Crankshaft and rotor type compressor

Abstract

The invention provides a crankshaft and a rotor compressor. A groove is formed in the peripheral face of an eccentric part of the crankshaft and comprises an opening and a bottom face, the opening is formed in the peripheral face of the eccentric part, and the bottom face is arranged in a body of the eccentric part. The orthographic projection of the opening on the cross section of the eccentric part comprises an arc group, the arc group comprises at least one section of arc, and the total length of the arc group is smaller than the perimeter of the eccentric part; the orthographic projection of the bottom surface on the cross section of the eccentric part comprises a curve group, and the curve group comprises at least one section of curve; a connecting line between the first end point and the circle center of the eccentric part is a first line segment; the connecting line between the second end point and the circle center of the eccentric part is a second line segment, the included angle between the first line segment and the second line segment is alpha, and alpha meets 0 degree lt; alpha < = 180 degrees; the minimum distance between the curve and the circle center of the eccentric part is r, and r satisfies 1 / 2 < = r / Rlt; 1. According to the scheme, the lubricating effect between the eccentric part and the piston can be improved, friction power loss is reduced, and compressor performance is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of compressors, and in particular to a crankshaft and rotor type compressor. Background Art

[0002] The rotary compressor includes a crankshaft, a piston and a cylinder; the crankshaft includes an eccentric part; the piston is located in the cylinder and sleeved on the eccentric part, and there is a small gap between the piston and the eccentric part; when the eccentric part rotates, the eccentric part drives the piston to rotate. However, during the rotation of the eccentric part, the friction between the eccentric part and the piston is large, resulting in high friction power and low performance of the compressor. Summary of the invention

[0003] The present invention provides a crankshaft and a rotor type compressor to solve the technical problem of large friction between an eccentric part and a piston.

[0004] In order to solve the above technical problems, the present invention provides a crankshaft, comprising an eccentric portion, wherein a groove is arranged on the outer peripheral surface of the eccentric portion, wherein the groove comprises an opening and a bottom surface, wherein the opening is arranged on the outer peripheral surface of the eccentric portion, and the bottom surface is arranged in the body of the eccentric portion;

[0005] The orthographic projection of the opening on the cross section of the eccentric portion includes an arc group, the arc group includes at least one arc segment, the total length of the arc group is less than the circumference of the eccentric portion, and the cross section of the eccentric portion is perpendicular to the axis of the eccentric portion;

[0006] The orthographic projection of the bottom surface on the cross section of the eccentric portion includes a curve group, and the curve group includes at least one curve segment; the curve includes a first endpoint and a second endpoint, and a line connecting the first endpoint and the center of the eccentric portion is a first line segment; a line connecting the second endpoint and the center of the eccentric portion is a second line segment, and an angle between the first line segment and the second line segment is α, and α satisfies 0°<α≤180°; a minimum distance between the curve and the center of the eccentric portion is r, and r satisfies 1 / 2≤r / R<1, where R represents the radius of the eccentric portion.

[0007] Optionally, the curve group is an arc group; and the curves are all arcs.

[0008] Optionally, the arc group includes more than two arcs, and the endpoints of the more than two arcs are connected in sequence end to end.

[0009] Optionally, the groove passes through the upper end surface and the lower end surface of the eccentric portion.

[0010] Optionally, the groove is perpendicular to the upper end surface and the lower end surface of the eccentric portion.

[0011] Optionally, the groove is arranged in a spiral form on the outer peripheral surface of the eccentric portion.

[0012] Optionally, the spiral direction of the groove is opposite to the rotation direction of the eccentric portion.

[0013] Optionally, the orthographic projection of the bottom surface on the cross-section of the eccentric portion also includes a line segment group, and the line segment group includes at least one line segment; the line segment includes a third endpoint and a fourth endpoint, and the line between the third endpoint and the center of the eccentric portion is the third line segment; the line between the fourth endpoint and the center of the eccentric portion is the fourth line segment, and the angle between the third line segment and the fourth line segment is α; the minimum distance between the line segment and the center of the eccentric portion is r.

[0014] The present invention also provides a rotor-type compressor, comprising a crankshaft as described in any one of the above items.

