Compressor rear end cover coating and compressor rear end cover

Abstract

The utility model provides a compressor rear end cover coating and a compressor rear end cover, and belongs to the technical field of compressors. The compressor rear end cover coating comprises a bottom layer bonding layer and an insulating layer, the bottom layer bonding layer is attached to a compressor rear end cover, the insulating layer is arranged on the bottom layer bonding layer, and the insulating layer comprises PEEK paint. The coating is good in adhesive force and excellent in insulating property, and can meet the use requirements of the compressor.

Description

Technical Field

[0001] This utility model relates to the field of compressor technology, and in particular to a compressor rear end cover coating and compressor rear end cover. Background Technology

[0002] The rear end cover is a critical component of a centrifugal compressor, and its performance significantly impacts the compressor's operational stability. During centrifugal compressor operation, the motor shaft rotates at high speed and carries an electric current. Since the rear end cover is fitted to the motor shaft, it requires insulation. If the rear end cover is not insulated, the current could be conducted through it to other compressor components or the casing. This not only poses a serious threat to operator safety but could also cause electrical faults such as short circuits, affecting the compressor's normal operation and even damaging the equipment. For example, in some industrial production scenarios, operators who accidentally touch a live rear end cover could suffer electric shock.

[0003] Early industry practice involved using epoxy resin and fiberglass to create the insulation layer for the compressor's rear end cover. While this met insulation requirements to some extent, its manufacturing cost was high. This not only increased the overall cost of the product but also put significant pressure on companies in market competition, limiting the product's market promotion and application scope. Later, some manufacturers experimented with spraying Teflon coatings onto the surface of 45# steel as the insulation layer. Although this solution improved costs, the insulation layer was prone to breakdown in actual use. This seriously affected the electrical safety of the centrifugal compressor, potentially leading to electrical failures and reducing equipment reliability and lifespan. Furthermore, the Teflon coating had poor adhesion, posing a risk of peeling. Once the coating peeled off, it not only further reduced insulation performance but could also expose the metal substrate, causing corrosion and other problems, affecting the compressor's normal operation, and increasing maintenance costs and downtime.

[0004] Therefore, it is urgent to improve the insulation layer of the existing compressor rear cover to overcome the shortcomings of the existing technology. Utility Model Content

[0005] To overcome the problems existing in related technologies, one of the objectives of this utility model is to provide a coating for the rear end cover of a compressor. This coating has good adhesion and excellent insulation properties, which can meet the usage requirements of the compressor.

[0006] A compressor rear end cover coating, comprising:

[0007] The compressor includes a base adhesive layer and an insulating layer. The base adhesive layer is attached to the rear end cover of the compressor, and the insulating layer is disposed on the base adhesive layer. The insulating layer includes a PEEK coating.

[0008] The coating strengthens the bond between the underlying adhesive layer and the metal material of the compressor's rear end cover. The insulating PEEK coating is sprayed over the adhesive layer. PEEK itself has excellent adhesion, and during the subsequent curing process, it further fuses with the adhesive layer to form a tight bond. This ensures good adhesion between the entire coating and the compressor's rear end cover, reducing the risk of coating peeling and extending the coating's lifespan. PEEK material itself has excellent insulation properties, with insulation close to infinity. The dense insulating layer structure formed by the PEEK coating effectively blocks current flow, providing reliable insulation protection for the compressor's rear end cover and preventing problems such as leakage and short circuits caused by poor insulation performance of the rear end cover.

[0009] In a preferred embodiment of this invention, the surface of the insulating layer is further covered with a wear-resistant layer.

[0010] The wear-resistant layer acts as a protective barrier for the insulation layer. When faced with friction, impact, or other stresses, the wear-resistant layer absorbs the external force first, preventing direct damage to the insulation layer. This not only maintains the integrity of the insulation layer but also ensures its stable insulation performance, reducing safety hazards such as leakage and short circuits caused by insulation damage, and further improving the reliability and stability of the compressor operation.

[0011] In a preferred embodiment of this invention, the thickness of the bottom adhesive layer is 50μm-100μm, the thickness of the insulating layer is 50μm-250μm, and the thickness of the wear-resistant layer is 10μm-60μm.

