Supercharger compressor end sealing structure and supercharger

Abstract

The invention discloses a supercharger compressor end sealing structure and a supercharger. The supercharger compressor end sealing structure comprises a bearing body. A turbine rotating shaft is arranged in the center of an inner cavity of the bearing body; a gas compressor impeller, a shaft sealing sleeve, a thrust plate and a thrust spacer sleeve are respectively mounted on the circumferential outer wall of the turbine rotating shaft from left to right; an oil sealing cover and an oil baffle plate are mounted on the circumferential outer wall of the shaft sealing sleeve in a surrounding manner; a thrust bearing plate is mounted on the circumferential outer wall of the thrust spacer sleeve; the circumferential outer wall of the oil sealing cover is in threaded connection with the inner side wall of the bearing body; a rubber ring sealing groove is formed in the circumferential outer wall of the oil sealing cover in a surrounding mode. A sealing rubber ring is arranged in the rubber ring sealing groove, and the sealing rubber ring is in spiral sealing connection with threads on the inner side wall of the bearing body. The sealing structure is scientific in structural design, the sealing capacity of the gas compressor end of the supercharger can be effectively improved, invasion of lubricating oil to the sealing structure (particularly the pressure end sealing ring) of the gas compressor end is obviously reduced, and the lubricating oil soaking resistance of the sealing structure is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of superchargers, and in particular to a supercharger compressor end sealing structure and a supercharger. Background Art

[0002] The function of a turbocharger is to provide more compressed air to the engine, so that the engine can burn more fuel, thereby generating more power, improving the fuel economy of the engine, and reducing harmful components in the exhaust gas emitted by the engine. It is precisely because of the energy-saving and environmentally friendly effects of the turbocharger that the turbocharging technology has been fully promoted in the engine field.

[0003] At present, in the field of supercharger compressors, the traditional sealing solution is usually implemented by arranging a single or multiple piston rings. However, this traditional sealing method has some problems: First, the traditional arrangement of single or multiple piston rings cannot meet the sealing requirements, and the sealing ability is not strong enough. Secondly, the existing sealing structure has limited protection against the invasion of lubricating oil, and cannot effectively prevent the immersion of lubricating oil, which easily leads to the immersion of lubricating oil, thereby affecting the sealing performance, resulting in the performance of the sealing structure being reduced and the sealing ability being weak.

[0004] Therefore, there is an urgent need to develop a technology that can solve the above technical problems. Summary of the invention

[0005] The purpose of the present invention is to provide a supercharger compressor end sealing structure and a supercharger in view of the technical defects in the prior art.

[0006] To this end, the present invention provides a compressor end sealing structure of a supercharger, characterized in that it includes a hollow bearing body;

[0007] The center of the inner cavity of the bearing body is provided with a turbine shaft distributed laterally;

[0008] The circumferential outer wall of the turbine shaft is respectively provided with a compressor impeller, a shaft seal sleeve, a thrust plate and a thrust spacer sleeve which are arranged in a circumferential manner from left to right;

[0009] The circumferential outer wall of the shaft seal sleeve is circumferentially provided with an oil sealing cover and an oil baffle plate;

[0010] The oil sealing cover and oil baffle are located at the left and right ends of the shaft seal sleeve respectively;

[0011] The circumferential outer wall of the thrust spacer sleeve is provided with a thrust bearing plate;

[0012] A thrust bearing plate is mounted on the thrust mounting surface on the right side of the inner cavity of the bearing body;

[0013] Wherein, the circumferential outer wall of the oil sealing cover is threadedly connected with the inner wall of the bearing body;

[0014] Wherein, the circumferential outer wall of the oil sealing cover is circumferentially provided with at least one rubber ring sealing groove;

[0015] An annular sealing rubber ring is arranged in the rubber ring sealing groove, and the sealing rubber ring is elastically tensionedly connected to the rubber ring sealing groove;

[0016] Wherein, the circumferential outer wall of the shaft seal sleeve is circumferentially provided with at least one sealing ring installation groove at a position corresponding to the inner hole wall of the oil seal cover;

[0017] A pressure end sealing ring is arranged in each sealing ring installation groove.

[0018] In addition, the present invention also provides a supercharger, comprising the supercharger compressor end sealing structure as described above.

