Capped multistage turbine air motor

Abstract

A kind of crown multistage turbine air motor, including shell, air inlet end cover, exhaust end cover, the output shaft being rotatably supported by air inlet end cover and exhaust end cover, stator impeller and rotor impeller with interval being alternately arranged on output shaft;The inner surface of stator impeller is connected with bearing on output shaft, and its outer surface moves synchronously with shell;Rotor impeller is fixedly connected with output shaft;The two ends of stator impeller are axially positioned by the shaft shoulder of output shaft or sleeve on output shaft;Shell includes two semicircular semicircular shells, and the two ends of semicircular shell are respectively connected with air inlet end cover and exhaust end cover by mortise and tenon connection.The application is divided into two along the axial direction of shell, and is designed as split structure, and the two semicircular shells are connected by mortise and tenon connection to realize the connection with air inlet end cover and exhaust end cover.It can realize the convenient disassembly of stator impeller and rotor impeller, and also solves the sealing problem of split shell and air inlet end cover and exhaust end cover.

Description

Technical Field

[0001] This invention relates to the field of air motor technology, and in particular to a crowned multi-stage turbine air motor. Background Technology

[0002] Existing air motors are large in size and have low power, making them unsuitable for use in small pneumatic equipment. Currently, the turbine air motors used in China employ a multi-stage turbine drive system, replacing the traditional single-turbine drive, resulting in a significant improvement in efficiency.

[0003] In the existing technology, multi-stage turbine blades are manufactured as a whole. If a small number of blades are damaged, it is not easy to replace the new parts of a specific turbine stage so that the device can continue to be used.

[0004] To address this issue, we propose a high-efficiency crowned multi-stage turbine air motor device to solve the problem of difficulty in replacing a particular turbine stage in the existing technology. Summary of the Invention

[0005] The purpose of this invention is to provide a multi-stage turbine air motor that allows for easy replacement of a single stage turbine.

[0006] To achieve the above objectives, the present invention provides the following technical solution:

[0007] A crowned multi-stage turbine air motor includes a housing, an inlet end cover, an exhaust end cover, an output shaft rotatably supported by the inlet end cover and the exhaust end cover, and stator impellers and rotor impellers alternately arranged on the output shaft.

[0008] The inner surface of the stator impeller is connected to the bearing sleeved on the output shaft, and its outer surface moves synchronously with the housing.

[0009] The rotor impeller is fixedly connected to the output shaft by a key;

[0010] The two ends of the stator impeller are axially positioned by the shoulder of the output shaft or by the sleeve fitted on the output shaft, so that adjacent stator impellers and rotor impellers are arranged at intervals.

[0011] The stator impeller and the rotor impeller are respectively sealed to the housing;

[0012] The housing includes two semi-circular shells, the two ends of which are respectively connected to the air intake end cap and the exhaust end cap by tenon joints.

[0013] Furthermore, the two ends of the housing are respectively provided with an air inlet groove and an exhaust groove;

[0014] The end of the air intake cap is provided with an air intake tenon, which includes an air intake groove and an air intake protrusion. The shape of the air intake groove matches that of the air intake tenon to fasten to the outside of the air intake tenon.

[0015] The exhaust end cap is provided with an exhaust tenon, which includes an exhaust groove and an exhaust protrusion. The exhaust groove matches the shape of the exhaust tenon to be fastened to the outside of the exhaust tenon.

[0016] Furthermore, the stator impeller includes a stator body, multiple stator blades, and annular stator blade crowns;

[0017] The first stator impeller near the air inlet end cover is configured as the first stage stator impeller. A conical diversion protrusion is fixed on the stator body of the first stage stator impeller. The diversion protrusion allows the gas flowing in from the air inlet end cover to enter the next rotor impeller along the inner surface of the housing.

[0018] The first-stage stator impeller is fitted inside the air inlet end cover, and the air inlet end cover is provided with a stepped surface that restricts the movement of the stator blade crown of the first-stage stator impeller;

[0019] The diverter protrusion has a blind hole, which is fitted onto the air inlet end of the output shaft;

[0020] Two positioning protrusions are fixed on the outer surface of all stator blades, and the corresponding position of the air inlet end cover or each semi-circular shell is provided with a positioning groove into which the positioning protrusions extend.

