Supercharger compressor end sealing structure and supercharger

Abstract

The utility model discloses a compressor end sealing structure of a supercharger and the supercharger. The compressor end sealing structure of the supercharger 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 utility model relates to the technical field of superchargers, in particular to a supercharger compressor end sealing structure and a supercharger. Background Art

[0002] The function of a turbocharger is to supply more compressed air to the engine, enabling the engine to burn more fuel, thereby generating more power, improving the fuel economy of the engine, and reducing the harmful components in the exhaust gas emitted by the engine. It is precisely because the supercharger has the effect of energy conservation and environmental protection that the supercharging technology has been comprehensively promoted in the engine field.

[0003] At present, in the field of supercharger compressors, the traditional sealing solution usually adopts a single or multiple piston rings arranged in a single way to achieve. However, this traditional sealing method has some problems: First, the traditional arrangement method of a single or multiple piston rings cannot meet the sealing requirements, and the sealing ability is not strong enough. Second, the existing sealing structure has limited protection effect against the invasion of lubricating oil, and cannot effectively prevent the immersion of lubricating oil, which is prone to cause the immersion of lubricating oil, thereby affecting the sealing performance, resulting in a decline in the performance of the sealing structure and a weak sealing ability.

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

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

[0006] To this end, the utility model provides a supercharger compressor end sealing structure, which is characterized in that it includes a hollow bearing body;

[0007] At the central position of the inner cavity of the bearing body, there is a turbine rotating shaft distributed horizontally;

[0008] On the outer circumferential wall of the turbine rotating shaft, a compressor impeller, a shaft seal sleeve, a thrust piece, and a thrust spacer sleeve are respectively installed from left to right in a circumferentially distributed manner;

[0009] On the outer circumferential wall of the shaft seal sleeve, an oil sealing cover and an oil baffle are installed in a circumferential manner;

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

[0011] On the outer circumferential wall of the thrust spacer sleeve, a thrust bearing plate is installed;

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

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

[0014] Among them, at least one rubber seal groove is circumferentially arranged on the outer wall of the oil seal cover.

[0015] An annular sealing rubber ring is arranged in the rubber seal groove, and the sealing rubber ring is elastically tension-connected with the rubber seal groove.

[0016] Among them, at least one seal ring mounting groove is circumferentially arranged on the outer wall of the shaft seal sleeve at a position corresponding to the inner hole wall of the oil seal cover.

[0017] A compression end seal ring is arranged in each seal ring mounting groove.

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

[0019] As can be seen from the technical solutions provided by the present utility model above, compared with the prior art, the present utility model provides a supercharger compressor end sealing structure and a supercharger, the structural design of which is scientific, can effectively improve the sealing ability of the supercharger compressor end, significantly reduce the invasion of lubricating oil on the compressor end sealing structure (specifically the compression end seal ring therein), improve the anti-lubricating oil immersion ability of the sealing structure, and has great practical significance.

[0020] For the present utility model, in order to improve the sealing ability of the supercharger compressor end, threaded connection is used in cooperation with a sealing rubber ring, and by increasing the oil baffle, the oil return labyrinth path, and expanding the volume, etc., and increasing the volume of the oil-gas mixing cavity, the anti-lubricating oil immersion ability of the sealing structure can be improved, thereby improving the sealing performance.

[0021] In addition, for the present utility model, technical means such as diversion and flow limiting are also adopted to reduce the invasion of lubricating oil on the compression end sealing structure, thereby greatly improving the sealing performance and the overall effect of the supercharger compressor. Brief Description of the Drawings

[0022] Figure 1 It is a structural schematic diagram of a supercharger compressor end sealing structure provided by the present utility model;

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

[0024] 6. thrust washer; 7. main oil passage; 8. oil seal cover; 9. shaft seal sleeve; 10. compression end seal ring;

[0025] 11. compressor impeller; 12. compressor impeller back air cavity; 13. turbine rotating shaft; 14. oil inlet passage;

[0026] 71. Oil baffle oil cavity; 72. Oil-gas mixing cavity; 73. Oil return cavity. Detailed implementation mode

[0027] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative work belong to the protection scope of the present invention.

[0028] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention.

