Compressor and refrigeration apparatus

Abstract

The application provides a compressor and a refrigeration device, the compressor comprising a cylinder body, a crankshaft, a sliding vane and a roller, a cylinder chamber being formed in the cylinder body, the roller, the sliding vane and an eccentric part of the crankshaft being located in the cylinder chamber, the roller being installed on the eccentric part, the sliding vane abutting against an outer peripheral wall of the roller, and a refrigeration oil being arranged at the bottom of the cylinder chamber. At least one of the outer peripheral wall of the roller and an end wall of the sliding vane is provided with a nano ceramic coating. In the material for forming the nano ceramic coating, the content of zirconium oxide is 80-90% by weight percentage, the content of aluminum oxide is 9-20% by weight percentage, the content of silicon oxide is 0-1% by weight percentage, the content of titanium oxide is 0-1% by weight percentage, and the content of magnesium oxide is 0-1% by weight percentage. The refrigeration oil comprises a base oil and an additive, the additive comprising a polyamide ester, and the content of the polyamide ester in the refrigeration oil is 3-5% by weight percentage. The refrigeration oil in the compressor can effectively reduce the friction and agglomeration between particles and realize uniform dispersion of the particles.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of compressors, in particular to a compressor and a refrigeration device. BACKGROUND

[0002] At present, the problem of compressor wear is solved by setting a nano ceramic coating wear-resistant layer on the outer circumferential surface of the roller and the sliding vane, so as to reduce the friction and wear of the roller and the sliding vane, improve the performance and energy efficiency of the rotor compressor, and prolong the service life of the rotor compressor.

[0003] In the structure of the rotor compressor, the contact between the end of the sliding vane and the outer circumferential surface of the roller is boundary lubrication, which is prone to produce abrasive wear. Abrasive wear is caused by hard points rubbing the surface of the part. During the wear process, base particles will inevitably fall off from the base and mix into the refrigeration oil.

[0004] However, the oil solubility of nano particles, especially inorganic nano ceramic particles, is poor, the surface energy is high, and the particle size is small. After falling off during the wear process, they are easy to agglomerate into large particles in the refrigeration oil, further aggravating the wear of the rotor compressor and affecting the use of the rotor compressor. SUMMARY

[0005] The first object of the present application is to provide a compressor in which the refrigeration oil can effectively reduce the friction and agglomeration between particles, thereby achieving uniform dispersion of particles.

[0006] The second object of the present application is to provide a refrigeration device using the above-mentioned compressor.

[0007] To achieve the above-mentioned first object, the present application provides a compressor, which comprises a cylinder body, a crankshaft, a sliding vane and a roller. A cylinder chamber is formed in the cylinder body. The roller, the sliding vane and the eccentric part of the crankshaft are located in the cylinder chamber. The roller is installed on the eccentric part, and the sliding vane abuts against the outer circumferential wall of the roller. The bottom of the cylinder chamber is provided with refrigeration oil. A nano ceramic coating is provided on at least one of the outer circumferential wall of the roller and the end wall of the sliding vane. In the material of the nano ceramic coating, the content of zirconium oxide is 80% to 90% by weight, the content of aluminum oxide is 9% to 20% by weight, the content of silicon oxide is 0 to 1% by weight, the content of titanium oxide is 0 to 1% by weight, and the content of magnesium oxide is 0 to 1% by weight. The refrigeration oil comprises base oil and additives. The additives comprise polyamide ester, and the content of the polyamide ester in the refrigeration oil is 3% to 5% by weight.

