Crankshaft structure, pump body assembly and compressor

Abstract

The utility model provides a crankshaft structure, a pump body assembly and a compressor, and the crankshaft structure comprises a rotating shaft part which extends along a preset direction; the eccentric part is arranged on the rotating shaft part, and the eccentric part is eccentrically arranged relative to a central shaft of the rotating shaft part; wherein an annular groove is formed in the rotating shaft part, the annular groove extends in the circumferential direction of the rotating shaft part, the value range of the width of the annular groove is 0.5 mm to 5 mm, and the value range of the depth of the annular groove is 0.1 mm to 1 mm. According to the embodiment of the crankshaft structure, the technical problem that a crankshaft structure in the related technology is poor in lubricating effect is solved.

Description

Technical Field

[0001] The utility model relates to the field of compressors, and in particular to a crankshaft structure, a pump body assembly and a compressor. Background Art

[0002] The energy efficiency of a compressor is related to the working conditions of various friction pairs within the pump assembly. The crankshaft and main bearing are one of the most important friction pairs, and their lubrication performance directly affects the energy efficiency and service life of the entire machine.

[0003] In related technologies, in order to improve energy efficiency and reduce contact wear and lubrication between the main bearing and the crankshaft, a step-down design structure is adopted during the design process of the crankshaft to improve lubrication and friction contact. However, in actual use, the friction between the crankshaft and the main bearing is relatively large, making it difficult to improve the energy efficiency of the compressor.

[0004] It can be seen that there is a technical problem in the related art that the lubrication effect of the crankshaft structure is poor, and no effective solution has been proposed to this technical problem. Utility Model Content

[0005] The main purpose of the utility model is to provide a crankshaft structure, a pump body assembly and a compressor to solve the technical problem of poor lubrication effect of the crankshaft structure in the related art.

[0006] In order to achieve the above-mentioned purpose, according to one aspect of the present invention, a crankshaft structure is provided, including: a rotating shaft part, which is extended along a preset direction; an eccentric part, which is arranged on the rotating shaft part, and the eccentric part is eccentrically arranged relative to the center axis of the rotating shaft part; wherein, an annular groove is provided on the rotating shaft part, and the annular groove is extended along the circumference of the rotating shaft part, the width of the annular groove is in the range of 0.5mm to 5mm, and the depth of the annular groove is in the range of 0.1mm to 1mm.

[0007] Furthermore, the rotating shaft portion has a mating surface for mating with the bearing, and an annular groove is provided on the mating surface so that an annular cavity is formed between the rotating shaft portion and the bearing when the crankshaft structure is mated with the bearing.

[0008] Furthermore, the width and depth of the annular groove are uniformly set, and the annular groove is not connected to any hole structure or slot structure.

[0009] Furthermore, the depth of the annular groove is (D7-D6) / 2, wherein D7 is the diameter of the main body of the shaft portion, D6=a*D7, and the value range of a is 0.8 to 0.95.

[0010] Furthermore, the width of the annular groove is D2 = b*(D7-D6), and the value range of b is 1 to 2.5.

[0011] Furthermore, there are multiple annular grooves, and the multiple annular grooves are arranged in sequence and at intervals along a preset direction.

[0012] Furthermore, the number of annular grooves is an even number closest to c, where c = L / 10, L is the length of the mating surface of the shaft portion for mating with the bearing along a preset direction; and / or, the distance between two adjacent annular grooves is d*D2, where the value range of d is 5 to 7.5.

[0013] Furthermore, the rotating shaft portion includes a first shaft segment and a second shaft segment, the eccentric portion is arranged between the first shaft segment and the second shaft segment, the first shaft segment is used for transmission connection with the motor, wherein the annular groove is arranged on the first shaft segment.

[0014] According to another aspect of the present invention, a pump body assembly is provided, including: a cylinder structure; a first bearing and a second bearing, the cylinder structure is arranged between the first bearing and the second bearing; a crankshaft structure, the crankshaft structure is the above-mentioned crankshaft structure, the crankshaft structure can be rotatably passed through the center hole of the cylinder structure, and cooperates with the first bearing and the second bearing; a piston, the piston is installed on the eccentric part of the crankshaft structure.