[0029] In the description of this patent, it should be noted that unless otherwise clearly defined and limited, the terms "installation", "connection", "connection", "setting" should be understood in a broad sense. For example, it can be fixedly connected and set, or detachably connected and set, or integrally connected and set. For those of ordinary skill in the art, the specific meanings of the above terms in this patent can be understood according to specific situations.

[0030] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, "a plurality" means two or more unless otherwise specifically defined.

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

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

[0033] On the circumferential outer wall of the turbine rotating shaft 13, a compressor impeller 11, a shaft seal sleeve 9, a thrust washer 6 and a thrust spacer sleeve 4 are respectively installed from left to right in a circumferential distribution;

[0034] The circumferential outer wall of the shaft seal sleeve 9 is surrounded by an oil sealing cover 8 and an oil baffle 3 mounted thereon.

[0035] The oil sealing cover 8 and the oil baffle 3 are respectively located at the left and right ends of the shaft seal sleeve 9.

[0036] A thrust bearing plate 5 is mounted on the circumferential outer wall of the thrust spacer sleeve 4.

[0037] The thrust bearing plate 5 is mounted on the right thrust mounting surface of the inner cavity of the bearing housing 1.

[0038] Among them, the circumferential outer wall of the oil sealing cover 8 is threadedly connected to the inner side wall of the bearing housing 1.

[0039] Among them, at least one rubber ring sealing groove 801 is provided around the circumferential outer wall of the oil sealing cover 8.

[0040] An annular sealing rubber ring 2 is provided in each rubber ring sealing groove 801, and the sealing rubber ring 2 and the rubber ring sealing groove 801 are elastically tension-connected.

[0041] In the present utility model, specifically in implementation, the sealing rubber ring 2 (specifically the outer ring) is threadedly connected to the inner side wall of the bearing housing 1 to form a spiral seal connection.

[0042] In the present utility model, specifically in implementation, regarding the elastic tension connection between the sealing rubber ring 2 and the rubber ring sealing groove 801, the specific structural design is as follows:

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

[0044] Specifically in implementation, the radial cross-sectional shape of the sealing rubber ring 2 is circular or rectangular.

[0045] It should be noted that for the present utility model, by fixing the sealing rubber ring 2 in the rubber ring sealing groove 801 of the oil sealing cover 8 and elastically tensioning and snapping it in, the connection between the sealing rubber ring 2 and the bearing housing 1 is ensured to be tight and sealed.

[0046] In the present utility model, specifically in implementation, the circumferential outer walls of the oil sealing cover 8 and the thrust bearing plate 5 are in close contact with the right side wall of the inner cavity of the bearing housing 1.

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

[0048] In the present utility model, specifically in implementation, a concave groove is provided around the right side of the oil sealing cover 8.

[0049] A hollow oil and gas mixing cavity 72 is formed between the right side of the oil sealing cover 8 and the left side of the oil baffle 3.

[0050] At the lower end of the inner cavity of the bearing body 1, a hollow oil return cavity 73 is provided;

[0051] Specifically, the lower end of the oil-gas mixing cavity 72 is communicated with the left end of the oil return cavity 73;

[0052] In the present utility model, specifically, at the upper right part of the bearing body 1, a hollow oil inlet passage 14 is provided;

[0053] At the top of the oil inlet passage 14, an oil injection port for injecting lubricating oil is provided;

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

[0055] In the present utility model, specifically, the outer circumferential wall of the oil seal cover 8 is threadedly connected to the inner side wall of the bearing body 1, and the specific structural design is as follows:

[0056] The outer circumferential wall of the oil seal cover 8 is provided with an external thread in a surrounding manner;

[0057] On the inner cavity side wall of the bearing body 1, at a position corresponding to the external thread on the outer circumferential wall of the oil seal cover 8, an internal thread is provided in a surrounding manner;

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

[0059] It should be noted that for the present utility model, it is possible to increase the volume of the oil-gas mixing cavity 72 without changing the volume of the bearing body. Specifically, the external thread of the oil seal cover 8 and the internal thread of the bearing body 1 are tightly connected by threaded connection, thereby reducing the installation space and structurally expanding the volume of the oil-gas mixing cavity 72.

