Crankshaft and compressor

Abstract

The invention relates to the technical field of compressors, in particular to a crankshaft and a compressor comprising the crankshaft. The crankshaft comprises a long shaft, an eccentric part and a short shaft which are sequentially connected from far to near in the axial direction, the long shaft is used for being assembled with a rotor inner hole of a motor, a long shaft oil groove extending in the axial direction is formed in the long shaft, the far end of the long shaft oil groove penetrates through the far end face of the long shaft, and the near end of the long shaft oil groove extends out of the near end face of the rotor inner hole and is closed. A long-shaft oil hole is formed in the near-end part, extending out of the rotor inner hole, of the long-shaft oil groove, one end of the long-shaft oil hole is communicated with the long-shaft oil groove, and the other end of the long-shaft oil hole penetrates through the peripheral surface of the long shaft. The long shaft oil groove and the long shaft oil hole are formed in the long shaft of the crankshaft to form a new refrigerant oil circulation loop, so that refrigerant oil on the upper portion of the motor can return to the lower portion of the motor through the loop, the oil accumulation condition on the upper portion of the motor is improved, the oil level on the upper portion of the motor is lowered, and the oil return condition in the compressor is improved.

Description

Technical Field

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

[0002] The rotor compressor is driven by a motor to rotate the crankshaft in the pump body to compress the refrigerant. The crankshaft includes a long shaft, an eccentric part and a short shaft connected in sequence. The motor is assembled with the long shaft, and the pump body is assembled with the eccentric part. Under the action of the centrifugal force of the crankshaft rotation, the short shaft pumps oil from the oil pool at the bottom of the compressor housing, introduces the refrigeration oil into the crankshaft and sends it to the moving parts for lubrication. In order to ensure the lubrication of the pump body during the operation of the compressor, the vanes and oil holes of the short shaft of the compressor crankshaft are usually considered to have a larger amount of pumping oil to ensure that the compressor will not have the problem of pump body wear when it runs for a long time at a low speed. The amount of oil pumped by the compressor will increase with the increase of speed. If the crankshaft stub pumps too much oil, a large amount of refrigerant oil will be pumped out at high speed and washed to the upper part of the motor by the refrigerant. The gap between the motor and the inner diameter of the compressor casing is small, and it is difficult for the refrigerant oil to return from the upper part of the motor to the bottom, which will cause the bottom of the compressor to be short of oil and the upper part of the motor to be full of oil. The oil level at the bottom of the casing will continue to decrease with the passage of time, and the oil distribution inside the compressor will be uneven. The reduced amount of pumped oil will affect the lubrication of the pump body, resulting in poor wear of the pump body. Summary of the invention

[0003] In view of the above-mentioned defects in the prior art, the technical problem to be solved by the present invention is to provide a crankshaft capable of improving the problem of high oil level on the upper part of the motor when the compressor runs at high speed.

[0004] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0005] The present invention provides a crankshaft, comprising a long shaft, an eccentric part and a short shaft which are connected in sequence from far to near along the axial direction, the long shaft is used to be assembled with the rotor inner hole of the motor, a long shaft oil groove extending along the axial direction is provided inside the long shaft, the distal end of the long shaft oil groove penetrates the distal end face of the long shaft, the proximal end of the long shaft oil groove extends to the outside of the proximal end face of the rotor inner hole and is closed, a long shaft oil hole is provided on the proximal end portion of the long shaft oil groove extending out of the rotor inner hole, one end of the long shaft oil hole is connected with the long shaft oil groove, and the other end penetrates the outer circumferential surface of the long shaft.

[0006] Preferably, a plurality of long-shaft oil holes are provided, and the plurality of long-shaft oil holes are all located on the proximal end portion of the long-shaft oil groove extending out of the inner hole of the rotor.

[0007] Preferably, a plurality of long-axis oil holes are provided, and the plurality of long-axis oil holes are distributed at intervals along the axial direction and / or circumferential direction of the long axis.

[0008] Preferably, a rotary vane is provided in the long shaft oil groove.

