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, a long shaft oil groove which extends in the axial direction and is closed at the near end is formed in the far end face of the long shaft, a short shaft oil groove which extends in the axial direction and is closed at the far end is formed in the near end face of the short shaft, and the far end of the short shaft oil groove at least extends into the eccentric part. The long-axis oil groove and the short-axis oil groove are not coaxially arranged and are not communicated with each other, long-axis oil holes are formed in the long-axis oil groove, one end of each long-axis oil hole is communicated with the long-axis oil groove, the other end of each long-axis oil hole penetrates through the peripheral face of the crankshaft, and at least one long-axis oil hole is located in the near-end end of the long-axis oil groove. Refrigeration oil on the upper portion of the motor can enter the long-shaft oil groove and flow back to the lower portion of the motor from the long-shaft oil hole, so that 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, refrigeration oil return on the upper portion of the motor is achieved, a refrigeration oil circulation loop is formed, 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 drive the crankshaft to run 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 refrigerant oil into the crankshaft and sends it to the moving parts for lubrication. When the existing rotor compressor is in operation, the refrigerant oil pumped out from the bottom of the compressor housing is brought to the upper part of the motor by the refrigerant and is difficult to return to the lower part of the pump body, so it accumulates in the space above the motor, causing the oil level at the bottom of the compressor housing to continue to decrease over time, the oil volume inside the compressor is unevenly distributed, and the reduced pump oil volume affects 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 of the prior art, the technical problem to be solved by the present invention is to provide a crankshaft which can improve the problem of high oil level on the upper part of the motor in the compressor and improve the oil return condition inside the compressor.

[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, a long shaft oil groove extending along the axial direction and closed at the proximal end is opened on the distal end surface of the long shaft, a short shaft oil groove extending along the axial direction and closed at the distal end is opened on the proximal end surface of the short shaft, the distal end of the short shaft oil groove at least extends into the eccentric part, the long shaft oil groove and the short shaft oil groove are non-coaxially arranged and are not connected to each other, a long shaft oil hole is provided on the long shaft oil groove, one end of which is connected to the long shaft oil groove and the other end passes through the outer peripheral surface of the crankshaft, and at least one long shaft oil hole is located on the proximal end of the long shaft oil groove.

[0006] Preferably, the major shaft oil groove and / or the minor shaft oil groove are / is not arranged concentrically with the crankshaft.

[0007] 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 greater than the axial extension length of the crankshaft.

[0008] Preferably, the proximal end of the long shaft oil groove extends into the eccentric portion.

[0009] Preferably, the proximal end of the major shaft oil groove extends to one end side of the eccentric portion close to the minor shaft.

[0010] Preferably, the distal end of the short shaft oil groove extends into the long shaft.

[0011] Preferably, the short shaft oil groove is provided with a short shaft oil hole, one end of which is connected to the short shaft oil groove and the other end passes through the outer peripheral surface of the crankshaft, at least one short shaft oil hole is located in the eccentric part, and the short shaft oil hole and the long shaft oil hole are not connected to each other.

[0012] Preferably, the major axis oil holes and the minor axis oil holes are distributed at intervals along the axial direction and / or circumferential direction of the crankshaft.

[0013] Preferably, the interval angle between adjacent long-axis oil holes and short-axis oil holes distributed at intervals along the circumference of the crankshaft is 90°-270°.

[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 crankshaft of the present invention has a non-coaxial extension of the long-shaft oil groove and a non-interconnected long-shaft oil groove, so the axial extension length of the long-shaft oil groove is not limited by the axial extension length of the short-shaft oil groove, and the proximal end of the long-shaft oil groove will not interfere with the short-shaft oil groove. Therefore, the proximal end of the long-shaft oil groove can be extended to a position closer to the short-shaft in the crankshaft without affecting the axial extension length of the short-shaft oil groove, interfering with the crankshaft short-shaft pump oil, and affecting the crankshaft short-shaft pump oil volume, so that the long-shaft oil hole on the proximal end of the long-shaft oil groove is away from the motor and closer to the short-shaft. Thus, when the compressor is running, 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 back to the pump body from the long-shaft oil hole, which can not only realize the oil return of the refrigeration oil on the upper part of the motor and form a refrigeration oil circulation loop, but also enhance the lubrication of the pump body and improve the oil return situation inside the compressor. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 Schematic diagram of the structure of a crankshaft according to an embodiment of the present invention.

