Vibration suppression system of high-performance turbo expander under wide-range operation working condition

Abstract

The invention relates to the technical field of energy-saving power generation of turbo expanders, in particular to a vibration suppression system of a high-performance turbo expander under a wide-range operation condition, which comprises a shell vibration reduction assembly arranged on a first-stage impeller shell and a second-stage impeller shell, and a vibration reduction seat assembly arranged at the bottom of a generator; the bottom of the motor supporting leg is supported on the supporting base through a vibration reduction seat assembly, an impeller shell support is further fixedly arranged on the supporting base, and vibration caused by uneven rotor mass is reduced through the vibration reduction seat assembly; the impeller shell support is connected with the first-stage impeller shell and the second-stage impeller shell through the shell vibration reduction assembly, and vibration caused by airflow excitation of the turbo expander is reduced through the shell vibration reduction assembly.

Description

Technical Field

[0001] The present invention relates to the technical field of energy-saving power generation of a turbine expander, and in particular to a vibration suppression system for a high-performance turbine expander under a wide range of operating conditions. Background Art

[0002] A turbo expander is a device that converts the internal energy of gas into mechanical energy and can be further used for power generation or other power drives. It plays an important role in many fields. High-temperature, high-pressure gas enters the turbo expander from the air inlet as a working fluid. These gases usually have high pressure and temperature and contain a lot of energy. The gas entering the turbo expander passes through the nozzle flow channel. Due to the injection effect, the speed of the gas rises rapidly, and the pressure and temperature drop quickly. The high-speed gas coming out of the nozzle impacts the blades of the impeller, causing the impeller to rotate at high speed. In this process, the internal energy of the gas is converted into mechanical energy for the rotation of the impeller. The impeller is connected to the shaft. The high-speed rotation of the impeller drives the shaft to rotate, thereby transmitting the mechanical energy to the generator coaxially connected to the shaft.

[0003] Turbine expander vibration is a more complex problem and may be caused by a variety of factors. During the manufacturing process, the motor rotor may have a deviation in mass distribution from the ideal state due to uneven materials, insufficient processing accuracy, etc. This unbalanced mass will generate centrifugal force during operation. As the rotor rotates, the direction of the centrifugal force changes continuously, causing vibration. In terms of process, if the intake duct design of the turbine expander is unreasonable, the airflow entering the turbine expander will be uneven, which will cause the impeller to be subjected to unstable aerodynamic forces. The airflow will generate vortices and turbulence, causing uneven distribution of aerodynamic forces on the impeller surface, causing vibration. The turbine expander performs best when operating under the designed conditions, but when the actual wide-range operating conditions (such as intake pressure, temperature, flow, etc.) deviate from the designed conditions, surge may occur. When the intake flow is too low, the gas flow in the impeller channel will separate and flow back, causing the pressure difference between the impeller inlet and outlet to fluctuate periodically, causing machine vibration, accompanied by strong noise. Summary of the invention

[0004] In view of the deficiencies in the prior art, the present invention provides a vibration suppression system for a high-performance turbine expander under a wide range of operating conditions. The vibration suppression system composed of a vibration damping seat assembly and a casing vibration damping assembly can effectively suppress vibrations caused by motor rotor mass imbalance, airflow surge, etc.

[0005] To achieve the above object, the present invention provides the following technical solutions: A vibration suppression system for a high-performance turbine expander under wide-range operating conditions, comprising a generator and a primary impeller shell and a secondary impeller shell arranged at both ends of the generator, the vibration suppression system comprising a casing vibration reduction assembly arranged on the primary impeller shell and the secondary impeller shell, and a vibration reduction seat assembly arranged at the bottom of the generator; the two ends of the motor body of the generator are fixedly connected to the primary impeller shell and the secondary impeller shell, and the bottom of the motor body is provided with motor legs; the bottom of the motor legs is supported on a supporting base through a vibration reduction seat assembly, and an impeller shell bracket is also fixedly provided on the supporting base, and the vibration caused by uneven rotor mass is reduced by the vibration reduction seat assembly; the impeller shell bracket is respectively connected to the primary impeller shell and the secondary impeller shell through the casing vibration reduction assembly, and the vibration caused by airflow excitation of the turbine expander is reduced by the casing vibration reduction assembly.

