A self-balancing multi-stage liquid ring compressor

Abstract

The present invention belongs to the field of liquid ring compressors, and proposes a self-balancing multi-stage liquid ring compressor, including a base, a motor, a coupling, a rotating shaft, a rear-stage pump, a front-stage pump, a front-stage impeller, a rear-stage impeller, a connecting pipe, a front support assembly, a rear support assembly and a self-balancing spacer, wherein the self-balancing spacer includes a sleeve, and the interior of the sleeve is provided with two axially spaced balance ring groups, and the interior of the balance ring group is provided with a self-priming hydraulic balance bearing bush assembly, and the self-priming hydraulic balance bearing bush assembly is used to balance the axial load and establish an oil film system that cooperates with the rotating shaft. The outer side of the sleeve is provided with three hydraulic buffers distributed in a herringbone shape, and the pressure end of the hydraulic buffer radially extends and contacts the circumferential side of the balance ring group. The present invention has a reasonable design, a simple structure, good dynamic balance performance, is conducive to ensuring the stability of the working pressure and is conducive to extending the actual service life of the equipment, and is suitable for large-scale promotion.

Description

Technical Field

[0001] The invention belongs to the field of liquid ring compressors and relates to a self-balancing multi-stage liquid ring compressor. Background Art

[0002] The pressure range that a single-stage compressor can increase is very limited. For occasions requiring higher gas working pressure, single-stage compression is not only uneconomical, but sometimes even impossible to achieve. Therefore, multi-stage compression must be used in some cases. Multi-stage compression is to divide the total pressure of the gas into several levels, and compress the gas step by step according to the order of the stages. The multi-stage liquid ring compressor is an impeller mounted on the shaft, which is eccentrically installed in the cylindrical pump body and can rotate in it to form a rotating liquid ring in the pump body. The liquid ring pulsates between the two blades of the impeller. On the suction side, the liquid ring gradually moves away from the impeller hub, and the gas enters the pump axially through the suction port on the disc; on the exhaust side, the liquid ring gradually approaches the impeller hub, the gas is compressed and axially discharged through the exhaust port on the disc, and then enters the next stage, and repeats the compression process of the previous stage.

[0003] The existing patent CN204877986U is a two-stage water ring compressor, which belongs to the field of vacuum compression pumps; it includes a pump body, a single impeller is arranged in the pump body, a single impeller partition is arranged in the middle of the single impeller, a pump body partition is arranged on the pump body corresponding to the single impeller partition, a front disc and a rear disc are arranged at both ends of the single impeller, and the front disc and the rear disc are provided with vents, the single impeller partition, the pump body partition and the front disc form a high cavity, and the single impeller partition, the pump body partition and the rear disc form a low cavity. The water ring compressor realizes two-stage compression by setting a single impeller and dividing the cavity into a high cavity and a low cavity by the single impeller partition and the pump body partition; however, this single-suction two-stage compressor has the problem of unstable axial force.

[0004] The existing patent CN208900355U discloses a double-impeller compression water ring vacuum pump, including a base, a pump body, a coupling and a motor are arranged on the base, the motor drives the pump body through the coupling, the pump body includes a front pump, a back pump and a connecting pipe arranged in sequence, the front pump includes a front distribution plate, a front pump cover and a front impeller, the back pump includes a back distribution plate, a rear pump cover and a rear impeller, the front pump cover is connected to the rear pump cover through the connecting pipe, and the front pump and the back pump are respectively provided with a front bearing bracket and a rear bearing bracket, the front bearing bracket and the rear bearing bracket are connected with a pump shaft, the front impeller and the rear impeller are eccentrically fixed to the front pump and the back pump through the pump shaft, the bottom of the front pump cover is provided with a water injection port, the water injection port is provided with an electric valve, and the front pump is provided with a liquid level gauge. This double-suction two-stage vacuum pump compressor has the advantages of symmetrical structure, relatively balanced axial force, and relatively stable operation. However, the center axis position of this vacuum pump compressor is prone to produce an unbalanced load, which is a dynamically unstable load and has a certain impact on the dynamic balance of the double impeller, thereby affecting the stability of the compression pressure and the actual service life of the double impeller and the shaft. Summary of the invention

[0005] In view of the technical problems existing in the above-mentioned multi-stage liquid ring compressor, the present invention proposes a self-balancing multi-stage liquid ring compressor with reasonable design, good dynamic balancing performance, which is beneficial to ensuring the stability of working pressure and extending the actual service life of the equipment.

