced, and the reliability of the bearing 2 is ensured. The refrigerant supply mechanism can be a refrigerant heat exchange cycle where a compressor of the rotating shaft assembly is located, and can send liquid refrigerant in the refrigerant heat exchange cycle into the liquid cooling channel 52 to cool the rotating shaft, so that the rotating shaft can be cooled; the oil supply structure may be an oil supply cycle for supplying low-temperature lubricating oil to the bearing, and the low-temperature lubricating oil is supplied into the liquid cooling passage 52 to cool the rotating shaft, and the cooling of the rotating shaft may be achieved.

As an embodiment, as shown in fig. 2 to 5, the rotating shaft assembly further includes a bearing seat 6, the bearing 2 is disposed on the bearing seat 6, a first oil supply channel 61 is disposed on the bearing seat 6, the bearing 2 is communicated with the oil supply structure through the first oil supply channel 61, and the liquid cooling channel 52 is communicated with the first oil supply channel 61. The low-temperature lubricating oil supplied by the oil supply structure is sent into the rotating shaft assembly by the first oil supply channel 61 and is mainly supplied to the bearing 2 for lubricating and cooling the bearing 2, meanwhile, part of the low-temperature lubricating oil can be conveyed onto the rotating shaft 1 between the working part 4 and the bearing 2 through the liquid cooling channel 52, heat of the rotating shaft 1 is taken away by the low temperature of the low-temperature lubricating oil, heat transferred to the heat insulation structure is reduced, and the temperature of the bearing 2 is ensured to be in a preset temperature range.

For conveniently carrying low temperature lubricating oil to the liquid cooling passageway 52 in, the liquid cooling structure 5 still includes the connectivity ring 53, the connectivity ring 53 encircle in the periphery of pivot 1, just the liquid cooling ring passes through the connectivity ring 53 set up in on the bearing frame 6, be formed with on the connectivity ring 53 second oil supply passageway 51, the liquid cooling passageway 52 passes through second oil supply passageway 51 with first oil supply passageway 61 intercommunication, through setting up connectivity ring 53, can realize fixing the liquid cooling ring, guarantee that the structure of liquid cooling ring is reliable, also can guarantee that low temperature lubricating oil can flow under the effect of passing through second oil supply passageway 51 and liquid cooling passageway 52 smoothly in proper order to pivot 1 in order to cool off pivot 1. The communication ring 53 is located the terminal surface of liquid cooling ring orientation bearing frame 6 to the one end and the bearing frame 6 intercommunication of communication ring 53, the other end and liquid cooling ring intercommunication, because the space between communication ring 53 and the bearing frame 6 cuts off, the bearing 2 sets up on the bearing frame 6 simultaneously, the structure of communication ring 53, liquid cooling ring and bearing frame 6 is equivalent to separating working element 4 and bearing 2 in two different spaces, make the heat can be cut off when passing through the space between working element 4 and the bearing 2, reach the purpose that has reduced the heat of transferring to bearing 2 department, further guarantee the operational reliability of bearing 2. As shown in fig. 2, the second oil supply channel 51 on the communication ring 53 and the liquid cooling channel 52 on the liquid cooling ring are arranged in an included angle (90 ° as shown in the drawing), wherein the communication ring 53 and the liquid cooling ring may be in an integral structure, when the second oil supply channel 51 and the liquid cooling channel 52 are processed, the second oil supply channel 51 may be formed by opening from the end surface of the communication ring 53 toward the liquid cooling ring, the liquid cooling channel 52 may be formed by opening from the outer wall of the liquid cooling ring toward the inner wall of the liquid cooling ring, and the two through holes may be communicated with each other,

Further, as shown in fig. 2, the second oil supply passage 51 is provided with a flow rate adjusting mechanism; the flow in the second oil supply channel 51 and the liquid cooling channel 52 is regulated by the flow regulating mechanism, so that the lubricating oil supply of the bearing 2 can be ensured, the temperature of the rotating shaft 1 can be controlled by the regulation of the flow regulating mechanism, the problem that the temperature of the rotating shaft 1 is low due to excessive low-temperature lubricating oil flow reaching the rotating shaft 1 is avoided, and the working reliability of the rotating shaft 1 is further ensured. Wherein the flow regulating structure is a throttle plug, for example, a plug structure located at the end face of the communication ring 53 of the second oil supply passage 51 in fig. 2.

In an embodiment not shown in the drawings, a flow rate adjustment mechanism is provided at a communication position of the second oil supply passage 51 and the liquid cooling passage 52; or, the liquid cooling channel 52 is provided with a flow adjusting mechanism, that is, the flow of the low-temperature lubricating oil at the liquid cooling outlet is controlled by arranging the flow adjusting mechanism between the first oil supply channel 61 and the liquid cooling outlet as required, so that the lubrication of the bearing 2 by the low-temperature lubricating oil can be ensured to be reliable, and the purpose of controlling the cooling degree of the rotating shaft 1 to ensure the working reliability of the rotating shaft 1 can be realized.