[0021] The outer surface of the stator blade crown is provided with a stator sealing groove to accommodate the sealing ring, so that the stator blade crown is sealed to the inner surface of the air inlet end cover or the housing corresponding to the position.

[0022] Furthermore, the stator impellers other than the first-stage stator impeller are connected to the housing via two sealing rings;

[0023] The remaining two positioning protrusions of the stator impeller are located between the two sealing rings.

[0024] Furthermore, the rotor impeller includes a rotor body, multiple rotor blades, and an annular rotor blade crown;

[0025] The inner surface of the housing has three rings of housing protrusions, and the outer surface of the rotor blade crown has two rings of sealing protrusions, with each sealing protrusion placed in a groove formed by adjacent housing protrusions.

[0026] The housing protrusions and the sealing protrusions are arranged alternately to form a sealing grate structure to achieve a sealed connection between the rotor impeller and the housing.

[0027] Furthermore, the stator blades and rotor blades are arranged in an alternating pattern;

[0028] In the direction of air intake, the number of blades in the stator impeller and the rotor impeller decreases sequentially, while the spacing between the blades increases sequentially.

[0029] Furthermore, the stator blades and rotor blades have the same root height, and the heights of the tops of the rotor blades and stator blades increase sequentially in the air intake direction.

[0030] The crowned multi-stage turbine air motor provided by the present invention, as described above, has the following beneficial effects:

[0031] The stepped output shaft divides all the multi-stage turbines into independent individual structures mounted on the output shaft. This invention also features a split housing structure, allowing for timely replacement of damaged components and reducing costs. This invention departs from the existing integrated stator and rotor impeller structure, allowing for convenient and timely replacement of damaged stator and rotor impeller parts, resulting in a longer lifespan and reduced vibration. Attached Figure Description

[0032] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this invention. For those skilled in the art, other drawings can be obtained based on these drawings.

[0033] Figure 1 This is a schematic diagram of the external structure of the multi-stage turbine air motor disclosed in this invention;

[0034] Figure 2 This is a cross-sectional structural schematic diagram of the multi-stage turbine air motor disclosed in this invention;

[0035] Figure 3 This is a schematic diagram of the semi-circular shell structure disclosed in this invention;

[0036] Figure 4 This is a schematic diagram of the internal structure of the multi-stage turbine air motor disclosed in this invention;

[0037] Figure 5 This is a schematic diagram of the structure of the air intake end cap disclosed in this invention;

[0038] Figure 6 This is a schematic diagram of the structure of the output shaft disclosed in this invention;

[0039] Figure 7 This is a schematic diagram of the assembly structure of the air intake end cover and the first-stage stator impeller disclosed in this invention;

[0040] Figure 8 This is a schematic diagram of the structure of the first-stage stator impeller disclosed in this invention;

[0041] Figure 9 This is a schematic diagram of the stator impeller disclosed in this invention;

[0042] Figure 10 This is a schematic diagram of the rotor impeller disclosed in this invention;

[0043] Figure 11 This is a schematic diagram of the semi-circular shell structure disclosed in this invention.

[0044] Reference numerals: 1. Housing; 101. Positioning groove; 102. Housing protrusion; 103. Bolt boss; 2. Inlet end cover; 21. Stepped surface; 201. Inlet groove; 202. Inlet protrusion; 2011. Front end face; 2022. Rear end face; 3. Exhaust end cover; 301. Exhaust groove; 302. Arc groove; 32. Output shaft; 4. Sleeve; 41. Shoulder; 42. Stator impeller; 5. Stator blade; 51. Stator blade crown; 52. Positioning protrusion; 521. Blade gap; 522. Stator sealing groove; 523. Diverter protrusion; 53. Bearing positioning boss; 531. Rotor impeller; 6. Rotor blade; 61. Rotor blade crown; 62. Sealing protrusion; 621. Rolling bearing; 7. Detailed Implementation

[0045] To enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings.

[0046] See Figure 1-11 The illustrated multi-stage turbine air motor with a crown includes a housing 1, an inlet end cover 2, an exhaust end cover 3, an output shaft 4 rotatably supported by the inlet end cover 2 and the exhaust end cover 3, and stator impellers 5 and rotor impellers 6 alternately arranged on the output shaft 4. The alternation is in the order of stator impellers 5, rotor impellers 6, stator impellers 5 again, and rotor impellers 6 again along the air intake direction.

[0047] For ease of explanation, this article schematically designates the end where air enters the casing as the front and the end where air exits the casing as the rear.

