Crankshaft structure for improving reliability of compressor

Abstract

The crankshaft structure comprises a long shaft section and a short shaft section, a long shaft oil hole communicated with an oil pool is formed in the long shaft section, a spiral oil groove is formed in the outer surface of the long shaft section, one end of the spiral oil groove is communicated with an upper oil hole, and the other end of the spiral oil groove extends to a shaft shoulder oil hole and is communicated with the short shaft section. The spiral oil groove is divided into a first oil groove section and a second oil groove section in the axial direction, and an annular groove is formed between the first oil groove section and the second oil groove section. A plurality of blade-shaped grooves are formed in the annular groove in the circumferential direction at intervals, and the depth of the blade-shaped grooves is lower than the matching surface of the long shaft section and the shaft hole. The vane-shaped grooves increase the oil pumping quantity of the long shaft oil hole through local negative pressure when the crankshaft rotates; through the synergistic effect of the sectional type spiral oil grooves of the crankshaft oil groove structure and the blade-shaped grooves, local negative pressure is formed during rotation so as to remarkably improve the oil pumping efficiency, and then the purposes of reducing the abrasion and jamming risk of compressor parts and improving the lubricating effect are achieved.

Description

Technical Field

[0001] This utility model relates to the field of compressor crankshaft technology, specifically to a crankshaft structure that improves the reliability of a compressor. Background Technology

[0002] In traditional compressor crankshaft structures, the long shaft surface typically uses a single spiral oil groove as the lubricating oil delivery channel. Because the distance between the long shaft oil hole and the shoulder oil hole is fixed, the helix height and helix angle of the spiral oil groove are also fixed values, making it impossible to adjust the pumping oil volume according to actual operating conditions. For high-power or commercial compressors, a fixed pumping oil volume is difficult to match the lubrication and heat dissipation requirements during high-load operation, thus limiting the optimization of overall performance.

[0003] In existing technologies, the fixed design of a single spiral oil groove is prone to causing insufficient oil pumping efficiency. When the lubricating oil delivery is limited, the oil film covering the internal friction pairs of the compressor is insufficient, which may accelerate component wear or even lead to seizure. At the same time, insufficient lubrication can also cause the internal temperature of the compressor to rise, leading to a chain reaction of problems such as motor overheating and burnout, cylinder head carbon buildup, and oil deterioration. These problems are particularly prominent in high-power or long-term operation scenarios.

[0004] Another limitation of existing crankshaft oil groove structures lies in their poor versatility. Because the oil groove parameters cannot be adjusted to adapt to different power levels or application scenarios, traditional designs struggle to balance the conflict between lubrication efficiency and heat dissipation requirements. This deficiency not only affects the reliability and service life of the compressor but also restricts its application potential in diverse industrial settings. Therefore, there is an urgent need for an improved crankshaft oil groove structure that can flexibly improve pumping efficiency and optimize heat dissipation performance. Utility Model Content

[0005] In view of the above-mentioned technical problems in related technologies, this utility model proposes a crankshaft structure to improve the reliability of compressors, which can overcome the above-mentioned shortcomings of the prior art.

[0006] To achieve the above-mentioned technical objectives, the technical solution of this utility model is implemented as follows:

[0007] A crankshaft structure to improve compressor reliability;

[0008] The crankshaft structure for improving compressor reliability includes a long shaft section and a short shaft section. The long shaft section has an oil hole inside that connects to the oil sump, and a spiral oil groove on its outer surface. One end of the spiral oil groove connects to the upper oil hole, and the other end extends to the shoulder oil hole and connects to the short shaft section. The spiral oil groove is divided into a first oil groove and a second oil groove along the axial direction, and an annular groove is provided between the first oil groove and the second oil groove. Several blade-shaped grooves are arranged circumferentially in the annular groove. The depth of the blade-shaped grooves is 0.3-0.7 mm and is lower than the mating surface of the long shaft section and the shaft hole. When the crankshaft rotates, the blade-shaped grooves increase the pumping volume of the long shaft oil hole through local negative pressure.

[0009] Furthermore, the cross-sectional shape of the blade-shaped groove is one of square, trapezoidal or circular arc.

[0010] Furthermore, the depth of the blade-shaped groove is 0.5 mm.

[0011] Furthermore, the spiral angle of the first oil tank and the second oil tank is between 20 and 30 degrees.

[0012] Furthermore, the helix angles of the first and second oil tank sections may be the same or different.

