CN111043145A

CN111043145A - Crankshaft for compressor

Info

Publication number: CN111043145A
Application number: CN201911373501.3A
Authority: CN
Inventors: 朱国雄
Original assignee: Huangshi Zhengda Industry & Trade Co ltd
Current assignee: Huangshi Zhengda Industry & Trade Co ltd
Priority date: 2019-12-26
Filing date: 2019-12-26
Publication date: 2020-04-21
Anticipated expiration: 2039-12-26
Also published as: CN111043145B

Abstract

The invention discloses a crankshaft for a compressor, which belongs to the technical field of crankshafts and comprises a crankshaft, wherein the crankshaft comprises a short shaft, an eccentric part and a long shaft, the top of the eccentric part is fixedly connected with the short shaft, the bottom of the eccentric part is fixedly connected with the long shaft, the long shaft is formed by hinging a twisted strip A and a twisted strip B, the twisted long shaft has high structural strength and can bear large torsional stress, the long shaft is not easy to be bent, twisted and deformed or twisted off when the surface of the long shaft rotates at high speed for a long time, triangular saw teeth are fixedly connected on the outer side walls of the short shaft and the eccentric part, inverted triangular oil grooves B are formed between the triangular saw teeth, an integrated oil groove is formed on the surface of the long shaft, the triangular structural strength is high, the crankshaft structural strength is prevented from being influenced by arranging the oil groove on the surface of, the inside and steel wire connection of bent axle further increases bent axle structural strength.

Description

Crankshaft for compressor

Technical Field

The invention relates to the technical field of crankshafts, in particular to a crankshaft for a compressor.

Background

The crankshaft of the rotary compressor rotates at high speed under the support of the upper flange and the lower flange, so that the compressor compresses gas to work, although a certain amount of refrigeration oil is arranged between the crankshaft and the upper flange and between the crankshaft and the lower flange for lubrication, the balance block also balances the inertia of a rotor assembly and the like, but the inertia of the rotor component is larger, the balance weight can not realize ideal balance, the crankshaft and the flange are tightly attached, the lubrication is not ideal enough, the conventional crankshaft and the upper flange are lubricated mainly through a spiral oil groove of the upper flange, the distribution of the lubricating oil is average distribution, the stress is not differentiated, therefore, the eccentric wear of the crankshaft, the eccentric wear of the upper flange or the eccentric wear of the lower flange often occurs in the conventional products, the long-term wear finally causes the failure and damage of the compressor, particularly, for a variable frequency compressor with high rotating speed, a T3 working condition compressor under a severe working condition and a heat pump water heater compressor, the quality problem of the compressor caused by eccentric wear is more.

Patent number CN 104912910B discloses a bent axle and compressor, add the oil groove through the week side surface of major axis and/or minor axis on the bent axle, and set up the oil groove in the relative one side of eccentric portion's eccentric volume direction, make there is thicker oil film on the contact surface of bent axle and last flange and lower flange, thereby improved the phenomenon of bent axle eccentric wear, go up flange eccentric wear and lower flange eccentric wear, improved the reliability and the performance of compressor, prolonged the life of compressor.

The crankshaft for a compressor disclosed in the above patent has the following disadvantages: 1. the crankshaft for the compressor disclosed in the patent is a rod with a circular cross section, the crankshaft is driven to rotate at a high speed by the upper flange and the lower flange when the compressor works, torsional stress is easily generated when the crankshaft rotates at a high speed, the torsional stress on the cylindrical cross section is linearly increased from the center to the outer surface along the shaft with the circular cross section, and the crankshaft is easily bent, twisted and deformed or broken under the action of the torsional stress; 2. in order to achieve the purpose of evenly distributing lubricating oil and enhancing the lubricating effect of the crankshaft for the compressor, rectangular oil grooves are formed in the peripheral side surfaces of the short shaft, the eccentric part and the long shaft of the crankshaft, so that the integrity of the crankshaft is damaged, the structural strength of the crankshaft is reduced, and the crankshaft is easy to break; to this end, we propose a crankshaft for a compressor.

