CN114183325B

CN114183325B - Compressor crankshaft reaches inverter compressor including it

Info

Publication number: CN114183325B
Application number: CN202111467056.4A
Authority: CN
Inventors: 徐睦; 徐敏; 严耀宗; 申婷; 李亚荣; 朱咏杰
Original assignee: Gree Electric Appliances Inc of Zhuhai
Current assignee: Gree Electric Appliances Inc of Zhuhai
Priority date: 2021-12-03
Filing date: 2021-12-03
Publication date: 2023-03-31
Anticipated expiration: 2041-12-03
Also published as: CN114183325A

Abstract

The invention provides a compressor crankshaft and a variable frequency compressor comprising the same. Compressor crankshaft includes the main shaft, is formed with multistage oil circuit on the main shaft, and multistage oil circuit includes: a first oil passage including a first oil groove and a first oil suction hole communicating with the first oil groove; the second oil path comprises a second oil groove and a second oil suction hole communicated with the second oil groove; the main shaft is formed with a main supporting portion and an auxiliary supporting portion, a first oil groove is formed on an outer peripheral wall of the main supporting portion, a second oil groove is formed on a side peripheral wall of the auxiliary supporting portion, a first end of the main shaft constitutes an oil suction end, and a first oil suction hole and a second oil suction hole extend toward the inside of the main shaft at the oil suction end of the main shaft. The multi-stage oil way is arranged on the main shaft of the compressor crankshaft, so that oil can be supplied to different parts of the main shaft, and the main shaft can be supported at the oil supply part. The multi-stage oil way can ensure effective lubrication of the main shaft, avoid the rotation of the main shaft to cause overlarge mechanical wear and reduce the noise generated during operation.

Description

Compressor crankshaft reaches inverter compressor including it

Technical Field

The invention relates to the field of compressors, in particular to a compressor crankshaft and a variable frequency compressor comprising the same.

Background

The compressor is a driven fluid machine that raises low-pressure gas to high-pressure gas, and is the heart of a refrigeration system. Among them, the piston compressor is mainly used in refrigeration of a refrigerator, and in recent years, the efficiency, noise and service life of the piston compressor are important objects in design and research.

The mechanical motion friction loss of parts in the running process of the compressor is an important part influencing the efficiency and the service life of the compressor, the mechanical loss cannot be avoided, and the loss can be reduced by means of lubrication, stress reduction and the like. Taking the bearing support loss of the piston compressor as an example, the bearing stress can be reduced and the loss can be reduced by lengthening the length of the bearing, but the longer the bearing hole of the cylinder block is, the greater the processing difficulty is, the processing quality and the part quality are not necessarily guaranteed, the lengthened length is limited, and meanwhile, the longer the bearing support can improve the gravity center of the pump body, so that the problems of overlarge low-frequency vibration and high noise can be caused.

Disclosure of Invention

In view of this, the present invention provides a compressor crankshaft and a compressor including the same, which at least solve the technical problem of large stress wear of the crankshaft in the prior art, and specifically:

in a first aspect, the present invention provides a compressor crankshaft, including a main shaft, where a multi-stage oil path is formed on the main shaft, and the multi-stage oil path includes:

a first oil passage including a first oil groove and a first oil suction hole communicating with the first oil groove;

the second oil path comprises a second oil groove and a second oil suction hole communicated with the second oil groove;

the main shaft is formed with a main supporting part and an auxiliary supporting part, the first oil groove is formed on an outer circumferential wall of the main supporting part, the second oil groove is formed on a side circumferential wall of the auxiliary supporting part,

the first end of the main shaft forms an oil suction end, and the first oil suction hole and the second oil suction hole extend towards the interior of the main shaft at the oil suction end of the main shaft.

Further alternatively, the auxiliary support is formed at a position close to the oil suction end, and the main support is formed at a position away from the oil suction end, the main support having an outer diameter larger than that of the auxiliary support.

Further alternatively, the first oil groove is a spiral groove formed around the outer circumferential wall of the main supporting part,

the second oil groove is a circular ring groove or a spiral groove formed around the outer peripheral wall of the auxiliary supporting part.

Further optionally, the compressor crankshaft further comprises a balance weight and an eccentric shaft, the balance weight is located between the eccentric shaft and the main shaft and is arranged at the end of the main shaft far away from the oil suction end, the eccentric shaft is arranged eccentrically to the main shaft,

an oil outlet is formed in the eccentric shaft, a communicating hole is formed in the balance block, and the first oil groove is communicated with the oil outlet through the communicating hole.

