CN113153802B

CN113153802B - Sealing device of gas compressor and turbocharger

Info

Publication number: CN113153802B
Application number: CN202010074764.0A
Authority: CN
Inventors: 谢正海; 曾斌; 赵肖龙
Original assignee: SAIC Motor Corp Ltd
Current assignee: SAIC Motor Corp Ltd
Priority date: 2020-01-22
Filing date: 2020-01-22
Publication date: 2022-08-16
Anticipated expiration: 2040-01-22
Also published as: CN113153802A

Abstract

The invention discloses a sealing device of a gas compressor and a turbocharger. The cover plate, the oil baffle plate and the spacer sleeve assembly are all installed on the side of the compressor, and the cover plate, the oil baffle plate and the spacer sleeve assembly are connected with one another to form a first space. The gas enters the first space through the flow guide plate of the oil baffle plate and forms a first gas bag, and the pressure generated by the first gas bag limits the lubricating oil flowing through the surface of the oil baffle plate body to leak into the compressor. First gas package is for saving the gas group in first space, because one side in first space is connected with the inlet port, when gaseous entering first space, will form gas group, also can form first gas package to because gaseous can generate pressure, the lubricating oil that produces through first gas package can restrict to flow through on the fender oil board body surface leaks to the compressor in, and then can improve sealing device's use reliability.

Description

Sealing device of gas compressor and turbocharger

Technical Field

The invention relates to the field of automobiles, in particular to a sealing device of a gas compressor and a turbocharger.

Background

The exhaust gas turbocharger mainly comprises a compressor, a turbine, an intermediate body assembly connecting two ends and the like, and comprises the following components as shown in figures 1-4: the gas compressor volute 1, the pressing bolt 2, the intermediate rotor assembly 3, the volute hoop 4 and the exhaust gas turbine box 5. The compressor volute 1 is fixedly arranged on an intermediate rotor assembly 3 through a pressing shell bolt 2, the waste gas turbine box 5 is connected with the intermediate rotor assembly 3 through a volute hoop 4, a cover plate 16 is fixedly connected on an intermediate body 13, a pressing wheel 15 is arranged on one side, far away from the intermediate body 13, of the cover plate 16, the cover plate 16 is arranged opposite to an oil baffle plate 14, and a first space A is formed; lubricating oil flows into each oil channel from the oil inlet 131 at the upper part of the middle body 13, reaches the thrust bearing 11 and the radial bearing 12, enters the first space A, and then flows out from the oil outlet 141 under the action of gravity. However, in the exhaust gas turbocharger with such a structure, the guide plate 142 is configured to be a planar plate-shaped structure, and in order to ensure that the oil baffle 14 has a sufficient oil sealing area, the guide plate 142 needs to be connected to a position close to the lower end of the oil baffle 14, which further causes a small area of the gas inlet passage, so that the gas in the crankcase cannot rapidly enter the first space a (i.e., when the area of the gas inlet passage is small, the gas passes through the passage and is delayed), and when the gas pressure P1 in the compressor is smaller than the gas pressure P3 in the first space a, due to the gas pressure difference, the lubricating oil accumulated in the first space a leaks into the compressor along the oil drainage path shown in fig. 4 under the action of the gas pressure difference.

Therefore, the compressor sealing device in the turbocharger in the prior art has the problem that lubricating oil is easy to leak.

Disclosure of Invention

The invention aims to solve the problem that a compressor sealing device in a turbocharger in the prior art is easy to leak oil. The invention provides a sealing device of a gas compressor and a turbocharger, which can reduce the risk of lubricating oil leakage.

In order to solve the above problems, embodiments of the present invention provide a sealing device for an air compressor, which is used for limiting lubricating oil from entering the air compressor, and includes a cover plate, an oil baffle plate, and a spacer sleeve assembly; wherein the content of the first and second substances,

the cover plate, the oil baffle plate and the spacing sleeve assembly are all arranged on the side of the compressor, and the cover plate, the oil baffle plate and the spacing sleeve assembly are connected with one another to form a first space; and the number of the first and second electrodes,

the oil baffle plate is provided with a body and a guide plate, the guide plate is fixedly connected to the body, the guide plate is of an inwards concave structure, and a notch of the inwards concave structure faces to one side far away from the body; and the guide plate extends towards the direction far away from the cover plate to form a gas inlet, gas is guided to enter the first space through the guide plate and form a first gas bag, and the lubricating oil flowing through the surface of the body is limited by the pressure generated by the first gas bag to leak into the compressor.