Disclosure of Invention

The invention provides a crankshaft for a compressor, wherein a long shaft is formed by hinging a twisting strip A and a twisting strip B, the twisted long shaft has higher structural strength and can bear larger torsional stress, the long shaft is not easy to be bent, twisted or broken when the surface of the long shaft rotates at high speed for a long time, the long shaft is prevented from being bent, twisted or broken due to the long shaft rotating at high speed for a long time, triangular saw teeth are fixedly connected to the outer side walls of a short shaft and an eccentric part, an inverted triangular oil groove B is formed between the triangular saw teeth, meanwhile, an integrated oil groove is formed on the surface of the long shaft, the triangular structural strength is higher, the crankshaft is prevented from being broken due to the fact that the oil groove is formed on the surface of the crankshaft, the inner part.

The specific technical scheme provided by the invention is as follows:

the invention provides a crankshaft for a compressor, which comprises a crankshaft, wherein the crankshaft comprises a short shaft, an eccentric part and a long shaft, the top of the eccentric part is fixedly connected with the short shaft, the bottom of the eccentric part is fixedly connected with the long shaft, the long shaft comprises a twisted strip A and a twisted strip B, the twisted strip A is hinged with the twisted strip B, an oil groove A is formed between the twisted strip A and the twisted strip B, triangular saw teeth are fixedly connected with the outer side walls of the short shaft and the eccentric part, an oil groove B is formed between the triangular saw teeth, and the inner centers of the short shaft, the eccentric part, the twisted strip A and the twisted strip B are connected with steel wires.

Optionally, the short shaft is located inside a shaft hole of the upper flange, the eccentric portion is located inside a mounting hole of the compressor body, the long shaft is located inside a shaft hole of the lower flange, and the crankshaft is detachably connected with the compressor body through the upper flange and the lower flange.

Optionally, the upper flange, the lower flange and the compressor body are all provided with screw holes, and the upper flange and the lower flange are detachably connected with the compressor body through the screw holes, bolts and nuts.

Optionally, the depth of the oil groove B is 0.2-0.5 mm, the maximum width of the oil groove B is 2-3 mm, and the cross section of the oil groove B is triangular.

Optionally, the surface of the crankshaft is subjected to nodular cast iron crankshaft fillet rolling strengthening treatment.

The invention has the following beneficial effects:

the embodiment of the invention provides a crankshaft for a compressor, which comprises:

1. the long shaft is formed by hinging the twisting strips A and B, the twisted long shaft has higher structural strength and can bear larger torsional stress, the long shaft is not easy to be bent, twisted and deformed or broken when the surface of the long shaft rotates at high speed for a long time, and the long shaft is prevented from being bent, twisted and broken due to the long-time high-speed rotation.

2. Minor axis and the equal fixedly connected with triangle sawtooth of eccentric part lateral wall, constitute inverted triangle's oil groove B between the triangle sawtooth, the oil groove of major axis surface formation integral type simultaneously, triangle-shaped structural strength is higher, prevent to influence crankshaft structural strength because of seting up the oil groove on the bent axle surface, cause the bent axle fracture, the bent axle is inside to be connected with the steel wire, further increase crankshaft structural strength, solve the minor axis of the bent axle for the compressor that publishes in the above-mentioned patent, rectangle oil groove has all been seted up to eccentric part and major axis week side surface, destroy the integrity of bent axle, reduce the structural strength of bent axle, the easy cracked problem of bent.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

Fig. 1 is a schematic view of an overall structure of a crankshaft for a compressor according to an embodiment of the present invention;

fig. 2 is a plan view of a crankshaft for a compressor according to an embodiment of the present invention.

