CN112780549A

CN112780549A - Scroll compressor with labyrinth seal structure

Info

Publication number: CN112780549A
Application number: CN202110118130.5A
Authority: CN
Inventors: 徐太星; 沈亦晨
Original assignee: Xuxing New Energy Technology Suzhou Co Ltd
Current assignee: Xuxing New Energy Technology Suzhou Co Ltd
Priority date: 2021-01-28
Filing date: 2021-01-28
Publication date: 2021-05-11

Abstract

The invention relates to a scroll compressor with a labyrinth seal structure, which comprises a top cover and a shell which are connected up and down, wherein a driving mechanism is arranged in the shell and drives a movable scroll positioned between the top cover and the shell to rotate; the fixed vortex is provided with a fixed vortex tooth top surface meshed with the movable vortex tooth top surface, and the fixed vortex tooth top surface is provided with a fixed vortex sealing groove; the movable vortex sealing groove and the static vortex sealing groove are arranged on the top surface of the movable vortex tooth and the top surface of the static vortex tooth, so that the pressure of the finally flowing carbon dioxide is reduced, and the leakage of lubricating oil is avoided; and meanwhile, even a small amount of lubricating oil leaks, the lubricating oil can flow into the movable vortex sealing groove and the fixed vortex sealing groove to play a lubricating role, and the overall improvement cost is low.

Description

Scroll compressor with labyrinth seal structure

Technical Field

The invention belongs to the field of scroll compressors of new energy automobiles, and particularly relates to a scroll compressor with a labyrinth seal structure.

Background

Most of refrigerants adopted by the new energy automobile at present are R134a, although R134a is nontoxic and harmless, does not destroy ozone, is safe and reliable, the global warming index (GWP) is 1300, the problem of global greenhouse effect is aggravated, compared with other refrigerants, the refrigerant has the GWP index of 1, destroys Ozone (ODP) of 0, is nontoxic and harmless, and in addition, from the aspect of thermophysical properties, the refrigerant has relatively large refrigerating capacity per unit volume and smaller viscosity compared with other refrigerants, and the carbon dioxide gradually begins to replace other refrigerants.

However, in actual use, it is found that when the mao scroll compressor is applied to carbon dioxide as a refrigerant, the following problems are caused: the exhaust pressure of carbon dioxide is large due to the physical characteristics of the carbon dioxide, the high-low pressure difference can reach 10 MPa, and the large pressure difference is serious in leakage compared with the small pressure difference under the condition that the gap amount is not changed, so that the lubricating oil is leaked more in the tangential direction and the circumferential direction; meanwhile, the high pressure of the carbon dioxide can increase the friction force between the contact surfaces of the internal components of the vortex of the compressor, the input bearing power is consumed, the efficiency of the compressor is finally reduced, and meanwhile, the heat generated by the friction force can be absorbed by the carbon dioxide, so that exhaust gas is overheated.

Disclosure of Invention

The invention aims to overcome the defects of the prior art and provide a scroll compressor with a labyrinth seal structure, which can ensure that the pressure for discharging carbon dioxide is low, the leakage amount of lubricating oil is small, and simultaneously can solve the problem of friction force generated by the contact of internal parts of a scroll of the compressor.

In order to achieve the purpose, the invention adopts the technical scheme that: a scroll compressor with a labyrinth seal structure comprises a top cover and a shell which are connected up and down, wherein a driving mechanism is arranged in the shell and drives a movable scroll positioned between the top cover and the shell to rotate;

the movable vortex is provided with a movable vortex tooth top surface, and the movable vortex tooth top surface is provided with a plurality of movable vortex sealing grooves;

the fixed vortex is provided with a fixed vortex tooth top surface meshed with the movable vortex tooth top surface, and the fixed vortex tooth top surface is provided with a plurality of fixed vortex sealing grooves;

the two ends of the movable vortex sealing groove and the two ends of the fixed vortex sealing groove are sealed.

Furthermore, the movable vortex sealing groove and the fixed vortex sealing groove are in involute shapes according to molded lines.