By adopting the technical scheme, the oil baffle plate in the embodiment is provided with the body and the guide plate, the guide plate is fixedly connected to the body, the guide plate is of an inwards concave structure, and a notch of the inwards concave structure faces to one side far away from the body; and the guide plate extends to form a gas inlet towards the direction far away from the cover plate, gas enters the first space through the guide plate and forms a first gas bag, the gas in the crankcase can more smoothly flow into the first space through the arrangement of the structure, the first gas bag is formed, and the lubricating oil flowing through the surface of the main body is limited by the pressure generated by the first gas bag to leak into the compressor. Which reduces the risk of leakage of lubricating oil.

In addition, the guide plate is arranged to be of a concave structure, so that lubricating oil can be drained into the oil return pipe as soon as possible under the action of gravity, and the risk that the lubricating oil leaks into the compressor due to the fact that the lubricating oil is retained in the inner cavity of the intermediate is avoided.

Further, another embodiment of the present invention provides a sealing device of a compressor, the spacer assembly including a spacer and a piston ring, wherein,

the spacer sleeve is sleeved on the turbine shaft in the compressor and is respectively sleeved in the cover plate and the body of the oil baffle plate, and the outer wall surface of the spacer sleeve is respectively connected with the cover plate and the body of the oil baffle plate; and the number of the first and second electrodes,

the spacer sleeve comprises a sleeve body and a flange, the sleeve body is provided with a head and a tail, the peripheral wall of the sleeve body is close to the position of the head and is provided with at least one piston ring groove, a piston ring is installed on the piston ring groove, the flange is arranged on the outer wall surface of the sleeve body and extends outwards in the radial direction of the sleeve body, the flange surrounds the sleeve body in the circumferential direction, and the flange is located on the axial direction of the sleeve body between the piston ring groove and the tail.

Adopt above-mentioned technical scheme, the spacer sleeve has head and afterbody including cover body and flange, cover body, and the position that is close to the head on the periphery wall of cover body is provided with at least one piston ring groove, and the piston ring is installed on piston ring groove, and the flange radially outwards extends along the cover body from the outer wall of cover body to encircle along the circumference of cover body, and the flange be located piston ring groove on the axis direction of cover body with between the afterbody. The arrangement of the piston ring can enable the spacer sleeve to be connected with the bottom of the cover plate more tightly, and further the reliability of the sealing device in the embodiment is better.

Further, another embodiment of the present invention provides a sealing device for a compressor, wherein an annular groove is formed on a periphery of one end of the flange close to the head, and a plurality of spiral grooves are formed on the flange at intervals along a circumferential direction of the annular groove; and each of the spiral grooves is located inside the annular groove in a radial direction of the flange, and one end of each of the spiral grooves communicates with the annular groove.

By adopting the technical scheme, the periphery of one end of the flange close to the head is provided with the annular groove, and the flange is provided with the plurality of spiral grooves at intervals along the circumferential direction of the annular groove. And each spiral groove is positioned on the inner side of the annular groove in the radial direction of the flange, one end of each spiral groove is communicated with the annular groove, the annular groove and the spiral grooves can be used for storing certain gas, and the pressure generated by the gas can limit engine oil from entering the air compressor.

Further, another embodiment of the present invention provides a sealing device for a compressor, wherein an opening is provided on the piston ring, and the opening is disposed opposite to an inner hole of the cover plate, so that a gap exists between the piston ring and the cover plate.

By adopting the technical scheme, the piston ring is provided with the opening, the opening is arranged opposite to the inner hole of the cover plate, so that a gap exists between the piston ring and the cover plate, and the gap is formed by arranging the opening opposite to the inner hole of the cover plate and does not mean a tiny axial gap and a tiny radial gap between the piston ring and the ring groove.