[0048] The housing 1 is a split structure, longitudinally divided into two semi-circular shells with semi-circular cross-sections. The two ends of each semi-circular shell are connected to the intake end cap 2 and the exhaust end cap 3 via tenon joints. The semi-circular shells are as follows... Figure 3 As shown, bolt bosses 103 for mounting bolts are provided on the outer surface of the semi-circular shell. Two bolt bosses 103 are passed through by bolts to achieve circumferential fastening of the two semi-circular shells. More preferably, as shown... Figure 11As shown, the circumferential end faces of the semicircular shells are designed in a stepped shape, with two right-angle turns in the shape of the end faces. The circumferential end faces of the two semicircular shells can be spliced ​​together to achieve a sealed connection between the two semicircular shells. The connection method of the two semicircular shells can be referred to in the field of sealing connections, and will not be elaborated here.

[0049] Among them, the air intake end cover 2, as Figure 5 As shown, the whole structure is circular.

[0050] The exhaust end cover 3 is a circular plate structure with three arc-shaped slots 32 running through its thickness to discharge the expanded gas. The two ends of the semi-circular shell are respectively connected to the intake end cover 2 and the exhaust end cover 3 by tenon and groove joints, so that the contact points of the shell 1, the intake end cover 2 and the exhaust end cover 3 form a sealed connection.

[0051] An output shaft 4, axially fixed and rotatable relative to the housing 1, is located at the center line inside the housing 1. The output shaft 4 is made into a stepped shaft to position the stator impeller 5. A bearing is fitted around the exhaust end cover 3 to rotatably support the output shaft 4. One end of the output shaft 4 passing through the exhaust end cover 3 is a D-shaped shaft section, which facilitates connection with an external gear using a set screw.

[0052] The rotor impeller 6 is fixedly connected to the output shaft 4 by a key.

[0053] In this multi-stage turbine air motor, the inner surface of the stator impeller 5 is connected to the output shaft 4 by a bearing, and the outer surface of the stator impeller 5 moves synchronously with the housing 1. Adjacent stator impellers 5 and rotor impellers 6 are arranged at intervals. Since the axial position of the rotor impeller 6 is fixed, a sleeve 41 can be fitted onto the output shaft 4. The sleeve 41 is clamped between one end of the rotor impeller 6 and the stator impeller 5, and the other end of the stator impeller 5 is positioned by a shoulder, achieving an interval arrangement between the stator impeller 5 and the rotor impeller 6. Preferably, the inner ring of the bearing fitted inside the stator impeller 5 contacts the sleeve 41. Alternatively, a shoulder 42 can be designed on the output shaft 4 to position the inner ring of the bearing fitted inside the stator impeller 5. This multi-stage turbine air motor has an axially rotatable output shaft, and the multi-stage stator impellers 5 and rotor impellers 6 are all installed as independent units on the output shaft, cooperating with the split-structure housing. This allows for timely replacement of damaged parts in case of internal motor failure, reducing costs. Both ends of the stator impeller 5 can be positioned by sleeves 41 or by shoulders, but it is preferred that they are positioned by one shoulder and one sleeve. The sleeve or shoulder is mainly used to separate the stator impeller 5 and the rotor impeller 6 before mounting them onto the output shaft, rather than machining the stator impeller 5 and the rotor impeller 6 into one piece. Using sleeves or shoulders to position parts on the shaft is existing technology and will not be described in detail here.

[0054] A stator impeller 5 and a rotor impeller 6 with multi-stage turbine blades are disposed between the output shaft 4 and the inner wall and inner surface of the housing 1. They are axially spaced on the output shaft 4, and the axial positioning of the turbine blades of different stages is accomplished using the shaft shoulder 42 and sleeve 41 of the output shaft. The stator impeller 5 is located at the foremost end of the output shaft, near the air inlet, while the rotor impeller 6 is located at the rear. Compressed gas entering from the exhaust end cover passes through the blade gaps 522 of the stator impeller 5, and the gas changes direction and expands as it flows into the blade gaps of the rotor impeller 6. Three arc-shaped slots 32 are evenly distributed on the circumferential surface of the exhaust end cover 3 to discharge the expanded gas.

[0055] Specifically, the preferred technical solution for connecting the two ends of the semi-circular shell to the air intake end cap 2 and the exhaust end cap 3 with tenons and grooves is that the two ends of the shell 1 are respectively provided with an air intake groove and an exhaust groove.

