CN116044765A

CN116044765A - Oil supply assembly, pump body assembly and scroll compressor

Info

Publication number: CN116044765A
Application number: CN202211095950.8A
Authority: CN
Inventors: 陈可; 朱熠; 文翔; 石成志; 李伟
Original assignee: Gree Electric Appliances Inc of Zhuhai
Current assignee: Gree Electric Appliances Inc of Zhuhai
Priority date: 2022-09-08
Filing date: 2022-09-08
Publication date: 2023-05-02

Abstract

The application provides an oil supply assembly, a pump body assembly and a scroll compressor. The oil supply assembly supplies lubricating oil to a crankshaft center oil hole, and comprises: at least two impeller assemblies, each impeller assembly comprising a flow passage and an impeller, the impeller being disposed in the flow passage; the inlet and the outlet of the runner are arranged at the two axial ends of the impeller, the runner also comprises an arc-shaped section, the lubricating oil enters the impeller along the axial direction through the inlet of the runner, leaves the impeller along the radial direction, and is discharged from the outlet of the runner through the arc-shaped section. This application adopts the mode that a plurality of impellers overlap and set up, and the rotation of a plurality of impellers adopts the mode of increase pressure differential to carry out the oil feed, through losing a small amount of power, increases the kinetic energy of lubricating oil to flow resistance reduces, reduces the power loss of compressor, makes the compressor power decline, realizes the improvement of energy efficiency.

Description

Oil supply assembly, pump body assembly and scroll compressor

Technical Field

The application belongs to the technical field of scroll compressors, and particularly relates to an oil supply assembly, a pump body assembly and a scroll compressor.

Background

At present, commercial air conditioners are widely applied to various fields, the commercial air conditioners are widely applied to vortex compressors, a high-pressure cavity is often positioned at the upper part of the compressor according to the characteristics of the vortex compressors, a special oil supply structure is needed to meet the lubricating reliability requirement of the high-pressure cavity, and a differential pressure oil supply mode and an oil pump oil supply mode are adopted at present.

However, with the development of high speed of the compressor, the requirement on lubrication of a pump body is higher and higher, the requirement on the oil supply form at the bottom of an oil pool is higher and higher, the problem of difficult oil supply caused by high frequency is solved by adopting an oil pump oil supply mode, but the energy efficiency of the scroll compressor is affected by faster power rise of the oil pump with the rise of the running frequency of the compressor by adopting the oil pump oil supply mode.

Disclosure of Invention

Therefore, the application provides an oil supply assembly, a pump body assembly and a scroll compressor, and the problems that in the prior art, the oil supply mode of an oil pump is faster along with the increase of the running frequency of the compressor, and the power of the oil pump is increased, so that the energy efficiency of the scroll compressor is affected can be solved.

In order to solve the above-mentioned problem, this application provides an oil feeding unit, supplies lubricating oil to crankshaft center oilhole, includes:

at least two impeller assemblies, each impeller assembly comprising a flow passage and an impeller, the impeller being disposed in the flow passage; the inlet and the outlet of the runner are arranged at two axial ends of the impeller, the runner also comprises an arc section, the lubricating oil enters the impeller along the axial direction through the inlet of the runner, leaves the impeller along the radial direction, and is discharged from the outlet of the runner through the arc section;

all the impeller assemblies are overlapped along the axial direction of the impeller; the outlets of the upstream flow channels of two adjacent flow channels are communicated with the inlets of the downstream flow channels; the outlet of the impeller assembly at the most downstream is communicated with the crankshaft central oil hole.

Optionally, all impellers are coaxially arranged and fixedly connected with the crankshaft.

Optionally, the oil supply assembly further comprises a sleeve, and the shaft of the impeller is fixedly connected with the crankshaft through the sleeve; the sleeve is provided with a radial through hole, and the lubricating oil sequentially flows to the central hole of the sleeve and the central oil hole of the crankshaft after passing through the radial through hole.