Further, another embodiment of the present invention provides a sealing device for a compressor, wherein an end surface of the flange having the annular groove is attached to a side surface of the cover plate, a second space is formed between the annular groove and the cover plate, gas from the other side of the cover plate enters the second space through the gap to form a second gas packet, and the flange rotates along with the turbine shaft so that pressure generated by the second gas packet limits leakage of lubricating oil to the sealing ring.

By adopting the technical scheme, the second space is formed between the annular groove and the cover plate, gas from the other side of the cover plate enters the second space through the gap to form the second gas bag, the flange rotates along with the turbine shaft to enable pressure generated by the second gas bag to limit lubricating oil to leak to the sealing ring, and the sealing device in the embodiment has better reliability due to the arrangement of the structure.

Further, another embodiment of the present invention provides a sealing device for a compressor, which further includes a thrust pad, wherein the thrust pad is fixedly connected to the turbine shaft and abuts against the tail of the spacer sleeve.

By adopting the technical scheme, the thrust backing plate can further position the spacer sleeve, so that the use reliability of the spacer sleeve is ensured.

Further, another embodiment of the present invention provides a sealing device for a compressor, wherein a sealing surface is formed at an inner hole of the cover plate, and the sealing surface is in clearance fit with an outer wall surface of the spacer sleeve.

Further, another embodiment of the invention provides a sealing device of a compressor, and the cross section of the flow guide plate is U-shaped or V-shaped.

Adopt above-mentioned technical scheme, the shape of the cross section of guide plate sets up to U-shaped or V-arrangement, and the setting of this kind of structure can make the guide plate carry out the water conservancy diversion to outside gas and lubricating oil better.

Further, another embodiment of the present invention provides a sealing device of a turbocharger including a compressor.

By adopting the technical scheme, the turbocharger in the embodiment comprises a sealing device of the compressor, an oil baffle plate in the sealing device of the compressor is provided with a body and a guide plate, the guide plate is fixedly connected to the body and is of an inwards concave structure, and a notch of the inwards concave structure faces to one side far away from the body; the guide plate extends towards the direction far away from the cover plate to form a gas inlet, gas is guided to enter the first space through the guide plate and form a first gas bag, and the lubricating oil flowing through the surface of the body is limited by the pressure generated by the first gas bag to leak into the compressor. It has the advantage that oil leakage can be prevented. The service performance of the turbocharger can be further improved.

Drawings

FIG. 1 is a schematic perspective view of a prior art turbocharger with a compressor located to the left of the turbocharger;

FIG. 2 is a schematic cross-sectional view of a prior art intermediate rotor assembly of a turbocharger;

FIG. 3 is a schematic perspective view of an oil baffle of a turbocharger in the prior art;

FIG. 4 is a schematic diagram of a prior art turbocharger oil and gas flow configuration;

fig. 5 is a schematic cross-sectional structural view of a sealing device of a compressor according to embodiment 1 of the present invention;

fig. 6 is a schematic view of a connection structure of a sealing device and each part of the compressor provided in embodiment 1 of the present invention;

fig. 7 is a schematic structural diagram of an oil baffle in a sealing device of a compressor according to embodiment 1 of the present invention;

fig. 8 is a schematic structural view of a spacer sleeve assembly in a sealing device of a compressor according to embodiment 1 of the present invention;

fig. 9 is a schematic structural view of a flange in a sealing device of a compressor according to embodiment 1 of the present invention;

fig. 10 is a schematic structural diagram of a cover plate in a sealing device of a compressor provided in embodiment 1 of the present invention;

fig. 11 is a schematic structural view of a turbocharger according to embodiment 2 of the present invention.

Description of reference numerals:

reference numerals of the prior art:

1: a compressor volute; 11: a thrust bearing; 12: a radial bearing; 13: an intermediate; 131: an oil inlet; 14: an oil baffle plate; 141: an oil outlet; 142: a baffle; 2: a shell pressing bolt; 3: an intermediate rotor assembly; 4: a volute clamp; 5: an exhaust gas turbine case; 15: a pinch roller; 16: and a cover plate.