[0006] Furthermore, four motor legs are provided at the bottom of the motor body, and there are two impeller shell brackets which respectively surround the first-stage impeller shell and the second-stage impeller shell; the casing vibration damping assembly is arranged at circumferential intervals along the impeller shell bracket, and the two sides of the impeller shell bracket are fixedly connected to the support base through support feet.

[0007] Furthermore, the vibration damping seat assembly includes a support seat body and a rubber ring, the support seat body includes an upper support seat and a lower support seat; the bolts in the bolt holes in the middle of the upper support seat and the lower support seat are assembled and fixed to clamp the rubber ring between the upper support seat and the lower support seat; the inner side of the rubber ring abuts against the support seat body, and the outer side of the rubber ring abuts against the bearing hole of the support base; the upper support seat of the support seat body is fixedly connected to the lower end surface of the motor leg of the generator.

[0008] Furthermore, the upper support seat is provided with a first bearing surface with a conical structure, and a second bearing surface extending in a reverse conical shape and located on the outside of the first bearing surface; the lower support seat is provided with a third bearing surface with an inclination direction opposite to that of the first bearing surface; the bearing hole has an annular inclined end surface, and the rubber ring is arranged in the space surrounded by the inclined end surface, the first bearing surface, the second bearing surface, and the third bearing surface.

[0009] Furthermore, the upper end of the rubber ring includes a first elastic surface and a second elastic surface, the first elastic surface abuts against the first bearing surface, and the second elastic surface abuts against the second bearing surface; the lower end of the rubber ring includes a third elastic surface, the third elastic surface abuts against the third bearing surface; the outer side of the rubber ring includes a fourth elastic surface, the fourth elastic surface abuts against the oblique end surface of the bearing hole.

[0010] Furthermore, a first cavity is formed between the middle side surface of the rubber ring and the upper support seat, and a second cavity is formed between the lower end surface of the rubber ring and the lower support plate of the lower support seat; the first cavity and the second cavity can enhance the vibration reduction and buffering effect of the rubber ring; the outer periphery of the lower end of the rubber ring is a flange portion, and the flange portion is located between the lower end of the bearing hole and the lower support plate of the lower support seat.

[0011] Furthermore, the upper end of the support foot of the impeller housing bracket is an annular support plate, and a plurality of T-shaped grooves are arranged at circumferential intervals on the annular support plate; a plurality of fixing grooves are arranged at circumferential intervals on the first-stage impeller shell and the second-stage impeller shell, and the fixing grooves correspond to the positions of the T-shaped grooves; one end of the buffer plate of the housing vibration damping assembly is fixed in the T-shaped groove, and the other end of the buffer plate is plugged and fixed in the fixing groove; a fixing seat is also provided in the fixing groove to fix the end of the buffer plate; an elastic damper is provided between two adjacent buffer plates, and the elastic damper is fixed on the first-stage impeller shell and the second-stage impeller shell, and the movable end of the elastic damper abuts against the side of the buffer plate; the elastic damper provides torsional vibration damping support between the impeller housing bracket and the impeller shell.

[0012] Furthermore, a cavity is provided in the middle of the body of the buffer plate, a partition is provided in the cavity, and a U-shaped spring piece is provided in the cavity of the body on one side of the partition; the U-shaped spring piece abuts against the side wall of the cavity, and the U-shaped spring piece is located on one side of the buffer plate close to the impeller casing bracket; the opening of the cavity of the body is closed by a cover plate, and the position of the partition and the U-shaped spring piece is limited by the cover plate.