Optionally, the radial through holes are arranged in a tangential direction of the sleeve.

Optionally, a plurality of radial through holes are arranged along the axial direction and/or the circumferential direction and are uniformly distributed.

Optionally, the impeller is a closed impeller, the closed impeller comprises a wheel disc, a hub, blades and a cover plate, a shaft hole is formed in the center of the wheel disc, and the hub is fixed on the wheel disc and is communicated with the shaft hole; the cover plate is annular and is arranged opposite to the wheel disc; the blades are arranged in a plurality and are uniformly distributed between the wheel disc and the cover plate; the cover plate center hole forms an inlet of the impeller, two adjacent blades, the cover plate and the wheel disc enclose a fluid channel, and an outlet of the impeller is formed at the outer periphery of the wheel disc.

Optionally, the cover plate is provided as a concave arc plate.

Optionally, when two impeller assemblies are provided, the upstream impeller size is larger than the downstream impeller size.

According to another aspect of the present application, there is provided a pump body assembly comprising an oil supply assembly as described above.

According to a further aspect of the present application there is provided a scroll compressor comprising an oil supply assembly as described above or a pump body assembly as described above.

The application provides an oil feeding unit supplies lubricating oil to bent axle center oilhole, includes: at least two impeller assemblies, each impeller assembly comprising a flow passage and an impeller, the impeller being disposed in the flow passage; the inlet and the outlet of the runner are arranged at two axial ends of the impeller, the runner also comprises an arc section, the lubricating oil enters the impeller along the axial direction through the inlet of the runner, leaves the impeller along the radial direction, and is discharged from the outlet of the runner through the arc section; all the impeller assemblies are overlapped along the axial direction of the impeller; the outlets of the upstream flow channels of two adjacent flow channels are communicated with the inlets of the downstream flow channels; the outlet of the impeller assembly at the most downstream is communicated with the crankshaft central oil hole.

This application adopts the mode that a plurality of impellers overlap and set up, and the rotation of a plurality of impellers adopts the mode of increase pressure differential to carry out the oil feed, through losing a small amount of power, increases the kinetic energy of lubricating oil to flow resistance reduces, reduces the power loss of compressor, makes the compressor power decline, realizes the improvement of energy efficiency.

Drawings

FIG. 1 is a schematic view of a scroll compressor according to an embodiment of the present application;

fig. 2 is a schematic structural view of an oil supply assembly according to an embodiment of the present application;

FIG. 3 is a schematic view of an impeller according to an embodiment of the present application;

FIG. 4 is a fluid simulation effect diagram of a dual stage impeller according to an embodiment of the present application;

fig. 5 is a diagram comparing the oil supply amount of the embodiment of the present application with that of the conventional structure.

The reference numerals are expressed as:

1. a crankshaft; 11. a central oil hole; 2. an impeller assembly; 21. an impeller; 212. a cover plate; 213. a blade; 214. a hub; 22. an arc section; 23. an inlet of the flow channel; 24. an outlet of the flow channel; 25. a sleeve; 211. wheel disc.

Detailed Description

For the purposes, technical solutions and advantages of the present application, the technical solutions of the present application will be clearly and completely described below with reference to specific embodiments of the present application and corresponding drawings. It will be apparent that the described embodiments are only some, but not all, of the embodiments of the present application. All other embodiments, which can be made by one of ordinary skill in the art without undue burden from the present disclosure, are within the scope of the present disclosure.

It should be noted that the terms "first," "second," and the like in the description and claims of the present application and the above figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate such that embodiments of the present application described herein may be implemented in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.