[0015] Optionally, it further comprises a housing, a piston, an upper cylinder cover, a cylinder and a lower cylinder cover; the eccentric portion of the crankshaft and the piston are mounted inside the cylinder, the piston is sleeved on the eccentric portion, a gap is provided between the piston and the eccentric portion, and the eccentric portion is used to drive the piston to rotate; the upper cylinder cover is fixed on the upper end surface of the cylinder; the lower cylinder cover is fixed on the lower end surface of the cylinder;

[0016] An oil suction hole is provided on the axis of the crankshaft, an oil outlet hole is provided on the eccentric portion, and the oil outlet hole is communicated with the oil suction hole;

[0017] An oil pool is disposed at the bottom of the housing, and the oil suction hole is used to suck lubricating oil in the oil pool.

[0018] The present invention provides a crankshaft and a rotor compressor, wherein the groove is provided on the eccentric part of the crankshaft, and when the eccentric part drives the piston to rotate, the groove can reduce the contact area between the eccentric part and the piston, thereby reducing the friction between the eccentric part and the piston; lubricating oil can also enter the groove, and the lubricating oil can improve the lubrication effect between the eccentric part and the piston, reduce the friction power loss, and improve the performance of the compressor. The angle between the first line segment and the second line segment is α, and the α satisfies 0°<α≤180°, so that α is prevented from being too large and reducing the power of the eccentric part to drive the piston to rotate. The minimum distance between the curve and the center of the eccentric part is r, and the r satisfies 1 / 2≤r / R<1, so that the strength of the crankshaft and the lubrication effect of the groove can be taken into account, and the depth of the groove can be prevented from being too large or too small. If the depth of the groove is too large, the strength of the crankshaft will be reduced; if the depth of the groove is too small, there is too little lubricating oil in the groove, and the lubrication effect is poor. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a structural schematic diagram of a cross section of an eccentric portion of a crankshaft provided by an embodiment of the present invention.

[0020] Figure 2 It is a schematic structural diagram of a crankshaft with a groove provided on an eccentric portion provided by an embodiment of the present invention.

[0021] Figure 3 yes Figure 2 Schematic diagram of the right side.

[0022] Figure 4 It is a schematic structural diagram of a crankshaft with two grooves provided on an eccentric portion provided in one embodiment of the present invention.

[0023] Figure 5 yes Figure 4 Schematic diagram of the right side.

[0024] Figure 6 It is a schematic structural diagram of a crankshaft with a groove provided on an eccentric portion provided by an embodiment of the present invention.

[0025] Figure 7 yes Figure 6 Schematic diagram of the right side.

[0026] Figure 8 It is a partial schematic diagram of a rotor compressor provided by one embodiment of the present invention.

[0027] [Description of reference numerals is as follows]:

[0028] Crankshaft-1, slot-2, upper cylinder head-3, cylinder-4, lower cylinder head-5;

[0029] Eccentric part-11,

[0030] Outer peripheral surface-111, lower end surface-112, oil outlet hole-113;

[0031] Opening-21, bottom surface-22. DETAILED DESCRIPTION

[0032] In order to make the purpose, advantages and features of the present invention more clear, a crankshaft and rotor compressor proposed by the present invention is further described in detail below in conjunction with the accompanying drawings. It should be noted that the accompanying drawings are all in a very simplified form and are not in precise proportions, and are only used to conveniently and clearly assist in explaining the purpose of the embodiments of the present invention.

[0033] In the description of the present invention, the terms "first", "second", etc. are added for the convenience of description and reference, 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 by the terms "first", "second", etc. may explicitly or implicitly include one or more of the features.