[0009] Preferably, the twisting direction of the vanes is opposite to the rotation direction of the crankshaft.

[0010] Preferably, a short shaft oil groove extending axially is provided inside the short shaft, the proximal end of the short shaft oil groove passes through the proximal end face of the short shaft, the distal end of the short shaft oil groove extends into the proximal end of the long shaft and is closed, and the proximal end of the long shaft oil groove and the distal end of the short shaft oil groove are not connected to each other.

[0011] Preferably, the sum of the axial extension length of the long-shaft oil groove and the axial extension length of the short-shaft oil groove is smaller than the axial extension length of the crankshaft.

[0012] Preferably, the long-axis oil groove and the short-axis oil groove are coaxially arranged.

[0013] Preferably, the long-shaft oil groove and the short-shaft oil groove are both arranged concentrically with the crankshaft.

[0014] The present invention also provides a compressor, comprising the crankshaft as described above.

[0015] Compared with the prior art, the present invention has significant improvements:

[0016] The present invention can form a new refrigeration oil circulation loop by arranging a long-shaft oil groove and a long-shaft oil hole inside the long-shaft of the crankshaft. The proximal end of the long-shaft oil groove is closed, which will not interfere with the crankshaft stub pump oil, and will not affect the crankshaft stub pump oil volume when the compressor is running. When the compressor is running at a high speed, the refrigeration oil brought to the upper part of the motor by the refrigerant can enter the long-shaft oil groove and leave the upper space of the motor, thereby improving the oil accumulation situation on the upper part of the motor and lowering the oil level on the upper part of the motor. The refrigeration oil entering the long-shaft oil groove can flow out from the long-shaft oil hole arranged on the proximal end of the long-shaft oil groove outside the inner hole of the rotor and return to the lower part of the motor, thereby realizing the oil return of the refrigeration oil on the upper part of the motor, forming a refrigeration oil circulation loop, and improving the oil return situation inside the compressor. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the long axis portion of the crankshaft according to an embodiment of the present invention.

[0018] Figure 2 It is a schematic diagram of the assembly of the long axis of the crankshaft and the motor rotor according to an embodiment of the present invention.

[0019] The reference numerals are described as follows:

[0020] 1 Long axis

[0021] 11 Long shaft oil groove

[0022] 12 Long shaft oil hole

[0023] 13 Short shaft oil groove

[0024] 14 Short shaft oil hole

[0025] 2 Rotors

[0026] 20 Rotor inner hole DETAILED DESCRIPTION

[0027] The specific embodiments of the present invention are further described in detail below in conjunction with the accompanying drawings. These embodiments are only used to illustrate the present invention, but not to limit the present invention.

[0028] In the description of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are 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 cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0029] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0030] Furthermore, in the description of the present invention, unless otherwise specified, “plurality” means two or more.

[0031] like Figure 1 and Figure 2 FIG. 1 is an embodiment of a crankshaft provided by the present invention. The crankshaft of this embodiment is used for a rotor compressor.

[0032] The crankshaft of this embodiment includes a long shaft 1, an eccentric portion and a short shaft which are connected in sequence from far to near along the axial direction. Figure 1 In the description of the present invention, the end of the long shaft 1 away from the eccentric portion is defined as the distal end of the crankshaft, and the distal end side is also defined as Figure 1 On the left side of the paper, Figure 2 The upper side of the paper; the end of the short shaft away from the eccentric part is defined as the proximal end of the crankshaft, and the proximal end side is also defined as Figure 1 To the right side of the paper, Figure 2 The bottom side of the paper.

[0033] The long axis 1 of the crankshaft is used to assemble with the rotor inner hole 20 of the motor rotor 2, that is, the motor of the compressor is fixed on the long axis 1 through the rotor inner hole 20 of the rotor 2, so that the motor rotor 2 drives the crankshaft to rotate. The eccentric part of the crankshaft is assembled in the pump body of the compressor, and a piston is sleeved on the eccentric part. When the crankshaft rotates, the eccentric part of the crankshaft drives the piston to perform eccentric operation in the pump body to compress the refrigerant entering the pump body. The short axis of the crankshaft is located on the side of the pump body away from the motor. Under the action of the centrifugal force of the rotation of the crankshaft, the short axis pumps the refrigerant oil in the oil pool at the bottom of the compressor housing into the crankshaft and sends it to the pump body and other moving parts for lubrication.