[0008] As can be seen from the above scheme, in the process of the compressor working, the roller rolls along the inner wall of the cylinder body in the cylinder chamber, and friction and wear are prone to occur between the outer peripheral wall of the roller and the end wall of the sliding vane. By setting the nano ceramic coating, the friction coefficient between the roller and the sliding vane can be significantly reduced, for example, the above friction coefficient can be reduced to less than 0.05, so that the friction and wear of the roller and the sliding vane can be significantly reduced, the performance and energy efficiency of the rotary compressor can be improved, the noise generated by the rotary compressor due to friction can be reduced, and the service life of the rotary compressor can be prolonged. Although the nano ceramic coating can greatly reduce the friction and wear of the roller and the sliding vane, a small amount of abrasive wear still occurs inevitably, resulting in the falling off of the nano ceramic coating particles. The inorganic nano ceramic particles have poor oil solubility, high surface energy and small particle size, and are prone to agglomerate to form large particles in the refrigerant oil after falling off in the wear process, thereby further aggravating the wear of the rotary compressor and affecting the use of the rotary compressor. However, the existing refrigerant oil cannot effectively disperse the nano particles in the lubricating oil during use.

[0009] The refrigerant oil of the present application adds polyamide ester into base oil, and the action principle of the polyamide ester dispersant is mainly based on the interaction of the amide group in the molecular structure with the surface of the nano ceramic coating particles. When the polyamide ester dispersant is added to the system containing particles, the molecules will quickly adsorb to the surface of the particles to form a protective film. This protective film can effectively reduce the friction and agglomeration between the particles, thereby realizing the uniform dispersion of the particles. At the same time, the polyamide ester dispersant can also form a chemical bond with the surface of the particles, further enhancing the dispersion stability of the particles.

[0010] One preferred scheme is that the base oil comprises polyol ester lubricating oil (POE).

[0011] A further scheme is that the polyol ester lubricating oil is pentaerythritol isooctanoate isononanoate.

[0012] A further scheme is that the ratio of isooctanoic acid to isononanoic acid in the pentaerythritol isooctanoate isononanoate is 30%:70% to 50%:50%.

[0013] One preferred scheme is that the content of silicon oxide is 0.2%, the content of titanium oxide is 0.3%, and the content of magnesium oxide is 0.5%.

[0014] A further scheme is that the nano ceramic coating is coated on the outer peripheral wall of the roller and / or the end wall of the sliding vane by a thermal spraying method.

[0015] Therefore, the stability of the combination of the nano ceramic coating with the roller and / or the sliding vane is ensured. The thermal spraying method can be flame spraying, arc spraying, plasma spraying or supersonic flame spraying, etc.

[0016] It is a preferred embodiment that the base material of at least one of the roller and the sliding sheet is an iron-based powder metallurgical part or cast iron.

[0017] To achieve the above third object, the present application provides a refrigeration apparatus including the above compressor. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 is a sectional view of an embodiment of the compressor of the present application.

[0019] The present application will be further described by the following drawings and examples. DETAILED DESCRIPTION

[0020] Various exemplary embodiments of the present application will now be described in detail with reference to the accompanying drawings. The description of the exemplary embodiments is only meant to be illustrative and not limiting of the present application, its applications or uses. The present application can be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. These embodiments are provided so that this disclosure will be thorough and complete, and fully convey the scope of the application to those skilled in the art. It should be noted that the relative arrangement of components and steps, the numerical expressions, and the numerical values set forth in these embodiments are to be interpreted as merely exemplary and not limiting.

[0021] The terms "first", "second", and similar terms used in the present application do not denote any order, quantity, or importance, but are used to distinguish different parts. The terms "include" or "comprise" and similar terms mean that the elements before the word encompass the elements listed after the word, and do not exclude the possibility of also encompassing other elements.

[0022] All terms used in the present application, including technical or scientific terms, have the same meanings as those understood by those skilled in the art, unless otherwise specifically defined. It should also be understood that the terms defined in commonly used dictionaries should be interpreted as having a meaning that is consistent with their meanings in the context of the relevant art, and should not be interpreted in an idealized or overly formal sense, unless otherwise specifically defined herein.

[0023] Techniques, methods, and equipment known to those skilled in the relevant art can not be discussed in detail, but should be considered as part of the specification where appropriate.

