Oil return crankshaft and compressor
By designing the long shaft oil groove and side oil hole structure of the return oil crankshaft, the problem of refrigerant oil accumulation in the rotary compressor was solved, achieving oil return and lubrication effects, and reducing pump body wear.
Patent Information
- Application Number
- CN202520064287.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-10
- Publication Date
- 2025-11-07
- Estimated Expiration
- 2035-01-10
AI Technical Summary
In rotary compressors, refrigerant oil accumulates above the motor, causing the oil level at the bottom of the casing to drop, resulting in uneven oil distribution, which affects pump lubrication and leads to poor wear.
Design an oil return crankshaft including a long shaft section, an eccentric section and a short shaft section. The long shaft section is provided with a long shaft oil groove and a long shaft side oil hole, and the short shaft section is provided with a short shaft oil groove. The radial dimensions of the oil groove and the side oil hole gradually decrease, and the connection design is used to realize oil return and ensure lubrication effect.
This allows for the return of oil from the upper part of the motor, ensuring the lubrication of the crankshaft, reducing pump wear, and maintaining the strength of the crankshaft structure.
Smart Images
Figure CN223524201U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to rotor compressor technical field, concretely relates to a return oil crankshaft and compressor. BACKGROUND
[0002] Rotor compressor is generally composed of upper cover, lower cover, shell and fixed inside crankshaft, motor for providing rotary power and pump body for realizing refrigerant compression, and motor drives crankshaft rotation to realize refrigerant compression. Figure 4 As shown in the figure, central oil hole 400 and bypass through hole 500 are arranged in crankshaft, central oil hole 400 extends upwards along the axis of crankshaft from the bottom end of crankshaft, and the two ends of bypass through hole 500 are communicated with central oil hole 400 and crankshaft surface respectively, so that the refrigeration oil entering from central oil hole 400 can flow to the outer circumferential surface of crankshaft from bypass through hole 500 to realize lubrication.
[0003] When rotor compressor operates, the refrigeration oil pumped from the bottom of shell is difficult to return to the lower part of pump body in the upper space of motor, and the refrigeration oil accumulation in the upper space of motor can cause the oil surface of shell bottom to decrease continuously with time, so that the oil distribution in compressor is unbalanced, the oil pumping amount is reduced and the lubrication of pump body part is affected, and finally the pump body is abraded badly.
[0004] Therefore, how to return the refrigeration oil accumulated in the upper space of motor to the bottom of shell has become a technical problem to be solved by the person skilled in the art. SUMMARY
[0005] Therefore, the utility model provides a return oil crankshaft aiming at the above technical problem.
[0006] The technical scheme adopted by the utility model is as follows: a return oil crankshaft, which comprises a long shaft section, an eccentric section and a short shaft section fixedly connected along the axial direction of the return oil crankshaft.
[0007] A short shaft oil groove hole is formed on the short shaft section, and the short shaft oil groove hole penetrates the eccentric section along the axial direction and extends to the long shaft section.
[0008] A long shaft oil groove hole and a long shaft side oil hole are formed on the long shaft section, the radial dimension of the long shaft oil groove hole gradually decreases along the axial direction thereof, and the long shaft side oil hole is communicated with the bottom of the long shaft oil groove hole.
[0009] Preferably, from the long shaft section to the short shaft section direction, the long shaft oil groove hole comprises n upper groove hole sections connected in sequence along the axial direction thereof, the radial dimension of the upper groove hole section far away from the short shaft section among the two adjacent upper groove hole sections is D 上The radial dimension of the upper groove hole section close to the short shaft section is D 下 , D 下 ≤0.9×D 上 , n is a positive integer greater than or equal to 2.
[0010] Preferably, the long shaft oil groove hole and the short shaft oil groove hole are coaxially arranged.
[0011] Preferably, the long shaft oil groove hole and the short shaft oil groove hole are communicated.
[0012] Preferably, 3≤n.
[0013] Preferably, the axial length of the long shaft section is H, the axial length of the upper groove hole section at the end of the long shaft section away from the short shaft section is L1, and L1≤0.6×H.
