CN212803591U

CN212803591U - Surface coating piston

Info

Publication number: CN212803591U
Application number: CN202021295912.3U
Authority: CN
Inventors: 李华军; 王永昌; 柳泽林; 金盛江; 黄强胜
Original assignee: Huangshi Dongbei Electrical Appliance Co Ltd
Current assignee: Huangshi Donper Compressor Co Ltd
Priority date: 2020-07-03
Filing date: 2020-07-03
Publication date: 2021-03-26
Anticipated expiration: 2030-07-03

Abstract

The utility model discloses a surface coating piston, which belongs to the technical field of rotor compressors, and comprises a rotor and a slide block, wherein the outer peripheral wall of the rotor is provided with an axially through mounting groove, and the end part of the slide block is clamped into the mounting groove; and Teflon coatings are arranged on the outer circumferential surface, the upper surface and the lower surface of the piston. The utility model discloses a position at piston and cylinder inner wall contact sets up the special fluorine dragon coating, reduces the coefficient of friction of piston, reduces the wearing and tearing of piston, extension complete machine running life. And the Teflon coating can expand at the working temperature of the cylinder, so that the normal operation of the piston can be ensured, the gap between the outer diameter of the piston and the inner diameter of the cylinder is reduced, the leakage is reduced, and the efficiency of the compressor is improved.

Description

Surface coating piston

Technical Field

The utility model relates to a rotor compressor technical field, in particular to surface coating piston.

Background

The rotor type compressor is widely used in various electrical appliances due to its high efficiency, compact structure, small volume and light weight, for example: refrigerators, air conditioners, refrigerators, heat pump water heaters, and the like, mainly function to compress refrigerant gas from a low-temperature low-pressure state to a high-temperature high-pressure state. The compression assembly is an important part in the rotor compressor and mainly comprises a cylinder, a piston, a sliding vane and a crankshaft. The piston is positioned in the cylinder and sleeved on the crankshaft along the axial direction of the crankshaft. The air cylinder is provided with a sliding sheet groove, when the compression mechanism works, the head of the sliding sheet is tangent to the piston, the outer diameter of the piston is attached to the inner wall of the air cylinder, the sliding sheet is always in close contact with the inner wall of the air cylinder, a dynamic seal is formed, the interior of the air cylinder is divided into an air suction cavity and a compression cavity, and the air suction, compression and exhaust processes are completed under the driving of the crankshaft. The piston structure of the existing rotor compressor is of a roller type and a swing roller type, the materials of the piston structure are generally metal alloy materials, and in the operation process of the compressor, the piston and the inner wall of a cylinder move relatively, so that the stress abrasion is serious, and the efficiency of the compressor is influenced.

Chinese patent No. CN201710369584.3 discloses a cylinder, a processing method thereof and a rolling rotor compressor, wherein the structure and method of adding an adhesion layer formed by phosphating treatment on the inner wall of the cylinder are used to reduce the gap between the inner wall of the cylinder and the outer diameter of the piston, and because the adhesion layer is used for a long time, part of the adhesion layer on the inner diameter of the cylinder is removed by the friction of the piston, the gap is larger and larger, and the sealing performance of the compressor is further affected. And the structure of the adhesion layer has the problems of poor wear resistance, short service life, poor high temperature resistance and poor lubricating property.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a not enough to above prior art, the utility model aims to provide a surface coating piston sets up the special fluorine dragon coating through the position at piston and cylinder inner wall contact, reduces the coefficient of friction of piston, reduces the wearing and tearing of piston, extension complete machine running life. And the Teflon coating can expand at the working temperature of the cylinder, so that the normal operation of the piston can be ensured, the gap between the outer diameter of the piston and the inner diameter of the cylinder is reduced, the leakage is reduced, and the efficiency of the compressor is improved.

In order to achieve the above object, the present invention is specifically realized by the following techniques:

a surface coating piston comprises a rotor and a sliding block, wherein an axially through mounting groove is formed in the peripheral wall of the rotor, and the end part of the sliding block is clamped into the mounting groove;

and Teflon coatings are arranged on the outer circumferential surface, the upper surface and the lower surface of the piston.

Adopt above-mentioned technical scheme: the Teflon coating is arranged at the contact part of the piston and the inner wall of the cylinder, the friction coefficient of the Teflon coating is low, the friction coefficient of the piston can be reduced, the abrasion of the piston is reduced, the efficiency of the compressor is improved, and the service life of the whole compressor is prolonged. And because the surface material is polymer plastic, can expand under cylinder operating temperature, can reduce the clearance between piston external diameter and the cylinder internal diameter when guaranteeing piston normal operating, reduce and reveal, improve compressor efficiency.

Further, an expanded graphite layer is arranged between the piston and the Teflon coating.

