Processing and manufacturing method of air cycle machine shell and air cycle machine

Abstract

The invention provides a machining and manufacturing method of an air cycle machine shell and an air cycle machine. The machining and manufacturing method comprises the steps that a turbine shell and an air compressor shell are fixedly connected into a whole according to the orientation in the using state; the first radial air bearing stator hole section arranged on the turbine shell is opposite to the second radial air bearing stator hole section arranged on the compressor shell; and a boring cutter penetrates from the first radial air bearing stator hole section to the second radial air bearing stator hole section in the axial direction of the first radial air bearing stator hole section, and the boring cutter is controlled to rotate so that the first radial air bearing stator hole section and the second radial air bearing stator hole section can be bored to the design size at a time. The coaxiality of the radial air suspension bearings at the two ends of the rotating shaft in the rotor system is greatly improved, so that the eccentricity of the rotating shaft is reduced, abnormal vibration and instability of the rotor are effectively prevented, and the probability that the air suspension bearings are abraded or damaged due to vibration and instability of the rotating shaft is reduced.

Description

Technical Field

[0001] The invention belongs to the technical field of air conditioning, and in particular relates to a method for processing and manufacturing an air cycle machine shell and an air cycle machine. Background Art

[0002] Air cycle machines are used for compressed air circulation refrigeration. Since conventional roller bearings have large centrifugal forces and require continuous lubrication, and are prone to generate a large amount of frictional heat, air suspension bearings without direct contact have been widely used in air cycle machines. The rotor system of the air cycle machine rotates at high speed under the radial and axial support of the air suspension bearing, but the rotor system has a high speed and therefore has strict requirements on the stability of the rotor system. The failure of the air cycle machine rotor is usually caused by severe wear or damage of the foil of the air suspension bearing. Bearing wear or damage is the direct cause of rotor instability. The factor that has the greatest impact on rotor instability is the misalignment of the radial bearing that matches the rotor when it is working, or the uneven bearing capacity of the bearing increases the eccentricity and causes abnormal vibration of the rotor. Therefore, a high-precision and reliable air suspension bearing support solution is a necessary means to improve the stability of the air cycle machine rotor. Summary of the invention

[0003] Therefore, the present invention provides a processing and manufacturing method for an air cycle machine casing and an air cycle machine, which can overcome the technical problems in the related art that the air suspension radial bearings at both ends of the rotating shaft of the rotor system in the air cycle machine are not centered, the rotating shaft has a large eccentricity, resulting in abnormal vibration or even instability of the rotor, and further causing wear or damage to the air suspension bearings.

[0004] In order to solve the above problems, the present invention provides a method for processing and manufacturing an air cycle machine housing, comprising the following steps:

[0005] A turbine housing for containing a turbine and a compressor housing for containing a compressor wheel and an impeller are fixedly connected as one body according to the orientation in the use state, so that the first radial air bearing stator hole section on the turbine housing and the second radial air bearing stator hole section on the compressor housing are arranged opposite to each other;

[0006] The boring tool is passed through the first radial air bearing stator hole segment to the second radial air bearing stator hole segment along the axial direction of the first radial air bearing stator hole segment, and the boring tool is controlled to rotate to bore the first radial air bearing stator hole segment and the second radial air bearing stator hole segment to the designed size at one time.

[0007] In some embodiments,

[0008] After the first radial air bearing stator hole segment and the second radial air bearing stator hole segment are bored to the designed size, a plurality of foil positioning grooves are processed on the inner walls of the first radial air bearing stator hole segment and the second radial air bearing stator hole segment, and each of the foil positioning grooves passes through both ends of the first radial air bearing stator hole segment and / or the second radial air bearing stator hole segment along the axial direction of the first radial air bearing stator hole segment.

[0009] The present invention further provides an air cycle machine, comprising an air cycle machine housing and a rotor assembly contained in the air cycle machine housing. The air cycle machine housing is formed by processing and assembling using the aforementioned processing and manufacturing method for the air cycle machine housing.