Furthermore, the number of the movable vortex sealing grooves and the number of the fixed vortex sealing grooves are four.

Due to the application of the technical scheme, compared with the prior art, the invention has the following advantages:

the scroll compressor with the labyrinth seal structure is suitable for a scroll compressor taking carbon dioxide as a refrigerant, and the movable scroll seal groove and the static scroll seal groove are formed in the top surface of the movable scroll tooth and the top surface of the static scroll tooth, so that the labyrinth seal effect is achieved on carbon dioxide gas, the pressure of the final outflow of carbon dioxide is reduced, and the leakage of lubricating oil is avoided; even there is a small amount of lubricating oil to leak and also can flow into in moving vortex seal groove and the quiet vortex seal groove and play lubricated effect simultaneously, holistic improvement is with low costs, when in actual use, has higher practicality and popularization nature like this.

Drawings

The technical scheme of the invention is further explained by combining the accompanying drawings as follows:

FIG. 1 is a schematic structural view of the present invention with a top cover omitted in the first embodiment;

FIG. 2 is an enlarged view of portion A of FIG. 1;

FIG. 3 is an enlarged view of portion B of FIG. 1;

FIG. 4 is a schematic perspective view of an orbiting scroll in accordance with a first embodiment;

FIG. 5 is a schematic perspective view of a non-orbiting scroll according to the first embodiment;

FIG. 6 is a schematic structural view of a middle top cover, a fixed scroll and an orbiting scroll in a first embodiment;

FIG. 7 is a cross-sectional view of portion A of FIG. 6;

FIG. 8 is a schematic perspective view of a second embodiment of the non-orbiting scroll;

wherein: the floating seal disk comprises a floating seal disk 1, a shell 2, a driving mechanism 3, a movable vortex 4, a fixed vortex 5, an air inlet 10, an air outlet 11, a compression cavity 12, a floating seal disk air cavity 13, a movable vortex tooth top surface 40, a movable vortex seal groove 41, a fixed vortex tooth top surface 50, a fixed vortex seal groove 51 and a through hole 60.

Detailed Description

The invention is described in further detail below with reference to the figures and the embodiments.

Example one

Referring to fig. 1-7, a scroll compressor with a labyrinth seal structure according to an embodiment of the present invention includes a top cover (not shown in the drawings) and a housing 2, which are connected to each other from top to bottom, a non-orbiting scroll 5 and an orbiting scroll 4 are disposed in the top cover, a driving mechanism 3 is disposed in the housing 1, the driving mechanism 3 drives the orbiting scroll 4 disposed between the top cover and the housing 1 to rotate, and the orbiting scroll 4 and the non-orbiting scroll 5 are engaged with each other from top to bottom; a compression cavity 12 is arranged between the movable scroll 4 and the fixed scroll 5.

Referring to fig. 4, in the present embodiment, the movable scroll 4 has a movable scroll wrap top surface 40, the movable scroll wrap top surface 40 is in an annular labyrinth shape, and four movable scroll seal grooves 41 which are arranged in parallel and are in an annular shape are formed on the movable scroll wrap top surface 40.

Referring to fig. 3, in the present embodiment, the fixed scroll 5 has a fixed scroll top surface 50 engaged with the orbiting scroll top surface 40, and four orbiting scroll seal grooves 51 arranged in parallel and in a ring shape are formed on the fixed scroll top surface 50; the two ends of the movable scroll seal groove 41 and the fixed scroll seal groove 51 are sealed, that is, the two ends of the movable scroll seal groove 41 and the fixed scroll seal groove 51 do not penetrate through the movable scroll top surface 40 and the fixed scroll top surface 50 respectively.

Thus, when the scroll compressor is started, carbon dioxide flows in from the inlet port 10 and then flows out from the inlet port 11, and the carbon dioxide passes through the labyrinth structure formed by the orbiting scroll seal groove 41 and the non-orbiting scroll seal groove 51 on the way of the flow.

