CN109340138B

CN109340138B - Hydraulic suspension oil pump

Info

Publication number: CN109340138B
Application number: CN201811222015.7A
Authority: CN
Inventors: 陈文联; 张龙波; 林正林; 黎贤钛; 张其强
Original assignee: Zhejiang ERG Technology Inc
Current assignee: Zhejiang ERG Technology Inc
Priority date: 2018-10-19
Filing date: 2018-10-19
Publication date: 2020-06-30
Anticipated expiration: 2038-10-19
Also published as: CN109340138A

Abstract

The invention provides a hydraulic suspension oil pump, and belongs to the technical field of oil pumps. It has solved the current unstable problem of oil pump operation. This hydraulic suspension oil pump includes the casing, be equipped with pivot and impeller in the casing, the impeller links firmly the link in the pivot, the axial passageway that runs through has in the pivot, the circulation passageway has in the impeller, the oil inlet is linked together with the oil-out through axial passageway and circulation passageway, the mount pad has in the casing, link firmly the first stabilizing member that is used for fixing a position the impeller on the mount pad, first lubrication channel has between first stabilizing member and the impeller, balanced chamber has between impeller and the mount pad, balanced chamber is linked together through the inner chamber of first lubrication channel with the casing, the center department of impeller has the pressure release hole that makes balanced chamber and circulation passageway entrance point be linked together, the balancing hole that makes balanced chamber and oil-out be linked together has in the mount pad. The hydraulic suspension oil pump has the advantages of stable and reliable operation and long service life.

Description

Hydraulic suspension oil pump

Technical Field

The invention belongs to the technical field of oil pumps, and relates to a hydraulic suspension oil pump.

Background

The existing transformer oil pump usually adopts an oil-submersible mode, and comprises a disc type motor oil pump, a three-phase asynchronous motor oil pump and the like, wherein the disc type motor oil pump usually adopts a radial impeller, and the three-phase asynchronous motor oil pump can adopt a radial impeller, an axial impeller and the like. In any type of oil pump, the rotary members of the rotor and the impeller are supported by bearings.

Because the oil pump motor is soaked in oil, the operating environment is very good, and the service life of the oil pump motor is infinite, the service life of the oil pump is the service life of the bearing. The transformer oil pump usually adopts deep groove ball bearings, the theoretical calculated value of the design of the service life of the bearings is more than 10 years, but because the oil pump runs, the bearings can be impacted by the radial and axial uneven loads of the impeller, and microparticles in the oil and the like are adhered to the bearings, so that the movement of the bearings is hindered, the aging and damage of the bearings are accelerated, the bearings of the oil pump can be out of work earlier, the oil pump can not work normally, and the safe running of the transformer can be endangered by a series of problems of oil quality degradation, metal particles and the like.

Disclosure of Invention

The invention aims to provide a hydraulic suspension oil pump aiming at the problems in the prior art, and solves the technical problem of how to ensure that the oil pump runs stably and reliably and the service life is prolonged.

The purpose of the invention can be realized by the following technical scheme: a hydraulic suspension oil pump comprises a shell with an oil inlet and an oil outlet, wherein a stator, a rotor, a rotating shaft and an impeller are arranged in the shell, the rotating shaft is arranged in the rotor in a penetrating way and is fixedly connected with the rotor, the impeller is fixedly connected with the connecting end of the rotating shaft, it is characterized in that the rotating shaft is provided with a through axial channel, the impeller is provided with a flow channel, the oil inlet is communicated with the oil outlet through an axial channel and a circulation channel, the shell is internally provided with a mounting seat, the mounting seat is fixedly connected with a first stabilizing piece for positioning the impeller, a first lubricating channel is arranged between the first stabilizing piece and the impeller, a balance cavity is arranged between the impeller and the mounting seat, the balance cavity is communicated with the inner cavity of the shell through a first lubricating channel, the center of the impeller is provided with a pressure relief hole which enables the balance cavity to be communicated with the inlet end of the circulation channel, and the mounting seat is internally provided with a balance hole which enables the balance cavity to be communicated with the oil outlet.