[0013] Furthermore, the partition divides the cavity in the main body into a first cavity close to the impeller shell and a second cavity close to the impeller shell bracket; the U-shaped spring piece is arranged in the second cavity to improve the elastic support of the impeller shell bracket; a plurality of strip-shaped elastomers are also filled between the U-shaped spring piece and the side wall of the second cavity; a spherical mass body is arranged in the first cavity, and a through hole is arranged on the partition to connect the first cavity and the second cavity.

[0014] Furthermore, the elastic cavity of the elastic damping is fixed on the outer side walls of the primary impeller shell and the secondary impeller shell through a support; a retractable piston rod is provided in the elastic cavity, and the movable end of the piston rod abuts against the side of the buffer plate body.

[0015] Compared with the prior art, the present invention provides a vibration suppression system for a high-performance turbine expander under a wide range of operating conditions, which has the following beneficial effects: the vibration suppression system composed of a vibration-damping seat assembly and a housing vibration-damping assembly can effectively suppress vibrations caused by motor rotor mass imbalance, airflow surge, etc., and can prevent gas leakage caused by vibration. The circumferentially arranged housing vibration-damping assembly 3 can effectively suppress the torsional vibration of the impeller housing caused by airflow excitation, while the torsional vibration of the impeller housing is more likely to cause leakage at the connection of the gas pipeline connected to the impeller housing; the annular rubber ring is set in the support seat body with an I-shaped cross-section, and the annular rubber ring can provide vibration damping and buffering for the support seat body in multiple directions in the horizontal direction. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the overall structure of the vibration suppression system of the high-performance turbine expander under wide-range operating conditions of the present invention; Figure 2 An exploded view of the vibration damping seat assembly of the present invention; Figure 3 It is a structural schematic diagram of the support seat body of the present invention; Figure 4 is a cross-sectional view of the vibration damping seat assembly of the present invention; Figure 5 A partial cross-sectional view of the vibration damping seat assembly of the present invention after assembly; Figure 6 It is a structural schematic diagram of the housing vibration reduction assembly of the present invention; Figure 7 An exploded view of the housing vibration reduction assembly of the present invention; Figure 8 is a cross-sectional view of the housing vibration reduction assembly of the present invention; Fig. 9 It is a schematic structural diagram of the elastic damping of the present invention; In the figure: First-stage impeller shell 1, fixing groove 11; Impeller housing support 2, support foot 21, T-shaped slot 22; Shell vibration reduction assembly 3, mass body 301, elastic body 302, buffer plate 31, body 311, cover plate 312, U-shaped spring piece 313, partition plate 314, through hole 3140, fixing seat 32, elastic damping 33, piston rod 331, elastic cavity 332, support 333; Generator 4, motor legs 41, motor body 42; The vibration damping seat assembly 5, the support seat body 51, the upper support seat 511, the lower support seat 512, the first bearing surface 513, the second bearing surface 514, the third bearing surface 515, the bolt hole 516, the rubber ring 52, the first elastic surface 521, the second elastic surface 522, the third elastic surface 525, the fourth elastic surface 523, the first cavity 524, the flange portion 526, and the second cavity 527; Support base 6, bearing hole 62, oblique end surface 621, boss 61; Secondary impeller housing 7; DETAILED DESCRIPTION

[0017] 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, not all of the embodiments. 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.