Reference numerals of the invention:

10: a compressor; 11: a thrust bearing;

20: an oil return pipe; 30: a lubricating oil sump;

100: a cover plate; 110: a sealing surface;

200: an oil baffle plate; 210: a body; 220: a baffle;

300: a spacer sleeve assembly; 310: a spacer sleeve; 311: a sleeve body; 3110: a head portion; 3111: a tail portion; 3112: a piston ring groove; 312: a flange; 3120: an annular groove; 3121: a helical groove;

410: a thrust backing plate; 420: a thrust spacer sleeve; 430: a turbine shaft set;

a: a first space; a1: a first gas bag;

b: a second space; b1: a second gas packet.

Detailed Description

The following description is given by way of example of the present invention and other advantages and features of the present invention will become apparent to those skilled in the art from the following detailed description. While the invention will be described in conjunction with the preferred embodiments, it is not intended that features of the invention be limited to these embodiments. On the contrary, the invention is described in connection with the embodiments for the purpose of covering alternatives or modifications that may be extended based on the claims of the present invention. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. The invention may be practiced without these particulars. Moreover, some of the specific details have been left out of the description in order to avoid obscuring or obscuring the focus of the present invention. It should be noted that the embodiments and features of the embodiments of the present invention may be combined with each other without conflict.

It should be noted that in this specification, like reference numerals and letters refer to like items in the following drawings, and thus, once an item is defined in one drawing, it need not be further defined and explained in subsequent drawings.

The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

Example 1：

One embodiment of the present embodiment provides a sealing device for a compressor, as shown in fig. 5 to 7, for restricting the entry of lubricant into the compressor 10, the sealing device including a cover plate 100, an oil deflector 200, and a spacer sleeve assembly 300.

Specifically, in the present embodiment, the cover plate 100, the oil deflector 200, and the spacer sleeve assembly 300 are all mounted on the compressor 10, and the cover plate 100, the oil deflector 200, and the spacer sleeve assembly 300 are connected to each other to form the first space a.

More specifically, in the present embodiment, the oil baffle 200 has a main body 210 and a flow guiding plate 220, the flow guiding plate 220 is fixedly connected to the main body 210, and the flow guiding plate 220 is a concave structure, and a notch of the concave structure faces to a side far away from the main body 210; and the guide plate 220 extends away from the cover plate 100 to form a gas inlet, the gas is guided into the first space a by the guide plate 220 and forms a first gas bag a1, and the pressure generated by the first gas bag a1 limits the lubricating oil flowing through the surface of the body 210 from leaking into the compressor 10.

More specifically, in this embodiment, as shown in fig. 7, the guide plate 220 is configured to be a concave structure, the center of the guide plate is raised, and both sides of the guide plate are pulled down, for this reason, under the condition that the position of the connection point between the guide plate 220 and the body 210 of the oil baffle 200 is not changed, because the lower surface of the guide plate 220 is configured to be a concave structure, the arrangement of such a structure can increase the gas exchange area between the side portion of the oil baffle 200 and the engine crankcase, that is, the gas exchange area between the first space a and the outside can be increased, and at the same time, the first gas bag a1 can be formed in the first space a, the lubricating oil in the oil cavity of the intermediate body 13 is blocked from flowing into the compressor by the pressure generated by the first gas bag a1, and the turbocharger adopts the sealing device with such a structure, and the operating stability of the turbocharger can be further improved.

Meanwhile, the upper surface of the guide plate 220 can be formed into a structure with the middle bulging and the two sides pulled down, and under the condition, the lubricating oil flowing through the guide plate 220 can also be discharged along the two sides of the guide plate 220 under the action of the gravity of the lubricating oil, so that the outflow speed of the lubricating oil is increased, and the probability of the lubricating oil accumulating in the first space A is further reduced. Therefore, based on the above structure of the guide plate 220, it is possible to increase not only the air intake speed of the first space a, but also the outflow speed of the lubricating oil from the intermediate oil chamber, and thus it is possible to reduce the leakage of the lubricating oil flowing through the first space a into the compressor.