This hydraulic suspension oil pump during operation, the rotation of rotor can drive pivot and impeller rotation, and oil gets into from the oil inlet, flows along axial passage and circulation channel, and along with the rotation of impeller, oil is thrown away and flows to the oil-out. The arrangement of the first lubricating channel enables an oil film to be arranged between the impeller and the first stabilizing piece, and through the buffering and lubricating effects of the oil film, the radial jumping force generated during rotation of the impeller is relieved, and radial contact friction is avoided. The inner cavity of the oil outlet of the shell, the balance cavity and the oil inlet end of the circulation channel are communicated through the pressure relief hole and the balance hole, when the hydraulic suspension oil pump starts to operate, the impeller rotates, a high-pressure oil flow part instantaneously generated at the outlet end of the impeller circulation channel flows back to the inlet end of the impeller circulation channel through the first lubricating channel, the balance cavity and the pressure relief hole, oil at the oil outlet of the shell and oil in the balance cavity can mutually circulate through the balance hole, so that the pressure difference of the oil at each part of the inner cavity of the shell is kept in a balanced state, or the pressure difference at each part is very small, therefore, when the hydraulic suspension oil pump works, the axial force generated when the impeller operates is small enough, the axial force of an oil film generated between the impeller and the first stabilizing part and the axial force generated by the impeller can be easily. When the hydraulic suspension oil pump operates, the rotor, the rotating shaft and the impeller are all in a suspension state, the hydraulic suspension oil pump is bearingless, and has no mechanical contact, namely, the problem of non-contact friction loss, so that the hydraulic suspension oil pump operates stably and reliably, has low vibration and noise, and various parts have long service life, thereby prolonging the service life of the hydraulic suspension oil pump.

In the hydraulic suspension oil pump, the pressure relief hole and the balance hole are both located on a central axis of the axial channel. The structure enables the oil in each part of the inner cavity of the shell to flow more smoothly and rapidly, and enables the oil in each part of the inner cavity of the shell to be balanced better, so that the hydraulic suspension oil pump is stable and reliable in operation, and the service life of the hydraulic suspension oil pump is prolonged.

In the hydraulic suspension oil pump, the flow cross-sectional area of the pressure relief hole is 1-2 times the sum of the flow cross-sectional area of the balance hole and the flow cross-sectional area of the first lubricating channel. This kind of structure makes the pressure differential of the entrance point of impeller circulation passageway and balanced chamber department as far as possible little and can not produce the bubble, and the axial force that makes this hydraulic suspension oil pump operation impeller production is enough little, makes the axial force that the oil film between impeller and the first stabilizing piece produced and the axial force that the impeller produced reach stable equilibrium easily, avoids axial contact friction, improves stability, improves life.

In foretell hydraulic suspension oil pump, first stabilizing member is the annular, first stabilizing member has the equidistant first rectangle that sets up of a plurality of and be the cuboid form to lead to the oil groove on the terminal surface of impeller, it leads to the oil groove to have to be the first spiral of spiral on the inside wall of first stabilizing member, first lubricated passageway includes that first rectangle leads to the oil groove, first spiral leads to the oil groove and the clearance between first stabilizing member and the impeller. The first rectangular oil through groove guarantees a certain flow cross-sectional area, certain oil is stored between the impeller and the first stabilizing part, the first spiral oil through groove guarantees that the oil film of the oil is uniform and stable when certain oil is stored between the impeller and the first stabilizing part, the stability of the oil film is improved, and therefore the stability of a rotor, a rotating shaft and the impeller when rotating is improved, the oil pump cannot be in mechanical contact due to the arrangement of gaps, the operation is stable and reliable, the service life is prolonged, and the gap interval is 0.12mm-0.18 mm.