[0018] The following is based on the attached Figure 1-9 The present invention is described in detail. The vibration suppression system of a high-performance turbine expander under a wide range of operating conditions of the present invention comprises a generator 4 and a primary impeller shell 1 and a secondary impeller shell 7 arranged at both ends of the generator 4, and is characterized in that: the vibration suppression system comprises a casing vibration reduction assembly 3 arranged on the primary impeller shell 1 and the secondary impeller shell 7, and a vibration reduction seat assembly 5 arranged at the bottom of the generator 4; both ends of the motor body 42 of the generator 4 are fixedly connected to the primary impeller shell 1 and the secondary impeller shell 7, and the bottom of the motor body 42 is provided with a motor leg 41; the bottom of the motor leg 41 is supported on a support base 6 through a vibration reduction seat assembly 5, and an impeller shell bracket 2 is also fixedly arranged on the support base 6, and the vibration caused by uneven rotor mass is reduced by the vibration reduction seat assembly 5; the impeller shell bracket 2 is respectively connected to the primary impeller shell 1 and the secondary impeller shell 7 through the casing vibration reduction assembly 3, and the vibration caused by airflow excitation of the turbine expander is reduced by the casing vibration reduction assembly 3.

[0019] Specifically, the rotor of the turbine expander generator 4 may have a mass distribution that deviates from the ideal state due to uneven materials, insufficient processing accuracy, etc. during the manufacturing process. This unbalanced mass will generate centrifugal force during operation. The direction of the centrifugal force changes continuously with the rotation of the rotor, thereby causing vibration. The motor body 42 of the generator 4 is connected to the vibration damping seat assembly 5 on the support base 6 through the motor support legs 41. The vibration damping seat assembly 5 can provide buffering support for the generator 4 in multiple directions. At the same time, the structural setting of the vibration damping seat assembly 5 can also meet the design requirements of high load-bearing capacity.

[0020] The generator 4 of the turbine expander of the present invention is provided with a primary impeller and a secondary impeller at both ends, respectively. The air inlet pipe is firstly connected with the primary impeller shell 1 outside the primary impeller, and the air outlet of the primary impeller shell 1 is connected with the air inlet of the secondary impeller shell 7. The secondary impeller shell 7 is covered outside the secondary impeller. Uneven air intake will cause uneven airflow entering the turbine expander, causing the impeller to be subjected to unstable aerodynamic force and thus cause vibration. In the actual operation process, the gas pressure and flow in the process system may fluctuate. For example, if the operation of the upstream process equipment is unstable or the gas supply system fails, the gas pressure and flow entering the turbine expander will change instantly, which will cause the force state of the impeller to change and cause vibration. The vibration of the impeller shell caused by airflow excitation is reduced by the shell vibration reduction assembly 3 provided on the primary impeller shell 1 and the secondary impeller shell 7.

[0021] Four motor legs 41 are arranged at the bottom of the motor body 42, and there are two impeller shell brackets 2, which respectively surround the first-stage impeller shell 1 and the second-stage impeller shell 7; the casing vibration damping assembly 3 is arranged at circumferential intervals along the impeller shell bracket 2, and the two sides of the impeller shell bracket 2 are fixedly connected to the support base 6 through the support feet 21.

[0022] The airflow excitation at the impeller of the turbine expander will cause the impeller casing to produce intermittent circumferential vibration. The casing vibration reduction assembly 3 arranged circumferentially along the first-stage impeller casing 1 and the second-stage impeller casing 7 can effectively suppress the torsional vibration of the impeller casing caused by the airflow excitation. At the same time, the torsional vibration of the impeller casing is more likely to cause leakage at the connection of the gas pipeline connected to the impeller casing. The circumferentially arranged casing vibration reduction assembly 3 can reduce the torsional vibration of the impeller casing and ensure the sealing of the gas pipeline on the impeller casing.

[0023] The vibration damping seat assembly 5 includes a support seat body 51 and a rubber ring 52, and the support seat body 51 includes an upper support seat 511 and a lower support seat 512; the bolts in the bolt holes 516 in the middle of the upper support seat 511 and the lower support seat 512 are assembled and fixed to clamp the rubber ring 52 between the upper support seat 511 and the lower support seat 512; the inner side of the rubber ring 52 abuts against the support seat body 51, and the outer side of the rubber ring 52 abuts against the bearing hole 62 of the support base 6; the upper support seat 511 of the support seat body 51 is fixedly connected to the lower end surface of the motor leg 41 of the generator 4.