[0006] In order to achieve the above-mentioned purpose, the technical solution adopted by the present invention is that a self-balancing multi-stage liquid ring compressor provided by the present invention includes a base, a motor is arranged on the base, a coupling, a rotating shaft, a rear-stage pump and a front-stage pump are arranged at the power output end of the motor, a first-stage air intake port and a first-stage air exhaust port are arranged on the front-stage pump and a front-stage impeller is arranged inside the front-stage pump, a second-stage air intake port and a second-stage air exhaust port are arranged on the rear-stage pump and a rear-stage impeller is arranged inside the rear-stage pump, the first-stage air exhaust port and the second-stage air intake port are connected by a connecting pipe, a front support assembly and a rear support assembly are arranged at both ends of the front-stage pump and the rear-stage pump, a self-balancing spacer is arranged between the front-stage pump and the rear-stage pump, the self-balancing spacer includes a sleeve seat, and the sleeve An eccentric mounting hole is provided inside the seat, two axially spaced balancing grooves are provided inside the sleeve, a balancing ring group is provided in the balancing groove, the balancing ring group is provided with an eccentric shaft hole corresponding to the mounting hole, a self-priming hydraulic balancing bearing assembly is provided in the eccentric shaft hole, the self-priming hydraulic balancing bearing assembly is used to balance the axial load and establish an oil film system that cooperates with the rotating shaft, both ends of the self-priming hydraulic balancing bearing assembly cooperate with the countersunk grooves provided at the ends of the front-stage impeller and the rear-stage impeller, sealing end covers are provided on the two end surfaces of the sleeve, and three hydraulic buffers distributed in a herringbone shape are provided on the outside of the sleeve, and the pressure end of the hydraulic buffer radially extends and contacts toward the circumferential side of the balancing ring group.

[0007] Preferably, the balancing ring group includes two circular movable rings that are connected to each other on the left and right, the top of the movable ring is provided with a movable groove that is overlapped with the other movable ring in front and behind, the bottom of the movable ring is provided with a wedge surface that forms a V-shaped opening with the other movable ring, and the outer ring side of the movable ring is provided with a semi-lunar pressure groove, and an arc-shaped compression spring is provided in the pressure groove, one end of the compression spring is a fixed end and the other end faces the inner groove surface of the balancing groove.

[0008] Preferably, the self-priming hydraulically balanced bearing assembly includes two axially butted inner bearings, the side surfaces of the inner bearings are provided with a plurality of radial self-priming holes, the outer sides of the inner bearings are provided with an annular groove, an outer bearing is provided in the annular grooves of the two inner bearings, the outer bearing is provided with a plurality of countersunk holes corresponding to the self-priming holes, the countersunk holes are provided with oil plugs, the ends of the oil plugs are connected to the self-priming holes, the aperture of the self-priming holes is larger than the end diameter of the oil plugs, a sleeve is provided on the outer side of the outer bearing, a plurality of through holes are provided on the side surfaces of the sleeves, the cross-section of the sleeve is in a T-shaped structure, the T-shaped end of the sleeve is movably matched with the eccentric shaft hole, the T-shaped sides of the sleeve are provided with imbricate shell groups, and the sleeve and the imbricate shell group are in axially movable fit.

[0009] Preferably, the shingle group comprises a plurality of axially distributed dish-shaped tiles, dish-shaped grooves are arranged on both side tile surfaces of the dish-shaped tiles, and the tile edges of the dish-shaped tiles are V-shaped.

[0010] Preferably, the ends of the inner bearing and the outer bearing are provided with countersunk ring grooves, and both ends of the inner bearing and the outer bearing are provided with pressure covers that match the countersunk ring grooves, and the pressure covers are provided with screw holes connecting the inner bearing and the outer bearing.

[0011] Preferably, the hydraulic buffer includes a flange plate connected to a flange seat arranged on the outside of the sleeve, an outer cylinder sleeve is arranged on the flange plate, an inner tube is concentrically arranged inside the outer cylinder sleeve, a pressure shaft axially movably nested with the inner tube is arranged at the center of the outer cylinder sleeve, an inner ring groove is arranged inside the pressure shaft, a first spring is arranged between the inner ring groove and the inner tube, an oil channel is arranged at the center of the pressure shaft, a T-shaped pressure oil nozzle is arranged at the end of the oil channel, and the pressure oil nozzle is provided with an oil nozzle hole on its side away from the inner tube.