In a second aspect, the present invention provides an inverter compressor comprising the compressor crankshaft.

Further optionally, the compressor comprises a motor, and a main shaft of a crankshaft of the compressor constitutes a driving shaft of the motor;

the motor support structure is characterized by further comprising a support plate, wherein the support plate is connected to the bottom of the motor, support holes are formed in the support plate, and the auxiliary support portion is arranged in the support holes in a penetrating mode.

Further optionally, a plurality of support legs are arranged on the support plate along the edge of the support plate, and the support legs abut against the bottom of the motor.

Further optionally, a connection through hole is formed in the support leg, and the connection through hole is matched with a connecting piece to fix the connection plate at the bottom of the motor.

Further optionally, a hollowed-out structure is arranged on the supporting plate.

Further optionally, the compressor further comprises a centrifugal pump assembly disposed at the oil suction end of the main shaft.

The multi-stage oil way is arranged on the main shaft of the compressor crankshaft, so that oil can be supplied to different parts of the main shaft, and the main shaft can be supported at the oil supply part. The multi-stage oil way can ensure effective lubrication of the main shaft, avoid the rotation of the main shaft to cause overlarge mechanical wear, and simultaneously can reduce the noise generated by operation.

Drawings

The above and other objects, features and advantages of the present disclosure will become more apparent by describing in detail exemplary embodiments thereof with reference to the attached drawings. The drawings described below are merely some embodiments of the present disclosure, and other drawings may be derived from those drawings by those of ordinary skill in the art without inventive effort.

FIG. 1 is a schematic view showing a structure of a crankshaft according to an embodiment of the present invention;

FIG. 2 is a schematic sectional view showing a part of the structure of a compressor according to an embodiment of the present invention;

fig. 3 shows a schematic structural diagram of a support plate according to an embodiment of the present invention.

In the figure:

11. a main shaft; 111. a first oil groove; 112. a second oil groove; 113. a first oil suction hole; 114. a second oil suction hole; 115. a main supporting section; 116. an auxiliary support portion; 12. a counterbalance; 13. an eccentric shaft; 2. a cylinder block; 3. a rotor; 4. a support plate; 41. a support hole; 42. a support leg; 5. a centrifugal pump assembly.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. 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.

The terminology used in the embodiments of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in the examples of the invention and the appended claims, the singular forms "a", "an", and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise, and "the plural" typically includes at least two, but does not exclude the presence of at least one.

It should be understood that the term "and/or" as used herein is merely one type of association that describes an associated object, meaning that three relationships may exist, e.g., a and/or B may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter related objects are in an "or" relationship.

It should also be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a good or system that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such good or system. Without further limitation, an element defined by the phrases "comprising one of \8230;" does not exclude the presence of additional like elements in an article or system comprising the element.

During the operation of the piston compressor, during the compression of the refrigerant, the piston, the connecting rod, etc. are subjected to an axial thrust, which is mainly balanced by the bearing support, and the bearing stress and mechanical wear are the most important mechanical loss parts of the piston compressor. By lengthening the length of the bearing hole of the cylinder block, the bearing stress arm is increased, the bearing stress is reduced, and the mechanical loss is reduced. But the length of the bearing hole is lengthened, on one hand, the cost is increased, and the processing difficulty is increased. On the other hand, the gravity center of the pump body is raised, so that the low-frequency vibration of the compressor is increased, and the stability and the noise of the operation of the compressor are influenced.

According to the invention, the auxiliary supporting part is arranged on the crankshaft and the supporting plate is used for supporting the crankshaft in an auxiliary manner, so that the bearing force of the supporting shaft is reduced, the mechanical friction loss is reduced, the efficiency of the compressor is improved and the service life of the compressor is prolonged; meanwhile, the gravity center of the compressor can be lowered, the vibration of the compressor during low-frequency operation is reduced, and the noise is reduced. The main bearing and the auxiliary supporting part are lubricated by arranging the multi-stage oil way on the main shaft of the crankshaft, and friction is reduced. The invention is described in detail below with reference to specific examples:

as shown in fig. 1, the present invention provides a compressor crankshaft, which includes a main shaft 11, a balance weight 12 and an eccentric shaft 13, wherein the balance weight 12 is located between the eccentric shaft 13 and the main shaft 11 and is disposed at an end of the main shaft 11 far from an oil suction end, and the eccentric shaft 13 is disposed eccentrically to the main shaft 11.