[0012] A 50μm-100μm thick base adhesive layer can create a robust bond between the compressor rear end cover and the insulation layer. This thickness range is sufficient to cover microscopic defects on the rear end cover surface, forming a continuous and uniform adhesion layer that enhances the bonding strength between the coating and the metal material of the rear end cover.

[0013] The lower limit of 50μm for the insulation layer ensures basic insulation function and meets general electrical safety requirements; the upper limit of 250μm takes into account cost and structural compactness, avoiding excessive thickness that would increase material costs, affect heat dissipation of the rear cover, and affect the overall size.

[0014] The wear-resistant layer thickness of 10μm-60μm effectively improves the wear resistance of the rear end cover surface.

[0015] In a preferred embodiment of this invention, the surface of the bottom adhesive layer is sandblasted to form a sandblasted layer, wherein the particle size of the sand particles is 80-120 mesh, and the surface roughness Ra of the sandblasted layer is 3μm-6μm.

[0016] Sandblasting the surface of the underlayer adhesive layer with 80-120 mesh abrasive creates a micro-uneven structure. The relatively coarse abrasive particles produce larger protrusions and depressions, significantly increasing the contact area between the subsequent insulation layer and the underlayer adhesive layer, thereby improving the adhesion of the insulation layer.

[0017] In a preferred embodiment of this invention, the surface of the bottom adhesive layer is provided with a micropore array, the micropore array comprising a plurality of micropores, the micropores having a diameter of 50μm-100μm and a depth of 10μm-20μm.

[0018] The presence of the microporous array significantly increases the contact area between the underlying adhesive layer and the insulating layer. When the insulating material fills these micropores, it acts like countless tiny "anchor points," tightly connecting the two layers together. Compared to ordinary planar bonding, this bonding method with a microporous array significantly improves the mechanical interlocking force between the two layers, thereby enhancing their adhesion strength.

[0019] In a preferred embodiment of this invention, a transition layer is provided between the bottom adhesive layer and the insulating layer, and the transition layer comprises a silane coupling agent and nano-SiO2.

[0020] The presence of a transition layer improves the interface between the underlying adhesive layer and the insulating layer, making it easier for the insulating material to spread and adhere evenly to the surface of the underlying adhesive layer. Silane coupling agents reduce surface tension and improve the wettability of the coating, while nano-SiO2 modulates the rheological properties of the coating, contributing to the formation of a uniform and smooth coating. This reduces coating defects and improves the quality and appearance of the coating.

[0021] The second objective of this utility model is to provide a compressor rear end cover, including a substrate, on which the compressor rear end cover coating as described above is provided.

[0022] In a preferred embodiment of this invention, the base includes a base, a sleeve is provided on the base, a mounting through hole is provided on the base, and a connecting central hole is provided on the sleeve. The connecting central hole is used to cooperate with the motor spindle of the compressor, providing precise positioning and reliable support for the motor spindle, ensuring stability of the motor spindle during high-speed rotation, reducing vibration and noise, and improving the operating efficiency and reliability of the compressor.

[0023] In a preferred embodiment of this invention, the surface of the substrate is provided with a plurality of heat dissipation fins, the thickness of the heat dissipation fins is 0.5-1mm, and the spacing between two adjacent heat dissipation fins is 2mm-4mm.

[0024] The heat dissipation fins significantly increase the heat dissipation area of ​​the substrate. When the compressor generates heat, the heat can be quickly conducted to the heat dissipation fins and dissipated through air convection, thus maintaining the stability of the entire rear end cover structure.

[0025] The K coating is then dried, sintered, and cured to form an insulating layer on the surface of the underlying adhesive layer.

[0026] The beneficial effects of this utility model are as follows:

[0027] This utility model provides a compressor rear end cover coating, which includes a base adhesive layer and an insulating layer. The base adhesive layer is attached to the compressor rear end cover, and the insulating layer, comprising PEEK coating, is disposed on the base adhesive layer. The coating strengthens the bond between the coating and the metal material of the compressor rear end cover through the enhanced adhesion of the base adhesive layer. The PEEK coating of the insulating layer is sprayed on top of the base adhesive layer. PEEK itself has excellent adhesion, and during subsequent curing, it further fuses with the base adhesive layer to form a tight bond structure. This ensures good adhesion between the entire coating and the compressor rear end cover, reducing the risk of coating peeling and extending the coating's service life. PEEK material itself has excellent insulation properties, with insulation close to infinity. The dense insulating layer structure formed by the PEEK coating effectively blocks current flow, providing reliable insulation protection for the compressor rear end cover. This prevents leakage and short circuits caused by poor insulation performance of the rear end cover during compressor operation, ensuring safe and stable compressor operation, extending compressor service life, and meeting the compressor's usage requirements in various electrical environments.