[0056] The end of the air intake cover 2 is provided with an air intake tenon. The air intake tenon, from front to back, includes a ring of air intake grooves 201 and a ring of air intake protrusions 202. The shape of the air intake groove matches the shape of the air intake tenon for fastening and fitting onto the outside of the air intake tenon. On the inner surface of the semi-circular shell, the air intake groove has a ring of protrusions extending into the air intake groove 201 and a ring of grooves accommodating the air intake protrusion 202, designed sequentially from front to back. The air intake tenon and the exhaust groove are respectively a 90° upward-folded hook structure and a 90° downward-folded hook structure, allowing them to hook together in the front-rear direction. The front end face 2011 of the air intake groove 201 contacts the front end face of the semi-circular shell, i.e., the front end face of the air intake groove, while the rear end face 2022 of the air intake protrusion 202 contacts the semi-circular shell axially. This achieves a seamless axial splicing of the air intake tenon and the air intake groove, facilitating sealing.

[0057] The exhaust end cap 3 has an exhaust tenon at its end. The exhaust tenon, from back to front, includes a ring of exhaust grooves 301 and a ring of exhaust protrusions 302. The exhaust grooves match the shape of the exhaust tenon to engage and fit onto the outside of the exhaust tenon. The operating principle of the exhaust grooves and exhaust tenons is the same as that of the intake tenons and intake grooves. The exhaust groove is a downward-curving hook structure, and the exhaust tenon has an upward-curving hook structure; the two can seamlessly engage in the front-to-back direction. Specifically, the exhaust groove has a ring of grooves accommodating the exhaust protrusions 302 and a ring of protrusions extending into the exhaust grooves 301, designed sequentially from front to back on the inner surface of the semi-circular shell.

[0058] Preferably, the stator impeller 5 includes a stator body, a plurality of stator blades 51 and an annular stator blade crown 52;

[0059] The first stator impeller 5 near the inlet end cover 2 is set as the first-stage stator impeller. A conical diversion protrusion 53 is fixed on the front end face of the stator body of the first-stage stator impeller. The diversion protrusion 53 is thin at the front end and thick at the rear end. The diversion protrusion 53 allows the gas flowing in from the inlet end cover 2 to enter the next rotor impeller 6 along the inner surface of the housing 1.

[0060] The first-stage stator impeller is fitted inside the inlet end cover 2, which has a stepped surface 21 that restricts the forward movement of the first-stage stator impeller. The rear end face of the flow divider protrusion 53 has a blind hole that fits over the inlet end of the output shaft 4. Thus, the axial direction of the first-stage stator impeller is fixed by the stepped surface 21 and the output shaft 4. The output shaft 4 and the stator body of the first-stage stator impeller are connected by bearings.

[0061] The first-stage stator impeller has a flow-diverting protrusion 53 near the inlet end cover, which changes the gas flow direction, redirecting the compressed gas flow path to enter the first-stage rotor blades along the inner wall of the housing 1. The inner surface of the stator body of the first-stage stator impeller is connected to a rolling bearing 7. A second blind hole is provided on the rear end face of the flow-diverting protrusion 53 to house the rolling bearing 7. The inner ring of the bearing is assembled with the output shaft 4, and the outer ring of the bearing rests against the bearing positioning boss 531 in the second blind hole. Two axially symmetrical positioning protrusions 521 are provided on the outer surface of the stator blade crown of the first-stage stator impeller in the direction away from the flow-diverting protrusion 53. Two positioning grooves 101 on the inner surface of the inlet end cover 2 cooperate with these protrusions, facilitating assembly positioning and restricting the rotation of the stator impeller. A stator sealing groove 523, which is an O-ring seal groove, is provided on the outer surface of the stator blade crown near the flow-diverting protrusion 53.

[0062] Two positioning protrusions 521 are fixed on the outer surface of all stator blade crowns 52. The corresponding position of the air inlet end cover 2 or each semi-circular shell is provided with a positioning groove 101 for the positioning protrusions 521 to extend into. Since the housing 1 is a split structure, compared with the integrated housing, it is easier to set a positioning groove 101 on each semi-circular shell to achieve precise axial positioning of the stator impeller 5, and to achieve synchronous movement of the stator impeller 5 and the housing 1.