[0014] Preferably, the axis of the long shaft oil groove hole and the axis of the short shaft oil groove hole are arranged at a distance.
[0015] Preferably, the long shaft oil groove hole and the short shaft oil groove hole are arranged at a distance in the axial direction of the oil return crankshaft.
[0016] Preferably, 2≤n.
[0017] Preferably, the long shaft section is formed with a short shaft side hole, and the short shaft side hole is communicated with the top end of the short shaft oil groove hole.
[0018] Preferably, from the short shaft section to the long shaft section, the short shaft oil groove hole includes m lower groove hole sections connected in sequence along the axial direction thereof, the radial dimension of the lower groove hole section away from the long shaft section is d 下 , the radial dimension of the lower groove hole section close to the long shaft section is d 上 , d 上 ≤0.9×d 下 , and m is a positive integer greater than or equal to 2.
[0019] Preferably, two adjacent upper groove hole sections are connected through a step, an arc section or a truncated cone section, and two adjacent lower groove hole sections are connected through a step, an arc section or a truncated cone section.
[0020] The second purpose of the utility model is to provide a compressor comprising the oil return crankshaft.
[0021] The utility model has the advantages of:
[0022] The utility model discloses a long shaft oil groove hole and long shaft side oil hole are formed on the long shaft section of crankshaft, from the long shaft section to the short shaft section direction, the radial dimension of this long shaft oil groove hole gradually reduces along its axial direction, one end of long shaft side oil hole communicates with the bottom end of long shaft oil groove hole, and the other end of long shaft side oil hole communicates with the outer surface of crankshaft, so that the oil gathered in the upper space of motor can return to the outer surface of crankshaft through long shaft oil groove hole and long shaft side oil hole and lubricate, in addition, the frozen oil accumulated in the upper space of motor can return to the bottom of shell and participate in the lubrication of each part of pump body again, guarantee the structure strength of crankshaft, and reduce the wear of pump body. BRIEF DESCRIPTION OF DRAWINGS
[0023] Figure 1 It is one of structure schematic diagram of the oil return crankshaft of the utility model;
[0024] Figure 2 It is size diagram of the oil return crankshaft of the utility model;
[0025] Figure 3 It is the second structure schematic diagram of the oil return crankshaft of the utility model;
[0026] Figure 4 It is the structure schematic diagram of prior crankshaft.
[0027] Mark explanation in drawing:
[0028] 100, long shaft section;
[0029] 110, long shaft oil groove hole; 111, first upper groove hole section; 112, second upper groove hole section; 113, third upper groove hole section; 120, long shaft side oil hole;
[0030] 200, eccentric section;
[0031] 300, short shaft section;
[0032] 310, short shaft oil groove hole; 311, first lower groove hole section; 312, second lower groove hole section; 320, short shaft side hole;
[0033] 400, center oil hole;
[0034] 500, bypass through hole. DETAILED DESCRIPTION
[0035] The specific embodiments of the utility model are further explained in detail in combination with the drawings. These embodiments are only used for explaining the utility model, and are not the limitation of the utility model.
[0036] In the description of the utility model, it is necessary to explain that, the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "internal", "external" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the utility model and simplifying the description, and do not indicate or imply that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the utility model. In addition, the terms "first", "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance.
[0037] In the description of the utility model, it should be pointed out that, unless otherwise specified and limited, the terms "mounting", "connection", "connection" should be understood broadly, for example, it can be fixedly connected, and can also be detachably connected, or integrally connected, can be mechanically connected, or electrically connected, can be directly connected, or indirectly connected through an intermediate medium, can be the communication inside two elements. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.
[0038] In addition, in the description of the utility model, unless otherwise stated, the meaning of "a plurality of" is two or more than two.
[0039] Embodiments, such as Figure 1 、 Figure 2 and Figure 3 An oil return crankshaft, comprising a long shaft section 100, an eccentric section 200 and a short shaft section 300 fixedly connected in the axial direction.