More specifically, in the present embodiment, the structure of the cover plate 100 is similar to that of a cover plate in a turbocharger in the related art, and the description of the present embodiment is omitted.

More specifically, in the present embodiment, the first gas bag a1 is a gas mass stored in the first space a, and since the gas inlet hole is connected to one side of the first space a, when the gas enters the first space a, the gas mass will be formed, that is, the first gas bag a1 will be formed, and since the gas generates pressure, the pressure generated by the first gas bag a1 can limit the lubricating oil flowing through the surface of the body 210 from leaking into the compressor 10 through the spacer sleeve assembly 300, and the reliability of the sealing device can be further improved.

More specifically, in the present embodiment, the gas refers to gas outside the compressor 10, and the lubricating oil refers to various lubricating oils such as engine oil.

More specifically, in the present embodiment, the oil baffle 200 has a main body 210 and a flow guiding plate 220, the flow guiding plate 220 is fixedly connected to the main body 210, and the flow guiding plate 220 is a concave structure, and a notch of the concave structure faces to a side far away from the main body 210; and the guide plate 220 extends towards the direction far away from the cover plate 100 to form a gas inlet, gas is guided to enter the first space A through the guide plate 220 and form a first gas bag A1, and the pressure generated by the first gas bag A1 limits the lubricating oil flowing through the surface of the body 210 from leaking into the compressor 10, so that the oil sealing capacity of the pressure end of the supercharger is improved, and the oil sealing capacity of the pressure end of the supercharger has the advantage of preventing oil leakage.

More specifically, according to the results of the related experiments, it is speculated that the oil sealing capacity of the embodiment is at least improved by more than-2.0 kPa (namely, the inlet of the compressor 10 can bear larger vacuum). The oil leakage test was performed on the current supercharger and the model machine of the new pressure booster of the present invention (only the structure of the oil baffle 200 was changed based on the existing supercharger), and the results of the internal pressure test at the start of oil leakage are shown in table 1. The result shows that the newly added pressure device has larger oil sealing capacity, and the oil sealing capacity is improved by more than-2.0 kPa under the same working condition. Here, P1-P3 correspond to the seal differential pressure (as shown in fig. 5), where P1 represents the pressure value outside the first space a and at the pressure of the back face of the compressor's pressure wheel, and P3 represents the pressure value inside the first space a.

TABLE 1

Design of	P1-P3[kPa]
		Existing superchargers	-1.0
New pressure increasing device	-3.3

Further, another embodiment of the present embodiment provides a sealing device for a compressor, as shown in fig. 5-8, a spacer sleeve assembly 300 includes a spacer sleeve 310 and a piston ring (not shown).

Specifically, in the present embodiment, the spacer sleeve 310 is sleeved on the turbine shaft of the compressor 10 and is respectively sleeved inside the cover plate 100 and the body 210 of the oil baffle 200, and the outer wall surface of the spacer sleeve 310 is respectively connected to the cover plate 100 and the body 210 of the oil baffle 200.

More specifically, in the present embodiment, the spacer 310 includes a sleeve body 311 and a flange 312, the sleeve body 311 has a head portion 3110 and a tail portion 3111, at least one piston ring groove 3112 is provided on an outer peripheral wall of the sleeve body 311 at a position close to the head portion 3110, a piston ring is mounted on the piston ring groove 3112, the flange 312 extends outward in a radial direction of the sleeve body 311 from an outer wall surface of the sleeve body 311 and surrounds the sleeve body 311 in a circumferential direction of the sleeve body 311, and the flange 312 is located between the piston ring groove 3112 and the tail portion 3111 in an axial direction of the sleeve body 311.