[0012] Preferably, a second spring is sleeved on the pressure oil nozzle, and the second spring is connected to the oil channel.

[0013] Preferably, there are at least two nozzle holes on the pressure nozzle, which are respectively facing two balance ring groups.

[0014] Preferably, the sleeve comprises an upper sleeve and a lower sleeve, and the upper sleeve and the lower sleeve are butt-jointed.

[0015] Preferably, the outer sides of the front-stage pump, the balancing spacer and the rear-stage pump are all provided with connecting ears, and the front and rear connecting ears facing each other are connected by anti-detachment bolts.

[0016] Compared with the prior art, the advantages and positive effects of the present invention are:

[0017] 1. The present invention provides a self-balancing multi-stage liquid ring compressor, wherein the self-balancing spacer sleeve serves to isolate the front-stage pump and the rear-stage pump, thereby realizing double-suction and two-stage vacuum compression, and has the advantages of symmetrical structure, relatively balanced axial force, and relatively stable operation.

[0018] 2. The present invention provides a self-balancing multi-stage liquid ring compressor, in which the self-priming hydraulic balance bearing assembly can bear the axial movement pressure of the front-stage impeller and the rear-stage impeller, and while being subjected to dynamic radial pressure, it can cooperate with the balance ring group and the hydraulic buffer to achieve dynamic balance of the radial load, thereby improving the self-balancing performance of the equipment.

[0019] 3. The present invention provides a self-balancing multi-stage liquid ring compressor, in which the self-priming hydraulically balanced bearing assembly can automatically replenish a certain amount of hydraulic oil from the hydraulic buffer during the process of achieving axial automatic balancing, thereby ensuring that a stable hydraulic pressure is formed in the self-priming hydraulically balanced bearing assembly and forming a smooth oil film on the surface of the rotating shaft, thereby improving the working performance of the rotating shaft and the front-stage impeller and the rear-stage impeller.

[0020] 4. The device has reasonable design, simple structure, good dynamic balance performance, is conducive to ensuring the stability of working pressure and extending the actual service life of the equipment, and is suitable for large-scale promotion. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0022] Figure 1 An axonometric view of a self-balancing multi-stage liquid ring compressor provided in an embodiment;

[0023] Figure 2 A schematic diagram of the external structure of a self-balancing multi-stage liquid ring compressor provided in an embodiment;

[0024] Figure 3 A front view of a self-balancing multi-stage liquid ring compressor provided in an embodiment;

[0025] Figure 4 It is a cross-sectional view of a self-balancing multi-stage liquid ring compressor (without base and motor);

[0026] Figure 5 It is an axonometric view of the partial structure of the front stage pump, the self-balancing spacer and the back stage pump;

[0027] Figure 6 An exploded view of a self-balancing spacer provided in an embodiment;

[0028] Figure 7 An axonometric view of a self-balancing spacer provided for an embodiment;

[0029] Figure 8 A side view of a self-balancing spacer provided for an embodiment;

[0030] Fig. 9 A cross-sectional view of a self-balancing multi-stage liquid ring compressor provided in an embodiment along the BB direction;

[0031] Fig.10 A cross-sectional view of a self-balancing multi-stage liquid ring compressor in the CC direction provided in an embodiment;

[0032] Fig.11 A cross-sectional view of the self-balancing spacer provided in the embodiment in the DD direction;

[0033] Fig.12 for Figure 4 A magnified schematic diagram of the structure in the middle;

[0034] Fig.13 for Fig.11 A magnified schematic diagram of structure B in the middle;

[0035] Fig.14 A front view of a balancing ring assembly provided in an embodiment;

[0036] Fig.15 An axonometric view of a balancing ring assembly provided for an embodiment;