[0024] Specifically, the cross-sections of the upper support seat 511 and the lower support seat 512 are both T-shaped structures. Figure 3As shown, the cross-section of the upper support seat 511 and the lower support seat 512 after being assembled and fixed by bolts in the middle bolt hole 516 is I-shaped, and the annular rubber ring 52 is sleeved in the support seat body 51 of the I-shaped cross-section. The annular rubber ring 52 can provide vibration reduction and buffering for the support seat body 51 in multiple directions in the horizontal direction. At the same time, when the impellers on both sides of the generator 4 are rotating, the rotational dynamic balance of the impellers may cause the generator 4 to generate horizontal torsional vibrations. The annular rubber rings 52 at the bottom of the four motor legs 41 of the generator 4 can effectively suppress the torsional vibrations of the generator 4 in the horizontal direction.

[0025] The upper support seat 511 is provided with a first bearing surface 513 with a conical structure, and a second bearing surface 514 extending in a reverse conical shape on the outside of the first bearing surface 513; the lower support seat 512 is provided with a third bearing surface 515 with an inclination direction opposite to that of the first bearing surface 513; the bearing hole 62 has an annular inclined end surface 621, and the rubber ring 52 is arranged in the space surrounded by the inclined end surface 621, the first bearing surface 513, the second bearing surface 514, and the third bearing surface 515.

[0026] Specifically, the upper support seat 511 includes a laterally extending upper support plate, the upper end surface of the upper support plate is fixedly connected to the bottom of the motor leg 41, the lower end surface of the upper support plate is provided with a first bearing surface 513 and a second bearing surface 514, the upper end of the first bearing surface 513 is connected to the second bearing surface 514, the lower end of the first bearing surface 513 is also provided with an inclined conical surface, and the inclined conical surface is connected to the third bearing surface 515 of the lower support seat 512 after assembly, and the lower end of the lower support seat 512 is a laterally extending lower support plate, and the upper end of the lower support plate is provided with a third bearing surface 515.

[0027] The upper end of the rubber ring 52 includes a first elastic surface 521 and a second elastic surface 522, wherein the first elastic surface 521 abuts against the first bearing surface 513, and the second elastic surface 522 abuts against the second bearing surface 514; the lower end of the rubber ring 52 includes a third elastic surface 525, wherein the third elastic surface 525 abuts against the third bearing surface 515; the outer side of the rubber ring 52 includes a fourth elastic surface 523, wherein the fourth elastic surface 523 abuts against the inclined end surface 621 of the bearing hole 62.

[0028] Specifically, the first elastic surface 521 and the second elastic surface 522 form the annular upper end surface of the rubber ring 52. An upward protrusion is formed on the first elastic surface 521 and the second elastic surface 522. The protrusion cooperates with the concave between the first bearing surface 513 and the second bearing surface 514 in the upper support seat 511, which can better bear the vertical load and provide lateral buffer support. When subjected to lateral vibration force, the force can be better transmitted to the body of the lateral rubber ring 52 to achieve buffering. The oblique end surface 621 of the bearing hole 62 is an annular end surface. See the attached Figure 5 The inclined end surface 621 can provide greater support for vertical loads. After assembly, the extrusion force applied to the surrounding areas by the rubber ring 52 can be borne by the inclined end surface 621 .

[0029] A first cavity 524 is formed between the middle side surface of the rubber ring 52 and the upper support seat 511, and a second cavity 527 is formed between the lower end surface of the rubber ring 52 and the lower support plate of the lower support seat 512; the first cavity 524 and the second cavity 527 can enhance the vibration reduction and buffering effect of the rubber ring 52; the outer periphery of the lower end of the rubber ring 52 is a flange portion 526, and the flange portion 526 is located between the lower end of the bearing hole 62 and the lower support plate of the lower support seat 512.