In order to ensure reliable lubrication of the bearing 2, the flow area D2 of the liquid cooling passage 52 is smaller than the flow area D1 of the first oil supply passage 61. By reducing the flow area, the flow rate of the low-temperature lubricating oil flowing into the second oil supply passage 51 is reduced, so that the low-temperature lubricating oil supplied in the first oil supply passage 61 can be preferentially supplied to the bearing 2, ensuring the operational reliability of the bearing 2.

Meanwhile, in order to ensure that low-temperature lubricating oil for cooling the rotating shaft 1 can smoothly flow out of the rotating shaft assembly to be cooled, at least one oil return channel is arranged on the liquid cooling structure 5, the sum of the flow areas of the oil return channels is larger than the flow area of the second oil supply channel 51, at the moment, all the oil return channels can ensure that the low-temperature lubricating oil supplied by the second oil supply channel 51 is completely discharged, the problem that the lubricating oil cannot cool the rotating shaft 1 due to difficult oil return caused by the fact that the lubricating oil is stored in a space surrounded by the liquid cooling structure 5 and the rotating shaft 1 can be avoided, the problem that the lubricating oil cannot be discharged after exchanging heat with the rotating shaft 1 is solved, the reliable cooling of the rotating shaft 1 is ensured, and the reliable oil supply of the bearing 2 is ensured. Preferably, the oil return channel forms a plurality of oil return holes 56 on the inner wall of the liquid cooling structure facing the rotating shaft, the number of the oil return holes 56 is 4 to 6, and all the oil return holes 56 are uniformly distributed below the horizontal plane where the axis of the rotating shaft 1 is located, so that the oil return reliability is ensured.

Because the liquid cooling structure 5 needs to be communicated with the bearing seat 6 to supply low-temperature lubricating oil, the liquid cooling structure 5 is also a static structure, and the rotating shaft 1 is a rotating motion structure, therefore, an oil passing gap is formed between the liquid cooling structure 5 and the rotating shaft 1, the liquid cooling structure 5 and the rotating shaft 1 can move relatively by utilizing the oil passing gap without interference, meanwhile, the oil passing gap can also ensure that the low-temperature lubricating oil supplied by the liquid cooling structure 5 can reliably flow onto the rotating shaft 1 and flow to an oil return channel for discharging after absorbing heat on the rotating shaft 1, and the cooling reliability of the liquid cooling structure 5 to the rotating shaft 1 is ensured. The range of the value of the oil passing gap is 0.5mm to 1mm, when the value of the oil passing gap is too large, the low-temperature lubricating oil supplied by the liquid cooling structure 5 can flow through the oil passing gap in a large amount and cannot flow through the rotating shaft 1, so that the problem of low cooling efficiency of the rotating shaft 1 is caused by the fact that the heat on the rotating shaft 1 cannot be taken away, and when the oil passing gap is too small, the low-temperature lubricating oil cannot smoothly flow to the oil return channel to accumulate in the oil passing gap, the heat on the rotating shaft 1 cannot be taken away, and the problem that the oil supply amount of the bearing 2 cannot be ensured due to the fact that the lubricating oil cannot be discharged is caused.

In order to prevent the low-temperature lubricating oil fed by the liquid cooling structure 5 from flowing in the direction of the bearing 2 after exchanging heat with the rotating shaft 1, a first sealing structure 55 is arranged between the part, close to the bearing 2, of the liquid cooling structure 5 and the rotating shaft 1. The flow path of the lubricating oil exchanging heat with the rotating shaft 1 is limited by the first sealing structure 55, namely, the temperature rise of the bearing 2 caused by the flowing of the lubricating oil after heat absorption to the bearing 2 can be avoided, the lubricating oil can be ensured to flow to the oil return channel for discharging according to the preset path, and the oil return reliability of the liquid cooling structure 5 is ensured.

As shown in fig. 2, the part of the rotating shaft 1 corresponding to the liquid cooling structure 5 is also covered with a heat insulation structure, at this time, the low-temperature lubricating oil of the liquid cooling structure 5 not only can cool the rotating shaft 1, but also can absorb part of heat on the heat insulation structure, further reduces the heat transferred to the bearing 2, reduces the temperature rise of the bearing 2, and ensures the working reliability of the bearing 2.

As shown in fig. 3, the portion of the rotating shaft 1 corresponding to the liquid cooling structure 5 is not provided with a heat insulation structure, at this time, the liquid cooling structure 5 can directly cool the rotating shaft 1, so that the temperature of the portion of the rotating shaft 1 corresponding to the heat insulation structure is reduced, the heat transferred to the position of the bearing 2 is further reduced, the temperature rise of the bearing 2 is reduced, and the working reliability of the bearing 2 is ensured.