[0028] This application also provides a compressor rear end cover and its manufacturing method. The compressor rear end cover is provided with the coating as described above, which makes the entire rear end cover have excellent insulation performance, thereby avoiding problems such as leakage and short circuit caused by poor insulation performance of the rear end cover, and ensuring the safe and stable operation of the compressor. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the coating on the rear end cover of the compressor provided in an embodiment of this utility model;

[0030] Figure 2 This is a schematic diagram of the compressor rear end cover provided in an embodiment of this utility model.

[0031] Figure 3 This is a flowchart of a method for manufacturing a compressor rear end cover coating provided in an embodiment of this utility model.

[0032] Figure label:

[0033] 1. Substrate; 11. Base; 111. Mounting through hole; 12. Sleeve; 121. Connecting center hole; 2. Heat dissipation fins; 3. Coating; 31. Underlying adhesive layer; 32. Insulation; 33. Wear-resistant layer; 34. Sandblasting layer; Detailed Implementation

[0034] Preferred embodiments of the present invention will now be described in more detail with reference to the accompanying drawings. While preferred embodiments of the present invention are shown in the drawings, it should be understood that the present invention may be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that the present invention will be thorough and complete, and will fully convey the scope of the present invention to those skilled in the art.

[0035] The rear end cover is a critical component of a centrifugal compressor, and its performance significantly impacts the compressor's operational stability. During centrifugal compressor operation, the motor shaft rotates at high speed and carries an electric current. Since the rear end cover is fitted to the motor shaft, it requires insulation. If the rear end cover is not insulated, the current could be conducted through it to other compressor components or the casing. This not only poses a serious threat to operator safety but could also cause electrical faults such as short circuits, affecting the compressor's normal operation and even damaging the equipment. For example, in some industrial production scenarios, operators who accidentally touch a live rear end cover could suffer electric shock.

[0036] Early industry practice involved using epoxy resin and fiberglass to create the insulation layer for the compressor's rear end cover. While this met insulation requirements to some extent, its manufacturing cost was high. This not only increased the overall cost of the product but also put significant pressure on companies in market competition, limiting the product's market promotion and application scope. Later, some manufacturers experimented with spraying Teflon coatings onto the surface of 45# steel as the insulation layer. Although this solution improved costs, the insulation layer was prone to breakdown in actual use. This seriously affected the electrical safety of the centrifugal compressor, potentially leading to electrical failures and reducing equipment reliability and lifespan. Furthermore, the Teflon coating had poor adhesion, posing a risk of peeling. Once the coating peeled off, it not only further reduced insulation performance but could also expose the metal substrate, causing corrosion and other problems, affecting the compressor's normal operation, and increasing maintenance costs and downtime.

[0037] Based on this, this application provides a coating for the rear end cover of a compressor.

[0038] Example 1

[0039] like Figure 1 As shown, this embodiment provides a compressor rear end cover coating, comprising:

[0040] The bottom adhesive layer 31 and the insulating layer 32 are attached to the rear end cover of the compressor. The insulating layer 32 is disposed on the bottom adhesive layer 31 and includes a PEEK coating.

[0041] In one embodiment, after the compressor rear end cover is manufactured, its surface is cleaned to remove oil, dust, and other impurities. A base layer adhesive is evenly sprayed onto the rear end cover surface using a spray gun, with the spray gun pressure controlled at 0.3-0.4 MPa, ensuring a uniform adhesive coating thickness of approximately 30-50 μm. After spraying, the rear end cover is placed in a drying device and dried at 80-100°C for 15-20 minutes to allow the base layer adhesive to initially cure, enhancing its adhesion to the rear end cover. After the base layer adhesive layer 31 cools to room temperature, the rear end cover surface is cleaned again to remove any dust or other impurities. PEEK coating is poured into the spray gun, the spray gun pressure is adjusted to 0.4-0.6 MPa, and the distance between the spray gun and the rear end cover surface is controlled at 10-12 cm, evenly spraying the PEEK coating to form an insulating layer 32.