In foretell hydraulic suspension oil pump, link firmly first wear-resisting cover on the impeller, first wear-resisting cover is located between impeller and the first stabilizing member, first wear-resisting cover and first stabilizing member phase-match, have the clearance between first wear-resisting cover and the first stabilizing member. First wear-resisting cover is stand wear and tear, and the setting of first wear-resisting cover plays the effect of keeping apart impeller and first stabilizer, prevents that the impeller from being worn and torn, improves the stability of rotor, pivot and impeller when rotatory, makes the operation of oil pump reliable and stable, increase of service life.

In the hydraulic suspension oil pump, an annular pressure stabilizing cavity is further arranged between the impeller and the mounting seat, the inner side of the pressure stabilizing cavity is communicated with the balance cavity through a first lubricating channel, and the outer side of the pressure stabilizing cavity is communicated with the inner cavity of the shell through a gap between the mounting seat and the impeller. The pressure stabilizing cavity is matched with the balance cavity, the pressure stabilizing cavity plays a role in auxiliary balance, oil between the impeller and the mounting seat is more due to the arrangement of the pressure stabilizing cavity, the pressure of the two sides of the impeller is balanced when the impeller rotates, the stability of the rotor, the rotating shaft and the impeller is good when the rotor, the rotating shaft and the impeller rotate, the operation of the oil pump is stable and reliable, and the service life is prolonged.

In the hydraulic suspension oil pump, the connection part between the outer side of the pressure stabilizing cavity and the inner cavity of the shell through the gap is located at the outlet end of the circulation channel. The structure enables oil to flow more rapidly, enables the oil at each part in the inner cavity of the shell to be balanced more rapidly, and enables the balancing effect to be better.

In foretell a hydraulic suspension oil pump, the mount pad has the first groove of recessed setting towards one side of impeller, the balancing hole sets up the center department at first groove tank bottom, the impeller has the second groove of recessed setting towards the center department of mount pad one side, the pressure release hole sets up the center department at second groove tank bottom, the pressure release hole is just to axial passageway, first groove and second groove form balanced chamber. The space is reasonably utilized, and the total is reasonable.

In foretell hydraulic suspension oil pump, link firmly the second stabilizing member in the casing, the second stabilizing member links to each other with leaning on the end of pivot, just second lubricating channel has between second stabilizing member and the pivot. The second lubricating channel is arranged to enable an oil film to be arranged between the rotating shaft and the second stabilizing piece, through the buffering and lubricating effects of the oil film, the radial jumping force generated when the rotating shaft rotates is relieved, radial contact friction is avoided, the stability of the rotor, the rotating shaft and the rotor when the rotating shaft and the impeller rotate is improved, the operation of the oil pump is stable and reliable, and the service life is prolonged.

In foretell hydraulic suspension oil pump, the second stabilizator is the annular, the second stabilizator has a plurality of equidistant setting and is the second rectangle oil groove that leads to of rectangular form on the terminal surface of impeller, have on the inside wall of second stabilizator and be spiral second spiral oil groove that leads to, the bar oil groove that leads to that still has a plurality of interval setting on the inside wall of second stabilizator, the bar oil groove that leads to communicates with the second spiral oil groove mutually, the bar oil groove that leads to and the oil groove one-to-one setting of second rectangle, just the bar oil groove that leads to communicates with the second rectangle oil groove that corresponds mutually, the second lubricated passageway includes that the second rectangle leads to oil groove, second spiral oil groove, the bar leads to the oil groove and the second stabilizator and the wear-resisting clearance of second between the cover. The oil groove is led to the second rectangle, certain circulation cross-sectional area is guaranteed to the bar oil groove, certain fluid has between messenger's pivot and the second stabilizing member, the second spiral leads to the oil groove and guarantees to make the fluid oil film even steady when having certain fluid between pivot and the second stabilizing member, improve the stability of oil film, thereby improve the stability when rotor, pivot and impeller are rotatory, the setting up in clearance makes this oil pump can not take place mechanical contact, the operation is reliable and stable, increase of service life, the clearance interval is between 0.12mm-0.18 mm.