[0015] According to another aspect of the present invention, a compressor is provided, which includes the above-mentioned pump body assembly.

[0016] The crankshaft structure of the embodiment of the present invention includes: a rotating shaft portion, which extends along a preset direction; an eccentric portion, which is arranged on the rotating shaft portion and is eccentrically arranged relative to the central axis of the rotating shaft portion; wherein the rotating shaft portion is provided with an annular groove, which extends along the circumference of the rotating shaft portion, and the width of the annular groove ranges from 0.5mm to 5mm, and the depth of the annular groove ranges from 0.1mm to 1mm. The crankshaft structure of the embodiment of the present application adopts the above-mentioned structural design. By designing annular grooves with appropriate width and depth values ​​on the rotating shaft portion, lubricating oil can flow along the annular grooves, thereby increasing the fluidity of the lubricating oil along the circumference of the rotating shaft portion. The annular groove of this structural size can have a good lubricating oil pressure equalization effect. The lubricating oil can flow from the load-bearing surface area to the non-load-bearing surface area along the annular groove, thereby reducing the peak pressure of the lubricating oil film and increasing the valley pressure of the lubricating oil film, thereby improving the lubrication pressure difference, so that the lubricating oil film is better distributed along the circumference of the rotating shaft part, ensuring that the lubricating oil film is not punctured, and then ensuring the lubrication effect of the crankshaft structure, solving the technical problem of poor lubrication effect of the crankshaft structure in related technologies. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The drawings constituting part of this application are provided to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are provided to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0018] Figure 1 This is a schematic structural diagram of an embodiment of a crankshaft structure of the present invention;

[0019] Figure 2 This is a schematic cross-sectional view of an embodiment of a crankshaft structure of the present invention;

[0020] Figure 3 This is a schematic structural diagram of an embodiment of a compressor of the present utility model;

[0021] Figure 4 A schematic diagram of the lubricating oil film pressure distribution when the crankshaft structure in the related art is working;

[0022] Figure 5 This is a schematic diagram of the lubricating oil film pressure distribution of an embodiment of the crankshaft structure of the present utility model when working.

[0023] The above drawings include the following reference numerals:

[0024] 1. Rotating shaft; 11. First shaft section; 12. Second shaft section; 2. Eccentric portion; 10. Annular groove; 20. Cylinder structure; 30. First bearing; 40. Second bearing; 50. Crankshaft structure; 60. Piston; 70. Motor; 71. Stator; 72. Rotor. DETAILED DESCRIPTION

[0025] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments in this application can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0026] Please refer to Figures 1 to 5 In order to achieve the above-mentioned purpose, an embodiment of the present invention provides a crankshaft structure, which includes: a rotating shaft portion 1, which extends along a preset direction; an eccentric portion 2, which is arranged on the rotating shaft portion 1, and is eccentrically arranged relative to the central axis of the rotating shaft portion 1; wherein, an annular groove 10 is provided on the rotating shaft portion 1, and the annular groove 10 extends along the circumference of the rotating shaft portion 1, the width of the annular groove 10 ranges from 0.5 mm to 5 mm, and the depth of the annular groove 10 ranges from 0.1 mm to 1 mm.

[0027] The applicant's research has found that the poor lubrication effect of the crankshaft structure in the related art is due to its eccentric structure. When the crankshaft structure rotates, the side surfaces of the rotating shaft portion 1 in different directions are subject to different extrusion forces. In other words, there are load-bearing surfaces and non-load-bearing surfaces, which causes the lubricating oil film pressure in the load-bearing surface area to increase and the lubricating oil film pressure in the non-load-bearing surface area to decrease. When the lubricating oil film pressure in the load-bearing surface area is too high, the lubricating oil film may be punctured, resulting in lubrication failure. In contrast, the crankshaft structure of the present application adopts the above-mentioned structural design. By designing an annular groove 10 with appropriate width and depth values ​​on the rotating shaft portion 1, the lubricating oil can flow along the annular groove 10, thereby increasing the fluidity of the lubricating oil along the circumference of the rotating shaft portion 1. The annular groove 10 of this structural size can produce a good lubricating oil pressure equalization effect. The lubricating oil can flow from the load-bearing surface area to the non-load-bearing surface area along the annular groove 10, thereby reducing the peak pressure of the lubricating oil film, increasing the valley pressure of the lubricating oil film, and improving the lubrication pressure difference, so that the lubricating oil film is better distributed along the circumference of the rotating shaft part 1, ensuring that the lubricating oil film is not broken down, and then ensuring the lubrication effect of the crankshaft structure, solving the technical problem of poor lubrication effect of the crankshaft structure in related technologies.