[0034] The crankshaft of this embodiment is provided with an axially extending long shaft oil groove 11 inside the long shaft 1. The distal end of the long shaft oil groove 11 passes through the distal end face of the long shaft 1, and the proximal end of the long shaft oil groove 11 extends to the outside of the proximal end face of the rotor inner bore 20 and is closed. That is, the long shaft oil groove 11 is a blind hole with a distal end that passes through and a proximal end that is closed. The axial extension length of the long shaft oil groove 11 is such that after the long shaft 1 is assembled with the rotor inner bore 20 of the motor rotor 2, the proximal end of the long shaft oil groove 11 is located outside the proximal end face of the rotor inner bore 20, that is, the axial extension length of the long shaft oil groove 11 is greater than the axial distance between the proximal end face of the rotor inner bore 20 and the distal end face of the long shaft 1. The proximal end face of the rotor inner bore 20 refers to the portion of the proximal end face of the motor rotor 2 that is located around the rotor inner bore 20. Figure 2 Taking the case where the crankshaft major axis 1 shown is pressed into the rotor inner hole 20 of the rotor 2, and the distal end face of the rotor 2 is higher than the distal end face of the major axis 1 by a distance H1 as an example, the axial distance between the distal end face of the rotor 2 and the proximal end face of the rotor inner hole 20 is H2, then the axial distance between the proximal end face of the rotor inner hole 20 and the distal end face of the major axis 1 is L=H2-H1, the axial extension length of the major axis oil groove 11 is L1, and satisfies: L1>H2-H1.

[0035] A long shaft oil hole 12 is provided at the proximal end of the long shaft oil groove 11 extending out of the rotor inner hole 20, one end of the long shaft oil hole 12 is connected to the long shaft oil groove 11, and the other end of the long shaft oil hole 12 passes through the outer peripheral surface of the long shaft 1. Preferably, the long shaft oil hole 12 extends along the radial direction of the crankshaft long shaft 1.

[0036] Therefore, the crankshaft of this embodiment can form a new refrigeration oil circulation loop by setting the long shaft oil groove 11 and the long shaft oil hole 12 inside the long shaft 1. The proximal end of the long shaft oil groove 11 is closed, which will not interfere with the crankshaft stub pump oil, and will not affect the crankshaft stub pump oil volume when the compressor is running. When the compressor is running at a high speed, the refrigeration oil brought to the upper part of the motor by the refrigerant can enter the long shaft oil groove 11 and leave the upper space of the motor, thereby improving the oil accumulation in the upper part of the motor and lowering the oil level in the upper part of the motor. The refrigeration oil entering the long shaft oil groove 11 can flow out from the long shaft oil hole 12 set on the proximal end of the long shaft oil groove 11 outside the rotor inner hole 20 and return to the lower part of the motor, thereby realizing the return of the refrigeration oil in the upper part of the motor, forming a refrigeration oil circulation loop, and improving the oil return situation inside the compressor.

[0037] In this embodiment, preferably, there are multiple long-shaft oil holes 12 on the long shaft 1, and the multiple long-shaft oil holes 12 are all located on the proximal end of the long-shaft oil groove 11 extending outside the rotor inner hole 20, so as to avoid being partially or completely blocked by the rotor inner hole 20, so as to ensure the formation of a complete refrigeration oil circuit and ensure that the refrigeration oil in the upper part of the motor can return to the lower part of the motor through the circuit. Figure 1 The diameter of the long shaft oil hole 12 closest to the distal end face of the long shaft 1 is d1, and the axial distance between the center of the long shaft oil hole 12 and the distal end face of the long shaft 1 is L2. Figure 2 Taking the case where the crankshaft long axis 1 is pressed into the rotor inner hole 20 of the rotor 2 as an example, the axial distance between the proximal end face of the rotor inner hole 20 and the distal end face of the long axis 1 is L=H2-H1, and satisfies: L≤L2-0.5*d1, thereby making all the long axis oil holes 12 located on the proximal end of the long axis oil groove 11 extending out of the rotor inner hole 20, ensuring the oil circuit effect of the refrigeration oil circulation circuit.