[0042] Specifically, the PEEK coating of this application includes PEEK material and polytetrafluoroethylene (PTFE). PTFE can improve the performance of the PEEK coating to achieve the purpose of balancing the insulation and mechanical strength of the insulation layer.

[0043] The aforementioned compressor rear end cover coating 3 strengthens the bond between the coating and the metal material of the compressor rear end cover through the reinforcement of the underlying adhesive layer 31. The PEEK coating, forming the insulating layer 32, is sprayed onto the underlying adhesive layer 31. PEEK itself has excellent adhesion, and during subsequent curing, it further fuses with the underlying adhesive layer 31 to form a tight bond structure. This ensures good adhesion between the entire coating 3 and the compressor rear end cover, reducing the risk of coating 3 peeling off and extending the service life of the coating 3. PEEK material itself has excellent insulation properties, approaching infinity. The dense insulating layer structure formed by the PEEK coating effectively blocks current flow, providing reliable insulation protection for the compressor rear end cover and preventing problems such as leakage and short circuits caused by poor insulation performance of the rear end cover.

[0044] In this embodiment, the thickness of the bottom adhesive layer 31 is 50μm-100μm, the thickness of the insulating layer 32 is 50μm-250μm, and the thickness of the wear-resistant layer 33 is 10μm-60μm.

[0045] A bottom adhesive layer 31 with a thickness of 50μm-100μm can establish a stable connection between the compressor rear end cover and the insulation layer 32. This thickness range is sufficient to cover microscopic defects on the surface of the rear end cover, forming a continuous and uniform adhesion layer, enhancing the bonding force between the coating 3 and the metal material of the rear end cover. If it is too thin, it is difficult to fully exert the adhesive effect, which can easily lead to the coating 3 falling off; if it is too thick, it may generate internal stress, which will also affect the bonding stability. The appropriate thickness ensures that the insulation layer 32 and the wear-resistant layer 33 can adhere firmly during the long-term operation of the compressor, even under conditions such as vibration and temperature changes, maintaining the structural integrity of the coating 3.

[0046] An insulation layer thickness of 50μm-250μm strikes a balance between insulation performance and overall structural optimization. The lower limit of 50μm ensures basic insulation functionality, meeting general electrical safety requirements; the upper limit of 250μm considers cost and structural compactness, avoiding excessive thickness that increases material costs, affects heat dissipation from the rear cover, and impacts overall dimensions. For complex operating conditions involving high voltage and strong electromagnetic interference, a thickness closer to the upper limit provides more reliable insulation protection, preventing current leakage and electrical faults, and ensuring the safe and stable operation of the compressor.

[0047] A wear-resistant layer thickness of 10μm-60μm effectively improves the wear resistance of the rear end cover surface. A 10μm thickness can resist minor friction and wear to a certain extent, reducing surface damage; a 60μm thickness can withstand more severe wear environments, such as gas erosion containing hard particles and frequent mechanical contact. This thickness protects the insulation layer from mechanical damage and maintains its insulation performance, without compromising the overall structural strength and heat dissipation performance of the rear end cover due to excessive thickness. This ensures that the rear end cover surface remains in good condition under various operating conditions, extending the service life of the rear end cover.

[0048] Specifically, the surface of the insulating layer 32 is also covered with a wear-resistant layer 33.

[0049] Specifically, the wear-resistant layer 33 of this application is made of a high-performance wear-resistant material, such as tungsten carbide-based wear-resistant coating. This wear-resistant coating is added to a spray gun, and the spray gun pressure is adjusted to 0.45 MPa. The wear-resistant layer 33 is then uniformly sprayed onto the surface of the insulation layer 32, with a thickness controlled at 80 μm. After spraying, the rear end cap is placed in a drying oven and dried at 100°C for 40 minutes to allow the wear-resistant layer 33 to cure and form a tight seal on the surface of the insulation layer 32.