The expanded graphite is a functional carbon material, and is a loose and porous vermicular substance obtained by intercalating, washing, drying and high-temperature expanding natural graphite flakes. When the expanded graphite is heated to a certain temperature, the compound occluded in the interlaminar lattice decomposes and begins to expand, and the expanded graphite is called expanded graphite or graphite worms and changes from original scaly to vermicular with very low density. The expanded graphite is also a good heat insulation layer, can effectively insulate heat and has the characteristic of low heat release rate. Therefore, at the working temperature of the cylinder, the friction between the piston and the inner wall of the cylinder generates heat, the heated volume of the expanded graphite expands, the setting force is large, the gap between the piston and the cylinder can be reduced, the cylinder can reach the optimal gap running state, the gas leakage is reduced, and the refrigerating capacity is improved. Secondly, the expanded graphite forms the insulating layer, can prevent that a large amount of heat transfer from to the piston inside in the short time and arouse the lattice distortion, avoids the piston to receive thermal shock damage, carries out adiabatic protection to the piston inside through the insulating layer promptly. The Teflon coating layer positioned on the outer side of the expanded graphite layer can form a protective layer, so that the expanded graphite is prevented from adsorbing oils, organic molecules, hydrophobic substances and the like, and the service life of the expanded graphite layer is prolonged

Further, a chromium-based diamond layer is arranged between the expanded graphite layer and the Teflon coating. Because the expandable graphite is flexible material, can reduce the hardness of piston to a certain extent, consequently, set up chromium base diamond layer, can effectively form the hardness gradient from expandable graphite layer to chromium base diamond layer, and then increase composite biocoating's anti mar, wear-resisting and anti stripping ability for the piston possesses good life.

Furthermore, a cementing layer is arranged between the expanded graphite layer and the piston, and the cementing layer is organic silicon modified phenolic resin. The expansion graphite layer and the piston have good bonding strength through the cementing layer and are not easy to fall off.

Furthermore, the thickness of the expanded graphite layer is 1-3 μm. The thickness of the expanded graphite layer is preferably set to 1 to 3 μm, and more preferably 1.6 to 2.2 μm, because the sealing effect is reduced and the sliding of the piston is affected by the excessive thickness of the expanded graphite layer.

Further, the thickness of the Teflon coating is 10-15 microns.

Further, the thickness of the chromium-based diamond layer is 4-6 microns.

Furthermore, the thickness of the cementing layer is 0.5-1 μm.

Further, be equipped with the arch on the inner wall of mounting groove, the tip of slider be equipped with protruding complex recess, through recess and protruding cooperation with will the slider is stable to be fixed on the rotor, the circular motion is done by eccentric crankshaft drive to the piston in the cylinder to drive the gleitbretter and carry out reciprocating motion, the operation is more smooth and easy, effectively avoids appearing the card phenomenon of dying.

The utility model has the advantages that:

1. the Teflon coating is arranged at the contact part of the piston and the inner wall of the cylinder, so that the friction coefficient of the piston is reduced, the abrasion of the piston is reduced, and the service life of the whole machine is prolonged. And the Teflon coating can expand at the working temperature of the cylinder, so that the normal operation of the piston can be ensured, the gap between the outer diameter of the piston and the inner diameter of the cylinder is reduced, the leakage is reduced, and the efficiency of the compressor is improved.

2. Further set up the expanded graphite layer in the below of teflon coating, utilize expanded graphite's characteristic that is heated and expanded, make the cylinder reach the best clearance running state, be favorable to promoting sealed effect. And the Teflon coating layer positioned on the outer side of the expanded graphite layer can form a protective layer, so that the expanded graphite is prevented from adsorbing oils, organic molecules, hydrophobic substances and the like, and the service life of the expanded graphite layer is prolonged.

3. The hardness gradient from the expanded graphite layer to the chromium-based diamond layer can be effectively formed by additionally arranging the chromium-based diamond layer, so that the scratch resistance, abrasion resistance and stripping resistance of the composite coating are improved, and the service life of the piston is greatly prolonged.

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 described 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 without creative efforts.

FIG. 1 is a schematic view of the structure of a surface-coated piston of example 1;

FIG. 2 is a schematic view of the structure of FIG. 1 in the direction A-A;

FIG. 3 is a schematic structural view of a surface-coated piston according to embodiment 2;

in the figure, 1, a piston; 11. a rotor; 12. a slider; 13. a protrusion; 14. a groove; 2. a Teflon coating; 3. an expanded graphite layer; 4. a chromium-based diamond layer; 5. and (4) a cementing layer.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. It is obvious that the described embodiments are only some of the embodiments of the present invention, and not all of them. Based on the embodiments of the present invention, all other embodiments obtained by a person of ordinary skill in the art without creative efforts belong to the protection scope of the present invention.