As another embodiment, as shown in fig. 6 and 7, the spindle assembly further includes a housing 9, a portion of the housing 9 is located between the working member 4 and the liquid cooling ring, the housing 9 and the liquid cooling ring jointly enclose a liquid cooling cavity, and the liquid cooling channel 52 is in communication with the refrigerant supply mechanism and/or the oil supply structure. The difference from the previous embodiment is that the liquid cooling ring is connected with the housing 9 and encloses a liquid cooling cavity, at this time, the liquid cooling ring is directly fixed on the housing 9, and the liquid cooling channel 52 in the liquid cooling ring is directly communicated with an external coolant supply mechanism and/or an oil supply structure, so that on the premise of ensuring reliable cooling of the rotating shaft, structural contact between the liquid cooling channel 52 and the bearing is avoided, and heat transfer is further reduced. Meanwhile, when the rotating shaft assembly works, the rotating shaft 1 drives the working part 4 to rotate, so that the working part 4 is utilized to apply work to corresponding fluid, in the process, the fluid flowing to the working part 4 and the working part 4 can not only cause the temperature rise of the rotating shaft 1 in the process of rotating to apply work, but also cause the temperature rise of the environment where the rotating shaft assembly is located, that is, the heat at the working part 4 can not only be transmitted through the rotating shaft 1, but also be diffused and transmitted through the environment where the rotating shaft assembly is located, at the moment, a liquid cooling cavity is formed by the shell 9 and the liquid cooling ring together, so that a cavity for isolating heat can be formed between the working part 4 and the bearing 2, and the heat generated at the working part 4 can not be continuously transmitted to the bearing 2 through the liquid cooling cavity, so that the temperature rise of the bearing 2 is further avoided, and the working reliability of the bearing 2 is ensured.

Because there is the fluid of high temperature high pressure in work part 4 department, and need rotate relatively between casing 9 and the pivot for inevitably there is the clearance of dodging between casing 9 and the pivot, the interior pressure of liquid cooling passageway 52 is less than the fluid pressure of work part 4 department simultaneously, makes the fluid of work part 4 department flow to the liquid cooling intracavity under the effect of pressure, for this, casing 9 with be provided with second seal structure 101 between the pivot 1, utilize second seal structure 101 to guarantee the relative seal in liquid cooling chamber and the space where work part 4 is located, can guarantee the work efficiency of work part 4, also can guarantee the cooling reliability of liquid cooling chamber to the pivot. Meanwhile, because there is relative rotation between the liquid cooling ring and the rotating shaft, there is inevitably an avoidance gap between the liquid cooling ring and the rotating shaft, the cooling medium in the liquid cooling cavity can flow to the bearing 2 through the avoidance gap after absorbing the heat of the rotating shaft, and the temperature of the bearing 2 can still be influenced, for example, when the liquid cooling channel 52 sends the low-temperature liquid refrigerant to the rotating shaft, the low-temperature liquid refrigerant can be gasified after absorbing the heat of the rotating shaft, the gasified refrigerant can flow to the direction of the bearing 2 through the avoidance gap of the liquid cooling ring and the rotating shaft, the temperature of the gasified refrigerant can influence the temperature of the bearing 2, and for this reason, a third sealing structure 102 is arranged between the part of the liquid cooling ring, which is close to the bearing, and the rotating shaft 1, and the cooling medium in the liquid cooling cavity is limited by the third sealing structure 102 so as not to flow to the bearing 2, thereby further reducing the temperature rise of the bearing 2 and improving the reliability of the bearing 2.

The rotating shaft assembly further comprises a positioning shaft shoulder 7 for positioning the working part 4, the positioning shaft shoulder 7 is sleeved on the rotating shaft 1, the shell 9, the positioning shaft shoulder 7 and the liquid cooling ring jointly enclose a liquid cooling cavity, and the second sealing structure 101 is arranged between the shell 9 and the positioning shaft shoulder. That is, location shoulder 7 and pivot 1 components of a whole that can function independently set up, can also be on the basis of guaranteeing to carry out reliable location to work part 4, can also adjust the position of work part 4 through changing location shoulder 7, make the pivot subassembly can adapt to different work part 4 and carry out different mode, improve the suitability of pivot subassembly, moreover because location shoulder 7 and pivot 1 components of a whole that can function independently set up, make the transmission efficiency of the heat between location shoulder 7 and the pivot 1 reduce, the ability of heat transfer to bearing 2 can also be reduced to location shoulder 7 this moment, further reduction transfers to the heat of bearing 2 department, reduce the temperature rise of bearing 2, guarantee the operational reliability of bearing 2. The casing 9 encircles on the periphery of location shaft shoulder 7 to set up second seal structure 101 in order to guarantee the sealed effect of liquid cooling chamber between casing 9 and location shaft shoulder 7, and then avoid the fluid of work piece 4 department to flow to the liquid cooling intracavity under the effect of pressure.

In order to ensure that the cooling medium (refrigerant or lubricating oil) can smoothly flow out of the liquid cooling cavity, a liquid return channel is further arranged on the liquid cooling ring, the liquid return channel can be communicated with a refrigerant heat exchange circulation or lubricating oil cooling structure according to the selection of the cooling medium, the cooling medium which is used for cooling the rotating shaft 1 can be smoothly discharged, and the problem that the cooling effect on the rotating shaft 1 is reduced due to the fact that the cooling medium is always stored in the liquid cooling cavity is avoided.