In foretell hydraulic suspension oil pump, the support of pivot is served and is linked firmly the wear-resisting cover of second, the wear-resisting cover of second is located between pivot and the second stabilizing member, the wear-resisting cover of second and second stabilizing member phase-match, have the clearance between wear-resisting cover of second and the second stabilizing member. The wear-resisting cover of second is antifriction, and the setting of the wear-resisting cover of second plays the effect of keeping apart pivot and second stabilizing member, prevents that the impeller from being worn and torn, improves the stability of rotor, pivot and impeller when rotatory, makes the operation of oil pump reliable and stable, increase of service life.

Compared with the prior art, the hydraulic suspension oil pump provided by the invention has the following advantages:

1. the hydraulic suspension oil pump can relieve the force of radial runout generated when the rotating shaft and the impeller rotate, so that the pressure difference of oil liquid in each part of the inner cavity of the shell is kept in a balanced state, or the pressure difference in each part is very small, thereby the axial force generated when the impeller operates in the working process of the hydraulic suspension oil pump is small enough, the axial contact friction is avoided, the oil pump has no bearing and no mechanical contact, the hydraulic suspension oil pump operates stably and reliably, the vibration is low, the noise is low, the service life of various parts is long, and the service life of the hydraulic suspension oil pump is prolonged.

2. This hydraulic suspension oil pump's first wear-resisting cover, the wear-resisting cover of second, first stabilizing member and second stabilizing member all do not have magnetism, are difficult for adhesion impurity promptly, make the oil film in first lubricated passageway and the lubricated passageway of second difficult quilt destroy to make this hydraulic suspension oil pump operation reliable and stable, improve life.

Drawings

Fig. 1 is a sectional view of the overall structure of the present hydraulic suspension oil pump.

Fig. 2 is a schematic view of the overall structure of the first stabilizer of the present hydrodynamic suspension oil pump.

Fig. 3 is a schematic view of the overall structure of the second stabilizer of the present hydrodynamic suspension oil pump.

In the figure, 1, a housing; 101. an oil inlet; 102. an oil outlet; 2. a stator; 3. a rotor; 4. a rotating shaft; 41. a connecting end; 42. an axial channel; 43. an abutting end; 5. an impeller; 51. a flow-through channel; 52. a pressure relief vent; 6. a mounting seat; 61. a balance hole; 7. a first stabilizer; 71. a first rectangular oil through groove; 72. a first spiral oil through groove; 8. a first lubrication channel; 9. a balancing chamber; 91. a first groove; 92. a second groove; 10. a first wear sleeve; 11. a voltage stabilizing cavity; 12. a second stabilizer; 121. a second rectangular oil through groove; 122. a second spiral oil through groove; 123. a strip-shaped oil through groove; 13. a second lubrication channel; 14. a second wear sleeve.

Detailed Description

The following are specific embodiments of the present invention and are further described with reference to the drawings, but the present invention is not limited to these embodiments.

As shown in fig. 1, the present hydrodynamic levitation oil pump includes a housing 1, a stator 2, a rotor 3, a rotating shaft 4, an impeller 5, a mount 6, a first stabilizer 7, and a second stabilizer 12.

The one end of casing 1 is oil inlet 101, the other end of casing 1 is oil-out 102, stator 2, rotor 3, pivot 4 and impeller 5 all establish in casing 1, stator 2 links firmly in casing 1, rotor 3 wears to establish in stator 2, pivot 4 wears to establish in rotor 3 and links firmly mutually with rotor 3, impeller 5 links firmly the link 41 at pivot 4, rotor 3 can be rotatory in stator 2 after the circular telegram, rotor 3 rotatory ability drives pivot 4 and impeller 5 rotatory.