[0037] In the above figures, 1, base; 2, motor; 3, coupling; 4, rotating shaft; 5, rear-stage pump; 51, second-stage air intake; 52, second-stage air exhaust; 53, rear-stage impeller; 6, front-stage pump; 61, first-stage air intake; 62, first-stage air exhaust; 63, front-stage impeller; 7, connecting pipe; 8, self-balancing spacer; 81, sleeve; 811, balancing groove; 82, balancing ring group; 821, eccentric shaft hole; 822, moving ring; 823, movable groove; 824, wedge surface; 825, pressure groove; 826, compression spring; 83, self-priming hydraulic balance bearing assembly ;831, inner bearing;832, self-priming hole;833, outer bearing;834, countersunk hole;835, oil plug;836, bushing;837, shingle group;8371, dish-shaped bearing;838, gland;839, countersunk ring groove;84, sealing end cover;85, hydraulic buffer;851, flange plate;852, outer cylinder sleeve;853, inner tube;854, pressure shaft;855, first spring;856, oil channel;857, pressure oil nozzle;858, oil nozzle hole;859, second spring;86, flange seat;9, connecting ear;10, anti-drop bolt. DETAILED DESCRIPTION

[0038] In order to more clearly understand the above-mentioned objects, features and advantages of the present invention, the present invention is further described below in conjunction with the accompanying drawings and embodiments. It should be noted that the embodiments of the present application and the features in the embodiments can be combined with each other without conflict. For the convenience of description, if the words "upper", "lower", "left" and "right" appear below, they only indicate that the upper, lower, left and right directions are consistent with the accompanying drawings themselves, and do not limit the structure.

[0039] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways than those described herein. Therefore, the present invention is not limited to the specific embodiments of the following disclosure.

[0040] Examples, such as Figures 1 to 15As shown, a self-balancing multi-stage liquid ring compressor provided by the present invention comprises a base 1, a motor 2 is arranged on the base 1, a coupling 3, a rotating shaft 4, a rear-stage pump 5 and a front-stage pump 6 are arranged at the power output end of the motor 2, a first-stage air intake port 61 and a first-stage air exhaust port 62 are arranged on the front-stage pump 6, and a front-stage impeller 63 is arranged inside the front-stage pump 6, a second-stage air intake port 51 and a second-stage air exhaust port 52 are arranged on the rear-stage pump 5, and a rear-stage impeller 53 is arranged inside the rear-stage pump 5, the first-stage air exhaust port 62 is connected to the second-stage air intake port 51 through a connecting pipe 7, and a front support assembly and a rear support assembly are arranged at both ends of the front-stage pump 6 and the rear-stage pump 5. Among them, the front support assembly and the rear support assembly support the rotating shaft 4 and reduce the rotation resistance of the rotating shaft 4 at the same time. After the front-stage pump 6 is connected with the rear-stage pump 5, the first-stage air intake port 61 sucks in the front-stage pump 6, and the front-stage pump 6 compresses the gas and discharges it from the first-stage exhaust port 62, and enters the rear-stage pump 5 from the connecting pipe 7 and the second-stage air intake port 51, and the gas that is compressed for the second time in the rotating space of the rear-stage impeller 53 is discharged from the second-stage exhaust port 52.

[0041] On this basis, the present invention provides a self-balancing spacer 8 between the front-stage pump 6 and the rear-stage pump 5, and the self-balancing spacer 8 includes a sleeve 81, and the sleeve 81 is eccentrically provided with a mounting hole, and the sleeve 81 is provided with two axially spaced balancing grooves 811, and a balancing ring group 82 is provided in the balancing groove 811, and the balancing ring group 82 is provided with an eccentric shaft hole 821 corresponding to the mounting hole, and a self-priming hydraulic balancing bearing assembly 83 is provided in the eccentric shaft hole 821. The self-priming hydraulic balancing bearing assembly 83 is used to balance the axial load and establish an oil film system that is movably matched with the rotating shaft 4. Both ends of the self-priming hydraulic balancing bearing assembly 83 cooperate with the countersunk grooves provided at the ends of the front-stage impeller 63 and the rear-stage impeller 53, and sealing end covers 84 are provided on the two end surfaces of the sleeve 81, and three hydraulic buffers 85 distributed in a herringbone shape are provided on the outer side of the sleeve 81, and the pressure end of the hydraulic buffer 85 radially extends and contacts the circumferential side of the balancing ring group 82.