[0013] Furthermore, the axial width of the annular groove is 1 / 5 to 1 / 10 of the total length of the long axis segment.

[0014] Furthermore, the first and second oil grooves are both right-handed, and the pitch of the two oil grooves is the same.

[0015] Furthermore, the number of blade-shaped grooves in the annular groove is 6-12, and the blade-shaped grooves form a continuous or discontinuous fluid guiding channel in the annular groove.

[0016] The beneficial effects of this utility model are as follows: Through the optimized and improved design of the product of this utility model, the segmented spiral oil groove and the blade-shaped groove of the crankshaft oil groove structure work together to form a local negative pressure during rotation, which significantly improves the oil pumping efficiency, thereby reducing the wear and seizing risk of compressor components and improving the lubrication effect. At the same time, by enhancing the heat dissipation capacity, it effectively suppresses motor overheating, cylinder head carbon deposits and oil deterioration, thus improving the overall reliability and service life of the compressor. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a first-view overall structural schematic diagram of a crankshaft structure for improving compressor reliability according to an embodiment of the present utility model;

[0019] Figure 2 This is a second-view overall structural schematic diagram of a crankshaft structure for improving compressor reliability according to an embodiment of the present utility model;

[0020] Figure 3 This is a crankshaft structure for improving compressor reliability according to an embodiment of the present invention. Figure 2 A magnified view of a section at point A in the middle;

[0021] Figure 4 This is a schematic diagram of the overall structure of a conventional compressor crankshaft according to an embodiment of the present invention;

[0022] In the diagram: 1. Long shaft section; 2. Shoulder shaft section; 3. Short shaft section; 4. Long shaft oil hole; 5. Shoulder shaft oil hole; 6. Vent hole; 7. Traditional single spiral oil groove; 8. First section oil groove; 9. Second section oil groove; 10. Annular groove; 11. Leaf-shaped groove. Detailed Implementation

[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art are within the protection scope of the present utility model.

[0024] It should be understood that in the description of the embodiments of this utility model, the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this utility model. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of the stated features. In the description of the embodiments of this utility model, "several" means two or more, unless otherwise explicitly specified.

[0025] like Figure 1-3 As shown, a crankshaft structure for improving compressor reliability according to this utility model includes a long shaft section 1 and a short shaft section 3. The long shaft section 1 has a long shaft oil hole 4 connected to an oil sump inside. The outer surface of the long shaft section 1 has a spiral oil groove. One end of the spiral oil groove is connected to the upper oil hole, and the other end extends to the shoulder oil hole 5 and is connected to the short shaft section 3. The spiral oil groove is divided into a first oil groove 8 and a second oil groove 9 along the axial direction. An annular groove 10 is provided between the first oil groove 8 and the second oil groove 9. A plurality of blade-shaped grooves 11 are arranged circumferentially in the annular groove 10. The depth of the blade-shaped grooves 11 is 0.3-0.7mm and is lower than the mating surface of the long shaft section 1 and the shaft hole. When the crankshaft rotates, the blade-shaped grooves 11 increase the pumping volume of the long shaft oil hole 4 through local negative pressure.

[0026] According to the crankshaft structure for improving compressor reliability described in this utility model, in a specific embodiment, the cross-sectional shape of the blade-shaped groove 11 is one of square, trapezoidal or arc shape.

[0027] According to the crankshaft structure for improving compressor reliability described in this utility model, in a specific embodiment, the depth of the blade-shaped groove 11 is 0.5 mm.

[0028] According to the crankshaft structure for improving compressor reliability described in this utility model, in a specific embodiment, the helical angle of the first oil groove 8 and the second oil groove 9 is 20 to 30 degrees.

[0029] According to the crankshaft structure for improving compressor reliability described in this utility model, in a specific embodiment, the helix angles of the first oil groove 8 and the second oil groove 9 are the same or different.

[0030] According to the crankshaft structure for improving compressor reliability described in this utility model, in a specific embodiment, the axial width of the annular groove 10 is 1 / 5 to 1 / 10 of the total length of the long shaft segment 1.

[0031] According to the crankshaft structure for improving compressor reliability described in this utility model, in a specific embodiment, the first oil groove 8 and the second oil groove 9 are both right-handed, and the pitch of the two oil grooves is the same.

[0032] According to the crankshaft structure for improving compressor reliability described in this utility model, in a specific embodiment, the number of blade-shaped grooves 11 in the annular groove 10 is 6-12, and the blade-shaped grooves 11 form a continuous or discontinuous fluid guiding channel in the annular groove 10.