[0034] like Figure 1-Figure 7 As shown, this embodiment provides a crankshaft 1, including an eccentric portion 11, a groove 2 is provided on the outer peripheral surface 111 of the eccentric portion 11, and the groove 2 includes an opening 21 and a bottom surface 22, the opening 21 is provided on the outer peripheral surface 111 of the eccentric portion 11, and the bottom surface 22 is provided in the body of the eccentric portion 11; the orthographic projection of the opening 21 on the cross section of the eccentric portion 11 includes an arc group, the arc group includes at least one arc, the total length of the arc group is less than the circumference of the eccentric portion 11, and the cross section of the eccentric portion 11 is perpendicular to the axis of the eccentric portion 11; the bottom surface 22 The orthographic projection on the cross section of the eccentric portion 11 includes a group of curves, and the group of curves includes at least one segment of curves; the curve includes a first endpoint and a second endpoint, and the line between the first endpoint and the center of the eccentric portion 11 is a first line segment; the line between the second endpoint and the center of the eccentric portion 11 is a second line segment, and the angle between the first line segment and the second line segment is α, and α satisfies 0°<α≤180°; the minimum distance between the curve and the center of the eccentric portion 11 is r, and r satisfies 1 / 2≤r / R<1, where R represents the radius of the eccentric portion 11. The outer peripheral surface 111 refers to the side surface of the eccentric portion 11, and the outer peripheral surface 111 is perpendicular to the upper end surface and the lower end surface 112 of the eccentric portion 11.

[0035] The present embodiment provides a crankshaft 1, wherein the groove 2 is provided on the eccentric portion 11 of the crankshaft 1. When the eccentric portion 11 drives the piston to rotate, the groove 2 can reduce the contact area between the eccentric portion 11 and the piston, thereby reducing the friction between the eccentric portion 11 and the piston. Lubricating oil can also enter the groove 2, and the lubricating oil can improve the lubrication effect between the eccentric portion 11 and the piston, reduce friction power loss, and improve compressor performance. The angle between the first line segment and the second line segment is α, and α satisfies 0°<α≤180°, so that α can be prevented from being too large to reduce the power of the eccentric portion 11 to drive the piston to rotate. The minimum distance between the curve and the center of the eccentric portion 11 is r, and r satisfies 1 / 2≤r / R<1. In this way, the strength of the crankshaft 1 and the lubrication effect of the groove 2 can be taken into account, and the depth of the groove 2 can be prevented from being too large or too small. If the depth of the groove 2 is too large, the strength of the crankshaft 1 will be reduced; if the depth of the groove 2 is too small, there will be too little lubricating oil in the groove 2, and the lubrication effect will be poor.

[0036] Optional, such as Figure 1 As shown, the curve group is an arc group; the curves are all arcs. The orthographic projection of the bottom surface 22 of the groove 2 on the cross section of the eccentric part 11 is an arc, which means that the depth of this section of the groove 2 is the same at each position, which is convenient for processing the groove 2 on the eccentric part 11. If the orthographic projection of the bottom surface 22 of the groove 2 on the cross section of the eccentric part 11 is a curve, it means that the depth of this section of the groove 2 can be the same or different at each position. When the depth of this section of the groove 2 is different at each position, when processing the groove 2, it is necessary to adjust the cutting depth of the cutter, which makes the processing more difficult. The groove 2 can also be directly cast.

[0037] Optional, such as Figure 1 and Figure 5 As shown, the arc group includes more than two arcs, and the endpoints of the two or more arcs are connected in sequence. This facilitates the processing of the groove 2. Figure 1 As shown, the arc line group includes three continuous arc lines N1, N2 and N3. In other embodiments, two or more arc lines may be arranged at intervals, that is, two or more grooves 2 may be arranged at intervals on the outer peripheral surface 111 of the eccentric portion 11.

[0038] Optional, such as Figure 1 and Figure 2 As shown, the groove 2 passes through the upper end surface and the lower end surface 112 of the eccentric portion 11. In this way, the opening 21 area of ​​the groove 2 can be increased and the groove 2 can be easily processed.

[0039] Optional, such as Figure 2 and Figure 4 As shown, the groove 2 is perpendicular to the upper end surface and the lower end surface 112 of the eccentric portion 11. In this way, the groove 2 can be easily processed.

[0040] Optional, reference Figure 1 and Figure 6 As shown, the groove 2 is arranged on the outer peripheral surface 111 of the eccentric portion 11 in a spiral form. Figure 6 and Figure 7 As shown, assuming that the crankshaft 1 rotates in the counterclockwise direction, the groove 2 spirals from the long axis side of the crankshaft 1 to the short axis side in the clockwise direction, so that the eccentric portion 11 can increase the amount of lubricating oil stored in the groove 2 when rotating.