As another embodiment, as shown in fig. 8, the number of the liquid cooling rings is two, the two liquid cooling rings include a first liquid cooling ring 57 and a second liquid cooling ring 58, the first liquid cooling ring 57 and the second liquid cooling ring 58 are both around the outer periphery of the rotating shaft, the first liquid cooling ring 57 is disposed between the second liquid cooling ring 58 and the working member 4, the liquid cooling channel 52 on the first liquid cooling ring 57 is communicated with the refrigerant supply mechanism, and the second liquid cooling ring 58 is communicated with the oil supply mechanism and/or the refrigerant supply mechanism. The first liquid cooling ring 57 and the second liquid cooling ring 58 form a two-layer cooling heat insulation structure between the working part 4 and the bearing 2, so that the rotating shaft 1 between the working part 4 and the bearing 2 is cooled to the greatest extent, and heat transfer between the working part 4 and the bearing 2 can be isolated to the greatest extent, and the working reliability of the bearing 2 is ensured. The first liquid cooling ring 57 uses the low-temperature liquid refrigerant sent by the liquid cooling channel 52 to cool the rotating shaft 1 at a first stage, and the second liquid cooling ring 58 can select the low-temperature liquid refrigerant or the low-temperature lubricating oil to cool the rotating shaft 1 at a second stage, so that the temperature of the rotating shaft 1 at the bearing 2 is sufficiently reduced, the temperature rise of the bearing 2 is maximally reduced, and the working reliability of the bearing 2 is improved.

Similarly, the rotating shaft assembly further comprises a housing 9 and a bearing seat 6, a part of the housing 9 is located between the working member 4 and the first liquid cooling ring 57, the housing 9 and the first liquid cooling ring 57 jointly enclose a liquid cooling cavity, the liquid cooling channel 52 of the first liquid cooling ring 57 is communicated with the refrigerant supply mechanism, the bearing 2 is arranged on the bearing seat 6, a first oil supply channel 61 is arranged on the bearing seat 6, the bearing 2 is communicated with the oil supply structure through the first oil supply channel 61, and the liquid cooling channel 52 on the second liquid cooling ring 58 is communicated with the first oil supply channel 61. The low-temperature lubricating oil supplied by the oil supply structure is sent into the rotating shaft assembly through the first oil supply channel 61 and is mainly supplied to the bearing 2 for lubricating and cooling the bearing 2, meanwhile, part of the low-temperature lubricating oil can be conveyed onto the rotating shaft 1 between the working part 4 and the bearing 2 through the liquid cooling channel 52, heat of the rotating shaft 1 is taken away through the low temperature of the low-temperature lubricating oil, heat transferred to the heat insulation structure is reduced, the temperature of the bearing 2 is ensured to be in a preset temperature interval, meanwhile, the first liquid cooling ring 57 is directly fixed on the shell 9, the liquid cooling channel 52 in the first liquid cooling ring 57 is directly communicated with an external refrigerant supply mechanism, and on the premise of ensuring reliable cooling of the rotating shaft, structural contact between the liquid cooling channel 52 and the bearing is avoided, and heat transfer is further reduced. Meanwhile, when the rotating shaft assembly works, the rotating shaft 1 drives the working part 4 to rotate, so that the working part 4 is utilized to apply work to corresponding fluid, in the process, the fluid flowing to the working part 4 and the working part 4 can not only cause the temperature rise of the rotating shaft 1 in the process of rotating to apply work, but also cause the temperature rise of the environment where the rotating shaft assembly is located, that is, the heat at the working part 4 can not only be transmitted through the rotating shaft 1, but also be diffused and transmitted through the environment where the rotating shaft assembly is located, at the moment, a liquid cooling cavity is formed by the shell 9 and the first liquid cooling ring 57 together, so that a cavity for isolating heat can be formed between the working part 4 and the bearing 2, the heat generated at the working part 4 cannot be continuously transmitted to the bearing 2 through the liquid cooling cavity, the temperature rise of the bearing 2 is further avoided, and the working reliability of the bearing 2 is ensured.

Specifically, taking the liquid cooling channel 52 of the first liquid cooling ring 57 and the refrigerant supply mechanism as an example, the liquid cooling channel 52 of the second liquid cooling ring 58 and the oil supply mechanism are communicated, at this time, the refrigerant of the refrigerant supply mechanism can flow to the position of the rotating shaft 1 through the liquid cooling channel 52 of the first liquid cooling ring 57, the refrigerant evaporates into gas to absorb heat to cool the rotating shaft 1, then flows out through the liquid return channel on the first liquid cooling ring 57 to form a refrigerant cooling cycle, the low-temperature lubricating oil of the oil supply mechanism can flow to the position of the rotating shaft 1 through the liquid cooling channel 52 of the second liquid cooling ring 58, the low-temperature lubricating oil absorbs heat to cool the rotating shaft 1, and then flows out through the liquid return channel on the second liquid cooling ring 58 to form a lubricating oil cooling cycle. The refrigerant provided by the refrigerant supply mechanism can be a high-pressure refrigerant of the condenser or a refrigerant subjected to supercooling, and the refrigerant flows back to the inlet side of the evaporator or the impeller through the liquid return channel after being cooled.