Example 1

A piston with a surface coating is disclosed, referring to fig. 1-2, the piston 1 comprises a rotor 11 and a slide block 12, an axially through mounting groove is formed in the peripheral wall of the rotor 11, and the end part of the slide block 12 is clamped into the mounting groove to form fixed connection; in order to improve locking force, be equipped with protruding 13 on the inner wall of mounting groove, the tip of slider 12 be equipped with protruding 13 complex recess 14, with will slider 12 is stably fixed on rotor 11, rotor 11 is circular motion by eccentric crankshaft drive in the cylinder to drive the gleitbretter and carry out reciprocating motion, the operation is more smooth and easy, effectively avoids appearing the card phenomenon of dying. The outer circumference and the upper and lower surface of piston 1 are equipped with teflon coating 2 (polytetrafluoroethylene coating), promptly the outer circumference and the upper and lower surface of rotor 11 and the upper and lower surface spraying of slider 12 have teflon coating 2, teflon coating 2's thickness is 10 ~ 15 mu m.

Adopt above-mentioned technical scheme: the Teflon coating 2 is arranged at the contact part of the piston 1 and the inner wall of the cylinder, the friction coefficient is low, the friction coefficient of the piston 1 can be reduced, the abrasion of the piston 1 is reduced, the efficiency of the compressor is improved, and the service life of the whole compressor is prolonged. And because the surface material is polymer plastic, can expand under cylinder operating temperature, can reduce the clearance between piston 1 external diameter and the cylinder internal diameter when guaranteeing piston 1 normal operating, reduce and reveal, improve compressor efficiency.

Example 2

Example 2 is essentially the same as example 1, except that: referring to fig. 3, an expanded graphite layer 3 is arranged between the piston 1 and the teflon coating layer 2, the thickness of the expanded graphite layer 3 is 1-3 μm, and more preferably, the thickness of the expanded graphite layer 3 is 1.6-2.2 μm; the expanded graphite layer 3 is tightly combined with the alloy material of the piston 1 through a cementing layer 5, and the thickness of the cementing layer 5 is 0.5-1 mu m; the cementing layer 5 is organic silicon modified phenolic resin with good high temperature resistance and oxidation resistance, and good bonding strength between the two is ensured. Further, the expanded graphite layer 3 is arranged below the Teflon coating layer 2, the Teflon coating layer 2 can reduce friction force and form a protective layer, so that the expanded graphite is prevented from adsorbing oils, organic molecules, hydrophobic substances and the like, and the service life of the expanded graphite layer 3 is prolonged. And the characteristic that the expanded graphite is heated and expanded is utilized, so that the air cylinder can reach the optimal clearance running state, the sealing effect is favorably improved, the gas leakage is reduced, and the refrigerating capacity is improved. And the expanded graphite can be used as a heat insulating layer, so that lattice distortion caused by a large amount of heat transferred to the interior of the piston 1 in a short time is prevented, and the piston 1 is prevented from being damaged by thermal shock.

Because the expanded graphite is a flexible material, the hardness of the piston 1 can be reduced to a certain degree, and therefore, in the embodiment, a chromium-based diamond layer 4 is additionally arranged between the expanded graphite layer 3 and the teflon coating layer 2, and the thickness of the chromium-based diamond layer 4 is 4-6 μm; the expanded graphite layer 3 and the chromium-based diamond layer 4 can also be bonded through a cementing layer 5, the thickness of the cementing layer 5 is 0.5-1 mu m, a hardness gradient from the expanded graphite layer 3 to the chromium-based diamond layer 4 is formed, and then the scratch resistance, abrasion resistance and stripping resistance of the composite coating are enhanced, so that the piston 1 has a good service life.

Claims

1. The piston with the surface coating is characterized in that the piston (1) comprises a rotor (11) and a sliding block (12), an axially through mounting groove is formed in the peripheral wall of the rotor (11), and the end part of the sliding block (12) is clamped into the mounting groove;

the outer circumferential surface and the upper and lower surfaces of the piston (1) are provided with Teflon coatings (2).

2. A surface-coated piston according to claim 1, characterized in that an expanded graphite layer (3) is provided between the piston (1) and the teflon coating (2).

3. A surface-coated piston according to claim 2, characterized in that a layer of chromium-based diamond (4) is provided between the expanded graphite layer (3) and the teflon coating (2).

4. A surface-coated piston according to claim 2, characterized in that a cementing layer (5) is arranged between the expanded graphite layer (3) and the piston (1), and the cementing layer (5) is an organosilicon-modified phenolic resin.

5. A surface-coated piston according to claim 2, characterized in that the thickness of the expanded graphite layer (3) is 1 to 3 μm.

6. A surface-coated piston according to any one of claims 1 to 5, characterized in that the Teflon coating (2) has a thickness of 10 to 15 μm.

7. A surface-coated piston according to claim 3, characterized in that the thickness of the chromium-based diamond layer (4) is 4 to 6 μm.

8. The surface-coated piston of claim 4, characterized in that the thickness of the binder layer (5) is 0.5 to 1 μm.

9. Surface-coated piston according to claim 1, characterized in that the inner wall of the mounting groove is provided with a protrusion (13) and the end of the slide (12) is provided with a recess (14) cooperating with the protrusion (13).