[0041] Optional, reference Figure 1As shown, the orthographic projection of the bottom surface 22 on the cross section of the eccentric portion 11 also includes a line segment group, and the line segment group includes at least one line segment; the line segment includes a third endpoint and a fourth endpoint, and the line between the third endpoint and the center of the eccentric portion 11 is the third line segment; the line between the fourth endpoint and the center of the eccentric portion 11 is the fourth line segment, and the angle between the third line segment and the fourth line segment is α; the minimum distance between the line segment and the center of the eccentric portion 11 is r. The orthographic projection of the bottom surface 22 of the groove 2 on the cross section of the eccentric portion 11 can be a combination of a curve and a straight line, so that a variety of styles of crankshafts 1 can be formed, thereby providing compressors with a variety of styles and a variety of performances.

[0042] like Figure 8 As shown, based on the same technical concept as the above-mentioned crankshaft 1, this embodiment provides a rotor-type compressor, including a crankshaft 1 as described in any one of the above-mentioned items.

[0043] The present embodiment provides a rotor compressor, wherein the groove 2 is provided on the eccentric portion 11 of the crankshaft 1. When the eccentric portion 11 drives the piston to rotate, the groove 2 can reduce the contact area between the eccentric portion 11 and the piston, thereby reducing the friction between the eccentric portion 11 and the piston. Lubricating oil can also enter the groove 2, and the lubricating oil can improve the lubrication effect between the eccentric portion 11 and the piston, reduce friction power loss, and improve the performance of the compressor. The angle between the first line segment and the second line segment is α, and α satisfies 0°<α≤180°, so that α is prevented from being too large and reducing the power of the eccentric portion 11 to drive the piston to rotate. The minimum distance between the curve and the center of the eccentric portion 11 is r, and r satisfies 1 / 2≤r / R<1. In this way, the strength of the crankshaft 1 and the lubrication effect of the groove 2 can be taken into account, and the depth of the groove 2 can be prevented from being too large or too small. If the depth of the groove 2 is too large, the strength of the crankshaft 1 will be reduced; if the depth of the groove 2 is too small, there will be too little lubricating oil in the groove 2, and the lubrication effect will be poor.

[0044] Optional, such as Figure 1 and Figure 8As shown, the rotary compressor also includes a housing, a piston, an upper cylinder head 3, a cylinder 4 and a lower cylinder head 5; the eccentric part 11 of the crankshaft 1 and the piston are installed inside the cylinder 4, the piston sleeve is on the eccentric part 11, there is a gap between the piston and the eccentric part 11, and the eccentric part 11 is used to drive the piston to rotate; the upper cylinder head 3 is fixed on the upper end surface of the cylinder 4; the lower cylinder head 5 is fixed on the lower end surface 112 of the cylinder 4; an oil suction hole is provided on the axis of the crankshaft 1, and an oil outlet hole 113 is provided on the eccentric part 11, and the oil outlet hole 113 is connected to the oil suction hole; an oil pool is provided at the bottom of the housing, and the oil suction hole is used to suck the lubricating oil in the oil pool. The lubricating oil enters the gap between the eccentric part 11 and the piston from the oil suction hole and the outlet hole, and enters the groove 2, thereby improving the lubrication effect between the eccentric part 11 and the piston, reducing friction power loss, and improving the performance of the compressor.

[0045] In summary, the present invention provides a crankshaft 1 and a rotor compressor, wherein the groove 2 is provided on the eccentric portion 11 of the crankshaft 1. When the eccentric portion 11 drives the piston to rotate, the groove 2 can reduce the contact area between the eccentric portion 11 and the piston, thereby reducing the friction between the eccentric portion 11 and the piston; lubricating oil can also enter the groove 2, and the lubricating oil can improve the lubrication effect between the eccentric portion 11 and the piston, reduce friction power loss, and improve compressor performance. The angle between the first line segment and the second line segment is α, and α satisfies 0°<α≤180°, so that α is prevented from being too large and reducing the power of the eccentric portion 11 to drive the piston to rotate. The minimum distance between the curve and the center of the eccentric portion 11 is r, and r satisfies 1 / 2≤r / R<1. In this way, the strength of the crankshaft 1 and the lubrication effect of the groove 2 can be taken into account, and the depth of the groove 2 can be prevented from being too large or too small. If the depth of the groove 2 is too large, the strength of the crankshaft 1 will be reduced; if the depth of the groove 2 is too small, there will be too little lubricating oil in the groove 2, and the lubrication effect will be poor.