[0050] The wear-resistant layer 33 acts as a protective barrier for the insulation layer 32. During long-term operation, the surface of the rear end cover inevitably experiences various frictions, such as slight friction with surrounding components and erosion from dust particles. With the wear-resistant layer 33 applied, the tungsten carbide-based wear-resistant coating, due to its high hardness and excellent wear resistance, effectively resists these frictions, reduces wear on the rear end cover surface, and extends the service life of the rear end cover. Compared to a rear end cover without the wear-resistant layer 33, under the same operating environment and time, the wear on the surface of the rear end cover with the wear-resistant layer 33 is significantly reduced, better maintaining its original shape and performance.

[0051] Furthermore, the thickness of the bottom adhesive layer 31 is 50μm-100μm, the thickness of the insulating layer 32 is 50μm-250μm, and the thickness of the wear-resistant layer 33 is 10μm-60μm.

[0052] A 50μm-100μm thick bottom adhesive layer 31 can create a strong connection between the compressor rear end cover and the insulation layer 32. This thickness range is sufficient to cover microscopic defects on the surface of the rear end cover, forming a continuous and uniform adhesion layer, and enhancing the adhesion between the coating 3 and the metal material of the rear end cover.

[0053] The lower limit of 50μm for 32 insulation layers ensures basic insulation 32 functionality and meets general electrical safety requirements; the upper limit of 250μm takes into account cost and structural compactness, avoiding excessive thickness that would increase material costs, affect heat dissipation of the rear cover, and affect the overall size.

[0054] The 10μm-60μm wear-resistant layer thickness of 33 effectively improves the wear resistance of the rear end cover surface.

[0055] Example 2

[0056] This embodiment is an improvement on embodiment 1.

[0057] like Figure 1 As shown, in this embodiment, the surface of the bottom adhesive layer 31 is sandblasted to form a sandblasted layer 34, wherein the particle size of the sand is 80-120 mesh, and the surface roughness Ra of the sandblasted layer 34 is 3μm-6μm.

[0058] Sandblasting the surface of the underlayer adhesive layer 31 with 80-120 mesh abrasive creates a micro-uneven structure. During spraying, the insulating layer 32 material penetrates better into this uneven structure, forming a mechanical anchoring effect. This interwoven structure enhances the bond between the underlayer adhesive layer 31 and the insulating layer 32, ensuring that the insulating layer 32 will not separate from the underlayer adhesive layer 31 due to external forces during long-term use. This guarantees the integrity of the entire coating system 3 and maintains good insulation performance.

[0059] Furthermore, the presence of the sandblasting layer 34 alters the surface properties of the underlying adhesive layer 31, resulting in a more uniform stress distribution within the coating system 3. Under external forces, the sandblasting layer 34 acts as a buffer, reducing stress concentration. This contributes to improving the overall fatigue resistance of the coating 3 and extending its service life. In addition, appropriate surface roughness can improve the wettability of the coating 3 surface, allowing subsequent coating materials to spread and adhere more evenly, further optimizing the performance of the coating 3, such as improving its smoothness and reducing defects.

[0060] Example 3

[0061] This embodiment is an improvement on embodiment 1.

[0062] like Figure 1 As shown, in this embodiment, the surface of the bottom adhesive layer 31 is provided with a micropore array, the micropore array including multiple micropores, the pore diameter of the micropores being 50μm-100μm and the depth being 10μm-20μm.

[0063] The presence of the microporous array significantly increases the contact area between the bottom adhesive layer 31 and the insulating layer 32. When the insulating layer 32 material fills these micropores, it acts like countless tiny "anchor points," tightly connecting the two layers together. Compared to ordinary planar bonding, this bonding method with a microporous array significantly improves the mechanical interlocking force between the two layers, thereby enhancing their adhesion strength.

[0064] Specifically, a micropore array can be fabricated on the surface of the bottom adhesive layer 31 using a specific process. For example, laser processing technology can be used to control the laser parameters and fabricate micropores with a diameter of 50μm-100μm and a depth of 10μm-20μm on the surface of the bottom adhesive layer 31.

[0065] In a specific embodiment, the micropore array of this application can be a honeycomb texture with a pore spacing / pore diameter ratio of 1:1.5. Compared with the planar surface of the bottom adhesive layer 31, this structure can improve the adhesion between the insulating layer 32 and the bottom adhesive layer 31 by 15%-20%.

[0066] Example 4

[0067] This embodiment is an improvement on embodiment 1.