[0042] In this device, due to the working characteristics of the liquid ring compressor, the rotating shaft 4, the front-stage impeller 63 and the rear-stage impeller 53 are all eccentrically designed. Therefore, considering the assembly requirements of the rotating shaft 4 and the self-balancing spacer 8, the present invention also adopts an eccentric design for the mounting hole and the eccentric shaft hole 821. The self-balancing spacer 8 plays the role of isolating the front-stage pump 6 and the rear-stage pump 5, isolating the working chambers of the two compression operations, and allowing the two compression operations to be completed in a progressive manner, thereby realizing double-suction two-stage vacuum compression, and having the advantages of structural symmetry, relatively balanced axial force, and relatively stable operation. Furthermore, the self-priming hydraulically balanced bearing assembly 83 can bear the axial movement pressure of the front-stage impeller 63 and the rear-stage impeller 53, and while being subjected to dynamic radial pressure, it can cooperate with the balance ring group 82 and the hydraulic buffers 85 in three directions to achieve dynamic balance of radial loads, thereby improving the self-balancing performance of the device and helping to extend the actual service life of the device.

[0043] Regarding the self-priming hydraulically balanced bearing assembly 83, in the process of achieving axial automatic balancing, the negative pressure environment generated can automatically obtain a certain amount of hydraulic oil from the hydraulic buffer 85 and replenish it to the self-priming hydraulically balanced bearing assembly 83, which not only ensures the formation of dynamically balanced hydraulic pressure in the self-priming hydraulically balanced bearing assembly 83, but also forms a smooth oil film on the surface of the rotating shaft 4, thereby improving the working performance of the rotating shaft 4 and the front-stage impeller 63 and the rear-stage impeller 53.

[0044] In order to improve the self-balancing performance of the internal structure of the self-balancing spacer 8, the balancing ring group 82 provided by the present invention includes two circular movable rings 822 that are connected to each other on the left and right, and the top of the movable ring 822 is provided with a movable groove 823 that is overlapped with the other movable ring 822 in front and back, and the bottom end of the movable ring 822 is provided with a wedge surface 824 that forms a V-shaped opening with the other movable ring 822, and the outer ring side of the movable ring 822 is provided with a semi-lunar pressure groove 825, and the pressure groove 825 is provided with an arc-shaped compression spring 826, one end of the compression spring 826 is a fixed end and the other end thereof faces the inner groove surface of the balancing groove 811. Due to the position characteristics of the eccentric shaft hole 821, the balance ring group 82 and the rotating shaft 4 are also eccentrically matched, and the balance ring group 82 will not produce a large rotation when floating; if the rotating shaft 4 has radial force floating, the pressure acting on the moving ring 822 will be different per unit circumference, and the moving ring 822 in the same group will produce a corresponding opening and closing in the direction of the movable groove 823 and the wedge surface 824, and the compression spring 826 will also produce a corresponding deformation, which has a tendency to reset to the original balance direction, so that the two moving rings 822 in the same group can return to the balance position in time, thereby ensuring the working balance performance of the self-priming hydraulic balance bearing assembly 83 together with the rotating shaft 4 inside the equipment.

[0045] In order to improve the self-balancing performance of the self-priming hydraulically balanced bearing bush assembly 83, the self-priming hydraulically balanced bearing bush assembly 83 provided by the present invention includes two axially butted inner bearing bushes 831, the side of the inner bearing bushes 831 is provided with a plurality of radial self-priming holes 832, the outer side of the inner bearing bushes 831 is provided with an annular groove, an outer bearing bush 833 is provided in the annular groove of the two inner bearing bushes 831, and a plurality of countersunk holes 834 corresponding to the self-priming holes 832 are provided on the outer bearing bush 833, and the countersunk holes 834 are provided with The oil plug 835, the end of the oil plug 835 is connected to the self-priming hole 832, the aperture of the self-priming hole 832 is larger than the end diameter of the oil plug 835, a shaft sleeve 836 is arranged on the outer side of the outer bearing 833, a plurality of through holes are arranged on the side of the shaft sleeve 836, the cross section of the shaft sleeve 836 is a T-shaped structure, the T-shaped end of the shaft sleeve 836 is movably matched with the eccentric shaft hole 821, and the two sides of the T-shape of the shaft sleeve 836 are provided with imbrication groups 837, and the shaft sleeve 836 and the imbrication groups 837 are axially movable. Among them, the two inner bearings 831 are nested with the outer bearing 833 from both ends but maintain a clearance fit; the oil plug 835 is used to assemble and position the outer bearing 833 and the inner bearing 831 on the one hand, and cooperates with the self-priming hole 832 on the other hand to flow out of the oil hole with a certain clearance; the fitting clearance between the through hole on the sleeve 836 and the imbrication group 837, the fitting clearance between the outer bearing 833 and the inner bearing 831, and the fitting clearance between the oil plug 835 and the self-priming hole 832 are connected, and the end sealing effect of the sealing end cover 84 is added to form an effective oil film supply and consumption system; therefore, a corresponding negative pressure can be generated when balancing the axial load of the rotating shaft 4, and the negative pressure can make a part of the hydraulic oil stored in the hydraulic buffer 85 enter the imbrication group 837, and then enter the through hole, the self-priming hole 832 and the surface of the rotating shaft 4 in turn, thereby ensuring the balancing performance of the rotating shaft 4 during continuous operation.