[0010] In some embodiments, the air cycle machine also includes a corrugated foil and a top foil assembled in the first radial air bearing stator hole section and the second radial air bearing stator hole section, wherein after the two end folded edges of the corrugated foil are respectively inserted into the corresponding foil positioning grooves, the connecting end folded edge of the top foil is positioned and inserted into one of the foil positioning grooves and is located radially inside the corrugated foil.

[0011] In some embodiments, the rotor assembly includes the turbine, the compressor wheel and the impeller, the turbine and the compressor wheel are connected as a whole via a first rotating shaft, and the compressor wheel is also connected as a whole with the impeller via a second rotating shaft, the first rotating shaft passes through the central space of the top foil in the first radial air bearing stator hole segment, the second rotating shaft passes through the central space of the top foil in the second radial air bearing stator hole segment, and the length of the first rotating shaft is smaller than the length of the second rotating shaft, and the length of the first radial air bearing stator hole segment is larger than the length of the second radial air bearing stator hole segment.

[0012] In some embodiments, a pressure regulating ring cavity is formed on the end surface of the second radial air bearing stator hole section facing the impeller, the impeller is connected to the first end of the second rotating shaft, and a pressure regulating comb tooth sealing ring is also fixedly connected to the first end of the second rotating shaft, and at least a portion of the pressure regulating comb tooth sealing ring is accommodated in the pressure regulating ring cavity.

[0013] In some embodiments, a first comb-tooth sealing ring is connected to the end face of the second radial air bearing stator hole section facing the compressor wheel, the inner diameter of the first comb-tooth sealing ring is smaller than the diameter of the circle on which the radial outer ends of each foil positioning groove are located, and / or, a retaining ring is connected to the end face of the second radial air bearing stator hole section facing the impeller, the retaining ring is used to limit the axial displacement of one side of the top foil and the wave foil; and / or, a pin is also inserted in the notch on the side of the foil positioning groove on which the connecting end fold is inserted that faces the impeller.

[0014] In some embodiments, the first rotating shaft has a thrust plate extending radially outward, a second comb-tooth sealing ring is connected to the end face of the turbine housing away from the compressor wheel, and an accommodating ring cavity for accommodating the thrust plate is formed between the second comb-tooth sealing ring and the end face of the turbine housing away from the compressor wheel, a first axial air bearing and a second axial air bearing are further provided in the accommodating ring cavity, the first axial air bearing and the second axial air bearing are respectively located on both sides of the thrust plate, and the axial distance between the first axial air bearing and the second axial air bearing and the thrust plate is floatingly adjusted under the action of air pressure.

[0015] In some embodiments, a gap adjustment ring is clamped between the second comb-tooth sealing ring and the end face of the turbine housing away from the compressor wheel; and / or, a plurality of bearing pins parallel to the axial direction of the first rotating shaft are arranged in the accommodating ring cavity, and the two ends of the bearing pins are clamped and fixed by the second comb-tooth sealing ring and the end face of the turbine housing away from the compressor wheel, and the first axial air bearing and the second axial air bearing are slidably sleeved on each of the bearing pins.

[0016] In some embodiments, the first rotating shaft and the second rotating shaft are both hollow cylindrical structures, and the rotor assembly also includes a connecting rod, which sequentially penetrates the turbine, the first rotating shaft, the compressor wheel second rotating shaft and the impeller along the axial direction of the first rotating shaft so that the turbine, the first rotating shaft, the compressor wheel second rotating shaft and the impeller are connected as a whole.