[0028] like Figure 4 and Figure 5 As shown, Figure 4 This is a schematic diagram of the lubricating oil film pressure distribution when the crankshaft structure in the related art is working. Figure 5 This diagram illustrates the lubricating oil film pressure distribution during operation of an embodiment of the crankshaft structure of the present invention. Designing an annular groove 10 with the aforementioned dimensional parameters on the crankshaft's rotating shaft portion 1 improves the lubricating oil film's circumferential fluidity and evenly distributes the lubricating oil pressure, effectively preventing the lubricating oil film from rupturing due to excessive pressure.

[0029] Specifically, the rotating shaft portion 1 has a mating surface for mating with the bearing, and the annular groove 10 is provided on the mating surface to form an annular cavity between the rotating shaft portion 1 and the bearing when the crankshaft structure is mated with the bearing.

[0030] By designing the annular groove 10 on the mating surface, when the crankshaft structure is mated with the bearing, an annular cavity is formed between the rotating shaft part 1 and the bearing, thereby increasing the circumferential fluidity of the lubricating oil through the annular cavity, thereby improving the lubrication pressure difference and ensuring the lubrication effect.

[0031] In a preferred embodiment, the width and depth of the annular groove 10 are uniformly set, and the annular groove 10 is not connected to any hole structure or slot structure.

[0032] In this embodiment, the width and depth of the annular groove 10 are evenly set, thereby improving the pressure equalization effect of the lubricating oil. The annular groove 10 is not connected to any other hole structure or groove structure, ensuring that the lubricating oil only flows in a circular shape along the annular groove 10, thereby ensuring the circumferential pressure equalization effect.

[0033] In this embodiment, the depth of the annular groove 10 is (D7-D6) / 2, wherein D7 is the diameter of the main body of the shaft portion 1, D6=a*D7, and the value range of a is 0.8 to 0.95.

[0034] like Figure 2 As shown, by designing the depth of the annular groove 10 to be (D7-D6) / 2, where D7 is the diameter of the main body of the shaft portion 1, D6=a*D7, and a is in the range of 0.8 to 0.95, the annular groove 10 within this depth range can effectively increase the circumferential fluidity of the lubricating oil without affecting the smooth formation of the lubricating oil film, thereby ensuring the lubrication effect of the crankshaft structure.

[0035] Specifically, the width of the annular groove 10 is D2 = b*(D7-D6), and the value of b ranges from 1 to 2.5.

[0036] In actual implementation, the width of the annular groove 10 also affects the state of the lubricating oil film, thereby affecting the lubrication effect of the crankshaft structure. If the annular groove 10 is too wide, the bearing area will be reduced, which is not conducive to maintaining the lubricating oil film. If the annular groove is too narrow, it will not be conducive to the circumferential flow of the lubricating oil. In this embodiment, by designing the width of the annular groove 10 to D2 = b*(D7-D6), where b has a value range of 1 to 2.5, the flowability of the lubricating oil along the circumference of the crankshaft structure is improved without affecting the state of the lubricating oil film, thereby improving the lubrication pressure difference and ensuring the lubrication effect.

[0037] Preferably, there are multiple annular grooves 10, and the multiple annular grooves 10 are sequentially spaced apart along a preset direction.

[0038] By designing multiple annular grooves 10, the circumferential flow effect of the lubricating oil at different axial positions can be enhanced, thereby improving the pressure equalization effect, making the lubricating oil more evenly distributed, and ensuring the lubrication effect of the crankshaft structure.