The rotating shaft assembly further comprises a positioning shaft shoulder 7 used for positioning the working part 4, the positioning shaft shoulder 7 is sleeved on the rotating shaft 1, the positioning shaft shoulder 7 is located between the working part 4 and the liquid cooling structure 5, namely, the positioning shaft shoulder 7 and the rotating shaft 1 are arranged in a split mode, the position of the working part 4 can be adjusted by replacing the positioning shaft shoulder 7 on the basis of ensuring reliable positioning of the working part 4, the rotating shaft assembly can adapt to different working parts 4 and different working modes, applicability of the rotating shaft assembly is improved, and heat transfer efficiency between the positioning shaft shoulder 7 and the rotating shaft 1 is reduced due to the split arrangement of the positioning shaft shoulder 7 and the rotating shaft 1, at the moment, the heat transfer capacity to the bearing 2 can be reduced by the positioning shaft shoulder 7, the heat transferred to the bearing 2 is further reduced, the temperature rise of the bearing 2 is reduced, and the working reliability of the bearing 2 is ensured. Further, the thermal conductivity of the positioning shoulder 7 is lower than that of the rotating shaft 1. The heat is further reduced and transferred through the positioning shaft shoulder 7, so that the heat transferred to the bearing 2 is reduced, and the working reliability of the bearing 2 is ensured. Preferably, the positioning shaft shoulder 7 is made of stainless steel, and the heat conductivity of the stainless steel is far lower than that of alloy steel of the rotating shaft 1, so that the aim of reducing heat transfer of the positioning shaft shoulder 7 is fulfilled.

The relationship between the width L1 of the positioning shoulder 7 and the diameter D3 of the portion of the rotating shaft 1 on which the positioning shoulder 7 is mounted is: L1/D3 is more than or equal to 0.6 and less than or equal to 0.7. When the width L1 of the positioning shaft shoulder 7 is larger, the length of the rotating shaft 1 needs to be increased at the moment, so that the cantilever length of the rotating shaft assembly is increased, the critical rotation speed of the rotating shaft 1 is reduced, the working reliability and the working efficiency of the rotating shaft assembly are reduced, the space occupation is increased, and when the width of the positioning shaft shoulder 7 is smaller, the structural strength of the positioning shaft shoulder 7 cannot meet the preset requirement, the heat insulation effect of the positioning shaft shoulder 7 is reduced, the heat of the working part 4 is increased through the radiation capability of the positioning shaft shoulder 7, the heat reaching the bearing 2 is still increased, and the working reliability of the bearing 2 is affected. Only when the width L1 of the positioning shoulder 7 is related to the diameter D3 of the portion of the rotating shaft 1 on which the positioning shoulder 7 is mounted is: when L1/D3 is less than or equal to 0.6 and less than or equal to 0.7, the cantilever length of the rotating shaft assembly can be ensured to be in a reasonable range, the critical rotating speed can be reliably improved, meanwhile, the heat insulation efficiency of the positioning shaft shoulder 7 can be effectively optimized, the heat transferred to the bearing 2 is further reduced, the temperature rise of the bearing 2 is reduced, and the working reliability of the bearing 2 is ensured. Preferably, L1 has a value in the range of 52mm to 60mm.

Likewise, the liquid cooling structure 5 and the positioning shaft shoulder 7 have a first avoiding distance, and the cooling medium fed by the liquid cooling structure 5 is enabled to cover the axial length of the rotating shaft 1 as much as possible by using the first avoiding distance, so that the cooling effect on the rotating shaft 1 is improved, the cooling medium can be ensured to smoothly flow to the liquid return channel of the liquid cooling structure 5 to be discharged, and the flow reliability of lubricating oil in the liquid cooling structure 5 is ensured.

The rotating shaft 1 is of a stepped shaft structure, one end of the positioning shaft shoulder 7 is abutted against the working part 4, and the other end of the positioning shaft shoulder is abutted against the corresponding end face of the stepped shaft, so that positioning reliability of the positioning shaft shoulder 7 and the working part 4 is guaranteed, and the positioning shaft shoulder 7 is in interference fit with the rotating shaft 1.

In order to realize the pivoted drive to pivot 1, still need set up structures such as rotor on pivot 1, bearing 2 then need set up and support between rotor and working element 4, and in order to avoid the lubricating oil of bearing 2 department to flow to rotor department, the pivot subassembly still includes fourth seal structure 8, fourth seal structure 8 set up in bearing 2 is kept away from one side of working element 4, fourth seal structure 8 can restrict lubricating oil in bearing 2's installation region, guarantees bearing 2's reliable operation, just bearing 2 with the relation of axial interval L2 between location shoulder 7 with bearing 2 with axial interval L3 between fourth seal structure 8 is: L2/L3 is less than or equal to 1.5 and less than or equal to 2. When the axial distance L2 between the bearing 2 and the positioning shoulder 7 is too small, the heat radiated at the working part 4 is too much, which still causes the problem of temperature rise of the bearing 2, and when the axial distance L2 between the bearing 2 and the positioning shoulder 7 is too large, the problem of increase in the cantilever size of the rotating shaft assembly and reduction in the critical rotation speed is caused; likewise, when the axial distance L3 between the bearing 2 and the fourth sealing structure 8 is too small, the amount of low-temperature lubricating oil that can be stored at the bearing 2 is small, so that the lubrication effect of the bearing 2 is poor, and when the axial distance L3 between the bearing 2 and the fourth sealing structure 8 is too large, the lubricating oil stored at the bearing 2 is too much, the oil return capability is poor, and meanwhile, the cantilever of the rotating shaft assembly is still increased, resulting in a reduction of the critical rotation speed of the rotating shaft assembly, and affecting the working efficiency of the compressor. When the cooling medium in the liquid cooling channel 52 is a refrigerant, the refrigerant can have a higher cooling effect by phase-change gasification, and at this time, L2 can be shorter and can be 40mm to 52mm.