The casing 1 is internally provided with a mounting seat 6, the mounting seat 6 is fixedly connected with a first stabilizing part 7 through interference tight fit, the casing 1 is fixedly connected with a second stabilizing part 12 through interference tight fit, the impeller 5 is fixedly connected with a first wear-resistant sleeve 10, the first wear-resistant sleeve 10 is positioned between the impeller 5 and the first stabilizing part 7, the first wear-resistant sleeve 10 is matched with the first stabilizing part 7, and a first lubricating channel 8 is arranged between the first stabilizing part 7 and the first wear-resistant sleeve 10. The abutting end 43 of the rotating shaft 4 is fixedly connected with a second wear-resistant sleeve 14, the second wear-resistant sleeve 14 is located between the rotating shaft 4 and the second stabilizing member 12, the second wear-resistant sleeve 14 is matched with the second stabilizing member 12, and a second lubricating channel 13 is arranged between the second stabilizing member 12 and the second wear-resistant sleeve 14.

As shown in fig. 2, the first stabilizer 7 is ring-shaped, in this embodiment, the end surface of the first stabilizer 7 facing the impeller 5 has four first rectangular oil through grooves 71 which are equally spaced and are rectangular, in practical production, the number of the first rectangular oil through grooves 71 may be three or eight, the inner side wall of the first stabilizer 7 has a first spiral oil through groove 72 which is spiral, and the first spiral oil through groove 72 is right-handed, and the first lubrication channel 8 includes the first rectangular oil through groove 71, the first spiral oil through groove 72 and a gap between the first stabilizer 7 and the first wear-resistant sleeve 10.

As shown in fig. 3, the second stabilizing member 12 is ring-shaped, and the inner side wall of the second stabilizing member 12 has a second spiral oil through groove 122 in a spiral shape, in this embodiment, the end surface of the second stabilizing member 12 facing the impeller 5 has eight second rectangular oil through grooves 121 which are equally spaced and are rectangular, and the inner side wall of the second stabilizing member 12 also has eight strip oil through grooves 123 which are spaced, and in actual production, the number of the second rectangular oil through grooves 121 and the number of the strip oil through grooves 123 may be four or twelve. Oil groove 123 is led to the bar and is linked together with second spiral leads to oil groove 122, and oil groove 123 is led to the bar and second rectangle leads to oil groove 121 one-to-one setting, and oil groove 123 is led to the bar and the second rectangle that corresponds leads to oil groove 121 and is linked together, and second lubrication channel 13 includes that the second rectangle leads to oil groove 121, second spiral leads to oil groove 122, the bar leads to oil groove 123 and second stabilizer 12 and the wear-resisting cover 14 clearance of second between.

The rotating shaft 4 is provided with a through axial passage 42, the impeller 5 is provided with a circulating passage 51, and the oil inlet 101 is communicated with the oil outlet 102 through the axial passage 42 and the circulating passage 51. The side of the mounting seat 6 facing the impeller 5 is provided with a first groove 91 which is concavely arranged, the center of the bottom of the first groove 91 is provided with a balance hole 61, the center of the side of the impeller 5 facing the mounting seat 6 is provided with a second groove 92 which is concavely arranged, the center of the bottom of the second groove 92 is provided with a pressure relief hole 52, and the first groove 91 and the second groove 92 form a balance cavity 9, namely the balance cavity 9 is arranged between the impeller 5 and the mounting seat 6. An annular pressure stabilizing cavity 11 is further arranged between the impeller 5 and the mounting seat 6, the inner side of the pressure stabilizing cavity 11 is communicated with the balance cavity 9 through a first lubricating channel 8, the outer side of the pressure stabilizing cavity 11 is communicated with the inner cavity of the shell 1 through a gap between the mounting seat 6 and the impeller 5, and the communicated position is located at the outlet end of the circulation channel 51.

The relief hole 52 connects the balance chamber 9 to the inlet end of the flow-through passage 51, the relief hole 52 faces the axial passage 42, the balance hole 61 connects the balance chamber 9 to the oil outlet 102, and both the relief hole 52 and the balance hole 61 are located on the central axis of the axial passage 42. In this embodiment, the flow cross-sectional area of the pressure relief hole 52 is 1.5 times the sum of the flow cross-sectional area of the balance hole 61 and the flow cross-sectional area of the first lubrication passage 8, and in actual production, the flow cross-sectional area of the pressure relief hole 52 is one or two times the sum of the flow cross-sectional area of the balance hole 61 and the flow cross-sectional area of the first lubrication passage 8.