[0039] In this embodiment, the number of annular grooves 10 is an even number closest to c, where c = L / 10, L is the length of the mating surface of the shaft portion 1 for mating with the bearing along a preset direction; and / or, the distance between two adjacent annular grooves 10 is d*D2, where the value range of d is 5 to 7.5.

[0040] For example, assuming the main bearing height is 54 mm and the length of the mating surface along a predetermined direction is L = 54 mm, then c = 54 / 10 = 5.4, and the closest even number is 6, so the number of annular grooves 10 is determined to be 6. In this embodiment, the number of annular grooves 10 is determined based on the mating length between the crankshaft structure and the bearing. The longer the mating surface, the greater the number of annular grooves 10, and the number of annular grooves is an even number. Preferably, the multiple annular grooves 10 are symmetrically distributed on the mating surface along the predetermined direction, thereby further improving the uniformity of the lubricating oil film pressure distribution.

[0041] Specifically, the rotating shaft portion 1 includes a first shaft segment 11 and a second shaft segment 12 , the eccentric portion 2 is arranged between the first shaft segment 11 and the second shaft segment 12 , the first shaft segment 11 is used for transmission connection with the motor, wherein the annular groove 10 is arranged in the first shaft segment 11 .

[0042] According to the different working environments of the first shaft section 11 and the second shaft section 12, the annular groove 10 is designed on the first shaft section 11 to make the oil film between the crankshaft structure and the main load-bearing bearing more evenly distributed, thereby ensuring the lubrication effect of the crankshaft structure.

[0043] In a specific embodiment, Figure 2 As shown, there are four annular grooves 10, pointing along the second shaft segment 12 toward the first shaft segment 11. These four annular grooves 10 are defined as the first, second, third, and fourth grooves, respectively. The first groove is located at a distance D1 from the end of the second shaft segment 12, the second groove is located at a distance D3 from the first groove, the third groove is located at a distance D4 from the first groove, and the fourth groove is located at a distance D5 from the first groove. In this embodiment, D1 = 45 mm, D3 = 7.5 mm, D4 = 25.5 mm, D5 = 33 mm, and D7 = 13 mm.

[0044] In addition, an embodiment of the present invention also provides a pump body assembly, which includes: a cylinder structure 20; a first bearing 30 and a second bearing 40, the cylinder structure 20 is arranged between the first bearing 30 and the second bearing 40; a crankshaft structure 50, the crankshaft structure 50 is the above-mentioned crankshaft structure, the crankshaft structure 50 can be rotatably passed through the center hole of the cylinder structure 20, and cooperate with the first bearing 30 and the second bearing 40; a piston 60, the piston 60 is installed on the eccentric part 2 of the crankshaft structure 50.

[0045] In addition, an embodiment of the present invention further provides a compressor, which includes the above-mentioned pump body assembly.

[0046] In a specific implementation, the pump body of the compressor is gradually connected to the crankshaft structure 50 of the motor 70, so that the crankshaft structure 50 is driven to rotate by the motor 70. Specifically, the motor 70 includes a stator 71 and a rotor 72, and the crankshaft structure 50 is connected to the rotor 72.

[0047] From the above description, it can be seen that the above embodiments of the present invention achieve the following technical effects:

[0048] The crankshaft structure of the embodiment of the present invention includes: a rotating shaft portion 1, which is extended along a preset direction; an eccentric portion 2, which is arranged on the rotating shaft portion 1 and is eccentrically arranged relative to the central axis of the rotating shaft portion 1; wherein, an annular groove 10 is provided on the rotating shaft portion 1, and the annular groove 10 is extended along the circumference of the rotating shaft portion 1, and the width of the annular groove 10 is in the range of 0.5mm to 5mm, and the depth of the annular groove 10 is in the range of 0.1mm to 1mm. The crankshaft structure of the embodiment of the present application adopts the above-mentioned structural design. By designing the annular groove 10 with appropriate width and depth values ​​on the rotating shaft portion 1, the lubricating oil can flow along the annular groove 10, thereby increasing the fluidity of the lubricating oil along the circumference of the rotating shaft portion 1. The annular groove 10 of this structural size can have a good lubricating oil pressure equalization effect. The lubricating oil can flow from the load-bearing surface area to the non-load-bearing surface area along the annular groove 10, thereby reducing the peak pressure of the lubricating oil film and increasing the valley pressure of the lubricating oil film, thereby improving the lubrication pressure difference, so that the lubricating oil film is better distributed along the circumference of the rotating shaft part 1, ensuring that the lubricating oil film is not punctured, and then ensuring the lubrication effect of the crankshaft structure, solving the technical problem of poor lubrication effect of the crankshaft structure in related technologies.