The main shaft 11 is formed with a multi-stage oil path for supplying oil to different positions, and the multi-stage oil path includes:

a first oil path including a first oil groove 111 and a first oil suction hole 113 communicating with the first oil groove 111;

a second oil path including a second oil groove 112 and a second oil suction hole 114 communicating with the second oil groove 112,

a first oil groove 111 and a second oil groove 112 are formed on a side circumferential wall of the main shaft 11, and a first oil suction hole 113 and a second oil suction hole 114 extend toward the inside of the main shaft 11 at an oil suction end of the main shaft 11.

The first end of the main shaft 11 forms an oil suction end, an auxiliary support 116 is formed on the main shaft 11 at a position close to the oil suction end, and the second oil groove 112 is an annular groove or a spiral groove formed around the outer circumferential wall of the auxiliary support 116. Preferably, the second oil groove 112 may be provided as a circular groove when the axial length of the auxiliary support 116 is short, and the second oil groove 112 may be provided as a spiral oil groove when the axial length of the auxiliary support 116 is long, so that it can cover a larger area of the support in the axial direction, thereby ensuring that a sufficient amount of lubricating oil can be supplied.

The main supporting part 115 is formed on the main shaft 11 away from the oil suction end, the main supporting part 115 is used for bearing fit with the main shaft 11, the part between the main supporting part 115 and the auxiliary supporting part 116 is used for connecting with the rotor 3 of the motor, the outer diameter of the main supporting part 115 is larger than that of the auxiliary supporting part 116 to ensure that the main shaft 11 can be successfully assembled with the rotor 3 of the motor, preferably, the difference between the diameters of the main supporting part 115 and the auxiliary supporting part 116 is 1mm-3mm, and further, the part of the main shaft 11 connected with the rotor 3 is the same as the outer diameter of the main supporting part 115. In the assembling process, the oil suction end of the main shaft 11 firstly penetrates through the bearing hole of the cylinder block 2 to be assembled with the motor rotor 3 and is fixed through interference fit of the main shaft 11 and the rotor 3. The upper part of the main shaft 11 is thus in interference fit with the rotor 3, and if the diameter of the auxiliary support 116 is the same as that of the main support 115, the auxiliary support 116 will have an effect on the cold pressing of the rotor 3, so that the diameter of the auxiliary support 116 at the lower part of the main shaft 11 is about 2mm smaller than that of the main support 115 at the upper part.

An oil outlet is formed on the eccentric shaft 13, a communication hole is formed on the balance block 12, and the first oil groove 111 is communicated with the oil outlet through the communication hole. The first oil groove 111 is formed spirally around the outer circumferential wall of the main shaft 11, and communicates with the communication hole of the weight 12 after passing through the main supporting portion 115. Preferably, the length of first oil groove 111 is long, and the length of second oil groove 112 is short, in this embodiment, the length of first oil groove 111 is 36mm, the length of second oil groove 112 is 8mm, and the specific lengths of first oil groove 111 and second oil groove 112 can be determined according to the specific size of the crankshaft, so that it is sufficient to provide a sufficient oil supply amount.

As shown in fig. 2, the present invention further provides an inverter compressor, which comprises the compressor crankshaft, specifically, the compressor comprises a motor and a cylinder block 2, and a main shaft 11 of the compressor crankshaft forms a driving shaft of the motor; the main shaft 11 is arranged in a shaft hole on the cylinder block 2 in a penetrating way, and the rotor 3 of the motor is connected to the main shaft 11 in an interference fit way. The compressor further comprises a centrifugal pump assembly 5, the centrifugal pump assembly 5 is arranged at the oil suction end of the main shaft 11, after assembly, the centrifugal pump assembly 5 extends into an oil storage pool at the bottom of the compressor, along with rotation of the crankshaft, the centrifugal pump sucks lubricating oil into the first oil suction hole 113 and the second oil suction hole 114, and the lubricating oil is supplied to the first oil groove 111 and the second oil groove 112 respectively.

As shown in fig. 2 and fig. 3, the inverter compressor further includes a supporting plate 4, the supporting plate 4 is connected to the bottom of the motor, a supporting hole 41 is formed in the supporting plate 4, and the auxiliary supporting portion 116 is inserted into the supporting hole 41. Specifically, the support plate 4 is provided with a plurality of support legs 42, the support legs 42 are arranged along the edge of the support plate 4, and the support legs 42 are abutted against the bottom of the motor. The auxiliary supporting part 116 passes through the supporting hole 41, and plays an auxiliary supporting role through the supporting hole 41 to share the bearing capacity of the bearing.