When the hydraulic suspension oil pump works, the rotation of the rotor 3 can drive the rotating shaft 4 and the impeller 5 to rotate, oil enters from the oil inlet 101, flows along the axial channel 42 and the circulation channel 51, and is thrown out and flows to the oil outlet 102 along with the rotation of the impeller 5. In the process, part of oil flows through the second lubricating passage 13, part of the oil enters the pressure stabilizing cavity 11 through a gap between the impeller 5 and the mounting seat 6 and then enters the balance cavity 9 through the first lubricating passage 8, part of the oil at the oil outlet 102 in the shell 1 enters the balance cavity 9 through the balance hole 61, or enters the oil outlet 102 in the shell 1 from the balance cavity 9 through the balance hole 61, and the oil in the balance cavity 9 enters the circulation passage 51 through the pressure relief hole 52, so that the oil in the inner cavity of the shell 1 can circulate mutually, the pressure of the oil in the inner cavity of the shell 1 is kept balanced or the pressure difference is smaller, particularly the pressure at two sides of the impeller 5 is kept balanced.

The specific embodiments described herein are merely illustrative of the spirit of the invention. Various modifications or additions may be made to the described embodiments or alternatives may be employed by those skilled in the art without departing from the spirit or ambit of the invention as defined in the appended claims.

Although the terms of the housing 1, the oil inlet 101, the oil outlet 102, the stator 2, the rotor 3, the rotating shaft 4, the connecting end 41, the axial passage 42, the abutting end 43, the impeller 5, the circulating passage 51, the pressure relief hole 52, the mounting seat 6, the balance hole 61, the first stabilizer 7, the first rectangular oil through groove 71, the first spiral oil through groove 72, the first lubricating passage 8, the balance cavity 9, the first groove 91, the second groove 92, the first wear-resistant sleeve 10, the pressure stabilizing cavity 11, the second stabilizer 12, the second rectangular oil through groove 121, the second spiral oil through groove 122, the strip oil through groove 123, the second lubricating passage 13, the second wear-resistant sleeve 14, and the like are used more herein, the possibility of using other terms is not excluded. These terms are used merely to more conveniently describe and explain the nature of the present invention; they are to be construed as being without limitation to any additional limitations that may be imposed by the spirit of the present invention.

Claims

1. A hydraulic suspension oil pump comprises a shell (1) with an oil inlet (101) and an oil outlet (102), wherein a stator (2), a rotor (3), a rotating shaft (4) and an impeller (5) are arranged in the shell (1), the rotating shaft (4) penetrates through the rotor (3) and is fixedly connected with the rotor (3), the impeller (5) is fixedly connected with a connecting end (41) of the rotating shaft (4), the hydraulic suspension oil pump is characterized in that the rotating shaft (4) is internally provided with a through axial channel (42), the impeller (5) is internally provided with a circulating channel (51), the oil inlet (101) is communicated with the oil outlet (102) through the axial channel (42) and the circulating channel (51), the shell (1) is internally provided with a mounting seat (6), the mounting seat (6) is fixedly connected with a first stabilizing piece (7) for positioning the impeller (5), and a first lubricating channel (8) is arranged between the first stabilizing piece (7) and the impeller (5), a balance cavity (9) is arranged between the impeller (5) and the mounting seat (6), the balance cavity (9) is communicated with an inner cavity of the shell (1) through a first lubricating channel (8), a pressure relief hole (52) enabling the balance cavity (9) to be communicated with an inlet end of the circulating channel (51) is formed in the center of the impeller (5), and a balance hole (61) enabling the balance cavity (9) to be communicated with the oil outlet (102) is formed in the mounting seat (6).