The liquid cooling structure 5 with have the second between the bearing 2 and dodge the interval, equally, when the interval is too little to the second dodge, the quantity of the low temperature lubricating oil that bearing 2 department can be stored is less for the lubrication effect of bearing 2 is bad, and when the interval is too big to the second dodge, the lubricating oil of storage in bearing 2 department is too much, the oil return ability is bad, still can the cantilever increase of pivot subassembly simultaneously, leads to the critical rotation speed reduction of pivot subassembly, influences the work efficiency of compressor.

The first sealing structure 55, the second sealing structure 101, the third sealing structure 102 and the fourth sealing structure 8 are comb tooth sealing structures, so that sealing reliability between the rotating shaft 1 and a corresponding static structure (such as the liquid cooling structure 5) can be ensured, interference between the rotating shaft 1 and the corresponding static structure (such as the liquid cooling structure 5) can be avoided, and working reliability of the rotating shaft assembly is ensured.

In order to further improve the cooling effect on the rotating shaft 1, as shown in fig. 9, a groove structure 71 is formed on the positioning shaft shoulder 7, an opening of the groove structure 71 faces the liquid cooling structure, and the cooling medium can enter and exit the groove structure 71 through the opening. Because the opening of groove structure 71 is towards the liquid cooling structure for the cooling medium that the liquid cooling structure sent into can flow into in groove structure 71 through the opening, cooling medium can increase the area of contact with location shaft shoulder 7 this moment, thereby increase the effect to the heat dissipation of location shaft shoulder 7, the good location shaft shoulder 7 of cooling effect then can be further the heat of absorption pivot 1 simultaneously, the cooling effect to pivot 1 has been improved, the temperature of pivot 1 that the thermal-insulated structure corresponds has further been reduced, and then the heat that reaches bearing 2 department reduces, guarantee bearing 2's operational reliability.

In order to facilitate the flow of the cooling medium in the positioning shoulder 7, the groove structure 71 has an outer side wall 72 remote from the rotating shaft, and an included angle α is formed between the outer side wall 72 and a bottom wall 73 of the groove structure 71, and the included angle α is an obtuse angle. The cooling medium fed by the liquid cooling structure flows to the gap between the rotating shaft and the liquid cooling structure from the liquid cooling outlet and then flows continuously in the axial direction, most of the cooling medium moves to the positioning shaft shoulder 7 due to the first sealing structure 55 between the liquid cooling structure 5 and the bearing 2 and continuously flows to the bottom of the groove structure 71 through the opening and is attached to the inner side wall of the groove structure 71, and when the cooling medium reaches the bottom of the groove structure 71, the cooling medium collides with the bottom wall 73 of the groove structure 71 to turn, at the moment, an obtuse angle included angle alpha is formed between the outer side wall 72 and the bottom wall 73, the cooling medium flows smoothly from the opening along the outer side wall 72, the reliable flow of the cooling medium is ensured, the cooling effect of the cooling medium is prevented from being influenced due to accumulation of the cooling medium in the groove structure 71, and the reliable circulation of the cooling medium and the reliable cooling of the positioning shaft shoulder 7 are ensured. In order to achieve the flow effect of the cooling medium, the angle range of the included angle α is 135 ° to 160 °, an excessively large included angle α affects the structural strength of the positioning shoulder 7, and an excessively small included angle α cannot ensure the flow effect of the cooling medium, and the arrow direction in fig. 9 is the flow path of the cooling medium in the groove structure 71.

The groove structure 71 has an inner sidewall 74 near the rotating shaft, when the end of the heat insulation structure is in clearance fit with the positioning shaft shoulder 7, the cooling medium flowing in the liquid cooling structure will flow along the heat insulation structure at this time, in order to avoid blocking the cooling medium flowing in the groove structure 71 by the groove structure 71, the diameter D4 corresponding to the inner sidewall 74 is smaller than or equal to the outer diameter D5 of the heat insulation structure, that is, in the flowing direction of the cooling medium, the height of the inner sidewall 74 is lower than the height of the heat insulation structure, so that the cooling medium can smoothly flow into the groove structure 71, thereby ensuring the reliable flowing of the cooling medium, avoiding the problem that the cooling effect of the cooling medium is affected due to accumulation of the cooling medium in the groove structure 71, and ensuring the reliable circulation of the cooling medium and the reliable cooling of the positioning shaft shoulder 7. The diameter D4 is a fitting diameter of the ring shape where the inner sidewall 74 is located, corresponding to the central axis of the rotating shaft 1.