[0046] Furthermore, the stacked bearing group 837 provided by the present invention includes a plurality of axially distributed disc-shaped bearings 8371, and disc-shaped grooves are arranged on the bearing surfaces on both sides of the disc-shaped bearing 8371. The disc-shaped bearing 8371 has a certain oil storage space when stacked front and back. At the same time, the bearing edge of the disc-shaped bearing 8371 is V-shaped. In this way, the hydraulic oil sucked into the balance ring group 82 from the hydraulic buffer 85 can be pressure-assisted to enter the space where the disc-shaped bearing 8371 is located, pass through the V-shaped end of the disc-shaped bearing 8371 and enter between the disc-shaped bearings 8371, preparing for the hydraulic oil to enter the outer bearing 833 and the inner bearing 831.

[0047] In order to improve the synchronization between the inner bearing 831 and the outer bearing 833, the ends of the inner bearing 831 and the outer bearing 833 provided by the present invention are provided with countersunk annular grooves 839, and the two ends of the inner bearing 831 and the outer bearing 833 are provided with pressure caps 838 that match the countersunk annular grooves 839, and the pressure caps 838 are provided with screw holes and screws for connecting the inner bearing 831 and the outer bearing 833, and the screws connect the inner bearing 831 and the outer bearing 833. In this way, the front and rear relative positions of the inner bearing 831 and the outer bearing 833 can be effectively limited by the pressure caps 838 in the directions of the two ends, which is conducive to ensuring the assembly reliability of the two ends of the self-priming hydraulic balance bearing assembly 83 and the front-stage impeller 63 and the rear-stage impeller 53, and can appropriately reduce the shear force at the root of the oil plug 835, thereby ensuring that there is an appropriate margin in the self-priming hole 832 to suck in the hydraulic oil and supply it to the rotating side of the shaft 4.

[0048] In order to improve the buffering performance of the hydraulic buffer 85, the hydraulic buffer 85 provided by the present invention includes a flange plate 851 connected to a flange seat 86 arranged on the outside of the sleeve 81, an outer cylinder sleeve 852 is arranged on the flange plate 851, an inner tube 853 is concentrically arranged inside the outer cylinder sleeve 852, a pressure shaft 854 axially movably nested with the inner tube 853 is arranged at the center of the outer cylinder sleeve 852, an inner ring groove is arranged inside the pressure shaft 854, a first spring 855 is arranged between the inner ring groove and the inner tube 853, an oil channel 856 is arranged at the center of the pressure shaft 854, a T-shaped pressure oil nozzle 857 is arranged at the end of the oil channel 856, and the pressure oil nozzle 857 is provided with an oil nozzle hole 858 on its side away from the inner tube 853. In this way, the three hydraulic buffers 85 are installed at three positions of the sleeve 81 through the flange plate 851 and the flange seat, and form a symmetrical relationship. When the two moving rings 822 of the balance ring group 82 produce dynamic amplitude changes, the pressure shaft 854 can produce dynamic contraction. The hydraulic pressure inside the hydraulic buffer 85 and the action of the first spring 855 can cause the moving ring 822 to recover to the original balance direction, thereby obtaining dynamic balance. Regarding the hydraulic oil inside the hydraulic buffer 85, a part of it is compressed from the inner tube 853 to the oil channel 856 during the contraction of the pressure shaft 854, and then enters the matching cavity of the moving ring 822 from the direction of the oil nozzle hole 858 through the pressure oil nozzle 857. In the process of continuous dynamic balance, the hydraulic oil can gradually enter the working chamber of the self-priming hydraulic balance bearing assembly 83, thereby realizing the automatic supply and consumption of the oil film on the side of the rotating shaft 4.