[0046] The above description is only a description of the preferred embodiments of the present invention, and is not intended to limit the scope of the present invention. Any changes or modifications made by a person skilled in the art based on the above disclosure shall fall within the protection scope of the present invention.

Claims

1. A crankshaft, characterized in that: It comprises an eccentric part, wherein a groove is arranged on the outer peripheral surface of the eccentric part, wherein the groove comprises an opening and a bottom surface, wherein the opening is arranged on the outer peripheral surface of the eccentric part, and the bottom surface is arranged in the body of the eccentric part; The orthographic projection of the opening on the cross section of the eccentric portion includes an arc group, the arc group includes at least one arc segment, the total length of the arc group is less than the circumference of the eccentric portion, and the cross section of the eccentric portion is perpendicular to the axis of the eccentric portion; The orthographic projection of the bottom surface on the cross section of the eccentric portion includes a curve group, and the curve group includes at least one curve segment; the curve includes a first endpoint and a second endpoint, and a line connecting the first endpoint and the center of the eccentric portion is a first line segment; a line connecting the second endpoint and the center of the eccentric portion is a second line segment, and an angle between the first line segment and the second line segment is α, and α satisfies 0°<α≤180°; a minimum distance between the curve and the center of the eccentric portion is r, and r satisfies 1 / 2≤r / R<1, where R represents the radius of the eccentric portion.

2. A crankshaft according to claim 1, characterized in that: The curve group is an arc group; and the curves are all arcs.

3. A crankshaft according to claim 2, characterized in that: The arc group includes more than two arcs, and the endpoints of the more than two arcs are connected in sequence end to end.

4. A crankshaft according to claim 1, characterized in that: The groove penetrates the upper end surface and the lower end surface of the eccentric portion.

5. A crankshaft according to claim 1, characterized in that: The groove is perpendicular to the upper end surface and the lower end surface of the eccentric portion.

6. A crankshaft according to claim 1, characterized in that: The groove is provided on the outer peripheral surface of the eccentric portion in a spiral form.

7. A crankshaft according to claim 6, characterized in that: The spiral direction of the groove is opposite to the rotation direction of the eccentric portion.

8. A crankshaft according to claim 1, characterized in that: The orthographic projection of the bottom surface on the cross section of the eccentric portion also includes a line segment group, and the line segment group includes at least one line segment; the line segment includes a third endpoint and a fourth endpoint, and the line between the third endpoint and the center of the eccentric portion is the third line segment; the line between the fourth endpoint and the center of the eccentric portion is the fourth line segment, and the angle between the third line segment and the fourth line segment is α; the minimum distance between the line segment and the center of the eccentric portion is r.

9. A rotor compressor, characterized in that: A crankshaft comprising any one of claims 1-8.

10. A rotary compressor according to claim 9, characterized in that: It also includes a housing, a piston, an upper cylinder cover, a cylinder and a lower cylinder cover; the eccentric portion of the crankshaft and the piston are installed inside the cylinder, the piston is sleeved on the eccentric portion, a gap is provided between the piston and the eccentric portion, and the eccentric portion is used to drive the piston to rotate; the upper cylinder cover is fixed on the upper end surface of the cylinder; the lower cylinder cover is fixed on the lower end surface of the cylinder; An oil suction hole is provided on the axis of the crankshaft, an oil outlet hole is provided on the eccentric portion, and the oil outlet hole is communicated with the oil suction hole; An oil pool is disposed at the bottom of the housing, and the oil suction hole is used to suck lubricating oil in the oil pool.

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