The rotating shaft assembly further comprises a thrust disc and thrust bearings, in order to avoid the thrust shaft bearing the influence of the front-end high-temperature air flow, bearings (a main thrust bearing and a rear thrust bearing) on two sides of the thrust disc are arranged at the rear end of the compressor, namely, at the position far away from the working part 4 as far as possible, so that a rear-end double-thrust structure is formed, and the operation reliability of the thrust bearings is improved.

Testing the rotating shaft assembly of the application, processing two groups of temperature measuring holes on a bearing, installing a PT100 temperature measuring device, and monitoring the temperature change of the bearing in the running process of the compressor:

specifically, when the compressor with the rotating shaft assembly is operated at the evaporating temperature of 60 ℃ to 65 ℃ and the condensing temperature of 120 ℃ to 130 ℃, as shown in fig. 10, the two groups of temperatures of the bearing 2 are below 75 ℃, which is far lower than the requirement of the pasteurized alloy allowable temperature 115 ℃ used by the bearing 2, and the change is stable, and the compressor is stable and reliable in operation.

A compressor comprises the rotating shaft assembly. The compressor includes an impeller, which constitutes a working member 4 of the rotary shaft assembly, and compresses gas sucked by the compressor by rotation of the impeller.

The foregoing examples illustrate only a few embodiments of the invention and are described in detail herein without thereby limiting the scope of the invention. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the invention, which are all within the scope of the invention. Accordingly, the scope of protection of the present invention is to be determined by the appended claims.

Claims (26)

1. A spindle assembly, characterized in that: comprising the following steps:

a rotating shaft (1);

the heat insulation structure is sleeved on the rotating shaft (1);

the bearing (2) is sleeved on the heat insulation structure.

2. The spindle assembly of claim 1, wherein: the heat insulation structure comprises at least two heat insulation rings which are coaxially arranged, all the heat insulation rings are sequentially sleeved on the rotating shaft (1), the bearing (2) is sleeved on the heat insulation ring at the outermost side, and the heat conductivity of the heat insulation rings is gradually reduced along the direction from the bearing (2) to the rotating shaft (1).

3. The spindle assembly of claim 2, wherein: the heat insulation ring comprises a vacuum ring (31), wherein the vacuum ring (31) is positioned on the innermost layer of the heat insulation structure, and the vacuum ring (31) is attached to the rotating shaft (1).

4. The spindle assembly of claim 2, wherein: the number of the heat insulation rings is two, the two heat insulation rings comprise vacuum rings (31) and outer heat insulation rings (32), the outer heat insulation rings (32) are sleeved on the vacuum rings (31), and the thickness B1 of the vacuum rings (31) is larger than the thickness B2 of the outer heat insulation rings (32).

5. The spindle assembly of claim 1, wherein: the rotating shaft assembly further comprises a working part (4) and a liquid cooling structure (5), the working part (4) is sleeved on the rotating shaft (1), the working part (4) is located on one side of the bearing (2), the liquid cooling structure (5) surrounds the periphery of the rotating shaft (1), the liquid cooling structure (5) is located between the working part (4) and the bearing (2), and the liquid cooling structure (5) can supply cooling medium for the rotating shaft (1).

6. The spindle assembly of claim 5, wherein: the liquid cooling structure further comprises a liquid cooling ring, the liquid cooling ring surrounds the periphery of the rotating shaft (1), a liquid cooling channel (52) is arranged on the liquid cooling ring, a liquid cooling outlet is formed on the inner wall of the liquid cooling ring through the liquid cooling channel (52), and the liquid cooling channel (52) is communicated with the refrigerant supply mechanism and/or the oil supply structure.

7. The spindle assembly of claim 6, wherein: the rotating shaft assembly further comprises a bearing seat (6), the bearing (2) is arranged on the bearing seat (6), a first oil supply channel (61) is arranged on the bearing seat (6), the bearing (2) is communicated with the oil supply structure through the first oil supply channel (61), and the liquid cooling channel (52) is communicated with the first oil supply channel (61).

8. The spindle assembly of claim 7, wherein: the liquid cooling structure (5) further comprises a communication ring (53), the communication ring (53) surrounds the periphery of the rotating shaft (1), the liquid cooling ring is arranged on the bearing seat (6) through the communication ring (53), a second oil supply channel (51) is formed on the communication ring (53), and the liquid cooling channel (52) is communicated with the first oil supply channel (61) through the second oil supply channel (51).

9. The spindle assembly of claim 8, wherein: the second oil supply channel (51) is provided with a flow regulating mechanism; or, a flow regulating mechanism is arranged on the liquid cooling channel (52); or, a flow rate adjusting mechanism is arranged at the communication position of the second oil supply channel (51) and the liquid cooling channel (52).

10. The spindle assembly of claim 7, wherein: the flow area D2 of the liquid cooling passage (52) is smaller than the flow area D1 of the first oil supply passage (61).

11. The spindle assembly of claim 7, wherein: at least one oil return channel is arranged on the liquid cooling structure (5), and the sum of the flow areas of the oil return channels is larger than the flow area of the liquid cooling channel (52).