Carbon dioxide flows into the compression cavities 12 of the fixed vortex 5 and the movable vortex 5, and then flows to the matching surfaces of the fixed vortex 5 and the movable vortex 5 respectively, so that the carbon dioxide is contracted, the flow rate of the carbon dioxide is slowed, and the pressure is increased; then, the carbon dioxide enters the first fixed vortex sealing groove 51 of the fixed vortex 5, so that the expansion of the carbon dioxide is equal, the flow rate of the carbon dioxide is increased, and the pressure is reduced; then the carbon dioxide flows into the matching part of the static vortex and the movable vortex again, the carbon dioxide is contracted again, the flow rate of the carbon dioxide is slowed, and the pressure is increased; thus, the carbon dioxide is continuously contracted and expanded, and the pressure of the carbon dioxide is already low when the carbon dioxide comes out of the fourth non-orbiting scroll seal groove 51, and the lower the pressure, the smaller the leakage amount of the lubricating oil.

The principle of entry of carbon dioxide into the orbiting scroll seal groove 41 is the same as that of entry into the non-orbiting scroll seal groove 51.

In addition, even if some lubricating oil leaks slightly during the operation of the carbon dioxide scroll compressor, the lubricating oil can flow into the scroll flow groove 41 and the non-scroll seal groove 51, thereby playing a role of lubrication.

Of course, the movable scroll sealing groove and the fixed scroll sealing groove may have other shapes, and are not limited to the involute shape according to the profile in the embodiment, as long as the actual use requirements can be met; and the shapes of the sections of the movable vortex sealing groove and the fixed vortex sealing groove are not unique, so that the actual requirements are met.

Referring to fig. 8, the present invention also discloses another embodiment, which is different from the first embodiment in that: the fixed scroll 4 is also provided with a through hole 60, and a compression cavity is arranged between the movable scroll and the fixed scroll; a floating sealing disk 1 matched with the static vortex is arranged above the static vortex, and a floating sealing disk air cavity is arranged between the floating sealing disk 1 and the static vortex 5; such that the compression chamber communicates with said floating seal disk air chamber through said through-hole.

There is the carbon dioxide to flow during normal work, and when the carbon dioxide entered the unsteady sealed dish air cavity, the top cap was pushed up to the unsteady sealed dish upper end, can produce decurrent pressure, adjusted the pressfitting power of sound vortex through this through-hole 60, avoided pressure not enough, the vortex radial gas leakage.

The scroll compressor with the labyrinth seal structure is suitable for a scroll compressor taking carbon dioxide as a refrigerant, and the movable scroll and the static scroll are provided with the movable scroll seal groove and the static scroll seal groove, so that the labyrinth seal effect on carbon dioxide gas is achieved, the pressure of the final outflow of carbon dioxide is reduced, and the leakage of lubricating oil is avoided; even there is a small amount of lubricating oil to leak and also can flow into in moving vortex seal groove and the quiet vortex seal groove and play lubricated effect simultaneously, holistic improvement is with low costs, when in actual use, has higher practicality and popularization nature like this.

The above is only a specific application example of the present invention, and the protection scope of the present invention is not limited in any way. All the technical solutions formed by equivalent transformation or equivalent replacement fall within the protection scope of the present invention.

Claims

1. The utility model provides a take labyrinth seal structure's scroll compressor, includes top cap and the casing that links to each other from top to bottom and set up, be equipped with actuating mechanism in the casing, actuating mechanism drives the vortex that moves that is located between top cap and the casing and rotates, move the vortex with the meshing cooperation from top to bottom of quiet vortex, move the vortex with be equipped with compression chamber, its characterized in that between the quiet vortex:

2. The scroll compressor with labyrinth seal structure according to claim 1, wherein: the movable vortex sealing groove and the fixed vortex sealing groove are in involute shapes according to molded lines.

3. The scroll compressor with labyrinth seal structure according to claim 1, wherein: the number of the movable vortex sealing grooves and the number of the fixed vortex sealing grooves are four.