[0024] Reference Figure 1The refrigeration equipment comprises a compressor 1, the compressor 1 is a rotor compressor, the compressor 1 comprises a cylinder body 2, a crankshaft 3, a sliding vane 4 and a roller 5, a crescent-shaped cylinder chamber 21 is arranged in the cylinder body 2, the roller 5, the sliding vane 4 and an eccentric part 31 of the crankshaft 3 are all located in the cylinder chamber 21, the roller 5 is installed on the eccentric part 31, a sliding vane groove 22 is arranged on the cylinder body 2, the sliding vane groove 22 extends along the radial direction of the cylinder body 2, the sliding vane 4 is arranged in the sliding vane groove 22, the sliding vane 4 is in sliding fit with the sliding vane groove 22 and can reciprocate in the sliding vane groove 22 along the extension direction of the sliding vane groove 22, the sliding vane 4 is abutted against and tightly contacts with the outer peripheral wall of the roller 5 by the action force of a spring 7, so as to divide the cylinder chamber into two parts, the volume of each part changes with the rotation angle of the roller 5, and the pressure of the gas in each part changes with the volume of the elementary volume, so that the working process of the compressor is completed. The bottom of the cylinder chamber 21 is provided with refrigeration oil, which is used for lubricating each component during the operation of the compressor.

[0025] The base material of at least one of the roller 5 and the sliding vane 4 is an iron-based powder metallurgy piece or cast iron, and a nano ceramic coating 6 is arranged on at least one of the outer peripheral wall of the roller 5 and the end wall of the sliding vane 4. In the embodiment, the nano ceramic coating 6 is arranged on both the outer peripheral wall of the roller 5 and the end wall of the sliding vane 4, and the nano ceramic coating 6 is coated on the outer peripheral wall of the roller 5 and the end wall of the sliding vane 4 by a thermal spraying method, so as to ensure the stability of the combination of the nano ceramic coating 6 and the roller 5 and the combination of the nano ceramic coating 6 and the sliding vane 4. The thermal spraying method can be flame spraying, arc spraying, plasma spraying or supersonic flame spraying, etc.

[0026] In the material for forming the nano ceramic coating 6, the content of zirconium oxide is 80% to 90% by weight, the content of aluminum oxide is 9% to 20% by weight, the content of silicon oxide is 0 to 1% by weight, the content of titanium oxide is 0 to 1% by weight, and the content of magnesium oxide is 0 to 1% by weight.

[0027] During the operation of the compressor 1, the roller 5 rolls along the inner wall of the cylinder body 2 in the cylinder chamber 21, and friction and wear are prone to occur between the outer peripheral wall of the roller 5 and the end wall of the sliding vane 4. By arranging the nano ceramic coating 6, the friction coefficient between the roller 5 and the sliding vane 4 can be significantly reduced, for example, the above-mentioned friction coefficient can be reduced to less than 0.05, so that the friction and wear of the roller 5 and the sliding vane 4 can be significantly reduced, the performance and energy efficiency of the rotor compressor 1 can be improved, the noise generated by friction of the rotor compressor 1 can be reduced, and the service life of the rotor compressor 1 can be prolonged.

[0028] The refrigerant oil of the embodiment includes base oil and additives, the additives including polyamide ester, the content of the polyamide ester accounting for 3% to 5% of the refrigerant oil in terms of percentage by weight. The base oil includes polyol ester lubricating oil (POE). The polyol ester lubricating oil is pentaerythritol isooctanoate isononanoate, which is a pentaerythritol fatty acid ester synthesized by esterification of a mixture of isooctanoic acid and isononanoic acid with pentaerythritol, and the ratio of isooctanoic acid to isononanoic acid in the pentaerythritol isooctanoate isononanoate is 30:70 to 50:50.

[0029] Embodiment 1

[0030] In the embodiment, the composition of the nanoceramic coating material includes 85% of zirconium oxide, 14% of aluminum oxide, 0.2% of silicon oxide, 0.3% of titanium oxide, and 0.5% of magnesium oxide in terms of percentage by weight. The base material of the roller and the slide is gray cast iron. The refrigerant oil is composed of base oil and additives, the base oil being polyol ester lubricating oil, the composition being pentaerythritol isooctanoate isononanoate, the ratio of isooctanoic acid to isononanoic acid being 50:50, and the additives being polyamide ester. The content of the base oil is 97% and the content of the polyamide ester is 3% in terms of percentage by weight.