[0068] like Figure 1As shown, in this embodiment, a transition layer is provided between the bottom adhesive layer 31 and the insulating layer 32. The transition layer comprises a silane coupling agent and nano-SiO2. In this embodiment, the silane coupling agent is dissolved in a suitable solvent (such as ethanol) to form a solution of a certain concentration (e.g., 5%-10%). Then, nano-SiO2 is added to the solution, and the nano-SiO2 is uniformly dispersed in the solution by methods such as ultrasonic dispersion to form the transition layer solution. After the bottom adhesive layer 31 cools to room temperature, the transition layer solution is coated onto the surface of the bottom adhesive layer 31 by spraying or dipping. During the coating process, attention should be paid to controlling the coating speed and uniformity to ensure that the thickness of the transition layer is uniform. After coating, the solution is left at room temperature for a period of time to allow the solvent to evaporate.

[0069] The PEEK coating is then evenly sprayed onto the transition layer surface using a spraying device. During spraying, the pressure, flow rate, and spray pattern of the spray gun are adjusted to ensure that the coating can evenly cover the transition layer.

[0070] The presence of the transition layer improves the interface state between the bottom adhesive layer 31 and the insulating layer 32, making it easier for the insulating layer 32 material to spread and adhere evenly on the surface of the bottom adhesive layer 31. The silane coupling agent reduces surface tension and improves the wettability of the coating, while nano-SiO2 modulates the rheological properties of the coating, contributing to the formation of a uniform and smooth coating 3. This reduces defects in the coating 3 and improves its quality and appearance.

[0071] Example 5

[0072] like Figures 1-2 As shown, this embodiment of a compressor rear end cover includes a substrate 1, on which the compressor rear end cover coating as described above is provided.

[0073] In this embodiment, the base 1 includes a base 11, a sleeve 12 is provided on the base 11, a mounting through hole 111 is provided on the base 11, and a connecting central hole 121 is provided on the sleeve 12. The mounting through hole 111 on the base 11 allows the compressor rear end cover to be securely installed on the compressor body. The precise size and positional accuracy of the through hole ensure the correct connection and assembly of the rear end cover with other compressor components, avoiding loosening and displacement caused by improper installation. During compressor operation, the rear end cover can withstand various mechanical stresses and vibrations, maintaining structural stability and ensuring the reliable operation of the entire compressor system.

[0074] The sleeve 12 and connecting hole 121 on the base 11 provide precise positioning and reliable support for the compressor motor spindle. The high-precision machining of the connecting hole ensures a tight fit with the motor spindle, effectively reducing radial and axial displacement during high-speed rotation and maintaining stable spindle operation. This not only reduces vibration and noise generation and minimizes environmental impact but also improves compressor operating efficiency. Stable spindle operation reduces energy loss, increases the compressor's compression ratio and efficiency, thereby reducing energy consumption and improving economic benefits.

[0075] In this embodiment, the surface of the substrate 1 is provided with multiple heat dissipation fins 2, the thickness of the heat dissipation fins 2 is 0.5-1mm, and the spacing between two adjacent heat dissipation fins 2 is 2mm-4mm.

[0076] The placement of heat dissipation fins 2 significantly increases the heat dissipation area of ​​the base 1. When the compressor generates heat, the heat can be quickly conducted from the base 1 to the heat dissipation fins 2 and dissipated through air convection. This large-area heat dissipation method enables the rear cover to dissipate heat effectively and promptly, reducing its temperature and preventing material performance degradation and structural deformation caused by excessive temperature.

[0077] Example 6

[0078] This embodiment provides a method for manufacturing a compressor rear end cover as described above, the manufacturing method comprising the following steps:

[0079] like Figures 1-3 As shown, S100 is used to prepare substrate 1;

[0080] The base 1 is made of a metallic material with good thermal conductivity and mechanical properties, such as aluminum alloy 6061. This material is not only lightweight but also has high strength and corrosion resistance, making it suitable for the working environment of the compressor rear end cover. The base 1 can be cast using a mold. The cast base 1 is then machined. Using a CNC machining center, mounting through holes 111 are precisely machined on the base 11, with the diameter tolerance controlled within ±0.05mm and the surface roughness reaching Ra1.6μm. A connecting central hole 121 is machined on the sleeve 12, with the dimensional accuracy of the central hole ensuring a fit tolerance with the compressor motor spindle within ±0.03mm and a cylindricity error not exceeding 0.01mm, to ensure that the motor spindle can smoothly pass through the rear end cover, achieving precise positioning and reliable support.