[0060] It should be noted that for the present utility model, by increasing the volume of the oil-gas mixing cavity 72, the oil content of the lubricating oil in the cavity is reduced, so that the leaked lubricating oil can gather as soon as possible, and enters the oil return cavity 73 through the diversion channel between the oil-gas mixing cavity 72 and the oil return cavity 73; in addition, by further expanding the volume of the oil return cavity 73, the height of the lubricating oil level in the oil return cavity 73 can be reduced, and the invasion of the lubricating oil on the pressure end sealing structure can be reduced.

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

[0062] In the present utility model, specifically, the left side of the shaft seal sleeve 9 is in contact with the right side of the compressor impeller 11;

[0063] The right side of the shaft seal sleeve 9 is in contact with the left side of the thrust washer 6;

[0064] On the right side of the thrust washer 6, it contacts the left side of the thrust spacer sleeve 4;

[0065] In the present utility model, specifically, 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 oil seal cover 8.

[0066] In the present utility model, specifically, at least one seal ring mounting groove is circumferentially provided on the outer wall of the shaft seal sleeve 9 at a position corresponding to the inner hole wall of the oil seal cover 8.

[0067] One compression end seal ring 10 is arranged in each seal ring mounting groove.

[0068] Specifically, the compression end seal ring 10 and the seal ring mounting groove are in interference fit.

[0069] Specifically, the radial cross-sectional shape of the compression end seal ring 10 is rectangular.

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

[0071] It should be noted that for the present utility model, shaft sealing and air sealing can be carried out. Specifically: arranging a single layer or multiple layers of compression end seal rings 10 on the shaft seal sleeve 9 can effectively prevent the lubricating oil from leaking out to the compressor impeller back air cavity 12 between the compressor impeller 11 and the oil seal cover 8. Conversely, it can reduce the air at the compressor end from entering the oil-gas mixing cavity 72 through the compression end seal ring 10.

[0072] It should be noted that for the present utility model, a diversion and flow limiting technology design is adopted, and the specific description is as follows:

[0073] First, the thrust spacer sleeve 4, the thrust bearing plate 5 and the thrust washer 6 form a first-stage flow limiting seal structure to control the lubricating oil flow rate entering the thrust bearing plate 5 from the main oil passage 7 and leaking out through the thrust washer 6.

[0074] Second, in the oil baffle oil cavity 71, through the flow limiting effect of the thrust washer 6 on the oil discharged from the thrust bearing plate 5 and the diversion effect of the oil baffle 3, a first-stage diversion seal structure is formed to reduce the lubricating oil flow rate entering the oil-gas mixing cavity 72.

[0075] Third, a diversion and flow-limiting device is provided in the oil-gas mixing chamber 72. By giving play to the diversion and flow-limiting functions of the oil sealing cover 8, the oil baffle 3, and the shaft gland 9, the flow direction and speed of the lubricating oil are controlled to form a second-stage diversion and flow-limiting sealing structure, so that the lubricating oil cannot penetrate into the pressure-end sealing structure.

[0076] Among them, through the flow-limiting function, the flow rate of the lubricating oil can be restricted, reducing the impact and immersion on the sealing structure. And through the diversion function, the flow path of the lubricating oil can be regulated, reducing 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 utility model described above, the present utility model also provides a supercharger, including the supercharger compressor-end sealing structure as described above.

[0078] Specifically, the supercharger includes: a compressor volute, a bearing housing 1, and a turbine housing;

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

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

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

[0082] 1. By using threaded connection and cooperating with a sealing rubber ring, the present utility model increases the oil-blocking and oil-returning labyrinth paths, which can increase the volume of the oil-gas mixing chamber, thereby improving the sealing ability of the supercharger compressor end. In this way, the invasion of the lubricating oil on the pressure-end sealing structure can be greatly reduced, and the anti-lubricating oil immersion ability is improved.

[0083] 2. The present utility model adopts technologies such as diversion and flow limitation, which can effectively control the flow direction and speed of the lubricating oil, reduce the influence of the lubricating oil on the compressor-end seal, improve the sealing effect of the shaft seal, reduce leakage, and lower the leakage rate.