[0030] Specifically, in other embodiments of the present invention, a conical spring is provided in the first cavity 524, and the conical spring is sleeved on the upper support seat 511. The conical spring can further enhance the vibration damping effect of the vibration damping seat assembly 5 and provide a greater vertical load support force. The flange portion 526 is located at the lower end of the fourth elastic surface 523 and extends outward. The upper end of the fourth elastic surface 523 also has a second flange portion extending outward. After the rubber ring 52 is assembled in the bearing hole 62 of the support base 6, the first elastic surface 521 and the second elastic surface 522 of the rubber ring 52 are both higher than the upper end surface of the support base 6.

[0031] The upper end of the support foot 21 of the impeller shell bracket 2 is an annular support plate, and a plurality of T-shaped grooves 22 are arranged at intervals in the circumferential direction of the annular support plate; a plurality of fixing grooves 11 are arranged at intervals in the circumferential direction of the first-stage impeller shell 1 and the second-stage impeller shell 7, and the fixing grooves 11 correspond to the positions of the T-shaped grooves 22; one end of the buffer plate 31 of the housing vibration reduction assembly 3 is fixed in the T-shaped groove 22, and the other end of the buffer plate 31 is inserted and fixed in the fixing groove 11; a fixing seat 32 is also provided in the fixing groove 11 to fix the end of the buffer plate 31; an elastic damper 33 is provided between two adjacent buffer plates 31, and the elastic damper 33 is fixed on the first-stage impeller shell 1 and the second-stage impeller shell 7, and the movable end of the elastic damper 33 abuts against the side of the buffer plate 31; the torsional vibration reduction support between the impeller shell bracket 2 and the impeller shell is provided by the elastic damper 33.

[0032] Specifically, the interface of the buffer plate 31 is T-shaped, the T-shaped portion of the buffer plate 31 is inserted and fixed in the T-shaped groove 22 of the impeller housing support 2, and the fixing seat 32 radially fixes the buffer plate 31 in the fixing groove 11. Specifically, as shown in FIG. Figure 7 As shown, the fixing seat 32 includes an inserting portion inserted in the fixing groove 11, and a limiting support plate fitted with the outer end surface of the impeller shell, a through groove is provided in the middle of the limiting support plate, and the buffer plate 31 is inserted and fixed in the fixing groove 11 after passing through the through groove, and the side of the buffer plate 31 can be limited and fixed by the limiting support plate.

[0033] A cavity is provided in the middle of the main body 311 of the buffer plate 31, a partition 314 is provided in the cavity, and a U-shaped spring piece 313 is provided in the cavity of the main body 311 on one side of the partition 314; the U-shaped spring piece 313 abuts against the side wall of the cavity, and the U-shaped spring piece 313 is located on one side of the buffer plate 31 close to the impeller casing bracket 2; the opening of the cavity of the main body 311 is closed by a cover plate 312, and the positions of the partition 314 and the U-shaped spring piece 313 are limited by the cover plate 312.

[0034] Specifically, the side walls on both sides of the cavity arranged in the middle of the main body 311 are provided with fixing grooves for clamping the partition 314. After the partition 314 is inserted into the fixing groove, the cover 312 is fixed at the cavity opening in the middle of the main body 311, and the cover 312 abuts against the side of the partition 314 to achieve fixation.

[0035] The partition 314 divides the cavity in the main body 311 into a first cavity close to the impeller shell and a second cavity close to the impeller shell bracket 2; the U-shaped spring piece 313 is arranged in the second cavity to improve the elastic support of the impeller shell bracket 2; a plurality of strip-shaped elastomers 302 are also filled between the U-shaped spring piece 313 and the side wall of the second cavity; a spherical mass body 301 is arranged in the first cavity, and a through hole 3140 is arranged on the partition 314 to connect the first cavity and the second cavity.