[0040] A short shaft oil groove hole 310 is formed on the short shaft section 300, which penetrates the eccentric section 200 along the axial direction and extends to the long shaft section 100.
[0041] A long shaft oil groove hole 110 and a long shaft side oil hole 120 are formed on the long shaft section 100, the radial dimension of the long shaft oil groove hole 110 gradually decreases along the axial direction to one end of the short shaft section 300, and the long shaft side oil hole 120 communicates with the bottom of the long shaft oil groove hole 110.
[0042] The utility model discloses a long shaft oil groove hole 110 and long shaft side oil hole 120 are formed on the long shaft section 100 of crankshaft, from long shaft section 100 to short shaft section 300 direction, the radial dimension of this long shaft oil groove hole 110 gradually reduces along its axial direction, one end of long shaft side oil hole 120 and the bottom end of long shaft oil groove hole 110 communicate, the other end of long shaft side oil hole 120 and the outer surface of crankshaft communicate, make the oil liquid gathered in the upper space of motor can flow back to the outer surface of crankshaft through long shaft oil groove hole 110 and long shaft side oil hole 120 and lubricate it, in addition still can make the frozen oil accumulated in the upper space of motor flow back to the bottom of shell and participate in the lubrication of each component of pump body again, guarantee the structure strength of crankshaft while, reduced the wear of pump body.
[0043] Specific embodiment 1, as shown in Figure 1 and Figure 2 An oil return crankshaft, comprising long shaft section 100, eccentric section 200 and short shaft section 300 fixedly connected in sequence along its axial direction.
[0044] Formed with short shaft oil groove hole 310 on short shaft section 300, the short shaft oil groove hole 310 extends upwards along its axial direction, and the top end of short shaft oil groove hole 310 extends to long shaft section 100 after penetrating eccentric section 200.
[0045] Formed with long shaft oil groove hole 110 and long shaft side oil hole 120 on long shaft section 100, the long shaft oil groove hole 110 extends downwards along its axial direction, and the bottom end of long shaft oil groove hole 110 and the top end of short shaft oil groove hole 310 communicate.
[0046] The radial dimension of long shaft oil groove hole 110 gradually reduces along its axial direction, that is, the radial dimension of long shaft oil groove hole 110 gradually reduces from top to bottom, and long shaft side oil hole 120 and the bottom of long shaft oil groove hole 110 communicate, so that the oil in long shaft oil groove hole 110 flows to the outer surface of crankshaft through long shaft side oil hole 120 to lubricate the crankshaft, and in addition, the frozen oil accumulated in the upper space of the motor can flow back to the bottom of the shell to participate in the lubrication of each component of the pump body again.
[0047] Preferably, short shaft side hole 320 is also formed on long shaft section 100, short shaft side hole 320 is located below long shaft side oil hole 120, and short shaft side hole 320 and the top end of short shaft oil groove hole 310 communicate, so that the oil in short shaft oil groove hole 310 can flow smoothly to the outer surface of the crankshaft for lubrication.
[0048] The long shaft oil groove hole 110 includes n upper groove hole sections connected in sequence along its axial direction, in the two adjacent upper groove hole sections, the radial dimension of the upper groove hole section located above is D 上 , the radial dimension of the upper groove hole section located below is D 下 , and D 下 ≤0.9×D上 n is a positive integer greater than or equal to 2.
[0049] Specifically, as shown in Figure 1 , the short shaft oil groove hole 310 is formed on the short shaft section 300, the top end of the short shaft oil groove hole 310 extends upward along the axial direction to the long shaft section 100; the long shaft oil groove hole 110 and the long shaft side oil hole 120 are formed on the long shaft section 100, the long shaft oil groove hole 110 extends downward along the axial direction, the long shaft oil groove hole 110 is coaxial with the short shaft oil groove hole 310, that is, the axis of the long shaft oil groove hole 110 coincides with the axis of the short shaft oil groove hole 310, and the bottom end of the long shaft oil groove hole 110 communicates with the top end of the short shaft oil groove hole 310.