[0019] It can be seen from the technical solution provided by the present invention that, compared with the prior art, the present invention provides a supercharger compressor end sealing structure and a supercharger, which have a scientific structural design, can effectively improve the sealing ability of the compressor end of the supercharger, significantly reduce the invasion of lubricating oil on the compressor end sealing structure (specifically the compressor end sealing ring therein), and improve the sealing structure's ability to resist lubricating oil immersion, which has great practical significance.

[0020] For the present invention, in order to improve the sealing ability of the compressor end of the supercharger, a threaded connection is used in combination with a sealing rubber ring. By adding an oil baffle, an oil return labyrinth path, and expanding the volume, and increasing the volume of the oil-gas mixing chamber, the sealing structure's ability to resist lubricating oil immersion can be improved, thereby improving the sealing performance.

[0021] In addition, the present invention also reduces the invasion of lubricating oil on the compression end sealing structure through technical means such as flow diversion and flow limiting, thereby greatly improving the sealing performance and enhancing the overall effect of the supercharger compressor. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 A structural schematic diagram of a compressor end sealing structure of a supercharger provided by the present invention;

[0023] In the figure, 1, bearing body; 2, sealing rubber ring; 3, oil baffle plate; 4, thrust spacer sleeve; 5, thrust bearing plate;

[0024] 6. Thrust plate; 7. Main oil channel; 8. Oil seal cap; 9. Shaft seal sleeve; 10. Pressure end sealing ring;

[0025] 11. Compressor impeller; 12. Air cavity behind the compressor impeller; 13. Turbine shaft; 14. Oil inlet passage;

[0026] 71. Oil baffle oil chamber; 72. Oil-gas mixing chamber; 73. Oil return chamber. DETAILED DESCRIPTION

[0027] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0028] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0029] In the description of this patent, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", and "set" should be understood in a broad sense, for example, it can be fixedly connected or set, or it can be detachably connected or set, or connected or set in one piece. For ordinary technicians in this field, the specific meanings of the above terms in this patent can be understood according to specific circumstances.

[0030] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0031] See also Figure 1 , the present invention provides a supercharger compressor end sealing structure and a supercharger, comprising a hollow bearing body 1;

[0032] At the center of the inner cavity of the bearing body 1, there is a turbine shaft 13 distributed laterally;

[0033] The circumferential outer wall of the turbine shaft 13 is respectively provided with a compressor impeller 11, a shaft seal sleeve 9, a thrust plate 6 and a thrust spacer sleeve 4 which are arranged in a surrounding manner from left to right;

[0034] The circumferential outer wall of the shaft seal sleeve 9 is circumferentially mounted with an oil seal cover 8 and an oil baffle plate 3;

[0035] The oil sealing cover 8 and the oil baffle plate 3 are respectively located at the left and right ends of the shaft sealing sleeve 6;

[0036] The circumferential outer wall of the thrust spacer sleeve 4 is provided with a thrust bearing plate 5;

[0037] The thrust bearing plate 5 is mounted on the thrust mounting surface on the right side of the inner cavity of the bearing body 1;

[0038] The circumferential outer wall of the oil sealing cover 8 is threadedly connected to the inner wall of the bearing body 1;

[0039] The circumferential outer wall of the oil sealing cover 8 is circumferentially provided with at least one rubber ring sealing groove 801;

[0040] An annular sealing rubber ring 2 is arranged in each rubber ring sealing groove 801 , and the sealing rubber ring 2 is elastically tensionedly connected to the rubber ring sealing groove 801 .

[0041] In the present invention, in a specific implementation, the sealing rubber ring 2 (specifically the outer ring) and the inner wall thread of the bearing body 1 form a spiral sealing connection.

[0042] In the present invention, in specific implementation, the sealing rubber ring 2 and the rubber ring sealing groove 801 are elastically tensioned and connected, and the specific structural design is as follows:

[0043] The inner ring of the sealing rubber ring 2 is elastically tensionedly connected to the bottom of the rubber ring sealing groove 801 .

[0044] In a specific implementation, the radial cross-section of the sealing rubber ring 2 is circular or rectangular.

[0045] It should be noted that, in the present invention, the sealing rubber ring 2 is fixed in the rubber ring sealing groove 801 of the oil sealing cover 8 and is clamped in place by elastic tensioning, thereby ensuring that the connection between the sealing rubber ring 2 and the bearing body 1 is tight and sealed.