2. A pump according to claim 1, wherein the relief hole (52) and the balancing hole (61) are located on the central axis of the axial channel (42).

3. A hydrodynamic float oil pump according to claim 1, characterized in that the flow cross-sectional area of the pressure relief opening (52) is 1-2 times the sum of the flow cross-sectional area of the balancing opening (61) and the flow cross-sectional area of the first lubricating channel (8).

4. The hydrodynamic suspension oil pump according to claim 1, 2 or 3, characterized in that the first stabilizer (7) is ring-shaped, the end surface of the first stabilizer (7) facing the impeller (5) has a plurality of first rectangular oil through grooves (71) which are equally spaced and are rectangular, the inner side wall of the first stabilizer (7) has a first spiral oil through groove (72) which is spiral, and the first lubrication channel (8) comprises the first rectangular oil through groove (71), the first spiral oil through groove (72) and a gap between the first stabilizer (7) and the impeller (5).

5. A hydrodynamic suspension oil pump according to claim 4, characterized in that the impeller (5) has attached to it a first wear sleeve (10), the first wear sleeve (10) being located between the impeller (5) and the first stabilizer (7), the first wear sleeve (10) matching the first stabilizer (7), the first wear sleeve (10) and the first stabilizer (7) having a gap therebetween.

6. The hydraulic suspension oil pump as claimed in claim 1, 2 or 3, characterized in that an annular pressure stabilizing cavity (11) is further arranged between the impeller (5) and the mounting seat (6), the inner side of the pressure stabilizing cavity (11) is communicated with the balance cavity (9) through a first lubricating channel (8), the outer side of the pressure stabilizing cavity (11) is communicated with the inner cavity of the casing (1) through a gap between the mounting seat (6) and the impeller (5), and the communication position is located at the outlet end of the flow passage (51).

7. A pump according to claim 1, 2 or 3, characterized in that the side of the mounting seat (6) facing the impeller (5) has a first recess (91) arranged in a recessed manner, the balancing hole (61) is arranged in the centre of the bottom of the first recess (91), the centre of the side of the impeller (5) facing the mounting seat (6) has a second recess (92) arranged in a recessed manner, the pressure relief hole (52) is arranged in the centre of the bottom of the second recess (92), the pressure relief hole (52) faces the axial passage (42), and the first recess (91) and the second recess (92) form the balancing chamber (9).

8. A pump according to claim 1, 2 or 3, characterized in that a second stabilizer (12) is fastened in the housing (1), the second stabilizer (12) being connected to the bearing end (43) of the rotor shaft (4), and that a second lubrication channel (13) is provided between the second stabilizer (12) and the rotor shaft (4).

9. The hydrodynamic suspension oil pump according to claim 8, wherein the second stabilizer (12) is annular, the end surface of the second stabilizer (12) facing the impeller (5) has a plurality of rectangular second rectangular oil through grooves (121) which are equally spaced and rectangular, the inner side wall of the second stabilizer (12) has a second spiral oil through groove (122) which is spiral, the inner side wall of the second stabilizer (12) further has a plurality of strip oil through grooves (123) which are spaced, the strip oil through grooves (123) are communicated with the second spiral oil through grooves (122), the strip oil through grooves (123) are arranged in one-to-one correspondence with the second rectangular oil through grooves (121), the strip oil through grooves (123) are communicated with the corresponding second rectangular oil through grooves (121), and the second lubrication channel (13) includes the second rectangular oil through grooves (121), The second spiral oil through groove (122), the strip oil through groove (123) and a gap between the second stabilizing piece (12) and the second wear-resistant sleeve (14).

10. A hydrodynamic float oil pump according to claim 9, characterized in that the abutting end (43) of the rotating shaft (4) is fixedly connected with a second wear sleeve (14), the second wear sleeve (14) is located between the rotating shaft (4) and the second stabilizer (12), the second wear sleeve (14) is matched with the second stabilizer (12), and a gap is provided between the second wear sleeve (14) and the second stabilizer (12).