[0017] The present invention provides a method for manufacturing an air cycle machine housing, and an air cycle machine having the following

[0018] Beneficial effects:

[0019] The first radial air bearing stator hole section and the second radial air bearing stator hole section are processed to the design size by a boring tool at one time according to the use state of both the turbine housing and the compressor housing. The coaxiality of the two radial air bearing stator hole sections arranged along the axial direction of the boring tool can be guaranteed during the boring process. The processed first radial air bearing stator hole section and the second radial air bearing stator hole section are directly used as the stator outer rings of the radial air suspension bearings at both ends (that is, the stator outer rings are integrally formed with the corresponding housing instead of being assembled). The processing accuracy is easy to ensure, and the traditional assembly error caused by first machining to form the bearing chamber and then assembling the air suspension bearing stator outer ring separately in the corresponding bearing chamber is eliminated. The coaxiality of the radial air suspension bearings at both ends of the rotating shaft of the rotor system is greatly improved, thereby reducing the eccentricity of the rotating shaft, effectively preventing abnormal vibration and instability of the rotor, and reducing the probability of bearing wear or damage of the air suspension bearing due to vibration and instability of the rotating shaft.

[0020] A plurality of foil positioning grooves are processed on the inner walls of the first radial air bearing stator hole section and the second radial air bearing stator hole section. The foil positioning grooves penetrate the two ends of the corresponding hole section along the axial direction, which can facilitate the assembly of each wave foil and the top foil in the corresponding foil positioning groove; at the same time, the foil positioning grooves are designed as axially penetrating through grooves, which can also reduce the processing difficulty and thus reduce the processing cost;

[0021] Since the axial length of the first rotating shaft is smaller than the axial length of the second rotating shaft, the overall center of mass of the rotor assembly is close to one side of the first rotating shaft. At this time, the axial length of the first radial air bearing stator hole section matched with the first rotating shaft support is designed to be larger than the axial length of the second radial air bearing stator hole section matched with the second rotating shaft support, so that the ratio of the bearing unit area can be the same, thereby significantly improving the bearing tilt;

[0022] The first comb-tooth sealing ring, the second comb-tooth sealing ring and the third comb-tooth sealing ring in the present invention not only realize the airflow sealing but also serve as the axial limiting components of the wave foil and the top foil in the corresponding radial air suspension bearing, thereby simplifying the internal structure of the air cycle machine of the present invention and eliminating the need to separately configure corresponding limiting components at corresponding positions. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the implementation methods of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for the implementation methods or the description of the prior art. The drawings described below are only exemplary, and for ordinary technicians in this field, other implementation drawings can be derived from the provided drawings without creative work.

[0024] Figure 1 is a step diagram of a method for manufacturing an air cycle machine housing in an embodiment of the present invention;

[0025] Figure 2 is a schematic diagram of the three-dimensional structure of an air cycle machine in an embodiment of the present invention;

[0026] Figure 3 yes Figure 2 A cross-sectional view of an air cycle machine at one viewing angle;

[0027] Figure 4 yes Figure 2 A cross-sectional view of the air cycle machine in another perspective;

[0028] Figure 5 yes Figure 4 A partial enlarged view of the middle A;

[0029] Figure 6It is a schematic diagram of the axial state after the top foil wave foil, the top foil and the retaining ring are assembled in the stator hole section of the second radial air bearing in an embodiment of the present invention.

[0030] The accompanying drawings are marked as follows:

[0031] 11. turbine; 12. turbine housing; 121. first radial air bearing stator hole section; 13. first rotating shaft; 131. thrust plate; 14. second comb-tooth sealing ring; 15. clearance adjustment ring; 16. third comb-tooth sealing ring; 21. compressor wheel; 22. impeller; 23. compressor housing; 231. second radial air bearing stator hole section; 232. pressure regulating ring cavity; 24. second rotating shaft; 25. pressure regulating comb-tooth sealing ring; 26. first comb-tooth sealing ring; 27. retaining ring; 28. pin; 31. foil positioning groove; 32. wave foil; 33. top foil; 331. connection end fold; 41. first axial air bearing; 42. second axial air bearing; 43. bearing pin; 5. connecting rod; 6. temperature control housing; T01. turbine housing inlet; T02. turbine housing outlet; C01. compressor housing inlet; C02. compressor housing outlet. DETAILED DESCRIPTION

[0032] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means intended to limit the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0033] In the description of the present invention, it is necessary to understand that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings. They are only for the convenience of describing the present invention and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the devices or elements referred to must have a specific direction or be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of the present invention. The directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.