[0049] Furthermore, the present invention has a second spring 859 sleeved on the pressure oil nozzle 857, and the second spring 859 is connected to the oil channel 856, so that the pressure oil nozzle 857 also has appropriate elastic expansion and contraction performance at the end of the pressure shaft 854. During the automatic balancing of the pressure shaft 854, the pressure oil nozzle 857 also contracts appropriately, and in the balanced state, the position of the oil nozzle hole 858 is close to the inner wall of the oil channel 856, and no excess hydraulic oil is supplied in large quantities. In the process of dynamic balancing, the oil nozzle hole 858 protrudes slightly relative to the end of the pressure shaft 854, so as to facilitate the supply of oil to the two balance ring groups 82 at the position of the oil nozzle hole 858.

[0050] In order to improve the uniformity of the distribution of the oil output from the pressure oil nozzle 857, the present invention provides at least two oil nozzle holes 858 on the pressure oil nozzle 857, which are respectively facing the two balance ring groups 82. This can improve the uniformity of the hydraulic oil entering the two balance ring groups 82 in the same working environment, thereby ensuring the autonomous supply of pressure between the shingle groups 837.

[0051] In order to facilitate the assembly of the balance ring group 82, the sleeve 81 provided by the present invention includes an upper sleeve and a lower sleeve, and the upper sleeve and the lower sleeve are butt-jointed, so the balance groove 811 used to assemble the balance ring group 82 is also butt-jointed up and down. Before butt-jointing, the balance ring group 82 is installed in the lower sleeve, and then the upper sleeve is assembled.

[0052] In order to improve the integrity and sealing of the device, the outer sides of the front-stage pump 6, the balancing spacer and the back-stage pump 5 provided by the present invention are all provided with connecting ears 9, and the front and rear connecting ears 9 facing each other are connected by anti-detachment bolts 10.

[0053] The above description is only a preferred embodiment of the present invention and does not limit the present invention in other forms. Any technician familiar with the profession may use the technical content disclosed above to change or modify it into an equivalent embodiment with equivalent changes and apply it to other fields. However, any simple modification, equivalent change and modification made to the above embodiment based on the technical essence of the present invention without departing from the content of the technical solution of the present invention still falls within the protection scope of the technical solution of the present invention.

Claims

1. A self-balancing multi-stage liquid ring compressor, comprising a base (1), wherein a motor (2) is arranged on the base (1), a coupling (3), a rotating shaft (4), a rear-stage pump (5) and a front-stage pump (6) are arranged at the power output end of the motor (2), the front-stage pump (6) is provided with a first-stage air intake port (61) and a first-stage air exhaust port (62) and a front-stage impeller (63) is arranged inside the front-stage pump (6), the rear-stage pump (5) is provided with a second-stage air intake port (51) and a second-stage air exhaust port (52) and a rear-stage impeller (53) is arranged inside the rear-stage pump (5), the first-stage air exhaust port (62) is connected to the second-stage air intake port (51) by a connecting pipe (7), and the front and rear support assemblies are arranged at both ends of the front and rear pumps (6 and 5), characterized in that: A self-balancing spacer (8) is arranged between the front-stage pump (6) and the rear-stage pump (5), the self-balancing spacer (8) comprising a sleeve (81), the sleeve (81) having an eccentric mounting hole arranged therein, the sleeve (81) having two axially spaced balancing grooves (811) arranged therein, a balancing ring group (82) arranged in the balancing groove (811), the balancing ring group (82) having an eccentric shaft hole (821) corresponding to the mounting hole, a self-priming hydraulically balanced bearing bush assembly (83) arranged in the eccentric shaft hole (821), The self-priming hydraulic balance bearing assembly (83) is used to balance the axial load and establish an oil film system that flexibly cooperates with the rotating shaft (4). The two ends of the self-priming hydraulic balance bearing assembly (83) cooperate with the countersunk grooves arranged at the ends of the front-stage impeller (63) and the rear-stage impeller (53). The two end surfaces of the sleeve (81) are provided with sealing end covers (84). The outer side of the sleeve (81) is provided with three hydraulic buffers (85) distributed in a herringbone shape. The pressure end of the hydraulic buffer (85) radially extends toward and contacts the circumferential side of the balance ring assembly (82). The self-priming hydraulically balanced bearing assembly (83) comprises two axially butted inner bearings (831), the side of the inner bearings (831) being provided with a plurality of radial self-priming holes (832), the outer side of the inner bearings (831) being provided with an annular groove, an outer bearing (833) being provided in the annular groove of the two inner bearings (831), the outer bearing (833) being provided with a plurality of countersunk holes (834) corresponding to the self-priming holes (832), the countersunk holes (834) being provided with oil plugs (835), the ends of the oil plugs (835) being connected to the To the self-priming hole (832), the hole diameter of the self-priming hole (832) is larger than the end diameter of the oil plug (835), the outer side of the outer bearing (833) is provided with a shaft sleeve (836), the side of the shaft sleeve (836) is provided with a plurality of through holes, the cross section of the shaft sleeve (836) is in a T-shaped structure, the T-shaped end of the shaft sleeve (836) is movably matched with the eccentric shaft hole (821), and the two sides of the T-shaped shaft sleeve (836) are provided with shingle groups (837), and the shaft sleeve (836) and the shingle group (837) are axially movably matched.