[0031] Embodiment 2

[0032] In the embodiment, the composition of the nanoceramic coating material includes 80% of zirconium oxide, 19% of aluminum oxide, 0.2% of silicon oxide, 0.3% of titanium oxide, and 0.5% of magnesium oxide in terms of percentage by weight. The base material of the roller and the slide is gray cast iron. The refrigerant oil is composed of base oil and additives, the base oil being polyol ester lubricating oil, the composition being pentaerythritol isooctanoate isononanoate, the ratio of isooctanoic acid to isononanoic acid being 50:50, and the additives being polyamide ester. The content of the base oil is 97% and the content of the polyamide ester is 3% in terms of percentage by weight.

[0033] Embodiment 3

[0034] In the embodiment, the composition of the nanoceramic coating material includes 85% of zirconium oxide, 14% of aluminum oxide, 0.2% of silicon oxide, 0.3% of titanium oxide, and 0.5% of magnesium oxide in terms of percentage by weight. The base material of the roller and the slide is gray cast iron. The refrigerant oil is composed of base oil and additives, the base oil being polyol ester lubricating oil, the composition being pentaerythritol isooctanoate isononanoate, the ratio of isooctanoic acid to isononanoic acid being 50:50, and the additives being polyamide ester. The content of the base oil is 95% and the content of the polyamide ester is 5% in terms of percentage by weight.

[0035] Embodiment 4

[0036] In the present embodiment, the composition of the nanoceramic coating material includes 90% zirconium oxide, 9% aluminum oxide, 0.2% silicon oxide, 0.3% titanium oxide, and 0.5% magnesium oxide, in terms of weight percentage. The base material of the roller and the sliding sheet is gray cast iron. The refrigeration oil is composed of a base oil and an additive. The base oil is a polyol ester lubricating oil, and the composition is pentaerythritol isooctanoate isononanoate, in which the ratio of isooctanoic acid to isononanoic acid is 50:50%. The additive is a polyamide ester. The content of the base oil is 95% and the content of the polyamide ester is 5%, in terms of weight percentage.

[0037] Comparative Example 1

[0038] In the present comparative example, the base material of the roller and the sliding sheet is gray cast iron, and the refrigeration oil is a polyalkyl glycol oil (PAG).

[0039] Comparative Example 2

[0040] In the present comparative example, the composition of the nanoceramic coating material includes 85% zirconium oxide, 14% aluminum oxide, 0.2% silicon oxide, 0.3% titanium oxide, and 0.5% magnesium oxide, in terms of weight percentage. The base material of the roller and the sliding sheet is gray cast iron. The refrigeration oil is composed of a base oil. The base oil is a polyol ester lubricating oil, and the composition is pentaerythritol isooctanoate isononanoate, in which the ratio of isooctanoic acid to isononanoic acid is 50:50%. The mass percentage of the base oil is 100%.

[0041] Performance test method:

[0042] Friction and wear test: Falex block-on-ring friction tests were performed on each of the examples and comparative examples. The test conditions were as follows: load, 100 lbf; refrigerant pressure, 1.0 MPa; refrigerant type, R32; rotation speed, 800 rpm; and test time, 60 min.

[0043] Nanoceramic coating wear and particle size analysis: The refrigeration oil after the friction and wear test of each of the examples and comparative examples was collected, and the particle size of the particulate matter in the refrigeration oil was characterized after standing for 144 h. The nanometer particle size characterization experiment was performed using a Malvern nanometer particle size laser analyzer, model Mastersizer 3000E super-speed multipurpose laser particle size analyzer. The experimental results are shown in Table 1.