[0038] In this embodiment, the multiple long-axis oil holes 12 on the long axis 1 can be distributed at intervals along the axial direction of the long axis 1, that is, the long-axis oil holes 12 can be opened at different height positions in the axial direction of the long axis 1. The multiple long-axis oil holes 12 on the long axis 1 can also be distributed at intervals along the circumferential direction of the long axis 1, that is, multiple long-axis oil holes 12 can be opened at the same height position in the axial direction of the long axis 1. Of course, it is also possible to open long-axis oil holes 12 at different height positions in the axial direction of the long axis 1, and to open multiple long-axis oil holes 12 at the same height position in the axial direction of the long axis 1. The number of long-axis oil holes 12 opened on the long axis 1 is not limited, and the diameter size of each long-axis oil hole 12 is also not limited, and can be set to the same aperture, or can be set to different apertures, such as Figure 1The φd1 and φd2 shown can be equal or different, but the diameter of each long-axis oil hole 12 should not be greater than the diameter D1 of the long-axis oil groove 11. Preferably, the multiple long-axis oil holes 12 opened at the same height position in the axial direction of the long axis 1 have the same diameter size. The spacing angle between the multiple long-axis oil holes 12 opened at the same height position in the axial direction of the long axis 1 and spaced along the circumferential direction of the long axis 1 is not limited. Preferably, two long-axis oil holes 12 are opened at the same height position in the axial direction of the long axis 1, and the spacing angle between the two long-axis oil holes 12 is 180°.

[0039] In this embodiment, preferably, a rotary vane is provided in the long-shaft oil groove 11 to increase the pumping power of the long-shaft oil groove 11. Preferably, the torsion direction of the rotary vane installed in the long-shaft oil groove 11 is opposite to the rotation direction of the crankshaft, so that the refrigerant oil on the upper part of the motor can be pumped into the long-shaft oil groove 11 and pumped out to the long-shaft oil hole 12 to the greatest extent.

[0040] The crankshaft of this embodiment has a short shaft internally provided with a short shaft oil groove 13 extending in the axial direction, the proximal end of the short shaft oil groove 13 penetrates the proximal end surface of the short shaft, and the distal end of the short shaft oil groove 13 extends to the proximal end of the long shaft 1 and is closed. That is, the short shaft oil groove 13 is a blind hole with a proximal end penetrated and a distal end closed, and the axial extension length of the short shaft oil groove 13 is such that the distal end of the short shaft oil groove 13 passes through the eccentric part of the crankshaft and extends to the proximal end of the long shaft 1. The short shaft oil groove 13 is provided with a plurality of short shaft oil holes 14, one end of the short shaft oil hole 14 is connected to the short shaft oil groove 13, and the other end of the short shaft oil hole 14 penetrates the outer peripheral surface of the short shaft. Then, under the action of the centrifugal force of the crankshaft rotation, the refrigerant oil in the oil pool at the bottom of the compressor housing can be pumped into the short shaft oil groove 13 through the proximal end of the short shaft oil groove 13, and sent to the pump body and other moving parts through the short shaft oil holes 14 for lubrication. In this embodiment, the proximal end of the long-shaft oil groove 11 and the distal end of the short-shaft oil groove 13 are not connected to each other, so that the long-shaft oil groove 11 and the short-shaft oil groove 13 do not interfere with each other. Therefore, the setting of the long-shaft oil groove 11 will not interfere with the crankshaft short-shaft pump oil, and will not affect the crankshaft short-shaft pump oil volume when the compressor is running.