[0018] Figure 2 yes Figure 1 Schematic cross-sectional view along AA / BB direction.

[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] 2 Eccentric part

[0024] 3 Short axis

[0025] 31 Short shaft oil groove

[0026] 32 Short shaft oil 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] See also Figure 1 The crankshaft of this embodiment includes a long shaft 1, an eccentric portion 2 and a short shaft 3 which are connected in sequence from far to near along the axial direction. In the description of the present invention, the end of the long shaft 1 away from the eccentric portion 2 is defined as the distal end of the crankshaft, and the distal end side is also defined as Figure 1 The left side of the paper; the end of the short shaft 3 away from the eccentric part 2 is defined as the proximal end of the crankshaft, and the proximal end side is also Figure 1 to the right side of the paper.

[0033] The long axis 1 of the crankshaft is used for assembly with the motor. The motor of the compressor can be fixed on the long axis 1 through the inner hole of the rotor, so that the motor rotor drives the crankshaft to rotate. The eccentric part 2 of the crankshaft is assembled in the pump body of the compressor. The eccentric part 2 is sleeved with a piston. When the crankshaft rotates, the eccentric part 2 drives the piston to perform eccentric operation in the pump body to compress the refrigerant entering the pump body. The short axis 3 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 crankshaft rotation, the short axis 3 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 has a long shaft oil groove 11 extending axially and closed at the proximal end on the distal end face of the long shaft 1, that is, the long shaft oil groove 11 is provided inside the long shaft 1, and the long shaft oil groove 11 extends axially along the long shaft 1, and the distal end of the long shaft oil groove 11 penetrates the distal end face of the long shaft 1, and the proximal end of the long shaft oil groove 11 is closed, so the long shaft oil groove 11 is a blind hole with a distal end penetrated and a proximal end closed. The long shaft oil groove 11 is provided with a long shaft oil hole 12, 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 penetrates the outer peripheral surface of the crankshaft. Preferably, the long shaft oil hole 12 extends radially along the long shaft 1 of the crankshaft. The long shaft oil groove 11 may be provided with a plurality of long shaft oil holes 12, and at least one long shaft oil hole 12 is located at the proximal end of the long shaft oil groove 11.

[0035] A short shaft oil groove 31 extending in the axial direction and closed at the distal end is provided on the proximal end face of the short shaft 3, that is, a short shaft oil groove 31 is provided inside the short shaft 3, the short shaft oil groove 31 extends in the axial direction of the short shaft 3, the proximal end of the short shaft oil groove 31 penetrates the proximal end face of the short shaft 3, and the distal end of the short shaft oil groove 31 is closed, so the short shaft oil groove 31 is a blind hole with a proximal through end and a distal closed end. The distal end of the short shaft oil groove 31 extends at least into the eccentric part 2. A short shaft oil hole 32 is provided on the short shaft oil groove 31, one end of the short shaft oil hole 32 is connected to the short shaft oil groove 31, and the other end of the short shaft oil hole 32 penetrates the outer peripheral surface of the crankshaft. Preferably, the short shaft oil hole 32 extends in the radial direction of the short shaft 3 of the crankshaft. A plurality of short shaft oil holes 32 may be provided on the short shaft oil groove 31, and at least one short shaft oil hole 32 is located in the eccentric part 2. Under the action of the centrifugal force of the crankshaft rotation, the refrigeration 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 active parts through the short shaft oil hole 14 for lubrication. Preferably, the short shaft oil hole 32 and the long shaft oil hole 12 are not connected to each other.