[0044] Table 1: Experimental results of performance test

[0045]

[0046] From the above table, it can be seen that in the scheme of Comparative Example 1, no nano ceramic coating is provided, the friction coefficient and the wear scar width increase, and the particle size has exceeded the upper limit of detection. After comparing the experimental results of each example and Comparative Example 2, it can be seen that in the scheme of Comparative Example 2, no polyamide ester dispersant is added, and the particle size analysis increases. After comparing the experimental results of each example and Comparative Example, it can be seen that the nano ceramic coating can better reduce the friction coefficient and the wear scar width, and improve the reliability. At the same time, from the average particle size and the maximum particle size, the polyamide ester dispersant can well reduce the particle size in the lubricating oil and prevent agglomeration.

[0047] As can be seen from the above, although the nano ceramic coating can greatly reduce the friction and wear of the roller and the sliding sheet, a small amount of particle wear still inevitably occurs, leading to the shedding of nano ceramic coating particles. The inorganic nano ceramic particles have poor oil solubility, high surface energy and small particle size, and are easy to agglomerate to form large particles in the refrigeration oil after shedding in the wear process, thereby further aggravating the wear of the rotor compressor and affecting the use of the rotor compressor. However, the existing refrigeration oil cannot effectively disperse the nano particles in the lubricating oil during use.

[0048] The refrigeration oil of the present application adds polyamide ester to the base oil. The principle of the polyamide ester dispersant is mainly based on the interaction of the amide group in its molecular structure with the surface of the substrate particles. When the polyamide ester dispersant is added to the system containing particles, its molecules will quickly adsorb to the surface of the particles to form a protective film. This protective film can effectively reduce the friction and agglomeration between particles, thereby achieving uniform dispersion of the particles. At the same time, the polyamide ester dispersant can also form a chemical bond with the surface of the particles, further enhancing the dispersion stability of the particles.

[0049] Finally, it should be emphasized that the above is only a preferred embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application can have various changes and modifications, and any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A compressor, comprising a cylinder body, a crankshaft, a vane, and rollers, wherein a cylinder chamber is provided within the cylinder body, the rollers, the vane, and the eccentric portion of the crankshaft are all located within the cylinder chamber, the rollers are mounted on the eccentric portion, the vane abuts against the outer peripheral wall of the rollers, and refrigerant oil is provided at the bottom of the cylinder chamber; At least one of the outer peripheral wall of the roller and the end wall of the slide is provided with a nano-ceramic coating to reduce the coefficient of friction between the roller and the slide. Its features are: In the material used to form the nano-ceramic coating, the content of zirconium oxide is 80% to 90%, the content of aluminum oxide is 9% to 19%, the content of silicon oxide is 0.2% to 1%, the content of titanium oxide is 0.3% to 1%, and the content of magnesium oxide is 0.5% to 1% by weight. The refrigeration oil is composed of base oil and additives, wherein the additives are polyamide esters, and the content of the polyamide esters in the refrigeration oil is 3% to 5% by weight. During the operation of the compressor, the polyamide ester will be adsorbed onto the surface of the detached nano-ceramic coating particles to form a protective film, effectively reducing friction and agglomeration between particles.

2. The compressor according to claim 1, characterized in that: The base oil includes polyol ester lubricating oil.

3. The compressor according to claim 2, characterized in that: The polyol ester lubricant is pentaerythritol isooctanoate.

4. The compressor according to claim 3, characterized in that: The ratio of isooctanoic acid to isononanoic acid in the pentaerythritol isooctanoic acid is 30%:70% to 50%:50%.

5. The compressor according to any one of claims 1 to 4, characterized in that: The content of silicon dioxide is 0.2%, the content of titanium dioxide is 0.3%, and the content of magnesium oxide is 0.5%.

6. The compressor according to any one of claims 1 to 4, characterized in that: The nano-ceramic coating is applied to the outer peripheral wall of the roller and / or the end wall of the slide by thermal spraying.

7. The compressor according to any one of claims 1 to 4, characterized in that: The substrate of at least one of the roller and the slide is an iron-based powder metallurgy part or cast iron.

8. A refrigeration device, characterized in that, Includes the compressor as described in any one of claims 1 to 7.

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