[0063] The outer surface of the stator blade crown 52 is provided with a stator sealing groove 523 to accommodate the sealing ring, so that the stator blade crown 52 is sealed to the inner surface of the corresponding air inlet end cover 2 or housing 1.

[0064] Preferably, the stator impeller 5 other than the first-stage stator impeller is connected to the housing 1 by two sealing rings, and two positioning protrusions 521 are disposed between the two sealing rings. Figure 4The embodiment, in the order from front to back, includes a first-stage stator impeller, a first-stage rotor impeller, a second-stage stator impeller, a second-stage rotor impeller, a third-stage stator impeller, and a third-stage rotor impeller. Both the second-stage and third-stage stator impellers have two rings of stator sealing grooves 523 on their stator blade crowns 52, achieving a seal between the stator impeller and the housing 1. The positioning protrusion 521 serves to quickly position and install with the housing 1 and restrict the rotation of the turbine stator 52. Stator sealing grooves 523 are provided on both sides of the positioning protrusion 521, and O-rings are placed inside the stator sealing grooves 523, ensuring that the compressed gas flow channel is only through the blade gaps 522 of the stator impeller 5.

[0065] Preferably, the rotor impeller 6 includes a rotor body, a plurality of rotor blades 61 and an annular rotor blade crown 62;

[0066] The inner surface of the housing 1 has three rings of housing protrusions 102, and the outer surface of the rotor blade crown 62 has two rings of sealing protrusions 621. Each sealing protrusion 621 is placed in the groove formed by the adjacent housing protrusions 102. It should be noted that the distance between the sealing protrusion 621 and the inner surface of the housing should not be too small to avoid collision.

[0067] Alternating arrangement of housing protrusions 102 and sealing protrusions 621 forms a sealing grate structure to achieve a sealed connection between the rotor impeller 6 and the housing 1. This provides a blade tip seal, reducing flow losses during air motor operation and significantly improving the power of the turbine motor. In existing multi-stage turbine air motors, there is a gap between the rotor blade tip and the inner wall of the air motor housing. Compressed gas experiences underflow and leakage losses as it flows through the rotor blade gaps, failing to completely pass through them. This leads to a decrease in turbine air motor power. The original flow direction of the gas causing flow damage changes, and when it merges with the mainstream gas flowing through the rotor blade gaps, it further deflects the direction of the mainstream gas, resulting in a further decrease in turbine air motor power, failing to meet theoretical requirements. The efficient sealing connection between the rotor impeller and housing in this embodiment solves the leakage problem. The multi-stage turbine air motor provided by this invention utilizes turbine mechanics principles and features an internal multi-stage crowned turbine blade structure. The outer surface of the rotor blade crown and the mating position with the housing are equipped with interlocking grate-tooth sealing structures, reducing air leakage and undercurrent losses from the rotor blades. The rotor blade crowns also improve structural rigidity and establish damping, thus reducing vibration. This reduction in flow losses significantly enhances the power output of the multi-stage turbine air motor.

[0068] Preferably, the stator blades 51 and the rotor blades 61 are arranged alternately;

[0069] Along the air intake direction, the number of blades in stator impeller 5 and rotor impeller 6 decreases sequentially, while the spacing between the blades increases sequentially.

[0070] Preferably, the stator blade 51 and the rotor blade 61 have the same root height, and the height of the top of the rotor blade 61 and the top of the stator blade 51 increases sequentially along the air intake direction. That is, the outer surface diameter of the stator body where the blade root is located and the outer surface diameter of the rotor body are the same, but along the air intake direction, the inner surface diameter of the stator blade crown or rotor blade crown where the top of the stator blade 51 and the rotor blade 61 are located increases sequentially.

[0071] The number of blades from the first-stage stator impeller, first-stage rotor impeller, second-stage stator impeller, second-stage rotor impeller, third-stage stator impeller, and third-stage rotor impeller decreases sequentially, while the clearance and height increase sequentially. The blade height of each stage increases sequentially from the inlet end cover 2 to the exhaust end cover 3. Compressed gas enters from the inlet end cover, passes through all the blades in sequence, and finally flows out from the exhaust end cover. The blade clearance increases sequentially, allowing the gas to expand fully. Both stator and rotor blades are uniformly arranged circumferentially, but their arrangement is staggered, meaning the positions of the two types of blades are not exactly aligned axially. The cross-sectional area of ​​the gas flowing through the clearance between each stage of blades gradually increases from the inlet end cover to the exhaust end cover, allowing the compressed gas to expand, depressurize, and accelerate within the channels.