[0034] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90° or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0035] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. If not otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of the present invention.

[0036] See also Figure 1 and Figure 6 As shown, according to an embodiment of the present invention, a method for processing and manufacturing an air cycle machine casing is provided, comprising the following steps: a turbine casing 12 for accommodating a turbine 11 and a compressor casing 23 for accommodating a compressor wheel 21 and an impeller 22 are fixedly connected as a whole according to the orientation in the use state, so that a first radial air bearing stator hole section 121 on the turbine casing 12 and a second radial air bearing stator hole section 231 on the compressor casing 23 are arranged opposite to each other. It can be understood that the turbine casing 12 and the compressor casing 23 are cast by integral injection molding before performing this step, and the first radial air bearing stator hole section 121 and the second radial air bearing stator hole section 231 are also initially formed in the casting process, but are relatively low in terms of coaxiality and other shape and position accuracy. In this step, the turbine housing 12 and the compressor housing 23 are connected by connecting flanges according to the specific housing structure; the boring tool is passed through the first radial air bearing stator hole segment 121 to the second radial air bearing stator hole segment 231 along the axial direction of the first radial air bearing stator hole segment 121, and the boring tool is controlled to rotate to bore the first radial air bearing stator hole segment 121 and the second radial air bearing stator hole segment 231 to the designed size at one time. The above-mentioned design size specifically includes the aperture of the first radial air bearing stator hole segment 121 and the second radial air bearing stator hole segment 231 on both sides and the coaxiality and position between the two holes. The above-mentioned one-time means that the two stator hole segments at the axial ends of the boring tool are bored into place in one processing process.

[0037] In this technical solution, the first radial air bearing stator hole segment 121 and the second radial air bearing stator hole segment 231 are processed to the design size by a boring tool at one time according to the use state of the turbine housing 12 and the compressor housing 23. The coaxiality of the two radial air bearing stator hole segments spaced along the axial direction of the boring tool can be guaranteed during the boring process. The processed first radial air bearing stator hole segment 121 and the second radial air bearing stator hole segment 231 are directly used as the stator outer rings of the radial air suspension bearings at both ends (that is, the stator outer rings are integrally formed with the corresponding housing instead of being assembled). The processing accuracy is easy to ensure, and the traditional assembly error caused by first processing to form a bearing chamber and then assembling the air suspension bearing stator outer ring separately in the corresponding bearing chamber is eliminated. The coaxiality of the radial air suspension bearings at both ends of the rotating shaft of the rotor system is greatly improved, thereby reducing the eccentricity of the rotating shaft, effectively preventing abnormal vibration and instability of the rotor, and reducing the probability of bearing wear or damage of the air suspension bearing due to vibration and instability of the rotating shaft.

[0038] In some embodiments, after the first radial air bearing stator hole segment 121 and the second radial air bearing stator hole segment 231 are bored to the designed size, a plurality of foil positioning grooves 31 are processed on the inner walls of the first radial air bearing stator hole segment 121 and the second radial air bearing stator hole segment 231, and each of the foil positioning grooves 31 passes through both ends of the first radial air bearing stator hole segment 121 and / or the second radial air bearing stator hole segment 231 along the axial direction of the first radial air bearing stator hole segment 121. The aforementioned foil positioning grooves 31 can be specifically formed by wire cutting.

[0039] In this technical solution, a plurality of foil positioning grooves 31 are processed on the inner walls of the first radial air bearing stator hole segment 121 and the second radial air bearing stator hole segment 231. The foil positioning grooves 31 axially penetrate the two ends of the corresponding hole segments, which can facilitate the assembly of each wave foil 32 and the top foil 33 in the corresponding foil positioning groove 31. At the same time, the foil positioning grooves 31 are designed as axially penetrating through grooves, which can also reduce the processing difficulty and thus reduce the processing cost.