[0049] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used herein to describe the spatial positional relationship of a device or feature to other devices or features as shown in the figures. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figures. For example, if the device in the drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0050] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, operations, devices, components and / or combinations thereof.

[0051] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable where appropriate, so that the embodiments of the present application described herein can, for example, be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device comprising a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0052] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that the present invention is susceptible to various modifications and variations. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A crankshaft structure, characterized in that: include: A rotating shaft portion (1), wherein the rotating shaft portion (1) is extended along a preset direction; an eccentric portion (2), the eccentric portion (2) being arranged on the rotating shaft portion (1), the eccentric portion (2) being arranged eccentrically relative to the central axis of the rotating shaft portion (1); The shaft portion (1) is provided with an annular groove (10), which extends along the circumference of the shaft portion (1), and the width of the annular groove (10) is in the range of 0.5 mm to 5 mm, and the depth of the annular groove (10) is in the range of 0.1 mm to 1 mm.

2. The crankshaft structure according to claim 1, characterized in that: The rotating shaft part (1) has a matching surface for matching with the bearing, and the annular groove (10) is provided on the matching surface so as to form an annular cavity between the rotating shaft part (1) and the bearing when the crankshaft structure matches with the bearing.

3. The crankshaft structure according to claim 1, characterized in that: The width and depth of the annular groove (10) are evenly arranged, and the annular groove (10) is not connected to any hole structure or slot structure.

4. The crankshaft structure according to claim 1, characterized in that: The depth of the annular groove (10) is (D7-D6) / 2, wherein D7 is the diameter of the main body of the rotating shaft part (1), D6=a*D7, and the value range of a is 0.8 to 0.

95.

5. The crankshaft structure according to claim 4, characterized in that: The width of the annular groove (10) is D2=b*(D7-D6), and the value range of b is 1 to 2.

5.

6. The crankshaft structure according to claim 5, characterized in that: There are a plurality of annular grooves (10), and the plurality of annular grooves (10) are sequentially spaced apart along the preset direction.

7. The crankshaft structure according to claim 6, characterized in that: The number of the annular grooves (10) is an even number closest to c, wherein c=L / 10, L is the length of the mating surface of the shaft portion (1) for mating with the bearing along the preset direction; and / or the distance between two adjacent annular grooves (10) is d*D2, wherein the value range of d is 5 to 7.

5.

8. The crankshaft structure according to claim 1, characterized in that: The rotating shaft portion (1) comprises a first shaft segment (11) and a second shaft segment (12), the eccentric portion (2) is arranged between the first shaft segment (11) and the second shaft segment (12), the first shaft segment (11) is used for transmission connection with the motor, wherein the annular groove (10) is arranged on the first shaft segment (11).

9. A pump assembly, characterized in that: include: Cylinder structure (20); a first bearing (30) and a second bearing (40), wherein the cylinder structure (20) is disposed between the first bearing (30) and the second bearing (40); A crankshaft structure (50), wherein the crankshaft structure (50) is the crankshaft structure according to any one of claims 1 to 8, wherein the crankshaft structure (50) is rotatably disposed in a center hole of the cylinder structure (20) and cooperates with the first bearing (30) and the second bearing (40); A piston (60) is mounted on the eccentric portion (2) of the crankshaft structure (50).

10. A compressor, characterized in that: The compressor includes the pump body assembly according to claim 9.

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