[0046] In the present invention, in a specific implementation, the circumferential outer wall of the oil sealing cover 8 and the circumferential outer wall of the thrust bearing plate 5 are in close contact with the right side wall of the inner cavity of the bearing body 1;

[0047] A hollow oil baffle plate oil chamber 71 is formed between the right side of the oil baffle plate 3 and the left side of the thrust bearing plate 5;

[0048] In the present invention, in a specific implementation, the right side of the oil sealing cover 8 is surrounded by an inwardly concave groove;

[0049] A hollow oil-gas mixing chamber 72 is formed between the right side of the oil sealing cover 8 and the left side of the oil baffle plate 3;

[0050] A hollow oil return chamber 73 is provided at the lower end of the inner cavity of the bearing body 1;

[0051] In specific implementation, the lower end of the oil-gas mixing chamber 72 is connected to the left end of the oil return chamber 73;

[0052] In the present invention, in a specific implementation, a hollow oil inlet channel 14 is provided on the upper right side of the bearing body 1;

[0053] The top of the oil inlet channel 14 is provided with an oil filling port for injecting lubricating oil;

[0054] The lower end of the oil inlet passage 14 is connected to the installation space where the thrust bearing plate 5 is located through a transversely distributed main oil passage 7;

[0055] In the present invention, in a specific implementation, the circumferential outer wall of the oil sealing cover 8 is threadedly connected to the inner wall of the bearing body 1, and the specific structural design is as follows:

[0056] The circumferential outer wall of the oil sealing cover 8 is circumferentially provided with external threads;

[0057] The inner cavity side wall of the bearing body 1 is circumferentially provided with an internal thread at a position corresponding to the external thread of the circumferential outer wall of the oil sealing cover 8;

[0058] The internal thread of the inner cavity side wall of the bearing body 1 is threadedly connected with the external thread of the circumferential outer wall of the oil sealing cover 8.

[0059] It should be noted that, according to the present invention, the volume of the oil-gas mixing chamber 72 can be increased without changing the volume of the bearing body. Specifically, the external thread of the oil sealing cover 8 is fastened to the internal thread of the bearing body 1 through a threaded connection, thereby reducing the installation space and structurally expanding the volume of the oil-gas mixing chamber 72.

[0060] It should be noted that, for the present invention, by increasing the volume of the oil-gas mixing chamber 72 and reducing the oil content of the lubricating oil in the chamber, the leaked lubricating oil can be gathered as quickly as possible and enter the oil return chamber 73 through the guide channel between the oil-gas mixing chamber 72 and the oil return chamber 73; in addition, the volume of the oil return chamber 73 can be further expanded to reduce the height of the lubricating oil level in the oil return chamber 73, thereby reducing the invasion of the lubricating oil on the pressure end sealing structure.

[0061] In the present invention, it should be noted that a plurality of turbine blades are mounted on the compressor impeller 11 .

[0062] In the present invention, in a specific implementation, the left side of the shaft seal sleeve 9 contacts the right side of the compressor impeller 11;

[0063] The right side of the shaft seal sleeve 9 contacts the left side of the thrust plate 6;

[0064] The right side of the thrust plate 6 contacts the left side of the thrust spacer sleeve 4;

[0065] In the present invention, in a specific implementation, a hollow compressor impeller back air cavity 12 is formed between the right side of the compressor impeller 11 and the left side of the shaft seal cover 8 .

[0066] In the present invention, in a specific implementation, the circumferential outer wall of the shaft seal sleeve 6 is circumferentially provided with at least one sealing ring installation groove at a position corresponding to the inner hole wall of the oil seal cover 8;

[0067] A pressure end sealing ring 10 is arranged in each sealing ring installation groove;

[0068] In a specific implementation, the pressure end sealing ring 10 and the sealing ring installation groove are interference fit.

[0069] In a specific implementation, the radial cross-section of the pressure end sealing ring 10 is a rectangle.

[0070] It should be noted that, for the present invention, an oil baffle and oil return labyrinth path (i.e., a lubricating oil flow path with multiple bends) is added: around the thrust bearing plate 5, thrust plate 6, oil baffle plate 3, shaft seal sleeve 9 and oil sealing cover 8, an oil baffle plate and an oil return labyrinth path are designed, so that the lubricating oil cannot directly contact the compression end sealing ring 10 structure, thereby reducing the invasion of the lubricating oil on the sealing structure.

[0071] It should be noted that, for the present invention, shaft sealing and air sealing can be performed, specifically: a single-layer or multi-layer compression end sealing ring 10 is arranged on the shaft sealing sleeve 9, which can effectively prevent the lubricating oil from leaking into the compressor impeller back air cavity 12 between the compressor impeller 11 and the shaft sealing cover 8. Conversely, the compressor end air can be reduced from entering the oil-gas mixing cavity 72 through the compression end sealing ring 10.