[0033] To facilitate understanding of the above-mentioned technical solutions of this utility model, the following detailed description of the above-mentioned technical solutions of this utility model is provided through specific usage methods.

[0034] In practical use, according to the crankshaft structure for improving compressor reliability described in this utility model, with the distance between the long shaft oil hole 4 and the shoulder oil hole 5 fixed, the traditional single spiral oil groove 7 of the compressor crankshaft structure is divided into two spiral oil grooves: the first oil groove 8 and the second oil groove 9. An annular groove 10 is machined at the upper middle position of the two spiral oil grooves. Several blade-shaped grooves 11 are evenly distributed circumferentially inside the annular groove 10. The blade-shaped grooves 11 can be square, trapezoidal, or other shapes. The grooves are about 0.5mm lower than the mating surface. Since the crankshaft and the shaft hole are in a sealed state, when the crankshaft rotates, the blade-shaped grooves 11 rotate synchronously, generating a local negative pressure, which can increase the oil volume of the first oil groove 8, thereby improving the lubrication effect of the compressor, and ultimately improving the reliability of the compressor.

[0035] By comparing the oil volume of the two oil sump structures in the experiment, this patent relates to a new type of long-shaft spiral oil sump structure, which increases the oil volume per minute by 35% and reduces the internal temperature of the compressor by about 5°C.

[0036] In summary, by utilizing the above-mentioned technical solution of this utility model and through the optimized and improved design of the product of this utility model, the segmented spiral oil groove and the blade-shaped groove of the crankshaft oil groove structure work together to form a local negative pressure during rotation, thereby significantly improving the oil pumping efficiency. This achieves the purpose of reducing wear and seizure risk of compressor components and improving lubrication effect. At the same time, by enhancing heat dissipation capacity, it effectively suppresses motor overheating, cylinder head carbon deposits and oil deterioration, thus improving the overall reliability and service life of the compressor.

[0037] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A crankshaft structure for improving compressor reliability, characterized in that, The crankshaft comprises a long shaft section (1) and a short shaft section (3), the long shaft section (1) is internally provided with a long shaft oil hole (4) communicating with an oil pool, the outer surface of the long shaft section (1) is provided with a spiral oil groove, one end of the spiral oil groove is communicated with an oil feeding hole, the other end of the spiral oil groove extends to a shaft shoulder oil hole (5) and is communicated with the short shaft section (3), the spiral oil groove is divided into a first section oil groove (8) and a second section oil groove (9) along the axial direction, and an annular groove (10) is arranged between the first section oil groove (8) and the second section oil groove (9); a plurality of blade-shaped grooves (11) are arranged in the annular groove (10) in a circumferential direction, the depth of the blade-shaped grooves (11) is 0.3-0.7mm, and is lower than the matching surface of the long shaft section (1) and the shaft hole; the blade-shaped grooves (11) can improve the oil pumping amount of the long shaft oil hole (4) through local negative pressure when the crankshaft rotates.

2. A crankshaft structure for improving reliability of a compression engine according to claim 1, characterized in that, The cross-sectional shape of the blade-shaped grooves (11) is one of a square, a trapezoid or a circular arc.

3. A crankshaft structure for improving reliability of a compression engine according to claim 1, wherein The depth of the blade-shaped grooves (11) is 0.5mm.

4. The crankshaft structure for improving reliability of a compression engine according to claim 1, wherein The helix angle of the first section oil groove (8) and the second section oil groove (9) is twenty degrees to thirty degrees.

5. A crankshaft structure for improving reliability of a compression engine according to claim 1, wherein The helix angle of the first section oil groove (8) and the second section oil groove (9) is the same or different.

6. A crankshaft structure for improving reliability of a compression engine according to claim 1, wherein The axial width of the annular groove (10) is 1 / 5-1 / 10 of the total length of the long shaft section (1).

7. A crankshaft structure for improving reliability of a compression engine according to claim 1, wherein The helix directions of the first section oil groove (8) and the second section oil groove (9) are both right-handed, and the pitches of the two section oil grooves are the same.

8. A crankshaft structure for improving reliability of a compression engine according to claim 1, wherein The number of the blade-shaped grooves (11) in the annular groove (10) is 6-12, and the blade-shaped grooves (11) form continuous or intermittent fluid guiding channels in the annular groove (10).

Images