[0040] According to an embodiment of the present invention, an air cycle machine is further provided, comprising an air cycle machine housing and a rotor assembly contained in the air cycle machine housing, wherein the air cycle machine housing is formed by processing and assembling using the aforementioned processing and manufacturing method for the air cycle machine housing. In some embodiments, the air cycle machine further comprises a bump foil 32 and a top foil 33 assembled in the first radial air bearing stator hole section 121 and the second radial air bearing stator hole section 231, wherein after the two end folds of the bump foil 32 are respectively inserted into the corresponding foil positioning grooves 31, the connection end fold 331 of the top foil 33 is positioned and inserted into one of the foil positioning grooves 31 and is located radially inside the bump foil 32.

[0041] In this technical solution, by inserting the two end folded edges of the bump foil 32 into the foil positioning grooves 31 and positioning the connecting end folded edges 331 of the top foil 33 into the corresponding foil positioning grooves 31, reliable stability of the positions of the bump foil 32 and the top foil 33 can be achieved.

[0042] In some embodiments, the rotor assembly includes the turbine 11, the compressor wheel 21 and the impeller 22, the turbine 11 and the compressor wheel 21 are connected as a whole via a first rotating shaft 13, and the compressor wheel 21 is also connected as a whole with the impeller 22 via a second rotating shaft 24, the first rotating shaft 13 passes through the central space of the top foil 33 in the first radial air bearing stator hole segment 121 (that is, the rotor suspension area), the second rotating shaft 24 passes through the central space of the top foil 33 in the second radial air bearing stator hole segment 231 (that is, the rotor suspension area), and the length of the first rotating shaft 13 is less than the length of the second rotating shaft 24, and the length of the first radial air bearing stator hole segment 121 is greater than the length of the second radial air bearing stator hole segment 231.

[0043] In this technical solution, since the axial length of the first rotating shaft 13 is smaller than the axial length of the second rotating shaft 24, the overall center of mass of the rotor assembly is close to one side of the first rotating shaft 13. At this time, the axial length of the first radial air bearing stator hole section 121 supported and matched with the first rotating shaft 13 is designed to be larger than the axial length of the second radial air bearing stator hole section 231 supported and matched with the second rotating shaft 24, so that the ratio of the bearing unit area can be the same, thereby significantly improving the bearing inclination.

[0044] See Figure 3As shown, in some embodiments, a pressure regulating ring cavity 232 is formed on the end face of the second radial air bearing stator hole section 231 facing the impeller 22, and the impeller 22 is connected to the first end of the second rotating shaft 24. A pressure regulating comb tooth sealing ring 25 is also fixedly connected to the first end of the second rotating shaft 24, and at least a portion of the pressure regulating comb tooth sealing ring 25 is accommodated in the pressure regulating ring cavity 232, and a pressure regulating flow gap is formed between the outer ring comb teeth of the pressure regulating comb tooth sealing ring 25 and the pressure regulating ring cavity 232.

[0045] In this technical solution, the pressure regulating comb tooth sealing ring 25 is fixedly connected to the second rotating shaft 24, that is, when the second rotating shaft 24 rotates, the pressure regulating comb tooth sealing ring 25 also rotates synchronously therewith. The left annular surface of the pressure regulating comb tooth seal 25 in the pressure regulating ring cavity is the load surface. The air pressure higher than the atmospheric pressure in the pressure regulating ring cavity 232 acts on the load surface. Compared with the atmospheric pressure on the outside of the pressure regulating comb tooth seal 25, a pressure difference will be generated at both axial ends of the pressure regulating comb tooth sealing ring 25. The pressure difference will balance the axial force of the rotating shaft to reduce the load force of the first axial air bearing 41 and the second axial air bearing 42, thereby ensuring the stability of the axial position of the rotating shaft.