Preferably, the legs 42 are formed with attachment through holes that mate with connectors to secure the attachment plate to the bottom of the motor. Further, the connecting through holes can be arranged to be unthreaded holes or threaded holes, and the connecting through holes are conveniently connected with the motor through bolts.

Preferably, a hollow structure is provided on the supporting plate 4 to reduce the weight of the supporting plate 4, or the weight of the supporting plate can be adjusted by adjusting the shape of the supporting plate and whether it is hollow according to the requirement of the stability of the center of gravity of the compressor, thereby balancing the position of the center of gravity. Furthermore, the shape of the supporting plate 4 is mainly consistent with the structure of the machine foot of the cylinder seat 2, so that the coaxiality of the supporting hole 41 and the main shaft 11 is conveniently ensured, and the mounting and the fixing are convenient.

According to the invention, the bearing plate is additionally arranged below the motor, so that the auxiliary bearing effect on the crankshaft is realized, the bearing stress is shared, and the mechanical loss is reduced. In addition, the problems of difficult processing, poor part quality and overhigh gravity center of the pump body are solved while the mechanical loss is effectively reduced, the structure of the supporting plate is simple, the processing is easy, and the part quality is ensured. Meanwhile, the bearing plate is arranged at the lowest part, so that the gravity center of the pump body can be lowered, and the low-frequency vibration of the compressor can be reduced. The bearing plate is independently processed, a new cylinder seat with the size of a bearing hole does not need to be processed according to the design requirement of the bearing of the compressor, and the bearing stress condition of the compressor can be adjusted only by using the bearing plates with different thicknesses.

Exemplary embodiments of the present disclosure are specifically illustrated and described above. It is to be understood that the disclosure is not limited to the precise construction, arrangements, or instrumentalities described herein; on the contrary, the disclosure is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims.

Claims

1. A variable frequency piston compressor, comprising: the piston, the compressor crankshaft, the motor and the supporting plate;

the crankshaft of the compressor comprises a main shaft and an eccentric shaft, the eccentric shaft is positioned at the end part of the main shaft, and when the motor drives the main shaft to rotate, the main shaft drives the piston to reciprocate through the eccentric shaft;

the main shaft constitutes a driving shaft of the motor, and a multi-stage oil path is formed on the main shaft, and includes:

the main shaft is provided with a main supporting part and an auxiliary supporting part, the first oil groove is formed on the peripheral wall of the main supporting part, and the second oil groove is formed on the peripheral wall of the auxiliary supporting part;

the first end of the main shaft forms an oil suction end, and the first oil suction hole and the second oil suction hole extend towards the interior of the main shaft at the oil suction end of the main shaft;

the main supporting part is supported by a bearing, the auxiliary supporting part is supported by the supporting plate, the supporting plate is connected to the bottom of the motor, supporting holes are formed in the supporting plate, and the auxiliary supporting part penetrates through the supporting holes.

2. The variable frequency piston compressor of claim 1, wherein the auxiliary support is formed at a position close to the oil suction end, and the main support is formed at a position far from the oil suction end, and the main support has an outer diameter larger than that of the auxiliary support.

3. The variable frequency piston compressor as claimed in claim 1, wherein the first oil groove is a spiral groove formed around the outer circumferential wall of the main supporting part,

the second oil groove is a circular groove or a spiral groove formed around the outer circumferential wall of the auxiliary support part.

4. The variable frequency piston compressor of any one of claims 1 to 3, wherein the compressor crankshaft further comprises a counterbalance mass and an eccentric shaft, the counterbalance mass being located between the eccentric shaft and the main shaft and being disposed at an end of the main shaft remote from the oil suction end, the eccentric shaft being disposed eccentrically to the main shaft,

5. The inverter piston compressor of claim 1, wherein the support plate has a plurality of legs disposed along an edge of the support plate, the legs abutting against a bottom of the motor.

6. The inverter piston compressor of claim 5, wherein the legs are formed with connecting through holes, and the connecting through holes are matched with connecting pieces to fix the support plate on the bottom of the motor.

7. The variable frequency piston compressor according to any one of claims 1 to 3, 5 and 6, wherein the supporting plate is provided with a hollowed structure.

8. The variable frequency piston compressor of any one of claims 1-3, 5, 6, further comprising a centrifugal pump assembly disposed at an oil suction end of the main shaft.