[0072] The foregoing has only described certain exemplary embodiments of the present invention by way of illustration. Undoubtedly, those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the foregoing drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A crowned multi-stage turbine air motor, comprising a housing (1), an inlet end cover (2), an exhaust end cover (3), an output shaft (4) rotatably supported by the inlet end cover (2) and the exhaust end cover (3), and stator impellers (5) and rotor impellers (6) alternately arranged on the output shaft (4). The inner surface of the stator impeller (5) is connected to the bearing sleeved on the output shaft (4), and its outer surface moves synchronously with the housing (1); The rotor impeller (6) is fixedly connected to the output shaft (4) by a key; The two ends of the stator impeller (5) are axially positioned by the shoulder (42) of the output shaft (4) or by the sleeve (41) fitted on the output shaft (4), so that the adjacent stator impeller (5) and rotor impeller (6) are arranged at intervals. The housing (1) includes two semicircular shells, and the two ends of the semicircular shells are respectively connected to the air intake end cap (2) and the exhaust end cap (3) by mortise and tenon joints. The housing (1) is provided with an air inlet groove and an exhaust groove at both ends; The end of the air intake end cap (2) is provided with an air intake tenon, which includes an air intake groove (201) and an air intake protrusion (202). The shape of the air intake groove matches that of the air intake tenon to fasten to the outside of the air intake tenon. The exhaust end cap (3) is provided with an exhaust tenon at its end. The exhaust tenon includes an exhaust groove (301) and an exhaust protrusion (302). The exhaust groove matches the shape of the exhaust tenon to fasten to the outside of the exhaust tenon. The stator impeller (5) includes a stator body, multiple stator blades (51) and an annular stator blade crown (52); The first stator impeller (5) near the inlet end cover (2) is configured as the first stage stator impeller. A conical diversion protrusion (53) is fixed on the stator body of the first stage stator impeller. The diversion protrusion (53) allows the gas flowing in from the inlet end cover (2) to enter the next rotor impeller (6) along the inner surface of the housing (1). The first stage stator impeller is fitted inside the air inlet end cover (2), and the air inlet end cover (2) is provided with a stepped surface (21) that restricts the first stage stator impeller from moving toward the air inlet end cover (2). The diversion protrusion (53) has a blind hole, which is fitted onto the air inlet end of the output shaft (4); Two positioning protrusions (521) are fixed on the outer surface of all stator blade crowns (52), and positioning grooves (101) are provided at the corresponding positions of the air inlet end cover (2) or each semi-circular shell for the positioning protrusions (521) to extend into. The stator blade crown (52) has a stator sealing groove (523) on its outer surface to accommodate the sealing ring, so that the stator blade crown (52) is sealed to the inner surface of the air inlet end cover (2) or the housing (1) corresponding to the position.

2. The crowned multi-stage turbine air motor according to claim 1, characterized in that, The stator impeller (5) other than the first stage stator impeller is connected to the housing (1) by two sealing rings, and two positioning protrusions (521) are arranged between the two sealing rings.

3. The crowned multi-stage turbine air motor according to claim 1, characterized in that, The rotor impeller (6) includes a rotor body, multiple rotor blades (61) and an annular rotor blade crown (62). The inner surface of the housing (1) is provided with three rings of housing protrusions (102), and the outer surface of the rotor blade crown (62) is provided with two rings of sealing protrusions (621). Each sealing protrusion (621) is placed in the groove formed by the adjacent housing protrusions (102). The housing protrusions (102) and the sealing protrusions (621) are arranged alternately to form a sealing grate structure to achieve a sealed connection between the rotor impeller (6) and the housing (1).

4. A crowned multi-stage turbine air motor according to claim 3, characterized in that, The stator blades (51) and the rotor blades (61) are arranged alternately; Along the air intake direction, the number of blades of the stator impeller (5) and the rotor impeller (6) decreases sequentially and the spacing between the blades increases sequentially.

5. A crowned multi-stage turbine air motor according to claim 3, characterized in that, The stator blade (51) and the rotor blade (61) have the same root height, and the heights of the top of the rotor blade (61) and the top of the stator blade (51) increase sequentially along the air intake direction.

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