[0036] In this embodiment, the long shaft oil groove 11 and the short shaft oil groove 31 are non-coaxially arranged, and the long shaft oil groove 11 and the short shaft oil groove 31 are not connected to each other, that is, the proximal end of the long shaft oil groove 11 and the distal end of the short shaft oil groove 31 are not connected to each other. Since the long shaft oil groove 11 and the short shaft oil groove 31 are non-coaxially extended and are not connected to each other, the axial extension length of the long shaft oil groove 11 is not limited by the axial extension length of the short shaft oil groove 31, and the proximal end of the long shaft oil groove 11 will not interfere with the short shaft oil groove 31. Therefore, the proximal end of the long shaft oil groove 11 can be extended to a position closer to the short shaft 3 in the crankshaft without affecting the axial extension length of the short shaft oil groove 31, interfering with the oil pumping of the crankshaft short shaft 3, and affecting the oil pumping amount of the crankshaft short shaft 3, so that the long shaft oil hole 12 on the proximal end of the long shaft oil groove 11 is away from the motor and closer to the short shaft 3. Therefore, when the compressor is running, the refrigerant 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 on the upper part of the motor and lowering the oil level on the upper part of the motor. The refrigerant oil entering the long-shaft oil groove 11 can flow back to the pump body from the long-shaft oil hole 12, which not only can realize the return of the refrigerant oil on the upper part of the motor and form a refrigerant oil circulation loop, but also can enhance the lubrication of the pump body and improve the oil return situation inside the compressor.

[0037] In this embodiment, the long shaft oil groove 11 and the crankshaft may be arranged non-concentrically, and the short shaft oil groove 31 and the crankshaft may also be arranged non-concentrically. In a preferred embodiment, both the long shaft oil groove 11 and the short shaft oil groove 31 are arranged non-concentrically with the crankshaft.

[0038] In this embodiment, preferably, the sum of the axial extension length L1 of the long shaft oil groove 11 and the axial extension length L2 of the short shaft oil groove 31 is greater than the axial extension length of the crankshaft. As a result, the long shaft oil groove 11 and the short shaft oil groove 31 have an overlapping portion in the radial direction of the crankshaft, which can simultaneously meet the axial extension dimension requirements of the long shaft oil groove 11 and the short shaft oil groove 31.

[0039] In this embodiment, the axial extension length L2 of the stub oil groove 31 is smaller than the axial extension length of the crankshaft, so as to achieve the far end closure of the stub oil groove 31 .

[0040] Preferably, the distal end of the short shaft oil groove 31 extends into the long shaft 1 , so that the short shaft oil groove 31 passes through the eccentric portion 2 , thereby ensuring the overall lubrication effect on the pump body.

[0041] In this embodiment, the axial extension length L1 of the long shaft oil groove 11 is smaller than the axial extension length of the crankshaft, so as to achieve the proximal closure of the long shaft oil groove 11 .

[0042] Preferably, the proximal end of the long-shaft oil groove 11 extends into the eccentric part 2, and at least the long-shaft oil hole 12 located on the proximal end of the long-shaft oil groove 11 is located in the eccentric part 2. The refrigerant oil entering the long-shaft oil groove 11 from the upper part of the motor can enter between the eccentric part 2 and the compressor pump body from the long-shaft oil hole 12 on the proximal end of the long-shaft oil groove 11 to lubricate the pump body. As a result, the refrigerant oil on the upper part of the motor can be directly sent back to the pump body for lubrication through the long-shaft oil groove 11, thereby increasing the oil circulation loop of the pump body inside the compressor and improving the situation of local oil imbalance. Preferably, the proximal end of the long-shaft oil groove 11 extends to one end side of the eccentric part 2 close to the short shaft 3, which can achieve a better pump body lubrication effect.

[0043] In this embodiment, the number of long-axis oil holes 12 set on the long-axis oil groove 11 is not limited, the diameter d1 of each long-axis oil hole 12 set on the long-axis oil groove 11 is not greater than the diameter D1 of the long-axis oil groove 11, and the diameter size of each long-axis oil hole 12 is not limited, and can be set to the same aperture or different apertures.

[0044] In this embodiment, the number of short-shaft oil holes 32 set on the short-shaft oil groove 31 is not limited, the diameter d2 of each short-shaft oil hole 32 set on the short-shaft oil groove 31 is not greater than the diameter D2 of the short-shaft oil groove 31, and the diameter size of each short-shaft oil hole 32 is not limited, and can be set to the same aperture or different apertures.