[0072] It should be noted that, for the present invention, the flow diversion and flow limiting technology design is adopted, which is specifically described as follows:

[0073] First, the thrust spacer sleeve 4, the thrust bearing plate 5 and the thrust plate 6 form a first-level flow-limiting sealing structure to control the flow of lubricating oil entering the thrust bearing plate 5 from the main oil passage 7 and leaking out through the thrust plate 6;

[0074] Second, in the oil baffle plate oil chamber 71, the thrust plate 6 limits the flow of oil leaking from the thrust bearing plate 5 and the oil baffle plate 3 guides the flow, forming a first-level flow guide sealing structure to reduce the flow of lubricating oil entering the oil-gas mixing chamber 72;

[0075] Third, a flow guiding and flow limiting device is set in the oil-gas mixing chamber 72. By exerting the flow guiding and flow limiting functions of the oil sealing cover 8, the oil baffle plate 3 and the shaft sealing sleeve 8, the flow direction and speed of the lubricating oil are controlled to form a second-level flow guiding and flow limiting sealing structure, so that the lubricating oil cannot penetrate into the pressure end sealing structure.

[0076] The flow limiting function can limit the flow of lubricating oil and reduce the impact and soaking of the sealing structure, while the flow guiding function can regulate the flow path of lubricating oil and reduce the contact with the sealing structure (specifically the pressure end sealing ring 10).

[0077] Based on the supercharger compressor end sealing structure provided by the present invention, the present invention further provides a supercharger, comprising the supercharger compressor end sealing structure as described above.

[0078] In specific implementation, the supercharger includes: a compressor volute, a bearing body 1 and a turbine box;

[0079] The left and right ends of the bearing body 1 are sealed and connected to the hollow compressor volute and the hollow turbine box respectively.

[0080] It should be noted that the connection structure design and working principle between the bearing body 1 and the compressor volute and turbine housing are well-known technologies in the prior art and will not be described in detail here.

[0081] Compared with the prior art, the compressor end sealing structure and supercharger provided by the present invention have the following beneficial effects:

[0082] 1. The present invention increases the volume of the oil-gas mixing chamber by using threaded connection with a sealing rubber ring to increase the oil blocking and oil return labyrinth path, thereby improving the sealing ability of the compressor end of the supercharger, which can greatly reduce the invasion of lubricating oil on the compression end sealing structure and improve the ability to resist lubricating oil immersion.

[0083] 2. The present invention adopts flow guidance, flow limiting and other technologies to effectively control the flow direction and speed of the lubricating oil and reduce the influence of the lubricating oil on the compressor end seal, thereby improving the sealing effect of the shaft seal, reducing leakage and lowering the leakage rate.

[0084] 3. The present invention applies a threaded connection with a sealing rubber ring to the oil-gas mixing chamber, which can expand the volume of the oil-gas mixing chamber while keeping the volume of the bearing body unchanged, thereby increasing the capacity of the oil-gas mixing chamber and further improving the sealing ability of the compressor end of the supercharger. This can reduce the pressure change in the oil-gas mixing chamber and reduce the loss to the sealing structure. Since the volume of the oil-gas mixing chamber is increased, the ability to resist lubricating oil immersion is improved, and the invasion of lubricating oil on the sealing structure is reduced, the engine shaft seal can be better protected and the service life can be extended. In addition, expanding the volume can reduce the pressure change in the oil-gas mixing chamber, reduce the loss to the sealing structure, and improve the stability and reliability of the sealing ability.

[0085] In terms of specific implementation, due to the advanced nature of the present invention, it can be widely used in the fields of superchargers. In the field of superchargers, by applying the present invention, the performance and efficiency of the supercharger can be improved, making it more stable and reliable. Superchargers are widely used in the fields of internal combustion engines, generators, ships, etc., which can improve power output and combustion efficiency, reduce energy consumption and environmental pollution. By improving the sealing ability of the compressor end of the supercharger, the normal operation of the supercharger can be guaranteed, and its service life and reliability can be improved.