In the figure: 1. a compressor body; 2. a screw hole; 3. a bolt; 4. a lower flange; 5. a nut; 6. an upper flange; 7. a crankshaft; 701. a minor axis; 702. an eccentric portion; 703. a long axis; 7031. twisting the strip A; 7032. twisting the strip B; 8. mounting holes; 9. an oil groove A; 10. a steel wire; 11. triangular saw teeth; 12. and an oil groove B.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention clearer, the present invention will be described in further detail with reference to the accompanying drawings, and it is apparent that the described embodiments are only a part of the embodiments of the present invention, not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

A crankshaft for a compressor according to an embodiment of the present invention will be described in detail with reference to fig. 1 to 2.

Referring to fig. 1 and 2, a crankshaft for a compressor according to an embodiment of the present invention includes a crankshaft 7, where the crankshaft 7 includes a short shaft 701, an eccentric portion 702, and a long shaft 703, the top of the eccentric portion 702 is fixedly connected with the short shaft 701, the bottom of the eccentric portion 702 is fixedly connected with the long shaft 703, the long shaft 703 includes a twisted strip a7031 and a twisted strip B7032, the twisted strip a7031 is hinged to the twisted strip B7032, an oil groove a9 is formed between the twisted strip a7031 and the twisted strip B7032, triangular saw teeth 11 are fixedly connected to outer sidewalls of the short shaft 701 and the eccentric portion 702, an oil groove B12 is formed between the triangular saw teeth 11, and inner centers of the short shaft 701, the eccentric portion 702, the twisted strip a7031, and the twisted strip B7032 are connected to a steel wire 10.

Illustratively, the long shaft 703 is formed by hinging a twisted strip a7031 and a twisted strip B7032, the twisted long shaft 703 has high structural strength and can bear large torsional stress, the long shaft 703 is not easily bent, twisted or broken when the surface of the long shaft 703 rotates at high speed for a long time, the long shaft 703 is prevented from being bent, twisted or broken due to the long-time high-speed rotation of the long shaft 703, triangular saw teeth 11 are fixedly connected to the outer side walls of the short shaft 701 and the eccentric part 702, inverted triangular oil grooves B12 are formed between the triangular saw teeth 11, an integrated oil groove a9 is formed on the surface of the long shaft 703, the triangular structural strength is high, the structural strength of the crankshaft 7 is prevented from being influenced due to the oil grooves formed on the surface of the crankshaft 7, the crankshaft 7 is broken, the inside of the crankshaft.

Referring to fig. 1, the short shaft 701 is located inside the shaft hole of the upper flange 6, the eccentric portion 702 is located inside the mounting hole 8 of the compressor body 1, the long shaft 703 is located inside the shaft hole of the lower flange 4, and the crankshaft 7 is detachably connected to the compressor body 1 through the upper flange 6 and the lower flange 4.

Illustratively, the crankshaft 7 is detachably connected with the compressor body 1 through the upper flange 6 and the lower flange 4, and the installation is more stable.

Referring to fig. 1, the upper flange 6, the lower flange 4 and the compressor body 1 are all provided with screw holes 2, and the upper flange 6 and the lower flange 4 are detachably connected with the compressor body 1 through the screw holes 2, bolts 3 and nuts 5.

In the example, the upper flange 6 and the lower flange 4 are detachably connected with the compressor body 1 through the screw holes 2, the bolts 3 and the nuts 5, and the bolt connection mode is stable and convenient to install and detach.

Referring to fig. 1 and 2, the oil groove B12 has a depth of 0.2-0.5 mm and a maximum width of 2-3 mm, and the cross section of the oil groove B12 is triangular.

For example, the cross section of the oil groove B12 is triangular, and the triangular structure is high in strength and not easy to damage.

Referring to fig. 1, the surface of the crankshaft 7 is subjected to nodular cast iron crankshaft fillet rolling strengthening treatment.

In an example, the surface of the crankshaft 7 is subjected to nodular cast iron crankshaft fillet rolling strengthening treatment, so that the structural strength of the surface of the crankshaft is improved.