[0046] In some embodiments, a first comb-tooth sealing ring 26 is connected to the end face of the second radial air bearing stator hole section 231 facing the compressor wheel 21, and the inner diameter of the first comb-tooth sealing ring 26 is smaller than the diameter of the circle where the radial outer end of each foil positioning groove 31 is located. In this way, the first comb-tooth sealing ring 26 can not only effectively reduce the leakage of the high-pressure airflow generated by the compressor wheel 21 at its setting position, but also form a blockage on one side end of the through foil positioning groove 31, thereby preventing the wave foil 32 and the top foil 33 from escaping from the slot position.

[0047] Due to the arrangement of the aforementioned pressure regulating ring cavity 232, the notch of the foil positioning groove 31 facing the impeller 22 lacks the necessary limiting structure. In a preferred embodiment, a retaining ring 27 is connected to the end surface of the second radial air bearing stator hole section 231 facing the impeller 22, and the retaining ring 27 is used to limit the axial displacement of one side of the top foil 33 and the wave foil 32. The retaining ring 27 is specifically bolted to the concave end surface of the compressor housing 23 corresponding to the aforementioned pressure regulating ring cavity 232.

[0048] In another preferred embodiment, a pin 28 is also inserted into the slot on the side of the foil positioning slot 31 facing the impeller 22 in which the connecting end folded edge 331 is inserted. The pin 28 fixes the corresponding folded edges of the top foil 33 and the wave foil 32 in the foil positioning slot 31 by interference fit.

[0049] In some embodiments, the first rotating shaft 13 has a thrust plate 131 extending radially outward, and a second comb-tooth sealing ring 14 is connected to the end surface of the turbine housing 12 away from the compressor wheel 21, and an accommodating annular cavity (not marked in the figure) for accommodating the thrust plate 131 is formed between the second comb-tooth sealing ring 14 and the end surface of the turbine housing 12 away from the compressor wheel 21, and a first axial air bearing 41 and a second axial air bearing 42 are also provided in the accommodating annular cavity, and the first axial air bearing 41 and the second axial air bearing 42 are respectively located on both sides of the thrust plate 131, and the axial distance between the first axial air bearing 41 and the second axial air bearing 42 and the thrust plate 131 is floatingly adjusted under the action of air pressure.

[0050] In this technical solution, the axial position of the rotating shaft is limited by the thrust plate 131 , the first axial air bearing 41 and the second axial air bearing 42 .

[0051] In some embodiments, a gap adjustment ring 15 is clamped between the second comb-teeth sealing ring 14 and an end surface of the turbine housing 12 on a side away from the compressor wheel 21 .

[0052] In this technical solution, according to the actual application conditions, the clearance adjustment ring 15 with different axial thicknesses can be selected to meet different axial air suspension positioning requirements.

[0053] A plurality of bearing pins 43 parallel to the axial direction of the first rotating shaft 13 are arranged in the accommodating annular cavity, and the two ends of the bearing pins 43 are clamped and fixed by the second comb tooth sealing ring 14 and the end surface of the turbine housing 12 away from the compressor wheel 21, and the first axial air bearing 41 and the second axial air bearing 42 are slidably sleeved on each of the bearing pins 43, thereby realizing the floating adjustment of the axial position of the first axial air bearing 41 and the second axial air bearing 42.

[0054] See Figure 3 As shown, it also includes a third comb-tooth sealing ring 16 connected to the turbine housing 12 on the side close to the compressor wheel 21. The second axial air bearing 42 and the third comb-tooth sealing ring 16 are respectively located at the axial ends of the first radial air bearing stator hole section 121, thereby respectively forming a blockage of the two end notches of each foil positioning groove 31 on the first radial air bearing stator hole section 121, thereby realizing the axial positioning of each wave foil 32 and top foil 33 assembled thereon.