[0086] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A supercharger compressor end sealing structure, characterized in that: It comprises a hollow bearing body (1); A turbine shaft (13) is disposed laterally at the center of the inner cavity of the bearing body (1); The circumferential outer wall of the turbine shaft (13) is respectively provided with a compressor impeller (11), a shaft seal sleeve (9), a thrust plate (6) and a thrust spacer sleeve (4) which are arranged in a circumferential manner from left to right; An oil sealing cover (8) and an oil baffle plate (3) are mounted around the circumferential outer wall of the shaft sealing sleeve (9); The oil sealing cover (8) and the oil baffle plate (3) are respectively located at the left and right ends of the shaft sealing sleeve (6); A thrust bearing plate (5) is mounted on the circumferential outer wall of the thrust spacer sleeve (4); A thrust bearing plate (5) is mounted on a thrust mounting surface on the right side of the inner cavity of the bearing body (1); The circumferential outer wall of the oil sealing cover (8) is threadedly connected to the inner wall of the bearing body (1); Wherein, the circumferential outer wall of the oil sealing cover (8) is circumferentially provided with at least one rubber ring sealing groove (801); An annular sealing rubber ring (2) is arranged in the rubber ring sealing groove (801), and the sealing rubber ring (2) is elastically tensionedly connected to the rubber ring sealing groove (801); Wherein, the circumferential outer wall of the shaft sealing sleeve (6) is circumferentially provided with at least one sealing ring installation groove at a position corresponding to the inner hole wall of the oil sealing cover (8); A pressing end sealing ring (10) is arranged in each sealing ring installation groove.

2. The supercharger compressor end sealing structure according to claim 1, characterized in that: The sealing rubber ring (2) and the inner wall thread of the bearing body (1) form a spiral sealing connection.

3. The supercharger compressor end sealing structure according to claim 2, characterized in that: The radial cross-section of the sealing rubber ring (2) is circular or rectangular.

4. The supercharger compressor end sealing structure according to claim 1, characterized in that: The circumferential outer wall of the oil sealing cover (8) and the circumferential outer wall of the thrust bearing plate (5) are in close contact with the thrust mounting surface of the bearing body (1); A hollow oil baffle plate oil chamber (71) is formed between the right side of the oil baffle plate (3) and the left side of the thrust bearing plate (5); The right side of the oil sealing cover (8) is surrounded by a concave groove; A hollow oil-gas mixing chamber (72) is formed between the right side of the oil sealing cover (8) and the left side of the oil baffle plate (3); A hollow oil return chamber (73) is provided at the lower end of the inner cavity of the bearing body (1); A hollow compressor impeller back air cavity (12) is formed between the right side of the compressor impeller (11) and the left side of the shaft seal cover (8).

5. The supercharger compressor end sealing structure according to claim 4, characterized in that: The lower end of the oil-gas mixing chamber (72) is communicated with the left end of the oil return chamber (73).

6. The compressor end sealing structure of a supercharger according to any one of claims 1 to 5, characterized in that: A hollow oil inlet passage (14) is provided on the upper right side of the bearing body (1); The top of the oil inlet channel (14) is provided with an oil filling port for injecting lubricating oil; The lower end of the oil inlet passage (14) is connected to the installation space where the thrust bearing plate (5) is located through a transversely distributed main oil passage (7).

7. The supercharger compressor end sealing structure according to claim 1, characterized in that: The circumferential outer wall of the oil sealing cover (8) is threadedly connected to the inner wall of the bearing body (1), and the specific structural design is as follows: The circumferential outer wall of the oil sealing cover (8) is circumferentially provided with external threads; The inner cavity side wall of the bearing body (1) is circumferentially provided with an internal thread at a position corresponding to the external thread of the circumferential outer wall of the oil sealing cover (8); The internal thread of the inner cavity side wall of the bearing body (1) is threadedly connected with the external thread of the circumferential outer wall of the oil sealing cover (8).

8. The supercharger compressor end sealing structure according to claim 1, characterized in that: The left side of the shaft seal sleeve (9) contacts the right side of the compressor impeller (11); The right side of the shaft sealing sleeve (9) contacts the left side of the thrust plate (6); The right side of the thrust plate (6) contacts the left side of the thrust spacer sleeve (4).

9. The compressor end sealing structure of a supercharger according to any one of claims 1 to 5, characterized in that: The pressure end sealing ring (10) and the sealing ring installation groove are interference fit; and / or, The radial cross-section of the pressure end sealing ring (10) is rectangular.

10. A supercharger, characterized in that: The invention comprises a supercharger compressor end sealing structure as claimed in any one of claims 1 to 9.

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