[0050] The long shaft oil groove hole 110 includes a plurality of upper groove hole sections fixedly connected along the axial direction, and the number of upper groove hole sections is at least three.
[0051] For example, as shown in Figure 2 , the long shaft oil groove hole 110 includes a first upper groove hole section 111, a second upper groove hole section 112 and a third upper groove hole section 113 fixedly connected along the axial direction, the first upper groove hole section 111, the second upper groove hole section 112 and the third upper groove hole section 113 are connected in order from top to bottom, the bottom end of the first upper groove hole section 111 is fixedly connected with the top end of the second upper groove hole section 112 through a circular arc section, and the bottom end of the second upper groove hole section 112 and the top end of the third upper groove hole section 113 are fixedly connected through a circular truncated cone section.
[0052] The axial dimension of the first upper groove hole section 111 is L1, the axial length of the long shaft section 100 is H, that is, the distance from the upper end face of the long shaft section 100 to the upper eccentricity of the eccentric section 200 is H, and L1≤0.6×H, so as to ensure the overall structural strength of the crankshaft.
[0053] The radial dimension of the first upper groove hole section 111 is D1, the radial dimension of the second upper groove hole section 112 is D2, D2≤0.9×D1; the radial dimension of the third upper groove hole section 113 is D3, D3≤0.9×D2, in this way, the plurality of upper groove hole sections are reduced in radial dimension to ensure the rigidity of the crankshaft, so that the crankshaft is not easy to deform.
[0054] Preferably, as shown in Figure 1 , the short shaft oil groove hole 310 includes m lower groove hole sections connected in order along the axial direction, in the two adjacent lower groove hole sections, the radial dimension of the lower groove hole section located below is d 下 , the radial dimension of the lower groove hole section located above is d 上 , d 上 ≤0.9×d 下 , and m is a positive integer greater than or equal to 2.
[0055] For example, as shown in Figure 1 and 2 The short shaft oil groove hole 310 includes a first lower groove hole segment 311 and a second lower groove hole segment 312 fixedly connected along the axial direction thereof, the first lower groove hole segment 311 is fixedly connected below the second lower groove hole segment 312, and the top end of the first lower groove hole segment 311 is fixedly connected with the bottom end of the second lower groove hole segment 312 through a circular arc segment.
[0056] The radial dimension of the first lower groove hole segment 311 is d1, and the radial dimension of the second lower groove hole segment 312 is d2, d2≤0.9×d1, so as to ensure the structural strength of the crankshaft as a whole.
[0057] Specifically, as shown in Figure 3 An oil return crankshaft, comprising a long shaft segment 100, an eccentric segment 200 and a short shaft segment 300 fixedly connected in sequence along the axial direction thereof.
[0058] A short shaft oil groove hole 310 is formed on the short shaft segment 300, the short shaft oil groove hole 310 extends upward along the axial direction thereof, and the top end of the short shaft oil groove hole 310 extends to the long shaft segment 100 after penetrating through the eccentric segment 200, a short shaft side hole 320 is formed on the long shaft segment 100, and the short shaft side hole 320 communicates with the top end of the short shaft oil groove hole 310.
[0059] A long shaft oil groove hole 110 and a long shaft side oil hole 120 are formed on the long shaft segment 100, the long shaft oil groove hole 110 extends downward along the axial direction thereof, and the long shaft oil groove hole 110 and the short shaft oil groove hole 310 are arranged at intervals in the axial direction of the crankshaft, that is, the bottom end of the long shaft oil groove hole 110 does not communicate with the top end of the short shaft oil groove hole 310.
[0060] From the long shaft segment 100 to the short shaft segment 300, the radial dimension of the long shaft oil groove hole 110 gradually decreases along the axial direction thereof, that is, the radial dimension of the long shaft oil groove hole 110 gradually decreases from top to bottom, the long shaft side oil hole 120 is arranged along the radial direction of the crankshaft, one end of the long shaft side oil hole 120 communicates with the bottom of the long shaft oil groove hole 110, and the other end of the long shaft side oil hole 120 communicates with the outer surface of the crankshaft, so that the oil in the long shaft oil groove hole 110 can flow to the outer surface of the crankshaft through the long shaft side oil hole 120; in this way, the crankshaft can be lubricated, and at the same time, the refrigeration oil accumulated in the upper space of the motor can be returned to the bottom of the housing to participate in the lubrication of the various parts of the pump body again.