When the crankshaft lubricating device is used, the short shaft 701 of the crankshaft 7 is clamped in the shaft hole of the upper flange 6, the eccentric part 702 is clamped in the mounting hole 8 of the compressor body 1, the long shaft 703 is clamped in the shaft hole of the lower flange 4, the upper flange 6 and the lower flange 4 are connected with the compressor body 1 through the screw hole 2, the bolt 3 and the nut 5, the crankshaft 7 is driven to run at high speed by the upper flange 6 and the lower flange 4 when the compressor body 1 works, lubricating oil flows to the inverted triangle oil groove B12 on the surface of the eccentric part 702 through the inverted triangle oil groove B12 on the surface of the short shaft 701 and then flows to the oil groove A9 on the surface of the long shaft 7 to achieve a lubricating effect, the triangle structural strength is high, the crankshaft 7 is prevented from being broken due to the fact that the oil groove is formed on the surface of the crankshaft 7, the inner part of the crankshaft 7 is connected with the steel wire 10, the structural strength of the crankshaft 7 is further increased, the twisted long shaft 703 has high structural strength and can bear large torsional stress, and the long shaft 703 is not easily deformed by bending or breaking when the surface of the long shaft 703 rotates at high speed for a long time to generate torsional stress.

The invention relates to a crankshaft for a compressor, which comprises a crankshaft 1 and a compressor body; 2. a screw hole; 3. a bolt; 4. a lower flange; 5. a nut; 6. an upper flange; 7. a crankshaft; 701. a minor axis; 702. an eccentric portion; 703. a long axis; 7031. twisting the strip A; 7032. twisting the strip B; 8. mounting holes; 9. an oil groove A; 10. a steel wire; 11. triangular saw teeth; 12. the oil sump B, components are all standard or known to those skilled in the art, and the structure and principle thereof are known to those skilled in the art through technical manuals or through routine experimentation.

It will be apparent to those skilled in the art that various modifications and variations can be made in the embodiments of the present invention without departing from the spirit or scope of the embodiments of the invention. Thus, if such modifications and variations of the embodiments of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to encompass such modifications and variations.

Claims

1. A crankshaft for a compressor, comprising a crankshaft (7), characterized in that the crankshaft (7) comprises a short shaft (701), an eccentric portion (702) and a long shaft (703), the top of the eccentric part (702) is fixedly connected with a short shaft (701), the bottom of the eccentric part (702) is fixedly connected with a long shaft (703), the major axis (703) comprises a twisted strand A (7031) and a twisted strand B (7032), the twisted strip A (7031) is hinged with the twisted strip B (7032), an oil groove A (9) is formed between the twisted strip A (7031) and the twisted strip B (7032), the outer side walls of the short shaft (701) and the eccentric part (702) are fixedly connected with triangular saw teeth (11), an oil groove B (12) is formed between the triangular saw teeth (11), and the inner centers of the short shaft (701), the eccentric part (702), the twisted strip A (7031) and the twisted strip B (7032) are connected with the steel wire (10).

2. A crankshaft for a compressor according to claim 1, wherein the short shaft (701) is located inside a shaft hole of the upper flange (6), the eccentric portion (702) is located inside a mounting hole (8) of the compressor body (1), the long shaft (703) is located inside a shaft hole of the lower flange (4), and the crankshaft (7) is detachably connected with the compressor body (1) through the upper flange (6) and the lower flange (4).

3. The crankshaft for the compressor as claimed in claim 2, wherein the upper flange (6), the lower flange (4) and the compressor body (1) are provided with screw holes (2), and the upper flange (6) and the lower flange (4) are detachably connected with the compressor body (1) through the screw holes (2), bolts (3) and nuts (5).

4. The crankshaft for the compressor as claimed in claim 1, wherein the oil groove B (12) has a depth of 0.2 to 0.5mm and a maximum width of 2 to 3mm, and the cross section of the oil groove B (12) is triangular.

5. A crankshaft for a compressor according to claim 1, wherein the surface of the crankshaft (7) is subjected to a nodular cast iron crankshaft fillet rolling strengthening treatment.