[0036] Specifically, the partition 314 divides the main body 311 into a first cavity and a second cavity, thereby reducing the vibration response amplitude of the buffer plate 31. After the mass body 301 in the first cavity is excited by the vibration of the impeller housing, the mutual collision and friction between the mass bodies 301 can effectively absorb and dissipate the vibration energy, thereby improving the vibration suppression effect of the first-stage impeller shell 1 and the second-stage impeller shell 7. The through hole 3140 on the partition 314 allows the gas in the first cavity and the second cavity to circulate after the buffer plate 31 is stimulated to vibrate, thereby consuming the vibration energy transmitted from the impeller housing to the impeller shell bracket 2.

[0037] The elastic cavity 332 of the elastic damper 33 is fixed on the outer side wall of the first-stage impeller shell 1 and the second-stage impeller shell 7 through a support 333; a retractable piston rod 331 is arranged in the elastic cavity 332, and the movable end of the piston rod 331 abuts against the side of the buffer plate 31 body 311. Specifically, the elastic damper 33 can be an air spring, and the elastic damper 33 is circumferentially arranged between the buffer plates 31, and the elastic damper 33 abuts against the side buffer plates 31 to provide circumferential buffer support for the buffer plates 31.

[0038] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A vibration suppression system for a high-performance turbo expander under wide-range operating conditions, comprising a generator (4) and a primary impeller shell (1) and a secondary impeller shell (7) arranged at both ends of the generator (4), characterized in that: The vibration suppression system comprises a casing vibration reduction assembly (3) arranged on the first-stage impeller casing (1) and the second-stage impeller casing (7), and a vibration reduction seat assembly (5) arranged at the bottom of the generator (4); Two ends of the motor body (42) of the generator (4) are fixedly connected to the first-stage impeller shell (1) and the second-stage impeller shell (7), and a motor support leg (41) is provided at the bottom of the motor body (42); The bottom of the motor support leg (41) is supported on a support base (6) via a vibration damping seat assembly (5); an impeller housing bracket (2) is also fixedly arranged on the support base (6); and the vibration damping seat assembly (5) is used to reduce vibration caused by uneven rotor mass; The impeller housing bracket (2) is respectively connected to the first-stage impeller housing (1) and the second-stage impeller housing (7) via a housing vibration reduction assembly (3), and the housing vibration reduction assembly (3) reduces vibration caused by airflow excitation of the turbine expander.

2. The vibration suppression system according to claim 1, characterized in that: Four motor legs (41) are arranged at the bottom of the motor body (42); the impeller housing brackets (2) are two and respectively surround the first-stage impeller housing (1) and the second-stage impeller housing (7); The housing vibration damping components (3) are arranged at intervals along the circumference of the impeller housing support (2), and two sides of the impeller housing support (2) are fixedly connected to the support base (6) via support feet (21).

3. The vibration suppression system according to claim 2, characterized in that: The vibration-damping seat assembly (5) comprises a support seat body (51) and a rubber ring (52); the support seat body (51) comprises an upper support seat (511) and a lower support seat (512); Bolts in the bolt holes (516) in the middle of the upper support seat (511) and the lower support seat (512) are assembled and fixed to clamp the rubber ring (52) between the upper support seat (511) and the lower support seat (512); The inner side of the rubber ring (52) abuts against the support seat body (51), and the outer side of the rubber ring (52) abuts against the bearing hole (62) of the support base (6); The upper support seat (511) of the support seat body (51) is fixedly connected to the lower end surface of the motor support leg (41) of the generator (4).

4. The vibration suppression system according to claim 3, characterized in that: The upper support seat (511) is provided with a first bearing surface (513) with a conical structure, and a second bearing surface (514) extending in a reverse conical shape and located outside the first bearing surface (513); The lower support seat (512) is provided with a third bearing surface (515) having an inclination direction opposite to that of the first bearing surface (513); The bearing hole (62) has a ring-shaped oblique end surface (621), and the rubber ring (52) is arranged in a space surrounded by the oblique end surface (621), the first bearing surface (513), the second bearing surface (514), and the third bearing surface (515).