[0061] Preferably, the long shaft oil groove hole 110 includes n upper groove hole segments connected in sequence along the axial direction thereof, in the two adjacent upper groove hole segments, the radial dimension of the upper groove hole segment located above is D 上 , the radial dimension of the upper groove hole segment located below is D 下 , and D 下 ≤0.9×D上 n is a positive integer greater than or equal to 2.
[0062] Specifically, such as Figure 3 As shown, a short shaft oil groove hole 310 is formed on the short shaft section 300. The top end of the short shaft oil groove hole 310 extends upward along its axial direction to the long shaft section 100. A short shaft side hole 320 is formed on the long shaft section 100. The short shaft side hole 320 is arranged along the radial direction of the crankshaft, and one end of the short shaft side hole 320 is connected to the top end of the short shaft oil groove hole 310, while the other end of the short shaft side hole 320 is connected to the crankshaft surface. A long shaft oil groove hole 110 and a long shaft side oil hole 120 are formed on the long shaft section 100. The long shaft oil groove hole 110 extends downward along its axial direction. The axis of the long shaft oil groove hole 110 and the axis of the short shaft oil groove hole 310 can be spaced apart, that is, the axis of the long shaft oil groove hole 110 and the short shaft oil groove hole 310 can be non-axial, and the bottom end of the long shaft oil groove hole 110 is not connected to the top end of the short shaft oil groove hole 310.
[0063] The long shaft oil groove hole 110 includes multiple upper groove hole segments fixedly connected along its axial direction, and the number of upper groove hole segments is at least two.
[0064] For example, the long shaft oil groove hole 110 includes a first upper groove hole section 111 and a second upper groove hole section 112 fixedly connected along its axial direction. The first upper groove hole section 111 is fixedly connected above the second upper groove hole section 112, and the bottom end of the first upper groove hole section 111 and the top end of the second upper groove hole section 112 are fixedly connected by a step.
[0065] The axial dimension of the first upper slot section 111 is L1, and the axial length of the long shaft section 100 is H, which is the distance from the upper end face of the long shaft section 100 to the upper eccentricity of the eccentric section 200 is H, and L1≤0.6×H, so as to ensure the overall structural strength of the crankshaft.
[0066] The radial dimension of the first upper slotted section 111 is D1, and the radial dimension of the second upper slotted section 112 is D2, where D2 ≤ 0.9 × D1. In this way, the multiple upper slotted sections reduce their radial dimensions to ensure the rigidity of the crankshaft and prevent it from deforming.
[0067] More preferably, the short shaft oil groove hole 310 includes m lower groove hole segments connected sequentially along its axial direction, and the radial dimension of the lower groove hole segment located at the bottom is d. 下 The radial dimension of the upper lower slot section is d. 上 d 上 ≤0.9×d 下 m is a positive integer greater than or equal to 2.
[0068] For example, the short shaft oil groove hole 310 comprises a first lower groove hole section 311 and a second lower groove hole section 312 fixedly connected along the axial direction, the first lower groove hole section 311 is fixedly connected below the second lower groove hole section 312, and the top end of the first lower groove hole section 311 and the bottom end of the second lower groove hole section 312 are fixedly connected through a circular truncated cone section.
[0069] The radial dimension of the first lower groove hole section 311 is d1, and the radial dimension of the second lower groove hole section 312 is d2, d2≤0.9×d1, so that the structural strength of the crankshaft as a whole can be ensured.
[0070] Embodiment, a compressor comprising the oil return crankshaft described above.