[0084] 3. The utility model 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 of 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 shaft seal can be better protected and the service life can be extended. In addition, the expansion of the volume can reduce the pressure change in the oil-gas mixing chamber, reduce the loss of 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 utility model, it can be widely used in the fields of superchargers. In the field of superchargers, by applying the utility model, 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. The above is only a preferred embodiment of the utility model. It should be pointed out that for ordinary technicians in this technical field, without departing from the principle of the utility model, several improvements and modifications can be made, and these improvements and modifications should also be regarded as the protection scope of the utility model.

Claims

1. A supercharger compressor end sealing structure, characterized in that It includes a hollow bearing body (1); At the central position of the inner cavity of the bearing body (1), there is a turbine rotating shaft (13) distributed transversely; On the circumferential outer wall of the turbine rotating shaft (13), a compressor impeller (11), a shaft seal sleeve (9), a thrust washer (6) and a thrust spacer sleeve (4) are respectively installed from left to right in a circumferential distribution; On the circumferential outer wall of the shaft seal sleeve (9), an oil sealing cover (8) and an oil baffle (3) are installed circumferentially; The oil sealing cover (8) and the oil baffle (3) are respectively located at the left and right ends of the shaft seal sleeve (9); On the circumferential outer wall of the thrust spacer sleeve (4), a thrust bearing plate (5) is installed; The thrust bearing plate (5) is installed on the right thrust mounting surface of the inner cavity of the bearing body (1); Among them, the circumferential outer wall of the oil sealing cover (8) is threadedly connected to the inner side wall of the bearing body (1); Among them, on the circumferential outer wall of the oil sealing cover (8), at least one rubber ring sealing groove (801) is circumferentially provided; An annular sealing rubber ring (2) is arranged in the rubber ring sealing groove (801), and the sealing rubber ring (2) is elastically tensioned with the rubber ring sealing groove (801); Among them, on the circumferential outer wall of the shaft seal sleeve (9), at least one seal ring mounting groove is circumferentially provided at a position corresponding to the inner hole wall of the oil sealing cover (8); A compression end seal ring (10) is arranged in each seal ring mounting groove.

2. The supercharger compressor end sealing structure according to claim 1, wherein The sealing rubber ring (2) is threadedly connected to the inner side wall of the bearing body (1) to form a spiral seal connection.

3. The supercharger compressor end seal structure according to claim 2, characterized in that, The radial cross-sectional shape 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 oil cavity (71) is formed between the right side of the oil baffle (3) and the left side of the thrust bearing plate (5); On the right side of the oil sealing cover (8), a concave groove is circumferentially provided; A hollow oil-gas mixing cavity (72) is formed between the right side of the oil sealing cover (8) and the left side of the oil baffle (3); At the lower end of the inner cavity of the bearing body (1), a hollow oil return cavity (73) is provided; 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 oil sealing cover (8).

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

6. The supercharger compressor end sealing structure according to claim 1, wherein, On the upper right part of the bearing body (1), a hollow oil inlet channel (14) is provided; At the top of the oil inlet channel (14), an oil injection port for injecting lubricating oil is provided; The lower end of the oil inlet channel (14) is communicated with the installation space where the thrust bearing plate (5) is located through a transversely distributed main oil channel (7).

7. The supercharger compressor end seal structure according to claim 1, wherein Regarding the threaded connection between the circumferential outer wall of the oil sealing cover (8) and the inner side wall of the bearing body (1), the specific structural design is as follows: On the circumferential outer wall of the oil sealing cover (8), external threads are circumferentially provided; On the side wall of the inner cavity of the bearing body (1), internal threads are circumferentially provided at a position corresponding to the external threads on the circumferential outer wall of the oil sealing cover (8); The internal threads on the side wall of the inner cavity of the bearing body (1) are threadedly connected to the external threads on 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) is in contact with the right side of the compressor impeller (11); The right side of the shaft seal sleeve (9) is in contact with the left side of the thrust washer (6); On the right side of the thrust washer (6), it is in contact with the left side of the thrust spacer sleeve (4).

9. The supercharger compressor end sealing structure according to any one of claims 1 to 8, characterized in that, The press-side sealing ring (10) has an interference fit with the sealing ring installation groove; and / or The radial cross-sectional shape of the press-side sealing ring (10) is rectangular.

10. A supercharger, characterized in that, It includes a supercharger compressor end sealing structure according to any one of claims 1 to 9.

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