Referring to fig. 1 to 5 in combination, according to an embodiment of the present application, an oil supply unit supplies lubricating oil to a center oil hole 11 of a crankshaft 1, comprising:

at least two impeller assemblies 2, each of the impeller assemblies 2 comprising a flow channel and an impeller 21, the impeller 21 being provided in the flow channel; the inlet 23 and the outlet of the runner are arranged at two axial ends of the impeller 21, the runner also comprises an arc-shaped section 22, the lubricating oil enters the impeller 21 along the axial direction through the inlet 23 of the runner, leaves the impeller 21 along the radial direction, and is discharged from the outlet 24 of the runner through the arc-shaped section 22;

all the impeller assemblies 2 are overlapped along the axial direction of the impeller 21; the outlets 24 of the flow channels at the upstream of two adjacent flow channels are communicated with the inlets 23 of the flow channels at the downstream; the outlet of the impeller assembly 2 at the most downstream communicates with the central oil hole 11 of the crankshaft 1.

This application adopts the mode that a plurality of impellers 21 overlap the setting, and the rotation of a plurality of impellers 21 adopts the mode of increase pressure differential to supply oil, through losing a small amount of power, increases the kinetic energy of lubricating oil to flow resistance descends, reduces the power loss of compressor, makes the compressor power decline, realizes the improvement of compressor efficiency.

According to the multi-stage rotary impeller assembly 2, the fluid potential energy is increased, the inlet oil pressure of the central oil hole 11 is improved, and the oil supply flow and the lift of the compressor are improved by arranging the multi-stage rotary impeller assembly 2 at the bottom inlet of the central oil hole 11 of the crankshaft 1; because the potential energy of the lubricating oil is increased, the kinetic energy and the flow resistance which relatively enter the central oil hole 11 are increased, the power consumption loss of the compressor can be effectively reduced, the vibration of the compressor is reduced, the reliability of the compressor is improved, and the energy efficiency of the compressor is improved.

Wherein the upstream and downstream are defined according to the flow direction of the lubricating oil in the flow passage.

In some embodiments, all of the impellers 21 are coaxially disposed and fixedly coupled to the crankshaft 1.

All impellers 21 are coaxially arranged, and the shaft is fixedly connected with the crankshaft 1, so that the crankshaft 1 directly drives all the impellers 21 to rotate, and the oil conveying capacity of the impellers 21 to the central oil hole 11 correspondingly changes along with the change of the rotating speed of the crankshaft 1; for example, the multi-stage impeller 21 rotates at a high speed, the oil delivery pressure difference is larger, the oil supply amount is large, the lift is high, and the work loss of the compressor is reduced.

In some embodiments, the oil supply assembly further comprises a sleeve 25, and the shaft of the impeller 21 is fixedly connected with the crankshaft 1 through the sleeve 25; the sleeve 25 is provided with a radial through hole, and the lubricating oil sequentially flows to the central hole of the sleeve 25 and the central oil hole 11 of the crankshaft 1 after passing through the radial through hole.

The impeller 21 is connected to the crankshaft 1 by a sleeve 25, the sleeve 25 has a hollow straight-tube structure, and radial through holes can be formed in the side wall, so that lubricating oil enters the sleeve 25 through the radial through holes after the impeller 21 is pressurized, and is guided to the central oil hole 11.

Preferably, the radial through holes are arranged in a tangential direction of said sleeve 25. And a plurality of radial through holes are arranged along the axial direction and/or the circumferential direction and are uniformly distributed.

The oil supply device can rotate along with the rotation of the compressor crankshaft 1 through the sleeve 25 fixedly connected to the tail end of the crankshaft 1. Meanwhile, a radial through flow hole or even a tangential through flow hole is designed at the tail end of the sleeve 25, so that the flow resistance of lubricating oil is reduced, and the oil supply quantity of an inlet of the crankshaft 1 is improved;

the sleeve 25 is in win-win fit with the crankshaft 1 and the central oil hole 11, a radial through hole is formed in the upper portion of the sleeve 25, and lubricating oil can enter the lower end of the crankshaft 1 through the through hole and enter the central oil hole 11 of the crankshaft 1. The sleeve 25 and the multistage impeller 21 are fixed to realize concentric rotation of the impeller 21 and the crankshaft 1.