More specifically, in the present embodiment, since the spacer 310 includes the sleeve body 311 and the flange 312, the sleeve body 311 has the head portion 3110 and the tail portion 3111, at least one piston ring groove 3112 is provided on the outer peripheral wall of the sleeve body 311 at a position close to the head portion 3110, the piston ring is mounted on the piston ring groove 3112, the flange 312 extends outward in the radial direction of the sleeve body 311 from the outer wall surface of the sleeve body 311 and surrounds the sleeve body 311 in the circumferential direction of the sleeve body 311, and the flange 312 is located between the piston ring groove 3112 and the tail portion 3111 in the axial direction of the sleeve body 311. The piston ring is arranged to enable the spacer 310 to be more tightly connected with the inner hole of the cover plate 100, so that the sealing device in the embodiment has better reliability.

More specifically, in this embodiment, there may be 1 or 2 piston ring grooves 3112, or a larger number of the piston ring grooves 3112, which may be set according to actual design and use requirements, and this embodiment is not limited thereto.

Further, another embodiment of the present embodiment provides a sealing device for a compressor, as shown in fig. 7-8, a circumferential edge of one end of the flange 312 near the head 3110 is provided with an annular groove 3120, and a plurality of spiral grooves 3121 are provided on the flange 312 at intervals along the circumferential direction of the annular groove 3120; also, each spiral groove 3121 is located inside the annular groove 3120 in the radial direction of the flange 312, and one end of each spiral groove 3121 communicates with the annular groove 3120.

Specifically, in the present embodiment, the flange 312 is provided with an annular groove 3120 at the periphery of one end close to the head portion 3110, and the flange 312 is provided with a plurality of spiral grooves 3121 at intervals in the circumferential direction of the annular groove 3120. Moreover, each spiral groove 3121 is located inside the annular groove 3120 in the radial direction of the flange 312, one end of each spiral groove 3121 is communicated with the annular groove 3120, the annular groove 3120 and the spiral groove 3121 can be used for storing a certain amount of gas, and the pressure generated by the gas can limit the lubricant from entering the compressor 10.

Further, another embodiment of the present invention provides a sealing device for a compressor, wherein an opening is provided on a piston ring, and the opening is disposed opposite to an inner hole of the cover plate 100, so that a gap exists between the piston ring and the cover plate 100.

Specifically, in the present embodiment, the piston ring is provided with an opening, and the opening is disposed opposite to the inner hole of the cover plate 100, so that a gap exists between the piston ring and the cover plate 100, and the gap is disposed to allow the gas outside the compressor 10 to smoothly enter the spiral groove 3121 and the annular groove 3120.

Further, another embodiment of the present embodiment provides a sealing device of a compressor, an end surface of the flange 312 having the annular groove 3120 is attached to a side surface of the cover plate 100, a second space B is formed between the annular groove 3120 and the cover plate 100, gas from the other side of the cover plate 100 enters the second space B through a gap to form a second gas packet B1, and the flange 312 rotates along with the turbine shaft so that pressure generated by the second gas packet B1 limits leakage of the lubricating oil to the sealing ring.

Specifically, in the present embodiment, the second space B is formed between the annular groove 3120 and the cover plate 100, the gas from the other side of the cover plate 100 enters the second space B through the gap to form the second gas bag B1, and the pressure generated by the second gas bag B1 due to the rotation of the flange 312 along with the turbine shaft limits the leakage of the lubricating oil to the seal ring. The gas in the spiral groove 3121 rotates along with the turbine shaft, converts the absorbed rotational mechanical energy into pressure energy to increase the pressure of the gas itself, and flows into the annular groove 3120, thereby forming a stable second gas bag B1 having a higher pressure.

More specifically, the second gas bag B1 is a gas mass stored in the second space B, and since one side of the second space B communicates with the gap, when gas enters the second space B through the gap, the gas mass, that is, the second gas bag B1, is formed, and since the gas generates pressure, the pressure generated by the second gas bag B1 can limit the lubricant oil flowing through the surface of the body 210 from leaking into the compressor 10, and thus the reliability of the sealing device can be improved.

Further, another embodiment of the present embodiment provides a sealing device of a compressor, as shown in fig. 5, the sealing device further includes a thrust pad 410, and the thrust pad 410 is fixedly connected to the turbine shaft and abuts against the tail portion 3111 of the spacer 310.