[0071] The working process of the oil return crankshaft of the utility model is as follows:
[0072] In use, in order to make the oil liquid gathered in the upper space of the motor flow into the long shaft oil groove hole, it is necessary to install a rotating blade (prior art) on the top of the long shaft oil groove hole as in the short shaft oil groove hole, that is, to install a rotating blade in the first upper groove section of the long shaft oil groove hole, the depth of the rotating blade inserted into the long shaft oil groove hole is not greater than the length of the first upper groove section, so as to pump the oil liquid in the upper space of the motor to the lower space of the motor.
[0073] Compared with the prior art, the utility model has at least the following beneficial technical effects:
[0074] The oil return crankshaft of the utility model not only can improve the oil return of the compressor, but also can reduce the influence of the opening on the strength of the crankshaft.
[0075] The above description is only the preferred embodiment of the utility model, and it should be pointed out that, for ordinary skilled persons in the technical field, several improvements and replacements can be made without departing from the technical principle of the utility model, and these improvements and replacements should also be regarded as the protection range of the utility model.
Claims
1. An oil return crankshaft characterized by, The oil return crankshaft comprises a long shaft section (100), an eccentric section (200) and a short shaft section (300) fixedly connected along the axial direction of the oil return crankshaft; The short shaft oil groove hole (310) is formed on the short shaft section (300), penetrates the eccentric section (200) along the axial direction and extends to the long shaft section (100); The long shaft oil groove hole (110) and the long shaft side oil hole (120) are formed on the long shaft section (100), the radial dimension of the long shaft oil groove hole (110) gradually decreases along the axial direction, and the long shaft side oil hole (120) communicates with the bottom of the long shaft oil groove hole (110).
2. A return oil crankshaft according to claim 1, characterized in that From the long axis section (100) to the short axis section (300), the long axis oil groove hole (110) comprises n upper groove hole sections connected in sequence along the axial direction, in the two adjacent upper groove hole sections, the radial dimension of the upper groove hole section away from the short axis section (300) is D 上 , the radial dimension of the upper groove hole section close to the short axis section (300) is D 下 , D 下 ≤0.9×D 上 , n is a positive integer greater than or equal to 2.
3. A return oil crankshaft according to claim 2, wherein The long shaft oil groove hole (110) and the short shaft oil groove hole (310) are coaxially arranged.
4. A return oil crankshaft according to claim 3, wherein The long shaft oil groove hole (110) and the short shaft oil groove hole (310) communicate.
5. A return oil crankshaft according to claim 4, wherein 3≤n。 6. The oil-return crankshaft of claim 2, wherein The axial length of the long shaft section (100) is H, the axial length of the upper groove hole section at the end of the long shaft section (100) away from the short shaft section (300) is L1, and L1≤0.6×H.
7. The oil-return crankshaft of claim 2, wherein The axial line of the long shaft oil groove hole (110) and the axial line of the short shaft oil groove hole (310) are arranged at a distance.
8. A return oil crankshaft according to claim 7, characterized in that The long shaft oil groove hole (110) and the short shaft oil groove hole (310) are arranged at a distance along the axial direction of the oil return crankshaft.
9. A return oil crankshaft according to claim 8, wherein 2≤n。 10. The oil-return crankshaft of claim 7, wherein The long shaft section (100) is formed with a short shaft side hole (320), and the short shaft side hole (320) communicates with the top end of the short shaft oil groove hole (310).
11. The oil-return crankshaft of claim 2, wherein From the short shaft section (300) to the long shaft section (100), the short shaft oil groove hole (310) comprises m lower groove hole sections connected in sequence along the axial direction thereof, the radial dimension of the lower groove hole section away from the long shaft section (100) is d 下 , the radial dimension of the lower groove hole section close to the long shaft section (100) is d 上 , d 上 ≤0.9×d 下 , and m is a positive integer greater than or equal to 2.
12. A return oil crankshaft according to claim 11, characterized in that Adjacent two upper groove hole sections are connected through a step, an arc section or a circular truncated cone section, and adjacent two lower groove hole sections are connected through a step, an arc section or a circular truncated cone section.
13. A compressor characterized by: The oil return crankshaft comprises a long shaft section (100), an eccentric section (200) and a short shaft section (300) fixedly connected along the axial direction of the oil return crankshaft;