[0045] In this embodiment, the long-axis oil holes 12 on the long-axis oil groove 11 are distributed at intervals along the axial direction of the long-axis oil groove 11, and the short-axis oil holes 32 on the short-axis oil groove 31 are distributed at intervals along the axial direction of the short-axis oil groove 31. The long-axis oil holes 12 on the long-axis oil groove 11 and the short-axis oil holes 32 on the short-axis oil groove 31 can be distributed at intervals along the axial direction of the crankshaft, that is, the long-axis oil holes 12 and the short-axis oil holes 32 can be respectively opened at different height positions in the axial direction of the crankshaft. The long-axis oil holes 12 on the long-axis oil groove 11 and the short-axis oil holes 32 on the short-axis oil groove 31 can also be distributed at intervals along the circumference of the crankshaft, that is, the long-axis oil holes 12 and the short-axis oil holes 32 can be opened at the same height position in the axial direction of the crankshaft. Of course, the long-axis oil holes 12 and the short-axis oil holes 32 can also be opened at different height positions in the axial direction of the crankshaft at the same time, and the long-axis oil holes 12 and the short-axis oil holes 32 can be opened at the same height position in the axial direction of the crankshaft. The spacing angle between adjacent long-axis oil holes 12 and short-axis oil holes 32 spaced apart along the circumference of the crankshaft at the same height position in the axial direction of the crankshaft is not limited. Preferably, the spacing angle between adjacent long-axis oil holes 12 and short-axis oil holes 32 spaced apart along the circumference of the crankshaft is 90°-270°. Figure 2A long-axis oil hole 12 and a short-axis oil hole 32 are opened at the same height position in the axial direction of the crankshaft, with the crankshaft keyway as the marking point, the interval angle between the long-axis oil hole 12 and the crankshaft keyway is θ1, the interval angle between the short-axis oil hole 32 and the crankshaft keyway is θ2, and the interval angle between the long-axis oil hole 12 and the short-axis oil hole 32 is θ1+θ2, 90°≤θ1+θ2≤270°, and optimally, θ1+θ2=180°.

[0046] 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.

[0047] 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 (2) and a short shaft (3) connected in sequence from far to near along the axial direction, characterized in that: The distal end surface of the long shaft (1) is provided with a long shaft oil groove (11) extending in the axial direction and closed at the proximal end, and the proximal end surface of the short shaft (3) is provided with a short shaft oil groove (31) extending in the axial direction and closed at the distal end. The distal end of the short shaft oil groove (31) at least extends into the eccentric portion (2). The long shaft oil groove (11) and the short shaft oil groove (31) are non-coaxially arranged and are not connected to each other. The long shaft oil groove (11) is provided with a long shaft oil hole (12) having one end connected to the long shaft oil groove (11) and the other end penetrating the outer peripheral surface of the crankshaft. At least one of the long shaft oil holes (12) is located at the proximal end of the long shaft oil groove (11).

2. The crankshaft according to claim 1, characterized in that The long-axis oil groove (11) and / or the short-axis oil groove (31) are arranged non-concentrically with the crankshaft.

3. The crankshaft according to claim 1, characterized in that The sum of the axial extension length of the long-shaft oil groove (11) and the axial extension length of the short-shaft oil groove (31) is greater than the axial extension length of the crankshaft.

4. The crankshaft according to claim 1, characterized in that The proximal end of the long shaft oil groove (11) extends into the eccentric portion (2).

5. The crankshaft according to claim 4, characterized in that The proximal end of the long shaft oil groove (11) extends to an end side of the eccentric portion (2) close to the short shaft (3).

6. The crankshaft according to claim 1, characterized in that The distal end of the short shaft oil groove (31) extends into the long shaft (1).

7. The crankshaft according to claim 1, characterized in that The short shaft oil groove (31) is provided with a short shaft oil hole (32) whose one end is connected to the short shaft oil groove (31) and the other end passes through the outer peripheral surface of the crankshaft. At least one of the short shaft oil holes (32) is located in the eccentric part (2). The short shaft oil hole (32) and the long shaft oil hole (12) are not connected to each other.

8. The crankshaft according to claim 7, characterized in that The long-axis oil holes (12) and the short-axis oil holes (32) are distributed at intervals along the axial direction and / or circumferential direction of the crankshaft.

9. The crankshaft according to claim 8, characterized in that The spacing angle between the adjacent long-axis oil holes (12) and short-axis oil holes (32) distributed at intervals along the circumference of the crankshaft is 90°-270°.

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

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