5. The vibration suppression system according to claim 4, characterized in that: The upper end of the rubber ring (52) comprises a first elastic surface (521) and a second elastic surface (522); the first elastic surface (521) abuts against the first bearing surface (513), and the second elastic surface (522) abuts against the second bearing surface (514); The lower end of the rubber ring (52) comprises a third elastic surface (525), and the third elastic surface (525) abuts against the third bearing surface (515); The outer side of the rubber ring (52) comprises a fourth elastic surface (523), and the fourth elastic surface (523) abuts against the inclined end surface (621) of the bearing hole (62).

6. The vibration suppression system according to claim 5, characterized in that: A first cavity (524) is formed between the middle side surface of the rubber ring (52) and the upper support seat (511), and a second cavity (527) is formed between the lower end surface of the rubber ring (52) and the lower support plate of the lower support seat (512); The first cavity (524) and the second cavity (527) can enhance the vibration reduction and buffering effect of the rubber ring (52); The outer periphery of the lower end of the rubber ring (52) is a flange portion (526), ​​and the flange portion (526) is located between the lower end of the bearing hole (62) and the lower supporting plate of the lower supporting seat (512).

7. The vibration suppression system according to claim 6, characterized in that: The upper end of the support foot (21) of the impeller housing support (2) is an annular support plate, and a plurality of T-shaped grooves (22) are arranged at intervals in the circumferential direction of the annular support plate; The first-stage impeller shell (1) and the second-stage impeller shell (7) are provided with a plurality of fixing grooves (11) at intervals in the circumferential direction, and the fixing grooves (11) correspond in position to the T-shaped grooves (22); One end of the buffer plate (31) of the housing vibration reduction assembly (3) is fixed in the T-shaped groove (22), and the other end of the buffer plate (31) is inserted and fixed in the fixing groove (11); A fixing seat (32) is also provided in the fixing groove (11) to fix the end of the buffer plate (31); An elastic damper (33) is provided between two adjacent buffer plates (31), the elastic damper (33) being fixed to the first-stage impeller shell (1) and the second-stage impeller shell (7), and the movable end of the elastic damper (33) abuts against the side surface of the buffer plate (31); Torsional vibration reduction support is provided between the impeller shell support (2) and the impeller shell by means of the elastic damping (33).

8. The vibration suppression system according to claim 7, characterized in that: A cavity is provided in the middle of the body (311) of the buffer plate (31), a partition (314) is provided in the cavity, and a U-shaped spring piece (313) is provided in the cavity of the body (311) on one side of the partition (314); The U-shaped spring piece (313) abuts against the side wall of the cavity, and the U-shaped spring piece (313) is located on one side of the buffer plate (31) close to the impeller housing bracket (2); The opening of the cavity of the body (311) is closed by a cover plate (312), and the positions of the partition plate (314) and the U-shaped elastic sheet (313) are limited by the cover plate (312).

9. The vibration suppression system according to claim 8, characterized in that: The partition plate (314) divides the cavity in the body (311) into a first cavity close to the impeller shell and a second cavity close to the impeller shell bracket (2); The U-shaped spring sheet (313) is arranged in the second cavity to improve the elastic support for the impeller housing bracket (2); A plurality of strip-shaped elastic bodies (302) are also filled between the U-shaped spring piece (313) and the side wall of the second cavity; A spherical mass body (301) is arranged in the first cavity, and a through hole (3140) is arranged on the partition (314) to connect the first cavity and the second cavity.

10. The vibration suppression system according to claim 9, characterized in that: The elastic cavity (332) of the elastic damper (33) is fixed to the outer side walls of the first-stage impeller shell (1) and the second-stage impeller shell (7) via a support (333); A retractable piston rod (331) is disposed in the elastic cavity (332), and a movable end of the piston rod (331) abuts against a side surface of a body (311) of the buffer plate (31).

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