12. The spindle assembly of claim 7, wherein: an oil passing gap is formed between the liquid cooling ring and the rotating shaft (1); and/or a first sealing structure (55) is arranged between the part, close to the bearing (2), of the liquid cooling ring and the rotating shaft (1).

13. The spindle assembly of claim 6, wherein: the rotating shaft assembly further comprises a shell (9), part of the shell (9) is located between the working part (4) and the liquid cooling ring, the shell (9) and the liquid cooling ring jointly enclose a liquid cooling cavity, and the liquid cooling channel (52) is communicated with the refrigerant supply mechanism and/or the oil supply structure.

14. The spindle assembly of claim 13, wherein: a second sealing structure (101) is arranged between the shell (9) and the rotating shaft (1), and a third sealing structure (102) is arranged between the part, close to the bearing (2), of the liquid cooling ring and the rotating shaft (1).

15. The spindle assembly of claim 14, wherein: the rotating shaft assembly further comprises a positioning shaft shoulder (7) used for positioning the working part (4), the positioning shaft shoulder (7) is sleeved on the rotating shaft (1), the shell (9), the positioning shaft shoulder (7) and the liquid cooling ring jointly enclose into the liquid cooling cavity, and the second sealing structure (101) is arranged between the shell (9) and the positioning shaft shoulder (7).

16. The spindle assembly of claim 6, wherein: the number of the liquid cooling rings is two, the two liquid cooling rings comprise a first liquid cooling ring (57) and a second liquid cooling ring (58), the first liquid cooling ring (57) and the second liquid cooling ring (58) are both encircling the periphery of the rotating shaft (1), the first liquid cooling ring (57) is arranged between the second liquid cooling ring (58) and the working part (4), the liquid cooling channel (52) on the first liquid cooling ring (57) is communicated with the refrigerant supply mechanism, and the second liquid cooling ring (58) is communicated with the oil supply structure and/or the refrigerant supply mechanism.

17. The spindle assembly of claim 16, wherein: the rotating shaft assembly further comprises a shell (9) and a bearing seat (6), part of the shell (9) is located between the working part (4) and the first liquid cooling ring (57), the shell (9) and the first liquid cooling ring (57) jointly enclose a liquid cooling cavity, the liquid cooling channel (52) of the first liquid cooling ring (57) is communicated with the refrigerant supply mechanism, the bearing (2) is arranged on the bearing seat (6), a first oil supply channel (61) is arranged on the bearing seat (6), the bearing (2) is communicated with the oil supply structure through the first oil supply channel (61), and the liquid cooling channel (52) of the second liquid cooling ring (58) is communicated with the first oil supply channel (61).

18. The spindle assembly of claim 5, wherein: the rotating shaft assembly further comprises a positioning shaft shoulder (7) used for positioning the working part (4), the positioning shaft shoulder (7) is sleeved on the rotating shaft (1), and the positioning shaft shoulder (7) is located between the working part (4) and the liquid cooling structure (5).

19. The spindle assembly of claim 15 or 18, wherein: the thermal conductivity of the positioning shaft shoulder (7) is lower than that of the rotating shaft (1).

20. The spindle assembly of claim 15 or 18, wherein: the relation between the width L1 of the positioning shaft shoulder (7) and the diameter D3 of the rotating shaft (1) part on which the positioning shaft shoulder (7) is mounted is as follows: L1/D3 is more than or equal to 0.6 and less than or equal to 0.7.

21. The spindle assembly of claim 18, wherein: the rotating shaft assembly further comprises a fourth sealing structure (8), the fourth sealing structure (8) is arranged on one side, away from the working part (4), of the bearing (2), and the relation between the axial distance L2 between the bearing (2) and the positioning shaft shoulder (7) and the axial distance L3 between the bearing (2) and the fourth sealing structure (8) is that: L2/L3 is less than or equal to 1.5 and less than or equal to 2.

22. The spindle assembly of claim 15 or 18, wherein: a first avoiding distance is arranged between the liquid cooling structure (5) and the positioning shaft shoulder (7); and/or a second avoiding distance is arranged between the liquid cooling structure (5) and the bearing (2).

23. The spindle assembly of claim 15 or 18, wherein: the positioning shaft shoulder (7) is provided with a groove structure (71), an opening of the groove structure (71) faces the liquid cooling structure, and the cooling medium can enter and flow out of the groove structure (71) through the opening.

24. The spindle assembly of claim 23, wherein: the groove structure (71) is provided with an outer side wall (72) far away from the rotating shaft, an included angle alpha is formed between the outer side wall (72) and the bottom wall (73) of the groove structure (71), and the included angle alpha is an obtuse angle.

25. The spindle assembly of claim 23, wherein: when the end part of the heat insulation structure is in clearance fit with the positioning shaft shoulder (7), the groove structure (71) is provided with an inner side wall (74) close to the rotating shaft, and the diameter D4 corresponding to the inner side wall (74) is smaller than or equal to the outer diameter D5 of the heat insulation structure.

26. A compressor, characterized in that: a spindle assembly comprising any one of claims 1 to 25.