Specifically, in the present embodiment, the thrust pad 410 may further position the spacer 310, thereby ensuring the reliability of the spacer 310.

More specifically, in the present embodiment, an impeller is disposed on the left side of the spacer sleeve 310, a thrust shim plate 410 is disposed on the right side, a thrust spacer sleeve 420 and a thrust shim plate 410 are sequentially disposed further away from the impeller direction, an inner ring of the thrust bearing 11 is fixed between the two thrust shim plates 410 along the axial direction of the turbine shaft, an outer circumferential portion of the oil baffle 200 is axially fixed between the cover plate 100 and the thrust bearing 11, an inner hole of the oil baffle 200 is sleeved on the outer circumference of the tail portion 3111 of the spacer sleeve 310, and a gap is formed between the inner hole and the outer circumference of the tail portion 3111 of the spacer sleeve 310, and the spacer sleeve 310, the thrust shim plate 410, the thrust spacer sleeve 420, the thrust bearing 11 and the other thrust shim plate 410 are all sleeved on the turbine shaft group 430.

Through the structure, the spacer sleeve assembly 300 and the oil baffle plate 200 can be further positioned, and the use performance of the sealing device of the compressor in the embodiment is better.

More specifically, in the present embodiment, the structure of the thrust pad 410 is similar to that of the thrust pad 410 in the prior art, and the detailed description of the present embodiment is omitted.

Further, another embodiment of the present embodiment provides a sealing device of a compressor, as shown in fig. 10, a sealing surface 110 is formed at an inner hole of a cover plate 100, and the sealing surface 110 is in clearance fit with an outer wall surface of a spacer sleeve 310.

Further, another embodiment of the present embodiment provides a sealing device of a compressor, and the cross section of the flow guide plate 220 has a U-shape or a V-shape.

Specifically, in the present embodiment, the cross section of the flow guide plate 220 is configured to be U-shaped or V-shaped, and this configuration enables the flow guide plate 220 to better guide the external air and the lubricating oil.

More specifically, in the present embodiment, the shape of the cross section of the baffle 220 may also be set to be an indent structure, which is common to those skilled in the art, and the indent structure may be specifically set according to the actual design and the use requirement, which is not limited in the present embodiment.

The embodiment provides a sealing device of a compressor, which is used for limiting lubricating oil from entering the compressor 10 and comprises a cover plate 100, an oil baffle plate 200 and a spacer sleeve assembly 300. The cover plate 100, the oil deflector 200, and the spacer sleeve assembly 300 are all mounted on the compressor 10, and the cover plate 100, the oil deflector 200, and the spacer sleeve assembly 300 are connected to each other to form a first space a. The oil baffle 200 comprises a body 210 and a flow guide plate 220, the flow guide plate 220 is fixedly connected to the body 210, the flow guide plate 220 is of a concave structure, and a notch of the concave structure faces to one side far away from the body 210; and the guide plate 220 extends away from the cover plate 100 to form a gas inlet, the gas is guided into the first space a by the guide plate 220 and forms a first gas bag a1, and the pressure generated by the first gas bag a1 limits the lubricating oil flowing through the surface of the body 210 from leaking into the compressor 10. The first gas bag A1 is a gas mass stored in the first space A, because one side of the first space A is connected with a gas inlet hole, when gas enters the first space A, the gas mass is formed, namely, the first gas bag A1 is formed, and because the gas generates pressure, the pressure generated by the first gas bag A1 can limit the lubricating oil flowing through the surface of the body 210 from leaking into the gas compressor 10, and the use reliability of the sealing device can be improved.

Further, the sealing device of the compressor can be used for turbochargers with different structures, and the sealing device can be set according to actual design and use requirements, which are not limited in the embodiment.

Example 2：

The present embodiment provides a turbocharger including the sealing device of the compressor in embodiment 1.