2. A self-balancing multi-stage liquid ring compressor according to claim 1, characterized in that: The balancing ring group (82) comprises two moving rings (822), wherein the top end of one of the moving rings (822) is provided with a movable groove (823) which overlaps with the other moving ring (822) in front and back, and the bottom end of one of the moving rings (822) is provided with a wedge surface (824) which forms a V-shaped opening with the other moving ring (822), and the outer ring side of the moving ring (822) is provided with a semi-lunar pressure groove (825), and an arc-shaped compression spring (826) is provided in the pressure groove (825), and one end of the compression spring (826) is a fixed end and the other end thereof faces the inner groove surface of the balancing groove (811).

3. A self-balancing multi-stage liquid ring compressor according to claim 2, characterized in that: The tile group (837) includes a plurality of axially distributed disc-shaped tiles (8371), and the tile surfaces on both sides of the disc-shaped tiles (8371) are provided with disc-shaped grooves, and the tile edges of the disc-shaped tiles (8371) are V-shaped.

4. A self-balancing multi-stage liquid ring compressor according to claim 3, characterized in that: The ends of the inner bearing (831) and the shaft sleeve (836) are provided with countersunk ring grooves (839), and the two ends of the inner bearing (831) and the shaft sleeve (836) are provided with pressure covers (838) that match the countersunk ring grooves (839).

5. A self-balancing multi-stage liquid ring compressor according to claim 1, characterized in that: The hydraulic buffer (85) includes a flange plate (851) connected to a flange seat (86) arranged on the outer side of the sleeve (81); an outer cylinder sleeve (852) is arranged on the flange plate (851); an inner tube (853) is concentrically arranged inside the outer cylinder sleeve (852); a pressure shaft (854) is arranged at the center of the outer cylinder sleeve (852) and is axially movably nested with the inner tube (853); an inner ring groove is arranged inside the pressure shaft (854); a first spring (855) is arranged between the inner ring groove and the inner tube (853); an oil channel (856) is arranged at the center of the pressure shaft (854); a T-shaped pressure oil nozzle (857) is arranged at the end of the oil channel (856); and the pressure oil nozzle (857) is provided with an oil nozzle hole (858) at a side position away from the inner tube (853).

6. A self-balancing multi-stage liquid ring compressor according to claim 5, characterized in that: The pressure oil nozzle (857) is sleeved with a second spring (859), and the second spring (859) is connected to the oil channel (856).

7. A self-balancing multi-stage liquid ring compressor according to claim 6, characterized in that: There are at least two oil nozzle holes (858) on the pressure oil nozzle (857), and the holes are respectively facing two balancing ring groups (82).

8. A self-balancing multi-stage liquid ring compressor according to claim 1, characterized in that: The sleeve (81) comprises an upper sleeve and a lower sleeve, and the upper sleeve and the lower sleeve are butt-jointed.

9. A self-balancing multi-stage liquid ring compressor according to claim 1, characterized in that: The outer sides of the front-stage pump (6), the self-balancing spacer and the rear-stage pump (5) are all provided with connecting ears (9), and the front and rear connecting ears (9) facing each other are connected by anti-drop bolts (10).

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