[0055] The aforementioned first comb-tooth sealing ring 26, the second comb-tooth sealing ring 14 and the third comb-tooth sealing ring 16 are roughly similar in structure, and are all fixedly connected to the corresponding housing and arranged around the radial outer side of the rotating shaft, so as to utilize the comb teeth on the radial inner wall of each sealing ring to achieve sealing and leakage prevention of the airflow. It is worth emphasizing that, unlike the functions of traditional comb-tooth sealing rings, the first comb-tooth sealing ring 26, the second comb-tooth sealing ring 14 and the third comb-tooth sealing ring 16 in the present invention not only achieve airflow sealing, but also serve as axial limiting components of the wave foil 32 and the top foil 33 in the corresponding radial air suspension bearing, thereby simplifying the internal structure of the air cycle machine of the present invention, and there is no need to separately configure corresponding limiting components at corresponding positions.

[0056] In some embodiments, the first rotating shaft 13 and the second rotating shaft 24 are both hollow cylindrical structures, and the rotor assembly also includes a connecting rod 5, which sequentially penetrates the turbine 11, the first rotating shaft 13, the compressor wheel 21, the second rotating shaft 24 and the impeller 22 along the axial direction of the first rotating shaft 13 so that the turbine 11, the first rotating shaft 13, the compressor wheel 21, the second rotating shaft 24 and the impeller 22 are connected as a whole, and the structural connection is reliable and stable.

[0057] In addition, the first rotating shaft 13 and the second rotating shaft 24 of the hollow cylindrical structure can also allow the interior thereof to serve as a circulation channel for cooling airflow. At this time, corresponding through holes are provided at positions of the first rotating shaft 13 and the second rotating shaft 24 corresponding to the aforementioned axial air suspension bearing and radial air suspension bearing, respectively, so as to cool the aforementioned axial air suspension bearing and radial air suspension bearing.

[0058] In another preferred embodiment, a temperature control housing 6 is further connected to the outlet side of the turbine housing 12 .

[0059] It is easy for those skilled in the art to understand that, without conflict, the advantageous technical features of the above-mentioned methods can be freely combined and superimposed.

[0060] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention shall be included in the protection scope of the present invention. The above description is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and variations can be made without departing from the technical principles of the present invention. These improvements and variations should also be regarded as the protection scope of the present invention.

Claims

1. A method for manufacturing an air cycle machine housing, characterized in that: The steps include: A turbine housing (12) for containing a turbine (11) and a compressor housing (23) for containing a compressor wheel (21) and an impeller (22) are fixedly connected as a whole according to the orientation in a use state, so that a first radial air bearing stator hole section (121) on the turbine housing (12) and a second radial air bearing stator hole section (231) on the compressor housing (23) are arranged opposite to each other; A boring tool is passed through the first radial air bearing stator hole segment (121) along the axial direction of the first radial air bearing stator hole segment (121) from the first radial air bearing stator hole segment (121) to the second radial air bearing stator hole segment (231), and the boring tool is controlled to rotate so as to bore the first radial air bearing stator hole segment (121) and the second radial air bearing stator hole segment (231) to the designed size at one time.

2. The manufacturing method according to claim 1, characterized in that: After the first radial air bearing stator hole section (121) and the second radial air bearing stator hole section (231) are bored to the designed size, a plurality of foil positioning grooves (31) are processed on the inner walls of the first radial air bearing stator hole section (121) and the second radial air bearing stator hole section (231), and each of the foil positioning grooves (31) passes through both ends of the first radial air bearing stator hole section (121) and / or the second radial air bearing stator hole section (231) along the axial direction of the first radial air bearing stator hole section (121).

3. An air cycle machine, comprising an air cycle machine housing and a rotor assembly contained in the air cycle machine housing, characterized in that: The air cycle machine housing is formed by processing and assembling the air cycle machine housing by the processing and manufacturing method of claim 2.

4. The air cycle machine according to claim 3, characterized in that: It also includes a corrugated foil (32) and a top foil (33) assembled in the first radial air bearing stator hole section (121) and the second radial air bearing stator hole section (231), wherein after the two end folded edges of the corrugated foil (32) are respectively inserted into the corresponding foil positioning grooves (31), the connecting end folded edge (331) of the top foil (33) is positioned and inserted into one of the foil positioning grooves (31) and is located radially inside the corrugated foil (32).