Specifically, as shown in fig. 5 to 10 in embodiment 1, the turbocharger in this embodiment includes a sealing device of a compressor, and an oil baffle 200 in the sealing device of the compressor has a body 210 and a flow guide plate 220, the flow guide plate 220 is fixedly connected to the body 210, and the flow guide plate 220 is a concave structure, a recess of the concave structure faces to a side away from the body 210; and the flow guide plate 220 extends in a direction away from the cover plate 100 to form a gas inlet, gas is guided into the first space a through the flow guide plate 220 to form a first gas bag a1, and the pressure generated by the first gas bag a1 limits the lubricating oil flowing through the surface of the body 210 from leaking into the compressor 10. The service performance of the turbocharger can be further improved.

More specifically, as shown in fig. 5, 7 and 11, with the sealing device of the compressor in embodiment 1, the gas in the crankcase of the engine may exhibit certain pressure fluctuations due to the periodic change of the gas volume in the crankcase of the engine caused by the reciprocating motion of the piston during the actual operation of the engine. The gas in the crankcase continuously enters the first space a formed between the cover plate 100 and the oil baffle plate 200 through the oil return pipe 20 (the inner diameter of which is larger than that of the oil inlet pipe), and forms a first gas bag a1, and the pressure generated by the first gas bag a1 can block the lubricating oil from entering the compressor 10. Moreover, the guide plate 220 in this embodiment is configured to be concave in a curved surface, the configuration of this structure can increase the gas exchange area between the side of the oil baffle 200 and the engine crankcase, that is, the gas exchange area between the first space a and the outside can be increased, and at the same time, the first gas bag a1 can be formed in the first space a, and the pressure generated by the first gas bag a1 can block the lubricating oil in the oil cavity of the intermediate body 13 from flowing into the compressor.

More specifically, the cross section of the baffle 220 in the axial direction of the turbine shaft may be one of an inverted U shape, an inverted V shape, a trapezoidal shape, or a polygonal shape. With the structure, the guide plate 220 can guide the lubricating oil to be drained into the oil return pipe as soon as possible under the action of gravity, so that the risk of lubricating oil leakage caused by excessive stay of the lubricating oil in the oil cavity of the intermediate body can be avoided.

More specifically, in the present embodiment, as shown in fig. 11, since the guide plate 220 is a concave structure, the lubricant in the compressor 10 can be accurately guided to the lubricant pool 30 through the oil return pipe 20.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A sealing device of an air compressor is used for limiting lubricating oil from entering the air compressor, and is characterized by comprising a cover plate, an oil baffle plate and a spacer sleeve assembly; wherein the content of the first and second substances,

2. The compressor seal of claim 1, wherein the spacer sleeve assembly comprises a spacer sleeve and a piston ring, wherein,

3. The sealing device of the compressor according to claim 2, wherein the flange is provided with an annular groove at the periphery of one end close to the head part, and a plurality of spiral grooves are formed on the flange at intervals along the circumferential direction of the annular groove; and each of the spiral grooves is located inside the annular groove in a radial direction of the flange, and one end of each of the spiral grooves communicates with the annular groove.

4. A sealing device for an air compressor according to claim 3, wherein an opening is provided in said piston ring, said opening being disposed opposite to an inner bore of said cover plate so that a gap exists between said piston ring and said cover plate.

5. The sealing device for the compressor according to claim 4, wherein an end surface of the flange having the annular groove is fitted to a side surface of the cover plate, a second space is formed between the annular groove and the cover plate, and gas from the other side of the cover plate enters the second space through the gap to form a second gas packet, and the flange rotates along with the turbine shaft so that pressure generated by the second gas packet restricts leakage of the lubricating oil to the sealing ring.

6. A seal arrangement for an air compressor as set forth in claim 3, further including a thrust pad fixedly attached to said turbine shaft and abutting said tail portion of said spacer sleeve.

7. A sealing arrangement for an air compressor as claimed in claim 3, wherein the cover plate has a sealing surface formed at its inner bore, the sealing surface being in clearance fit with the outer wall surface of the spacer sleeve.

8. Sealing arrangement for a compressor according to any one of claims 1-7, characterized in that the cross-section of the deflector is U-shaped or V-shaped.

9. A turbocharger comprising a sealing arrangement for a compressor as claimed in any one of claims 1 to 8.