The sleeve 25 and the crankshaft 1 are connected in an interference fit manner, so that the impeller 21 mechanism can rotate along with the crankshaft 1 at the same time, and the integral mechanical work loss of the compressor can be greatly reduced; meanwhile, although a part of acting loss can be increased by the impeller 21 mechanism, the oil supply mode of increasing the pressure difference is generally adopted, and the kinetic energy of fluid can be increased through the change of pressure gradient, so that the flow resistance of viscous fluid of lubricating oil is reduced, the indicated power loss of the compressor is reduced, the power of the compressor is reduced, and the energy efficiency of the compressor is improved.

In some embodiments, impeller 21 is provided as a shrouded impeller comprising wheel disc 211, hub 214, blades 213, and cover plate 212, wherein wheel disc 211 is centrally provided with a shaft hole, and hub 214 is fixed to wheel disc 211 and communicates with the shaft hole; cover 212 is formed in a ring shape and is disposed opposite to wheel 211; the blades 213 are provided in plurality and are uniformly distributed between the wheel disc 211 and the cover plate 212; the center hole of the cover plate 212 constitutes an inlet of the impeller 21, two adjacent blades 213, the cover plate 212 and the wheel disc 211 enclose a fluid passage, and an outlet of the impeller 21 is formed at the outer circumference of the wheel disc 211. Preferably, the cover plate 212 is provided as a concave arcuate plate.

By adopting the closed impeller 21 structure, better pressurization oil supply and oil supply improvement can be realized. In particular, the cover plate 212 is a concave arc plate, so that the flow resistance of lubricating oil is reduced, and the energy loss is reduced. The shape of the blades 213 may be a right angle blade 213 configuration as shown in the figures, or may be replaced with a streamlined blade 213 configuration.

In some embodiments, when two impeller assemblies 2 are provided, the upstream impeller 21 is larger in size than the downstream impeller 21.

When the compressor is operated, the primary impeller 21 and the secondary impeller 21 are rotated to generate a pressure gradient change, thereby generating a pressure difference to increase the oil supply amount. Wherein the primary impeller 21 is an upstream impeller 21 and the secondary impeller 21 is a downstream impeller 21. Firstly, the lubricating oil at the bottom of the compressor generates centrifugal action through the rotation of the bottom of the primary impeller 21, the lubricating oil is sucked into the primary impeller 21, meanwhile, a negative pressure area is generated around the blades 213 of the primary impeller 21, the fluid flow can move along the high pressure to the low pressure, the lubricating oil can flow outwards along the blades 213, the flowing direction of the lubricating oil is changed, the pressure is changed due to the rotation of the rotary impeller 21, the driving force of the fluid is increased, and the flow rate of the lubricating oil is increased. Lubricating oil can flow into the central areas of the primary impeller 21 and the secondary impeller 21, lubricating oil in the concentric area can enter from the bottom of the secondary impeller 21, two-stage pressure change is realized through the centrifugal action of the blades 213, and the total pressure difference of an inlet and an outlet is increased, so that the oil supply amount of the inlet of the crankshaft 1 is increased, and the fluid lubrication of a compressor is improved.

Meanwhile, the impeller 21 is of a central symmetry structure, so that asymmetric impact phenomenon during rotation is avoided, oil supply at the bottom of the compressor is stable, vibration and noise of the compressor are reduced, and comprehensive performance of the compressor is improved.

The primary impeller 21 and the secondary impeller 21 can be the same in mechanism size, and the impellers 21 can be combined according to grades, wherein the primary impeller 21 is larger than the secondary impeller 21, so that the whole oil supply mechanism shows gradient change.