[0041] Preferably, the sum of the axial extension length L1 of the long shaft oil groove 11 and the axial extension length of the short shaft oil groove 13 is less than the axial extension length of the crankshaft. Therefore, there is a gap between the proximal end of the long shaft oil groove 11 and the distal end of the short shaft oil groove 13 in the axial direction of the crankshaft, so that the proximal end of the long shaft oil groove 11 and the distal end of the short shaft oil groove 13 are not connected to each other. That is, Figure 1 As shown, the axial distance L3 between the distal end face of the short shaft oil groove 13 and the distal end face of the long shaft 1 is greater than the axial extension length L1 of the long shaft oil groove 11, and the axial distance M between the distal end face of the short shaft oil groove 13 and the proximal end face of the long shaft oil groove 11 is M=L3-L1, and M>0.

[0042] In this embodiment, preferably, the long shaft oil groove 11 is coaxially arranged with the short shaft oil groove 13. Preferably, the long shaft oil groove 11 and the short shaft oil groove 13 are both concentrically arranged with the crankshaft. Of course, the crankshaft of this embodiment is not limited to the manner in which the long shaft oil groove 11 and the short shaft oil groove 13 are coaxially arranged, or the long shaft oil groove 11 and the short shaft oil groove 13 are both concentrically arranged with the crankshaft. The long shaft oil groove 11 and / or the short shaft oil groove 13 may be eccentrically arranged with the crankshaft.

[0043] Based on the crankshaft of the present invention, an embodiment of the present invention further provides a compressor. The compressor of this embodiment includes the crankshaft of this embodiment.

[0044] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and substitutions can be made without departing from the technical principles of the present invention. These improvements and substitutions should also be regarded as the scope of protection of the present invention.

Claims

1. A crankshaft, comprising a long shaft (1), an eccentric portion and a short shaft connected in sequence from far to near along the axial direction, wherein the long shaft (1) is used to be assembled with the inner hole (20) of the rotor of the motor, characterized in that: The long shaft (1) is provided with a long shaft oil groove (11) extending in the axial direction inside, the distal end of the long shaft oil groove (11) passes through the distal end surface of the long shaft (1), the proximal end of the long shaft oil groove (11) extends to the outside of the proximal end surface of the rotor inner hole (20) and is closed, and a long shaft oil hole (12) is provided on the proximal end of the long shaft oil groove (11) extending outside the rotor inner hole (20), one end of the long shaft oil hole (12) is connected to the long shaft oil groove (11), and the other end passes through the outer peripheral surface of the long shaft (1).

2. The crankshaft according to claim 1, characterized in that A plurality of the long-shaft oil holes (12) are provided, and the plurality of the long-shaft oil holes (12) are all located on the proximal end portion of the long-shaft oil groove (11) extending outside the rotor inner hole (20).

3. The crankshaft according to claim 1, characterized in that A plurality of the long shaft oil holes (12) are provided, and the plurality of the long shaft oil holes (12) are distributed at intervals along the axial direction and / or circumferential direction of the long shaft (1).

4. The crankshaft according to claim 1, characterized in that A rotary vane is arranged in the long shaft oil groove (11).

5. The crankshaft according to claim 4, characterized in that The twisting direction of the rotary vane is opposite to the rotation direction of the crankshaft.

6. The crankshaft according to claim 1, characterized in that A short shaft oil groove (13) extending in the axial direction is provided inside the short shaft, the proximal end of the short shaft oil groove (13) passes through the proximal end surface of the short shaft, the distal end of the short shaft oil groove (13) extends into the proximal end of the long shaft (1) and is closed, and the proximal end of the long shaft oil groove (11) and the distal end of the short shaft oil groove (13) are not connected to each other.

7. The crankshaft according to claim 6, characterized in that The sum of the axial extension length of the long-axis oil groove (11) and the axial extension length of the short-axis oil groove (13) is smaller than the axial extension length of the crankshaft.

8. The crankshaft according to claim 1, characterized in that The long-axis oil groove (11) and the short-axis oil groove (13) are coaxially arranged.

9. The crankshaft according to claim 1, characterized in that The long-axis oil groove (11) and the short-axis oil groove (13) are both arranged concentrically with the crankshaft.

10. A compressor, characterized in that: Comprising a crankshaft as claimed in any one of claims 1 to 9.

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