[0081] S200, Spray the base adhesive layer 31 onto the substrate 1;

[0082] The surface of substrate 1 is degreased, derusted, and roughened. Oil stains on the surface of substrate 1 are removed using a degreaser, and then the surface is roughened by sandpaper or sandblasting to improve the adhesion of coating 3.

[0083] S300. The surface of the bottom adhesive layer 31 is sandblasted.

[0084] S400. Apply PEEK coating to the sandblasted bottom adhesive layer 31, then dry and sinter to cure, so that an insulating layer 32 is formed on the surface of the bottom adhesive layer 31.

[0085] After the overall manufacturing is completed, a base adhesive layer 31, a transition layer, an insulating layer 32, and a wear-resistant layer 33 are sequentially coated. The thickness of the base adhesive layer 31 is controlled at 50-100 μm, and it is cured by baking at 120-150℃ for 30-60 minutes after coating. The transition layer uses a mixed solution of silane coupling agent and nano-SiO2, and is dried at room temperature for 2-4 hours after coating. The insulating layer 32 uses PEEK coating with a thickness controlled at 50-250 μm, and is sintered at 350-400℃ for 1-2 hours after coating. The wear-resistant layer 33 has a thickness controlled at 10-60 μm, and is cured at 150-200℃ for 1-2 hours after coating. Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps described in these embodiments do not limit the scope of this application. It should also be understood that, for ease of description, the dimensions of the various parts shown in the accompanying drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following figures denote similar items; therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures. In the description of this application, it should be understood that directional terms such as "front, back, up, down, left, right," "lateral, vertical, horizontal," and "top, bottom," etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the figures, and are only for the convenience of describing this application and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as limiting the scope of protection of this application; the directional terms "inner" and "outer" refer to the inner or outer contours relative to the outline of each component itself.

[0086] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0087] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, these terms have no special meaning and therefore should not be construed as limiting the scope of protection of this application. The above description is only a preferred embodiment of this utility model and is not intended to limit this utility model. For those skilled in the art, this utility model can have various modifications and variations. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the scope of protection of this utility model.

Claims

1. A compressor back end cover coating, characterized by, include: The compressor includes a base adhesive layer and an insulating layer. The base adhesive layer is attached to the rear end cover of the compressor, and the insulating layer is disposed on the base adhesive layer. The insulating layer includes a PEEK coating.

2. The compressor rear end cover coating according to claim 1, characterized in that: The surface of the insulating layer is also covered with a wear-resistant layer.

3. The compressor rear end cover coating according to claim 2, characterized in that: The thickness of the bottom adhesive layer is 50μm-100μm, the thickness of the insulating layer is 50μm-250μm, and the thickness of the wear-resistant layer is 10μm-60μm.

4. The compressor rear end cover coating according to any one of claims 1-3, characterized in that: The surface of the bottom adhesive layer is sandblasted to form a sandblasted layer, wherein the particle size of the sand is 80-120 mesh, and the surface roughness Ra of the sandblasted layer is 3μm-6μm.

5. The compressor rear end cover coating according to any one of claims 1-3, characterized in that: The surface of the bottom adhesive layer is provided with a micropore array, which includes multiple micropores with a diameter of 50μm-100μm and a depth of 10μm-20μm.

6. The compressor rear end cover coating according to any one of claims 1-3, characterized in that: A transition layer is provided between the bottom adhesive layer and the insulating layer.

7. A compressor back end cover comprising a base body, characterized in that: The substrate is provided with a compressor rear end cover coating as described in any one of claims 1-6.

8. A compressor rear end cover according to claim 7, characterized in that: The base includes a base, a sleeve is provided on the base, an installation through hole is provided on the base, and a connection center hole is provided on the sleeve.

9. A compressor rear end cover according to claim 7, characterized in that: The surface of the substrate is provided with multiple heat dissipation fins, the thickness of the heat dissipation fins is 0.5-1mm, and the spacing between two adjacent heat dissipation fins is 2mm-4mm.

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