5. The air cycle machine according to claim 4, characterized in that: The rotor assembly comprises a turbine (11), a compressor wheel (21) and an impeller (22); the turbine (11) and the compressor wheel (21) are connected as a whole via a first rotating shaft (13); the compressor wheel (21) and the impeller (22) are also connected as a whole via a second rotating shaft (24); the first rotating shaft (13) passes through the central space of the top foil (33) in the first radial air bearing stator hole section (121); the second rotating shaft (24) passes through the central space of the top foil (33) in the second radial air bearing stator hole section (231); the length of the first rotating shaft (13) is smaller than the length of the second rotating shaft (24); the length of the first radial air bearing stator hole section (121) is larger than the length of the second radial air bearing stator hole section (231).

6. The air cycle machine according to claim 5, characterized in that: A pressure regulating ring cavity (232) is formed on the end surface of the second radial air bearing stator hole section (231) facing the impeller (22); the impeller (22) is connected to the first end of the second rotating shaft (24); a pressure regulating comb teeth sealing ring (25) is also fixedly connected to the first end of the second rotating shaft (24); and at least a portion of the pressure regulating comb teeth sealing ring (25) is accommodated in the pressure regulating ring cavity (232).

7. The air cycle machine according to claim 6, characterized in that: A first comb-tooth sealing ring (26) is connected to the end surface of the second radial air bearing stator hole section (231) on one side facing the compressor wheel (21), and the inner diameter of the first comb-tooth sealing ring (26) is smaller than the diameter of the circle where the radial outer ends of each foil positioning groove (31) are located; and / or, a retaining ring (27) is connected to the end surface of the second radial air bearing stator hole section (231) on one side facing the impeller (22), and the retaining ring (27) is used to limit the axial displacement of one side of the top foil (33) and the wave foil (32); and / or, a pin (28) is also inserted into the notch on one side of the foil positioning groove (31) where the connecting end fold (331) is inserted, facing the impeller (22).

8. The air cycle machine according to claim 5, characterized in that: The first rotating shaft (13) is provided with a thrust plate (131) extending radially outwardly therefrom; a second comb-tooth seal ring (14) is connected to an end surface of the turbine housing (12) away from the compressor wheel (21); and an accommodating ring cavity for accommodating the thrust plate (131) is formed between the second comb-tooth seal ring (14) and the end surface of the turbine housing (12) away from the compressor wheel (21); a first axial air bearing (41) and a second axial air bearing (42) are also provided in the accommodating ring cavity; the first axial air bearing (41) and the second axial air bearing (42) are respectively located on both sides of the thrust plate (131), and the axial spacing between the first axial air bearing (41) and the second axial air bearing (42) and the thrust plate (131) is adjusted by floating under the action of air pressure.

9. The air cycle machine according to claim 8, characterized in that: A clearance adjustment ring (15) is clamped between the second comb-tooth seal ring (14) and the end surface of the turbine housing (12) away from the compressor wheel (21); and / or, a plurality of bearing pins (43) parallel to the axial direction of the first rotating shaft (13) are arranged in the accommodating ring cavity, and the two ends of the bearing pins (43) are clamped and fixed by the second comb-tooth seal ring (14) and the end surface of the turbine housing (12) away from the compressor wheel (21), and the first axial air bearing (41) and the second axial air bearing (42) are slidably sleeved on each of the bearing pins (43).

10. The air cycle machine according to claim 5, characterized in that: The first rotating shaft (13) and the second rotating shaft (24) are both hollow cylindrical structures. The rotor assembly also includes a connecting rod (5). The connecting rod (5) passes through the turbine (11), the first rotating shaft (13), the compressor wheel (21), the second rotating shaft (24) and the impeller (22) in sequence along the axial direction of the first rotating shaft (13) so that the turbine (11), the first rotating shaft (13), the compressor wheel (21), the second rotating shaft (24) and the impeller (22) are connected as a whole.

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