The existing oil pool pressure is changed through the rotary compression of two or more blades 213, the inlet pressure of an oil way of the crankshaft 1 is increased, and the oil supply quantity of the compressor is increased through differential pressure oil supply; meanwhile, differential pressure oil supply is adopted, so that the acting loss of the compressor is reduced, the indicated power consumption loss of the compressor is reduced, the performance of the compressor is improved, the oil supply is improved, the energy of the compressor is improved, and the comprehensive performance of the compressor is further improved. The two or more stages of supercharging oil supply can also effectively reduce the cost of the compressor and promote the market competitiveness.

It is easy to understand by those skilled in the art that the above embodiments can be freely combined and overlapped without conflict.

The foregoing description of the preferred embodiments of the present application is not intended to be limiting, but is intended to cover any and all modifications, equivalents, and alternatives falling within the spirit and principles of the present application. The foregoing is merely a preferred embodiment of the present application, and it should be noted that, for a person skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present application, and these improvements and modifications should also be considered as the protection scope of the present application.

Claims

1. An oil supply unit for supplying lubricating oil to a center oil hole (11) of a crankshaft (1), comprising:

-at least two impeller assemblies (2), each of said impeller assemblies (2) comprising a flow channel and an impeller (21), said impeller (21) being arranged in said flow channel; the inlet (23) and the outlet of the runner are arranged at two axial ends of the impeller (21), the runner also comprises an arc-shaped section (22), the lubricating oil enters the impeller (21) through the inlet (23) of the runner along the axial direction, leaves the impeller (21) along the radial direction, and is discharged from the outlet (24) of the runner through the arc-shaped section (22);

all the impeller assemblies (2) are overlapped along the axial direction of the impeller (21); the outlets (24) of the flow channels at the upstream of two adjacent flow channels are communicated with the inlets (23) of the flow channels at the downstream; the outlet of the impeller assembly (2) at the most downstream is communicated with a central oil hole (11) of the crankshaft (1).

2. An oil supply assembly according to claim 1, characterized in that all the impellers (21) are coaxially arranged and fixedly connected to the crankshaft (1).

3. The oil supply assembly according to claim 2, characterized in that it further comprises a sleeve (25), the shaft of the impeller (21) being fixedly connected with the crankshaft (1) via the sleeve (25); the sleeve (25) is provided with a radial through hole, and the lubricating oil sequentially flows to the central hole of the sleeve (25) and the central oil hole (11) of the crankshaft (1) after passing through the radial through hole.

4. An oil supply assembly according to claim 3, characterized in that the radial through holes are arranged in the tangential direction of the sleeve (25).

5. An oil supply assembly according to claim 3, wherein the radial through holes are provided in plurality in the axial direction and/or the circumferential direction and are uniformly distributed.

6. The oil supply assembly according to any one of claims 1-5, characterized in that the impeller (21) is provided as a closed impeller, the closed impeller comprises a wheel disc (211), a hub (214), blades (213) and a cover plate (212), a shaft hole is arranged in the center of the wheel disc (211), and the hub (214) is fixed on the wheel disc (211) and is communicated with the shaft hole; the cover plate (212) is annular and is arranged opposite to the wheel disc (211); the blades (213) are provided with a plurality of blades and are uniformly distributed between the wheel disc (211) and the cover plate (212); the central hole of the cover plate (212) forms an inlet of the impeller (21), two adjacent blades (213), the cover plate (212) and the wheel disc (211) enclose a fluid channel, and an outlet of the impeller (21) is formed at the outer periphery of the wheel disc (211).

7. The oil supply assembly according to claim 6, characterized in that the cover plate (212) is provided as a concave arc-shaped plate.

8. The oil supply assembly according to claim 6, characterized in that when the impeller assembly (2) is provided with two, the upstream impeller (21) is larger in size than the downstream impeller (21).

9. Pump body assembly, characterized in that it comprises an oil supply assembly according to any one of claims 1-8.

10. A scroll compressor comprising the oil supply assembly of any one of claims 1 to 8 or the pump body assembly of claim 9.